WO2022244401A1 - Pants-type disposable wearable article - Google Patents

Abstract

[Problem] To impart a good texture to an area near a waist opening and prevent displacement of a sheet. [Solution] A waist part W has an outer portion 18 in which a first sheet 12S and a second sheet 12H are laminated, and an inner portion 19 which is connected to the outer portion 18 and in which the first sheet 12S and the second sheet 12H extending from the external portion 18 are folded inward at the edge of a waist opening WO. The waist part W has a plurality of waist elastic members 17 between the outer portion 18 and the inner portion 19. The first sheet 12S and the second sheet 12H are thermally fused at a connection position 80 across the outer portion 18 and the inner portion 19 in the front-rear direction LD. In an inner edge region Ei near the waist opening WO in the inner portion 19, a strongly bonded portion 81 is disposed at one location, and at least one of a weakly bonded portion 82 and a non-bonded portion 83 is disposed in another area thereof. In a region extending from the inner edge region Ei, weakly bonded portions 82 are disposed periodically in the front-rear direction LD with non-bonded portions 83 therebetween.

Description

Pants type disposable wearing article

The present invention relates to a pants-type disposable wearing article with improved texture (softness, cushioning) at the end of the waist opening.

A pants-type disposable wearing article comprises an outer body that constitutes at least a waist circumference of a front body and a back body, and an inner body that is attached to the outer body so as to extend from the front body to the back body, and comprises an exterior of the front body. Generally, a waist opening and a pair of left and right leg openings are formed by joining both sides of the body and both sides of the outer body of the back body to form side seals (see, for example, Patent Document 1, 2).

In general pants-type disposable wearing articles, the region including the waist portion of the outer body has a laminated structure in which elastic members are interposed between a plurality of sheet layers in order to ensure fit to the body.

For pants-type disposable wearable articles, the texture (feel, feel, touch) of the end of the waist opening when holding or wearing the product when wearing or purchasing is very important.

Therefore, in the exterior body described in Patent Document 1, the outer portion in which the first sheet and the second sheet are laminated from the waist lower portion to the waist portion, and the first sheet and the second sheet continuing from the outer portion are the waist opening. and an inner portion formed by folding inwardly at the edge and extending over the entire waist portion of at least one of the sheets, and from the outer portion of the one sheet exposed to the outside to the inner portion via the edge of the waist opening. It is proposed that the leading part be a loose part that is not fixed to the other sheet. Due to the presence of such free portions, the flexibility and cushioning properties of the waist portion are improved, and good texture can be obtained.

However, if such a loose portion exists, when the first sheet and the second sheet are folded back to form the edge of the waist opening, the first sheet and the second sheet are misaligned to form unnecessary curls and wrinkles. something happened. Also, when the product is worn, there is a possibility that the fit of the waist portion may deteriorate due to the displacement of the first sheet and the second sheet.

JP 2016-067436 A WO2018/154684

Therefore, the main object of the present invention is to prevent the sheet from slipping while improving the texture of the waist opening and its vicinity.

A typical mode for solving the above problems is as follows.
<First Aspect>
An annular waist region formed by joining both sides of the front body and both sides of the back body, an intermediate region extending from the waist region of the front body to the waist region of the back body through the crotch portion, A waist opening provided on the opposite side of the intermediate region in the waist region, leg openings provided on both sides in the width direction of the intermediate region, an outer body forming at least the waist region, and a front body an inner body attached to the outer body so as to extend over the back body,
The exterior body has a waist portion defined as an end portion on the side of the waist opening,
The waist portion includes an outer portion in which a first sheet made of nonwoven fabric and a second sheet made of nonwoven fabric are laminated, and the first sheet and the second sheet continuing from the outer portion are folded inward at the edge of the waist opening. and at least one of the sheets has an inner portion formed extending across the waist portion,
said inner portion being joined to said outer portion;
the waist portion has a plurality of elongated waist elastic members spaced apart from each other along the width direction between the outer portion and the inner portion;
In the first sheet and the second sheet, a bonded position extending in the front-rear direction over the outer part and the inner part and a non-bonded position extending in the front-rear direction extending over the outer part and the inner part are alternately arranged in the width direction. provided repeatedly,
The first sheet and the second sheet are welded and joined at the joining position,
The outer portion has an outer edge area of 10 mm or less from the waist opening edge to the leg opening side, and the inner portion has an inner edge area of 10 mm or less from the waist opening edge to the leg opening side. death,
The outer portion of the waist portion has a first portion located on the waist opening side from the middle in the front-rear direction and including the outer edge region and a second portion located on the opposite side,
the waist portion has at least one waist elastic member at a position overlapping the first portion and the second portion;
In the joint positions over the outer edge region and the inner edge region, a strong joint portion having relatively high joint strength is arranged at one location, and weak joint portions having relatively low joint strength are arranged at other portions. At least one of the joint portion and the non-joint portion is arranged,
At the bonding positions in the region of the first portion excluding the outer edge region and the region of the inner portion excluding the inner edge region, the weakly bonded portion extends in the front-rear direction through the non-bonded portion. distributed intermittently,
A pants-type disposable wearing article characterized by:

(Effect)
The feature of the exterior body of this pants-type disposable wearing article is that the strength of the joint between the first sheet and the second sheet is changed only (the weaker the joint strength of the non-woven fabric by welding, the more flexible the fiber is, the more the fibers are suppressed from melting). Rather, it lies in devising its placement. That is, in the outer body of the pants-type disposable wearing article, the waist elastic member is covered with an outer portion obtained by joining two layers of the first sheet and the second sheet, and the first portion is at least except for the outer edge region. Since the first sheet and the second sheet are integrated, the outer surface is soft to the touch, and the weak joints are intermittently arranged in the front-rear direction through the non-joints. , when the first sheet and the second sheet are folded back to form the edge of the waist opening, and when the product is worn, the first sheet and the second sheet are less likely to shift.
Furthermore, at the joint position over the outer edge region and the inner edge region, the first sheet and the second sheet are strongly integrated in the vicinity of the folded position by arranging the strong joint portion at one place. When the first sheet and the second sheet are folded back to form the edge of the waist opening, it is easy to fold, and at that time and when the product is worn, the first sheet and the second sheet are less likely to shift at and near the edge of the waist opening. .
Further, when the waist elastic member on the waist opening side is covered with a portion having two layers of the first sheet and the second sheet in the inner portion, the covered portion forms a strong joint except for at least the inner edge region. Since the weak joints are intermittently arranged in the front-rear direction through the non-joints, the inner surface (wearer's) feel is also soft.
The strength of the joint (joint strength) means the magnitude of the tensile force required to tear the joint per unit area or unit length.

<Second Aspect>
In the joint position extending over the outer edge region and the inner edge region, the strong joint is arranged at one portion of the inner edge region, and the weak joint and the non-joint portion are arranged in other portions. at least one of
The pants-type disposable wearing article of the first aspect.

(Effect)
According to the second aspect, when the first sheet and the second sheet are folded back to form the edge of the waist opening, it is particularly easy to fold, and at that time and when the product is worn, the inner portion has a strong joint. It is preferable that the first sheet and the second sheet in the inner portion are less likely to shift at the edge of the waist opening and its vicinity.

<Third Aspect>
The strong joint provided at one of the joint positions in the inner edge region and the waist elastic member located closest to the waist opening do not overlap,
The pants-type disposable wearing article of the second aspect.

(Effect)
Since the strong joint portion is a thin and hard portion, if the waist elastic member and the strong joint portion are overlapped with each other when the strong joint portion is provided in the inner edge region, the feel of the wearer's skin tends to deteriorate. Therefore, it is preferable that they are arranged as in this aspect.

<Fourth Aspect>
At the joint position in the second portion, strong joints with relatively high joint strength are intermittently arranged in the front-rear direction via at least one of weak joints with relatively low joint strength and non-joined parts. ing,
A pants-type disposable wearing article according to any one of aspects 1 to 3.

(Effect)
As in the case of the first portion except for the outer edge region, it is preferable that the second portion is not provided with a strong joint portion in terms of flexibility, but if the entire waist portion is flexible, the waist There is a risk that the shape of the part will collapse and the fit and appearance will deteriorate. Therefore, unlike the first portion, it is also preferable that the second portion is intermittently provided with strong joints.

<Fifth Aspect>
The strong joint located closest to the waist opening in the second portion is obtained by dividing the region between the waist elastic member closest to the waist opening and the waist elastic member closest to the leg opening into three equal parts in the front-rear direction. Located in the central region of the
The pants-type disposable wearing article of the fourth aspect.

