JP7129262B2 - Elastic structure for disposable wearing article, and pants-type disposable wearing article having this elastic structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a stretchable structure for a disposable wearing article and a pants-type disposable wearing article having this stretchable structure.

In disposable wearing articles, it is common to provide an elastic structure in order to improve the fit of each part. For example, in pants-type or tape-type disposable diapers, it is widely practiced to provide the waist portion with a stretchable structure in the waist circumference direction, or the leg portion with a stretchable structure in the direction along the leg circumference. . Furthermore, it is widely practiced to provide a stretchable structure in the front and back direction called a three-dimensional gather or a flat gather (for example, patent References 1-3).

A representative stretchable structure of such a disposable wearing article includes elongated elastic members spaced apart from each other along the direction of stretching between the first nonwoven fabric layer and the second nonwoven fabric layer which overlap each other. Be prepared. The first nonwoven fabric layer and the second nonwoven fabric layer form a planar stretchable region and play a role of covering and hiding the elastic member. It plays a role in generating power for The elastic member is fixed to the first nonwoven fabric layer and the second nonwoven fabric layer at least at the portions located at both ends of the elastic region while being stretched in the elastic direction. By this fixation, the elastic member, the first nonwoven fabric layer and the second nonwoven fabric layer are integrated, and the first nonwoven fabric layer and the second nonwoven fabric layer are contracted by the contractile force of the elastic member to form folds (including wrinkles). The folds are formed not only in the natural length state but also in the state in which the elastic member is stretched (hereinafter simply referred to as folds). is expanded. Normally, the first nonwoven fabric layer and the second nonwoven fabric layer are unfolded with no folds at the limit of elastic elongation, and the folds are formed as the elastic member shrinks, and the folds are most densely formed in the natural length state.

In such a stretchable structure, when the first nonwoven layer and the second nonwoven layer are free from each other, one nonwoven layer partially or wholly floats relative to the other nonwoven layer to eliminate unwanted folds and bulges. The first nonwoven fabric layer and the second nonwoven fabric layer need to be directly or indirectly bonded over almost their entirety. In addition, since the elastic member produces stretchability, the elastic member extends over the entire stretchable region in the stretchable direction, and at least portions located at both ends of the stretchable region in the stretchable direction are the first nonwoven fabric layer and the second nonwoven fabric layer. It is necessary that the first nonwoven fabric layer and the second nonwoven fabric layer are shrunk in accordance with the shrinkage of the elastic member in the natural length state. That is, it is necessary to bond the first nonwoven fabric layer and the second nonwoven fabric layer and to fix the elastic member to the first nonwoven fabric layer and the second nonwoven fabric layer.

Currently, hot melt adhesives are most often the means of choice for securing elastic members to the first and second nonwoven layers. On the other hand, the joining form between the first nonwoven fabric layer and the second nonwoven fabric layer is often performed by welding such as ultrasonic welding in order to reduce the amount of hot melt adhesive used. The form performed by is also firmly used. For example, by joining the first nonwoven fabric layer and the second nonwoven fabric layer via a hot-melt adhesive at the passage position of the elastic member, the joining of the first nonwoven fabric layer and the second nonwoven fabric layer and the first nonwoven fabric layer and the second nonwoven fabric layer Besides fixing the elastic member to the nonwoven fabric layer, the first nonwoven fabric layer and the second nonwoven fabric layer are intermittently interposed in the stretching direction and continuous in the direction perpendicular to the stretching direction. and a form in which the first nonwoven fabric layer and the second nonwoven fabric layer are joined through a hot-melt adhesive intermittently arranged in the direction perpendicular to the stretch direction and substantially continuous in the stretch direction. It is (See Patent Documents 1 to 6)

On the other hand, it has been proposed to provide holes penetrating in the thickness direction in the first nonwoven fabric layer and the second nonwoven fabric layer, mainly to improve breathability (see, for example, Patent Documents 7 to 9).

Among these, the ones described in Patent Documents 7 and 8 are the bonding of the first nonwoven fabric layer and the second nonwoven fabric layer with an adhesive applied in a spiral or stripe pattern on the entire surface of one of the nonwoven fabric layers, and the first nonwoven fabric layer. and fixing the elastic member to the second nonwoven fabric layer. Formation of holes in the first nonwoven fabric layer and the second nonwoven fabric layer is carried out by melting, cutting, or punching before or after joining the first nonwoven fabric layer and the second nonwoven fabric layer.

In Patent Documents 7 and 8, when the adhesive pattern is spiral, the first nonwoven fabric layer and the second nonwoven fabric layer are bonded on the entire surface, so the air permeability in areas other than the holes is reduced, and the flexibility is improved. may also decrease (rigidity may increase). Therefore, from the viewpoint of air permeability and flexibility, the adhesive pattern is desirably a striped pattern in which application lines extending in a direction orthogonal to the stretching direction are repeatedly provided at intervals in the stretching direction. It is desirable that the width of the applied line is as narrow as possible. Furthermore, when the bonding pattern is striped, the sheet joints where the first nonwoven fabric layer and the second nonwoven fabric layer are bonded form continuous grooves in the direction perpendicular to the stretching direction, and the non-bonded portions between the grooves are the first. The first non-woven fabric layer and the second non-woven fabric layer swell in opposite directions (to the front and back sides) to the same degree to form pleats. The same applies when the adhesive pattern is staggered. In this case, since the part between the folds and the inner space of the folds are continuous in the direction perpendicular to the stretching direction, not only is the air permeability in the direction perpendicular to the stretching direction excellent, but also the appearance is favorable due to the formation of aligned folds. become a thing.

However, in perforated nonwoven fabrics in which holes penetrating in the thickness direction are arranged, the portions having the holes are weak and easily bent. There is a risk of loss.

For example, when a hole is provided only in the center in the stretch direction between adjacent sheet joints, folds formed in a contracted state such as a natural length state tend to be sharply bent at the center in the stretch direction and have an inverted V shape. . However, when using a nonwoven fabric in which holes penetrating in the thickness direction are previously formed, it is difficult to precisely align the positions of the sheet joints with the positions of the holes. There is a risk that the pleats will tilt to one side and spoil the aesthetic appearance. Another problem is that the V-shaped folds have a sharp tip and feel hard to the touch.

Furthermore, when the holes are arranged in a zigzag pattern between the adjacent sheet joints, the folds formed in the contracted state such as the natural length state have a wavy shape because the easy-to-break portion changes in the orthogonal direction. , and there is a risk of impairing the aesthetic appearance.

JP-A-2004-229857 JP 2013-132331 A JP 2014-207973 A JP 2017-064126 A JP 2017-064133 A JP 2017-164034 A JP 2015-107223 A JP 2015-128573 A JP 2015-192862 A

Therefore, the main object of the present invention is to suppress deterioration of the appearance of folds in a stretchable structure of an absorbent article using perforated nonwoven fabric.

