JP5767783B2 - Pants-type disposable diaper - Google Patents

Description

  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), waist elastic member, which is provided with a waist circumference Ri elastic members and the leg peripheral Ri elastic member (typified described Patent Document 6) has become a high fitting property to the body relatively. 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, waist circumference Ri elastic member, in the region of the longitudinal central portion than the waist portion elastic members, longitudinally spaced apart in which are arranged along the width direction. Further, the leg circumference Ri elastic member, from at least one of both side portions of the front body and the back body is configured to extend while curving so as to be directed in the opposite body side toward the widthwise center.

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, that in order to improve the fit, providing a large number of legs circumferential Ri elastic member, the outer sheet becomes hard by comprising many coating amount of adhesive to secure the elastic member, thereby deteriorating a feeling of attachment There was a problem.
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,
Wherein the region of the longitudinal central portion than the waist portion elastic members, elongated waist circumference Ri elastic member extending along the width direction are a plurality of bonded at intervals in the longitudinal direction,
And extend toward the opposite body side toward the opposite sides in the widthwise center, with longitudinal intersecting angle between the vertical direction has a minimum point that minimizes its longitudinally intermediate the width direction from the minimum point the vertical direction crossing angle is increased within a range of 0 to 90 degrees leg circumference Ri elastic member toward the both sides are bonded,
The leg circumferential Ri elastic member, widthwise central portion of the diaper, the side end portion, and located between them, in the middle portion away from the widthwise central portion and side edge portions, continuously along the widthwise direction The rectangular application part is adhered to the exterior sheet with an adhesive applied in a pattern that is continuous in the vertical direction, and is arranged in a curved shape in the central part and the intermediate part in the width direction,
The leg-around elastic member is bonded to a separation portion between a portion bonded to the side end portion and a portion bonded to the intermediate portion, and a portion bonded to the central portion in the width direction and the intermediate portion. the spaced area between the parts, while being arranged in a straight line respectively, the portion located this straight, except intersection of at least the waist circumference Ri elastic member, the non-adhesive not adhered to the outer sheet Is considered a part ,
The leg-around elastic member is a linearly arranged portion in a separated portion between a portion bonded to the central portion in the width direction and a portion bonded to the intermediate portion, and the vertical crossing angle is the smallest Configured to be
A pants-type disposable diaper characterized by that.

(Function and effect)
Leg circumferential Ri elastic member is fixed since it is necessary to fix in a state of being curved or bent on the outer sheet, as in such Nordson Corporation Sure wrap nozzle, an adhesive is applied to the elastic member on the outer sheet It is not suitable for the configuration. Therefore, the adhesive is applied in a predetermined pattern of spiral or the like outer sheet, a method of placing there the leg peripheral Ri elastic members have been taken. 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 which is not curved or bent to the arrangement pattern of the leg circumferential Ri elastic member, for its part, does not impart an adhesive for the leg peripheral Ri elastic member fixing the free unbonded It has a feature in that it is a part and both sides thereof are adhesive parts. With such a configuration, while reliably fixing the leg peripheral Ri elastic member in a predetermined pattern, it is possible to lower limit significantly the application amount of the adhesive for the elastic member fixing Ri leg circumference, conventional As a result, 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.

Further, when providing the non-adhesive portion straight leg circumference Ri elastic member, on at least one side of the non-adhesive portion, or tight portion of curved or bent, when the end portion of the leg circumferential Ri elastic member is positioned in , for that portion, the leg circumference Ri elastic member adhered and fixed with adhesive applied in a pattern of a predetermined width continuously along the width direction, pulling the ends of the curved retaining the shape, or the leg circumference Ri elastic member It is preferable to prevent it. When fixing the ends of the leg circumferential Ri elastic member is insufficient, there is a possibility that pull occurs in the elastic member in the width direction center side.

