JP2023130574A - Disposable pants-type wear - Google Patents

Abstract

To provide a back side barrier that automatically rises and fits.SOLUTION: A back side barrier 70 includes a first part 71 fixed to the back B over the whole in a width direction WD, a second part 72 extending forward from the front edge of the first part 71, and a third part 73 folded back rearward from the front edge of the second part 72 and extending rearward. A part positioned in the middle of the width direction WD of the back side barrier 70 is a high rising part 81 where the second part 72 and the third part 73 rise from the surface of the back B, A part positioned on the two lateral sides of the high rising part 81 of the back side barrier 70 is a low rising part 82 where the second part 72 does not rise, and the third part 73 rises. A slender barrier elastic member 74 is attached to at least the rear end part of the third part 73 over the high rising part 81 and the low rising part 82.SELECTED DRAWING: Figure 5

Description

TECHNICAL FIELD The present invention relates to a pants-type disposable wearing article having a function of preventing back leakage.

Pants-type disposable diapers, pant-type sanitary products, and other pants-type disposable wearing articles have widthwise elasticity around the waist, making it difficult to create a gap between the wearer's back and the diaper. A situation in which excrement such as urine leaks out (so-called back leakage) is less likely to occur.

For example, a typical pants-type disposable diaper includes an exterior body that forms at least the waist area of the front body and the waist area of the back body, and an absorbent body attached to the exterior body from the front body to the back body. A waist opening and a pair of left and right leg openings are formed by joining both side edges of the front body exterior body and both side edges of the rear body body exterior body to form a side seal. This is what is being done. The exterior body is provided with an elastic member in the waist circumference area defined as the front-rear range (range from the waist opening to the upper end of the leg openings) in the front-rear direction with side seals, thereby adding elasticity in the width direction. has been done. As the elastic member, in addition to those using an elongated elastic member such as a rubber thread, there are also known ones using an elastic film. (For example, see Patent Documents 1 and 2).

Furthermore, in order to further improve the prevention of back leakage, it has been proposed to provide a back barrier even in pants-type disposable wearing articles (for example, see Patent Document 1).

However, in conventional pants-type disposable wearing articles equipped with a back barrier, the back barrier may be used in a collapsed state. In other words, the dorsal barrier is not only installed in a flat state during manufacturing and pressurized in the thickness direction, but also pressurized in the thickness direction until it is used afterwards. As a result, even when the product is used, the rising portion may remain weakly attached to the opposing surface in a fallen state. Therefore, if the device is used without being aware of this situation, there is a risk that the leakage prevention function will be insufficient, and it is desirable to raise the dorsal barrier once before use.

Japanese Patent Application Publication No. 2001-252303 Japanese Patent Application Publication No. 2013-75106

Therefore, the main object of the present invention is to provide a pants-type disposable wearing article in which the back barrier automatically rises to fit the wearer.

The pants-type disposable wearing article that solved the above problems is as follows.
<First aspect>
An integral exterior body extending from the front body to the back body, or an exterior body provided separately on the front body and the back body,
an interior body attached to the middle of the exterior body in the width direction so as to extend from the front body through the crotch region to the back body;
a pair of side seals formed by joining both sides of the exterior body in the front body and both sides of the exterior body in the back body, respectively;
a waist opening formed by the front edge of the front body and the rear edge of the back body;
leg openings provided on both sides of the interior body,
A dorsal barrier having a portion that rises inwardly extends in the width direction from one side seal to the other side seal on the waist opening side of the crotch area in the rear body,
The dorsal barrier has a first part fixed to the back body, a second part extending forward from the front edge of the first part, and a front edge of the second part over its entire width direction. and a third portion extending rearward by being folded back from
In the part of the back barrier located in the middle in the width direction, the back surface of the second part and the surface of the back body are not joined throughout, and the surface of the second part and the surface of the third part are not joined together. It has a high rising part that is not joined to the back side throughout,
In the portions of the backside barrier located on both sides of the high rise portion, at least the front end portion of the back surface of the second portion and the surface of the back body are joined over the entirety, and The front surface and the back surface of the third portion are not joined throughout and are a low rising portion,
An elongated barrier elastic member is attached to at least the rear end portion of the third portion along the width direction from one of the low rising portions to the high rising portion and extending across the other low rising portion;
The portion of the third portion including the barrier elastic member is elastically contracted in the width direction together with the barrier elastic member in a natural length state, and is elastically expandable in the width direction.
A pants-type disposable wearing article characterized by:

(effect)
In this pants-type disposable article, when worn, the third part of the dorsal barrier rises up along the skin and comes into close contact with the skin, thereby suppressing the gap between the back body and the body surface and preventing leakage. can. In particular, the dorsal barrier has a high rise part where the second and third parts rise (in other words, the height at which it can rise is relatively high) in the middle of the width direction where gaps are likely to occur. , on both sides thereof, the second part does not rise and only the third part rises (in other words, the height at which it can rise is low) is a low rising part. The high rise portion has a high height at which it can rise, so it has excellent leak prevention properties, but it is also relatively easy to move. On the other hand, although the low rise portion has poor leak prevention properties, its folded state is easily maintained. Therefore, if the entire width of the dorsal barrier has a high rising portion, when the article is put on or worn, the third portion may partially fall down to the front side, resulting in an undesirable situation such as worsening the wearing feeling. There is a risk that On the other hand, when low rise parts are continuous on both sides of a high rise part like in the real product, the folded state of the high rise parts is also maintained due to the effect of maintaining the folded state of the low rise parts. It becomes like this.

