JP2020018389A - Expansion structure of disposable wearing article and pants type disposable wearing article having the expansion structure - Google Patents

Abstract

To prevent deterioration of a pleats' appearance in an expansion direction using porous non-woven fabric.SOLUTION: An expansion structure of a disposable wearing article has many thin and long elastic members 19 which are arranged between outside non-woven fabric layer 12S and inside non-woven fabric layer 12H at intervals in the direction orthogonal to an expansion direction ED that expand along the expansion direction ED. The outside non-woven fabric layer 12S is porous non-woven fabric where holes 14 penetrating in the thickness direction are arranged. A sheet joint part joining the outside non-woven fabric layer 12S and the inside non-woven fabric layer 12H is formed by hot-melt adhesives 14H applied in a stripe pattern at intervals in the expansion direction ED and continuing in the orthogonal direction XD. Adjacent sheet joint parts 70 are non-joint parts 71; difference in gap between columns 91, 92 of holes positioned nearest the sheet joint parts 70 and gaps 91d, 92d from the sheet joint parts 70 adjacent to the same on both sides in the expansion direction ED of the respective non-joint parts 71 is equal to or smaller than 14w dimension in the expansion direction of the holes 14.SELECTED DRAWING: Figure 17

Description

  The present invention relates to an elastic structure of a disposable wearing article and a pants-type disposable wearing article having the elastic structure.

  In disposable wearing articles, it is common to provide a stretchable 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 an elastic structure in the waist direction in the waist portion or to provide an elastic structure in the leg surrounding portion in the direction around the leg. . Further, it is widely practiced to provide a front-back elastic structure called a three-dimensional gather or a flat gather throughout not only disposable diapers of a pants type or a tape type but also disposable wearing articles including a sanitary napkin. References 1 to 3).

  A typical example of such a stretchable structure of a disposable wearing article is an elongated elastic member provided between the overlapping first nonwoven fabric layer and second nonwoven fabric layer along the stretching direction and spaced apart from each other. It is provided. The first nonwoven fabric layer and the second nonwoven fabric layer form a planar stretchable region, and also have a role of covering and hiding the elastic member. The elastic member built in between the first nonwoven fabric layer and the second nonwoven fabric layer has an elasticity. It plays a role in creating power for the work. In a state where the elastic member is extended in the expansion and contraction direction, at least portions located at both ends of the expansion and contraction region are fixed to the first nonwoven layer and the second nonwoven layer. By this fixation, the elastic member is integrated with the first nonwoven fabric layer and the second nonwoven fabric layer, and the first nonwoven fabric layer and the second nonwoven fabric layer are contracted by the contraction force of the elastic member and include folds (wrinkled ones). The elastic member is formed not only in its natural length state, but also in an extended state of the elastic member (hereinafter, also simply referred to as a fold). Is expanded. Usually, the first nonwoven fabric layer and the second nonwoven fabric layer are in a developed state without folds at the elastic extension limit, and the folds are closer together with the contraction of the elastic member, and are closest in the natural length state.

  In such a stretchable structure, when the first nonwoven fabric layer and the second nonwoven fabric layer are free from each other, one nonwoven fabric layer partially or entirely floats on the other nonwoven fabric layer, causing unnecessary folds and bulges. The first nonwoven fabric layer and the second nonwoven fabric layer need to be joined directly or indirectly over substantially the entirety of the first nonwoven fabric layer because the first nonwoven fabric layer and the second nonwoven fabric layer may be deteriorated or cause a shift in fitting during mounting. Further, in order to create elasticity by the elastic member, the elastic member extends over the entire elastic direction of the elastic region, and at least portions located at both ends of the elastic region in the elastic direction are the first nonwoven layer and the second nonwoven layer. In the natural length state, the first nonwoven fabric layer and the second nonwoven fabric layer must also be contracted with the contraction of the elastic member. 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.

  At present, as a means for fixing the elastic member to the first nonwoven fabric layer and the second nonwoven fabric layer, in most cases, a hot melt adhesive is selected. 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. Is also used persistently. For example, by joining the first nonwoven fabric layer and the second nonwoven fabric layer via a hot melt adhesive at the position where the elastic member passes, 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 are performed. The first nonwoven fabric layer and the second nonwoven fabric layer via a hot melt adhesive intermittently arranged in the expansion and contraction direction and continuous in the direction perpendicular to the expansion and contraction direction, in addition to the dual-purpose form also serving to fix the elastic member to the nonwoven fabric layer. And a mode in which the first nonwoven fabric layer and the second nonwoven fabric layer are joined via a hot-melt adhesive intermittently arranged in a direction perpendicular to the stretching direction and substantially continuous in the stretching direction. Have been. (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 the air permeability (for example, see Patent Documents 7 to 9).

  Of these, those described in Patent Documents 7 and 8 are a method of joining the first nonwoven fabric layer and the second nonwoven fabric layer with an adhesive applied in a spiral or stripe shape over the entire surface of one nonwoven fabric layer, and forming the first nonwoven fabric layer. And the elastic member is fixed to the second nonwoven fabric layer. The formation of the holes in the first nonwoven fabric layer and the second nonwoven fabric layer is performed by melting, cutting out, or punching before or after joining the first nonwoven fabric layer and the second nonwoven fabric layer.

  In Patent Documents 7 and 8, when the adhesive pattern is spiral, the bonding of the first nonwoven fabric layer and the second nonwoven fabric layer becomes the whole surface, so that air permeability in portions other than the holes is reduced and flexibility is increased. May also be reduced (stiffness is increased). Therefore, from the viewpoint of air permeability and flexibility, the adhesive pattern is preferably a stripe shape in which application lines extending in a direction perpendicular to the direction of expansion and contraction are repeatedly provided at intervals in the direction of expansion and contraction. It is desirable that the width of the coating line is as narrow as possible. Furthermore, if the adhesive pattern is striped, the sheet bonding portion where the first nonwoven fabric layer and the second nonwoven fabric layer are bonded becomes a continuous groove in a direction orthogonal to the direction of expansion and contraction, and the non-bonded portion between the grooves is the same. The first non-woven fabric layer and the second non-woven fabric layer bulge in opposite directions (on both sides) to the same extent to form a fold. The same applies when the bonding pattern is staggered. In this case, since the portions between the folds and the inner space of the folds are continuous in the direction orthogonal to the expansion and contraction direction, not only is the air permeability excellent in the direction orthogonal to the expansion and contraction direction, but also the appearance is preferable due to the formation of the aligned folds. It will be.

  However, in the perforated nonwoven fabric in which holes penetrating in the thickness direction are arranged, since the portion having the holes is weak and easily bent, the shape of the fold changes depending on the arrangement of the holes between the adjacent sheet joints, and the beauty of the folds is improved. There is a risk of damage.

  For example, when a hole is provided only in the center in the expansion and contraction direction between adjacent sheet joints, the fold formed in a contracted state such as a natural length state tends to be an inverted V-shape sharply bent in the center in the expansion and contraction direction. . However, in the case of using a nonwoven fabric in which a hole penetrating in the thickness direction is formed in advance, it is difficult to accurately match the position of the sheet joint with the position of the hole, so that the folding position of the fold is adjacent to the sheet joint. The fold may be deviated from the center between them, and the fold may be inclined to one side, which may impair the aesthetic appearance. Another problem is that the V-shaped fold has a sharp tip, so that it feels soft to the touch.

  Furthermore, if there is a staggered hole between adjacent sheet joints, the folds formed in a contracted state, such as a natural length state, will have a wavy shape because the easily breakable portion changes in the perpendicular direction. And the appearance may be impaired.

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

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

The elastic structure and the like of the disposable wearing article which solved the above-mentioned problems are as follows.
<First aspect>
A first nonwoven fabric layer and a second nonwoven fabric layer that partially or entirely overlap with each other, and are arranged between the first nonwoven fabric layer and the second nonwoven fabric layer at intervals in a direction perpendicular to the direction of expansion and contraction, along the direction of expansion and contraction; Having a plurality of elongated elastic members extending,
The elastic member has at least both ends in the stretching direction in the stretching region fixed to the first nonwoven fabric layer and the second nonwoven fabric layer,
The stretchable region has a sheet joining portion in which the first nonwoven fabric layer and the second nonwoven fabric layer are joined by adhesion or welding,
At least one of the first nonwoven fabric layer and the second nonwoven fabric layer is a perforated nonwoven fabric in which holes penetrating in a thickness direction are arranged.
In the elastic structure of disposable wearing articles,
The array of holes, the row of holes arranged linearly at intervals in the orthogonal direction, are arranged at intervals in the expansion and contraction direction,
The bonding or welding is intermittent in the expansion and contraction direction, and is made in a continuous or intermittent pattern in the orthogonal direction,
Between the sheet bonding portion in the expansion and contraction direction, the first nonwoven fabric layer and the second nonwoven fabric layer are non-bonded portions that are not bonded,
The perforated nonwoven fabric includes, for each of the non-joined portions, a row of first holes near the sheet joining portion on one side, a row of second holes near the sheet joining portion on the other side, One or more rows of third holes located therebetween; and
The distance between the first row of holes and the sheet joint adjacent thereto in the expansion and contraction direction is a first distance, and the expansion and contraction of the second row of holes and the adjacent sheet joint is adjacent to each other. When the interval in the direction is the second interval, the difference between the first interval and the second interval is equal to or less than the dimension of the hole in the expansion and contraction direction.
An elastic structure of a disposable wearing article characterized by the following.

