JP2019170556A - Stretchable structure for disposable wearing article and pants-type disposable wearing article with such stretchable structure - Google Patents

Abstract

To provide a stretchable structure for an absorbent article using a porous nonwoven fabric, which prevents the appearance of pleats from getting worse while adopting a stripe-shaped adhesion pattern.SOLUTION: A stretchable structure for a disposable wearing article has a plurality of elongated elastic members 19 extending in a stretch direction ED and spaced in a perpendicular direction XD orthogonal to the stretch direction ED between an outer nonwoven fabric layer 12S and an inner nonwoven fabric layer 12H. At least one of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H is a porous 14 nonwoven fabric in which pores 14 extending therethrough in the thickness direction are arranged. The pores 14 are arranged such that columns of the pores 14 arranged in the perpendicular direction XD are spaced in the stretch direction ED. Hotmelt adhesive 14H is applied in a striped pattern spaced in the stretch direction ED and continued in the perpendicular direction XD. An interval 14y of pores 14 in the perpendicular direction XD in the columns of pores 14 is wider than the dimension 14L of the pores in the perpendicular direction XD.SELECTED DRAWING: Figure 11

Description

  The present invention relates to a stretchable structure for a disposable wearing article, and a pants-type disposable wearing article having the stretchable 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 a disposable diaper of a pants type or a tape type, it is widely performed to provide a stretchable structure in the waistline direction at the waistline part or to provide a stretchable structure in a direction along the leg circumference at the leg circumference part. . Furthermore, in addition to pants-type and tape-type disposable diapers, a wide range of disposable wearing articles including sanitary napkins are also widely used to provide longitudinal stretch structures called three-dimensional gathers and flat gathers (for example, patents). References 1-3).

  A typical example of such a stretchable structure for a disposable wearing article is an elongated elastic member provided between the overlapping first nonwoven fabric layer and the second nonwoven fabric layer along the stretch direction and spaced from each other. It is to be prepared. The first non-woven fabric layer and the second non-woven fabric layer form a planar stretchable region and play a role of covering and concealing the elastic member, and the elastic member incorporated between the first non-woven fabric layer and the second non-woven fabric layer is elastic stretch It plays the role of generating power for The elastic member is fixed in the first nonwoven fabric layer and the second nonwoven fabric layer at least at both ends of the stretchable region in the stretched state. By this fixing, the elastic member, the first nonwoven fabric layer, and the second nonwoven fabric layer are integrated, and the first nonwoven fabric layer and the second nonwoven fabric layer are contracted by the contracting force of the elastic member to include wrinkles. When the elastic member is stretched not only in the natural length state but also in the stretched state (hereinafter also referred to simply as heel), and when stretched against the contraction force of the elastic member from this contracted state, Is expanded. Usually, the first nonwoven fabric layer and the second nonwoven fabric layer are in a developed state having no wrinkles at the limit of elastic elongation, wrinkles are accompanied with the contraction of the elastic member, and wrinkles are most closely gathered 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 with respect to the other nonwoven fabric layer, thereby causing unnecessary wrinkles and swelling. Since there exists a possibility that it may arise, the 1st nonwoven fabric layer and the 2nd nonwoven fabric layer need to be joined directly or indirectly over the whole. Moreover, in order to produce elasticity by an elastic member, an elastic member is extended over the whole expansion-contraction direction of an expansion-contraction area | region, and the part located in the both ends of the expansion-contraction direction of an expansion-contraction area | region is a 1st nonwoven fabric layer and a 2nd nonwoven fabric layer In the natural length state, the first nonwoven fabric layer and the second nonwoven fabric layer need to be contracted as the elastic member contracts. That is, it is necessary to join 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 form between the first nonwoven fabric layer and the second nonwoven fabric layer is often performed by welding such as ultrasonic welding in order to reduce the amount of hot melt adhesive used. The form performed by is also used persistently. For example, by joining the first nonwoven fabric layer and the second nonwoven fabric layer via a hot melt adhesive at the passing position of the elastic member, the first nonwoven fabric layer and the second nonwoven fabric layer can be joined. The first nonwoven fabric layer and the second nonwoven fabric layer via a hot melt adhesive that is intermittently arranged in the stretching direction and continues in the direction orthogonal to the stretching direction, in addition to the combined use of fixing 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 that is intermittently arranged in a direction orthogonal to the stretching direction and that is substantially continuous in the stretching direction. It has been. (See Patent Documents 1 to 6)

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

  Among these, the ones described in Patent Documents 7 and 8 are bonded to the first nonwoven fabric layer and the second nonwoven fabric layer by an adhesive applied in the form of a spiral or stripe on the entire surface of one nonwoven fabric layer, and the first nonwoven fabric layer. And the elastic member is fixed to the second nonwoven fabric layer. Moreover, 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 the thing of patent document 7, 8, since joining of a 1st nonwoven fabric layer and a 2nd nonwoven fabric layer will become the whole surface when an adhesion pattern is spiral shape, while the air permeability in parts other than a hole falls, it is flexible. May also be reduced (stiffness will be increased). Therefore, from the viewpoint of air permeability and flexibility, the adhesive pattern is preferably a striped pattern in which coating lines extending in a direction perpendicular to the expansion / contraction direction are repeatedly provided at intervals in the expansion / contraction direction. It is desirable that the width of the coating line be as narrow as possible. Furthermore, when the adhesive pattern is striped, the sheet joint portion to which the first nonwoven fabric layer and the second nonwoven fabric layer are bonded becomes a groove continuous in a direction orthogonal to the expansion / contraction direction, and the non-adhesive portion between the grooves The first nonwoven fabric layer and the second nonwoven fabric layer bulge to the same extent in opposite directions (on both front and back sides) to form wrinkles. In this case, since the portion between the ridges and the inner space of the ridges are continuous in the direction orthogonal to the expansion / contraction direction, not only is the air permeability in the direction orthogonal to the expansion / contraction direction excellent, but the appearance is also preferable due to the formation of the aligned ridges. It will be a thing.

  However, when using a nonwoven fabric in which holes penetrating in the thickness direction are formed in advance, the following problems arise when the adhesive pattern is striped. That is, in this case, since it is difficult to accurately match the position where the adhesive is applied and the position of the hole, a part of the adhesive applied line may overlap the hole row. If there is an overlap between the adhesive application line and the hole array, the first nonwoven fabric layer and the second nonwoven fabric layer are naturally not adhered to the portion of the adhesive application line that overlaps the hole. In other words, the sheet bonding portion formed at the position overlapping the row of holes not only reduces the bonding area, but also loses the position overlapping the hole and becomes a dotted line, or a concave missing portion at the edge of the bonding portion. Will be formed. Here, the heels rise from the edge of the sheet joint, so if there is a missing part in the sheet joint, the side edges of the heel will be uneven or partly merged with the next heel , The appearance of the cocoon may be deteriorated.

  In addition, when the sheet bonding portion has a missing portion, the bonded portion is more easily peeled off than the area of the sheet bonding portion simply decreases due to a tendency of stress concentration. And when peeling of such an adhesive part generate | occur | produces, there exists a possibility that the deterioration of the external appearance of a wrinkle may become still more remarkable by collapse of a part or the whole wrinkles.

JP 2004-229857 A JP 2013-132331 A JP 2014-209773 A JP 2017-064126 A Japanese Unexamined Patent Publication No. 2017-064133 JP 2017-164034 A Japanese Patent Laying-Open No. 2015-107223 JP-A-2015-128573 Japanese Patent Laying-Open No. 2015-192862

  Then, the main subject of this invention is in suppressing the deterioration of the external appearance of a wrinkle, adopting a striped adhesive pattern in the expansion-contraction structure of the absorbent article using a perforated nonwoven fabric.