(Effect)
When the strong joint portion located closest to the waist opening side in the second portion of the outer portion is located within the above range, there is little possibility that the shape of the waist portion will be lost and the fit and appearance will be deteriorated.

<Sixth Aspect>
The outer body of the waist portion has a lower waist portion continuing to the leg opening side of the waist portion,
The lower waist portion is provided in a plurality of portions along the width direction and spaced apart from each other between the first sheet and the second sheet continuing from the outer portion and between the first sheet and the second sheet. an elongated lower waist elastic member;
The bonded position and the non-bonded position continue from the waist portion to the lower waist portion,
At the joint position in the lower waist portion, the strong joint portions are arranged adjacent to each other in the front-rear direction of the lower waist elastic member, and between the adjacent strong joint portions between the adjacent lower waist elastic members. Weak joints are arranged,
The dimensions and arrangement intervals of the strong joint portions at the joint positions of the second portion are equal to the dimensions and arrangement intervals of the strong joint portions located closest to the waist opening at the joint positions of the lower waist portion.
A pants-type disposable wearing article according to the fourth or fifth aspect.

(Effect)
It is preferable that the arrangement of strength and weakness of the joints in the lower waist part is the same as that described in Patent Document 2, but if the arrangement of the strong joints is switched at the boundary between the lower waist part and the waist part, the texture changes suddenly. Therefore, horizontal wrinkles are likely to occur at the boundary, and there is a risk that the boundary may cause a sense of discomfort. Therefore, as in this aspect, it is preferable to provide the second portion with the strong joint portion and to share the dimensions and arrangement of the strong joint portion with those of the strong joint portion positioned closest to the waist opening in the lower waist portion.

<Seventh Aspect>
The dimension in the front-rear direction of the strong joint is 2 to 4 mm,
The dimension in the front-rear direction of the weak joint is 1.0 to 2.0 times the dimension in the front-rear direction of the strong joint,
The longitudinal dimension of the non-bonded portion is 0.5 to 1.2 times the longitudinal dimension of the weakly bonded portion.
A pants-type disposable wearing article according to any one of aspects 1 to 6.

(Effect)
The dimensions of the strongly bonded portion, the weakly bonded portion, and the non-bonded portion can be determined as appropriate, but are preferably within the scope of this aspect.

<Eighth Aspect>
the apparent thickness of the weakly bonded portion is 0.5 to 0.9 times the sum of the apparent thickness of the first sheet and the apparent thickness of the second sheet in the non-bonded portion;
the apparent thickness of the strong joint is 0.5 to 0.9 times the apparent thickness of the weak joint;
A pants-type disposable wearing article according to any one of aspects 1 to 7.

(Effect)
The thicknesses of the strongly bonded portion, the weakly bonded portion, and the non-bonded portion can be appropriately determined, but are preferably within the scope of this aspect.
<Ninth Aspect>
An annular waist region formed by joining both sides of the front body and both sides of the back body, an intermediate region extending from the waist region of the front body to the waist region of the back body through the crotch portion, A waist opening provided on the opposite side of the intermediate region in the waist region, leg openings provided on both sides in the width direction of the intermediate region, an outer body forming at least the waist region, and a front body an inner body attached to the outer body so as to extend over the back body,
The exterior body has a waist portion defined as an end portion on the side of the waist opening,
The waist portion includes an outer portion in which a first sheet made of nonwoven fabric and a second sheet made of nonwoven fabric are laminated, and the first sheet and the second sheet continuing from the outer portion are folded inward at the edge of the waist opening. an inner portion formed extending entirely across said waist;
said inner portion is joined to said outer portion;
the waist portion has a plurality of elongated waist elastic members spaced apart from each other along the width direction between the first sheet and the second sheet in the inner portion;
In the first sheet and the second sheet, a bonded position extending in the front-rear direction over the outer part and the inner part and a non-bonded position extending in the front-rear direction extending over the outer part and the inner part are alternately arranged in the width direction. provided repeatedly,
At the joining position, the first sheet and the second sheet are welded and joined via the waist elastic member at a portion having the waist elastic member therebetween and directly at a portion not having the waist elastic member. has been
The inner portion has an inner edge area of 5 mm or less from the edge of the waist opening to the leg opening side,
The outer portion of the waist portion has a first portion located closer to the waist opening than the center in the front-rear direction, and a second portion located on the opposite side,
said inner edge region having at least one said waist elastic member;
At the joint position in the inner portion, strong joint portions having relatively high joint strength are arranged on both sides of the waist elastic member in the front-rear direction, and the adjacent strong joint portions between the adjacent lower waist elastic members are arranged. The part between is considered to be the weak joint,
At the joint position in the first portion, the weak joint is intermittently arranged in the front-rear direction via the non-joint.
A pants-type disposable wearing article characterized by:

(Effect)
The feature of the exterior body of this pants-type disposable wearing article is that the strength of the joint between the first sheet and the second sheet is changed only (the weaker the joint strength of the non-woven fabric by welding, the more flexible the fiber is, the more the fibers are suppressed from melting). Rather, it lies in devising its placement. That is, in the outer body of the pants-type disposable wearing article, the elastic member of the waist portion is covered with the outer portion obtained by joining two layers of the first sheet and the second sheet, and the first portion has a strong joint portion. Since the first sheet and the second sheet are integrated with the weakly bonded portions intermittently arranged in the front-rear direction via the non-bonded portions, the first sheet and the second sheet are integrated while the outer surface is soft to the touch. When the second sheet is folded back to form the edge of the waist opening and when the product is worn, the first sheet and the second sheet are less likely to shift.
Furthermore, since the first sheet and the second sheet are strongly integrated in the vicinity of the folding position by arranging the strong joint portion in the inner portion including the inner edge region, the first sheet and the second sheet can be separated. It is easy to fold when forming the edge of the waist opening by folding back, and the first sheet and the second sheet are less likely to shift at the edge of the waist opening and the vicinity thereof at that time and when the product is worn.

As described above, according to the present invention, it is possible to prevent the sheet from slipping while improving the texture of the waist opening and its vicinity.

Fig. 2 is a plan view showing the inner surface of the underpants-type disposable diaper in an unfolded state; Fig. 2 is a plan view showing the outer surface of the pants-type disposable diaper in an unfolded state; FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1; 3 is a cross-sectional view taken along line 3-3 of FIG. 1; FIG. (a) 4-4 cross-sectional view of FIG. 1, and (b) 5-5 cross-sectional view of FIG. 1 is a perspective view of a pants-type disposable diaper; FIG. FIG. 4 is a plan view showing the outer surface of the inner body in the unfolded state together with the outline of the outer body; FIG. 4 is a cross-sectional view of the exterior body at the joint position, schematically showing exaggerated strong joints, weak joints, and non-joints; FIG. 9 shows (a) a plan view of the outer portion and (b) a plan view of the inner portion in the example of FIG. 8; FIG. 4 is a cross-sectional view of the exterior body at the joint position, schematically showing exaggerated strong joints, weak joints, and non-joints; 11 is (a) a plan view of the outer portion and (b) a plan view of the inner portion in the example of FIG. 10; FIG.

As an example of a pants-type disposable wearing article, a pants-type disposable diaper will be described in detail below with reference to the accompanying drawings. Each constituent member adjacent to each other in the thickness direction is fixed or joined, if necessary, in the same manner as known diapers, except for the fixing or joining portions described below. A dotted pattern portion in the cross-sectional view indicates an adhesive such as a hot-melt adhesive as the fixing or joining means. The hot-melt adhesive can be applied by slot coating, continuous-line or dotted-line bead coating, spiral-shaped, Z-shaped, wavy-shaped spray coating, or pattern coating (transfer of hot-melt adhesive by letterpress method). can be applied by any method. Alternatively or additionally, at the fixing portion of the elastic member, a hot melt adhesive can be applied to the outer peripheral surface of the elastic member to fix the elastic member to the adjacent member. Hot-melt adhesives include, for example, EVA-based, adhesive rubber-based (elastomer-based), olefin-based, and polyester-polyamide-based adhesives, and can be used without particular limitation. As a fixing or joining means for joining each constituent member, a material welding means such as heat sealing or ultrasonic sealing can be used. In portions where liquid permeability in the thickness direction is required, adjacent components in the thickness direction are fixed or joined in an intermittent pattern. For example, when such intermittent fixing or bonding is performed with a hot-melt adhesive, intermittent pattern coating such as spiral, Z-shaped, and wavy patterns can be suitably used, and the range of coating width by one nozzle or more can be preferably used. In the case of coating, intermittent pattern coating such as a spiral, Z-shape, or wavy pattern can be performed with or without spacing in the width direction. As a joining means for joining each constituent member, a material welding means such as heat sealing or ultrasonic sealing can be used.

