JP7129190B2 - 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 stretched state of the elastic member.) are formed, and when stretched from this contracted state against the contractile force of the elastic member, the folds are unfolded. 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. Therefore, the first nonwoven layer and the second nonwoven layer must be directly or indirectly bonded over substantially their entirety. Hereinafter, the joining portion between the first nonwoven fabric layer and the second nonwoven fabric layer is referred to as a sheet joining portion. 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 bonding 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. It is strongly 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 A double-purpose structure that also serves to fix the elastic member to the nonwoven fabric layer is widely adopted. In addition, a structure in which the first nonwoven fabric layer and the second nonwoven fabric layer are joined at intermittent sheet joints in the stretch direction and continuous in a direction perpendicular to the stretch direction (hereinafter also simply referred to as the orthogonal direction), A structure is known in which a first nonwoven fabric layer and a second nonwoven fabric layer are joined by sheet joining portions that are intermittently arranged in the orthogonal direction at positions between elastic members in the orthogonal direction and are substantially continuous in the stretch direction. there 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.

On the other hand, in the method described in Patent Document 9, after forming a joint of the first nonwoven fabric layer and the second nonwoven fabric layer by welding with a gap in the stretching direction and the direction perpendicular thereto, the joint is overlapped and a hole is formed. to form.

However, in Patent Documents 7 and 8, when the application pattern of the adhesive 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. At the same time, there is a risk that the flexibility will also decrease (rigidity will increase).

In addition, in the structures described in Patent Documents 7 and 8, the adhesive is applied in a striped pattern, and in the structure described in Patent Document 9, the sheet joints are arranged intermittently in the stretching direction. , the portions between the sheet joints in the stretching direction bulge in opposite directions to form folds. However, this elastic structure does not necessarily have sufficient softness in the natural length state. This is considered to be due to the following structural differences. That is, in this stretchable structure, folds that are thin in the stretching direction in a natural length state continue in a direction orthogonal to the stretching direction, and the tips of the folds are bent with a small radius of curvature to form folds in the material, and these folds are formed. Since the folds having the same height are closely aligned, the folds are less likely to be crushed in the thickness direction and less likely to collapse. Moreover, if the tip of the fold is bent with a small radius of curvature, the tip feels particularly hard when touched.

On the other hand, a stretchable structure having sheet joints that are intermittently arranged in the orthogonal direction and substantially continuous in the stretchable direction, such as the above-mentioned dual-purpose structure, has a soft touch in the natural length state. It has characteristics. This is considered to be due to the following structural differences. That is, if the sheet joints are substantially continuous in the stretching direction, the first nonwoven fabric layer and the second nonwoven fabric layer are integrated at each sheet joint, so that they can only be deformed along each other. As a result, the first nonwoven fabric layer and the second nonwoven fabric layer are shrunk along with the contraction of the elastic member at and near the sheet joints, including the natural length state, so that the first nonwoven fabric layer and the second nonwoven fabric layer follow each other. Folds are formed on both the front and back sides in a wavy shape like this. In addition, under this influence, even in the region between the adjacent sheet joints, the first nonwoven fabric layer and the second nonwoven fabric layer are formed so as to follow the shape of the first nonwoven fabric layer and the second nonwoven fabric layer at the sheet joint. The layers form a wavy pattern along each other, and pleats are formed on both the front and back surfaces. In addition, in such folds, not only the rigidity is improved simply by the number of nonwoven fabric layers, but also the hardness of the sheet joints and the difference in curvature between the first nonwoven fabric layer and the second nonwoven fabric layer result in gentle bending (especially in the natural length state). As a result, the texture is smooth, the texture is easy to crush in the thickness direction, and the flexibility of the texture is improved.

However, when the sheet joints are intermittently arranged in the orthogonal direction, the first nonwoven fabric layer and the second nonwoven fabric layer can be freely deformed in the regions between the adjacent sheet joints. In addition, in a perforated nonwoven fabric in which holes penetrating in the thickness direction are arranged, the portion having the holes is weak and easily bent when deformable by itself. For this reason, in a stretch structure having sheet joints that are intermittently arranged in the orthogonal direction at positions between the elastic members in the orthogonal direction and that are substantially continuous in the stretch direction, the first nonwoven layer and the second nonwoven layer When a perforated nonwoven fabric is used for at least one side, the part passing through the holes in the perforated nonwoven fabric tends to bend, so that the pleats are branched or the troughs and crests of the pleats are partially widened, resulting in an overall uniformity. It is difficult to form folds.