(Effects)
In this stretchable structure, the bonding or welding process is performed intermittently in the direction of expansion and contraction and in a continuous or intermittent pattern in the direction orthogonal to the sheet, thereby forming a sheet joint. Therefore, in the present stretchable structure, in a contracted state to some extent including the natural length state, the sheet joining portion becomes a groove continuous in a direction orthogonal to the stretching direction, and the first nonwoven fabric layer and the second nonwoven fabric in the non-joining portion between the grooves. The nonwoven layers bulge to the same extent in opposite directions (on both sides) to form folds.

  The perforated nonwoven fabric is easily bent at a portion having holes. Therefore, when the arrangement of holes is basically a row of holes as in the present elastic structure, and there are three or more rows of holes in each fold, the shape of the folds is as in the case of one row of holes. Does not have a sharp inverted V-shape, but has a gently bent shape. In addition, the perforated nonwoven fabric of the present stretchable structure has a row of holes located closest to the sheet joint (thus excluding a portion that is in contact with or overlapping with the sheet joint) in each non-joined part and a sheet joint adjacent thereto. (The first interval and the second interval) is small, and is equal to or smaller than the dimension of the hole in the direction of expansion and contraction. Therefore, the base supporting the folds (portions corresponding to the first interval and the second interval) is substantially symmetrical with respect to the center in the direction of expansion and contraction, and folds having a uniform appearance are formed.

  Further, in the present stretchable structure, since there are three or more rows of holes in each fold, the air permeability between the space between the first nonwoven fabric layer and the second nonwoven fabric layer in each fold and the outside is also improved.

  In addition, in order that welding is performed continuously in a direction orthogonal to the direction of expansion and contraction, as long as at least one of the first nonwoven fabric layer and the second nonwoven fabric layer has a continuous trace of welding, the intersecting position between the welding process and the elastic member is considered. The first nonwoven fabric layer and the second nonwoven fabric layer are welded to the elastic member, and the first nonwoven fabric layer and the second nonwoven fabric layer are indirectly welded to each other. Also, a mode in which the welding between the first nonwoven fabric layer and the second nonwoven fabric layer is not continuous due to the interposition of the elastic member at the intersection position between the first nonwoven fabric layer and the second nonwoven fabric layer is included.

<Second aspect>
The row of the third holes includes a row located at the center of the non-joined portion in the expansion and contraction direction,
The arrangement of the holes in each non-joined portion is line-symmetric with respect to the center in the stretching direction at each non-joined portion,
An elastic structure of the disposable wearing article according to the first aspect.

(Effects)
Adopting the hole arrangement of the present elastic structure is preferable because the center of the fold hardly shifts, and the fold linearly extends in the orthogonal direction and is easily neatly arranged.

<Third aspect>
The diameter of each hole in the perforated nonwoven fabric is smaller as it goes from the opposite nonwoven fabric layer side to the opposite nonwoven fabric layer side,
An elastic structure of the disposable wearing article according to the first or second aspect.

(Effects)
As in the present elastic structure, when the diameter of the hole is reduced from the opposite side of the nonwoven fabric layer to the side of the nonwoven fabric layer facing the nonwoven fabric layer, the surface of the hole and the vicinity thereof is opposite to the nonwoven fabric layer facing the nonwoven fabric layer. It is easy to break like a valley fold. This pliability is opposite to the direction in which the perforated nonwoven fabric bends during the formation of the fold. Therefore, the perforated nonwoven fabric is easy to bend at a portion having a hole, but the tendency is weakened, so that the influence of the arrangement of the holes on the shape of the fold is reduced, and the fold having a large number of holes has a more organized appearance. Becomes

  The diameter of the hole means a dimension in a direction passing through the center of gravity of the hole and orthogonal to the direction of expansion and contraction (therefore, a circle has a diameter, and an ellipse has a long diameter).

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

(Effects)
When the present stretchable structure is manufactured by using a pre-formed perforated nonwoven fabric, the linear portion partially subjected to the bonding or welding process and the row of holes overlap each other, so that the first portion to be the sheet joint portion is formed. There is a possibility that a number of missing portions where the nonwoven fabric layer and the second nonwoven fabric layer are not joined are formed. The same applies to the case where the center distance in the expansion / contraction direction of the sheet joining portion is different from the center distance in the expansion / contraction direction of the row of holes. Here, when the interval in the orthogonal direction of the holes in the row of holes is smaller than the dimension in the orthogonal direction of the holes, the sheet joining portion becomes a dotted line intermittent through a long notch or a long concave portion at the edge of the sheet joining portion. May be formed in large numbers. As described above, when the gap between the sheet joints is large, large irregularities are formed on the side edges of the folds, and the folds are easily merged with the adjacent folds. Further, when the sheet joining portion has a missing portion, the sheet joining portion is more easily peeled than the area of the sheet joining portion is simply reduced because stress is easily concentrated.

  On the other hand, if the interval in the orthogonal direction of the holes in the row of holes is sufficiently larger than the dimension in the orthogonal direction of the holes, even if a cutout portion is formed in some of the sheet joints, the orthogonality of the sheet joints is reduced. Since the ratio of the missing portion in the direction is less than half, the adverse effect of the missing portion on the shape of the fold and the adverse effect on the strength of the sheet joint portion can be smaller.

<Fifth aspect>
Does not have a hole that overlaps the part where the bonding or welding process was performed,
The elastic structure of the disposable wearing article according to any one of the first to fourth aspects.

(Effects)
In this stretchable structure, a hole that overlaps with a portion that has been bonded or welded to form a sheet joint (in the case of an adhesive, a portion to which the adhesive is applied, and in the case of welding, a fused portion of the material to be welded) Does not have. As a result, as described above, since the sheet joining portion does not have a missing portion, there is substantially no adverse effect on the shape of the fold due to the missing portion and no adverse effect on the strength of the sheet joining portion.

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

(Effects)
The arrangement of the holes and the sheet joining portion can be determined as appropriate, but is preferably within the range of this embodiment.

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

(Effects)
By making the nonwoven fabric layer on the skin side a nonporous nonwoven fabric, it is possible to eliminate the effect of pores on the touch. Further, since only one of the first nonwoven fabric layer and the second nonwoven fabric layer has a hole, the skin is not exposed at the time of wearing, and leakage through the hole can be prevented.

<Eighth aspect>
An integrated exterior body that extends from the front to the rear, or an exterior body that is separately provided on the front and the rear, and an interior body that is attached to the widthwise middle part of this exterior body and extends over the front and rear sides of the crotch A side seal portion in which both sides of the exterior body in the front body and both sides of the exterior body in the back body are joined, a waist opening and a pair of left and right leg openings,
The stretchable structure according to any one of the first to seventh aspects, wherein the outer body in at least one of the front body and the back body extends over a width direction range corresponding to the side seal portion in at least a part of a range in the front-rear direction. Is provided so that the stretching direction of the stretching region is the width direction.
Pants-type disposable wearing article characterized by the above-mentioned.

(Effects)
The above-described stretchable structure is suitable for an outer package of a pants-type disposable wearing article.

  ADVANTAGE OF THE INVENTION According to this invention, in the expansion-contraction structure of an absorbent article using a perforated nonwoven fabric, the advantage that the deterioration of the appearance of a fold can be prevented is provided.

