JP2011177285A5 - - Google Patents

Description

Pants-type disposable diaper

  The present invention relates to a pants-type disposable diaper having an exterior sheet in which a leg opening portion has flexibility.

The pants-type disposable diaper includes an exterior sheet having a front body and a back body, and an interior body including an absorbent body fixed to the inner surface of the exterior sheet, and the front body and the back body of the exterior sheet are on both sides. Are joined together to form a waist opening and a pair of left and right leg openings.
In the pants-type disposable diaper, in order to improve the fit to the body, fixing various elastic members to the exterior sheet in an expanded state (see, for example, Patent Documents 1 to 6), A thing provided with a waist elastic member, a waist elastic member, and a leg elastic member (represented in Patent Document 6) has a relatively high fit to the body. Here, a plurality of waist elastic members are arranged in parallel along the width direction at intervals in the vertical direction at the edge of the waist opening. Further, the waist elastic member is disposed along the width direction with a space in the vertical direction in a region closer to the center in the front-rear direction than the waist elastic member. Furthermore, the leg-hole elastic member extends while curving from both sides of at least one of the front body and the back body toward the opposite body side toward the center in the width direction.

JP-A-7-265357 JP-A-7-299094 JP-A-11-36103 JP 2001-258931 A JP 2001-204762 A JP 2006-043415 A

However, if a large number of leg-hole elastic members are provided to improve the fit, the exterior sheet becomes hard due to an increase in the amount of adhesive applied to fix the elastic members, which deteriorates the wearing feeling. There was a point.
Then, the main subject of this invention is to make it rich in a softness | flexibility, ensuring sufficiently the fitting property in an exterior sheet | seat with an elastic member.

<Invention of Claim 1>
By including an exterior sheet having a front body and a back body, and an interior body including an absorbent body fixed to the inner surface of the exterior sheet, the front body and the back body of the exterior sheet are joined at both sides. In a pants-type disposable diaper in which a waist opening and a pair of left and right leg openings are formed,
At least one of the front body and the back body of the exterior sheet;
A plurality of elongated waist elastic members extending along the width direction are bonded to the edge of the waist opening at intervals in the vertical direction,
A plurality of elongate waist elastic members extending along the width direction are bonded to the region on the front-rear direction center portion side than the waist elastic member, with a space in the vertical direction,
A leg-hole elastic member that extends to the opposite body side from both sides toward the center in the width direction is bonded,
This leg-hole elastic member has a plurality of linear non-adhesive portions that are not adhered to the exterior sheet, sandwiched between a pair of adhesion portions adhered to the exterior sheet.
A pants-type disposable diaper characterized by that.

(Function and effect)
Since the leg-hole elastic member needs to be fixed in a curved or bent state on the exterior sheet, it is fixed on the exterior sheet by applying an adhesive to the elastic member, such as Nordson's Surerup nozzle. Not suitable for composition. Therefore, a method has been employed in which an adhesive is applied to the exterior sheet in a predetermined pattern such as a spiral, and the leg-hole elastic member is disposed thereon. As a result, there is a problem that the adhesive is applied to a portion unnecessary for adhesion of the elastic member, and the flexibility of the exterior sheet of the applied portion is impaired.
The present invention introduces a straight portion that does not bend or bend into the arrangement pattern of the leg-hole elastic member, and does not apply an adhesive for fixing the leg-hole elastic member to the non-adhesive free portion. The both sides are characterized in that they are bonded portions. With such a configuration, it is possible to remarkably reduce the amount of adhesive for fixing the leg-hole elastic member while securely fixing the leg-hole elastic member in a predetermined pattern. The flexibility of the exterior sheet is not impaired.
In the present invention, the “linear” elastic member indicates that the elastic member is linear in the unfolded state of the diaper, and does not need to be linear even when worn or packaged.

<Invention of Claim 2>
In at least a part of the plurality of non-bonded portions of the leg elastic member, at least one of the bonded portions on both sides is bonded to the exterior sheet with an adhesive applied in a pattern having a predetermined width continuous along the width direction. ing,
The pants-type disposable diaper according to claim 1.

(Function and effect)
When a straight non-adhesive part is provided on the leg elastic member, if the curved or bent tight part or the end of the leg elastic member is located on at least one side of the non-adhesive part, It is preferable to adhere and fix the leg elastic member with an adhesive applied in a predetermined width pattern along the width direction so as to keep the curved shape or prevent the end of the leg elastic member from being pulled in. . If the end of the leg-hole elastic member is not sufficiently fixed, the elastic member may be pulled into the center in the width direction.