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

SUMMARY OF THE INVENTION Accordingly, it is a primary object of the present invention to provide a stretchable structure for a disposable wearing article, which is excellent in breathability and flexibility, and in which more regular folds are formed.

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 where the first nonwoven fabric layer and the second nonwoven fabric layer are joined,
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 sheet joints are formed in a striped pattern spaced apart in the orthogonal direction and substantially continuous in the stretching direction,
The arrangement of the holes in the stretchable structure is such that the rows of holes spaced apart in the orthogonal direction are spaced in the stretchable direction, and the diameter of the holes extends from one thickness direction to the other. A first row of holes that gradually decreases in diameter and a second row of holes in which the diameter of the holes decreases from the other to the other in the thickness direction, and are alternately repeated at predetermined center intervals in the direction of expansion and contraction. is
An elastic structure for a disposable wearing article characterized by:

(Effect)
In this stretchable structure, since the sheet joints are formed at intervals in at least the orthogonal direction orthogonal to the stretching direction, good breathability and flexibility can be ensured.

Further, the arrangement of the holes in the stretchable structure is such that the rows of holes spaced in the orthogonal direction are spaced in the stretching direction, and the first nonwoven fabric layer and the second nonwoven fabric layer are aligned in the row of the holes. It becomes easy to bend along. As a result, a series of folds are likely to be formed such that the holes become folds. The folds are less likely to branch and the troughs are less likely to be partially widened, and as a whole, neat folds extending along the rows of holes are more likely to be formed.

Here, if all of the portions having rows of holes are equally prone to bending, all rows are likely to bend in the same direction. In this case, for example, when viewed from the outer surface of either the first non-woven layer or the second non-woven layer in the state of natural length (usually in this state when the product is picked up), almost all the pores There is a possibility that the rows of the folds are hidden between the adjacent folds, making it difficult for the user to understand that the perforated nonwoven fabric is used.

On the other hand, as in this aspect, the first hole row and the second hole row having opposite diameter decreasing directions in the thickness direction are alternately repeated at a predetermined center interval in the expansion and contraction direction. When there is, the first hole row and the second hole row are likely to bend in opposite directions, and the first hole rows and the second hole rows tend to bend in the same direction. This is because in an effective nonwoven fabric having a row of holes in which the diameter of the holes decreases from one side to the other in the thickness direction, a valley fold is formed along the row of holes and on one side in the thickness direction. due to its fragility. Although perforated non-woven fabrics tend to fold along the rows of holes, the fact that there are rows of holes does not necessarily force the fabric to be mountain-folded or valley-folded. Therefore, if there are simply rows of holes, when a plurality of stretchable regions are provided, there is a risk that the rows of holes located in the mountain-folded portion will have different appearances depending on the region. Further, even if the product is the same, there is a possibility that the rows of holes positioned at the mountain folds may differ from one product to another. However, in the stretchable structure of this aspect, since the directions of the holes are opposite in the first row of holes and the second row of holes, the first row of holes and the second row of holes are bent in opposite directions, Since the first row of holes and the second row of holes are likely to bend in the same direction, these problems are less likely to occur. Therefore, the folds are more neatly arranged. Further, for example, when viewed from the outer surface of either one of the first nonwoven fabric layer and the second nonwoven fabric layer in a state of natural length, either one of the first hole row and the second hole row is positioned between the adjacent folds. Although it is hidden in the middle, ie, the valley fold portion, the other side is located in the mountain fold portion, so that the user can easily understand that the perforated nonwoven fabric is used. Moreover, although the holes are hidden between the folds when it is at its natural length, the holes are exposed when it is stretched during use. This change not only improves breathability, but also has the advantage of easily appealing to users that the product has excellent breathability due to the change in appearance.