<Second aspect>
The dimension of the second portion in the front-rear direction is 10 to 30 mm,
The second portion is not provided with an elastic member,
The dimension in the front-rear direction of the third portion is 0.5 to 1.5 times the dimension in the front-rear direction of the second portion,
A plurality of the barrier elastic members are provided in the third portion at intervals in the front-rear direction,
No elastic member is provided within 5 mm from the boundary with the second portion in the third portion,
The elongation rate of the third portion at maximum elongation in the width direction is 200 to 300%.
A pants-type disposable wearing article according to the first aspect.

(effect)
The dimensions of each part of the dorsal barrier can be determined as appropriate, but it is preferable that the dimensions are within the range of this embodiment because the high rising part of the third part rises more closely to the skin and makes it easier to make contact with the surface.

<Third aspect>
The inner body has an absorbent body extending from the front side of the crotch region to the first portion,
An end on the center side in the width direction of the low rise portion is located on both ends in the width direction of the absorbent body.
The pants-type disposable wearing article according to the first or second aspect.

(effect)
If the width of the high rise part is unnecessarily wide, or if the low rise part that maintains the shape of the high rise part is easily deformed, there is a high risk that the high rise part will become unfavorable due to the deformation that occurs during wear. . In contrast, in this embodiment, the low rise portion extends to a portion having a relatively rigid absorbent body, and becomes a high rise portion from there, so that the shape maintenance effect of the low rise portion is enhanced, and the As a result, the shape-maintaining effect of the high rising portion is also enhanced.

<Fourth aspect>
Elongated elastic members along the width direction are attached adjacent to at least both front and rear sides of the third portion in the range in the front and back direction including the side seal in the exterior body,
A region of the exterior body having the elastic member is elastically contracted in the width direction together with the elastic member of the exterior body in a state of natural length, and can be elastically expanded in the width direction;
The barrier elastic member and the elastic member of the exterior body are elastic members having the same thickness and the same elastic modulus attached at the same elongation rate,
The pants-type disposable wearing article according to any one of the first to third aspects.

(effect)
Pants-type disposable wearing articles generally have an elastic member along the width direction in the waist region of the exterior body. In this case, if the feeling of tightness due to the barrier elastic member is different from the feeling of tightening due to the elastic members of the exterior body located in the vicinity of the front and rear of the barrier elastic member, there is a risk of causing a sense of discomfort. Therefore, as in this embodiment, the barrier elastic member and the elastic members of the exterior body in the vicinity of the front and rear of the barrier elastic member are attached with elastic members having the same thickness and the same elastic modulus at the same elongation rate to make it difficult to feel discomfort. is preferable.

As described above, according to the present invention, advantages such as the ability of the dorsal barrier to automatically rise and fit 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. 2 is a sectional view taken along line 6-6 in FIG. 1; FIG. 2 is a perspective view showing a main part of the inner surface of the pants-type disposable diaper. FIG. 2 is a schematic diagram showing a cross section of the back barrier viewed from near the crotch side to the waist opening side. (a) A schematic diagram of a vertical cross section in a high rising portion, and (b) a schematic diagram of a vertical cross section in a low rising portion. (a) A sectional view of another example corresponding to the 4-4 section in FIG. 1, and (b) a sectional view of another example corresponding to the 5-5 section in FIG. 1.

Hereinafter, a pants-type disposable diaper will be explained in detail as an example of a pants-type disposable wearing article with reference to the accompanying drawings. The constituent members adjacent in the thickness direction are fixed or joined as necessary in the same manner as in known diapers, except for the fixing or joining portions described below. The dotted portion in the cross-sectional view indicates an adhesive such as a hot melt adhesive as the fixing or joining means. Hot melt adhesives can be applied by known methods such as slot coating, continuous line or dotted bead coating, spiral, Z-shaped, wavy, etc. spray coating, or pattern coating (transfer of hot melt adhesive using a letterpress method). It can be applied by any method. Alternatively or additionally, at the fixed portion of the elastic member, a hot melt adhesive can be applied to the outer circumferential surface of the elastic member to secure the elastic member to the adjacent member. Examples of hot melt adhesives include EVA adhesives, adhesive rubber adhesives (elastomer adhesives), polyolefin adhesives, and polyester/polyamide adhesives, which can be used without particular limitation. As the fixing or joining means for joining each component, means for welding materials such as heat sealing or ultrasonic sealing can also be used. In areas where liquid permeability in the thickness direction is required, constituent members adjacent in the thickness direction are fixed or bonded in an intermittent pattern. For example, when such intermittent fixing or bonding is performed using hot melt adhesive, intermittent pattern coating such as spiral, Z-shaped, or wavy patterns can be suitably used, and the coating can be applied over an area larger than the coating width with one nozzle. When coating, intermittent pattern coating such as a spiral, Z-shaped, wavy pattern, etc. can be performed with or without intervals in the width direction. As a joining means for joining each component, means by material welding such as heat sealing or ultrasonic sealing can also be used.

Furthermore, as the nonwoven fabric in the following 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, polyolefins such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide (including monocomponent fibers as well as composite fibers such as core-sheath fibers), as well as recycled 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 (including SMS nonwoven fabrics with a meltblown layer sandwiched between spunbond layers, SMMS nonwoven fabrics, etc.), and any of these nonwoven fabrics can be used.