In addition, as the nonwoven fabric in the following description, a known nonwoven fabric can be appropriately used depending on the site and purpose. Constituent fibers of non-woven fabrics include, for example, synthetic fibers such as olefin-based, polyester-based, and polyamide-based fibers such as polyethylene or polypropylene (including composite fibers such as core-sheath fibers in addition to single-component fibers), as well as recycled rayon and cupra. Fibers, natural fibers such as cotton, etc., can be selected without particular limitation, and these can also be mixed and used. In order to increase the softness of the nonwoven fabric, it is preferable to use crimped fibers as the constituent fibers. In addition, even if the constituent fibers of the nonwoven fabric are hydrophilic fibers (including fibers made hydrophilic by a hydrophilic agent), they are hydrophobic fibers or water-repellent fibers (including fibers made water-repellent by a water-repellent agent). ). In addition, nonwoven fabrics are generally classified into short fiber nonwoven fabrics, long fiber nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, thermal bonded (air-through) nonwoven fabrics, and needle punched nonwoven fabrics, depending on the fiber length, sheet forming method, fiber bonding method, and laminate structure. Nonwoven fabrics are classified into nonwoven fabrics, point-bonded nonwoven fabrics, laminated nonwoven fabrics (such as SMS nonwoven fabrics and SMMS nonwoven fabrics in which a meltblown layer is sandwiched between spunbond layers), and any of these nonwoven fabrics can be used.

1 to 6 show pants-type disposable diapers. This pants-type disposable diaper comprises a rectangular front exterior body 12F constituting at least the waist circumference of the front body F, a rectangular rear exterior body 12B constituting at least the waist circumference of the back body B, and the front exterior body 12F. An interior body 200 is provided inside the exterior bodies 12F and 12B so as to extend to the rear exterior body 12B through the crotch part, and both sides of the front exterior body 12F and both sides of the rear exterior body 12B are provided. are joined to form the side seal 12A, 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 torso passes. The portions surrounded by the lower edges of the exterior bodies 12F and 12B and the side edges of the interior body 200 form leg openings 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. Symbol Y indicates the total length of the diaper in the unfolded state (length in the longitudinal direction 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 X indicates the unfolded state. shows the full width of the diaper in .

This pants-type disposable diaper has an annular waist region T and a waist region T of the front body F formed by joining both sides of the front body F and both sides of the back body B with side seals 12A. a waist opening WO provided on the side opposite to the intermediate region L in the waist region T, and provided on both sides of the intermediate region L in the width direction WD. and leg openings LO. In other words, the waist region T is defined as the front-rear direction LD range from the waist opening WO to the upper ends of the leg openings LO, and the middle region L is the lower end of the side seal 12A of the front body F and the side seal 12A of the back body B. is determined as the front-rear direction LD range between the lower end of 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 curvilinear shape along the legs of the wearer, and the diaper as a whole has a substantially hourglass shape.

The pant-type disposable diaper also has two main assemblies, namely outer bodies 12F, 12B forming at least the waist region T, and outer bodies 12F, 12B attached to extend from the front body F to the back body B. An inner body 200 is provided.

(inner body)
The inner body 200 can take any shape, but in the illustrated form it is rectangular. As shown in FIGS. 3 to 5, the inner body 200 comprises a body-side top sheet 30, a liquid-impermeable sheet 11, and an absorbent element 50 interposed therebetween. This is the main body part responsible for the absorption function. Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid permeating the top sheet 30 to the absorbent element 50, and reference numeral 60 denotes an intermediate sheet. 4 shows rise gathers 60 extending from both sides of the inner body 200 so as to come in contact with the legs of the wearer in order to prevent leakage of excrement to both sides of the inner body 200. FIG.

(top sheet)
The top sheet 30 has the property of being permeable to liquid, and examples thereof include perforated or non-perforated nonwoven fabrics and perforated plastic sheets. Further, the top sheet 30 may be composed of one sheet, or may be composed of a laminated sheet obtained by laminating two or more sheets. Similarly, the top sheet 30 may consist of one sheet or two or more sheets in the planar direction.

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

The top sheet 30 can be fixed to a member adjacent to the back side by means of material welding, such as heat sealing or ultrasonic sealing, or hot-melt adhesive for the purpose of preventing misalignment with respect to the member on the back side. desirable. In the illustrated example, the top sheet 30 is fixed to the surface of the intermediate sheet 40 and the surface of the portion of the packaging sheet 58 located on the front side of the absorbent body 56 with a hot-melt adhesive applied to its back surface.

(intermediate sheet)
An intermediate sheet (also called a “second sheet”) 40 having a faster liquid permeation rate than the top sheet 30 can be provided in order to quickly transfer the liquid that has permeated the top sheet 30 to the absorbent body. The intermediate sheet 40 is intended to quickly transfer the liquid to the absorbent body to enhance the absorption performance of the absorbent body and to prevent the phenomenon of "backflow" of the absorbed liquid from the absorbent body. The intermediate sheet 40 can also be omitted.

Examples of the intermediate sheet 40 include materials similar to those of the top sheet 30, spunlace nonwoven fabric, spunbond nonwoven fabric, SMS nonwoven fabric, pulp nonwoven fabric, mixed sheet of pulp and rayon, pointbond nonwoven fabric, and crepe paper. In particular, an air-through nonwoven fabric is preferred because it is bulky. Composite fibers having a core-sheath structure are preferably used for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. The basis weight is preferably 17-80 g/m ² , more preferably 17-50 g/m ² . The thickness of the raw fibers of the nonwoven fabric is preferably 2.0 to 10 dtex. In order to make the non-woven fabric bulky, it is also preferable to use eccentric fibers, hollow fibers, or eccentric and hollow fibers whose core is not in the center as mixed fibers of all or part of the raw material fibers.

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

The intermediate sheet 40 can be fixed to a member adjacent to the back side by means of material welding, such as heat sealing or ultrasonic sealing, or 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 absorbent body 56 with a hot-melt adhesive applied to its back surface.

(liquid-impermeable sheet)
The material of the liquid-impermeable sheet 11 is not particularly limited, but examples thereof include plastic films made of olefin resins such as polyethylene and polypropylene, laminated nonwoven fabrics in which a plastic film is provided on the surface of nonwoven fabrics, and plastic films. A laminated sheet in which a nonwoven fabric or the like is laminated and joined to the sheet can be exemplified. 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. Moisture-permeable plastic films include microporous plastic films obtained by kneading an inorganic filler into an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching the sheet in a uniaxial or biaxial direction. is widely used. Other methods include non-woven fabrics using microdenier fibers, leak-proof enhancement by reducing fiber voids by applying heat and pressure, and coating with superabsorbent or hydrophobic resins or water repellents. Therefore, a sheet made liquid-impermeable without using a plastic film can also be used as the liquid-impermeable sheet 11, but sufficient adhesive strength is obtained when bonding with the cover nonwoven fabric 13 described later via a hot-melt adhesive. It is desirable to use a resin film in order to obtain

The liquid-impermeable sheet 11 has a width that can be accommodated on the back side of the absorbent element 50 as shown in the figure. It can also extend to both sides. It is appropriate that the width of this extended portion is about 5 to 20 mm on each side.

(Getting up gathers)
The rising gathers 60 extend along both sides of the inner body 200 over the entire length of the front-rear direction LD, and are provided to prevent side leakage by coming into contact with the wearer's legs. If necessary, the rising gathers 60 can be omitted.

The rising gathers 60 (so-called three-dimensional gathers) shown in FIGS. The riser gathers 60 have a root side portion 60B that rises obliquely toward the center in the width direction, and a tip side portion 60A that rises obliquely toward the outside in the width direction from the intermediate portion, but are not limited to this. Instead, it is possible to make appropriate modifications such as a configuration in which the entire body stands on the center side in the width direction.