The stretchable structure of the disposable wearing article that has solved the above problems is as follows.
<First aspect>
Along the stretch direction, the first nonwoven fabric layer and the second nonwoven fabric layer, which are partly or entirely overlapped, and arranged between the first nonwoven fabric layer and the second nonwoven fabric layer with an interval in the orthogonal direction perpendicular to the stretch direction. A plurality of elongated elastic members extending
The elastic member is fixed to the first nonwoven fabric layer and the second nonwoven fabric layer at least at both ends in the stretchable direction in the stretchable region,
The stretchable region has a sheet joining portion in which the first nonwoven fabric layer and the second nonwoven fabric layer are joined via a hot melt adhesive,
At least one of the first nonwoven fabric layer and the second nonwoven fabric layer is a perforated nonwoven fabric in which holes penetrating in the thickness direction are arranged.
In the elastic structure of disposable wearing articles,
The array of holes is an array of holes arranged at intervals in the orthogonal direction, and arranged at intervals in the expansion and contraction direction,
The hot melt adhesive is applied in a striped pattern that is spaced in the stretch direction and continuous in the orthogonal direction,
The orthogonal spacing of the holes in the array of holes is wider than the orthogonal dimension of the holes;
A stretchable structure for a disposable wearing article.

(Function and effect)
In this stretchable structure, the sheet-bonded portion by the hot-melt adhesive is formed in a striped pattern that is spaced in the stretch direction and continuous in the orthogonal direction, so that good breathability and flexibility can be ensured. it can.

  In addition, when the sheet joint is formed by applying a hot melt adhesive in a striped pattern that is spaced in the orthogonal direction and continuous in the orthogonal direction, the sheet is contracted to some extent including the natural length state. Then, the sheet joint portion becomes a groove continuous in a direction orthogonal to the expansion and contraction direction, and the first nonwoven fabric layer and the second nonwoven fabric layer bulge in opposite directions (on both sides) at the non-joint portion between the grooves. A cocoon is formed.

  On the other hand, as described above, when the present stretchable structure is manufactured using a ready-made perforated nonwoven fabric, a portion to be a sheet joint portion is formed by overlapping some hot melt adhesive application lines and a row of holes. There is a possibility that a large number of missing portions where the first nonwoven fabric layer and the second nonwoven fabric layer are not joined are formed. Here, when the interval in the direction perpendicular to the holes in the row of holes is narrower than the dimension in the direction perpendicular to the holes, the sheet joint becomes a dotted line that is interrupted via a long missing part, or a long concave shape at the edge of the sheet joint A large number of missing portions will be formed. Thus, when the omission of the sheet joint portion becomes large, large side irregularities are formed on the side edges of the ridges, and it is easy to partially merge with the adjacent ridges.

  On the other hand, if the gap in the direction perpendicular to the holes in the row of holes is larger than the dimension in the direction perpendicular to the holes, even if a missing portion is formed in some of the sheet joints, Since the ratio of the missing part is less than half, the influence of the missing part on the shape of the ridge is smaller. Therefore, even if unevenness is formed on the side edge of the ridge or when it partially merges with the adjacent ridge, the degree can be suppressed.

<Second aspect>
The interval in the expansion / contraction direction of the row of holes is smaller than the interval in the expansion / contraction direction of the sheet joint portion,
The expansion-contraction structure of the disposable wearing article of a 1st aspect.

(Function and effect)
In the case of this aspect, since one or more holes exist in each ridge, the air permeability between the first nonwoven fabric layer and the second nonwoven fabric layer in each ridge and the outside is improved. In addition, if the interval in the expansion / contraction direction of the hole rows is narrowed in this way, the probability that the adhesive coating line overlaps the hole rows increases, but even in this case, the holes in the hole rows as described above. Since the interval in the orthogonal direction is wider than the dimension in the orthogonal direction of the hole, the shape of the ridge can be prevented from being deformed.

<Third Aspect>
The orthogonal spacing of the holes in the array of holes is 3 to 20 times the orthogonal dimension of the holes,
The elastic structure of the disposable wearing article of the 1st or 2nd aspect.

(Function and effect)
The interval in the orthogonal direction of the holes in the row of holes can be determined as long as it is wider than the dimension in the orthogonal direction of the holes, but if it is 3 times or more as in this aspect, the missing portion (overlaps with the hole) of the sheet joint portion Even if irregularities are formed on the side edges of the ridges or partially merged with the adjacent ridges, they become almost inconspicuous. Moreover, when the space | interval of the orthogonal direction of a hole in the row | line | column of a hole exceeds 20 times the dimension of the orthogonal direction of a hole, the number of the holes per unit area will decrease, and the profit which employ | adopts a perforated nonwoven fabric will become scarce.

<Fourth aspect>
The perforated nonwoven fabric is one in which a protruding portion is formed at the edge of the hole on the opposite nonwoven fabric layer side.
The elastic structure of the disposable wearing article according to any one of the first to third aspects.

(Function and effect)
As in this embodiment, when the protrusion is formed at the edge of the hole on the opposite nonwoven fabric layer side, when the hot melt adhesive coating line and the hole overlap, the protrusion at the edge of the hole Since the portion to be included is bonded by the hot melt adhesive, the hot melt adhesive bites better, and the adhesive strength is higher than when there is no protrusion. In addition, the perforated nonwoven fabric is separated from the opposing nonwoven fabric by the amount of the protruding portion, so that the hot melt adhesive exposed from the hole when touching the surface opposite to the opposing nonwoven fabric side is difficult to touch the hand. There are also advantages.

<Fifth aspect>
The hole has a dimension in the stretching direction of 0.3 to 5.0 mm, a dimension in the orthogonal direction of 0.3 to 3.0 mm,
The orthogonal spacing of the holes in the row is 2.5-10.0 mm;
The interval in the stretch direction of the row is 1.0 to 5.0 mm,
The dimension of the sheet joint in the stretching direction is 0.5-4 mm,
The interval between the sheet joints in the stretching direction is 4 to 8 mm.
The elastic structure of the disposable wearing article of any one aspect of the 1st-4th.

(Function and effect)
As described above, when the sheet bonding portion has a missing portion, the bonded portion is more easily peeled off than the area of the sheet bonding portion simply decreases due to the tendency of stress concentration. And when peeling of such an adhesive part generate | occur | produces, there exists a possibility that the deterioration of the external appearance of a wrinkle may become still more remarkable by collapse of a part or whole of a wrinkle. On the other hand, when the arrangement of the holes and the sheet bonding portion is within the range of this aspect, even if the sheet bonding portion has a missing portion, it is difficult to peel off.

<Sixth aspect>
The hole array of the perforated nonwoven fabric is a matrix in which a row of holes linearly arranged at a predetermined interval in the orthogonal direction repeats at a predetermined interval in the expansion / contraction direction,
The elastic structure of the disposable wearing article according to any one of the first to fifth aspects.

(Function and effect)
Since the perforated nonwoven fabric is easy to bend at the portion having holes, the perforated non-woven fabric tends to be particularly neatly arranged in a matrix arrangement as in this embodiment.

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

(Function and effect)
By making the nonwoven fabric layer on the skin side a non-porous nonwoven fabric, it is possible to eliminate the influence of the pores on the touch. Moreover, 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. In addition, when both the first nonwoven fabric layer and the second nonwoven fabric layer are perforated nonwoven fabrics, and there is a possibility that the holes and the holes overlap, the application line of the hot melt adhesive overlaps the portion where the holes and the holes overlap. Therefore, the hot melt adhesive may protrude into the holes and cause problems such as wearing feeling, and thus this embodiment is particularly preferable.

<Eighth aspect>
Both the first nonwoven fabric layer and the second nonwoven fabric layer are the perforated nonwoven fabric, and the holes of one perforated nonwoven fabric do not overlap with the holes of the other perforated nonwoven fabric,
The elastic structure of the disposable wearing article according to any one of the first to seventh aspects.