<Invention of Claim 3>
The longitudinal range having the waist elastic member and the longitudinal range having the leg elastic member partially or entirely overlap,
At least one of the bonded portions on both sides of the non-bonded portion of the leg-hole elastic member is a portion where the waist-line elastic member and the leg-hole elastic member intersect with each other. The part that is adhered to the sheet,
The pants type disposable diaper according to claim 1 or 2.

(Function and effect)
Since the waist elastic member is fixed on the exterior sheet along the width direction, a method of applying an adhesive to the elastic member and fixing it on the exterior sheet can be employed. By using this method, the amount of adhesive applied can be reduced to a small amount, and the adhesive is not applied to unnecessary portions of the adhesive, so that the flexibility of the exterior sheet can be maintained. .
It is necessary to provide the leg-hole elastic member and the waist-line elastic member to some extent at some narrow intervals in order to fully exert their respective functions. Intersections can occur.
The present invention has a configuration in which the leg elastic member is also fixed on the exterior sheet by using an adhesive applied to the waist elastic member at the intersection. By setting it as such a structure, it becomes possible to fix in the part which has many cross | intersections with the waist elastic member at least, without applying an adhesive directly to an exterior sheet | seat. Therefore, the flexibility of the exterior sheet can be remarkably improved as compared with the conventional case.

<Invention of Claim 4>
The leg elastic member is a predetermined width continuous in the width direction at the width direction center portion and the side end portion of the diaper and at an intermediate portion located between the width direction center portion and the side end portion. The straight line is bonded to the exterior sheet with an adhesive applied in a pattern, and is spaced between the side end portion and the intermediate portion, and between the widthwise central portion and the intermediate portion. Shaped non-adhesive parts are provided,
The underpants type disposable diaper of any one of Claims 1-3.

(Function and effect)
The portion where the leg elastic member is tightly curved or bent is preferably the center in the width direction and an intermediate portion between the center in the width direction and the side end in terms of fit to the leg periphery. Further, as described above, if the end portion of the leg-hole elastic member is not sufficiently fixed, the elastic member may be pulled into the center in the width direction. Therefore, as described in this section, it is possible to securely fix the leg elastic member in a predetermined pattern while reducing the amount of adhesive applied to the exterior sheet as much as possible by providing an adhesive part and a non-adhesive part. It becomes.

<Invention of Claim 5>
The longitudinal range having the waist elastic member and the longitudinal range having the leg elastic member partially or entirely overlap,
The leg-hole elastic member is formed of an adhesive applied in a pattern having a predetermined width that is continuous along the width direction, of the both side ends of the diaper and the width direction intermediate portion between them. The pants according to any one of claims 1 to 3, wherein the pants are bonded to the exterior sheet together with the waist elastic member only at a portion intersecting with the waist elastic member at an intermediate portion in the width direction. Type disposable diapers.

(Function and effect)
By limiting the adhesion of the leg elastic member to both side ends and the intersection with the waist elastic member, the amount of adhesive applied to the outer sheet can be significantly reduced compared to the conventional case, Flexibility can be significantly improved.

  As described above, according to the present invention, there is an advantage that the fitting property in the exterior sheet is sufficiently ensured by the elastic member, but the flexibility is increased.

It is a top view (inner surface side) of the underpants type disposable diaper of a deployment state. It is a top view (outer surface side) of the underpants type disposable diaper of a deployment state. It is a principal part top view of the underpants type disposable diaper of an unfolded state. It is CC sectional drawing of FIG. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a perspective view of the wearing state of a pants type disposable diaper. It is a top view which shows 1st Embodiment of a leg periphery elastic member arrangement | positioning and an adhesive application pattern. It is a top view which shows 2nd Embodiment of a leg periphery elastic member arrangement | positioning and an adhesive application pattern. It is a top view which shows 3rd Embodiment of leg periphery elastic member arrangement | positioning and an adhesive application pattern.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1-7 has shown the underpants type disposable diaper 1 of embodiment. This pants-type disposable diaper 1 (hereinafter also simply referred to as diaper) has an exterior sheet 20 having a front body F and a back body B, and an interior body 10 fixed and integrated on the inner surface of the exterior sheet 20. The interior body 10 is formed by interposing an absorber 13 between a liquid-permeable top sheet 11 and a liquid-impermeable back sheet 12. In manufacturing, after the back surface of the interior body 10 is fixed to the inner surface (upper surface) of the exterior sheet 20 by a joining means such as a hot melt adhesive G, the interior body 10 and the exterior sheet 20 are the front body F and the back body. The waist opening and a pair of left and right leg openings are formed by folding at the center of the vertical direction (front-rear direction), which is the boundary of B, and joining both sides thereof by heat welding or hot melt adhesive. A pants-type disposable diaper.