In addition, the "arrangement of holes in the elastic structure" means the arrangement of all the holes in the first nonwoven fabric layer and the second nonwoven fabric layer. Therefore, for example, when only one of the first nonwoven layer and the second nonwoven layer is a perforated nonwoven fabric, the arrangement of the holes in the perforated nonwoven fabric is matched, but both the first nonwoven layer and the second nonwoven layer In the case of a perforated nonwoven fabric, even if the arrangement of the holes in each nonwoven fabric layer does not satisfy the conditions of this embodiment, it is sufficient that the combined arrangement of all the holes of both nonwoven fabric layers satisfies the conditions of this embodiment.
In addition, as described in Patent Document 4, the fact that the sheet joint is "substantially continuous in the stretching direction" means that the target area is at least in the direction orthogonal to the stretching direction (in the unfolded state, the first nonwoven fabric layer and the The direction parallel to the second nonwoven fabric layer and perpendicular to the elastic member) means that it is continuous (continues without interruption) as long as the sheet joint is continuous in the stretching direction (the first nonwoven fabric layer and The second nonwoven fabric layer is continuously joined in the stretch direction), and the sheet joint is intermittently arranged in the stretch direction (the first nonwoven fabric layer and the second nonwoven fabric layer are intermittently stretched in the stretch direction). is joined to).
The diameter of a 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). Furthermore, the reduction in the pore diameter in the thickness direction includes pore diameters that continue to decrease throughout the thickness direction of the nonwoven fabric layer, as well as pore diameters that do not substantially decrease in the middle of the thickness direction. .

<Second Aspect>
The first row of holes and the second row of holes each have holes of the same size and shape that are linearly arranged in the orthogonal direction at predetermined center intervals.
The elastic structure of the disposable wearing article of the first aspect.

(Effect)
When the first row of holes and the second row of holes are formed as in this aspect, the pleats are particularly likely to be neatly arranged.

<Third Aspect>
The sheet joint portion is formed of a hot-melt adhesive disposed at a portion overlapping with the elastic member,
the spacing in the orthogonal direction between the holes in the first row of holes and the second row of holes is narrower than the spacing in the orthogonal direction between the sheet joints;
The elastic structure of the disposable wearing article of the first or second aspect.

(Effect)
Such sheet joints can be produced by sandwiching an elastic member coated with a hot-melt adhesive between a first nonwoven fabric layer and a second nonwoven fabric layer, and are widely used in the field of disposable wearing articles. there is However, in this sheet joint structure, the first nonwoven fabric layer and the second nonwoven fabric layer contract together with the elastic member at the sheet joint, resulting in a dense fiber structure. Therefore, in principle, the folds are likely to be split at the sheet joining portion. On the other hand, as in this aspect, when the interval in the orthogonal direction between the holes in the first row of holes and the second row of holes is narrower than the interval in the orthogonal direction between the sheet joints, the gap between the adjacent sheet joints Since there are holes in all of the regions and the holes are arranged in rows in the direction perpendicular to the stretching direction, the influence of the holes on the formation of folds is dominant over all the regions separated by the sheet joints. As a result, even though the folds are likely to be broken at the sheet joint portion, as a whole, neat folds extending along the rows of holes are likely to be formed.

<Fourth 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 interval in the orthogonal direction between the holes in the first row of holes and the second row of holes is 1.0 to 5.0 mm;
The distance between the first row of holes and the second row of holes in the expansion and contraction direction is 2.5 to 10.0 mm,
The interval between the sheet joints in the orthogonal direction is 5 to 10 mm,
The elastic structure of the disposable wearing article according to any one of aspects 1 to 3, wherein the dimension of the sheet joint portion in the orthogonal direction is 0.5 to 5.0 mm.

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

<Fifth Aspect>
Both the first nonwoven fabric layer and the second nonwoven fabric layer are perforated nonwoven fabrics, and the first row of holes is provided in one of the first nonwoven fabric layer and the second nonwoven fabric layer, and the first nonwoven fabric layer and the other of the second nonwoven fabric layer is provided with the second row of holes,
The elastic structure of the disposable wearing article according to any one of the first to fourth aspects.

(Effect)
As in this aspect, when only one of the first nonwoven fabric layer and the second nonwoven fabric layer is provided with the first row of holes and only the other is provided with the second row of holes, the first row of holes and the second row of holes are further formed. are bent in opposite directions, and the first hole-rows and the second hole-rows are preferably bent in the same direction.