(Function and effect)
In this aspect, by making both the nonwoven fabric layers porous porous fabrics, higher air permeability can be obtained. Moreover, since the hole of one perforated nonwoven fabric and the hole of the other perforated nonwoven fabric do not overlap, skin is not exposed at the time of mounting | wearing, and the leak through a hole can be prevented. In addition, when both the first nonwoven fabric layer and the second nonwoven fabric layer are perforated nonwoven fabrics, and there is a possibility that the holes and the holes overlap, the application line of the hot melt adhesive overlaps the portion where the holes and the holes overlap. Therefore, the hot melt adhesive may protrude into the holes and cause problems such as wearing feeling, and thus this embodiment is particularly preferable.

<Ninth aspect>
Along the stretch direction, the first nonwoven fabric layer and the second nonwoven fabric layer, which are partly or entirely overlapped, and arranged between the first nonwoven fabric layer and the second nonwoven fabric layer with an interval in the orthogonal direction perpendicular to the stretch direction. A plurality of elongated elastic members extending
The elastic member is fixed to the first nonwoven fabric layer and the second nonwoven fabric layer at least at both ends in the stretchable direction in the stretchable region,
The stretchable region has a sheet joint portion to which the first nonwoven fabric layer and the second nonwoven fabric layer are welded,
At least one of the first nonwoven fabric layer and the second nonwoven fabric layer is a perforated nonwoven fabric in which holes penetrating in the thickness direction are arranged.
In the elastic structure of disposable wearing articles,
The array of holes is an array of holes arranged at intervals in the orthogonal direction, and arranged at intervals in the expansion and contraction direction,
The welding is performed in a striped pattern that is spaced in the stretch direction and continuous in the orthogonal direction;
The orthogonal spacing of the holes in the array of holes is wider than the orthogonal dimension of the holes;
A stretchable structure for a disposable wearing article.

(Function and effect)
This aspect is different from the first aspect in that the sheet bonding portion is formed by welding, but the other aspects are the same as those of the first aspect, including the effects.

<Tenth aspect>
An integrated exterior body from the front body to the back body, or an exterior body provided separately for the front body and the back body, and an interior body that is attached to the middle part in the width direction of the exterior body and covers both the front and back of the crotch part A side seal part in which both sides of the outer body of the front body and both sides of the outer body of 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 ninth aspects, wherein the exterior body in at least one of the front body and the back body spans at least a width direction range corresponding to the portion between the side seal portions in the front-rear direction. Is provided so that the expansion / contraction direction of the expansion / contraction region is the width direction,
A pants-type disposable wearing article characterized by that.

(Function and effect)
The above-described stretchable structure is suitable for an exterior body of a pants-type disposable wearing article.

  ADVANTAGE OF THE INVENTION According to this invention, in the expansion-contraction structure of the absorbent article using a perforated nonwoven fabric, advantages, such as being able to prevent the deterioration of the external appearance of a wrinkle, are employ | adopted, employing a striped adhesive pattern.

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

  Hereinafter, an example of a pants-type disposable diaper will be described in detail with reference to the accompanying drawings. The dotted pattern portion in the cross-sectional view shows an adhesive as a joining means for joining the constituent members located on the front side and the back side. Hot melt adhesives can be applied by known methods such as slot coating, continuous line or dotted line bead coating, spiral coating, Z coating, etc., or pattern coating (transfer of hot melt adhesive in relief printing). Can be applied. Instead of or together with this, at the fixing portion of the elastic member, the 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 hot melt adhesives include EVA, adhesive rubber (elastomer), olefin, and polyester / polyamide types, which 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 exterior body 12F that constitutes the front body F, a rear exterior body 12B that constitutes the rear body B, and a rear exterior body from the front exterior body 12F through the crotch portion. An interior body 200 provided inside the exterior bodies 12F and 12B so as to extend to the body 12B. Both side portions of the front exterior body 12F and both side portions of the rear exterior body 12B are joined to form a side seal portion 12A. As a result, the openings formed by the front and rear end portions of the exterior bodies 12F and 12B become the waist openings WO through which the wearer's torso passes, and the lower edges of the exterior bodies 12F and 12B and the interior body 200 on both sides in the width direction of the interior body 200. The portions surrounded by the side edges are leg openings LO through which the legs pass. The interior body 200 is a portion that absorbs and holds excrement such as urine, and the exterior bodies 12F and 12B are portions that support the interior body 200 with respect to the wearer's body. The symbol Y in the figure indicates the total length of the diaper in the unfolded state (the length in the front-rear direction from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the back body B), and the symbol X in the unfolded state. The full width of the diaper is shown.

  The pants-type disposable diaper includes a waist region T defined as a front-rear direction range (a front-rear direction range extending from the waist opening WO to the upper end of the leg opening LO) having the side seal portion 12A, and a portion that forms the leg opening LO. An intermediate region L defined as a front-rear direction range (between a front-rear direction region having the side seal portion 12A of the front body F and a front-rear direction region having the side seal portion 12A of the rear body B). The waistline region T can be divided into a “waist portion” W that conceptually forms the edge of the waist opening and a “waist lower portion” U that is a lower portion than this. Usually, in the case where the waist region WO has a boundary where the stretching stress in the width direction WD changes (for example, the thickness of the elastic member or the elongation rate changes), the waist opening WO side is more waist-like than the waist opening WO side boundary. When there is no such boundary, the waist opening WO side becomes the waist portion W with respect to the absorbent body 56 or the interior body 200. These lengths in the front-rear direction vary depending on the size of the product and can be determined as appropriate. For example, the waist portion W may be 15 to 40 mm, and the waist lower portion U may be 65 to 120 mm. On the other hand, both side edges of the intermediate region L are wrapped in a U-shape or a curved shape along the circumference of the leg of the wearer, and this is a portion into which the wearer's leg is put. As a result, the unfolded pants-type disposable diaper has a substantially hourglass shape as a whole.

(Inner / outer joint)
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 body 12F, 12B is applied to the back surface of the interior body 200, that is, the back surface of the liquid-impermeable sheet 11 in this case and the hot melt adhesive applied to the root portion 65 of the rising gather 60. Is fixed. The inner / outer joint part 201 that fixes the inner body 200 and the outer bodies 12F and 12B can be provided in almost the entire region where both overlap, for example, the inner body 200 may be provided in a portion excluding both ends in the width direction. 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 interior body 200 includes a top sheet 30 on the body side, a liquid-impermeable sheet 11, and an absorbent element 50 interposed therebetween. Yes, it is the main body that takes up the absorption function. Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent element 50. Shows a rising gather 60 that extends from both sides of the interior body 200 so as to contact the legs of the wearer in order to prevent excrement from leaking to both sides of the interior body 200.

(Top sheet)
The top sheet 30 has a property of allowing liquid to pass through, and examples thereof include a porous or non-porous nonwoven fabric, a porous plastic sheet, and the like. Of these, the nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. For example, if flexibility and drapeability are required, the spunbond method and spunlace method are preferable. If bulkiness and softness are required, the air-through method, point bond method, and thermal bond method are preferable processing methods. .

  The top sheet 30 may be composed of a single sheet or a laminated sheet obtained by bonding 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 side portions of the top sheet 30 may be folded back to the back side at the side edge of the absorbent element 50, or may be projected to the side from the side edge of the absorbent element 50 without being folded back.

  The top sheet 30 may be fixed to a member adjacent to the back side by a joining means by material welding such as heat sealing or ultrasonic sealing, or a hot melt adhesive for the purpose of preventing positional deviation 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 packaging sheet 58 located on the front side of the absorber 56 by a hot melt adhesive applied to the back surface thereof.

(Intermediate sheet)
An intermediate sheet (also referred to as “second sheet”) 40 having a higher liquid permeation rate than the top sheet 30 can be provided in order to quickly transfer the liquid that has permeated through the top sheet 30 to the absorber. This intermediate sheet 40 not only improves the absorption performance by the absorbent by quickly transferring the liquid to the absorbent body, but also prevents the “reversed” phenomenon of the absorbed liquid from the absorbent body, so that the top sheet 30 is always dried. It can be in a state of being. 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, spunbond nonwoven fabric, SMS nonwoven fabric, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond nonwoven fabric, or crepe paper. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber 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 fiber of the nonwoven fabric is preferably 2.0 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use an eccentric fiber, a hollow fiber, or an eccentric and hollow fiber that does not have a core at the center as the mixed fiber of all or part of the raw fiber.