The elastic structure of the disposable wearing article that solves the above problems is as follows.
<First Aspect>
A first nonwoven fabric layer and a second nonwoven fabric layer partially or wholly overlapping each other, and a space between the first nonwoven fabric layer and the second nonwoven fabric layer in a direction orthogonal to the stretch direction, along the stretch direction. and a plurality of elongated elastic members extending along the
The elastic member is fixed to the first nonwoven fabric layer and the second nonwoven fabric layer at least at both ends in the stretching direction of the stretchable region,
The elastic region has a sheet joint portion in which the first nonwoven fabric layer and the second nonwoven fabric layer are joined by adhesion or welding,
At least one of the first nonwoven fabric layer and the second nonwoven fabric layer is a perforated nonwoven fabric in which holes penetrating in the thickness direction are arranged,
In the elastic structure of the disposable wearing article,
The arrangement of the holes is such that rows of holes that are linearly arranged at intervals in the orthogonal direction are arranged at intervals in the stretching direction,
The adhesion or welding is intermittent in the stretching direction and continuous or intermittent in the orthogonal direction,
Between the sheet joints in the stretch direction is a non-joint portion where the first nonwoven fabric layer and the second nonwoven fabric layer are not joined,
The perforated nonwoven fabric includes, in each of the non-bonded portions, a first row of holes closest to the sheet-joint portion, a second row of holes closest to the sheet-joint portion, and and one or more third rows of holes located therebetween;
The distance between the first row of holes and the sheet joint portion adjacent thereto in the direction of expansion and contraction is defined as a first distance, and the expansion and contraction between the second row of holes and the sheet joint portion adjacent thereto is defined as a first distance. When the directional interval is defined as the second interval, the difference between the first interval and the second interval is equal to or less than the dimension of the hole in the expansion and contraction direction.
An elastic structure for a disposable wearing article characterized by:

(Effect)
In this elastic structure, the sheet joints are formed by intermittent bonding or welding in the elastic direction and continuous or intermittent pattern in the orthogonal direction. Therefore, in this stretchable structure, when it is contracted to some extent, including the natural length state, the sheet joint part becomes a continuous groove in the direction perpendicular to the stretch direction, and the non-bonded part between the grooves is the first nonwoven fabric layer and the second nonwoven fabric layer. The nonwoven fabric layers bulge in opposite directions (both sides) to the same degree to form pleats.

Perforated nonwoven fabrics tend to bend at the perforated portions. Therefore, if the arrangement of holes is based on a straight row of holes as in the present stretchable structure, and if there are three or more rows of holes in each fold, the shape of the folds will be the same as in the case of a single row of holes. It does not have a sharp inverted V shape, but a gently curved shape. Furthermore, the perforated nonwoven fabric of this elastic structure has a row of holes located closest to the sheet joint (thus not including those that contact or overlap the sheet joint) in each non-joined portion and the sheet joint adjacent to this. The difference between the gaps (the first gap and the second gap) is small, and is equal to or less than the dimension in the expansion and contraction direction of the hole. For this reason, the base portions (portions corresponding to the first spacing and the second spacing) that support the folds are substantially symmetrical about the center in the stretching direction, and folds with a well-proportioned appearance are formed.

In addition, in this stretchable structure, each fold has three or more rows of holes, so air permeability between the space between the first nonwoven fabric layer and the second nonwoven fabric layer in each fold and the outside is improved.

In order for the welding to be performed continuously in the direction orthogonal to the stretching direction, as long as the welding marks on at least one of the first nonwoven fabric layer and the second nonwoven fabric layer are continuous, the intersection position of the welding process and the elastic member The first nonwoven fabric layer and the second nonwoven fabric layer are welded to the elastic member, respectively, and the first nonwoven fabric layer and the second nonwoven fabric layer are indirectly welded, so that the welding is not only continuous, but also the welding process and the elastic member. Also included is a form in which the welding between the first nonwoven fabric layer and the second nonwoven fabric layer is discontinuous because the elastic member is interposed at the crossing position.

<Second Aspect>
the row of the third holes includes a row located in the center of the non-bonded portion in the direction of expansion and contraction,
The arrangement of the holes in each non-joint portion is line symmetrical with respect to the center of the expansion and contraction direction in each non-joint portion.
The elastic structure of the disposable wearing article of the first aspect.

(Effect)
By adopting the hole arrangement of this stretchable structure, the centers of the folds are less likely to shift, and the folds extend linearly in the orthogonal direction, which is preferable because it tends to be neatly arranged.

<Third Aspect>
The diameter of each hole in the perforated nonwoven fabric decreases from the side opposite to the opposing nonwoven fabric layer side toward the opposing nonwoven fabric layer side,
The elastic structure of the disposable wearing article of the first or second aspect.

(Effect)
As in this stretchable structure, when the diameter of the holes decreases from the side opposite to the opposing nonwoven fabric layer side toward the opposing nonwoven fabric layer side, the holes and the vicinity of the holes have a surface opposite to the opposing nonwoven fabric layer. It is easy to fold so that it becomes a valley fold. This foldability is opposite to the direction in which the perforated nonwoven fabric bends during the formation of the pleats. Therefore, although the perforated nonwoven fabric tends to bend at the portion having the holes, the tendency is weakened, so the influence of the arrangement of the holes on the shape of the folds is reduced, and the pleats having a large number of holes have a more regular appearance. becomes.

The diameter of the hole means the dimension in the direction passing through the center of gravity of the hole and perpendicular to the expansion/contraction direction (therefore, in the case of a circle, it is the diameter, and in the case of an ellipse, it is the major axis).

<Fourth Aspect>
wherein the orthogonal spacing of the holes in the row of holes is 3 to 20 times the orthogonal dimension of the holes;
The elastic structure of the disposable wearing article according to any one of the first to third aspects.

(Effect)
When manufacturing this stretchable structure using a ready-made perforated nonwoven fabric, the linear portion that has been partly bonded or welded overlaps the row of holes, so that the first A large number of gaps may be formed where the nonwoven layer and the second nonwoven layer are not joined. The same applies to the case where the center spacing of the sheet joints in the direction of expansion and contraction differs from the center spacing of the rows of holes in the direction of expansion and contraction. Here, if the spacing of the holes in the row of holes in the orthogonal direction is narrower than the dimension of the holes in the orthogonal direction, the sheet joint portion will be in the form of a dotted line intermittent through a long missing portion, or a long concave shape on the edge of the sheet joint portion. A large number of missing portions are formed. When the sheet joint portion is largely missing in this way, the side edges of the folds are likely to have large irregularities, and the adjacent folds are likely to partially merge, making it difficult to obtain a straight and neat appearance. In addition, if the sheet-bonded portion has a missing portion, the sheet-bonded portion is more likely to separate than simply reducing the area of the sheet-bonded portion due to stress concentration and the like.

On the other hand, if the spacing between the holes in the row of holes in the orthogonal direction is sufficiently wider than the dimension of the holes in the orthogonal direction, even if a missing portion is formed in some of the sheet joints, Since the proportion of the missing portion in the direction is less than half, the adverse effect of the missing portion on the shape of the folds and the strength of the sheet joint portion can be reduced.

<Fifth Aspect>
does not have a hole that overlaps with the portion subjected to the adhesion or welding process;
The elastic structure of the disposable wearing article according to any one of the first to fourth aspects.

(Effect)
In this stretchable structure, the part that has been glued or welded to form the sheet joint (in the case of adhesive, it is the part where the adhesive is applied, and in the case of welding, it is the melted part of the material to be welded). does not have As a result, since the sheet joining portion does not have a missing portion as described above, the missing portion has substantially no adverse effect on the shape of the folds and the strength of the sheet joining portion.

<Sixth Aspect>
The hole has a dimension in the stretching direction of 0.3 to 3.0 mm and a dimension in the orthogonal direction of 0.3 to 5.0 mm,
the orthogonal spacing of the holes in the row is 2.5 to 10.0 mm;
The interval in the expansion and contraction direction of the row is 1.0 to 5.0 mm,
The dimension of the sheet joint portion in the stretching direction is 0.5 to 4 mm,
The interval between the sheet joints in the stretching direction is 4 to 8 mm,
The elastic structure of the disposable wearing article according to any one of the first to fifth aspects.