<Sixth 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 fifth 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. In particular, when the perforated nonwoven fabric is of the fourth aspect, the folds formed in the nonwoven fabric layer on the skin side are thin folds, and the folds formed in the nonwoven fabric layer on the opposite side are gently folded thick folds. Therefore, the contact area between the nonwoven fabric layer on the skin side and the skin is small, and the gaps between the folds are large, so that the fabric is particularly excellent in breathability. The folds on the opposite side are less likely to be deformed such as to fall down, which impairs the aesthetic appearance, and have excellent shape stability.

<Seventh 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 according to any one of the first to sixth 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 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, advantages, such as being able to ensure favorable air permeability and softness|flexibility, and forming more regular folds, are 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; (a) 6-6 cross-sectional view of FIG. 11, (b) 7-7 cross-sectional view of FIG. It is a diagram. FIG. 4 is a plan view showing an enlarged main part of the exterior body in the unfolded state; (a) 6-6 cross-sectional view of FIG. 13, (b) 7-7 cross-sectional view of FIG. and (d) a cross-sectional view of another portion in a contracted state through the first row of holes and the second row of holes. (a) Cross-sectional view in the orthogonal direction in the deployed state, (b) Cross-sectional view in the expansion and contraction direction in the deployed state, and (c) Cross-sectional view in the contracted state of the portion passing through the first hole row and the second hole row, showing the main part. is. It is an enlarged cross-sectional view of a perforated nonwoven fabric. FIG. 4 is a plan view showing an enlarged main part of the exterior body in the unfolded state; (a) Front view showing the outer surface of the exterior body in the state of natural length, (b) Front view showing the inner surface of the exterior body in the state of natural length, (c) Front view showing the outer surface of the exterior body in a state of being stretched to some extent is.

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 54, 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

As shown in FIGS. 2 to 5, the exterior bodies 12F and 12B have front and back surfaces formed by an outer nonwoven fabric layer 12S and an inner nonwoven fabric layer 12H. Needless to say, one of the outer nonwoven layer 12S and the inner nonwoven layer 12H corresponds to the first nonwoven layer of the present invention, and the other corresponds to the second nonwoven layer of the present invention. The nonwoven fabric layer 12H is formed by folding one sheet material so that the crease is located on the side of the waist opening, as shown in FIG. 5, or by bonding two sheet materials together, as shown in FIG. can also be formed. 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. It may be a structure. 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 hole shape as shown in FIG. 10(b), a perfect circular shape as shown in FIGS. Any shape such as triangles, rectangles, polygons such as rhombuses, star shapes, and cloud shapes can be used. 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 5.0 mm, particularly 0.6 to 2.0 mm. The dimension of the ED (dimension of the longest portion) 14W is preferably 0.3-3.0 mm, particularly 0.4-1.5 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 0.1 to 2.7 mm ² (especially 0.1 to 1.0 mm ² ), and the area ratio is 1.0 mm 2 . It is preferably about 0 to 15.0% (especially 5.0 to 10.0%).

The planar arrangement of the holes 14 in one perforated nonwoven fabric is not particularly limited. Thus, for example, although not shown, when both the outer nonwoven layer 12S and the inner nonwoven layer 12H are perforated nonwoven fabrics, the outer nonwoven layer 12S and the inner nonwoven layer 12H have at least one of the size, shape and arrangement of the holes 14. can be different.

On the other hand, the planar arrangement of all the holes 14 in the outer nonwoven layer 12S and the inner nonwoven layer 12H (that is, when all the holes are projected onto a plane) is a row 91 of holes 14 spaced apart in the orthogonal direction XD. 92 are arranged at intervals in the expansion/contraction direction ED, and the diameter of the holes 14 decreases from one side to the other in the thickness direction. The second row of holes 92 that become smaller toward one side from the other side can be determined as appropriate as long as they are alternately repeated at predetermined center intervals in the expansion/contraction direction ED.