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

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

(Liquid impervious sheet)
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 provided with a plastic film on the surface of the nonwoven fabric, or a plastic film For example, a laminated sheet in which a nonwoven fabric or the like is laminated and bonded to each other can be exemplified. The liquid-impermeable sheet 11 is preferably made of a liquid-impermeable and moisture-permeable material that 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 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 fabric using microdenier fibers, leakproof reinforcement by reducing the voids of the fibers by applying heat or pressure, and methods such as coating with a superabsorbent resin or hydrophobic resin or water repellent Thus, a sheet that is liquid-impermeable without using a plastic film can also be used as the liquid-impermeable sheet 11.

  The liquid-impermeable sheet 11 has a width that can be accommodated on the back side of the absorbent element 50 as shown in the drawing, and in order to improve leakage prevention, the liquid-impermeable sheet 11 wraps around both sides of the absorbent element 50 to form the side surface of the top sheet 30 of the absorbent element 50. It can also extend to both sides. The width of this extended portion is suitably about 5 to 20 mm on each of the left and right sides.

(Get up gather)
The rising gather 60 is for preventing side leakage, extends across the entire front-rear direction LD along both side portions of the interior body 200, and stands up from the side of the interior body 200 to the front side. The rising gather 60 in the illustrated example is such that the base side portion rises obliquely toward the center in the width direction, and the tip side portion rises obliquely outward in the width direction from the intermediate portion, but is not limited thereto. However, it is possible to make appropriate changes such as a configuration in which the whole stands up in the center in the width direction.

  More specifically, the rising gather 60 in the illustrated example folds the belt-shaped gathered nonwoven fabric 62 having a length equal to the length in the front-rear direction of the interior body 200 in the width direction WD at the tip portion and folded in two. In addition to overlapping, a plurality of elongated gather elastic members 63 are fixed along the longitudinal direction and spaced apart in the width direction WD between the folded portion and the sheet in the vicinity thereof. The base end portion (the end portion on the side opposite to the sheet folding portion in the width direction WD) of the rising gather 60 opposite to the front end portion is fixed to the side portion on the back side of the liquid-impermeable sheet 11 in the interior body 200. A portion 65 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. The main body portion 66 includes a root side portion extending toward the center in the width direction and a tip side portion that is folded back at the tip of the root side portion and extends outward in the width direction. This form is a surface contact type rising gather 60, but a line contact type rising gather 60 that is not folded outward in the width direction can also be used. And while the both ends of the front-back direction among the main body parts 66 are set to the fall-down part 67 fixed with respect to the side part surface of the top sheet 30 in a lying state, the front-back direction intermediate part located between these is not fixed. The gather elastic member 63 along the front-rear direction LD is fixed in an extended state to at least the tip of the free portion 68.

  In the rising gather 60 configured as described above, the contraction force of the gather elastic member 63 acts so as to bring the both ends in the front-rear direction closer, but the both ends of the main body portion 66 are fixed so as not to stand up. On the other hand, since there is a non-fixed free portion 68 between them, only the free portion 68 stands up so as to abut on the body side as indicated by an arrow in FIG. In particular, when the root portion 65 is positioned on the back side of the interior body 200, the free portion 68 stands up so as to open outward in the width direction at and around the crotch portion, so that the rising gather 60 abuts on the surface around the legs. As a result, the fit is improved.

(Absorption element)
Although the absorption element 50 is not specifically limited, In this example, it has the absorber 56 and the packaging sheet 58 which wraps this absorber 56 whole. The packaging sheet 58 can be omitted.

(Absorber)
The absorber 56 can be formed of an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used. It is preferable to disperse and hold superabsorbent polymer particles in the absorber 56.

  The absorber 56 may be rectangular, but as shown in FIG. 7, the absorber 56 includes a front end portion, a rear end portion, and a constricted portion 56 </ b> N that is located between these and narrower than the front end portion and the rear end portion. The hourglass shape is preferred because the fit of the absorber 56 and the rising gather 60 around the legs is improved.

  Further, the size of the absorbent body 56 can be appropriately determined as long as it extends to the front, rear, left, and right of the urination port position, but preferably extends to the peripheral portion of the interior body 200 or the vicinity thereof in the front-rear direction LD and the width direction WD. . 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 all thereof. 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 suitable. High-absorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and sodium carboxymethylcellulose crosslinks. Or an acrylic acid (salt) polymer can be used. As the shape of the superabsorbent polymer particles, a commonly used granular material is suitable, but other shapes can also be used.

  As the superabsorbent polymer particles, those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less are preferably used. If the water absorption speed is too slow, the liquid supplied into the absorber 56 is likely to cause a so-called reverse return that returns to the outside of the absorber 56.

  Further, as the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. Thereby, even if it is a case where it is set as the bulky absorber 56, the sticky feeling after liquid absorption can be suppressed effectively.

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

(Packaging sheet)
When the packaging sheet 58 is used, as the material, tissue paper, particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet with small holes, or the like can be used. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used in place of the crepe paper, a hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material can be polypropylene, polyethylene / polypropylene composite material, or the like. The basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .

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

(Exterior body)
The exterior bodies 12F and 12B include a front exterior body 12F that is a part constituting the front body F and a rear exterior body 12B that is a part constituting the rear body B. The front exterior body 12F and the rear exterior body 12B Are not continuous on the crotch side and are spaced apart in the front-rear direction LD (exterior two-split type). This separation distance 12d can be, for example, about 40 to 60% of the total length Y. Moreover, as shown in FIG.8 and FIG.9, the exterior body 12 can also be made into the integral thing which continues between crotches from the front body F to the back body B (exterior integral type).

  In the exterior two-divided type pants-type disposable diaper, since the interior body 200 is exposed between the front exterior body 12F and the rear exterior body 12B, the liquid-impermeable sheet 11 is not exposed on the back surface of the interior body 200. The cover nonwoven fabric 20 covering the back surface of the interior body 200 is preferably provided between the front exterior body 12F and the interior body 200 and between the rear exterior body 12B and the interior body 200. The material of the cover nonwoven fabric 20 is not particularly limited. For example, the same material as the outer nonwoven fabric layer 12S or the inner nonwoven fabric layer 12H of the outer package 12 (a porous nonwoven fabric layer or a nonporous nonwoven fabric layer described later) may be used. . The front-rear direction range of the cover nonwoven fabric 20 is not particularly limited as long as it has portions 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 rear end of the interior body 200. As shown in FIG. 7, the intermediate position in the front-rear direction of the region where the rear exterior body 12B and the interior body 200 overlap from the front-rear direction intermediate position of the region where the front exterior body 12F and the interior body 200 overlap. It may extend in the front-rear direction LD.

  The exterior bodies 12 </ b> F and 12 </ b> B have a waistline portion that is a front-rear direction range corresponding to the waistline region T. In this embodiment, the front exterior body 12F does not have a portion corresponding to the intermediate region L, but the rear exterior body 12B has a collar cover portion C that extends from the waist region T to the intermediate region L side. is doing. Although not shown, the front exterior body 12F is also provided with a collar cover portion that extends from the waistline region T toward the intermediate region L, a configuration that does not provide a collar cover portion while providing a groin cover portion, and the front exterior body 12F and It is not necessary to provide a portion corresponding to the intermediate region L in both of the rear exterior bodies 12B. Further, in the illustrated example, the lower edge of the collar cover portion C is formed in a straight line shape along the width direction WD, similarly to the lower edge of the front exterior body 12F. It can also be a curve that becomes.

  The exterior bodies 12F and 12B have the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H, as FIG. 2-5 shows. 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. As shown in FIG. 5, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are formed by folding one sheet material so that the crease is located on the waist opening side, and as shown in FIG. These sheet materials can also be bonded together. Further, the innermost portion 12r of these sheet materials can be extended to the end of the interior body 200 on the waist opening WO side (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 formed of a sheet material that is partially different from the other portions.