1 to 6 show a pants-type disposable diaper. This pants type disposable diaper has an annular waist region T formed by joining both sides of the front body F and both sides of the back body B with side seals 12A, and a waist region T of the front body F. An intermediate region L extending from the torso region T of the back body B through the crotch region, a waist opening WO provided on the side opposite to the intermediate region L in the waist region T, and a waist opening WO provided on both sides of the intermediate region L in the width direction WD. It has a leg opening LO. In other words, the waist area T is defined as the area between the edge of the waist opening WO and the virtual straight line passing through the upper end of the leg opening LO and extending in the width direction, and the intermediate area L is the lower end of the side seal 12A of the front body F. and the lower end of the side seal 12A of the back body B in the front-rear direction LD. In the unfolded state shown in FIGS. 1 and 2, both side edges of the intermediate region L are constricted in a U-shape or a curved shape along the legs of the wearer, and the diaper as a whole has a substantially hourglass shape.

In addition, this pants-type disposable diaper has two main assemblies, namely, exterior bodies 12F and 12B that form at least the waist region T, and exterior bodies 12F and 12B that are attached to the exterior bodies 12F and 12B so as to extend from the front body F to the back body B. and an inner body 200. The opening formed by the front and rear ends of the exterior bodies 12F, 12B becomes the waist opening WO through which the wearer's torso passes, and the lower edges of the exterior bodies 12F, 12B and the side edges of the interior body 200 open on both sides of the interior body 200 in the width direction. Each surrounded portion becomes a leg opening LO through which the legs pass. 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 LD from the edge We of the waist opening WO of the front body F to the edge We of the waist opening WO of the back body B), and the symbol The full width of the diaper in the unfolded state is shown.

(Interior body)
Although the interior body 200 can take any shape, it is rectangular in the illustrated form. 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 an assembly that performs the absorption function. Reference numeral 40 indicates an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid that has permeated through the top sheet 30 to the absorbent element 50; 2 shows riser gathers 60 extending from both sides of the interior body 200 so as to come into contact with the wearer's legs in order to prevent excrement from leaking to both sides of the interior body 200.

(Top sheet)
The top sheet 30 has the property of permeating liquid, and may be, for example, a perforated or non-perforated nonwoven fabric, a perforated plastic sheet, or 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 absorber 56 and to prevent the absorbed liquid from returning from the absorber 56, an intermediate material having a higher liquid permeation speed than the top sheet 30 is used. A seat (also referred to as a "second seat") 40 may be provided. 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 17 to 50 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 polyolefin 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 a polyolefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching it uniaxially or biaxially. is widely used. In addition, non-woven fabrics using microdenier fibers, non-woven fabrics with increased leak-proofing properties by reducing the fiber pores by applying heat or pressure, coatings with super absorbent resins or hydrophobic resins, and water repellent agents are also available. A sheet made liquid-impermeable without using a plastic film can also be used as the liquid-impermeable sheet 11 by a method such as a plastic film, but it is not sufficient when bonding with a cover nonwoven fabric 13 via a hot melt adhesive to be described later. In order to obtain sufficient adhesive strength, 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.

(get up and 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. The rising gathers 60 can be omitted if necessary.

The rising gathers 60 (so-called three-dimensional gathers) shown in FIGS. 1, 3, and 4 stand up from the sides of the interior body 200 toward the front side. The rising gathers 60 has a base portion 60B that stands up obliquely toward the center in the width direction, and a tip end portion 60A that stands up obliquely toward the outside of the width direction from the middle portion, but is not limited to this. It is possible to make appropriate changes, such as a configuration in which the entire configuration stands up on the center side in the width direction.

To explain in more detail, the raised gathers 60 in the illustrated example is made by folding a band-shaped gathered nonwoven fabric 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. The proximal end portion of the rising gathers 60 located on the opposite side to the tip portion (the end portion on the opposite side to the sheet folded portion in the width direction WD) is fixed to the side portion of the interior body 200 on the back side of the liquid-impermeable sheet 11. A portion other than the root portion 65 is a main body portion 66 (a 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. Although this form is a surface contact type rising gathers 60, a line contact type rising gathers 60 that is not folded back outward in the width direction may also be adopted. 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 free portion 68 in an extended state.

In the rising gathers 60 configured as described above, the contractile force of the gather elastic member 63 acts to bring the front and rear ends closer together, but the main body portion 66 is fixed so that the front and rear ends do not stand up. On the other hand, since there is an unfixed free portion 68 between them, only the free portion 68 stands up so as to come into contact with the body side as shown by the arrow in FIG. In particular, when the root portion 65 is located on the back side of the interior body 200, the free portion 68 stands up in the crotch area and its vicinity so as to open outward in the width direction, so that the rising gathers 60 come into contact with the area around the legs. This will improve the fit.

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 this embodiment, the tip end portion 60A and the base portion 60B are joined to the top sheet 30 in a laid down state at the laid down portion 67, and the base 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, one preferable embodiment is to bond the base portion 60B and the top sheet 30 using a hot melt adhesive, and to bond the tip portion 60A and the base portion 60B to each other by material welding.

The gathered nonwoven fabric 62 is a flexible nonwoven fabric with excellent uniformity and concealment properties such as spunbond nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.), melt-blown nonwoven fabric, and if necessary, water repellent with silicone etc. Treated fibers can be suitably used, and the fiber basis weight 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 during fixation is preferably 150 to 350%, more preferably 200 to 300%. Furthermore, as shown in the figure, a waterproof film 64 can be interposed between the gathered nonwoven fabric 62 folded in two, and in this case, the gathered nonwoven fabric 62 can be partially omitted in the area where the waterproof film 64 is present. However, in order to make the product look and feel like cloth, it is necessary that at least the outer surface of the rising gathers 60 from the base end to the tip is formed of the gathered nonwoven fabric 62, as shown in the illustrated example. be.