(External sheet structure example)
As shown in FIGS. 4 to 6, the exterior sheet 20 is a nonwoven fabric sheet having a two-layer structure composed of an upper layer nonwoven fabric 20 </ b> A and a lower layer nonwoven fabric 20 </ b> B (that is, the lower layer nonwoven fabric is the outermost nonwoven fabric in this embodiment). Various elastic members are disposed between the upper layer nonwoven fabric 20A and the lower layer nonwoven fabric 20B, and between the nonwoven fabrics of the folded portion 20C formed by folding the lower layer nonwoven fabric 20B to the inner surface side at the waist opening edge, thereby imparting elasticity. The planar shape has a pseudo hourglass shape as a whole by concave leg-around lines 29 formed to form leg openings on both sides of the middle.

  In particular, in the illustrated exterior sheet 20, as the elastic member, in the developed shape shown in FIGS. 1 to 3, the waist elastic members 24, 24. The back body B has a plurality of waist elastic members 25, 25... Arranged at intervals in the vertical direction along the width direction, and the waist elastic members in the front body F and the back body B respectively. Separately from the groups 25, 25..., Both sides of the interior body 10 are curved toward the opposite body side toward the center of the width direction from the joint edge on both sides joining the front body F and the back body B. A plurality of leg-holes elastic members 26, 28, which extend to overlapping portions (or do not necessarily overlap each other, such as in the vicinity of both side portions) and are arranged at intervals without crossing each other. prepare for That. In addition, in this exterior sheet 20, what is called a leg periphery elastic member substantially continuous along the leg periphery line 29 is not provided.

  The waist elastic members 24, 24... Are disposed in the vicinity of the waist opening edge in the range of the side joint edges 21 and 22 where the front body F and the back body B are joined, with a space in the vertical direction. A plurality of thread rubber-like elastic members for attaching a diaper to the body by applying an expansion / contraction force so as to tighten around the waist of the body. For the waist elastic member 24, rubber thread is used in the illustrated example. However, for example, a tape-like elastic member may be used. Moreover, although the waist part elastic members 24, 24 ... of an illustration form are clamped between the nonwoven fabrics of the folding | returning part 20C of the lower layer nonwoven fabric 20B in a waist part, even if it clamps between 20 A of upper layer nonwoven fabrics, and the lower layer nonwoven fabric 20B. good.

  The waist elastic members 25, 25... Are elastic rubber members arranged along the width direction at intervals in the vertical direction over a range from the upper part to the lower part of the side joint edges 21, 22. It is an elastic member, and applies elastic force in the width direction to the waist portions of the front body F and the back body B, respectively, to bring the diaper into close contact with the body. Note that the boundary between the waist elastic members 24, 24... And the waist elastic members 25, 25. For example, among the elastic members arranged in the width direction with an interval in the vertical direction on the front body F and the back body B, even if the number cannot be specified, several on the upper side function as the waist elastic members. The remaining elastic members only have to function as waist elastic members.

  In the back body B, the back leg elastic members 26, 26... Disposed separately from the waist elastic members 25, 25... A curve line or a bend line in which the vertical crossing angle θ increases within a range of 0 to 90 degrees from the minimum point to both sides in the width direction. In a state where the diaper is unfolded, it is arranged along a predetermined curve having a crossing portion 70 having a vertical crossing angle θ of 60 degrees or less in a region overlapping with both side portions of the interior body. There may be one dorsal leg-hole elastic member 26, but preferably a plurality of dorsal leg-hole elastic members 26. In the illustrated example, there are five elastic rubber-like members, and these dorsal leg-hole elastic members 26, 26. Are arranged at intervals without crossing each other. This dorsal leg-hole elastic member group 26, 26,... Does not have about two or three elastic expansion / contraction members arranged close together in a substantial bundle, but forms a predetermined expansion / contraction zone. It is desirable that 3 or more, preferably 5 or more are arranged at intervals of 3 to 20 mm, preferably 6 to 16 mm.

  In the front body F of the exterior sheet 20, the ventral leg-hole elastic members 28, 28... Arranged separately from the waist elastic member groups 25, 25. A curve line or a bend line having a minimum point at which θ is minimum and the longitudinal crossing angle θ increases in the range of 0 degrees to 90 degrees from the minimum point toward both sides in the width direction. Arranged along a predetermined curve having a crossing portion 70 having a vertical crossing angle θ of 60 degrees or less in a region overlapping with both side portions of the interior body in the unfolded state. The abdominal leg-hole elastic members 28, 28... May be one, but preferably a plurality, and in the illustrated example, there are five thread-like elastic members. Are arranged at intervals without crossing each other. The ventral leg-hole elastic members 28, 28,... Are not substantially arranged as a bundle with a few intervals between the two or three elastic elastic members so as to form a predetermined elastic zone. It is desirable that 3 or more, preferably 5 or more are arranged at intervals of 3 to 20 mm, preferably 6 to 16 mm.