  As constituent fibers of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H, for example, synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides (including single-component fibers and composite fibers such as core sheaths) In addition, regenerated fibers such as rayon and cupra, natural fibers such as cotton, and the like can be selected without particular limitation, and these can also be used as a mixture. 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, the constituent fibers of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H may be hydrophilic fibers (including hydrophobic fibers made hydrophilic by a hydrophilizing agent) or hydrophobic fibers or water repellent fibers (water repellent fibers). (Including water-repellent fibers made water-repellent by an agent). Nonwoven fabrics are generally short fiber nonwoven fabrics, long fiber nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, thermal bond (air-through) nonwoven fabrics, needle punches, depending on fiber length, sheet formation method, fiber bonding method, and laminated structure. These are classified into non-woven fabrics, point-bonded non-woven fabrics, laminated non-woven fabrics (SMS non-woven fabrics with a melt-blown layer sandwiched between spunbond layers, SMMS non-woven fabrics, etc.). Can do.

Although the fineness and the basis weight of the constituent fibers of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H can be determined as appropriate, they are preferably about 1.8 to 6.0 dtex and about 10 to 30 g / m ² , respectively.

(About perforated nonwoven fabric)
As shown in FIGS. 2, 8, 11, and 12, at least one of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H is a perforated nonwoven fabric in which holes 14 penetrating in the thickness direction are scattered. As shown in FIGS. 11 and 12, when the inner nonwoven fabric layer 12H on the skin side of the wearer is a non-porous nonwoven fabric and the outer nonwoven fabric layer 12S is a porous nonwoven fabric, the influence on the touch of the holes 14 is eliminated. Can do. Moreover, since the hole 14 is provided in only one of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H, 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 FIG.13 and FIG.14, both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are perforated nonwoven fabrics, and the hole 14 of one perforated nonwoven fabric and the hole 14 of the other perforated nonwoven fabric do not overlap. A structure is also preferable. In this case, higher air permeability can be obtained by making both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H porous. Moreover, since the hole 14 of one perforated nonwoven fabric and the hole 14 of the other perforated nonwoven fabric do not overlap, 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. May overlap. In addition, although not shown, when both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are perforated nonwoven fabrics, in most cases (for example, an area of 50% or more), the holes 14 of one perforated nonwoven fabric and the other perforated nonwoven fabric are formed. Although the hole 14 of the porous nonwoven fabric does not overlap, in some cases, the hole 14 of one porous nonwoven fabric and the hole 14 of the other porous nonwoven fabric may overlap.

  The planar shape (opening shape) of each hole 14 can be determined as appropriate. The hole 14 has a long hole shape as shown in FIG. 10 (b), a perfect circle as shown in FIG. 10 (e), an ellipse, a triangle, and a rectangle as shown in FIGS. 10 (a) and 10 (d). , Polygons such as rhombuses, stars, clouds, etc. As shown in FIG. 10 (c), holes having different shapes may be mixed, but in that case, it is preferable that the dimensions in the expansion / contraction direction are substantially the same, and that all the holes have a single shape. preferable. The dimension of each hole 14 is not particularly limited, but the dimension 14L in the orthogonal direction XD (the dimension of the longest part) is preferably 0.3 to 3.0 mm, particularly preferably 0.4 to 1.5 mm, and the stretching direction The ED dimension (longest dimension) 14W 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 long shape in one direction such as a long hole shape, an ellipse shape, a rectangular shape, a rhombus shape, etc. (a shape in which the total length in one direction is longer than the total length in the direction perpendicular thereto), the dimension in the longitudinal direction It is preferable that (the dimension of the longest part) is 1.2 to 2.5 times the dimension (the dimension of the longest part) in the direction orthogonal thereto. Moreover, when the shape of the hole 14 is long in one direction, the longitudinal direction of the hole 14 is preferably the front-rear direction LD, but may be the width direction WD or an oblique direction.

Although individual area and the area ratio of the holes 14 may be appropriately determined, it is preferable that the area is 0.1~2.7mm ² (especially 0.1 to 1.0 mm ²⁾ about, the area ratio 1. It is preferably about 0 to 15.0% (particularly 5.0 to 10.0%).

  The planar arrangement of the holes 14 can be determined as appropriate as long as the rows of the holes 14 arranged at intervals in the direction orthogonal to the expansion / contraction direction ED are arranged at intervals in the expansion / contraction direction ED. For example, as shown in FIGS. 10A, 10C, and 10D, the holes 14 are arranged in such a manner that the rows of holes 14 linearly arranged at a predetermined interval in the orthogonal direction XD have a predetermined interval in the expansion / contraction direction ED. It is preferable that the matrix is repeated. In this case, as shown in FIG. 10 (a), the interval 14x in the expansion / contraction direction ED is shorter than the interval 14y in the orthogonal direction XD, and as shown in FIG. 10 (c), the interval 14x in the expansion / contraction direction ED. And an interval 14y between the orthogonal direction XD and the interval 14x in the expansion / contraction direction ED may be longer than the interval 14y in the orthogonal direction XD, as shown in FIG. Further, as shown in FIGS. 10B and 10E, the rows of the holes 14 linearly arranged at a predetermined interval in the orthogonal direction XD are spaced from each other in the expansion / contraction direction ED so that the positions in the orthogonal direction XD are shifted. It can be arranged in a line. The example shown in FIG. 10B is a so-called zigzag (hexagonal lattice) arrangement in which the holes 14 are alternately arranged in the row of adjacent holes 14.

  The orthogonal direction interval 14y and the expansion / contraction direction interval 14x of the holes 14 may be constant or may vary. Although the orthogonal direction interval 14y and the expansion / contraction direction interval 14x of the holes 14 can be determined as appropriate, in consideration of air permeability, 14y is 2.5 to 10.0 mm, 14x is 1.0 to 5.0 mm, and particularly 14y is It is desirable that 3.0 to 5.0 mm and 14x are 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. 16 (a) to 16 (c), the hole 14 is a punching type hole whose periphery is formed by a cut end of the fiber as shown in FIG. 16 (d). 14 may be a non-punched hole 14 (the edge has a high fiber density) formed by having almost no cut ends of the fiber at the periphery of 14 and a pin inserted between the fibers and spread. As shown in FIG. 16D, the punching type hole may be smaller as the diameter of the hole 14 goes to the middle in the thickness direction, or smaller as it goes to the one side in the thickness direction. . In addition, 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 expansion / contraction direction (therefore, the diameter is a circle for a circle and the ellipse is a major axis). 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 over the entire thickness direction of the nonwoven fabric layer, and that the decrease in the diameter of the hole 14 almost disappears in the middle of the thickness direction. Is also included.

  The non-punched hole 14 is such that the diameter of the hole 14 decreases from the pin insertion side toward the opposite side. In such a non-punched hole, as shown in FIGS. 16 (a) and 16 (c), a fiber is pushed out to the edge of the hole 14 on the side opposite to the pin insertion side and pushed out to the side opposite to the pin insertion side. The part (burr) 14e is formed, and the protrusion 14e is not formed on the pin insertion side, and the fiber is inserted into the edge of the hole 14 on the side opposite to the pin insertion side as shown in FIG. The protrusion 14e pushed out to the opposite side is formed, and the pin insertion side includes the protrusion 14e formed by pushing out the fiber to the pin insertion side. Further, in the former type of hole 14, the protrusion 14 e has a substantially uniform height 14 h as shown in FIG. 16A, and the protrusion 14 e as shown in FIG. This includes a facing portion having the highest protruding height 14i and a facing portion facing in a direction perpendicular to the protruding portion and having the lowest protruding height 14j. Although it is desirable that the protruding portion 14e has a cylindrical shape continuously in the circumferential direction of the hole, the protruding portion 14e of a part or all of the holes 14 is formed only in a part of the circumferential direction of the hole 14. Also good. The protruding heights 14h, 14i, and 14j (apparent height in a state where no pressure is measured using an optical microscope) is preferably about 0.2 to 1.2 mm. The highest protrusion height 14i in the protrusion 14e is preferably about 1.1 to 1.4 times the lowest protrusion height 14j. The protruding height of the protruding portion 14 e may change in the circumferential direction of the hole 14.