For example, as shown in FIGS. 10(a), 10(c) and 10(d), the planar arrangement of all the holes 14 is such that rows of the holes 14 linearly arranged at predetermined intervals in the orthogonal direction XD are arranged in the expansion/contraction direction ED at predetermined intervals. It is preferable that they are in the form of a matrix that repeats at intervals. In this case, as shown in FIG. 10(a), the spacing 14x of the holes 14 in the expansion/contraction direction ED is shorter than the spacing 14y in the orthogonal direction XD of the holes 14, and as shown in FIG. 10(c), An arrangement in which the spacing 14x of the holes 14 in the expansion/contraction direction ED and the spacing 14y in the orthogonal direction XD of the holes 14 are substantially equal, or as shown in FIG. The array can be longer than the spacing 14y in the direction XD. Further, as shown in FIGS. 10(b) and 10(e), rows 91 and 92 of holes arranged linearly at predetermined intervals in the orthogonal direction XD are spaced apart in the expansion/contraction direction ED and positioned in the orthogonal direction XD. It can be a staggered array. The example shown in FIG. 10B is a so-called staggered (hexagonal lattice) arrangement in which the holes 14 are alternately arranged in adjacent hole rows 91 and 92 . Further, as shown in FIG. 10(f), as long as the adjacent hole rows 91 and 92 have a continuous portion in the orthogonal direction XD, the holes 14 may be arranged in a wavy line with a center line along the orthogonal direction. , a row of holes 14 spaced apart in the direction orthogonal to the expansion/contraction direction ED are included in those arranged at intervals in the expansion/contraction direction ED.

The dimensions and shape of the holes 14 in the first hole row 91 and the dimensions and shape of the holes 14 in the second hole row 92 may be the same, but it is more preferable that at least one of them is different.

Even if the orthogonal direction interval 14y between the holes 14 in the first hole row 91 and the second hole row 92 and the expansion/contraction direction interval 14x between the first hole row 91 and the second hole row 92 are constant, they may change. You may These can be determined as appropriate, but in consideration of air permeability, the orthogonal direction spacing 14y between the holes 14 is preferably within the range of 0.9 to 8.0 mm, particularly 1.0 to 3.0 mm. The interval 14x in the expansion/contraction direction between the first row of holes 91 and the second row of holes 92 is preferably in the range of 2.0 to 10 mm, particularly 3.0 to 5.0 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 periphery is formed by cut ends of fibers, there are almost no cut ends of fibers around the periphery of the hole 14, and a pin is inserted between the fibers to spread them. It may also be a non-punched type hole 14 (with high fiber density at the edges) formed in the hole.

In any case, the diameter of the hole 14 decreases from the pin insertion side toward the opposite side. This includes cases in which the diameter of the pores 14 continues to decrease throughout the thickness of the nonwoven fabric layer, as well as cases in which the diameter of the pores 14 does not substantially decrease in the middle of the thickness. As shown in FIGS. 16(a) and 16(c), such a non-punching 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. The protrusion 14e is formed on the side opposite to the pin insertion side, and the protrusion 14e is formed on the pin insertion side by extruding fibers to 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 such that the protruding height i of the hole 14 facing the longitudinal direction is higher than the protruding height j of the facing portion perpendicular 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. 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 FIG. 17, hot-melt adhesive 19H is intermittently applied to the outer peripheral surface of both ends of the elastic member 19 in the expansion/contraction direction ED by application means such as a comb gun or Surewrap nozzle. 19 can be sandwiched between outer nonwoven layer 12S and 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. 11 and 13, hot-melt adhesive is continuously applied to the outer peripheral surface of the elastic member 19 by an application means such as a comb gun or Surewrap nozzle. It can also be sandwiched between nonwoven fabric layers 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 the position where the elastic member 19 is arranged, not only at both ends in the elastic direction ED in the elastic region A2 but also in the longitudinal direction. In addition, although not shown, a hot-melt adhesive 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, and then the outer nonwoven fabric is applied. An elastic member 19 can also be sandwiched between layer 12S and inner nonwoven layer 12H. In this case, the hot-melt adhesive may be continuous in the orthogonal direction XD, or intermittently arranged in the orthogonal direction XD. Furthermore, in these cases, the continuous portion of the hot melt adhesive may extend over a plurality of elastic members.