(Effect)
The arrangement of the holes and the sheet joints can be determined as appropriate, but is preferably within the scope of this aspect.

<Seventh Aspect>
Of the first nonwoven fabric layer and the second nonwoven fabric layer, the nonwoven fabric layer on the wearer's skin side is a nonporous nonwoven fabric, and the opposite nonwoven fabric layer is the perforated nonwoven fabric.
The elastic structure of the disposable wearing article according to any one of the first to sixth aspects.

(Effect)
By using non-porous non-woven fabric for the non-woven fabric layer on the skin side, the influence of the pores on the touch can be eliminated. In addition, since only one of the first nonwoven fabric layer and the second nonwoven fabric layer has holes, the skin is not exposed when worn, and leakage through the holes can be prevented.

<Eighth Aspect>
An integrated outer body extending from the front body to the back body, or an outer body provided separately on the front body and the back body, and an inner body attached to the middle part in the width direction of the outer body and extending over both front and rear sides of the crotch part. , a side seal portion in which both side portions of the exterior body of the front body and both side portions of the exterior body of the back body are respectively joined, a waist opening and a pair of left and right leg openings,
The elastic structure of any one of the first to seventh aspects, wherein the outer body in at least one of the front body and the back body extends over a width direction range corresponding to between the side seal portions in at least a partial range in the front-rear direction. is provided so that the stretching direction of the stretching region is the width direction,
A pants-type disposable wearing article characterized by:

(Effect)
The stretchable structure described above is suitable for the exterior body of a pants-type disposable wearing article.

ADVANTAGE OF THE INVENTION According to this invention, in the stretchable structure of the absorbent article using a perforated nonwoven fabric, the advantage of being able to prevent the deterioration of the appearance of a pleat is brought about.

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 (with holes omitted) 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. 2 is a plan view showing the outer surface of the pants-type disposable diaper in an unfolded state; (a) 4-4 cross-sectional view of FIG. 8, and (b) 5-5 cross-sectional view of FIG. FIG. 4 is a plan view showing an example of arrangement of holes; FIG. 4 is a plan view showing an enlarged main part of the exterior body in the unfolded state; 11, (b) a cross-sectional view taken along line 7-7 in FIG. 11, and (c) a cross-sectional view in a contracted state, showing the main part. FIG. 4 is a plan view showing an enlarged main part of the exterior body in the unfolded state; 13, (b) a cross-sectional view taken along line 7-7 in FIG. 13, and (c) a cross-sectional view in a contracted state, showing the main part. FIG. 3 shows (a) a cross-sectional view in an orthogonal direction in an unfolded state, (b) a cross-sectional view in an expansion/contraction direction in an unfolded state, and (c) a cross-sectional view in a contracted state in a width direction. FIG. 4 is a plan view showing an enlarged main part of the exterior body in the unfolded state; FIG. 4 is a plan view showing an enlarged main part of the exterior body in the unfolded state; It is an enlarged cross-sectional view of a perforated nonwoven fabric. (a) is a front view showing the outer surface of main parts of the exterior body in a state of natural length;

An example of a pants-type disposable diaper will be described in detail below with reference to the accompanying drawings. A dot pattern portion in the cross-sectional view indicates an adhesive as a joining means for joining each constituent member positioned on the front side and the back side thereof. The hot melt adhesive is applied by known methods such as slot coating, continuous line or dotted line bead coating, spiral or Z-shaped spray coating, or pattern coating (transfer of hot melt adhesive by letterpress method). can be applied. 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 joining means for joining each constituent member, a means by material welding such as heat sealing or ultrasonic sealing can be used.

The pants-type disposable diaper shown in FIGS. 1 to 6 includes a front outer body 12F constituting a front body F, a rear outer body 12B constituting a back body B, and a rear outer body 12F from the front body 12F through the crotch portion. and an interior body 200 provided inside the exterior bodies 12F and 12B so as to extend to the body 12B. Both sides of the front exterior body 12F and both sides of the rear exterior body 12B are joined to form side seal portions 12A. As a result, the opening formed by the front and rear end portions of the exterior bodies 12F and 12B becomes a waist opening WO through which the wearer's torso passes, and the lower edges of the exterior bodies 12F and 12B and the interior body 200 on both sides in the width direction of the interior body 200. The portions surrounded by the side edges are leg openings LO through which the legs are passed. The inner body 200 is a part that absorbs and holds excrement such as urine, and the outer bodies 12F and 12B are parts that support the inner body 200 against the wearer's body. Symbol Y in the figure indicates the total length of the diaper in the unfolded state (the length in the front-rear direction from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the back body B), and the symbol X indicates the diaper in the unfolded state. It shows the full width of the diaper.

In addition, the pants-type disposable diaper has a waist region T defined as a front-rear direction range (a front-rear direction range from the waist opening WO to the upper ends of the leg openings LO) having the side seal portions 12A, and a portion forming the leg openings LO. It has an intermediate region L defined as a front-back direction range (between a front-back direction region having the side seal portions 12A of the front body F and a front-back direction region having the side seal portions 12A of the back body B). The waist region T can be divided into a “waist portion” W conceptually forming the edge of the waist opening and a “lower waist portion” U below this. Usually, when there is a boundary where the elastic stress in the width direction WD changes in the waist region T (for example, the thickness or elongation rate of the elastic member changes), the waist opening WO side is the waist opening WO side of the boundary closest to the waist opening WO side. If there is no such boundary, the waist portion W is on the waist opening WO side of the absorber 56 or the inner body 200 . The length in the front-rear direction differs depending on the size of the product and can be determined as appropriate. For example, the waist portion W can be 15 to 40 mm, and the lower waist portion U can be 65 to 120 mm. On the other hand, both side edges of the intermediate region L are constricted in a U-shape or curvilinear shape along the circumference of the wearer's leg, and this is a portion into which the wearer's leg is inserted. As a result, the unfolded pants-type disposable diaper has a substantially hourglass shape as a whole.

(internal and external joints)
Fixing of the inner body 200 to the outer bodies 12F and 12B is not particularly limited, and can be performed, for example, with a 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/outer joints 201 for fixing the inner body 200 and the outer bodies 12F and 12B can be provided almost entirely in the region where the two overlap. can.

(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 non-woven fabrics and porous plastic sheets. In addition, among these, the nonwoven fabric is not particularly limited as to what the raw material fibers are. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters, and polyamides, regenerated fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of these. etc. can be exemplified. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of processing methods include known methods such as spunlace, spunbond, thermal bond, meltblown, needle punch, air through, and point bond methods. For example, if flexibility and drapeability are desired, the spunbond method and spunlace method are preferable, and if bulkiness and softness are desired, the air through method, point bond method, and thermal bond method are preferable processing methods. .

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 at the side edges of the absorbent element 50 , or may protrude laterally from 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 not only transfers the liquid to the absorbent body quickly to improve the absorption performance of the absorbent body, but also prevents the absorbed liquid from returning from the absorbent body to keep the top sheet 30 dry at all times. can be in a state of 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 20-80 g/m ² , more preferably 25-60 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 form is shorter than the width of the absorbent body 56 and arranged in the center, but may be provided over the entire width. The longitudinal length of the intermediate sheet 40 may be the same as the entire 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 liquid-impermeable sheet without using a plastic film can also be used as the liquid-impermeable sheet 11 .