It is a top view which shows the inner surface of the pants | underpants type disposable diaper of a deployment state. It is a top view which shows the outer surface of the pants | underpants type disposable diaper of a deployment state. It is 2-2 sectional drawing of FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 1. FIG. 4A is a sectional view taken along line 4-4 of FIG. 1 and FIG. 4B is a sectional view taken along line 5-5 of FIG. It is a perspective view (a hole is omitted) of a pants type disposable diaper. It is a top view which shows the outer surface of the interior body of an expansion state with the outline of an exterior body. It is a top view which shows the outer surface of the pants | underpants type disposable diaper of a deployment state. (A) is a sectional view taken along line 4-4 in FIG. 8, and (b) is a sectional view taken along line 5-5 in FIG. It is a top view which shows the example of arrangement | positioning of a hole. It is a top view which expands and shows the principal part of the exterior body of a deployment state. FIG. 12A is a cross-sectional view of the main part, taken along line 6-6 in FIG. 11, FIG. 11B is a cross-sectional view taken along line 7-7 in FIG. 11, and FIG. It is a top view which expands and shows the principal part of the exterior body of a deployment state. 13 (a) is a sectional view taken along line 6-7 in FIG. 13, FIG. 13 (b) is a sectional view in a contracted state, and FIG. FIG. 2A is a cross-sectional view in an orthogonal direction in an expanded state, FIG. 2B is a cross-sectional view in an expansion and contraction state in an expanded state, and FIG. It is a top view which expands and shows the principal part of the exterior body of a deployment state. It is a top view which expands and shows the principal part of the exterior body of a deployment state. It is an expanded sectional view of a perforated nonwoven fabric. (A) is a front view showing the main part outer surface of the exterior body in a natural length state, and (b) is a front view showing the main part outer surface of the exterior body in a state of being extended to some extent.

  Hereinafter, examples of the pants-type disposable diaper will be described in detail with reference to the accompanying drawings. The dot pattern in the cross-sectional view indicates an adhesive as a joining means for joining the constituent members located on the front side and the back side. The hot melt adhesive is formed by a known method such as slot coating, continuous linear 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 together with this, at the fixing portion of the elastic member, a hot melt adhesive can be applied to the outer peripheral surface of the elastic member, and the elastic member can be fixed to the adjacent member. Examples of the hot-melt adhesive include EVA-based, adhesive rubber-based (elastomer-based), olefin-based, and polyester / polyamide-based adhesives, but can be used without any particular limitation. As a joining means for joining the constituent members, 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 rear body B, and a rear outer body via the crotch portion from the front outer body 12F. And an inner body 200 provided inside the outer 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 a side seal portion 12A. As a result, the opening formed by the front and rear ends of the exterior bodies 12F and 12B becomes the waist opening WO through which the wearer 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 respectively surrounded by the side edges become the leg openings LO through which the legs pass. The inner body 200 is a part that absorbs and retains excretions such as urine, and the outer bodies 12F and 12B are parts that support the inner body 200 with respect to the wearer's body. The symbol Y in the figure indicates the entire length of the diaper in the deployed 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 is in the deployed state. Shows the full width of the diaper.

  Further, the pants-type disposable diaper has a waist circumference region T defined as a front-rear range (a front-rear range from the waist opening WO to the upper end of the leg opening LO) having the side seal portion 12A, and a portion forming the leg opening LO. An intermediate region L defined as a front-rear direction range (between a front-rear region having the side seal portion 12A of the front body F and a front-rear region having the side seal portion 12A of the rear body B). The waist area T can be conceptually divided into a “waist portion” W, which conceptually forms the edge of the waist opening, and a “waist lower portion” U, which is a lower portion. Normally, when there is a boundary in the waist circumference region T where the stretching stress in the width direction WD changes (for example, the thickness or elongation rate of the elastic member changes), the waist opening WO side is more waist than the boundary closest to the waist opening WO side. When there is no such a boundary, the waist opening W side is closer to the waist opening WO than the absorber 56 or the interior 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 waist lower 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 a curved shape along the circumference of the leg of the wearer, and this is a portion where the leg of the wearer is put. As a result, the unfolded pants-type disposable diaper has a substantially hourglass shape as a whole.

(Inner and outer joints)
The fixing of the inner body 200 to the outer bodies 12F and 12B is not particularly limited, and can be performed by, for example, a hot melt adhesive. In the illustrated example, the inner surface of the exterior bodies 12F and 12B is applied to the back surface of the interior body 200, that is, the hot melt adhesive applied to the back surface of the liquid-impermeable sheet 11 and the base portion 65 of the rising gather 60 in this case. Is fixed. The inner / outer joint portion 201 for fixing the inner body 200 and the outer bodies 12F and 12B can be provided in almost the entire region where the inner and outer bodies 12F and 12B overlap with each other. it can.

(Interior body)
The interior body 200 can take any shape, but is rectangular in the illustrated form. As shown in FIGS. 3 to 5, the inner body 200 includes a top sheet 30 on the body side, a liquid impermeable sheet 11, and an absorbing element 50 interposed therebetween. Yes, it is the main body that performs the absorption function. Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbing element 50 in order to promptly transfer the liquid that has passed through the top sheet 30 to the absorbing element 50, and reference numeral 60 denotes the intermediate sheet. Shows rising gathers 60 extending from both sides of the inner body 200 so as to contact around the leg of the wearer in order to prevent excrement from leaking to both sides of the inner body 200.

(Top sheet)
The top sheet 30 has a property of permeating a liquid, and examples thereof include a perforated or non-porous nonwoven fabric and a porous plastic sheet. In addition, the non-woven fabric is not particularly limited in its raw material fiber. 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. And the like. Further, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods, for example, a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, a point bond method, and the like. For example, if flexibility and drapability are required, the spun bond method and the spun lace method are bulky and if the softness is required, the air through method, the point bond method, and the thermal bond method are preferred processing methods. .

  Further, the top sheet 30 may be composed of one sheet or a laminated sheet obtained by laminating two or more sheets. Similarly, the top sheet 30 may be composed 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 absorbing element 50, or may protrude laterally from the side edges of the absorbing element 50 without being folded.

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

(Intermediate sheet)
In order to quickly transfer the liquid that has passed through the top sheet 30 to the absorber, an intermediate sheet (also called a “second sheet”) 40 having a higher liquid permeation speed than the top sheet 30 can be provided. This intermediate sheet 40 not only enhances the absorption performance of the absorber by promptly transferring the liquid to the absorber, but also prevents the "return" phenomenon of the absorbed liquid from the absorber, so that the top sheet 30 is always dried. It can be in the state of having done. The intermediate sheet 40 can be omitted.

Examples of the intermediate sheet 40 include the same material as the top sheet 30, spunlace nonwoven fabric, spunbonded nonwoven fabric, SMS nonwoven fabric, pulp nonwoven fabric, a mixed sheet of pulp and rayon, point-bonded nonwoven fabric, and crepe paper. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a conjugate fiber having a core-sheath structure for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. Basis weight is preferably ^{20~80g / m 2, 25~60g / m} 2 is more preferable. The thickness of the raw material fibers of the nonwoven fabric is preferably 2.0 to 10 dtex. In order to increase the bulk of the nonwoven fabric, it is also preferable to use eccentric fibers, hollow fibers, or eccentric and hollow fibers whose center is not at the center, as all or part of the mixed fibers of the raw fibers.

  The illustrated intermediate sheet 40 is disposed at the center shorter than the width of the absorber 56, but may be provided over the entire width. The length of the intermediate sheet 40 in the longitudinal direction may be the same as the entire length of the diaper, may be the same as the length of the absorbing element 50, or may be within a short range centered on the liquid receiving area.

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

(Liquid impermeable sheet)
Although the material of the liquid impermeable sheet 11 is not particularly limited, for example, a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric having a plastic film on the surface of a nonwoven fabric, a plastic film And a laminated sheet in which a non-woven fabric or the like is overlapped and joined. For the liquid impermeable sheet 11, it is preferable to use a liquid impermeable and moisture permeable material which is preferably used from the viewpoint of preventing stuffiness. As a plastic film having moisture permeability, a microporous plastic film obtained by kneading an inorganic filler in an olefin-based resin such as polyethylene or polypropylene, forming a sheet, and then stretching in a uniaxial or biaxial direction. Is widely used. In addition, non-woven fabrics using micro denier fibers, methods such as strengthening leakage prevention by reducing the voids of the fibers by applying heat or pressure, and applying a highly water-absorbent resin or a hydrophobic resin or a water-repellent agent Thus, 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 fits on the back side of the absorbing element 50 as shown in the figure, and in order to enhance leakage prevention, the liquid impervious sheet 11 is wrapped around both sides of the absorbing element 50 so as to cover the side of the top sheet 30 of the absorbing element 50. It can also extend to both sides. It is appropriate that the width of the extending portion is about 5 to 20 mm on each of the left and right sides.