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 sheet joints 70 where the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are joined. , and is formed in a striped pattern that is substantially continuous in the stretching direction ED. In this manner, since the sheet joints 70 are formed at intervals in the orthogonal direction XD orthogonal to the stretching direction ED, good air permeability and flexibility can be ensured. In addition, when the sheet joints are substantially continuous in the stretching direction, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are integrated at each sheet joint and can only be deformed along each other. As a result, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are shrunk in accordance with the contraction of the elastic member, including the natural length state, in the sheet joint portion 70 and its vicinity. Folds 80 are formed on both the front and back surfaces in a wavy shape. In addition, under this influence, even in the region between the adjacent sheet joints 70, the shape of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H at the sheet joint 70 is generally followed by the shape shown in FIG. 12(c). As shown, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are wavy along each other and folds 80 are formed on both front and back surfaces. In such folds 80, not only the rigidity is improved simply by the number of nonwoven fabric layers, but also the difference in the hardness of the sheet joint portion 70 and the curvature of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H causes it to bend gently (especially naturally). The difference from the conventional one is noticeable in the long state). As a result, the texture is smooth, the thickness direction is easy to crush, and the flexibility of the texture is improved. The sheet joint portion 70 may be continuous over the entire stretchable region A2 in the stretch direction ED, or may be continuous only in a partial range where the plurality of folds 80 are formed.

The arrangement of the holes 14 in the elastic structure is such that the rows 91 and 92 of the holes 14 spaced in the orthogonal direction XD are spaced in the stretch direction ED. Layer 12H tends to fold along rows 91 and 92 of holes 14 . As a result, a series of folds 80 are likely to be formed in which the holes 14 are folds. In other words, the pleats 80 are less likely to be branched or the troughs are partially widened, and as a whole, it is easier to form well-ordered pleats 80 extending along the rows of the holes 14 .

Here, if all the portions having the rows 91 and 92 of the holes 14 are simply equally prone to bending, all the rows 91 and 92 are likely to bend in the same direction. In this case, for example, when viewed from the outer surface of either the outer nonwoven layer 12S or the inner nonwoven layer 12H in the state of natural length (this is the state when the product is usually picked up), almost all the pores The 14 rows 91 and 92 may be hidden between the adjacent folds 80, making it difficult for the user to know that the perforated nonwoven fabric is used.

On the other hand, as described above, the first hole row 91 in which the decreasing direction of the diameter of the holes 14 in the thickness direction is opposite to the arrangement of all the holes 14 in the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H. and the second hole row 92 are alternately repeated at predetermined center intervals in the expansion/contraction direction ED, the first hole row 91 and the second hole row 92 are bent in opposite directions, and the first hole row 92 The rows 91 and the second hole rows 92 tend to bend in the same direction. This is because in an effective nonwoven fabric having rows of holes 14 in which the diameter of the holes 14 decreases from one side to the other in the thickness direction, valley folds occur along the rows of holes 14 and on one side in the thickness direction. Due to the fact that it is easy to break. Although the perforated 14 non-woven fabric is likely to fold along the rows of the perforations 14, the mere presence of the perforations 14 does not force the non-woven fabric to be mountain-folded or valley-folded. Therefore, if the holes 14 have different dimensions and shapes depending on the rows, the rows of the holes located in the mountain folds will have different appearances depending on the region when a plurality of elastic regions A2 are provided. There is a risk. Further, even if the product is the same, there is a possibility that the rows of the holes 14 positioned at the mountain folds are different for each product. However, in the stretchable structure of this aspect, the first hole row 91 and the second hole row 92 have opposite directions because the direction of the holes 14 is opposite in the first hole row 91 and the second hole row 92. , and the first row of holes 91 and the second row of holes 92 are likely to bend in the same direction, so that these problems are less likely to occur. Therefore, the folds 80 are more neatly arranged. Further, for example, as shown in FIG. 18A, when viewed from the outer surface of either the outer nonwoven fabric layer 12S or the inner nonwoven fabric layer 12H in the natural length state, the first hole row 91 and the second hole row 91 are arranged. One of the perforations 92 is hidden between the adjacent folds 80, that is, in the valley fold, while the other is located in the mountain fold, so that the user is informed that the perforated nonwoven fabric is used. easier. Moreover, although the holes 14 are hidden between the folds 80 in the natural length, the holes 14 are exposed as shown in FIG. 18(c) when stretched during use. This change not only improves breathability, but also has the advantage of easily appealing to users that the product has excellent breathability due to the change in appearance. Further, some of the sheet joints 70 may be arranged to pass through the holes 14 , but in that case, if the sheet joints 70 are made of the hot-melt adhesive 19H, the hot melt adhesive from the holes 14 may be removed. Melt adhesive 19H is exposed. However, locating the row of holes 14 at the bottom between the folds 80 also has the advantage that the hot-melt adhesive 19H exposed from the holes 14 is less likely to touch the skin.