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 are for preventing side leakage, extend along both sides of the inner body 200 over the entire front-rear direction LD, and stand up from the sides of the inner body 200 to the front side. The raised gathers 60 in the illustrated example have a root side portion that stands obliquely toward the center in the width direction, and a tip side portion that stands obliquely toward the outside in the width direction from the middle portion, but are 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 extending to the center in the width direction, and a tip side portion that is folded back at the tip of the root side portion and extends to the outside 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 adopted. 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.

(absorbing element)
Although the absorbent element 50 is not particularly limited, it has an absorbent body 56 and a packaging sheet 58 that wraps the absorbent body 56 in its entirety in this example. 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. It is preferable to disperse and hold superabsorbent polymer particles in the absorbent body 56 .

The absorbent body 56 may have a rectangular shape, but as shown in FIG. 7, it has a front end, a rear end, and a constricted portion 56N positioned between them and narrower than the front and rear ends. The hourglass shape is preferable because the absorber 56 itself and the sit-up gathers 60 fit better around the legs.

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. . Reference numeral 56X indicates the 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 for this type of disposable diaper can be used as they are.

Materials for the superabsorbent polymer particles may be used without any particular limitation, but those having 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.

As the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more 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 exterior bodies 12F and 12B are composed of a front exterior body 12F that constitutes the front body F and a rear exterior body 12B that constitutes the back body B. The front exterior body 12F and the rear exterior body 12B are not continuous on the crotch side and are spaced apart in the front-rear direction LD (exterior split type). This separation distance 12d can be set to about 40 to 60% of the total length Y, for example. Further, as shown in FIGS. 8 and 9, the outer body 12 may be an integral body extending from the front body F to the back body B through the crotch (exterior integrated type).

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. It is preferable that the cover nonwoven fabric 20 covering the back surface of the inner body 200 is 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 material of the cover nonwoven fabric 20 is not particularly limited, and can be, for example, the same material as the outer nonwoven fabric layer 12S or the inner nonwoven fabric layer 12H of the exterior body 12 (perforated nonwoven fabric layer or non-porous nonwoven fabric layer, which will be described later). . The range in the front-rear direction of the cover nonwoven fabric 20 is not particularly limited as long as it has a portion overlapping the front exterior body 12F and the rear exterior body 12B, and extends in the front-rear direction LD from the front end to the rear end of the interior body 200. As shown in FIG. 7, from the front-rear middle position of the region where the front exterior body 12F and the interior body 200 overlap to the front-rear middle position of the region where the rear exterior body 12B and the interior body 200 overlap. may extend in the front-rear direction LD.

The outer bodies 12F and 12B have a waist portion corresponding to the waist region T in the front-rear direction. In this embodiment, the front exterior body 12F does not have a portion corresponding to the intermediate region L, but the rear exterior body 12B has a buttock cover portion C extending from the waist region T toward the intermediate region L side. is doing. Although not shown, the front exterior body 12F may also be provided with an inguinal cover portion extending from the waist region T toward the intermediate region L side, or may be provided with an inguinal cover portion but not with a buttock cover portion. It is not necessary to provide a portion corresponding to the intermediate region L on both sides of the rear exterior body 12B. In the illustrated example, the lower edge of the buttock cover portion C is formed in a straight line along the width direction WD similarly to the lower edge of the front exterior body 12F, but is positioned closer to the waist opening as it goes outward in the width direction. It can also be a curve that

The outer bodies 12F, 12B have an outer nonwoven fabric layer 12S and an inner nonwoven fabric layer 12H, as shown in FIGS. Needless to say, one of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H corresponds to the first nonwoven fabric layer of the present invention, and the other corresponds to the second nonwoven fabric layer of the present invention. The outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are formed by folding a single sheet material so that the crease is located on the waist opening side as shown in FIG. It can also be formed by pasting together the sheet materials. Also, the innermost portion 12r of these sheet members can be extended to the end of the inner body 200 on the side of the waist opening WO (see the example of FIG. 9). Moreover, at least one of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H may be formed of a sheet material that is partly different from the other part.

The constituent fibers of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H 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). In addition, regenerated fibers such as rayon and cupra, natural fibers such as cotton, and the like can be selected without particular limitation, and these can also be mixed and used. In order to increase the flexibility of the nonwoven fabric layers 12S and 12H, it is preferable to use crimped fibers as the constituent fibers. In addition, even if the constituent fibers of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are hydrophilic fibers (including those made hydrophilic by a hydrophilic agent), hydrophobic fibers or water-repellent fibers ( (including water-repellent fibers that have become water-repellent). 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), etc. Any of these nonwoven fabrics can be used as the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H. can be done.

The fineness and basis weight of the constituent fibers of the outer non-woven fabric layer 12S and the inner non-woven fabric layer 12H can be appropriately determined, but in general, it is preferable to be about 1.8 to 6.0 dtex and about 10 to 30 g/m ² respectively.

(About perforated nonwoven fabric)
As shown in FIGS. 2, 8, 11 and 12, at least one of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H is a perforated nonwoven fabric in which holes 14 penetrating in the thickness direction are scattered. As shown in FIGS. 11 and 12, when the inner nonwoven fabric layer 12H, which faces the wearer's skin, is a non-porous nonwoven fabric, and the outer nonwoven fabric layer 12S is a perforated nonwoven fabric, the effect of the holes 14 on the skin can be eliminated. can be done. In addition, since only one of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H has the holes 14, the skin is not exposed when worn, and leakage through the holes 14 can be prevented. Although not shown, the inner nonwoven fabric layer 12H that faces the wearer's skin may be a perforated nonwoven fabric, and the outer nonwoven fabric layer 12S may be a non-perforated nonwoven fabric. As shown in FIGS. 13 and 14, both the outer nonwoven layer 12S and the inner nonwoven layer 12H are perforated nonwovens, and the perforations 14 of one perforated nonwoven do not overlap with the perforations 14 of the other perforated nonwoven. Structures are also preferred. In this case, by forming both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H with perforated nonwoven fabrics, higher air permeability can be obtained. Moreover, since the holes 14 of one perforated nonwoven fabric do not overlap with the holes 14 of the other perforated nonwoven fabric, the skin is not exposed when worn, and leakage through the perforations 14 can be prevented. As shown in FIG. 15, both the outer nonwoven layer 12S and the inner nonwoven layer 12H are perforated nonwovens, the perforations 14 of one perforated nonwoven and the perforations 14 of the other perforated nonwoven either completely or partially. may overlap. Also, although not shown, in the case where both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are perforated nonwoven fabrics, most (for example, 50% or more of the area) of one perforated nonwoven fabric and the other perforated nonwoven fabric have holes 14. Although the holes 14 of the perforated nonwoven fabric do not overlap, the holes 14 of one perforated nonwoven fabric may partially overlap with the holes 14 of the other perforated nonwoven fabric.