(Get up gather)
The rising gathers 60 are for preventing lateral leakage, extend along both sides of the interior 200 in the front-rear direction LD, and stand up from the side of the interior 200 to the front side. The rising gather 60 in the illustrated example is one in which the base side portion stands diagonally toward the center in the width direction and the tip side portion rises diagonally toward the outside in the width direction from the middle portion, but is not limited thereto. However, the present invention can be appropriately changed, for example, in such a manner as to stand on the center in the width direction as a whole.

  More specifically, the rising gather 60 of the illustrated example is configured to fold a band-shaped gathered nonwoven fabric 62 having a length equal to the length in the front-rear direction of the inner body 200 in the width direction WD at a leading end portion and fold it into two. A plurality of elongated gather elastic members 63 are fixed at intervals in the width direction WD between the folded portion and the sheet in the vicinity thereof while being extended along the longitudinal direction. A proximal end (an end opposite to the sheet folded portion in the width direction WD) of the rising gather 60 opposite to the distal end is fixed to a side of the inner body 200 on the back side of the liquid impermeable sheet 11. A portion other than the root portion 65 is a main body portion 66 (a portion on the folded portion side) extending from the root portion 65. In addition, the main body portion 66 has a root portion extending toward the center in the width direction, and a distal portion that is folded back at the tip of the root portion and extends outward in the width direction. This form is a rising gather 60 of a surface contact type, but a rising gather 60 of a line contact type that is not folded outward in the width direction can also be employed. The front and rear ends of the main body portion 66 are in a laid state, and are formed as the laid down portions 67 fixed to the side surface of the top sheet 30, while the middle portion in the front and rear direction located therebetween is not fixed. A gather elastic member 63 along the front-back direction LD is fixed to at least the distal end of the free portion 68 in an extended state.

  In the rising gather 60 configured as described above, the contraction force of the gather elastic member 63 acts so as to approach both ends in the front-rear direction, but is fixed so that both ends in the front-rear direction of the main body 66 do not stand. On the other hand, a non-fixed free portion 68 is provided between them, so that only the free portion 68 stands up so as to abut on the body side as shown by an 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 stands up so as to open outward in the width direction in the crotch portion and the vicinity thereof, so that the rising gather 60 abuts around the leg around the leg. And the fit is improved.

(Absorption element)
Although the absorbing element 50 is not particularly limited, in this example, the absorbing element 50 includes an absorbing body 56 and a packaging sheet 58 that wraps the entirety of the absorbing body 56. The packaging sheet 58 can be omitted.

(Absorber)
The absorber 56 can be formed by an aggregate of fibers. Examples of the fiber aggregate include a filament aggregate obtained by spreading a tow (fiber bundle) of synthetic fibers such as cellulose acetate, as necessary, in addition to fibers obtained by stacking short fibers such as cotton-like pulp and synthetic fibers. Can also be used. It is preferable that superabsorbent polymer particles are dispersed and held in the absorber 56.

  The absorber 56 may have a rectangular shape, but as shown in FIG. 7, has a front end, a rear end, and a constricted portion 56 </ b> N narrower than the front end and the rear end located between the front end and the rear end. An hourglass shape is preferable because the fitting of the absorber 56 itself and the rising gathers 60 around the legs is improved.

  The size of the absorber 56 can be appropriately determined as long as it extends in the front-rear and left-right directions of the urination port position. However, it is preferable that the absorber 56 extend in the front-rear direction LD and the width direction WD to the periphery of the inner body 200 or its vicinity. . Reference numeral 56X indicates the width of the absorber 56.

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or the whole thereof. The superabsorbent polymer particles include “powder” in addition to “particles”. As the superabsorbent polymer particles 54, those used in this type of disposable diaper can be used as they are.

  The material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are preferred. Examples of the superabsorbent polymer particles include starch-based, cellulose-based and synthetic polymer-based particles, such as starch-acrylic acid (salt) graft copolymer, starch-acrylonitrile copolymer saponified product, and sodium carboxymethylcellulose crosslinking. Or an acrylic acid (salt) polymer can be used. The shape of the superabsorbent polymer particles is preferably in the form of a commonly used powder, 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 suitably used. If the water absorption speed is too slow, the so-called reversion in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 easily occurs.

  As the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. Thereby, even when the bulky absorber 56 is used, the sticky feeling after absorbing the liquid can be effectively suppressed.

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

(Packaging sheet)
When the packaging sheet 58 is used, as the material thereof, tissue paper, in particular, crepe paper, nonwoven fabric, polylaminated nonwoven fabric, a sheet having small holes, or the like can be used. However, a sheet from which the superabsorbent polymer particles do not escape is desirable. When a nonwoven fabric is used instead of crepe paper, hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material thereof can be polypropylene, polyethylene / polypropylene composite material, or the like. The basis weight is preferably 5 to 40 g / m ² , particularly preferably 10 to 30 g / m ² .

  The packaging form of the packaging sheet 58 can be determined as appropriate. However, from the viewpoint of ease of manufacture and prevention of leakage of the highly absorbent polymer particles from the front and rear edges, a tube is formed so as to surround the front and back surfaces and both side surfaces of the absorber 56. It is preferable that the front and rear edges protrude from the front and rear of the absorber 56, and the overlapping portion and the overlapping portion of the front and rear protruding portions are joined by joining means such as hot melt adhesive or material welding.

(Exterior)
The exterior bodies 12F and 12B include a front exterior body 12F that is a part of the front body F and a rear exterior body 12B that is a part of the back body B, and the front exterior body 12F and the rear exterior body 12B. Are not continuous on the crotch side and are separated in the front-back direction LD (exterior two-piece type). The separation distance 12d can be, for example, about 40 to 60% of the total length Y. As shown in FIGS. 8 and 9, the exterior body 12 may be an integral body that passes through the crotch from the front body F to the back body B (integrated exterior type).

  In the pants-type disposable diaper of the outer split type, since the inner body 200 is exposed between the front outer body 12F and the rear outer body 12B, the liquid impermeable sheet 11 is not exposed on the back surface of the inner body 200. Preferably, a cover nonwoven fabric 20 covering the back surface of the inner body 200 is provided between the front outer body 12F and the inner body 200 and between the rear outer body 12B and the inner body 200. The material of the cover nonwoven fabric 20 is not particularly limited, and may 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 (either a perforated nonwoven fabric layer or a nonporous nonwoven fabric layer 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 over the entire front end to the rear end of the interior body 200. As shown in FIG. 7, the front exterior body 12 </ b> F and the interior body 200 may overlap each other, and the front exterior body 12 </ b> F and the interior body 200 may overlap each other. May extend in the front-back direction LD.

  The exterior bodies 12F and 12B have a waist portion which is a front-back direction range corresponding to the waist region T. In the present embodiment, the front exterior body 12F does not have a portion corresponding to the middle area L, but the rear exterior body 12B has a buttocks cover part C extending from the waist circumference area T to the middle area L side. are doing. Although not shown, the front exterior body 12F is also provided with a groin cover portion extending from the waistline region T to the intermediate region L side, or a configuration in which a groin cover portion is provided but a buttock cover portion is not provided, or the front exterior body 12F and It is not necessary to provide a portion corresponding to the intermediate region L on both of the rear exterior body 12B. Further, in the illustrated example, the lower edge of the buttocks cover portion C is formed in a straight line along the width direction WD similarly to the lower edge of the front side exterior body 12F, but is positioned closer to the waist opening toward the outer side in the width direction. It can also be a curve that makes it appear.

  The exterior bodies 12F and 12B have an outer nonwoven fabric layer 12S and an inner nonwoven fabric layer 12H, as shown in FIGS. Needless to say, one of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H corresponds to the first nonwoven fabric layer of the present invention, and the other corresponds to the second nonwoven fabric layer of the present invention. The outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are formed by folding one sheet material so that a fold is located on the waist opening side as shown in FIG. 5, and two sheets as shown in FIG. Can be formed by laminating the above sheet materials. Further, the innermost portion 12r of these sheet materials may be extended to the end on the waist opening WO side of the interior body 200 (see the example in FIG. 9). Further, at least one of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H may be partially formed of a sheet material different from other portions.