  In the illustrated example, the waistline elastic members 25, 25... And the legline elastic members 26, 28... Arranged in the front body F and the back body B are not provided in a portion crossing the interior body 10. The part is a non-stretchable region. Thus, the form which does not have or is not provided with the elastic member includes the form in which the elastic member is present, but also the form in which the elastic member is present but is finely cut to the extent that the contraction force does not act. For example, as the latter example, the waist elastic members 25, 25... And the leg elastic members 26, 28... Cross the interior body 10 from the side joint edge 22 on one side and the other (opposite) side. After providing continuously to the part joining edge 22, the general form which cut | disconnects part or all of the part which traverses the interior body 10, and makes it discontinuous is contained. By making the elastic member discontinuous at the portion overlapping the interior body 10, it is possible to further prevent the interior body (particularly, the absorbent body 13) from contracting in the width direction. Of course, the waist elastic members 25, 25... And the leg elastic members 26... 28 can be continuously arranged across the interior body 10.

  The above-described exterior sheet 20 can be manufactured by, for example, techniques described in Japanese Patent Application Laid-Open No. 4-28363 and Japanese Patent Application Laid-Open No. 11-332913. In addition, in order to cut the leg elastic members 26, 28,... On the interior body 10 to make them discontinuous, Japanese Patent Laid-Open Nos. 2002-35029, 2002-178428, and 2002-273808 are disclosed. The described cutting method is preferably employed.

  Unlike the illustrated example, the leg elastic member may be provided only on either the front body F or the back body B. When the leg elastic members 26, 28,... Are provided on both the front body F and the back body B, part or all of the group of leg elastic members arranged on the front body F side and the back body B Although a form (not shown) in which a part or all of the group of leg-hole elastic members 26 arranged on the side intersect can also be adopted, the leg-hole elastic member arranged on the front body F side as shown in the figure. The group of 28 and the group of leg-hole elastic members B arranged on the back body B side are separated in the longitudinal direction at positions slightly deviated from the front-rear intermediate portion, particularly the front body F, without crossing each other. The minimum vertical separation distance in the vertical separation range 90 is preferably about 10 to 15 mm, and a wide fixed region described later is preferably provided in this portion.

(Form relating to softening of exterior sheet 20)
FIG. 8 is a plan view showing the first embodiment of the arrangement of the leg-hole elastic members and the adhesive application portion. B1 and B2 indicate the application site of the hot melt adhesive in the manufacturing process, and the leg-hole elastic members 26, 28, ... indicate the state before cutting of the portion crossing the interior body 10 as indicated by the two-dot chain line. ing. The adhesive B1 for fixing the waist elastic member 24 and the waist elastic member 25... To both the sheet layers 20A and 20B is substantially applied only to the arrangement site of the elastic members 24 and 25 and the vicinity thereof. Such application of the adhesive can be realized by sandwiching the elastic members 24 and 25 having the adhesive applied to the outer peripheral surface between the two sheet layers 20A and 20B, and the outer peripheral surfaces of such elastic members 24 and 25. The adhesive can be applied to a Nordson Surerup nozzle.

  On the other hand, the adhesive for fixing the leg-hole elastic members 26, 28,... To the two sheet layers 20A, 20B is a rectangular shape arranged side by side along the curved direction of the leg-hole elastic members 26, 28,. Is applied to the adhesive application portion B2. The adhesive application part B2 is formed by directly applying an adhesive to the exterior sheet 20A and / or 20B at a predetermined position, and fixes the leg-around elastic members 26, 28, and the like by sandwiching both sheets. . The adhesive application part B2 is continuously arranged with a predetermined width along the width direction. When the adhesive application part B2 is arranged not only in the above-mentioned stepped part but also in the center part in the width direction of the leg elastic member, the shape of the leg elastic members 26 ..., 28 ... in the vicinity of the cutting part and the cutting part. Is preferable (center adhesive portion f1). The adhesive application part B2 is continuously arranged with a predetermined width along the width direction.

  In any of the bonding portions B1 and B2, the adhesive is not applied without a gap, but is applied in a predetermined pattern such as a spiral, so that the elastic expansion and contraction force of the elastic member at the bonded portion is maintained.