The number of gather elastic members 63 provided in the free portion of the rising gathers 60 is preferably 2 to 6, more preferably 3 to 5. A suitable arrangement interval 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 free portion 68 of the rising gathers 60, hot melt adhesive, heat sealing, or ultrasonic application using various coating methods is used to bond the inner and outer layers of the gathered nonwoven fabric 62 and to fix the gathered 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 gathered nonwoven fabric 62 are bonded together, the flexibility will be impaired, so it is preferable that the portions of the gathered 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 circumferential 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 layer and the outer layer of the gathered nonwoven fabric 62. The structure is such that the gathered elastic member 63 can be fixed to the inner layer and outer layer of the gathered nonwoven fabric 62 and the inner layer and outer layer of the gathered nonwoven fabric 62 can be fixed using only the hot melt adhesive applied to the outer peripheral surface of the gathered nonwoven fabric 62. There is.

Similarly, for fixing the waterproof film 64 incorporated in the rising gathers 60 and the gather nonwoven fabric 62, and for fixing the collapsed portion 67, hot melt adhesives can be applied using various methods, and material welding can be performed using heat sealing, ultrasonic sealing, etc. At least one of the following methods can be used.

(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 may be omitted depending on the situation.

(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. I can do it. 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.

Further, the dimensions of the absorbent body 56 can be determined as appropriate as long as they extend to the front, back, left and right of the urinary opening position, but it is preferable that the absorber 56 extends to or near the peripheral edge of the interior body 200 in the front-rear direction LD and the width direction WD. . 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 on the sieve is 30% by weight or less, and when sieving (shaking for 5 minutes) using a 180 μm standard sieve (JIS Z8801-1:2006), the proportion of particles remaining on the sieve is 60% by weight or less. % by weight or more is desirable.

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.

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 .

(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 form 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, etc. It is preferable that the absorbent body is wound in a shape, with its front and rear edges protruding from the front and rear of the absorber 56, and the overlapping portions and the overlapping portions of the front and rear protruding portions are joined by a joining means such as hot melt adhesive or material welding.

(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 the liquid-impermeable sheet 11 is not exposed on the back side of the interior body 200. It is preferable that a cover nonwoven fabric 13 is provided to cover the back surface of the interior body 200 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 cover nonwoven fabric 13 is not particularly limited by the type of fiber or the method of binding (entangling) the fibers, and for example, the same one as the first sheet and second sheet of the exterior bodies 12F and 12B described later may be selected as appropriate. can do. As an example of the cover nonwoven fabric 13, an air-through nonwoven fabric can be suitably used, and in that case, the basis weight is preferably 20 to 40 g/m ² and the thickness is 0.3 to 1.0 mm. As the cover nonwoven fabric 13, a nonporous nonwoven fabric having no holes penetrating the front and back sides may be used, or a perforated nonwoven fabric having a large number of holes penetrating the front and back sides at intervals may be used.

The range of the cover nonwoven fabric 13 in the front-rear direction is not particularly limited, and as shown in FIGS. 2 and 5, it may extend in the front-rear direction LD over the entire interior body 200 from the front end to the rear end, and as shown in FIG. As shown, it extends in the longitudinal direction LD from a longitudinally intermediate position of the region where the front exterior body 12F and the interior body 200 overlap to a longitudinally intermediate position of the region where the rear exterior body 12B and the interior body 200 overlap. Good too. In addition, in the case of the example shown in FIG. 7, the length 13y in the longitudinal direction of the overlapping portion between the cover nonwoven fabric 13 and the front exterior body 12F, and the longitudinal length 13y of the overlapped portion between the cover nonwoven fabric 13 and the rear exterior body 12B are The length can be set as appropriate, but in normal cases, each can be about 20 to 40 mm.

The widthwise range of the cover nonwoven fabric 13 is such that the exposed backside portion of the liquid-impermeable sheet 11 can be hidden. Therefore, in the illustrated example, the liquid-impermeable sheet 11 is exposed between the base ends of the right and left rising gathers 60, so that from the back side of the base end of at least one rising gather 60 to the base end of the other rising gather 60. A cover nonwoven fabric 13 is provided so as to cover the widthwise range up to the back side of the section. Thereby, the liquid-impermeable sheet 11 can be hidden by the cover nonwoven fabric 13 and the gathered nonwoven fabric 62 of the raised gathers 60. Further, even if the gather nonwoven fabric 62 covers the back side of both widthwise ends of the cover nonwoven fabric 13 instead of the cover nonwoven fabric 13 rising up to cover the back side of the proximal end of the gathers 60, the cover nonwoven fabric 13 It is possible to hide the liquid-impermeable sheet 11 with the gathered nonwoven fabric 62. In this case, since both sides of the cover nonwoven fabric 13 are covered with the gathered nonwoven fabric 62, there is an advantage that both sides of the cover nonwoven fabric 13 are difficult to peel off from the liquid-impermeable sheet 11.

The inner and outer surfaces of the cover nonwoven fabric 13 can be adhered to opposing surfaces, respectively, via a hot melt adhesive. The fixed area of the cover nonwoven fabric 13 may be the entire front-to-back direction and the entire width direction of the cover nonwoven fabric 13, or a part of the cover nonwoven fabric 13 may be unfixed. For example, if both ends of the cover nonwoven fabric 13 in the width direction are not fixed, even if the sides of the absorbent body 56 are somewhat contracted due to the influence of the rising gathers 60, they will not be affected easily, and the cover nonwoven fabric 13 will be wrinkled or folded. This has the advantage of being less likely to be In this case, the width of the non-fixed portions at both ends of the cover nonwoven fabric 13 in the width direction may be determined as appropriate, and may be, for example, 3 to 10 mm, preferably 5 to 8 mm.