  Examples of the constituent fibers of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H include synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides (including composite fibers such as core and sheath in addition to single component fibers). In addition, recycled fibers such as rayon and cupra, natural fibers such as cotton, and the like can be selected without particular limitation, and these can be used in combination. In order to increase the flexibility of the nonwoven fabric layers 12S and 12H, it is preferable that the constituent fibers are crimped fibers. Further, even if the constituent fibers of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are hydrophilic fibers (including hydrophobic fibers made hydrophilic by a hydrophilizing agent), hydrophobic fibers or water-repellent fibers (water-repellent fibers) are used. (Including water-repellent fibers made water-repellent by an agent). In addition, non-woven fabrics generally have short fiber non-woven fabrics, long fiber non-woven fabrics, spun bond non-woven fabrics, melt blown non-woven fabrics, spun lace non-woven fabrics, thermal bond (air through) non-woven fabrics, and needle punches depending on the fiber length, sheet forming method, fiber bonding method, and laminated structure. Nonwoven fabrics, point-bonded nonwoven fabrics, laminated nonwoven fabrics (such as SMS nonwoven fabrics and SMMS nonwoven fabrics having a melt-blown layer sandwiched between spunbond layers) and the like are all used as the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H. Can be.

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 determined as appropriate, but in general, it is preferably about 1.8 to 6.0 dtex and about 10 to 30 g / m ² , respectively.

(About perforated non-woven 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 having holes 14 penetrating in the thickness direction. As shown in FIGS. 11 and 12, when the inner nonwoven fabric layer 12H on the wearer's skin side 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 touch is eliminated. Can be. In addition, since only one of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H has the hole 14, the skin is not exposed at the time of wearing, and leakage through the hole 14 can be prevented. Although not shown, the inner nonwoven fabric layer 12H on the skin side of the wearer may be a perforated nonwoven fabric, and the outer nonwoven fabric layer 12S may be a nonporous nonwoven fabric. As shown in FIGS. 13 and 14, both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are perforated nonwoven fabrics, and the holes 14 of one perforated nonwoven fabric and the holes 14 of the other perforated nonwoven fabric do not overlap. A structure is also preferred. In this case, by forming both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H as perforated nonwoven fabric, higher air permeability can be obtained. In addition, since the hole 14 of one perforated nonwoven fabric does not overlap with the hole 14 of the other perforated nonwoven fabric, the skin is not exposed at the time of wearing, and leakage through the hole 14 can be prevented. As shown in FIG. 15, both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are perforated nonwoven fabrics, and the holes 14 of one perforated nonwoven fabric and the holes 14 of the other perforated nonwoven fabric are completely or partially formed. May overlap. Although not shown, when both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are perforated nonwoven fabrics, in most (for example, an area of 50% or more), the holes 14 of one perforated nonwoven fabric and the other are not perforated. Although the holes 14 of the perforated nonwoven fabric do not overlap, the holes 14 of one perforated nonwoven fabric and the holes 14 of the other perforated nonwoven fabric may partially overlap.

  The planar shape (opening shape) of each hole 14 can be appropriately determined. The hole 14 has a long hole shape as shown in FIG. 10 (b), a perfect circle as shown in FIG. 10 (e), an elliptical shape, a triangle and a rectangle as shown in FIGS. 10 (a) and 10 (d). , A polygon such as a diamond, a star, a cloud, and the like. Although holes having different shapes may be mixed as shown in FIG. 10C, in this case, it is preferable that the dimensions in the expansion and contraction directions are substantially 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 14L in the orthogonal direction XD (the dimension of the longest part) 14L is preferably 0.3 to 3.0 mm, particularly 0.4 to 1.5 mm. The dimension (longest part dimension) 14W of the ED is preferably 0.3 to 5.0 mm, particularly preferably 0.6 to 2.0 mm. When the shape of the hole 14 is a shape that is long in one direction (a shape in which the total length in one direction is longer than the total length in the direction orthogonal thereto) such as a long hole, an ellipse, a rectangle, and a diamond, the dimension in the longitudinal direction (The dimension of the longest part) is preferably 1.2 to 2.5 times the dimension in the direction orthogonal to this (the dimension of the longest part). When the shape of the hole 14 is long in one direction, the longitudinal direction of the hole 14 is desirably the front-back direction LD, but may be the width direction WD or the oblique direction.

The area and area ratio of each hole 14 may be appropriately determined, but the area is preferably about 0.07 to 11.8 mm ² (particularly 0.19 to 2.4 mm ² ), and the area ratio is 1. It is preferably about 0 to 15.0% (particularly 5.0 to 10.0%).

  The plane arrangement of the holes 14 can be appropriately determined as long as the rows of the holes 14 linearly arranged at intervals in the direction perpendicular to the expansion and contraction direction ED are arranged at intervals in the expansion and contraction direction ED. For example, as shown in FIGS. 10A, 10C, and 10D, the arrangement of the holes 14 is such that the rows of the holes 14 linearly arranged at predetermined intervals in the orthogonal direction XD are spaced at predetermined intervals in the expansion / contraction direction ED. It is preferable that the shape of the matrix is repeated (the positions of holes in the orthogonal direction in each column are the same). In this case, as shown in FIG. 10A, the interval 14x in the expansion / contraction direction ED is arranged to be shorter than the interval 14y in the orthogonal direction XD. In addition, as shown in FIG. 10d, the spacing 14y in the orthogonal direction XD is substantially equal, or as shown in FIG. 10D, the spacing 14x in the expansion / contraction direction ED is longer than the spacing 14y in the orthogonal direction XD. As shown in FIGS. 10B and 10E, the rows of holes 14 linearly arranged at predetermined intervals in the orthogonal direction XD are spaced from each other in the expansion / contraction direction ED and shifted in the orthogonal direction XD. Can be arranged. The example shown in FIG. 10B is a so-called staggered (hexagonal lattice) arrangement in which the arrangement of the holes 14 in the row of the adjacent holes 14 is alternated.

  The space 14y in the orthogonal direction and the space 14x in the expansion / contraction direction of the hole 14 may be constant or may vary. The interval 14y in the orthogonal direction and the interval 14x in the expansion and contraction direction of the hole 14 can be determined as appropriate. However, in consideration of air permeability, 14y is 2.5 to 10.0 mm, 14x is 1.0 to 5.0 mm, and especially 14y is It is desirable that 3.0 to 5.0 mm and 14x be in the range of 1.0 to 2.0 mm.

  The cross-sectional shape of the hole 14 is not particularly limited. For example, as shown in FIGS. 18 (a) to 18 (c), the hole 14 may be a punching type hole whose peripheral edge is formed by a cut end of a fiber as shown in FIG. 18 (d). There may be almost no cut end of the fiber at the periphery of the pin 14, and a pin insertion type hole 14 (having a high fiber density at the edge) formed by inserting a pin between the fibers and expanding the fiber. As shown in FIG. 18D, the hole of the punching type may be such that the diameter of the hole 14 decreases toward the middle in the thickness direction, or may decrease toward the one side in the thickness direction. . Note that the diameter of the hole 14 means a dimension in a direction passing through the center of gravity of the hole and orthogonal to the direction of expansion and contraction (therefore, a circle has a diameter and an ellipse has a long diameter). Further, the decrease in the diameter of the hole 14 in the thickness direction means that the diameter of the hole 14 continues to decrease throughout the thickness direction of the nonwoven fabric layer, and the decrease in the diameter of the hole 14 is almost eliminated in the middle of the thickness direction. Is also included.

  The hole 14 of the pin insertion type is such that the diameter of the hole 14 decreases from the pin insertion side to the opposite side. As shown in FIGS. 18 (a) and (c), the pin insertion type hole has a protrusion at the edge of the hole 14 on the side opposite to the pin insertion side, the fiber being pushed out to the side opposite to the pin insertion side. A portion (burr) 14e is formed, and no protrusion 14e is formed on the pin insertion side, and as shown in FIG. 18B, fibers are inserted into the edge of the hole 14 on the side opposite to the pin insertion side. The protrusion 14e extruded to the opposite side is formed, and the lower protrusion 14e is formed on the pin insertion side. Further, the former type hole 14 has a protrusion 14e having a substantially uniform protrusion height 14h as shown in FIG. 18A, and a protrusion 14e as shown in FIG. This includes an opposing portion having the highest protruding height 14i and an opposing portion opposing in a direction orthogonal to the opposing portion and having the lowest protruding height 14j. The projecting portion 14e is preferably formed in a cylindrical shape continuously in the circumferential direction of the hole, but the projecting portion 14e of part or all of the hole 14 is formed only in a part of the hole 14 in the circumferential direction. Is also good. The protrusion heights 14h, 14i, and 14j (apparent heights measured with an optical microscope without applying pressure) are preferably about 0.2 to 1.2 mm. In addition, 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 14e may change in the circumferential direction of the hole 14.