  The adhesive application portion B2 is not disposed so as to fix the entire leg-hole elastic member, but has a separation portion that is separated in the width direction, and intermittently fixes the elastic member. An intermediate adhesion part f2 is provided in the middle between the adhesion part f1 and the side edge part in the center in the width direction, a separation part d2 is provided between f1 and f2, and a separation part d1 is provided between f2 and the side edge part. Since the leg-hole elastic member is bonded in a pulled state, the leg-hole elastic member has a linear structure in which both ends are fixed to the bonding portion in the separated portions d1 and d2. Since the separated portions d1 and d2 are the portions where the wearer's iliac bone and the heel portion are respectively contacted, the amount of adhesive applied at this portion is reduced as much as possible so that the flexibility is not impaired. It becomes possible to improve. In the example shown in the figure, there are four spacing portions B2 for the front viewing time F and the rear viewing time B, respectively, but the number of the separation portions may be increased as long as the pattern of the leg-hole elastic members can be maintained.

  The both ends of the leg-hole elastic member are simultaneously fixed to the joint portions when the front body F and the back-stage B are joined together by heat welding or hot melt adhesive. However, since the cutting and joining of the side end portions are performed at the same time, if the joining strength is not sufficient, there is a possibility that the leg-hole elastic member of the separated portion d1 is drawn to the center in the width direction simultaneously with the cutting. For this reason, it is preferable to provide an adhesive application site B2 at both side end portions (side end adhesive portion f3).

  It is preferable that the adhesive application portion B2 is only the region where the leg-around elastic members 26, 28, and the vertical and horizontal predetermined distances a thereof are within a certain range other than the separated portions d1 and d2 regions. . Each predetermined distance a is desirably 25 mm or less, more preferably 10 mm or less, and particularly preferably 5 mm or less. Furthermore, it is preferable not to use an adhesive between the sheet layers 20A and 20B other than B1 and B2. Thus, hardening by an adhesive agent can be suppressed by reducing an adhesive application part as much as possible.

  As described above, as a specific method for forming the adhesive application portion B2 in a stepped shape or providing a separation portion in the width direction, the lateral direction (diaper width direction) of the sheet layers 20A and 20B is the line MD direction. In a normal configuration along the (flow direction), in the coating process, a plurality of slot coating nozzles are arranged in parallel in the line CD direction (direction intersecting the MD direction), and the adhesive is applied independently and intermittently from each nozzle. The method to do can be used conveniently.

  In the illustrated example, the longitudinal range having the waist elastic members 25 ... and the longitudinal range 31 having the leg elastic members 26, 28 ... partially overlap. A structure without 30 may be used. When there is an overlapping portion 30, the leg elastic members 26, 28, ... are bonded to the outer peripheral surface of the waist elastic member 25 at the intersection with the waist elastic member 25 in addition to the adhesive application portion B2. You may adhere | attach on an exterior sheet | seat by agent B1.

(Other embodiment regarding softening of exterior sheet 20)
FIG. 9 shows a developed view of the second embodiment of the arrangement of the leg-hole elastic members and the adhesive application portion. In the illustrated example, the waist elastic members 25 are bonded to the entire longitudinal direction at substantially the same interval, but the interval between the elastic members 25 may be appropriately changed depending on the portion.

  In this embodiment, the longitudinal range 31 having the leg-hole elastic members 26, 28, etc. has a structure that entirely overlaps with the vertical range having the waist-hole elastic part 25. The leg-hole elastic members 26, 28, ... are bonded to the sheet layers 20A, 20B by an adhesive B1 applied to the outer peripheral surface of the waist-line elastic members 25, except for the width direction end. Since the adhesive B1 is applied only to the waist elastic member 25 and the vicinity thereof, the leg elastic members 26..., 28. . It becomes linear between the adhesion parts by B1 of the leg periphery elastic members 26 ..., 28 ....

Also in this embodiment, it is preferable to provide the adhesive application site B2 at both side ends in order to prevent the leg-end elastic member side end from being pulled into the center in the width direction (side end bonding portion f3).
As shown in FIG. 10, it is good also as a form which does not arrange | position a waist elastic member in the vertical direction center part, but provides the adhesive application part B2 in the vertical direction center and the width direction center part.

(Structural example of interior body)
As shown in FIGS. 5 to 7, the interior body 10 has an absorbent body 13 interposed between a liquid-permeable top sheet 11 made of a nonwoven fabric or the like and a liquid-impermeable back side sheet 12 made of polyethylene or the like. The excretory fluid that has permeated through the top sheet 11 is absorbed and retained.