More specifically, the illustrated rising gathers 60 are formed by folding a band-shaped gathered nonwoven fabric 62 having a length equal to the length of the inner body 200 in the front-rear direction in the width direction WD at the leading end to fold it in two. While overlapping, a plurality of elongated gather elastic members 63 are fixed in a stretched state along the longitudinal direction at intervals in the width direction WD between the folded portions and the sheets in the vicinity thereof. A base end portion of the rising gathers 60 located on the opposite side to the tip portion (the end portion on the side opposite to the sheet folded portion in the width direction WD) is fixed to the side portion of the inner body 200 on the back side of the liquid-impermeable sheet 11. The base portion 65 is formed as a flattened base portion 65, and the portion other than the base portion 65 is a body portion 66 extending from the base portion 65 (portion on the folded portion side). Further, the body portion 66 has a root side portion 60B extending toward the center in the width direction, and a distal end portion 60A that is folded back at the tip of the root side portion 60B and extends outward in the width direction. This form 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 employed. Both ends of the main body portion 66 in the front-rear direction are laid down portions 67 fixed to the side surfaces of the top sheet 30 in the laid-down state, while an intermediate portion in the front-rear direction positioned therebetween is not fixed. A gathered elastic member 63 extending in the front-rear direction LD is fixed to at least the tip of the free portion 68 in a stretched state.

In the riser gathers 60 configured as described above, the contractile force of the gather elastic members 63 acts to bring the front and rear ends closer together, but the front and rear ends of the body portion 66 are fixed so as not to stand up. On the other hand, since 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 indicated by the arrow in FIG. In particular, when the base portion 65 is located on the back side of the inner body 200, the free portion 68 in and near the crotch portion stands up so as to open outward in the width direction, so that the rising gathers 60 come into contact with the leg circumference. and the fit improves.

Like the rising gathers 60 in the illustrated example, the main body portion 66 is curved and consists of a root side portion 60B extending toward the center in the width direction and a distal end portion 60A extending outward in the width direction by folding back at the tip of the root side portion 60B. In the form, the tip side portion 60A and the root side portion 60B are joined in the lying down state at the lying portion 67, and the root side portion 60B is joined to the top sheet 30 in the lying down state. At least one of hot-melt adhesives by various application methods and material welding means such as heat sealing and ultrasonic sealing can be used to join the facing surfaces in the lodging portion 67 . In this case, the bonding of the root side portion 60B and the top sheet 30 and the bonding of the tip side portion 60A and the root side portion 60B may be performed by the same means or by different means. For example, it is one preferred form that the root side portion 60B and the top sheet 30 are joined with a hot melt adhesive, and the tip side portion 60A and the root side portion 60B are joined with material welding.

As the gathered nonwoven fabric 62, nonwoven fabric such as spunbond nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.), meltblown nonwoven fabric, etc., which is flexible and excellent in uniformity and concealability, is water-repellent with silicone or the like as necessary. A treated material can be preferably used, and the fiber areal weight is preferably about 10 to 30 g/m ² . A thread rubber or the like can be used as the gather elastic member 63 . When spandex thread rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate when fixed is preferably 150 to 350%, more preferably 200 to 300%. Also, as shown in the figure, a waterproof film 64 can be interposed between the gathered nonwoven fabrics 62 folded in two. In this case, the gathered nonwoven fabrics 62 can be partially omitted where the waterproof film 64 exists. However, in order to make the appearance and feel of the product like cloth, it is necessary that at least the outer surface of the riser gathers 60 from the base end to the tip be 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 2-6, more preferably 3-5. An appropriate arrangement interval is 3 to 10 mm. With this configuration, the area in which the gather 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 root side.

In the free portion 68 of the rising gather 60, the inner layer and the outer layer of the gathered nonwoven fabric 62 are adhered together, and the gathered elastic member 63 sandwiched between them is fixed by hot-melt adhesive, heat sealing, ultrasonic wave, or the like by various coating methods. At least one of fixing means by material welding such as a seal can be used. If the inner layer and the outer layer of the gathered nonwoven fabric 62 are entirely adhered together, the flexibility is impaired, so it is preferable that the portions of the gathered elastic member 63 other than the adhered portion are not adhered or adhered weakly. In the illustrated example, the hot-melt adhesive is applied only to the outer peripheral surface of the gathered elastic member 63 by applying means such as a comb gun or a sure wrap nozzle, and the gathered elastic member 63 is sandwiched between the inner layer and the outer layer of the gathered nonwoven fabric 62 . The gathered 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. there is

Similarly, for fixing the waterproof film 64 and the gathered nonwoven fabric 62 incorporated in the riser gather 60 and fixing the lodging portion 67, hot melt adhesives by various coating methods and material welding such as heat sealing and ultrasonic sealing are used. At least one of the means according to can be used.

(absorbing element)
The absorbent element 50 has an absorbent body 56 and a wrapping sheet 58 that wraps the entire absorbent body 56 . The packaging sheet 58 can also be omitted.

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

Absorber 56 may be rectangular, but as shown in FIG. 7, if it has an hourglass shape with a constricted portion 56N narrower in width than both front and rear sides, as shown in FIG. This is preferable because the fit of the riser gathers 60 around the legs is improved.

In addition, the dimensions of the absorbent body 56 can be appropriately determined as long as it extends to the front, rear, left, and right of the urination opening position, but it preferably extends to the peripheral edge of the inner body 200 or its vicinity in the front-back direction LD and width direction WD. . The reference numeral 56X indicates the full width of the absorber 56. As shown in FIG.

(superabsorbent polymer particles)
Absorbent body 56 may contain superabsorbent polymer particles in part or in its entirety. Superabsorbent polymer particles include "powder" in addition to "particles". As the superabsorbent polymer particles, those used in this type of disposable diaper can be used as they are. The percentage of particles remaining on the sieve is preferably 30% by weight or less, and the percentage of particles remaining on the sieve after sieving (shaking for 5 minutes) using a 180 μm standard sieve (JIS Z8801-1: 2006) is 60. % by weight or more is desirable.

The material for the superabsorbent polymer particles can be used without any particular limitation, but those with a water absorption of 40 g/g or more are suitable. Superabsorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based particles. and acrylic acid (salt) polymers can be used. As for the shape of the superabsorbent polymer particles, the powder particles that are commonly used are suitable, but other shapes can also be used.

As the superabsorbent polymer particles, those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less, are preferably used. If the water absorption rate is too slow, the liquid supplied into the absorbent body 56 tends to return to the outside of the absorbent body 56, which is called reversion.

Also, as the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more, for example, are preferably used. As a result, even when the absorbent body 56 is bulky, it is possible to effectively suppress the feeling of stickiness after liquid absorption.

The basis weight of the superabsorbent polymer particles can be appropriately determined according to the absorption amount required for the use of the absorbent body 56 . Therefore, although it cannot be generalized, it can be 50 to 350 g/m ² .

(packaging sheet)
When the packaging sheet 58 is used, tissue paper, particularly crepe paper, non-woven fabric, poly-laminated non-woven fabric, a perforated sheet, or the like can be used as the material. However, it is desirable that the sheet is such that the superabsorbent polymer particles do not escape. When non-woven fabric is used instead of crepe paper, hydrophilic SMS non-woven fabric (SMS, SSMMS, etc.) is particularly suitable, and its material can 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 the superabsorbent polymer particles from the front and back edges, etc. It is preferable that the absorbent body 56 is wound in a shape, the front and rear edges thereof protrude from the front and rear of the absorbent body 56, and the overlapping portions of the wound portion and the front and rear protruding portions are joined by joining means such as hot-melt adhesive or material welding.

(Exterior body)
The illustrated outer bodies 12F and 12B are composed of a rectangular front outer body 12F forming the waist region T of the front body F and a rectangular rear outer body 12B forming the waist region T of the back body B. , the front armor body 12F and the rear armor body 12B are not continuous on the crotch side and are spaced apart in the front-rear direction LD. This separation distance 12d can be, for example, approximately 150 to 250 mm. The outer bodies 12F and 12B may be an integral body continuous from the front body F to the back body B through the crotch portion.

The portion of the outer body 12F, 12B located in the waist region T can be divided into a waist portion W forming an end portion on the side of the waist opening WO and a waist lower portion U which is a portion below this. . If the portion of the outer body 12F, 12B located in the waist 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 boundary is located closest to the waist opening WO side. The waist portion W is located on the waist opening WO side of the boundary, and if there is no such boundary, the waist extending portion 12E extending toward the waist opening WO side of the absorbent body 56 or the inner body 200 is the waist portion W. . The length of these LDs in the front-rear direction varies 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 waist lower portion U can be 65 to 120 mm.