Also, sites leg circumference Ri elastic member is tightly curved or bent, the widthwise central portion and is an intermediate portion between the widthwise central portion and the side edge portion is preferred in terms of the leg circumferential Rinitaisuru fit. Further, as described above, when fixing the ends of the leg circumferential Ri elastic member is insufficient, there is a possibility that pull occurs in the elastic member in the width direction center side. Therefore, as in the present invention, by providing an adhesive portion and a non-adhesive portion while an adhesive coating weight of the outer sheet as much as possible reduced, it is possible to securely fix the leg peripheral Ri elastic member in a predetermined pattern It becomes.

  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 plan view showing a first embodiment of the adhesive application pattern and the leg peripheral Ri elastic members disposed. It is a plan view showing a reference embodiment of the adhesive application pattern and the leg peripheral Ri elastic members disposed. It is a plan view showing the adhesive application pattern reference embodiment the leg peripheral Ri elastic members disposed.

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. Planar shape, the concave leg circumference Ri line 29 formed in order to form the respective leg openings in the intermediate sides, and has a pseudo hourglass shape as a whole.

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, and the vertical direction at intervals and having a plurality of waist circumference Ri elastic members 25, 25 and disposed along the width direction, in each of the front body F and the back body B, Ri waist circumference Separately from the elastic member groups 25, 25..., Both sides of the interior body 10 are curved so as to be directed toward the opposite body side from the both side joint edges joining the front body F and the back body B toward the center in the width direction. to the site that overlaps with the parts (or the like to the vicinity of both sides, not necessarily even may not overlap) with extending, elastic members 26 ... Ri plurality of legs circumferentially arranged at intervals without intersecting each other, With 28 ... That. In Hongaiso sheet 20, substantially continuous along the leg circumference Ri line 29, Tokoroiashi circumferential Ri elastic member 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 thread rubber-like elastic member of plural rows, is intended for mounting the diaper to the body by providing the stretching force to tighten the Ri waist circumference of the body. As the waist elastic member 24, thread rubber is used in the illustrated example, but a tape-like elastic member may be used, for example. Further, the waist elastic members 24, 24... Shown in the figure are sandwiched between the nonwoven fabrics of the folded portions 20C of the lower layer nonwoven fabric 20B at the waist, but may be sandwiched between the upper nonwoven fabric 20A and the lower layer nonwoven fabric 20B. good.

Waist circumference Ri elastic members 25, 25, of the lateral joint edges 21 and 22, generally over a range from the top to the bottom, vertically at intervals is disposed along the width direction yarns rubbery a resilient member provides an elastic force of the respective width direction waist circumference Ri portion of the front body F and the back body part B, and intended for adhering the diaper to the body. Note that the boundary of the elastic member 25, 25 and Ri circumferential waist elastic members 24, 24 ... and the waist may not always clear. 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 may only function as waist circumference Ri elastic member.

In the back body B, waist circumference Ri elastic members 25, 25 ... spine is separately disposed from the side leg circumference Ri elastic members 26, 26 has its longitudinally intermediate acute side intersection angle between the vertical direction theta (hereinafter , Also referred to as a longitudinal crossing angle), and a curved line or a bending line in which the vertical crossing angle θ increases within a range of 0 to 90 degrees from the minimum point toward both sides in the width direction. And it is arrange | positioned along the predetermined | prescribed curve which has the cross | intersection part 70 whose longitudinal direction crossing angle (theta) becomes 60 degrees or less in the area | region which overlaps with the both sides of an interior body in the state which expand | deployed the diaper. . Segawaashi circumferential Ri elastic member 26 is preferably be a single but a plurality of, a thread rubber-like elastic member of five in the illustrated example, these dorsal leg circumference Ri elastic member 26, 26 are arranged at intervals without crossing each other. The dorsal leg circumference Ri elastic member groups 26, 26, rather than being substantially disposed as Ichitaba by closely spacing the two or three degree of resilient and elastic members to form a predetermined stretching zone Thus, it is desirable that 3 or more, preferably 5 or more are arranged with an interval of about 3 to 20 mm, preferably about 6 to 16 mm.