  As the liquid-permeable surface sheet 11 covering the surface side (skin contact surface side) of the absorbent body 13, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. The material fibers that make up the nonwoven fabric can be synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester or polyamide, recycled fibers such as rayon or cupra, natural fibers such as cotton, and the spunlace method. A nonwoven fabric obtained by an appropriate processing method such as a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft. When a large number of through holes are formed in the liquid permeable surface sheet 11, urine and the like are quickly absorbed, and the dry touch property is excellent. The liquid permeable top sheet 11 is wound around the side edge of the absorber 13 and extends to the back side of the absorber 13.

  As the liquid-impermeable back sheet 12 that covers the back surface side (non-skin contact surface side) of the absorbent body 13, a liquid-impermeable plastic sheet such as polyethylene or polypropylene is used. Those having wettability are preferably used. This water-impervious and moisture-permeable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. is there.

  Absorbent body 13 is a known one, for example, a pulp fiber stack, a filament aggregate such as cellulose acetate, or a non-woven fabric, mixed with a superabsorbent polymer as necessary, fixed, etc. In the example shown in the figure, a shape formed with a substantially rectangular planar shape is used, and the width dimension is a dimension width that does not give the wearer a feeling of goreness by hitting the crotch part. The absorbent body 13 can be packaged with a wrapping sheet 14 having liquid permeability and liquid retention, such as crepe paper, if necessary, for holding the shape and polymer. The shape of the absorber 13 may be a rectangular shape as shown in the figure, or may be an hourglass shape (constricted shape) in which the width of the crotch portion is narrower than the back side and the abdominal side.

  It is preferable that a solid gather BS that fits around the legs is formed on both sides of the interior body 10. This three-dimensional gathered BS is formed by the gathered nonwoven fabric 15. As the gathered nonwoven fabric, as shown in FIG. 6 and FIG. 7, a nonwoven fabric made into a double sheet by folding is preferably used. The side edge portion of the wound absorbent body 13 is further wound from the upper side thereof and extends to the back surface side of the absorbent body 13 to be bonded. More specifically, the gathered nonwoven fabric 15 has a three-dimensional gather BS forming portion left in the middle portion in the longitudinal direction of the diaper 1, and a range from the middle portion in the width direction to the back side of the absorbent body 13 is bonded by a hot melt adhesive or the like. Further, at the longitudinal front and rear end portions, the section from the width direction intermediate portion to the one side end edge is bonded in a range extending to the back surface side of the absorber 13, and a portion forming the three-dimensional gather BS is attached to the absorber 13 It is bonded with a hot melt adhesive or the like while being folded at the upper surface.

  Inside the gathered nonwoven fabric 15 formed of a double sheet nonwoven fabric, a plurality of thread-like elastic elastic members 16, 16... The thread-like elastic stretch members 16, 16... Are for forming a three-dimensional gather BS by raising the nonwoven fabric portion protruding from the absorber side edge by elastic stretch force as shown by a two-dot chain line in FIG. It is.

  The liquid-impermeable back side sheet 12 enters the inside of the double sheet-like gathered nonwoven fabric 15 and constitutes a leak-proof wall on the lower end side of the three-dimensional gathered BS as shown in FIG. . As the liquid-impermeable back side sheet 12, it is desirable to use an opaque sheet so that brown such as defecation and urine does not appear. As the opacification, a plastic film and a pigment and filler such as calcium carbonate, titanium oxide, zinc oxide, white carbon, clay, talc and barium sulfate are preferably used.

  As the thread-like elastic elastic member 16, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, and the like that are usually used can be used. In order to make it difficult to see from the outside, it is preferable that the thickness is 925 dtex or less, the tension is 150 to 350%, and the interval is 7.0 mm or less. Instead of the thread-like elastic elastic member, a tape-like elastic elastic member having a certain width may be used.

  In the same manner as the liquid-permeable surface sheet 11, the material fiber constituting the gathered nonwoven fabric 15 is made of synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester or amide, recycled fibers such as rayon or cupra, and cotton. Non-woven fabric obtained by an appropriate processing method such as a spunbond method, a thermal bond method, a melt blown method, a needle punch method, etc. can be used. It is preferable to use a nonwoven fabric that suppresses the basis weight and has excellent air permeability. Furthermore, for the gathered nonwoven fabric 15, in order to prevent the transmission of urine and the like, to prevent fogging, and to enhance the touch to the skin (dry feeling), silicon-based, paraffin metal-based, alkylchromic croid-based water repellent, etc. It is desirable to use a water-repellent non-woven fabric coated with.