The planar shape (opening shape) of each hole 14 can be determined as appropriate. The hole 14 has an elongated shape as shown in FIG. 10(b), a perfect circle as shown in FIG. 10(e), and elliptical, triangular and rectangular shapes as shown in FIGS. , a polygon such as a rhombus, a star, a cloud, or any other shape. As shown in FIG. 10(c), holes of different shapes may be mixed, but in that case, it is preferable that the dimensions in the stretching direction are almost the same, and it is more preferable that all the holes have a single shape. preferable. The dimensions of the individual holes 14 are not particularly limited, but the dimension in the orthogonal direction XD (dimension of the longest portion) 14L is preferably 0.3 to 3.0 mm, particularly 0.4 to 1.5 mm. The dimension of the ED (dimension of the longest portion) 14W is preferably 0.3 to 5.0 mm, particularly 0.6 to 2.0 mm. When the shape of the hole 14 is elongated in one direction (the total length in one direction is longer than the total length in the direction perpendicular to it) such as an elongated hole, oval, rectangle, rhombus, etc., the dimension in the longitudinal direction (the dimension of the longest portion) is preferably 1.2 to 2.5 times the dimension in the direction perpendicular thereto (the dimension of the longest portion). Further, when the shape of the hole 14 is elongated in one direction, the longitudinal direction of the hole 14 is preferably the front-rear direction LD, but may be the width direction WD or an oblique direction.

The area and area ratio of each hole 14 may be appropriately determined, but the area is preferably about 0.07 to 11.8 mm ² (especially 0.19 to 2.4 mm ² ), and the area ratio is 1.5 mm 2 . It is preferably about 0 to 15.0% (especially 5.0 to 10.0%).

The planar arrangement of the holes 14 can be appropriately determined as long as the rows of the holes 14 linearly spaced apart in the direction orthogonal to the expansion/contraction direction ED are spaced apart in the expansion/contraction direction ED. For example, as shown in FIGS. 10(a), 10(c) and 10(d), the arrangement of the holes 14 is such that the rows of the holes 14 are arranged linearly at predetermined intervals in the orthogonal direction XD at predetermined intervals in the expansion/contraction direction ED. It is preferable to form a matrix (where the positions of the holes in each row are the same in the orthogonal direction). In this case, as shown in FIG. 10(a), the interval 14x in the expansion/contraction direction ED is shorter than the interval 14y in the orthogonal direction XD. and the orthogonal direction XD, or an arrangement in which the interval 14x in the stretch direction ED is longer than the interval 14y in the orthogonal direction XD as shown in FIG. 10(d). Further, as shown in FIGS. 10(b) and 10(e), the rows of holes 14 linearly arranged at predetermined intervals in the orthogonal direction XD are spaced apart in the expansion/contraction direction ED and are displaced in the orthogonal direction XD. can be an array aligned with The example shown in FIG. 10B is a so-called staggered (hexagonal lattice) arrangement in which the holes 14 are alternately arranged in adjacent rows of the holes 14 .

The orthogonal spacing 14y and the stretch direction spacing 14x of the holes 14 may each be constant or variable. The spacing 14y in the orthogonal direction and the spacing 14x in the stretching direction of the holes 14 can be determined as appropriate. 3.0 to 5.0 mm, and 14x is preferably in the range of 1.0 to 2.0 mm.

The cross-sectional shape of the hole 14 is not particularly limited. For example, even if the hole 14 is a punched type hole whose perimeter is formed by cut ends of fibers as shown in FIG. It may be a pin-insertion type hole 14 (having a high fiber density at the edge) formed by inserting a pin between the fibers and expanding the fibers with almost no cut ends of fibers around the periphery of the hole 14 . As shown in FIG. 18(d), the punched-type hole may be one in which the diameter of the hole 14 decreases toward the middle in the thickness direction, or may decrease toward one side in the thickness direction. . The diameter of the hole 14 means the dimension in the direction passing through the center of gravity of the hole and perpendicular to the expansion/contraction direction (therefore, in the case of a circle, it is the diameter, and in the case of an ellipse, it is the major axis). Furthermore, as the diameter of the holes 14 decreases in the thickness direction, the diameter of the holes 14 continues to decrease throughout the thickness direction of the nonwoven fabric layer, and the diameter of the holes 14 does not substantially decrease in the middle of the thickness direction. is also included.

The pin insertion type hole 14 has a diameter that decreases from the pin insertion side toward the opposite side. As shown in FIGS. 18(a) and 18(c), such a pin-insertion type hole has a protrusion in which fibers are extruded to the side opposite to the pin-insertion side at the edge of the hole 14 on the side opposite to the pin-insertion side. A portion (burr) 14e is formed and no projecting portion 14e is formed on the pin insertion side, and as shown in FIG. A projecting portion 14e extruded to the opposite side is formed, and a projecting portion 14e lower than this is formed on the pin insertion side. Furthermore, in the former type of hole 14, as shown in FIG. A facing portion having the highest protruding height 14i and a facing portion facing in a direction orthogonal thereto and having the lowest protruding height 14j are included. It is desirable that the projecting portion 14e is continuous in the circumferential direction of the hole and has a cylindrical shape. good too. The heights of protrusions 14h, 14i, 14j (apparent heights measured with an optical microscope when no pressure is applied) are preferably about 0.2 to 1.2 mm. Further, the highest protrusion height 14i of the protrusion 14e is preferably about 1.1 to 1.4 times the lowest protrusion height 14j. The protrusion height of the protrusion 14 e may vary in the circumferential direction of the hole 14 .

For example, when a hole 14 having a shape elongated in one direction is formed by inserting a pin as shown in FIGS. A protruding portion (burr) 14e is formed in which the protruding height 14i of the opposed portion of the hole 14 in the longitudinal direction is higher than the protruding height 14j of the opposed portion in the direction orthogonal to the longitudinal direction. The protruding portion 14e of the hole 14 may have a lower fiber density than its surrounding portion, but preferably has a similar or higher fiber density.

The fineness, basis weight, and thickness of the constituent fibers of the perforated nonwoven fabric can be determined as appropriate, but usually about 1.8 to 6.0 dtex, about 15 to 25 g/m ² , and about 0.1 to 1.3 mm, respectively. is preferable. In addition, the bending resistance of the perforated nonwoven fabric in the MD direction (width direction) is preferably 35 to 100 mm, particularly 40 to 70 mm in a non-perforated state before perforation, and 10 to 50 mm in a perforated state. In particular, it is preferable that it is 15 to 40 mm.

(stretch area)
An elongated elastic member 19 is provided between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H in the exterior bodies 12F and 12B, forming a stretchable region A2 that elastically expands and contracts in the width direction WD as the elastic member 19 expands and contracts. ing. That is, in the elastic region A2, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H contract with the contraction of the elastic members in the natural length state, resulting in a large number of folds 80. FIG. Further, when the stretchable region A2 is stretched in the width direction WD, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are stretched to a predetermined elongation rate without the pleats 80 being completely stretched. As long as the elastic member 19 is elongated, it may be thread-like, string-like, or band-like. Moreover, as the elastic member 19, either synthetic rubber or natural rubber may be used.

The elastic member 19 is fixed to the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H at least at both ends of the elastic region A2 in the elastic direction ED. For fixing the elastic member 19, the elastic member 19 is fixed to the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H at the position of the sheet joint portion 70 as a result of forming the sheet joint portion 70 continuing in the orthogonal direction XD, which will be described later. It also includes

Although the means for fixing the elastic member 19 is not particularly limited, it is preferable to use a hot-melt adhesive 19H. For example, as shown in FIGS. 11 and 12, hot-melt adhesive 19H is intermittently applied to the outer peripheral surface of both ends of the elastic member 19 in the stretching direction ED by applying means such as a comb gun or Surewrap nozzle. This elastic member 19 can be sandwiched between the outer nonwoven layer 12S and the inner nonwoven layer 12H. In this case, the elastic member 19 is fixed to the outer non-woven fabric layer 12S and the inner non-woven fabric layer 12H at only both ends of the elastic region in the elastic direction ED via the hot-melt adhesive 19H. As shown in FIGS. 13 and 14, after the hot melt adhesive 19H is applied to the arrangement positions of both ends of the elastic member 19 in the stretching direction ED on the facing surfaces of at least one of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H. , the elastic member 19 may be sandwiched between the outer nonwoven layer 12S and the inner nonwoven layer 12H. In this case, the hot melt adhesive 19H may be continuous in the orthogonal direction XD as shown in the figure, or intermittently arranged in the orthogonal direction XD. Furthermore, in these cases, the continuous portion of the hot melt adhesive 19H may extend over a plurality of elastic members.