  For example, when a hole 14 having a long shape in one direction as shown in FIGS. 10A, 10B, and 10D is formed by inserting a pin, fibers at the edge of the hole 14 are retracted 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 fiber density that is lower than that of the surrounding portion, but is preferably the same or higher.

The fineness, basis weight and thickness of the constituent fibers of the perforated nonwoven fabric can be determined as appropriate, but in the normal 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. Further, the MD softness of the perforated nonwoven fabric (width direction) is preferably 35 to 100 mm, particularly 40 to 70 mm in a non-porous state before perforation, and 10 to 50 mm in a state after perforation. In particular, the thickness is preferably 15 to 40 mm.

(Elastic area)
In 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 expansion / contraction region A2 is formed that elastically expands and contracts in the width direction WD as the elastic member 19 expands and contracts. ing. That is, in the stretchable region A2, in the natural length state, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are contracted with the contraction of the elastic member and have a large number of wrinkles 80. Further, when the stretchable region A2 is extended in the width direction WD, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are extended to a predetermined extension rate that can be extended without wrinkles 80. The elastic member 19 can be used in any shape, e.g., a thread shape, a string shape, and a belt shape, as long as it is elongated. The elastic member 19 may be made of synthetic rubber or natural rubber.

  The elastic member 19 is fixed to the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H at least at both ends in the stretching direction ED in the stretchable region A2. The fixing means for the elastic member 19 is not particularly limited, but it is preferable to use the hot melt adhesive 19H. For example, as shown in FIGS. 11 and 12, after the hot melt adhesive 19H is intermittently applied to the outer peripheral surfaces of both ends of the elastic member 19 in the expansion / contraction direction ED by an application means such as a comb gun or a sure 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 in the stretching direction ED in the stretchable region. As shown in FIGS. 13 and 14, after the hot melt adhesive 19H is applied to the arrangement positions of both ends of the elastic member 19 in the expansion / contraction 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 also be sandwiched 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 illustrated, or may be intermittently disposed 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.

In the case of a pants-type disposable diaper such as the illustrated example, it is desirable to provide the elastic member 19, that is, the stretchable region at the following site. That is, a plurality of waist elastic members 17 are spaced in the front-rear direction so as to be continuous over the entire width direction WD between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H in the waist portion W of the exterior bodies 12F and 12B. Attached. Moreover, about the 1 or several arrange | positioned by the area | region adjacent to the waist lower part U among the waist part elastic members 17, you may overlap with the interior body 200 or the width direction center which overlaps with the interior body 200 You may provide each in the width direction both sides except a part. The waist elastic member 17 has a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to 1. the rubber thread 0mm approximately ²⁾ is preferably provided about 3 to 22 present at intervals of 4 to 12 mm, which by extension ratio in the width direction WD of the waist portion W is 150% to 400%, especially at about 220 to 320 percent Preferably there is. Further, the waist portion W does not need to use the same thickness waist portion elastic member 17 in all of the front-rear direction LD or have the same elongation rate. The thickness and elongation rate may be different.

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

The waist lower part 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 , particularly 0.1 to 1. the rubber thread 0mm about ^2), 1 to 15 mm, particularly preferably to dispose 5-30 present at intervals of 3 to 8 mm, this elongation in the width direction WD of the waist lower portion U by 200 to 350%, in particular It is preferably about 240 to 300%.

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

The cover elastic member 16 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to 1.0 mm. ^It is preferable that about 2 to 10 thread rubbers are provided at intervals of 5 to 40 mm, particularly 5 to 20 mm, and the elongation ratio of the cover portion in the width direction WD is 150 to 300%, particularly 180 to 260. % Is preferred.

  In the case of providing a groin cover portion on the front exterior body 12F, a cover portion 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 buttock 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. In order to prevent shrinkage, the intermediate in the width direction (preferably including the entire inner / outer joint portion 201) including part or all of the portion overlapping the absorber 56 and the width direction WD is defined as the non-stretchable region A1, and the width direction Both sides are taken as the stretchable area A2. The waist portion W is preferably the stretchable region A2 over the entire width direction WD, but similarly to the waist lower portion U, a non-stretchable region A1 may be provided in 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 the elastic members 15 and 16 are at least both ends in the stretchable direction ED in the stretchable region A2. In the region that becomes the non-stretchable region A1, the elastic members 15 and 16 are pressed and applied at one place in the middle of the width direction in the region that becomes the non-stretchable region A1. It can be constructed by cutting by heating, or by cutting almost the entire elastic members 15 and 16 finely by pressurization and heating, leaving the stretchability in the stretchable region A2 and killing the stretchability in the non-stretchable region A1. . In the former case, as shown in FIG. 4, the non-stretchable region A1 has an outer nonwoven fabric in a state in which the uncut stretched region A2 is continuously cut from the elastic members 15 and 16 of the stretchable region A2 to the natural length alone as the unnecessary elastic member 18. In the latter case, it remains between the layer 12S and the inner nonwoven fabric layer 12H. Although not shown in the drawing, the cut residue continuous from the elastic members 15 and 16 in the elastic region A2 and the elastic members 15 and 16 in both elastic regions A2 are continuous. The cut piece of the elastic member that is not left is left between the outer nonwoven fabric layer 12 </ b> S and the inner nonwoven fabric layer 12 </ b> H in a state where the cut piece of the elastic member is contracted to the natural length alone as an unnecessary elastic member.

(Junction structure of outer nonwoven fabric layer and inner nonwoven fabric layer)
As shown in FIGS. 11 and 12, the stretchable region A2 has a sheet joining portion 70 in which the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are joined via a hot melt adhesive 14H. The agent 14H is applied in a striped pattern that is spaced in the expansion / contraction direction ED and continuous in the orthogonal direction XD. Thus, since the sheet | seat junction part 70 by the hot-melt-adhesive 14H is formed at intervals in the expansion-contraction direction ED, air permeability and a softness | flexibility can be ensured. In addition, when the sheet bonding portion 70 is formed by applying a hot melt adhesive 14H with a striped pattern continuous in the orthogonal direction XD with an interval in the expansion / contraction direction ED, including the natural length state, In a state where the sheet is contracted to some extent, as shown in FIG. 17, the sheet bonding portion 70 becomes a groove continuous in a direction perpendicular to the expansion / contraction direction ED, and the outer nonwoven fabric layer 12 </ b> S and the inner nonwoven fabric layer 12 </ b> H are formed at the non-bonded portion between the grooves. A wrinkle is formed by bulging to the same extent in opposite directions (on both sides). The hot melt adhesive 14 </ b> H may be continuous over the entire orthogonal direction XD of the stretchable region A <b> 2, but may be continuous only in a part of the range intersecting with the plurality of elastic members 19.

  On the other hand, when the present stretchable structure is manufactured using a ready-made perforated nonwoven fabric, the outer nonwoven fabric is formed in a portion to be a sheet joint portion by overlapping a part of the coating line of the hot melt adhesive 14H and the row of the holes 14. There is a possibility that a missing portion where the layer 12S and the inner nonwoven fabric layer 12H are not joined is formed. Here, when the interval 14y in the orthogonal direction XD of the holes 14 in the row of the holes 14 is smaller than the dimension 14L in the orthogonal direction XD of the holes 14, the sheet joining portion 70 becomes a dotted line shape that is intermittent through a long missing portion, A large number of long concave missing portions are formed at the edge of the sheet joining portion 70. When the omission of the sheet joining portion 70 is increased in this manner, the side edges of the ridge 80 are also greatly uneven or partially merged with the adjacent ridge 80, so that it is difficult to obtain a straight and uniform appearance. .