Vertical in front body F of the exterior sheet 20, the waist circumference Ri elastic member groups 25, 25 separately disposed has been ventral leg circumference Ri elastic members and 28 ... also, the longitudinal direction in the longitudinal direction of the intermediate A curve line or a bend line having a minimum point at which the crossing angle θ is minimum, and the vertical crossing angle θ increasing within a range of 0 to 90 degrees from the minimum point toward both sides in the width direction; It arrange | positions along the predetermined | prescribed curve which has the cross | intersection part 70 whose longitudinal direction crossing angle (theta) becomes 60 degrees or less in the area | region which overlaps with the both sides of an interior body in the state which expand | deployed the diaper. Haragawaashi circumferential Ri elastic members 28, 28 ... are preferably may be a single but a plurality of a thread-shaped elastic members of five in the illustrated example, these ventral leg circumference Ri elastic member 28 , 28... Are arranged at intervals without crossing each other. The ventral leg circumference Ri elastic member groups 28, 28 ... also, rather than being substantially disposed as Ichitaba by closely spacing the two or three degree of resilient and elastic members to form a predetermined stretching zone Thus, it is desirable that 3 or more, preferably 5 or more are arranged with an interval of about 3 to 20 mm, preferably about 6 to 16 mm.

In the illustrated example, the front body F and the back body B to be arranged a waist circumference Ri elastic members 25, 25 and leg circumference Ri elastic members 26 ..., 28 ..., in part across the inner body 10 is provided In other words, the portion 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, examples of the latter, waist circumference Ri elastic members 25, 25 and leg circumference Ri elastic members 26 ..., 28 ..., whereas the side of the side joint edge 22 across the inner body 10 the other (opposite) side After the side joint edge 22 is continuously provided, a general form in which a part or all of the portion crossing the interior body 10 is cut and discontinuous is included. 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, waist circumference Ri elastic members 25, 25 and leg circumference Ri elastic members 26 ..., 28 ..., and may be continuously disposed across the inner 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. The elastic members 26 ... Ri leg circumference, 28 ... to cut discontinuity of on inner body 10 is JP 2002-35029, JP 2002-178428 and JP 2002-273808 JP Is preferably employed.

Unlike the example shown, it may be only provided only leg circumference Ri elastic members, on either of the front body F and the back body B. The elastic members 26 ... Ri leg circumference, 28 ... and, before a case of providing both the body F and the back body B, a part or all of the group of front body F arranged on the side legs circumferential Ri elastic member, after legs but a part or all of a group of elastic members 26 Ri leg circumference arranged on the body B side can be employed also form crossing (not shown), which is arranged, in front body F side in the illustrated example and the group of the elastic members 28 Ri circumferential, longitudinal direction intermediate portion without the group of back body B is placed on the side leg circumference Ri elastic member B intersect each other, in the longitudinal direction at a position deviated slightly front body F in particular A separated form is suitable, and the minimum longitudinal separation distance in the longitudinal 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)
Figure 8 is a plan view showing a first embodiment of the arrangement and the adhesive application part of the leg circumferential Ri elastic member. B1, B2 indicates the application site of the hot-melt adhesive in the manufacturing process, the elastic member 26 Ri leg circumference ..., 28 ... is a state before the cutting of the portion crossing the inner body 10 as shown by the two-dot chain line Show. The adhesive B1 for fixing Ri circumferential waist elastic members 24 and waist elastic members 25 ... Both sheet layer 20A, and 20B is substantially applied only to the placement site and the vicinity thereof of the elastic members 24, 25 . 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 elastic member 26 Ri leg circumference ..., 28 ... of both sheet layer 20A, an adhesive for fixing to 20B, the elastic member 26 Ri leg circumference ..., 28 ... are arranged in a staircase pattern along a direction of curvature It is applied to the rectangular adhesive application portion B2. Adhesive applying unit B2 is adhesive to the outer sheet 20A and / or 20B are formed by applying directly to the predetermined position, the resilient member 26 ... Ri leg circumference at both sheets, fixing it by clamping the 28 ... To do. The adhesive application part B2 is continuously arranged with a predetermined width along the width direction. Adhesive applying unit B2 is not only stepped portion described above, when placed in the central portion in the width direction of the leg circumferential Ri elastic member, the cutting portion and the cutting portion near the leg peripheral Ri elastic members 26 ..., 28 ... Is preferable (the center adhesive portion f1).