(Inner body fixing part)
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 interior body fixing parts 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 the interior body 200 and the exterior bodies 12F and 12B overlap, for example, in the width direction of the interior body 200. It can also be provided in parts other than both ends.

(exterior body)
The illustrated exterior bodies 12F and 12B are composed of a rectangular front exterior body 12F that forms a waist area T of the front body F, and a rectangular rear exterior body 12B that forms a waist area T 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. This separation distance 12d can be, for example, about 0.4 to 0.5 times the total length Y. 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 area.

The portion of the exterior body 12F, 12B located in the waist circumference region T can be divided into a waist portion W forming an end on the side of the waist opening WO, and a lower waist portion U that is a portion below this. . If the portion of the exterior body 12F, 12B located in the waist circumference region T has a boundary where the elastic force in the width direction WD changes (for example, the thickness or elongation rate of the elastic member changes), the part located closest to the waist opening WO The waist opening WO side from the located boundary becomes the waist part W, and if there is no such boundary, the waist extension part 12E extending from the absorber 56 or the inner body 200 to the waist opening WO side becomes the waist part W. . These lengths in the front and back direction LD vary depending on the size of the product and can be determined as appropriate; for example, the waist portion W can be 15 to 40 mm, and the lower waist portion U can be 65 to 120 mm.

In addition, in the illustrated example, the front exterior body 12F and the rear exterior body 12B have the same dimensions in the front-rear direction LD, and each does not have a portion located in the intermediate region L, but as shown by the two-dot chain line in FIG. , the rear exterior body 12B has a longer longitudinal dimension than the front exterior body 12F, and the front exterior body 12F does not have a portion located in the intermediate region L, but the rear exterior body 12B has a region around the waist. It may have a buttock cover portion C extending from T toward the intermediate region L side. Although not shown, the front exterior body 12F may also be provided with an inguinal cover portion extending from the waist region T to the intermediate region L side, or may be provided with an inguinal cover portion but not provided with a buttock cover portion.

The exterior bodies 12F, 12B have elastic members 15, 17 built-in in order to improve the fit around the wearer's waist, and an elastic region A2 that elastically expands and contracts in the width direction WD as the elastic members 15, 17 expand and contract. is formed. In this elastic region A2, in the natural length state, the folds are contracted in the width direction WD together with the elastic members 15 and 17, and folds are formed, and in the worn state in which the elastic members 15 and 17 are stretched in the width direction WD, the folds widen and there are no folds. It is possible to expand up to a predetermined expansion rate. As the elastic members 15 and 17, known elongated elastic members such as thread-like or band-like elastic members can be used without particular limitation. The elastic members 15 and 17 may be made of synthetic rubber or natural rubber.

To explain the elastic members 15 and 17 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%. The distance between the waist elastic members 17 in the front-rear direction LD may be constant or may vary in the middle of the front-rear direction LD.

Further, it is preferable that a plurality of waist lower elastic members 15 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 member 15 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 5 to 30 rubber threads (about ² ) at intervals 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%, especially 240%. It is preferably about 300%. The distance between the lower waist elastic members 15 in the front-rear direction LD may be constant, or may vary in the middle of the front-rear direction LD as shown in the illustrated example.

When the lower waist elastic member 15 is provided in the front-rear direction range including the absorber 56, as in the lower waist part U of the illustrated example, in order to prevent the absorber 56 from shrinking in the width direction WD in part or all of it. In addition, the widthwise intermediate portion including part or all of the portion overlapping with the absorbent body 56 in the width direction WD (preferably including the entire inner body fixing portions 201 and 202) is defined as a non-stretchable region A1, and both sides of the widthwise side thereof are This is the elastic area A2. Although it is preferable that the waist portion W has an elastic region A2 over the entire width direction WD, similarly to the lower waist portion U, a non-elastic region A1 may be provided in the middle in the width direction.

Such stretchable region A2 and non-stretchable region A1 are created by fixing the elastic member 15 when manufacturing the exterior bodies 12F and 12B, and then applying pressure and heat to the lower waist elastic member 15 in the region that will become the non-stretchable region A1. It can be constructed by cutting at one point in the middle in the width direction or by cutting into pieces at multiple points, leaving elasticity in the elastic region A2 and eliminating elasticity in the non-stretchable region A1. In these cases, cut pieces 16 and the like of the elastic member that do not substantially contribute to expansion and contraction will remain in the exterior bodies 12F and 12B in the non-stretchable region A1.

(Laminated structure of exterior body)
In the example shown in FIG. 5, the waist portion W includes an outer portion 18 in which a first sheet 12S made of a nonwoven fabric or the like and a second sheet 12H made of a nonwoven fabric or the like are laminated, and at least the first sheet 12S is located at the edge We of the waist opening WO. The inner part 19 is joined to the outer part 18 via a hot melt adhesive HM (which may be welded). In the example shown in FIG. 5, the first sheet 12S and the second sheet 12H of the outer portion 18 extend from the waist portion W to the lower waist portion U (in the illustrated example, over the entire waist region T); The present invention is not limited to this, and appropriate changes can be made, such as forming the lower waist portion U with a separate sheet. Further, in the front body F in the example shown in FIG. The first sheet 12S extends only to the middle of the waist part W in the front-rear direction LD, and the first sheet 12S extends from the waist part W to the lower waist part U and covers the end of the interior body 200 on the waist opening WO side. However, the present invention is not limited to this, and for example, both the first sheet 12S and the second sheet 12H may extend to the lower waist portion U, or both the first sheet 12S and the second sheet 12H may fit within the waist portion W. Alternatively, it may extend only to the side of the waist opening WO from the inner body 200, and may not cover the end of the inner body 200. Further, like the rear body part B of the example shown in FIG. 5, the second sheet 12H of the front body part F exists only in the outer part 18 and does not need to extend to the inner part 19. Furthermore, unlike the illustrated example, it is not necessary to provide the inner portion 19 in at least one of the front body F and the back body B.