In the illustrated example, the front exterior body 12F and the rear exterior body 12B have the same dimension in the front-rear direction LD and do not have a portion located in the middle region L, but as indicated by the two-dot chain line in FIG. , the front-side exterior body 12F is longer in the longitudinal direction than the front-side exterior body 12F, and the front-side exterior body 12F does not have a portion located in the middle region L, but the rear side exterior body 12B has a waist region. 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 a groin cover portion extending from the waist region T toward the intermediate region L side, or may be provided with a groin cover portion but without a buttock cover portion.

Elastic members 15 and 17 are incorporated in the outer bodies 12F and 12B in order to improve fit around the wearer's waist. is formed. In this stretchable region A2, the exterior bodies 12F and 12B contract with the contraction of the elastic members in the natural length state, and wrinkles or folds are formed. Elongation is possible up to a predetermined elongation rate. As the elastic members 15 and 17, well-known elongated elastic members such as filamentous and strip-like elastic members can be used without particular limitation. As the elastic members 15 and 17, either synthetic rubber or natural rubber may be used.

To explain the elastic members 15 and 17 in the illustrated example in more detail, a plurality of waist elastic members 17 are spaced in the front-rear direction so as to be continuous over the entire width direction WD of the waist portions W of the outer bodies 12F and 12B. It is installed with a gap. In addition, one or more of the waist elastic members 17 disposed in the region adjacent to the lower waist portion U may overlap the inner body 200, or may overlap the inner body 200 at the central portion in the width direction. , may be provided on both sides in 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. ² to 15, preferably 4 to 10, at intervals of 2 to 12 mm, particularly 3 to 7 mm. The ratio is preferably about 150-400%, more preferably about 220-320%. The interval of 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.

Moreover, it is preferable that a plurality of lower waist elastic members 15 made of elongated elastic members are attached to the lower waist portions U of the outer bodies 12F and 12B at intervals in the front-rear direction. The lower waist 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. ² ) are preferably provided at intervals of 1 to 15 mm, particularly 3 to 8 mm, and the elongation rate in the width direction WD of the waist lower portion U is 200 to 350%, particularly 240%. It is preferably about 300%. The interval in the front-rear direction LD of the lower waist elastic member 15 may be constant, or may vary in the middle in the front-rear direction LD as shown in the illustrated example.

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

Such elastic regions A2 and non-stretchable regions A1 are obtained by fixing the elastic members 15 in manufacturing the outer bodies 12F and 12B, and then pressing and heating the lower waist elastic members 15 in the regions that become the non-stretchable regions A1. It can be constructed by cutting at one place in the middle in the width direction, or by finely cutting at many places, leaving stretchability in the stretchable region A2 and eliminating stretchability in the non-stretchable region A1. In these cases, in the non-stretchable region A1, the cut piece 16 of the elastic member, which does not substantially contribute to stretching, remains inside the exterior bodies 12F and 12B.

(Laminated structure of exterior body)
As shown in FIGS. 8 and 9, the waist portion W includes an outer portion 18 in which a first sheet 12S made of nonwoven fabric and a second sheet 12H made of nonwoven fabric are laminated, and the first sheet 12S continuing from the outer portion 18 and The second sheet 12H is folded inwardly at the edge We of the waist opening WO, and the first sheet 12S thereof has an inner portion 19 formed extending over the entire waist portion W, and the inner portion 19 is hot-melt bonded. It is joined to the outer part 18 via an agent HM (which may be welded). In the illustrated example, 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, the entire waist region T), but are limited to this. However, appropriate modifications are possible, such as forming the waist lower portion U with a separate sheet. Further, in the illustrated example, the second sheet 12H of the inner portion 19 extends only to the middle of the waist portion W in the front-rear direction LD, and the first sheet 12S extends from the waist portion W to the lower waist portion U to form an interior body. Although the end portion of the waist opening WO side of 200 is covered, the present invention is not limited to this. Both 12S and the second seat 12H may be accommodated within the waist portion W, or may extend only to the waist opening WO side of the interior body 200 and may not cover the end of the interior body 200. .

The materials of the first sheet 12S and the second sheet 12H can be appropriately determined as long as they are nonwoven fabrics. For example, the first sheet 12S and the second sheet 12H are made of synthetic fibers such as olefin-based, polyester-based, and polyamide-based fibers such as polyethylene and polypropylene, mixed fibers and composite fibers in which two or more of these fibers are used. Nonwovens 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 appropriately determined. As an example, the nonwoven fabrics used for the first sheet 12S and the second sheet 12H are long-fiber nonwoven fabrics each having 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 preferred.

In the example shown in FIGS. 8 and 9, the waist elastic member 17 provided in the waist portion W is provided between the outer portion 18 and the inner portion 19. In the illustrated example, the waist elastic member 17 is fixed to the second sheet 12H of the outer portion 18 and the inner portion 19 with a hot melt adhesive HM applied to its outer peripheral surface, but it may be fixed by welding. The waist portion W shrinks in the width direction WD together with the waist elastic member 17 and forms wrinkles in the state of the natural length. It is in perfect condition with no wrinkles.

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 may be applied to other sheets. It can also be placed in between. In the illustrated example, the lower waist elastic member 15 is fixed to the first sheet 12S and the second sheet 12H by welding at a joining position 80, which will be described later. It may be fixed to the first sheet 12S and the second sheet 12H by a hot melt adhesive HM. The lower waist portion U shrinks in the width direction WD together with the lower waist elastic member 15 in the state of its natural length and forms wrinkles. It is designed to be completely free of wrinkles when it is spread out and unfolded.

In the first sheet 12S and the second sheet 12H, a bonding position 80 continuing in the front-rear direction LD across the outer portion 18 and the inner portion 19 and a non-bonding position 90 continuing in the front-rear direction LD across the outer portion 18 and the inner portion 19 are separated by width. They are alternately and repeatedly provided in the direction WD, and the first sheet 12S and the second sheet 12H are welded and joined at each joint position 80 . The joining position 80 and the non-joining position 90 extend not only to the waist portion W but also to the lower waist portion U in the illustrated example. Here, in the state where the first sheet 12S and the second sheet 12H are welded and joined, almost all the fibers of the first sheet 12S and the second sheet 12H are melted and integrated (for example, less than 10 fibers protrude). not only in a film-like state (higher transparency than the surroundings), but also in both the first sheet 12S and the second sheet 12H, almost all of the fibers of the layers on the joint surface side are welded. , a state in which the fibers of the layer on the opposite side are not welded and remain in an independent state, or only a part of the fibers located on the joint surface of at least one of the first sheet 12S and the second sheet 12H are welded. state is also included. It is desirable that the opposing surfaces of the first sheet 12S and the second sheet 12H are not entirely bonded with the hot-melt adhesive HM, but if necessary, partially bonded to both ends of the waist lower elastic member 15, for example. It may be glued. The joining position 80 may be linear along the front-rear direction LD as shown in the figure, or may be a slanted straight line with an inclination of 0 to 30° in the front-rear direction LD, or may be a wavy line. The width of the joining position 80 (the width of the joining portions 81 and 82) and the interval in the width direction WD (the width of the non-joining position 90) may be determined as appropriate. In particular, it can be about 0.5 to 3 mm, and the interval in the width direction WD can be about 3 to 10 mm, particularly about 3 to 5 mm. In addition to ultrasonic sealing, heat sealing by heating a roll can be used as a processing method for welding and joining.

The outer portion 18 has an outer edge region Eo of 5 mm or less from the edge We of the waist opening WO to the leg opening LO side, and the inner portion 19 has an inner edge of 5 mm or less from the edge We of the waist opening WO to the leg opening LO side. It has an area Ei. In addition, the outer portion 18 of the waist portion W is positioned closer to the waist opening WO than the middle in the front-rear direction LD, and includes a first portion P1 including the outer edge region Eo and a second portion P2 positioned on the opposite side. The waist portion W has at least one waist elastic member 17 at each position overlapping the first portion P1 and the second portion P2. Characteristically, in the joint position 80 over the outer edge region Eo and the inner edge region Ei, a strong joint portion 81 having a relatively high joint strength is arranged at one place, and the other portions are: At least one of the weakly bonded portion 82 and the non-bonded portion 83 having relatively low bonding strength is arranged, and the region of the first portion P1 excluding the outer edge region Eo and the inner edge region Ei of the inner portion 19 are arranged. Weakly bonded portions 82 are intermittently arranged in the front-rear direction LD via non-bonded portions 83 at bonding positions 80 (bonding positions 80 in the portion following the inner edge region Ei) in the region other than the edge region Ei. As in the examples shown in FIGS. 8 and 9, when one of the first sheet 12S and the second sheet 12H of the inner portion 19 extends further toward the center in the front-rear direction LD than the other sheet, the A trace 82m similar to the weak joint 82 may remain on the extended portion, or may not remain at all. In addition, when this one sheet extends to the lower waist portion U, the trace 82m similar to the weak joint portion 82 may remain halfway through the extended portion (example shown) or over the entire portion, or may be left completely. It doesn't have to be.