(Fixing the interior and exterior sheets)
The interior body 10 and the exterior sheet 20 are fixed to each other with a characteristic structure. As shown in FIG. 3, when the diaper is unfolded, an intersection 70 where the acute angle crossing angle θ between the leg elastic members 26, 28,... The outer sheet 20 and the inner body 10 are not fixed in a vertical range (80% or more in the illustrated example) of the enclosed dot pattern portion), and the other portions 80, 81, and 82 are not fixed. The exterior sheet 20 and the interior body 10 are fixed by a joining means such as a hot melt adhesive. As a result, the contraction force of the leg-hole elastic members 26, 28, ... is not applied to the side part of the interior body 10 almost or not. As a result, the leg-hole elastic members 26, 28 ... Even in the overlapping region, the thickness and hardness of the diaper are approximately the same as the surroundings, and recumbency is less likely to occur on the inner surface of the interior body 10. In addition, as long as 80% or more of the vertical range of the intersecting portion 70 is a fixed portion, not only a form in which the entire portion is continuously fixed as in the illustrated example, but also a portion of the intersecting portion is not fixed. It is also possible to fix it intermittently within the intersection.

  On the other hand, as described above, when the non-fixed region 71 is provided in the range including the intersecting portion 70, the fixed region between the exterior sheet 20 and the interior body 10 is inevitably reduced in the same vertical range as the intersecting portion 70. . Therefore, in a state where the diaper is unfolded and the position in the vertical direction is the same as that of the intersecting portion 70, a non-stretchable region not having an elastic member is provided on the center side in the width direction of the intersecting portion 70 and the portion is attached to the exterior sheet 20 In the range where the longitudinal position is on the waist side of the intersecting portion 70 from the width direction center side edge of the intersecting portion 70 to the width direction center side of the intersecting portion 70, the fixing region 80 with the interior body 10 is used. It is desirable to provide a non-stretchable region that does not have an elastic member and to use that portion as a fixing region 81 between the exterior sheet 20 and the interior body 10. Specifically, as in the illustrated example, the fixed width between the exterior sheet 20 and the interior body 10 is set to be equal to or less than the interval between the intersecting portions 70 on both sides in the width direction in the same vertical range as the intersecting portion 70. On the waist side, it is proposed to make it wider (may be enlarged stepwise as in the illustrated example or may be enlarged continuously). Thereby, fixation of the interior body 10 becomes stronger.

  Further, the leg-hole elastic members 26, 28,... Are arranged on the front body F and the back body B, respectively, and the longitudinal separation range 90 is secured without crossing the front and rear leg-hole elastic members 26, 28, respectively. In addition, in this longitudinally separated range 90 as well, a non-stretchable region not having an elastic member is provided from the width direction center side edge of the intersecting portion 70 to the width direction center side of the intersecting portion 70 and the portion is provided. It is also proposed that the fixing region 82 between the outer sheet 20 and the inner body 10 is set so that the fixed width in the longitudinally spaced range 90 is wider than the fixed width in the same vertical range as the intersecting portion 70. Thereby, fixation of the interior body 10 can be made still stronger.

(Front / rear presser sheet)
As shown in FIGS. 1 and 4, in order to cover the front and rear end portions of the interior body 10 attached on the inner surface of the exterior sheet 20 and to prevent leakage from the front and rear edges of the interior body 10, 50, 60 are provided. The illustrated embodiment will be described in more detail. The front presser sheet 50 extends over the entire width direction from the inner surface of the folded portion 20C of the waist side end portion to the position overlapping the front end portion of the interior body 10 in the inner surface of the front body F. The rear presser sheet 60 extends across the entire width direction from the inner surface of the folded portion 20C at the end on the waist side to the position overlapping the rear end of the interior body 10 in the inner surface of the back body B. If a slight non-adhesive portion is provided in the crotch side edges of the front and rear presser sheets 50, 60 over the entire width direction (or only the central portion), not only the adhesive does not stick out, but also this portion is removed from the surface sheet. It can be lifted slightly to function as a leak-proof wall.

  When the front and rear presser sheets 50 and 60 are attached as shown in the figure, there is an advantage that the degree of freedom of material selection is increased, but there are also disadvantages such as an increase in materials and manufacturing processes. Therefore, the folded portion 20C formed by folding the exterior sheet 20 on the inner surface of the diaper 1 can be extended to a portion overlapping the absorbent pad 200 to form a portion equivalent to the presser sheets 50 and 60 described above.

(About the non-woven fabric constituting the exterior sheet)
Of the non-woven fabrics constituting the exterior sheet 20, at least the outermost non-woven fabric 20B preferably has a twist degree of 3.8 gf · cm / cm or less. It is desirable to employ the same nonwoven fabric as the outermost nonwoven fabric 20B for all the nonwoven fabrics constituting the exterior sheet 20, that is, the other nonwoven fabrics 20A, 50, 60 that are not located on the outermost side (the same applies hereinafter). In this way, when a nonwoven fabric with a sufficiently low twist is used, the flexibility of the diaper as a whole is significantly increased. In addition, there are advantages such as easy removal and attachment. If the degree of twist is not sufficiently low, the effect of improving flexibility is not exhibited. Such a twist degree can be achieved, for example, by selecting the type of raw fiber, reducing the fineness, shortening the fiber length, reducing the basis weight or thickness, and the like.