  For example, when a hole 14 having a shape that is long in one direction as shown in FIGS. 10A, 10B, and 10D is formed by inserting a pin, the fiber at the edge of the hole 14 is displaced outward or vertically. A protrusion (burr) 14e is formed in which the protrusion height 14i of the opposing portion in the longitudinal direction of the hole 14 is higher than the protrusion height 14j of the opposing portion in the direction orthogonal to the longitudinal direction. The protruding portion 14e of the hole 14 may have a lower fiber density than the surrounding portion, but preferably has the same 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 in the usual case, 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. Moreover, the bending resistance in the MD direction (width direction) of the perforated nonwoven fabric is preferably 35 to 100 mm, particularly preferably 40 to 70 mm in a non-porous state before perforation, and 10 to 50 mm in a state after perforation. In particular, it is preferable to be 15 to 40 mm.

(Telescopic area)
On the exterior bodies 12F and 12B, an elongated elastic member 19 is provided between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H, and an elastic region A2 that elastically expands and contracts in the width direction WD as the elastic member 19 expands and contracts is formed. ing. That is, in the stretchable region A2, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H contract with the contraction of the elastic member in a natural length state, and have a large number of folds 80. When the stretchable region A2 extends in the width direction WD, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H extend to a predetermined elongation rate at which the outer nonwoven fabric layer 12S extends without the fold 80. As long as the elastic member 19 is an elongated member, it can be used regardless of a thread shape, a string shape, or a band shape. The elastic member 19 may be made of synthetic rubber or natural rubber.

  At least both ends of the elastic member 19 in the stretching direction ED in the stretching region A2 are fixed to the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H. In fixing the elastic member 19, the elastic member 19 is fixed to the outer nonwoven fabric layer 12 </ b> S and the inner nonwoven fabric layer 12 </ b> H at the position of the sheet joint 70 as a result of the formation of the sheet joint 70 continuous in the orthogonal direction XD described later. It is also included.

  The means for fixing the elastic member 19 is not particularly limited, but it is preferable to use a hot melt adhesive 19H. For example, as shown in FIGS. 11 and 12, after applying a hot melt adhesive 19H intermittently to the outer peripheral surfaces of both ends of the elastic member 19 in the expansion and contraction direction ED by applying means such as a comb gun or a shrink wrap nozzle, The elastic member 19 can be sandwiched between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H. In this case, the elastic member 19 is fixed to the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H via the hot melt adhesive 19H only at both ends of the elastic region 19 in the expansion and contraction direction ED in the expansion and contraction region. As shown in FIG. 13 and FIG. 14, after applying the hot melt adhesive 19H to the disposition positions of both ends of the elastic member 19 in the stretching direction ED on at least one of the opposing surfaces of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H. The elastic member 19 can be interposed between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H. In this case, the hot melt adhesive 19H may be continuous in the orthogonal direction XD as in the illustrated example, or may be intermittently arranged in the orthogonal direction XD. Further, in these cases, the continuous portion of the hot melt adhesive 19H may extend over a plurality of elastic members.

  Further, the fixing position of the elastic member 19 may be the same over the entirety of the elastic region A2 in the orthogonal direction XD, but a part of the area intersecting the plurality of elastic members 19 may be different. For example, it is possible to fix the waist W over the entire length of the elastic member 19 in the direction ED of expansion and contraction.

In the case of a pants-type disposable diaper as shown in the illustrated example, it is desirable that the elastic member 19, that is, the elastic region, be provided in the following portions. That is, between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H at the waist portions W of the exterior bodies 12F and 12B, the plurality of waist elastic members 17 are spaced apart in the front-rear direction so as to be continuous over the entire width direction WD. Attached. One or more of the waist elastic members 17 disposed in the region adjacent to the lower waist portion U may overlap with the inner body 200 or may overlap with the inner body 200 in the width direction. Except for the portions, they may be provided on both sides in the width direction. The waist elastic member 17 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber; in the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to 1. It is preferable to provide about 3 to 22 thread rubbers (about 0 mm ² ) at intervals of 4 to 12 mm, and the elongation rate of the waist W in the width direction WD is 150 to 400%, particularly about 220 to 320%. Preferably it is. Further, the waist portion W does not need to use the waist elastic member 17 having the same thickness in the entire front-back direction LD or to have the same elongation rate. The thickness and the elongation rate may be different.

  Further, between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H in the lower waist portions U of the exterior bodies 12F and 12B, a plurality of lower waist elastic members 15 made of an elongated elastic member are attached at intervals in the front-rear direction. Have been.

The lower waist elastic member 15 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber; in the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , especially 0.1 to 1. It is preferable to provide about 5 to 30 thread rubbers of about 0 mm ² ) at an interval of 1 to 15 mm, especially 3 to 8 mm, whereby the elongation rate in the width direction WD of the lower waist portion U is 200 to 350%, particularly It is preferably about 240 to 300%.

  Further, between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H in the buttocks cover portion C of the rear exterior body 12B, a plurality of cover elastic members 16 made of an elongated elastic member are attached at intervals in the front-rear direction. 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). ^It is preferable to provide about 2 to 10 thread rubbers at an interval of 5 to 40 mm, particularly 5 to 20 mm, and the elongation of the cover in the width direction WD is 150 to 300%, particularly 180 to 260. %.

  When a groin cover portion is provided on the front exterior body 12F, a cover elastic member can be similarly provided.

(Non-stretchable area)
When the elastic members 15 and 16 are provided in the front-rear direction range having the absorber 56 like the lower waist portion U and the buttocks cover portion C in the illustrated example, a part or all of the elastic members 15 and 16 in the width direction WD of the absorber 56 are used. In order to prevent shrinkage, the middle in the width direction (preferably including the entire inner / outer joint 201) including a part or all of the portion overlapping the absorber 56 in the width direction WD is defined as a non-stretchable region A1, and its width direction Both sides are set as the elastic area A2. It is preferable that the waist portion W be an elastic region A2 over the entire width direction WD. However, like the waist lower portion U, a non-elastic region A1 may be provided at the middle in the width direction.

  The stretchable region A2 and the non-stretchable region A1 supply the elastic members 15 and 16 between the inner nonwoven fabric layer 12H and the outer nonwoven fabric layer 12S, and connect the elastic members 15 and 16 to at least both ends of the stretchable region A2 in the stretchable direction ED. The elastic members 15 and 16 are fixed by pressing the elastic members 15 and 16 at one portion in the width direction middle in the region that becomes the non-stretchable region A1 without fixing in the region that becomes the non-stretchable region A1. It can be constructed by cutting by heating, or by cutting substantially the entire elastic members 15 and 16 finely by applying pressure and heating, and by killing the elasticity in the non-stretchable region A1 while leaving the elasticity in the elastic region A2. . In the former case, as shown in FIG. 4, in the non-stretchable area A1, the outer non-woven fabric is used in a state where the remaining cut portion continuous from the elastic members 15 and 16 in the stretchable area A2 is contracted to the natural length by itself as an unnecessary elastic member 18. In the latter case, although not shown, the cutting remaining portion continuous from the elastic members 15 and 16 in the elastic region A2 and the elastic members 15 and 16 in both the elastic regions A2 are connected. The cut piece of the elastic member that does not remain as an unnecessary elastic member alone and contracts to its natural length, and remains between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H.

(Joint structure of outer nonwoven fabric layer and inner nonwoven fabric layer)
As shown in FIGS. 11 and 12, the elastic region A2 has a sheet bonding portion 70 in which the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are bonded via the hot melt adhesive 14H. The agent 14H is applied in a striped pattern continuous in the orthogonal direction XD at intervals in the stretching direction ED. As described above, when the sheet joining portions 70 formed of the hot melt adhesive 14H are formed at intervals in the expansion and contraction direction ED, air permeability and flexibility are improved. In addition, when the sheet bonding portion 70 is formed by applying the hot melt adhesive 14H at intervals in the expansion and contraction direction ED and in a striped pattern that is continuous in the orthogonal direction XD, In a somewhat contracted state, as shown in FIG. 19, the sheet joint portion 70 is a continuous groove in a direction orthogonal to the expansion / contraction direction ED, and the non-joint portion 71 between the grooves is the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H. Bulge in opposite directions (on both sides) to the same extent to form folds. The hot melt adhesive 14H may be continuous over the entirety of the elastic region A2 in the orthogonal direction XD, but is continuous only in a part of the area intersecting the plurality of elastic members 19 (for example, only the area excluding the waist part). You may.