The materials for the first sheet 12S and the second sheet 12H can be determined as appropriate as long as they are nonwoven fabrics. For example, the first sheet 12S and the second sheet 12H may be made of synthetic fibers such as polyolefins such as polyethylene and polypropylene, polyesters, and polyamides, mixed fibers or composite fibers using two or more of these. Non-woven fabrics can be used. Examples of the fiber bonding method include an air-through method and a point bond method. The fineness, basis weight, and thickness of the nonwoven fabric used for the first sheet 12S and the second sheet 12H can be determined as appropriate. As an example, the nonwoven fabrics used for the first sheet 12S and the second sheet 12H are long fiber nonwoven fabrics with a fineness of 1.0 to 2.5 dtex, a basis weight of 10 to 30 g/m ² , and a thickness of 0.15 to 0.50 mm. and preferable.

In the example shown in FIG. 5, the waist elastic member 17 provided in the waist portion W is provided between the outer portion 18 and the inner portion 19, but the first sheet 12S and the first sheet 12S in the outer portion 18 or the inner portion 19 It may be provided between the two sheets 12H.

The lower waist elastic member 15 provided in the lower waist portion U is provided between the first sheet 12S and the second sheet 12H continuing from the outer portion 18, but is not limited to this, and is provided between other sheets. It can also be provided in between.

These elastic members 15 and 17 may be fixed at least at both ends of the elastic region A2 (that is, not only at both ends in the elastic direction), but also in a structure in which they are fixed throughout the entire elastic direction, or intermittently fixed in the elastic direction. ) and is fixed to at least one of the first sheet 12S and the second sheet 12H. Any known method can be used for this fixing. For example, the elastic members 15 and 17 can be fixed to the first sheet 12S and the second sheet 12H via a hot melt adhesive HM. The illustrated waist elastic member 17 employs this fixing structure. In addition to or in place of this, by sandwiching the elastic members 15, 17 between the welded parts of the first sheet 12S and the second sheet 12H, which are arranged at an interval narrower than the natural length of the elastic members 15, 17. , the elastic members 15 and 17 can also be fixed to the first sheet 12S and the second sheet 12H. In the latter case, the surfaces of the elastic members 15 and 17 can also be fixed to at least one of the first sheet 12S and the second sheet 12H while forming the welded portion. Furthermore, together with these, the elastic members 15 and 17 can also be welded to the first sheet 12S and the second sheet 12H together with the welding of the first sheet 12S and the second sheet 12H in the side seal 12A.

(dorsal barrier)
Characteristically, as shown in FIGS. 1, 5, and 8 to 11, on the side of the waist opening WO from the crotch area in the back body B, there is a dorsal side that has a part that rises inwardly (toward the body surface side). The barrier 70 extends in the width direction WD from one side seal 12A to the other side seal 12A. The back side barrier 70 includes a first portion 71 fixed to the rear body B, a second portion 72 extending forward from the front edge of the first portion 71, and a second portion 72 extending forward from the front edge of the first portion 71 over the entire width direction WD. It has a third part 73 that is folded back from the front edge of the part 72 and extends rearward, and a part of the back barrier 70 located in the middle in the width direction WD is connected to the back surface of the second part 72 and the back body B. The surface of the second portion 72 and the back surface of the third portion 73 are not joined throughout, forming a high rise portion 81, and the high rise portion of the dorsal barrier 70 is formed. In the portions located on both sides of the portion 81, at least the front end of the back surface of the second portion 72 and the surface of the back body B are joined over the entirety, and the surface of the second portion 72 and the back surface of the third portion 73 are joined together. and is a low rise portion 82 that is not joined throughout. Further, an elongated barrier elastic member 74 is attached to at least the rear end portion of the third portion 73 along the width direction WD so as to extend from one low rise portion 82 to the high rise portion 81 and the other low rise portion 82. The portion of the third portion 73 that includes the barrier elastic member 74 is elastically contracted in the width direction WD together with the barrier elastic member 74 in the natural length state, and can be elastically expanded in the width direction WD.

The symbol HM1 in the figure indicates a hot melt adhesive for fixing the first portion 71 to the back body B, and the symbol HM2 indicates a hot melt adhesive for fixing the second portion 72 in the low rise portion 82 to the back body B. Showing melt adhesive. The hot melt adhesive for fixing the second portion 72 of the low rise portion 82 to the back body B may be provided over almost the entire back surface of the second portion, but only on the front end of the back surface of the second portion. It is also possible to provide one.

It is preferable that the low rising portion 82 (in the illustrated example, the portion fixed by the hot melt adhesive HM2) extends over the entire region in the width direction WD between the high rising portion 81 and the side seal 12A as in the illustrated example. , a low rising portion 82 is provided only on the high rising portion 81 side than the middle in the width direction WD of the region between the high rising portion 81 and the side seal 12A, and the second portion 72 and the third portion are provided on the side seal 12A side. 73 may be fixed in a folded state (that is, the back surface of at least the front end of the second portion 72 and the surface of the back body B are joined over the entire width direction WD, and the second portion 72 and the back surface of at least the rear end portion of the third portion 73 may be joined over the entire width direction WD).