In this way, the waist elastic member 17 is covered with the outer portion 18 formed by joining the two layers of the first sheet 12S and the second sheet 12H, and the first portion P1 is a strong joint portion except for at least the outer edge region Eo. 81, the weakly bonded portions 82 are intermittently arranged in the front-rear direction LD via the non-bonded portions 83, and the first sheet 12S and the second sheet 12H are integrated, the outer surface is soft to the touch. However, when the first sheet 12S and the second sheet 12H are folded back to form the edge We of the waist opening WO and when the product is worn, the first sheet 12S and the second sheet 12H are less likely to shift. Furthermore, in the joint position 80 extending over the outer edge region Eo and the inner edge region Ei, a strong joint portion 81 is arranged at one place, so that the first sheet 12S and the second sheet 12H are firmly integrated in the vicinity of the folded position. Therefore, when the first sheet 12S and the second sheet 12H are folded back to form the edge We of the waist opening WO, the edge We of the waist opening WO and its vicinity can be easily folded at that time and when the product is worn. , the first sheet 12S and the second sheet 12H are less likely to shift. Further, as shown in FIG. 8, when the waist elastic member 17 on the side of the waist opening WO is covered with a portion having two layers of the first sheet 12S and the second sheet 12H in the inner portion 19, the covered portion , there is no strong joint 81 except for at least the inner edge region Ei, and the weak joint 82 is intermittently arranged in the front-rear direction LD via the non-joint portion 83, so that the inner surface (wearer's) feel is improved. is also flexible.

Here, the strength of the joint (joint strength) means the magnitude of the tensile force required to tear the joint per unit area or unit length. The degree of bonding strength can be determined as appropriate. It is preferable that it is in the form of a film (higher transparency than the surroundings). In the weakly bonded portion 82, although some or all of the fibers located on the joint surfaces of the first sheet 12S and the second sheet 12H are welded, some or all of the fibers on the opposite surfaces are not welded. Instead, it is preferable that a large number of fibers remain deformable.

The position of the boundary between the first portion P1 and the second portion P2 can be determined as appropriate, but the region between the waist elastic member 17 closest to the waist opening WO and the waist elastic member 17 closest to the leg opening LO is It is preferably located in the central region when trisecting in the front-rear direction LD.

Although the dimensions of the strong joint portion 81, the weak joint portion 82, and the non-joint portion 83 can be determined as appropriate, they preferably fall within the following ranges, for example.
Dimension of the front-rear direction LD of the strong joint 81: 2 to 4 mm
Dimension in the front-rear direction LD of the weak joint 82: 1.0 to 2.0 times the dimension in the front-rear direction LD of the strong joint 81 0.5 to 1.2 times the size

Although the thicknesses of the strong joint portion 81, the weak joint portion 82, and the non-joint portion 83 can be determined as appropriate, they preferably fall within the following ranges, for example.
Apparent thickness of the weakly bonded portion 82: 0.5 to 0.9 times the sum of the apparent thickness of the first sheet 12S and the apparent thickness of the second sheet 12H in the non-bonded portion 83 Thickness: 0.5 to 0.9 times the apparent thickness of the weak joint 82

The strong joint portion 81 provided at one of the joint positions 80 over the outer edge region Eo and the inner edge region Ei can be provided in the outer edge region Eo. When the second sheet 12H is folded inward to form the edge We of the waist opening WO, it is particularly easy to fold, and at that time and when the product is worn, the strong joint 81 is positioned at the inner portion 19, It is preferable because the first sheet 12S and the second sheet 12H in the inner portion 19 are less likely to shift at the edge We of the waist opening WO and its vicinity. In this case, the strong joint portion 81 provided in the inner edge region Ei is preferably within a range of 1 to 9 mm, particularly preferably within a range of 2 to 8 mm, from the edge We of the waist opening to the leg opening side. In addition, since the strong joint 81 is a thin and hard portion, if the waist elastic member 17 and the strong joint 81 overlap each other when the strong joint 81 is provided in the inner edge region Ei, the feel of the wearer's skin tends to deteriorate. Therefore, it is preferable that the strong joint portion 81 provided at one joint position 80 in the inner edge region Ei and the waist elastic member 17 positioned closest to the waist opening WO do not overlap as shown in the illustrated example. From this point of view, and from the point of view that the contraction wrinkles are sufficiently formed at the edge We of the waist opening WO, the distance between the edge We of the waist opening WO and the waist elastic member 17 located closest to the waist opening WO side in the front-rear direction LD. It is preferable that the interval is 0 to 5 mm. On the other hand, when the strong joint portion 81 is provided in the outer edge region Eo, the strong joint portion 81 is preferably within a range of 0 to 5 mm from the edge We of the waist opening to the leg opening side.

In terms of flexibility, it is preferable that the second portion P2 is not provided with the strong joint portion 81 similarly to the region of the first portion P1 excluding the outer edge region Eo. However, if the waist portion W is entirely flexible, the shape of the waist portion W may be lost and the wearing comfort and appearance may be deteriorated. Therefore, as in the illustrated example, at the bonding position 80 in the second portion P2, the strong bonding portion 81 with relatively high bonding strength is at least one of the weak bonding portion 82 with relatively low bonding strength and the non-bonding portion 83. It is also preferable to be intermittently arranged in the front-rear direction LD via. Also, in this case, the strong joint portion 81 positioned closest to the waist opening WO in the second portion P2 is positioned from the position of the third waist elastic member 17 to the sixth waist elastic member 17 counted from the waist opening WO side. , the rigidity is improved by the strong joint portion 81, and the possibility that the shape of the waist portion W will be lost and the fit and appearance will be deteriorated is reduced, which is preferable.

The strength of the joints in the lower waist portion U can be determined as appropriate. For example, the entirety is a strong joint portion 81, or the portion (crossing portion) having the lower waist elastic member 15 is a weak joint portion 82, and the other portion below the waist. A portion (non-intersecting portion) having no elastic member 15 may be used as the strong joint portion 81 . In one preferred example, as in Patent Document 2, at the joint position 80 in the lower waist portion U, the strong joint portions 81 are arranged adjacent to each other in the front-rear direction LD of the lower waist elastic member 15, and are adjacent to each other. A portion between the adjacent strong joints 81 between the matching lower waist elastic members 15 is a weak joint 82 . In this case, as long as the first sheet 12S and the second sheet 12H are welded to the lower waist elastic member 15, the intersection of the joint position 80 and the lower waist elastic member 15 becomes a weak joint 82 as in the illustrated example. It is preferable that there is a strong joint portion 81, but it may be a strong joint portion 81 as well. Further, when the placement of the strong joint portion 81 is switched at the boundary between the lower waist portion U and the waist portion W, the texture changes abruptly. There is a risk. Therefore, as described above, the second portion P2 is also provided with the strong joints 81, and the dimensions and arrangement intervals of the strong joints 81 at the joint positions 80 of the second portion P2 are the most at the joint positions 80 of the lower waist portion U. It is preferable that the dimensions and arrangement intervals are equal to those of the strong joints 81 located on the side of the waist opening WO.

The waist elastic member 17 provided in the waist portion W is provided between the outer portion 18 and the inner portion 19 in the example shown in FIGS. 8 and 9, but as shown in FIGS. 19 is provided between the first sheet 12S and the second sheet 12H. The portions (non-intersecting portions) having no elastic members 17 may be directly welded and joined. In this case, the inner edge region Ei has at least one waist elastic member 17, and strong joints having relatively high joint strength are provided on both sides of the waist elastic member 17 in the front-rear direction LD at the joint positions 80 in the inner portion 19. 81 are arranged, and the portion between the adjacent strong joint portions 81 between the adjacent waist lower elastic members 15 is the weak joint portion 82, and the joint position 80 in the first portion P1 of the outer portion 18 is , the weakly bonded portions 82 are preferably intermittently arranged in the front-rear direction LD via the non-bonded portions 83 .