  Further, the ratio MIU / MMD between the average surface friction coefficient and the average deviation in the outermost nonwoven fabric 20B is preferably 20 or more, and more preferably 25 or more. By sufficiently increasing the MIU / MMD ratio, the feel of the exterior sheet surface is improved, so that the suppleness is compensated, and skin troubles such as itching and rash due to rubbing with the skin are further reduced. become. Such an MIU / MMD ratio can be achieved, for example, by reducing the fineness or performing surface processing.

In addition, the outermost nonwoven fabric 20B has a thickness when the basis weight is 10 to 30 g / m ² and the pressure is 0.5 g / cm ² so as not to impair the basic functions (hiding function, strength, etc.) as the exterior sheet 20. It is preferable that T0 is 0.1 to 1.0 mm. A more preferable basis weight is 13 to 22 g / m ² , and a thickness T0 is 0.1 to 0.5 mm.

  Furthermore, in order to compensate for flexibility, the bending resistance of the outermost nonwoven fabric 20B according to JIS-L-1096 (45 degree cantilever method) is preferably 45 mm or less, and more preferably 35 mm or less. Thereby, the reduction of the feeling of tingling and the ease of putting on and taking off become even more preferable. Such bending resistance can be achieved, for example, by selecting the type of raw fiber, changing the ratio, lowering the embossing pressure, reducing the basis weight or thickness, and the like.

  Since the strength tends to decrease when the flexibility is improved, the outermost nonwoven fabric 20B has a tensile strength defined in JIS-P-8113 of 40 to 120 kgf / m in the width direction, particularly 60 to 100 kgf / m, in the front-rear direction. It is preferably 10 to 80 kgf / m, particularly 25 to 60 kgf / m, and the tear strength specified in JIS-P-8116 is preferably 4 to 30 kgf / m, particularly 8 to 25 kgf / m in the front-rear direction. Such tensile strength and tear strength can be achieved, for example, by increasing the degree of entanglement between fibers.

  The compression characteristics of the outermost nonwoven fabric 20B are also closely related to flexibility. Therefore, the compression characteristics of the outermost nonwoven fabric 20B are such that the compression hardness LC is 0.3 to 1.0, particularly 0.5 to 0.9, and the compression work WC is 0.01 to 0.10. The compression resilience RC is preferably 20 to 90%, particularly preferably 25 to 70%. Such compression hardness LC, compression work WC, and compression resilience RC can be achieved, for example, by selecting the type of raw fiber, changing the ratio, reducing the basis weight, and the thickness.

  The outermost nonwoven fabric 20B is not particularly limited with respect to the material, structure, manufacturing method, fineness, fiber length (short fiber, filament), and the like of the raw fiber. For example, the raw fiber can be appropriately selected from olefins such as polyethylene and polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, natural fibers such as cotton, and the fiber structure is parallel. It can be suitably selected from two-layer type composite fibers such as molds and core-sheath types, multilayer type composite fibers, non-composite fibers, mixed fibers, and split fibers. Furthermore, as a manufacturing method, it can select and use suitably from well-known methods, such as the spunlace method, the spun bond method, the thermal bond method, the melt blown method, the needle punch method, the air through method, the point bond method. Known specifications can be adopted for the fineness and fiber length of the fiber, but the fineness is preferably 0.7 to 3 dtex, particularly 1 to 2.5 dtex.

  The present invention can be used in a pants-type disposable diaper as in the above example.

  DESCRIPTION OF SYMBOLS 1 ... Pants type disposable diaper, 10 ... Interior body, 11 ... Liquid-permeable surface sheet, 12 ... Liquid-impermeable back side sheet, 13 ... Absorber, 14 ... Packaging sheet, 15 ... Gathered nonwoven fabric, 16 ... Yarn-like elastic stretch Members, 20 ... exterior sheets, 21 and 22 ... side joint edges, 24 ... waist elastic members, 25 ... waist elastic members, 26 ... dorsal leg elastic members, 28 ... ventral leg elastic members, 29 ... Leg circumference line, 20C ... exterior sheet folded portion, 70 ... crossing portion, 71 ... non-fixed area, 80, 81, 82 ... fixed area, θ ... longitudinal crossing angle, F ... front body, B ... back body.