  Characteristically, as shown in FIG. 17, the perforated nonwoven fabric (the outer nonwoven fabric layer in the examples shown in FIGS. 11 and 12) is provided on each of the non-bonded portions 71 with the first sheet-bonded portion 70 closest to the first sheet bonded portion 70. , A second row of holes 92 closest to the other sheet bonding portion 70, and one or more third holes 93 positioned between them. The distance between the first hole row 91 and the sheet joining portion 70 adjacent thereto in the expansion / contraction direction ED is set as a first interval, and the second hole row 92 and the sheet joining portion 70 adjacent thereto are connected to each other. Assuming that the interval in the expansion and contraction direction ED is the second interval, the difference (absolute value) between the first interval 91d and the second interval 92d is not more than the dimension 14W of the hole 14 in the expansion and contraction direction ED. . When the arrangement of the holes 14 is based on the linear rows of the holes 14 as in the present elastic structure, and there are three or more rows of the holes 91 to 93 in each fold 80, the case where the rows of the holes 14 are one row Thus, the shape of the fold 80 does not become a sharp inverted V-shape, but becomes a gently bent shape. Further, the perforated nonwoven fabric of this elastic structure has a row of holes 91 and 92 located closest to the sheet joint 70 (and thus does not include a part in contact with or overlapping with the sheet joint 70) in each non-joined part 71. The difference between the gap (the first gap 91d and the second gap 92d) between the sheet joining portion 70 adjacent to the hole 14 is small, and is equal to or less than the dimension 14W of the hole 14 in the expansion / contraction direction ED. For this reason, the bases (portions corresponding to the first interval and the second interval) supporting the fold 80 are substantially symmetrical with respect to the center in the expansion and contraction direction ED, and the fold 80 having a uniform appearance is formed. Further, in the present stretchable structure, since there are three or more rows 91 to 93 of the holes 14 in each fold 80, the space between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H in each fold 80 and the outside The air permeability is also improved.

  The difference between the first interval 91d and the second interval 92d may be equal to or less than the dimension 14W of the hole 14 in the expansion / contraction direction ED, and is more preferably equal to or less than 1/2 of the dimension 14W of the extension / extension direction ED of the hole 14. Needless to say, it is particularly preferably zero. As a specific numerical value, the difference between the first interval 91d and the second interval 92d is preferably 3 mm or less.

  The first space 91d and the second space 92d can be determined as appropriate, but are usually 1/10 to 1/3 times the dimension of the non-joined portion 71 in the expansion and contraction direction ED, particularly 1/4 to 1/1. Preferably it is 6 times.

  The row 93 of the third holes may be a single row as shown in the illustrated example, or a plurality of rows may be provided. The spacing of the rows of holes 14 in the expansion / contraction direction ED may be constant or may vary. In particular, the third row of holes 93 includes a row positioned at the center of the non-bonded portion 71 in the expansion and contraction direction ED, and the arrangement of the holes 14 in each non-bonded portion 71 is It is preferable that the center of the fold 80 be hardly displaced with respect to the center, and the fold 80 linearly extends in the orthogonal direction XD, so that it is easy to be neatly arranged.

  Further, when the diameter of each hole 14 in the perforated nonwoven fabric decreases from the side opposite to the side of the facing nonwoven layer (the inner nonwoven layer 12H in the example shown in FIGS. 11 and 12) toward the side of the facing nonwoven layer, In the hole 14 and the vicinity thereof, the surface opposite to the nonwoven fabric layer that is opposed to the hole 14 is easily broken so as to form a valley fold. This easiness of folding is opposite to the direction in which the perforated nonwoven fabric bends when the fold 80 is formed. Therefore, the perforated nonwoven fabric is easy to bend at the portion having the holes 14, but the tendency is weakened, so that the influence of the arrangement of the holes 14 on the shape of the folds 80 is reduced. , Giving a more organized appearance.

  When the row of the holes 14 and the application portion of the hot-melt adhesive 14H for forming the sheet bonding portion 70 overlap with each other, the outer non-woven fabric layer 12S and the inner non-woven fabric layer 12H are not bonded to the portion to become the sheet bonding portion 70. Many parts are formed. With such a missing portion of the sheet joint portion 70, large irregularities are also formed on the side edges of the fold 80, and it is easy to partially merge with the adjacent fold 80, so that it is difficult to obtain a straight and uniform appearance. . Further, when the sheet joining portion 70 has a missing portion, the sheet joining portion 70 is more likely to be peeled than simply reducing the area of the sheet joining portion 70 because stress is likely to concentrate. Therefore, as shown in FIG. 11 and FIG. 17A, it is preferable that the elastic structure does not have the hole 14 overlapping the hot melt adhesive 14 </ b> H for forming the sheet joint 70. As a result, there is substantially no adverse effect on the shape of the fold 80 due to the missing portion and no adverse effect on the strength of the sheet joint portion 70.

  Of course, as shown in FIG. 16 and FIG. 17B, a row 94 of the holes 14 may be provided which overlaps with the application portion of the hot melt adhesive 14H for forming the sheet bonding portion 70. In this case, as in the illustrated example, it is desirable that all of the holes 14 overlapping with the application portion of the hot melt adhesive 14H be completely contained in the application portion of the hot melt adhesive 14H. When the hole 14 overlapping with the hot melt adhesive 14H application part is protruding from the hot melt adhesive 14H application part, the center of the expansion and contraction direction of the hole 14 is the center of the expansion and contraction direction of the hot melt adhesive 14H application part. It is desirable to be located at the center.

  However, when manufacturing the present stretchable structure using a ready-made perforated nonwoven fabric, since accurate positioning is difficult, it is inevitable that some of the bonding lines and the rows of the holes 14 overlap with each other. It is difficult to reliably avoid the formation of the missing portion. Therefore, the interval 14y in the orthogonal direction XD of the holes 14 in the row of the holes 14 is wider than the dimension 14L of the holes 14 in the orthogonal direction XD, and is particularly 3 to 20 times the dimension 14L of the holes 14 in the orthogonal direction XD. preferable. As a result, even if a missing portion is formed in a part of the sheet joining portion 70, the ratio of the missing portion in the orthogonal direction XD of the sheet joining portion 70 is less than half, so that the shape of the fold 80 due to the missing portion is reduced. And the adverse effect on the strength of the sheet joint 70 can be further reduced. A more preferable range is that the distance 14y between the holes 14 in the row X in the orthogonal direction XD is 3 to 10 times the dimension 14L of the hole 14 in the orthogonal direction XD.

  It is also preferable that the interval 14y in the orthogonal direction XD of the holes 14 in the row of the holes 14 is equal to or greater than the interval 19y in the orthogonal direction XD of the elastic member 19. Thereby, since there is only one or less hole 14 in each row in all the regions between the adjacent elastic members 19, the change in the ease of bending due to the presence or absence of the hole 14 is small, and the folds are more ordered. 80 is easily formed.

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

  The hole 14 and the sheet joining portion 70 can be provided only in the stretchable region A2, but can be provided over a wider range including the non-stretchable region A1 as in the examples shown in FIGS.

  The sheet bonding portion 70 of the above example is a portion where the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are bonded via the hot melt adhesive 14H, but a portion where the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are welded. There may be. That is, in forming the sheet bonding portion 70, the welding of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H may be performed in a striped pattern spaced in the expansion and contraction direction ED and continuous in the orthogonal direction XD. In this case, the elastic member 19 may or may not be welded to the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H at the position where the elastic member 19 passes. In any case, in order to weld the outer non-woven fabric layer 12S and the inner non-woven fabric layer 12H with the elastic member 19 interposed therebetween, the fused portions of the outer non-woven fabric layer 12S and the inner non-woven fabric layer 12H are combined with the outer non-woven fabric layer 12S and the inner non-woven fabric layer. At least one of 12H is continuous in the orthogonal direction XD.

  Further, the pattern of bonding or welding (pattern of the sheet bonding portion) may be a pattern such as a staggered pattern that is intermittent in both the expansion and contraction direction and the orthogonal direction.

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

  "The front-back direction" means the direction (longitudinal direction) indicated by the symbol LD in the figure, and the "width direction" means the direction (left-right direction) shown by WD in the figure. Are orthogonal.

  "MD direction" and "CD direction" mean the flow direction (MD direction) and the transverse direction (CD direction) perpendicular to the flow direction in the manufacturing equipment, and one of them is the front-back direction, and the other is the other direction. Is the width direction. The MD direction of the nonwoven fabric is the direction of the fiber orientation of the nonwoven fabric. The fiber orientation is a direction along which the fibers of the non-woven fabric are along. For example, the fiber orientation is measured from a measurement method according to the fiber orientation test method based on the zero-distance tensile strength of TAPPI standard method T481, or from the tensile strength ratio in the front-rear direction and the width direction. The determination can be made by a simple measurement method for determining the orientation direction.