Moreover, although the fixing positions of the elastic members 19 may be the same throughout the stretchable region A2 in the orthogonal direction XD, a partial range intersecting with the plurality of elastic members 19 may be different. For example, the waist portion W can be fixed over the entire length of the elastic member 19 in the stretching direction ED, and the portions other than the waist portion W can be fixed only at both ends of the elastic member 19 in the stretching direction ED.

In the case of a pants-type disposable diaper as shown in the figure, it is desirable to provide the elastic member 19, that is, the elastic region at the following sites. That is, between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H in the waist portion W of the exterior bodies 12F and 12B, 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. installed. 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 in the width direction. Except for the part, it 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 1.5 mm 2 . 0 mm ² ) are preferably provided at intervals of 4 to 12 mm, and the elongation rate of the waist portion W in the width direction WD is 150 to 400%, particularly about 220 to 320%. It is preferable to have In addition, the waist portion W does not need to use the waist portion elastic member 17 having the same thickness or the same elongation rate in all of the waist portion W in the front-rear direction LD. The thickness and elongation rate may be different.

In addition, a plurality of waist lower elastic members 15 made of elongated elastic members are attached at intervals in the front-rear direction between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H in the waist lower part U of the outer bodies 12F, 12B. It is

The lower waist elastic member 15 has a thickness of about 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 1.5 mm 2 . 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 It is preferably about 240 to 300%.

In addition, a plurality of cover section elastic members 16 made of elongated elastic members are attached at intervals in the front-rear direction between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H in the buttock cover section C of the rear exterior body 12B. ing.

The cover elastic member 16 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to 1.0 mm. ² ) are preferably provided at intervals of 5 to 40 mm, particularly 5 to 20 mm, and the elongation rate of the cover portion in the width direction WD is 150 to 300%, particularly 180 to 260. % is preferred.

In the case of providing an inguinal cover portion on the front side exterior body 12F, similarly, a cover portion elastic member can be provided.

(Non-stretch area)
When the elastic members 15 and 16 are provided in the front-back direction range having the absorber 56 as in the illustrated example of the waist lower portion U and the buttocks cover portion C, the width direction WD of the absorber 56 is partially or entirely In order to prevent shrinkage, the widthwise intermediate portion (preferably including the entire inner/outer joint portion 201) 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 the widthwise direction Both sides are stretchable areas 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.

The stretchable region A2 and the non-stretchable region A1 supply elastic members 15 and 16 between the inner nonwoven fabric layer 12H and the outer nonwoven fabric layer 12S, and extend the elastic members 15 and 16 at least at both ends of the stretchable region A2 in the stretch direction ED. The elastic members 15 and 16 are fixed at one point in the middle of the width direction in the non-stretchable region A1, and the non-stretchable region A1 is not fixed. The elastic members 15 and 16 may be cut by heating, or substantially the entire elastic members 15 and 16 may be finely cut by pressurization and heating, and the elastic members 15 and 16 may be constructed by leaving the stretchability in the stretchable region A2 and eliminating the stretchability in the non-stretchable region A1. . In the former case, as shown in FIG. 4 , in the non-stretchable region A1, the cut remaining portion continuous from the elastic members 15 and 16 of the stretchable region A2 is used as the unnecessary elastic member 18 alone and shrunk to its natural length. It will remain between the layer 12S and the inner nonwoven fabric layer 12H. In the latter case, although not shown, there will be a cut residue continuous from the elastic members 15, 16 in the stretchable region A2 and a cut residue continuous with the elastic members 15, 16 in both stretchable regions A2. A cut piece of the elastic member that is not used remains alone between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H in a state of contracting to its natural length as an unnecessary elastic member.

(Joint structure of outer nonwoven fabric layer and inner nonwoven fabric layer)
As shown in FIGS. 11 and 12, the elastic region A2 has a sheet joint portion 70 in which the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are joined via the hot melt adhesive 14H. The agent 14H is applied in a striped pattern spaced apart in the stretch direction ED and continuous in the orthogonal direction XD. When the sheet joints 70 formed by the hot-melt adhesive 14H are formed at intervals in the stretching direction ED in this way, air permeability and flexibility are improved. Further, when the sheet joint portion 70 is formed by applying the hot melt adhesive 14H in a striped pattern that is spaced in the stretch direction ED and continuous in the orthogonal direction XD, including the natural length state, 19, the sheet-bonded portion 70 becomes a continuous groove in the direction orthogonal to the stretching direction ED in a state of being contracted to some extent, and the non-bonded portion 71 between the grooves is the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H. bulge in opposite directions (both front and back) to the same degree to form folds. The hot-melt adhesive 14H may be continuous over the entire stretchable region A2 in the orthogonal direction XD, but it is continuous only in a partial range (for example, only the range excluding the waist portion) that intersects the plurality of elastic members 19. may

Characteristically, as also shown in FIG. 17 , the perforated nonwoven fabric (the outer nonwoven fabric layer in the example shown in FIGS. 11 and 12 ) is attached to each of the non-bonded portions 71 in the first sheet-bonded portion 70 closest to one of the sheet-bonded portions 70 . 1 row of holes 91, a second row of holes 92 closest to the other sheet joint portion 70, and one or more rows of third holes 93 positioned therebetween. . The interval in the expansion/contraction direction ED between the first row of holes 91 and the sheet joint portion 70 adjacent thereto is defined as a first interval, and the second row of holes 92 and the sheet joint portion 70 adjacent thereto is defined as a first interval. , the difference (absolute value) between the first interval 91d and the second interval 92d is 14W or less in the expansion/contraction direction ED of the hole 14 when the interval in the expansion/contraction direction ED is the second interval. . If the arrangement of the holes 14 is based on linear rows of the holes 14 as in the stretchable structure, and three or more rows of holes 91 to 93 exist in each fold 80, the row of the holes 14 is one row. Thus, the shape of the folds 80 does not have a pointed inverted V shape, but has a gently curved shape. Furthermore, the perforated nonwoven fabric having this stretchable structure includes rows 91 and 92 of holes located closest to the sheet-bonded portion 70 (thus not including those that contact or overlap the sheet-bonded portion 70) in each non-bonded portion 71, and The gap (first gap 91d and second gap 92d) from the sheet joint portion 70 adjacent to the hole 14 is small, and the dimension of the hole 14 in the expansion/contraction direction ED is 14W or less. Therefore, the base portion (and the portion corresponding to the second spacing) supporting the folds 80 is substantially symmetrical with respect to the center in the stretch direction ED, and the folds 80 with a well-proportioned appearance are formed. In addition, in this stretchable structure, three or more rows 91 to 93 of holes 14 are present in each fold 80, so the space between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H in each fold 80 and the outside. air permeability is also improved.

The difference between the first interval 91d and the second interval 92d should be 14W or less in the expansion/contraction direction ED of the hole 14, and more preferably 1/2 or less of the 14W in the expansion/contraction direction ED of the hole 14. is, of course, particularly preferably zero. As a specific numerical value, the difference between the first spacing 91d and the second spacing 92d is preferably 3 mm or less.