In the example shown in FIGS. 10 and 11, both the first sheet 12S and the second sheet 12H of the inner portion 19 extend to the same position in the front-rear direction LD in the lower waist portion U, but both sheets are closest to the leg opening. One sheet (for example, the first sheet 12S) may extend from the other sheet to the leg opening LO side as long as it extends to the leg opening LO side from the waist elastic member 17 on the LO side (not shown). In that case, traces similar to those of the strong joints 81 and the weak joints 82 may be left partway through or all over the extended portion, or may not be left at all. As shown in FIGS. 10 and 11, when both the first sheet 12S and the second sheet 12H of the inner portion 19 extend to the lower waist portion U, in that extension the first sheet 12S and the second sheet 12H are folded in a similar pattern as the inner portion 19. The joint portions 81 and 82 of the sheet 12S and the second sheet 12H may be provided, but if the extension portion is not provided with the waist lower elastic member 15 as in the illustrated example, it is the same as the first portion P1. Furthermore, it is preferable that the weak joint portions 82 are intermittently arranged in the front-rear direction LD at the joint positions 80 via the non-joint portions 83 .

In the example shown in FIGS. 10 and 11 as well, the elastic member of the waist portion W is covered with an outer portion 18 formed by joining two layers of the first sheet 12S and the second sheet 12H, the first portion P1 of which is strongly joined. Since the first sheet 12S and the second sheet 12H are integrated without the portion 81 and the weakly bonded portions 82 are intermittently arranged in the front-rear direction LD via the non-bonded portions 83, the outer surface feels comfortable to the touch. While being flexible, the first sheet 12S and the second sheet 12H are less likely to shift when the edge We of the waist opening WO is formed by folding the first sheet 12S and the second sheet 12H and when the product is worn. In addition, since the first sheet 12S and the second sheet 12H are strongly integrated in the vicinity of the folding position by arranging the strong joint portion 81 in the inner portion 19 including the inner edge region Ei, the first sheet The first sheet 12S and the second sheet 12S and the second sheet 12S and the second sheet 12S and the second sheet 12S and the second sheet 12S and the second sheet 12S and the second sheet 12S and the second sheet 12S and the second sheet 12S and the second sheet 12S and the second sheet 12S and the second sheet 12S and the second sheet 12S and the second sheet 12S and the second sheet 12S and the second sheet 12S and the second sheet 12S and the second sheet 12S and the second sheet 12S and the second sheet 12S and the second sheet 12S and the second sheet 12S are easily folded when the waist opening WO is folded back to form the waist opening WO. 12H becomes difficult to shift.

Further, in this case, the first sheet 12S and the second sheet 12H are formed from the lower waist portion U to the inner portion 19 of the waist portion W in the exterior bodies 12F and 12B, and the first sheet 12S and the second sheet 12H are formed between the first sheet 12S and the second sheet 12H. When both the waist elastic member 17 and the waist lower elastic member 15 are sandwiched between the two and the first sheet 12S and the second sheet 12H are welded at the above-described joining position 80, the basic structure of the exterior bodies 12F and 12B is formed by one welding process. It is preferable in that it can be constructed.

In addition, also in the examples shown in FIGS. 10 and 11, structures similar to the examples shown in FIGS. 8 and 9 can be adopted, such as providing a strong joint portion 81 in the second portion P2.

(Cover nonwoven fabric)
In a pants-type disposable diaper with an exterior that is divided into two parts, the interior body 200 is exposed between the front exterior body 12F and the rear exterior body 12B. A cover nonwoven fabric 13 covering the back surface of the inner body 200 is preferably provided from between the front outer body 12F and the inner body 200 to between the rear outer body 12B and the inner body 200 .

The nonwoven fabric used for the cover nonwoven fabric 13 is not particularly limited depending on the type of fiber and the method of binding (entangling) the fibers, for example, the same material as the material of the exterior bodies 12F and 12B can be appropriately selected. It is desirable to use an air-through non-woven fabric, and in that case, the basis weight is preferably 20 to 40 g/m ² and the thickness is preferably 0.3 to 1.0 mm. As the cover nonwoven fabric 13, a non-porous nonwoven fabric having no holes penetrating from the front to the back may be used, or a perforated nonwoven fabric having a large number of spaced holes penetrating from the front to the back 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. As shown, it extends in the front-rear direction LD from the front-rear direction middle position of the region where the front exterior body 12F and the interior body 200 overlap to the front-rear direction middle position of the region where the rear exterior body 12B and the interior body 200 overlap. good too. In the case of the example shown in FIG. 7, the longitudinal length 13y of the overlapping portion between the cover nonwoven fabric 13 and the front exterior body 12F and the longitudinal length 13y of the overlapping portion between the cover nonwoven fabric 13 and the rear exterior body 12B are Although they can be determined appropriately, they can be set to about 20 to 40 mm in normal cases.

The range in the width direction of the cover nonwoven fabric 13 is a range that can hide the rear surface exposed portion of the liquid-impermeable sheet 11 . For this reason, in the illustrated example, since the liquid-impermeable sheet 11 is exposed between the base ends of the left and right upright gathers 60 , the liquid-impermeable sheet 11 is exposed from the back side of the base end of at least one of the upright gathers 60 to the base end of the other upright gather 60 . A cover nonwoven fabric 13 is provided so as to cover the width direction range up to the back side of the part. Thereby, the liquid-impermeable sheet 11 can be concealed by the cover nonwoven fabric 13 and the gathered nonwoven fabric 62 of the rising gathers 60 . Also, instead of covering the back sides of the base ends of the raised gathers 60 at both ends of the cover nonwoven fabric 13 in the width direction, the gathers nonwoven fabric 62 may cover the back sides of both ends in the width direction of the cover nonwoven fabric 13 . It is possible to conceal the liquid-impermeable sheet 11 with the gathered nonwoven fabric 62 . In this case, both sides of the cover nonwoven fabric 13 are covered with the gathered nonwoven fabric 62 , so there is an advantage that both sides of the cover nonwoven fabric 13 are less likely to peel off from the liquid-impermeable sheet 11 .

The inner surface and outer surface of the cover nonwoven fabric 13 can be adhered to the opposing surfaces via a hot-melt adhesive. The fixed region of the cover nonwoven fabric 13 may be the entire front-rear direction and the entire width direction of the cover nonwoven fabric 13, or may be partially unfixed. For example, if both ends of the cover nonwoven fabric 13 in the width direction are not fixed, even if the side portions of the absorbent body 56 are slightly shrunk due to the influence of the rising gathers 60, they will not be easily affected, and the cover nonwoven fabric 13 will be wrinkled or folded. It has the advantage of being less likely to be In this case, the width of the non-fixed portions at both ends in the width direction of the cover nonwoven fabric 13 may be appropriately determined, and may be, for example, 3 to 10 mm, preferably 5 to 8 mm.

(internal and external joints)
Fixing of the inner body 200 to the outer bodies 12F and 12B can be performed by means of material welding such as heat sealing or ultrasonic sealing, or hot melt adhesive. In the illustrated example, the hot-melt adhesive applied to the back surface of the inner body 200, that is, the back surface of the liquid-impermeable sheet 11 and the base portion 65 of the rising gather 60 in this case, is applied to the inner surfaces of the exterior bodies 12F and 12B. is fixed. The inner and outer joints 201 and 202 for fixing the inner body 200 and the outer bodies 12F and 12B, as shown in FIG. It can also be provided in a part other than the part.

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

・"Front-back direction" means the direction (longitudinal direction) indicated by symbol LD in the figure, and "width direction" means the direction (left-right direction) indicated by WD in the figure. are orthogonal.

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

・"Front surface" means the side of the member that is closest to the wearer's skin when wearing the pants-type disposable diaper, and the "back surface" means the side that is close to the wearer's skin when wearing the pants-type disposable diaper. 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 deionized water: 97.09 wt% 1.0 g of superabsorbent polymer is added to 49.0 g of the mixture) and stirred with a stirrer. The resulting gel is left in a thermo-hygrostat at 40° C. and 60% RH for 3 hours, then returned to room temperature, and the gel strength is measured with a card meter (manufactured by I. Techno Engineering: Curdmeter-MAX ME-500).

· "Metsuke" 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 a constant weight. Pre-drying refers to making a sample or test piece constant weight in an environment at a temperature of 100°C. Fibers with an official moisture content of 0.0% do not need to be pre-dried. Using a sampling template (100 mm x 100 mm), a sample with dimensions of 100 mm x 100 mm is cut from the constant weight specimen. The weight of the sample is measured, multiplied by 100 to calculate the weight per square meter, and used as basis weight.