In this pants-type disposable wearing article, as shown in FIGS. 9 to 11, when worn, the third portion 73 of the back barrier 70 rises along the skin and comes into close contact with the skin, thereby connecting the back body B and the body surface. It is possible to prevent leakage by suppressing the gap between the In particular, as shown in FIGS. 10 and 11, the second portion 72 and the third portion 73 of the back barrier 70 rise in the middle of the width direction WD where gaps are likely to occur (that is, the height at which they can rise is relative to each other). On the other hand, on both sides of it, the second part 72 does not rise and only the third part 73 rises (in other words, the height at which it can be raised is low) is a low rise part 82. It has become. Since the high rising portion 81 has a high height at which it can rise, it has excellent leak prevention properties, but is relatively easy to move. On the other hand, although the low rise portion 82 has poor leak prevention properties, its folded state is easily maintained. Therefore, if the entire width direction WD of the back barrier 70 is the high rise portion 81, the third portion 73 may partially fall down to the front side when wearing or wearing the article, worsening the wearing feeling. This may lead to an undesirable situation. On the other hand, if the low rise portions 82 are continuous on both sides of the high rise portion 81 as in the real product, the folded state of the high rise portion 81 is maintained due to the action of maintaining the folded state of the low rise portions 82. will also be maintained.

The first portion 71, second portion 72, and third portion 73 of the back side barrier 70 can be formed by attaching a dedicated barrier sheet 75 to the back body B as shown in the example shown in FIG. It can also be formed using the inner portions 19 of the exterior bodies 12F and 12B as in the example shown in FIG. More specifically, in the dorsal barrier 70 of the example shown in FIG. 72 and a third portion 73 are formed, and a barrier elastic member 74 is fixed between the layers of the barrier sheet 75 in the third portion 73. The fixation of the barrier elastic member 74 to the barrier sheet 75 can be selected as appropriate in the same way as the fixation of the elastic members 15, 17 of the exterior bodies 12F, 12B described above. It is possible to adopt the same structure as , or it is possible to adopt a different fixing structure. The two-layer structure of the barrier sheet 75 only needs to be provided at least in the portion having the barrier elastic member 74. Therefore, in the illustrated example, the first portion 71 and the second portion 72 do not have to have a two-layer structure. good. Further, in the illustrated example, the first portion 71 of the barrier sheet 75 is folded back together with the outer bodies 12F, 12B at the edge of the waist opening WO and extends to the outer portion 18 of the outer bodies 12F, 12B, but the present invention is not limited to this. Instead, it may extend only to the inner portions 19 of the exterior bodies 12F, 12B, or may extend only to the crotch side of the inner portions 19 of the exterior bodies 12F, 12B.

In the structure shown in FIG. 12, a first portion 71, a second portion 72, and a third portion 73 are formed by the inner portions 19 of the exterior bodies 12F, 12B, and the first portion 71, the second portion 72, and the third portion 73 form the inner portions 19 of the exterior bodies 12F, 12B. One sheet 12S is folded in half with the tip of the third portion 73 as the folding position, and the first portion 71, the second portion 72, and the third portion 73 have a two-layer structure, and the interlayer of the barrier sheet 75 in the third portion 73 A barrier elastic member 74 is fixed to. The fixation of the barrier elastic member 74 to the barrier sheet 75 can be selected as appropriate in the same way as the fixation of the elastic members 15, 17 of the exterior bodies 12F, 12B described above. It is possible to adopt the same structure as , or it is possible to adopt a different fixing structure. The two-layer structure formed by the first sheet 12S only needs to be provided at least in the portion having the barrier elastic member 74. Therefore, in the illustrated example, the first portion 71 and the second portion 72 do not have a two-layer structure. Good too.

It is preferable that the third portion 73 is provided with a plurality of barrier elastic members 74 at intervals in the front-rear direction LD, particularly about 3 to 5 barrier elastic members 74, and the second portion 72 is provided with elastic members. However, it is preferable that it is not provided. The barrier elastic member is provided over the entire width of the high rising portion. On the other hand, as long as the barrier elastic member 74 is provided in most of the low rising portion 82 on the high rising portion 81 side, it is not provided up to the side edge of the low rising portion 82 (that is, over the entire width direction of the dorsal barrier). However, it does not have to be provided all the way to the side of the low rising portion 82.

The dimensions of each part of the back barrier 70 can be determined as appropriate. As an example, if the second portion 72 is not provided with an elastic member and the third portion 73 is provided with a plurality of barrier elastic members 74 at intervals in the front-rear direction LD, Preferably, the barrier elastic member 74 is not provided within 5 mm from the boundary with the two portions 72. As a result, the high rising portion 81 of the third portion 73 rises to more closely fit the skin and makes it easier to make contact with the surface. Further, in this case, the dimension of the second portion 72 in the longitudinal direction LD is preferably 10 to 30 mm, and the dimension of the third portion 73 in the longitudinal direction LD is 0.0 mm of the dimension of the second portion 72 in the longitudinal direction LD. It is preferably 5 to 1.5 times. The elongation rate of the third portion 73 at maximum elongation in the width direction WD is preferably 200 to 300%. Further, if the barrier elastic member 74 is not provided within 5 mm from the rear end (the tip of the dorsal barrier 70) of the third portion 73 and the layers of the two-layer structure are not joined, the dorsal barrier This is preferable because a hollow, flexible portion is formed at the tip of 70.