Although the first spacing 91d and the second spacing 92d can be determined as appropriate, they are usually 1/10 to 1/3 times, especially 1/4 to 1/3 times the dimension of the non-bonded portion 71 in the expansion/contraction direction ED. Six times is preferred.

The row 93 of the third holes may be provided in a single row as in the illustrated example, or may be provided in a plurality of rows. The intervals in the expansion/contraction direction ED of all rows of holes 14 may be constant or may vary. In particular, the third hole row 93 includes a row located in the center of the non-bonded portion 71 in the stretch direction ED, and the arrangement of the holes 14 in each non-bonded portion 71 is such that the stretch direction ED in each non-bonded portion 71 is aligned. Axisymmetrical about the center is preferable because the center of the folds 80 is less likely to shift, and the folds 80 tend to extend linearly along the orthogonal direction XD and be neatly arranged.

Also, the diameter of each hole 14 in the perforated nonwoven fabric is said to decrease from the side opposite to the opposing nonwoven fabric layer (the inner nonwoven fabric layer 12H in the example shown in FIGS. 11 and 12) toward the opposing nonwoven fabric layer. , at and near the hole 14, the surface opposite to the facing nonwoven fabric layer tends to fold into a valley fold. This foldability is opposite the direction in which the perforated nonwoven fabric bends during the formation of the pleats 80 . Therefore, although the perforated nonwoven fabric is likely to bend at the portion having the holes 14, the tendency is weakened. , for a more tidy appearance.

When the row of holes 14 overlaps the portion where the hot melt adhesive 14H is applied to form the sheet joint 70, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are not joined to the portion to be the sheet joint 70. Many parts are formed. If the sheet joint portion 70 is missing in this way, the side edges of the folds 80 are likely to have large irregularities, and the folds 80 are likely to partially merge with the adjacent folds. . In addition, if the sheet-bonded portion 70 has a missing portion, the sheet-bonded portion 70 is more likely to peel than if the area of the sheet-bonded portion 70 is simply reduced, for reasons such as stress concentration. Therefore, as shown in FIGS. 11 and 17(a), it is preferable that the elastic structure does not have holes 14 that overlap the hot-melt adhesive 14H applied portion for forming the sheet joint portion 70. FIG. As a result, there is substantially no adverse effect on the shape of the folds 80 and the strength of the sheet joint portion 70 due to the missing portion.

Of course, as shown in FIGS. 16 and 17(b), there may be a row 94 of holes 14 that overlaps the hot-melt adhesive 14H applied portion for forming the sheet joint portion 70. FIG. In this case, it is desirable that all of the holes 14 that overlap the hot-melt adhesive 14H-applied portion are completely within the hot-melt adhesive 14H-applied portion, as in the illustrated example. If the hole 14 that overlaps the hot-melt adhesive 14H-applied portion protrudes from the hot-melt adhesive 14H-applied portion, the center of the hole 14 in the direction of expansion and contraction is the direction of expansion and contraction of the portion to which the hot-melt adhesive 14H is applied. A central location is desirable.

However, when manufacturing the elastic structure using a ready-made perforated nonwoven fabric, accurate positioning is difficult, so it is unavoidable that some bond lines and rows of holes 14 overlap. It is difficult to reliably avoid the formation of voids. Therefore, the reason why the interval 14y of the holes 14 in the orthogonal direction XD in the row of the holes 14 is wider than the dimension 14L of the holes 14 in the orthogonal direction XD, particularly 3 to 20 times the dimension 14L of the holes 14 in the orthogonal direction XD is preferable. As a result, even if a missing portion is formed in a part of the sheet joints 70, the ratio of the missing portion in the orthogonal direction XD of the sheet joining portion 70 is less than half. , and the strength of the sheet joint 70 can be reduced. A more preferable range is that the spacing 14y of the holes 14 in the orthogonal direction XD in the row of the holes 14 is 3 to 10 times the dimension 14L of the holes 14 in the orthogonal direction XD.

It is also preferable that the spacing 14y of the holes 14 in the row of the holes 14 in the orthogonal direction XD is equal to or greater than the spacing 19y of the elastic members 19 in the orthogonal direction XD. As a result, there is only one or less holes 14 in each row in all the regions between the adjacent elastic members 19, so there is little change in the ease of bending depending on the presence or absence of the holes 14, and the pleats are even more regular. 80 is easily formed.

Further, although the specific dimensions and arrangement of the holes 14 and the sheet joints 70 can be determined as appropriate, they are particularly preferably within the following ranges.
Dimension 14W of the expansion/contraction direction ED of the hole 14: 0.3 to 3.0 mm (especially 1.0 to 1.5 mm)
Dimension 14L in orthogonal direction XD of hole 14: 0.3 to 5.0 mm (especially 1.0 to 2.0 mm)
Interval 14y in the orthogonal direction XD of the holes 14 in the row: 2.5 to 10.0 mm (especially 3.0 to 5.0 mm)
Spacing 14x in the expansion/contraction direction ED of the row: 1.0 to 5.0 mm (especially 1.0 to 2.0 mm)
Sheet joint dimension 70w in the stretching direction: 0.5 to 4 mm (especially 1.0 to 2.0 mm)
Sheet joint interval 70y in the stretching direction (equal to the dimension of the non-joining portion 71 in the stretching direction ED): 4 to 8 mm (especially 6 to 8 mm)
Interval 19y in orthogonal direction XD of elastic member 19: 5 to 10 mm

The holes 14 and the sheet joints 70 can be provided only in the stretchable area A2, but can be provided over a wider area including the non-stretchable area A1 as in the examples shown in FIGS.

The sheet joint portion 70 in the above example is a portion where the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are joined via the hot-melt adhesive 14H, and is a portion where the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are welded. There may be. That is, when forming the sheet joint portion 70, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H may be welded in a striped pattern spaced apart in the stretch direction ED and continuous in the orthogonal direction XD. In this case, the elastic member 19 and the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H may or may not be welded at the passage position of the elastic member 19 . In any event, in order to fuse the outer nonwoven layer 12S and the inner nonwoven layer 12H with the elastic member 19 interposed, the melted portions of the outer nonwoven layer 12S and the inner nonwoven layer 12H are separated from the outer nonwoven layer 12S and the inner nonwoven layer 12H. 12H are continuous in the orthogonal direction XD.

Also, the pattern of adhesion or welding (pattern of sheet joints) may be a pattern that is intermittent in both the stretching direction and the orthogonal direction, such as a zigzag pattern.

<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.

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

・"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.

• "Center" with respect to a closed planar shape means the center of gravity in the case of a figure that does not have a center.

・"Area ratio" means the ratio of the target portion to the unit area, and is expressed as a percentage by dividing the total area of the target portion (e.g., holes) in the target region (e.g., nonwoven fabric) by the area of the target region. be. In a form in which a large number of target portions are provided at intervals, it is desirable to determine the area ratio by setting the target region to a size that includes 10 or more target portions. For example, the pore area ratio can be measured by using, for example, VHX-1000 (trade name) manufactured by KEYENCE Co. under the following procedure under the measurement condition of 20 times.
(1) Set on a 20x lens and adjust the focus. Adjust the position of the non-woven fabric so that there are 4×6 holes.
(2) Designate the brightness of the area of the hole and measure the area of the hole.
(3) Click the color extraction of "area measurement" of "measurement/comment". Click on the part of the hole.
(4) Click "Batch measurement", check "Display measurement result window", and save as CSV data.