  On the other hand, if the interval 14y in the orthogonal direction XD of the holes 14 in the row of holes 14 is larger than the dimension 14L in the orthogonal direction XD of the holes 14 as shown in the example of the drawing, a part of the sheet joining portion 70 has a missing portion. Even if it is formed, since the ratio of the missing portion in the orthogonal direction XD of the sheet joining portion 70 is less than half, the influence of the missing portion on the shape of the flange 80 can be smaller. Therefore, as shown in FIG. 17, even if irregularities are formed on the side edge of the ridge 80 or partially merged with the adjacent ridge 80, the extent can be suppressed.

  The interval 14y in the orthogonal direction XD of the holes 14 in the row of the holes 14 can be determined as long as it is wider than the dimension 14L of the holes 14 in the orthogonal direction XD, but is at least three times the dimension 14L of the holes 14 in the orthogonal direction XD. And even if unevenness is formed on the side edge of the collar 80 due to the missing part (the part overlapping the hole 14) of the sheet joining part 70, or it is partially combined with the adjacent collar 80, it is almost inconspicuous Become. Further, when the interval 14y in the orthogonal direction XD of the holes 14 in the row of holes 14 exceeds 20 times the dimension 14L of the orthogonal direction XD of the holes 14, the number of the holes 14 per unit area decreases, and a perforated nonwoven fabric is used. The profit to do is poor. A more preferable range is 3 to 10 times.

  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 not less than the interval 19y in the orthogonal direction XD of the elastic member 19. As a result, since there is only one or less holes 14 in each row in the entire area between the adjacent elastic members 19, the change in the ease of bending due to the presence or absence of the holes 14 is small, and the ridges are further improved. 80 is easily formed.

  Further, in the illustrated example, all the expansion / contraction areas A2 satisfy the size relationship of the interval 14y and the dimension 14L, but it is not necessary for all of the expansion / contraction areas A2 to satisfy the size relationship of the interval 14y and the dimension 14L. For example, although not shown, the waist portion W does not satisfy the size relationship of the interval 14y and the size 14L, but may satisfy the size relationship of the interval 14y and the size 14L except for the waist portion W. The relationship between the intervals 14y and 19y is the same, and may be filled with all of the stretchable region A2, or may not be filled with a part of the stretchable region A2.

  The interval 14x in the expansion / contraction direction ED of the row of holes 14 can be determined as appropriate. However, if the interval 14x is less than the interval 70y in the expansion / contraction direction ED of the sheet joining portion 70, one or more holes are provided in each flange 80 as illustrated. 14 exists, and the air permeability between the space between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H and the outside of each ridge 80 is preferable. In addition, if the interval in the expansion / contraction direction ED of the row of holes 14 is reduced in this way, the probability that the application line of the hot melt adhesive 14H overlaps with the row of holes 14 increases, but even in that case, as described above In addition, since 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 in the orthogonal direction XD of the holes 14, the shape of the flange 80 can be prevented from being deformed.

  As described above, the cross-sectional structure of the hole 14 is not particularly limited, but when the protruding portion 14e is formed at the edge of the hole 14 on the opposite nonwoven fabric layer side, the hot melt adhesive 14H is applied. When the line and the hole 14 overlap each other, the portion including the protruding portion 14e at the edge of the hole 14 is adhered by the hot melt adhesive 14H, so that the bite of the hot melt adhesive 14H becomes good, and the protruding portion 14e. Adhesive strength is higher than in the case of not having. Further, since the perforated nonwoven fabric is separated from the opposing nonwoven fabric by the amount of the protrusion 14e, the hot melt adhesive 14H exposed from the hole 14 when the surface opposite to the opposing nonwoven fabric is touched by hand is in hand. It also has the advantage of being difficult to touch.

  In particular, when both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are perforated nonwoven fabrics, and there is a possibility that the holes 14 and 14 overlap, the hot melt adhesive 14H is applied to the portion where the holes 14 and 14 overlap. When the coating lines overlap, the hot melt adhesive 14H protrudes into the holes 14 and may cause problems such as wearing feeling. Therefore, as shown in FIGS. 11 and 12, the inner nonwoven fabric layer 12H on the skin side of the wearer is a nonporous nonwoven fabric, and the outer nonwoven fabric layer 12S is a porous nonwoven fabric, as shown in FIGS. Thus, it is desirable that 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.

  As described above, the arrangement of the holes 14 is not limited. However, since the perforated nonwoven fabric is easily bent at the portion having the holes 14, the shape of the ridge 80 is affected. Therefore, when the holes 14 are arranged in a matrix in which rows of holes 14 linearly arranged at a predetermined interval in the orthogonal direction XD are repeated at a predetermined interval in the expansion / contraction direction ED, in particular, the ridge 80 is arranged in the orthogonal direction XD. It is preferable because it extends straight along and tends to be neatly arranged.

Moreover, although the dimension and arrangement | positioning of the concrete hole 14 and the sheet | seat junction part 70 can be determined suitably, it is especially preferable in it being in the following ranges. That is, when the sheet bonding portion 70 has a missing portion, the bonded portion is more easily peeled off than the area of the sheet bonding portion 70 is simply reduced due to the tendency of stress concentration. And when peeling of such an adhesive part generate | occur | produces, there exists a possibility that the deterioration of the external appearance of the collar 80 may become still more remarkable by collapse of a part or whole of the collar 80. On the other hand, when the arrangement of the hole 14 and the sheet bonding portion 70 is within this range, even if the sheet bonding portion 70 has a missing portion, it is difficult to peel off.
Dimension 14W of expansion / contraction direction ED of hole 14: 0.3-5.0 mm (especially 1.0-2.0 mm)
Dimension 14L in the orthogonal direction XD of the hole 14: 0.3 to 3.0 mm (particularly 1.0 to 1.5 mm)
Interval 14y in the orthogonal direction XD of the holes 14 in the row: 2.5 to 10.0 mm (especially 3.0 to 5.0 mm)
Interval 14x between rows in the expansion / contraction direction ED: 1.0 to 5.0 mm (particularly 1.0 to 2.0 mm)
Dimensions of sheet joint in the stretching direction: 0.5-4 mm (especially 1.0-2.0 mm)
Spacing between sheet joints in the stretching direction: 4 to 8 mm (especially 6 to 8 mm)

  Although the hole 14 and the sheet | seat junction part 70 can also be provided only in the expansion-contraction area | region A2, as shown in the example shown in FIG.8 and FIG.9, it can be provided over a wider range area | region including the non-expandable area | region A1.

  The sheet joining portion 70 of the above example is a portion where the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are joined via the hot melt adhesive 14H, but is a portion where the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are welded. There may be. That is, at the time of forming the sheet joining portion 70, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H may be welded in a striped pattern that is spaced in the expansion / contraction direction ED and continuous in the orthogonal direction XD. In this case, the elastic member 19, the outer nonwoven fabric layer 12S, and the inner nonwoven fabric layer 12H may be welded or not welded at the passing position of the elastic member 19. In any case, in order to weld the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H with the elastic member 19 interposed, the melted portions of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer. At least one of 12H is continuous in the orthogonal direction XD.

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

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

  -"MD direction" and "CD direction" mean the flow direction (MD direction) in production equipment and the transverse direction (CD direction) perpendicular thereto, and either one is the front-rear direction, and the other Is the width direction. The MD direction of the nonwoven fabric is the direction of fiber orientation of the nonwoven fabric. The fiber orientation is the direction along which the fibers of the nonwoven fabric are aligned. For example, the fiber orientation can be determined from the measurement method according to the TAPPI standard method T481, the fiber orientation test method using the zero-range tensile strength, and the tensile strength ratio in the front-rear direction and the width direction. It can be discriminated by a simple measuring method for determining the orientation direction.

  ・ "Front side" means the person near the wearer's skin when wearing a pants-type disposable diaper, and "Back" means the person far from the wearer's skin when wearing a pants-type disposable diaper .