It is preferable that the interval 14y in the orthogonal direction XD between the holes 14 in the first row of holes 91 and the second row of holes 92 is narrower than the interval 70y in the orthogonal direction XD between the sheet joints 70 . For example, if the interval 14y in the orthogonal direction XD between the holes 14 in the first hole row 91 and the second hole row 92 is 1/6 or more and less than 1/2 of the interval 70y in the orthogonal direction XD between the sheet joints 70 Since there are two or more holes 14 in all areas between adjacent sheet joints 70, a series of folds 80 in which the holes 14 are fold lines are more likely to be formed. Therefore, the pleats 80 are formed more easily. In the example shown in FIG. 2, in the waist portion W, the interval 14y in the orthogonal direction XD between the holes 14 in the first hole row 91 and the second hole row 92 is equal to the interval 14y in the orthogonal direction XD between the waist elastic members 19. Since it is longer, if the sheet joint portion 70 is formed of the hot-melt adhesive 19H arranged at the portion overlapping with the elastic member 19, the above condition is not satisfied, but other than the waist portion W, the above condition is satisfied. ing. Of course, it is desirable that all of the elastic areas A2 satisfy the magnitude relationship between the intervals 14y and 70y, but it is not necessary for all the elastic areas A2 to satisfy the magnitude relationship of 14y and 70y as in this example.

The sheet joints 70 are not particularly limited as long as they are formed in a striped pattern spaced apart in the orthogonal direction XD and substantially continuous in the stretch direction ED. For example, as in the examples shown in FIGS. 11 and 13, the sheet joint portion 70 may be formed only by the hot-melt adhesive 19H arranged at the portion overlapping the elastic member 19. FIG. Such a sheet joint portion 70 can be manufactured by sandwiching the elastic member 19 coated with the hot-melt adhesive 19H between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H, and is widely used in the field of disposable wearing articles. used. However, in this structure of the sheet joint portion 70, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H contract together with the elastic member 19 at the sheet joint portion 70, resulting in a dense fiber structure. Therefore, as shown in FIG. 18, in principle, the folds 80 are likely to be split at the sheet joint portion 70 . On the other hand, as described above, the interval 14y in the orthogonal direction XD between the holes 14 in at least the first hole row 91 and the second hole row 92 is narrower than the interval 70y in the orthogonal direction XD between the sheet joints 70. , the holes 14 have a dominant effect on the formation of the folds 80, so that even though the folds 80 are likely to be broken at the sheet joints 70, the pleats 80 extending along the rows of the holes 14 are formed as a whole. easier to be

Instead of (or in addition to) arranging the hot melt adhesive 19H in the region overlapping the elastic members 19, as shown in FIG. A sheet joint 70 that is substantially continuous with the ED can also be formed. In the latter case, the sheet joining portion 70 may be formed by material welding such as heat sealing or ultrasonic sealing, in addition to being formed by hot melt adhesive. In addition, it goes without saying that the hot melt adhesive 19H for fixing both ends of the elastic member 19 may join the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H.

The dimension 70L of the sheet joint portion 70 in the orthogonal direction XD can be determined as appropriate, but is preferably short, and is 0.2 to 0.6 times, particularly 0.3 times the interval 19y between adjacent elastic members 19 in the orthogonal direction XD. ~0.5 times is preferred.

As shown in FIG. 17, both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are perforated nonwoven fabrics, and one of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H is provided with a first row of holes 91, A preferred structure is one in which the second row of holes 92 is provided in the other of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H. In this way, when only one of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H is provided with the first hole row 91 and only the other is provided with the second hole row 92, the first hole row 91 and the second hole row 92 are further formed. The two hole rows 92 are bent in opposite directions, and the first hole rows 91 and the second hole rows 92 are likely to bend in the same direction.

In particular, when the inner nonwoven fabric layer 12H, which is the wearer's skin side, is a non-porous nonwoven fabric, and the outer nonwoven fabric layer 12S is a perforated nonwoven fabric, the diameters of the holes 14 of the perforated nonwoven fabric are opposite to those on the opposing nonwoven fabric layer side. 12(c) and 18(b), the creases 80 formed in the inner nonwoven fabric layer 12H become thin creases and the outer nonwoven fabric layer becomes smaller as it goes from the side toward the opposing nonwoven fabric layer side. The folds 80 formed in 12S are thick folds that are gently bent. Therefore, the contact area between the inner nonwoven fabric layer 12H and the skin is small, and the gaps between the folds are large, resulting in particularly excellent breathability. The folds 80 of the outer nonwoven fabric layer 12S are less likely to be deformed such as to fall down, which impairs the aesthetic appearance, and have excellent shape stability.