  ・ "Front side" means closer to the wearer's skin when wearing a pants-type disposable diaper, and "Back" means farther from the wearer's skin when wearing a pants-type disposable diaper. .

  ・ "Surface" means the side of the member that is closer to the wearer's skin when wearing the pants-type disposable diaper, and "Back" means from the wearer's skin when wearing the pants-type disposable diaper Means the far side.

  "Center" with respect to a closed planar shape means the center of gravity in the case of a figure having no 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 (for example, the hole) in the target region (for example, the nonwoven fabric) by the area of the target region. is there. In a mode in which a large number of target portions are provided at intervals, it is desirable to set the target region to a size that includes ten or more target portions and determine the area ratio. For example, the area ratio of the holes can be measured by the following procedure, using, for example, VHX-1000 (trade name, manufactured by KEYENCE) and setting the measurement condition to 20 times.
(1) Set on a 20x lens and adjust the focus. Adjust the position of the nonwoven so that the holes enter 4 × 6.
(2) Designate the brightness of the hole area and measure the area of the hole.
(3) Click the color extraction of “Area measurement” of “Measurement / comment”. Click on the hole.
(4) Click “Batch measurement”, check “Display measurement result window”, and save as CSV data.

  -"Elongation rate" means the value when the natural length is 100%. For example, an elongation ratio of 200% is synonymous with an elongation ratio of twice.

  "Gel strength" is measured as follows. Artificial urine (urea: 2 wt%, sodium chloride: 0.8 wt%, calcium chloride dihydrate: 0.03 wt%, magnesium sulfate heptahydrate: 0.08 wt%, and ion-exchanged water: 97.09 wt%) 1.0 g of superabsorbent polymer was added to 49.0 g of the mixture, and the mixture was stirred with a stirrer. The resulting gel is left in a constant temperature / humidity bath at 40 ° C. × 60% RH for 3 hours and then returned to normal temperature, and the gel strength is measured with a card meter (Curdmeter-MAX ME-500, manufactured by I. techno Engineering).

  ・ "Cost" is measured as follows. After pre-drying the sample or test piece, the sample or test piece is left in a test room or apparatus in a standard state (the test place is at a temperature of 23 ± 1 ° C. and a relative humidity of 50 ± 2%) to make it a constant weight state. Predrying refers to making a sample or a test piece a constant weight in an environment at a temperature of 100 ° C. Preliminary drying may not be performed for fibers having an official moisture content of 0.0%. A sample having a size of 100 mm x 100 mm is cut out from the test piece in a constant weight state using a template for sampling (100 mm x 100 mm). The weight of the sample is measured, multiplied by 100 to calculate the weight per square meter, and used as the basis weight.

- "thickness" is used automatic thickness measuring instrument (KES-G5 Handy Compression measurement program), load: 0.098 N / cm ^2, and the pressure area: automatically measured under the conditions of 2 cm ^2.

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

  -The water absorption is measured according to JIS K7223-1996 "Testing method for water absorption of superabsorbent resin".

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

  -The "deployed state" means a state in which it is flattened without shrinkage or loosening.

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

  -If there is no description about the environmental conditions in the test or measurement, the test or measurement shall be performed in a test room or apparatus in a standard condition (the test location is 23 ± 1 ° C and 50 ± 2% relative humidity). I do.

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

  11: liquid impermeable sheet, 12: outer package, 12A: side seal portion, 12B: rear package, 12F: front package, 12H: inner nonwoven layer, 12S: outer nonwoven layer, 14: hole, 14e ... Projecting portion, 18: unnecessary elastic member, 19: elastic member, 14H, 19H: hot melt adhesive, 20: cover nonwoven fabric, 200: interior body, 201: inside / outside joint, 30: top sheet, 40: intermediate sheet, 50 ... absorbing element, 56 ... absorber, 58 ... wrapping sheet, 60 ... rising gather, 62 ... gather nonwoven fabric, A1: non-stretchable area, A2 ... stretchable area, C ... buttocks cover part, L ... middle area, LD ... front and rear direction , LO: leg opening, T: waist circumference region, U: lower waist, W: waist, WD: width direction, WO: waist opening, 70: seat joint, 71: non-joint, XD: orthogonal direction ED ... stretching direction, 80 ... folds, 91 ... row of first holes, 92 ... row of second holes, 93 ... row of third holes, 91d ... first interval, 92d ... second intervals.

Claims (8)

A first nonwoven fabric layer and a second nonwoven fabric layer that partially or entirely overlap with each other, and are arranged between the first nonwoven fabric layer and the second nonwoven fabric layer at intervals in a direction perpendicular to the direction of expansion and contraction, along the direction of expansion and contraction; Having a plurality of elongated elastic members extending,
The elastic member has at least both ends in the stretching direction in the stretching region fixed to the first nonwoven fabric layer and the second nonwoven fabric layer,
The stretchable region has a sheet joining portion in which the first nonwoven fabric layer and the second nonwoven fabric layer are joined by adhesion or welding,
At least one of the first nonwoven fabric layer and the second nonwoven fabric layer is a perforated nonwoven fabric in which holes penetrating in a thickness direction are arranged.
In the elastic structure of disposable wearing articles,
The array of holes, the row of holes arranged linearly at intervals in the orthogonal direction, are arranged at intervals in the expansion and contraction direction,
The bonding or welding is intermittent in the expansion and contraction direction, and is made in a continuous or intermittent pattern in the orthogonal direction,
Between the sheet bonding portion in the expansion and contraction direction, the first nonwoven fabric layer and the second nonwoven fabric layer are non-bonded portions that are not bonded,
The perforated nonwoven fabric includes, for each of the non-joined portions, a row of first holes near the sheet joining portion on one side, a row of second holes near the sheet joining portion on the other side, One or more rows of third holes located therebetween; and
The distance between the first row of holes and the sheet joint adjacent thereto in the expansion and contraction direction is a first distance, and the expansion and contraction of the second row of holes and the adjacent sheet joint is adjacent to each other. When the interval in the direction is the second interval, the difference between the first interval and the second interval is equal to or less than the dimension of the hole in the expansion and contraction direction.
An elastic structure of a disposable wearing article characterized by the following. The row of the third holes includes a row located at the center of the non-joined portion in the expansion and contraction direction,
The arrangement of the holes in each non-joined portion is line-symmetric with respect to the center in the stretching direction at each non-joined portion,
The elastic structure of the disposable wearing article according to claim 1. The diameter of each hole in the perforated nonwoven fabric is smaller as it goes from the opposite nonwoven fabric layer side to the opposite nonwoven fabric layer side,
An elastic structure of the disposable wearing article according to claim 1 or 2. The orthogonal spacing of the holes in the row of holes is 3 to 20 times the orthogonal dimension of the holes.
An elastic structure of the disposable wearing article according to claim 1. Does not have a hole that overlaps the part where the bonding or welding process was performed,
An elastic structure of the disposable wearing article according to any one of claims 1 to 4. The hole has a dimension in the expansion and contraction direction of 0.3 to 3.0 mm and a dimension in the orthogonal direction of 0.3 to 5.0 mm,
An interval of the holes in the row in the orthogonal direction is 2.5 to 10.0 mm,
An interval of the row in the expansion and contraction direction is 1.0 to 5.0 mm;
The dimension of the sheet joint in the stretching direction is 0.5 to 4 mm,
The interval between the sheet joining portions in the stretching direction is 4 to 8 mm,
An elastic structure of the disposable wearing article according to any one of claims 1 to 5. Of the first nonwoven layer and the second nonwoven layer, the nonwoven layer on the wearer's skin side is a non-porous nonwoven, and the opposite nonwoven layer is the perforated nonwoven.
An elastic structure of the disposable wearing article according to any one of claims 1 to 6. An integrated exterior body that extends from the front to the rear, or an exterior body that is separately provided on the front and the rear, and an interior body that is attached to the widthwise middle part of this exterior body and extends over the front and rear sides of the crotch A side seal portion in which both sides of the exterior body in the front body and both sides of the exterior body in the back body are joined, a waist opening and a pair of left and right leg openings,
The said exterior body in at least one of the said front body and a back body extends over the width direction range corresponding to between the said side seal parts in at least one part range of the front-back direction, The Claims any one of Claims 1-7. The telescopic structure is provided so that the telescopic direction of the telescopic region is the width direction.
Pants-type disposable wearing article characterized by the above-mentioned.

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