  ・ "Surface" means the surface closer to the wearer's skin when wearing a pants-type disposable diaper, and "Back" refers to the skin of the wearer when wearing a pants-type disposable diaper. It 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, holes) in the target region (for example, non-woven fabric) by the area of the target region. is there. In a form 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 10 or more target portions and obtain the area ratio. For example, the area ratio of the pores can be measured by the following procedure using, for example, a trade name VHX-1000 of KEYENCE Corporation and measuring conditions 20 times.
(1) Set on a 20x lens and adjust the focus. The position of the nonwoven fabric is adjusted so that the holes are 4 × 6.
(2) Specify the brightness of the hole area and measure the area of the hole.
(3) Click the “Area measurement” color extraction in “Measurement / Comments”. Click on the hole.
(4) Click “Batch measurement”, check “Display measurement result window”, and save as CSV data.

  “Elongation rate” means a value when the natural length is 100%. For example, an expansion rate of 200% is synonymous with an expansion ratio of 2 times.

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

  ・ "Weight" is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 23 ± 1 ° C., relative humidity 50 ± 2%) to a constant weight. Pre-drying refers to making a sample or test piece constant in an environment at a temperature of 100 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%. From the test piece in a constant weight state, a sample plate (100 mm × 100 mm) is used to cut a sample having a size of 100 mm × 100 mm. The weight of the sample is measured, multiplied by 100, and the weight per square meter is calculated and used as the basis weight.

-"Thickness" is automatically measured using an automatic thickness measuring instrument (KES-G5 handy compression measurement program) under the conditions of load: 0.098 N / cm ² and pressure area: 2 cm ² .

  “Bending softness” means “8.21.1 A method (45 ° cantilever method)” of JIS L 1096: 2010 “Fabric and knitted fabric testing method”. When the non-porous nonwoven fabric before punching is not available, the value of the porous nonwoven fabric before punching (non-porous nonwoven fabric) is the same as the non-porous nonwoven fabric (fiber composition, fineness, basis weight, thickness, etc.). Prepare and measure.

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

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

  -"Developed state" means a state where the plate is flattened without contraction or slack.

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

  ・ If there is no description about the environmental conditions in the test and measurement, the test and measurement shall be performed in a test room or equipment in the standard state (test location: temperature 23 ± 1 ° C, relative humidity 50 ± 2%). To do.

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

  DESCRIPTION OF SYMBOLS 11 ... Liquid impervious sheet, 12 ... Exterior body, 12A ... Side seal part, 12B ... Rear side exterior body, 12F ... Front side exterior body, 12H ... Inner nonwoven fabric layer, 12S ... Outer nonwoven fabric layer, 14 ... Hole, 14e ... Projection, 18 ... unnecessary elastic member, 19 ... elastic member, 14H, 19H ... hot melt adhesive, 20 ... cover nonwoven, 200 ... interior body, 201 ... inner / outer joint, 30 ... top sheet, 40 ... intermediate sheet, 50 DESCRIPTION OF SYMBOLS ... Absorbing element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Gathering gather, 62 ... Gathered non-woven fabric, A1 ... Non-stretchable region, A2 ... Stretchable region, C ... Gutter cover part, L ... Middle region, LD ... Front-back direction , LO ... leg opening, T ... waist circumference region, U ... waist lower part, W ... waist part, WD ... width direction, WO ... waist opening, 70 ... sheet joint part, XD ... orthogonal direction, ED ... stretching direction 80 ... it folds.

Claims (10)

Along the stretch direction, the first nonwoven fabric layer and the second nonwoven fabric layer, which are partly or entirely overlapped, and arranged between the first nonwoven fabric layer and the second nonwoven fabric layer with an interval in the orthogonal direction perpendicular to the stretch direction. A plurality of elongated elastic members extending
The elastic member is fixed to the first nonwoven fabric layer and the second nonwoven fabric layer at least at both ends in the stretchable direction in the stretchable region,
The stretchable region has a sheet joining portion in which the first nonwoven fabric layer and the second nonwoven fabric layer are joined via a hot melt adhesive,
At least one of the first nonwoven fabric layer and the second nonwoven fabric layer is a perforated nonwoven fabric in which holes penetrating in the thickness direction are arranged.
In the elastic structure of disposable wearing articles,
The array of holes is an array of holes arranged at intervals in the orthogonal direction, and arranged at intervals in the expansion and contraction direction,
The hot melt adhesive is provided in a striped pattern that is spaced in the stretching direction and continuous in the orthogonal direction,
The orthogonal spacing of the holes in the array of holes is wider than the orthogonal dimension of the holes;
A stretchable structure for a disposable wearing article. The interval in the expansion / contraction direction of the row of holes is smaller than the interval in the expansion / contraction direction of the sheet joint portion,
The elastic structure of the disposable wearing article according to claim 1. The orthogonal spacing of the holes in the array of holes is 3 to 20 times the orthogonal dimension of the holes,
The elastic structure of the disposable wearing article according to claim 1 or 2. The perforated nonwoven fabric is one in which a protruding portion is formed at the edge of the hole on the opposite nonwoven fabric layer side.
The expansion-contraction structure of the disposable wearing article of any one of Claims 1-3. The hole has a dimension in the expansion / contraction direction of 0.3 to 5.0 mm, a dimension in the orthogonal direction of 0.3 to 3.0 mm,
The orthogonal spacing of the holes in the row is 2.5-10.0 mm;
The interval in the stretch direction of the row is 1.0 to 5.0 mm,
The dimension of the sheet joint in the stretch direction is 0.5-4 mm,
The interval between the sheet joints in the stretching direction is 4 to 8 mm.
The elastic | stretch structure of the disposable wearing article of any one of Claims 1-4. The hole array of the perforated nonwoven fabric is a matrix in which a row of holes linearly arranged at a predetermined interval in the orthogonal direction repeats at a predetermined interval in the expansion / contraction direction,
The elastic | stretch structure of the disposable wearing article of any one of Claims 1-5. Of the first nonwoven fabric layer and the second nonwoven fabric layer, the nonwoven fabric layer on the skin side of the wearer is a nonporous nonwoven fabric, and the opposite nonwoven fabric layer is the porous nonwoven fabric,
The elastic | stretch structure of the disposable wearing article of any one of Claims 1-6. Both the first nonwoven fabric layer and the second nonwoven fabric layer are the perforated nonwoven fabric, and the holes of one perforated nonwoven fabric do not overlap with the holes of the other perforated nonwoven fabric,
The elastic | stretch structure of the disposable wearing article of any one of Claims 1-7. Along the stretch direction, the first nonwoven fabric layer and the second nonwoven fabric layer, which are partly or entirely overlapped, and arranged between the first nonwoven fabric layer and the second nonwoven fabric layer with an interval in the orthogonal direction perpendicular to the stretch direction. A plurality of elongated elastic members extending
The elastic member is fixed to the first nonwoven fabric layer and the second nonwoven fabric layer at least at both ends in the stretchable direction in the stretchable region,
The stretchable region has a sheet joint portion to which the first nonwoven fabric layer and the second nonwoven fabric layer are welded,
At least one of the first nonwoven fabric layer and the second nonwoven fabric layer is a perforated nonwoven fabric in which holes penetrating in the thickness direction are arranged.
In the elastic structure of disposable wearing articles,
The array of holes is an array of holes arranged at intervals in the orthogonal direction, and arranged at intervals in the expansion and contraction direction,
The welding is performed in a striped pattern that is spaced in the stretch direction and continuous in the orthogonal direction;
The orthogonal spacing of the holes in the array of holes is wider than the orthogonal dimension of the holes;
A stretchable structure for a disposable wearing article. An integrated exterior body from the front body to the back body, or an exterior body provided separately for the front body and the back body, and an interior body that is attached to the middle part in the width direction of the exterior body and covers both the front and back of the crotch part A side seal part in which both sides of the outer body of the front body and both sides of the outer body of 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 back body covers the width direction range corresponding to between the said side seal parts in the partial range of the front-back direction at least, It is any one of Claims 1-9. Equipped with a stretchable structure so that the stretchable direction of the stretchable region is the width direction,
A pants-type disposable wearing article characterized by that.

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