The position of each part of the back barrier 70 may be determined as appropriate, but it is preferable that the boundary 76 between the first part 71 and the second part 72 be located on the rear end of the absorbent body 56. Further, it is preferable that the end portions of the low rising portion 82 on the center side in the width direction WD are located on both ends of the absorber 56 in the width direction WD. If the width of the high rise portion 81 is unnecessarily wide or the low rise portion 82 that maintains the shape of the high rise portion 81 is easily deformed, the high rise portion 81 will be in an unfavorable state due to the deformation that occurs during wear. There is a high possibility that On the other hand, if the low rise portion 82 extends to a portion having the absorber 56 having relatively high rigidity and becomes the high rise portion 81 from there, the shape maintenance effect of the low rise portion 82 will be enhanced. As a result, the shape maintaining effect of the high raised portion 81 is also improved.

If the feeling of tightness caused by the barrier elastic member 74 differs from the feeling of tightness caused by the elastic members 15, 17 of the exterior bodies 12F, 12B (in the illustrated example, the lower waist elastic member 15) located in the front and near the front, it may cause a sense of discomfort. There is. Therefore, in this case, the barrier elastic member 74 and the elastic members 15, 17 of the exterior bodies 12F, 12B in the vicinity of the front and back thereof are attached with the same thickness and the same elastic modulus at the same elongation rate. It is preferable that it is a type of material because such a feeling of discomfort is less likely to occur.

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

- "Front side" means the side of the member that is closer to the wearer's skin when worn, and "back side" means the side farther from the wearer's skin when worn.

- "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.

・“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".

・The term "deployed state" means a state in which the product is flattened without contraction (including any contraction such as contraction caused by an elastic member) 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 for pants-type disposable wearing articles such as pants-type disposable diapers and pants-type sanitary products.

DESCRIPTION OF SYMBOLS 11... Liquid-impermeable sheet, 12A... Side seal, 12B... Rear side exterior body, 12E... Waist extension part, 12F, 12B... Exterior body, 12F... Front side exterior body, 12H... Second sheet, 12S... First Sheet, 13...Cover nonwoven fabric, 15, 17...Elastic member, 15...Waist lower elastic member, 17...Waist elastic member, 18...Outer portion, 19...Inner portion, 200...Interior body, 201, 202...Interior body fixing part , 30...Top sheet, 40...Intermediate sheet, 50...Absorbent element, 56...Absorber, 58...Wrapping sheet, 60...Rising gathers, 60A...Tip side part, 60B...Base side part, 62...Gathered nonwoven fabric, 67... Lodging portion, 68...Free portion, 70...Dorsal barrier, 71...First portion, 72...Second portion, 73...Third portion, 74...Barrier elastic member, 75...Barrier sheet, 81...High rising portion, 82 ...Low rising part, A1...Non-stretchable area, A2...Stretchable area, B...Back body, C...Buttock cover part, F...Front body, L...Middle area, LD...Anteroposterior direction, LO...Leg opening, T...Torso Surrounding area, U...lower waist area, W...waist area, WD...width direction, WO...waist opening.

Claims (4)

An integral exterior body extending from the front body to the back body, or an exterior body provided separately on the front body and the back body,
an interior body attached to the middle of the exterior body in the width direction so as to extend from the front body through the crotch region to the back body;
a pair of side seals formed by joining both sides of the exterior body in the front body and both sides of the exterior body in the back body, respectively;
a waist opening formed by the front edge of the front body and the rear edge of the back body;
leg openings provided on both sides of the interior body,
A dorsal barrier having a portion that rises inwardly extends in the width direction from one side seal to the other side seal on the waist opening side of the crotch area in the rear body,
The dorsal barrier has a first part fixed to the back body, a second part extending forward from the front edge of the first part, and a front edge of the second part over its entire width direction. and a third portion extending rearward by being folded back from
In the part of the back barrier located in the middle in the width direction, the back surface of the second part and the surface of the back body are not joined throughout, and the surface of the second part and the surface of the third part are not joined together. It has a high rising part that is not joined to the back side throughout,
In the portions of the backside barrier located on both sides of the high rise portion, at least the front end portion of the back surface of the second portion and the surface of the back body are joined over the entirety, and The front surface and the back surface of the third portion are not joined throughout and are a low rising portion,
An elongated barrier elastic member is attached to at least the rear end portion of the third portion along the width direction from one of the low rising portions to the high rising portion and extending across the other low rising portion;
The portion of the third portion including the barrier elastic member is elastically contracted in the width direction together with the barrier elastic member in a natural length state, and is elastically expandable in the width direction.
A pants-type disposable wearing article characterized by: The dimension of the second portion in the front-rear direction is 10 to 30 mm,
The second portion is not provided with an elastic member,
The dimension in the front-rear direction of the third portion is 0.5 to 1.5 times the dimension in the front-rear direction of the second portion,
A plurality of the barrier elastic members are provided in the third portion at intervals in the front-rear direction,
No elastic member is provided within 5 mm from the boundary with the second portion in the third portion,
The elongation rate of the third portion at maximum elongation in the width direction is 200 to 300%.
The pants-type disposable wearing article according to claim 1. The inner body has an absorbent body extending from the front side of the crotch region to the first portion,
An end on the center side in the width direction of the low rise portion is located on both ends in the width direction of the absorbent body.
The pants-type disposable wearing article according to claim 1 or 2. Elongated elastic members along the width direction are attached adjacent to at least both front and rear sides of the third portion in the range in the front and back direction including the side seal in the exterior body,
A region of the exterior body having the elastic member is elastically contracted in the width direction together with the elastic member of the exterior body in a state of natural length, and can be elastically expanded in the width direction;
The barrier elastic member and the elastic member of the exterior body are elastic members having the same thickness and the same elastic modulus attached at the same elongation rate,
The pants-type disposable wearing article according to any one of claims 1 to 3.

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