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 0.4 to 1.5 mm)
Dimension 14L in orthogonal direction XD of hole 14: 0.3 to 5.0 mm (especially 0.6 to 2.0 mm)
Interval 14y in the orthogonal direction XD between the holes 14 in the first hole row 91 and the second hole row 92: 1.0 to 5.0 mm (especially 1.0 to 3.0 mm)
Spacing 14x in expansion/contraction direction ED between first row of holes 91 and second row of holes 92: 2.5 to 10.0 mm (especially 3.0 to 6.0 mm)
Distance between sheet joints 70 in orthogonal direction XD: 5 to 10 mm (especially 5 to 7 mm)
Dimension 70L of sheet joint 70 in orthogonal direction XD: 0.5 to 5.0 mm (especially 1 to 3 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.

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

・"Front and back direction" means the direction (longitudinal direction) indicated by symbol LD in the figure, and "width direction" means the direction (left and right direction) indicated by WD in the figure, and the front and back direction and the width direction are different. They 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" for 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 19H Hot melt adhesive 20 Cover nonwoven fabric 200 Inner body 201 Inner/outer joint 30 Top sheet 40 Intermediate sheet 50 Absorption Elements 56... Absorbent body 58... Packaging sheet 60... Rising gather 62... Gathered non-woven fabric A1... Non-stretchable area A2... Stretchable area C... Buttocks cover part L... Intermediate area LD... Back and forth direction LO ... Leg opening T... Waist region U... Lower waist part W... Waist part WD... Width direction WO... Waist opening 70... Sheet joint part XD... Orthogonal direction ED... Elastic direction 80... Folds , 91, 92 ... rows, 91 ... first row of holes, 92 ... second row of holes.

Claims (7)

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 where the first nonwoven fabric layer and the second nonwoven fabric layer are joined,
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 sheet joints are formed in a striped pattern spaced apart in the orthogonal direction and substantially continuous in the stretching direction,
The arrangement of the holes in the stretchable structure is such that the rows of holes spaced apart in the orthogonal direction are spaced in the stretchable direction, and the diameter of the holes extends from one thickness direction to the other. A first row of holes that gradually decreases in diameter and a second row of holes in which the diameter of the holes decreases from the other to the other in the thickness direction, and are alternately repeated at predetermined center intervals in the direction of expansion and contraction. is
An elastic structure for a disposable wearing article characterized by: The first row of holes and the second row of holes each have holes of the same size and shape that are linearly arranged in the orthogonal direction at predetermined center intervals.
The elastic structure of the disposable wearing article according to claim 1. The sheet joint portion is formed of a hot-melt adhesive disposed at a portion overlapping with the elastic member,
the spacing in the orthogonal direction between the holes in the first row of holes and the second row of holes is narrower than the spacing in the orthogonal direction between the sheet joints;
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 interval in the orthogonal direction between the holes in the first row of holes and the second row of holes is 1.0 to 5.0 mm;
The distance between the first row of holes and the second row of holes in the expansion and contraction direction is 2.5 to 10.0 mm,
The interval between the sheet joints in the orthogonal direction is 5 to 10 mm,
The elastic structure of the disposable wearing article according to any one of Claims 1 to 3, wherein the dimension of the sheet joint portion in the orthogonal direction is 0.5 to 5.0 mm. Both the first nonwoven fabric layer and the second nonwoven fabric layer are perforated nonwoven fabrics, and the first row of holes is provided in one of the first nonwoven fabric layer and the second nonwoven fabric layer, and the first nonwoven fabric layer and the other of the second nonwoven fabric layer is provided with the second row of holes,
The elastic structure of the disposable wearing article according to any one of claims 1 to 4. 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 claims 1 to 4 . 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 outer body of at least one of the front body and the back body is according to any one of claims 1 to 6, covering a width direction range corresponding to between the side seal portions in at least a partial 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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