- "Thickness" is automatically measured using an automatic thickness gauge (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 amount of water absorption is measured according to JIS K7223-1996 "Testing method for water absorption of superabsorbent resin".

・The water absorption rate is the "time to end point" when JIS K7224-1996 "Test method for water absorption rate of superabsorbent resin" is performed using 2g of superabsorbent polymer and 50g of physiological saline. .

・The "deployed state" means a flat state without contraction (including any contraction such as contraction due to elastic members) or slack.

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

・If there is no description about environmental conditions for testing and measurement, the test and measurement shall be performed in a laboratory 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 exterior body 12E... Waist extension part 12F, 12B... Exterior body 12F... Front exterior body 12H... Second sheet 12S... First Sheet 13 Cover nonwoven fabric 15 Lower waist elastic member 17 Waist elastic member 18 Outer portion 19 Inner portion 200 Inner body 201, 202 Inner/outer joint 30 Top sheet 40 Intermediate sheet 50 Absorbent element 56 Absorbent body 58 Wrapping sheet 60 Rising gather 60A Tip side portion 60B Base side portion 62 Gathered nonwoven fabric 67 Falling portion 68 Free portion 80... Joining position 81... Strong joining part 82... Weak joining part 83... Non-joining part 90... Non-joining position A1... Non-stretch area A2... Stretch area B... Back body C... Buttock cover part , Ei... inner edge region, Eo... outer edge region, F... front body, HM... hot-melt adhesive, L... middle area, LD... longitudinal direction, LO... leg opening, P1... first part, P2... second Part, T... Waist area, U... Lower waist part, W... Waist part, WD... Width direction, WO... Waist opening.

Claims (9)

1. An annular waist region formed by joining both sides of the front body and both sides of the back body, an intermediate region extending from the waist region of the front body to the waist region of the back body through the crotch portion, A waist opening provided on the opposite side of the intermediate region in the waist region, leg openings provided on both sides in the width direction of the intermediate region, an outer body forming at least the waist region, and a front body an inner body attached to the outer body so as to extend over the back body,
   The exterior body has a waist portion defined as an end portion on the side of the waist opening,
   The waist portion includes an outer portion in which a first sheet made of nonwoven fabric and a second sheet made of nonwoven fabric are laminated, and the first sheet and the second sheet continuing from the outer portion are folded inward at the edge of the waist opening. and at least one of the sheets has an inner portion formed extending across the waist portion,
   said inner portion being joined to said outer portion;
   the waist portion has a plurality of elongated waist elastic members spaced apart from each other along the width direction between the outer portion and the inner portion;
   In the first sheet and the second sheet, a bonded position extending in the front-rear direction over the outer part and the inner part and a non-bonded position extending in the front-rear direction extending over the outer part and the inner part are alternately arranged in the width direction. provided repeatedly,
   The first sheet and the second sheet are welded and joined at the joining position,
   The outer portion has an outer edge area of 10 mm or less from the waist opening edge to the leg opening side, and the inner portion has an inner edge area of 10 mm or less from the waist opening edge to the leg opening side. death,
   The outer portion of the waist portion has a first portion located on the waist opening side from the middle in the front-rear direction and including the outer edge region and a second portion located on the opposite side,
   the waist portion has at least one waist elastic member at a position overlapping the first portion and the second portion;
   In the joint positions over the outer edge region and the inner edge region, a strong joint portion having relatively high joint strength is arranged at one location, and weak joint portions having relatively low joint strength are arranged at other portions. At least one of the joint portion and the non-joint portion is arranged,
   At the bonding positions in the region of the first portion excluding the outer edge region and the region of the inner portion excluding the inner edge region, the weakly bonded portion extends in the front-rear direction through the non-bonded portion. distributed intermittently,
   A pants-type disposable wearing article characterized by:
2. In the joint position extending over the outer edge region and the inner edge region, the strong joint is arranged at one portion of the inner edge region, and the weak joint and the non-joint portion are arranged in other portions. at least one of
   The pants-type disposable wearing article according to claim 1.
3. The strong joint provided at one of the joint positions in the inner edge region and the waist elastic member located closest to the waist opening do not overlap,
   The pants-type disposable wearing article according to claim 2.
4. At the joint position in the second portion, strong joints with relatively high joint strength are intermittently arranged in the front-rear direction via at least one of weak joints with relatively low joint strength and non-joined parts. ing,
   The pants-type disposable wearing article according to any one of claims 1 to 3.
5. The strong joint located closest to the waist opening in the second portion is obtained by dividing the region between the waist elastic member closest to the waist opening and the waist elastic member closest to the leg opening into three equal parts in the front-rear direction. Located in the central region of the
   The pants-type disposable wearing article according to claim 4.
6. The outer body of the waist portion has a lower waist portion continuing to the leg opening side of the waist portion,
   The lower waist portion is provided in a plurality of portions along the width direction and spaced apart from each other between the first sheet and the second sheet continuing from the outer portion and between the first sheet and the second sheet. an elongated lower waist elastic member;
   The bonded position and the non-bonded position continue from the waist portion to the lower waist portion,
   At the joint position in the lower waist portion, the strong joint portions are arranged adjacent to each other in the front-rear direction of the lower waist elastic member, and between the adjacent strong joint portions between the adjacent lower waist elastic members. Weak joints are arranged,
   The dimensions and arrangement intervals of the strong joint portions at the joint positions of the second portion are equal to the dimensions and arrangement intervals of the strong joint portions located closest to the waist opening at the joint positions of the lower waist portion.
   The pants-type disposable wearing article according to claim 4 or 5.
7. The dimension in the front-rear direction of the strong joint is 2 to 4 mm,
   The dimension in the front-rear direction of the weak joint is 1.0 to 2.0 times the dimension in the front-rear direction of the strong joint,
   The longitudinal dimension of the non-bonded portion is 0.5 to 1.2 times the longitudinal dimension of the weakly bonded portion.
   The pants-type disposable wearing article according to any one of claims 1 to 6.
8. the apparent thickness of the weakly bonded portion is 0.5 to 0.9 times the sum of the apparent thickness of the first sheet and the apparent thickness of the second sheet in the non-bonded portion;
   the apparent thickness of the strong joint is 0.5 to 0.9 times the apparent thickness of the weak joint;
   The pants-type disposable wearing article according to any one of claims 1 to 7.
9. An annular waist region formed by joining both sides of the front body and both sides of the back body, an intermediate region extending from the waist region of the front body to the waist region of the back body through the crotch portion, A waist opening provided on the opposite side of the intermediate region in the waist region, leg openings provided on both sides in the width direction of the intermediate region, an outer body forming at least the waist region, and a front body an inner body attached to the outer body so as to extend over the back body,
   The exterior body has a waist portion defined as an end portion on the side of the waist opening,
   The waist portion includes an outer portion in which a first sheet made of nonwoven fabric and a second sheet made of nonwoven fabric are laminated, and the first sheet and the second sheet continuing from the outer portion are folded inward at the edge of the waist opening. an inner portion formed extending entirely across said waist;
   said inner portion being joined to said outer portion;
   the waist portion has a plurality of elongated waist elastic members spaced apart from each other along the width direction between the first sheet and the second sheet in the inner portion;
   In the first sheet and the second sheet, a bonded position extending in the front-rear direction over the outer part and the inner part and a non-bonded position extending in the front-rear direction extending over the outer part and the inner part are alternately arranged in the width direction. provided repeatedly,
   At the joining position, the first sheet and the second sheet are welded and joined via the waist elastic member at a portion having the waist elastic member therebetween and directly at a portion not having the waist elastic member. has been
   The inner portion has an inner edge area of 5 mm or less from the edge of the waist opening to the leg opening side,
   The outer portion of the waist portion has a first portion located closer to the waist opening than the center in the front-rear direction, and a second portion located on the opposite side,
   said inner edge region having at least one said waist elastic member;
   At the joint position in the inner portion, strong joint portions having relatively high joint strength are arranged on both sides of the waist elastic member in the front-rear direction, and the adjacent strong joint portions between the adjacent lower waist elastic members are arranged. The part between is considered to be the weak joint,
   At the joint position in the first portion, the weak joint is intermittently arranged in the front-rear direction via the non-joint.
   A pants-type disposable wearing article characterized by:

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