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

- "Matsuke" 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 .

- "Bending resistance" means "8.21.1 Method A (45° cantilever method)" of JIS L 1096:2010 "Testing methods for fabrics and knitted fabrics". The value before perforation processing (non-perforated non-woven fabric) in perforated non-woven fabric is the same non-woven fabric except for the presence or absence of holes (fiber composition, fineness, basis weight, thickness, etc.) shall be prepared and measured.

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

- "Unfolded state" means a flat unfolded state without contraction 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.

INDUSTRIAL APPLICABILITY The present invention can be used for general disposable wearing articles such as underpants-type disposable diapers, tape-type disposable diapers, pad-type disposable diapers, disposable swimsuits, diaper covers, sanitary napkins, and the like.

DESCRIPTION OF SYMBOLS 11... Liquid impermeable sheet, 12... Exterior body, 12A... Side seal part, 12B... Rear exterior body, 12F... Front exterior body, 12H... Inner nonwoven fabric layer, 12S... Outer nonwoven fabric layer, 14... Hole, 14e... Protruding portion 18 Unnecessary elastic member 19 Elastic member 14H, 19H Hot melt adhesive 20 Cover nonwoven fabric 200 Inner body 201 Internal/external joint 30 Top sheet 40 Intermediate sheet 50 Absorption element 56 Absorbent body 58 Wrapping sheet 60 Standing gather 62 Gathered nonwoven fabric A1 Non-stretchable region A2 Stretchable region C Buttocks cover L Intermediate region LD Back-and-forth direction , LO... leg opening, T... waist area, U... lower waist part, W... waist part, WD... width direction, WO... waist opening, 70... sheet joining part, 71... non-joining part, XD... orthogonal direction, ED... Stretch direction, 80... Fold, 91... First row of holes, 92... Second row of holes, 93... Third row of holes, 91d... First spacing, 92d... Second spacing.

Claims (6)

A first nonwoven fabric layer and a second nonwoven fabric layer partially or wholly overlapping each other, and a space between the first nonwoven fabric layer and the second nonwoven fabric layer in a direction orthogonal to the stretch direction, along the stretch direction. and a plurality of elongated elastic members extending along the
The elastic member is fixed to the first nonwoven fabric layer and the second nonwoven fabric layer at least at both ends in the stretching direction of the stretchable region,
The elastic region has a sheet joint portion in which the first nonwoven fabric layer and the second nonwoven fabric layer are joined by adhesion or welding,
At least one of the first nonwoven fabric layer and the second nonwoven fabric layer is a perforated nonwoven fabric in which holes penetrating in the thickness direction are arranged,
In the elastic structure of the disposable wearing article,
The arrangement of the holes is such that the rows of holes arranged linearly at intervals in the orthogonal direction are arranged at intervals in the expansion and contraction direction, and the holes overlap with the portions subjected to the adhesion or welding process. and
wherein the orthogonal spacing of the holes in the row of holes is 3 to 20 times the orthogonal dimension of the holes;
The adhesion or welding is intermittent in the stretching direction and continuous or intermittent in the orthogonal direction,
Between the sheet joints in the stretch direction is a non-joint portion where the first nonwoven fabric layer and the second nonwoven fabric layer are not joined,
The perforated nonwoven fabric includes, in each of the non-bonded portions, a first row of holes closest to the sheet-joint portion, a second row of holes closest to the sheet-joint portion, and and one or more third rows of holes located therebetween;
The distance between the first row of holes and the sheet joint portion adjacent thereto in the expansion and contraction direction is defined as a first distance, and the expansion and contraction between the second row of holes and the sheet joint portion adjacent thereto is defined as a first distance. When the directional spacing is defined as the second spacing, the difference between the first spacing and the second spacing is equal to or less than the dimension of the hole in the stretching direction.
An elastic structure for a disposable wearing article characterized by: the row of the third holes includes a row located in the center of the non-bonded portion in the direction of expansion and contraction,
The arrangement of the holes in each non-joint portion is line symmetrical with respect to the center of the expansion and contraction direction in each non-joint portion.
The elastic structure of the disposable wearing article according to claim 1. The diameter of each hole in the perforated nonwoven fabric decreases from the side opposite to the opposing nonwoven fabric layer side toward the opposing nonwoven fabric layer side,
The stretchable structure of the disposable wearing article according to claim 1 or 2. The hole has a dimension in the stretching direction of 0.3 to 3.0 mm and a dimension in the orthogonal direction of 0.3 to 5.0 mm,
the orthogonal spacing of the holes in the row is 2.5 to 10.0 mm;
The interval in the expansion and contraction direction of the row is 1.0 to 5.0 mm,
The dimension of the sheet joint portion in the stretching direction is 0.5 to 4 mm,
The interval between the sheet joints in the stretching direction is 4 to 8 mm,
The elastic structure of the disposable wearing article according to any one of claims 1 to 3 . A first nonwoven fabric layer and a second nonwoven fabric layer partially or wholly overlapping each other, and a space between the first nonwoven fabric layer and the second nonwoven fabric layer in a direction orthogonal to the stretch direction, along the stretch direction. and a plurality of elongated elastic members extending along the
The elastic member is fixed to the first nonwoven fabric layer and the second nonwoven fabric layer at least at both ends in the stretching direction of the stretchable region,
The elastic region has a sheet joint portion in which the first nonwoven fabric layer and the second nonwoven fabric layer are joined by adhesion or welding,
At least one of the first nonwoven fabric layer and the second nonwoven fabric layer is a perforated nonwoven fabric in which holes penetrating in the thickness direction are arranged,
In the elastic structure of the disposable wearing article,
The arrangement of the holes is such that rows of holes that are linearly arranged at intervals in the orthogonal direction are arranged at intervals in the stretching direction,
The adhesion or welding is intermittent in the stretching direction and continuous or intermittent in the orthogonal direction,
Between the sheet joints in the stretch direction is a non-joint portion where the first nonwoven fabric layer and the second nonwoven fabric layer are not joined,
The perforated nonwoven fabric includes, in each of the non-bonded portions, a first row of holes closest to the sheet-joint portion, a second row of holes closest to the sheet-joint portion, and and one or more third rows of holes located therebetween;
The distance between the first row of holes and the sheet joint portion adjacent thereto in the expansion and contraction direction is defined as a first distance, and the expansion and contraction between the second row of holes and the sheet joint portion adjacent thereto is defined as a first distance. When the interval in the direction is defined as the second interval, the difference between the first interval and the second interval is equal to or less than the dimension of the hole in the expansion and contraction direction,
Of the first nonwoven fabric layer and the second nonwoven fabric layer, the nonwoven fabric layer on the wearer's skin side is a nonporous nonwoven fabric, and the opposite nonwoven fabric layer is the perforated nonwoven fabric.
An elastic structure for a disposable wearing article characterized by : An integrated outer body extending from the front body to the back body, or an outer body provided separately on the front body and the back body, and an inner body attached to the middle part in the width direction of the outer body and extending over both front and rear sides of the crotch part. , a side seal portion in which both side portions of the exterior body of the front body and both side portions of the exterior body of the back body are respectively joined, a waist opening and a pair of left and right leg openings,
6. The outer body of at least one of the front body and the back body of any one of claims 1 to 5 , covering a width direction range corresponding to between the side seal portions in at least a part of the range in the front-rear direction. The elastic structure is provided so that the elastic direction of the elastic region is the width direction,
A pants-type disposable wearing article characterized by:

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