  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.

Adhesive applying portion B2, instead of being arranged so as to secure the entire leg circumference Ri elastic member having a spaced area spaced apart in the width direction, to fix the intermittent 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 peripheral Ri elastic member is adhered in a state of being pulled, in spaced-apart portions d1, d2, leg circumferential Ri elastic member is a linear structure which is fixed at both ends to the adhesive portion. 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.

Both side ends of the leg circumferential Ri elastic member, the front body F and guardian around B is when they are joined, such as by thermal welding or hot melt adhesive to each other, are fixed to the connection part at the same time. However, since the cutting of the side edge portion bonding is performed at the same time, the bonding strength is insufficient, there is a risk that the leg peripheral Ri elastic member cut at the same time spaced area d1 is drawn to the lateral center side. For this reason, an adhesive application site B2 is also provided at both end portions (side end bonding portion f3).

Adhesive applying portion B2, in addition spaced area d1, d2 region, the elastic members 26 ... Ri leg circumference, that 28 ... disposed portions and the aspect each predetermined distance a is only area such that within a predetermined preferable. 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 extent and the leg peripheral Ri elastic member 26 having a waist circumference Ri elastic member 25 ... ..., but the longitudinal extent 31 partially overlap with 28 ..., in this embodiment, the It is good also as a structure without the overlapping part 30. FIG. If overlapping portion 30 is, the leg circumference Ri elastic members 26 ..., 28 ..., in addition to the adhesive coating portion B2, at the intersection of the elastic member 25 Ri waist circumference, coated on the outer peripheral surface of the elastic member 25 Ri waist circumference You may adhere | attach on an exterior sheet | seat by the made adhesive agent B1.

(Reference form regarding softening of exterior sheet 20)
Figure 9 shows a developed view of a reference embodiment of the arrangement and the adhesive application part of the leg circumferential Ri elastic member. In the illustrated example, the waist circumference Ri elastic member 25 ... is bonded to the entire longitudinal direction at substantially the same distance, may change the distance between the elastic member 25 suitably by site.

In this embodiment, the elastic members 26 ... Ri leg circumferential, longitudinal extent 31 with 28 ... is a longitudinal extent and overlap all structures having a waist circumference Ri elastic portion 25. Leg circumferential Ri elastic members 26 ..., 28 ..., except for widthwise end, waist circumference Ri elastic member 25 ... sheet layer 20A by an adhesive B1 applied on the outer peripheral surface of and adhered to 20B. Since the adhesive B1 is being applied only to the placement site and the vicinity thereof of the waist circumference Ri elastic member 25, the leg circumference Ri elastic members 26 ..., 28 ..., the sheet at the portion intersecting the elastic member 25 Ri waist circumference Glued. Leg circumferential Ri elastic members 26 ..., a straight line shape in the adhesion portion due to 28 ... of B1.

Also in this embodiment, to prevent retraction of the widthwise center side of the elastic member side end portion Ri leg circumference, it is preferable that the two side portions providing the adhesive application site B2 (side edge adhesive portion f3).
As shown in FIG. 10, in the longitudinal center part without arranging the waist circumference Ri elastic member may be in the form of providing the adhesive application unit B2 in the longitudinal direction center and widthwise center.

(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) where the width of the crotch portion is narrower than the back side and the abdominal side.

Preferably, the both sides of the inner body 10 is formed with three-dimensional gathers BS to fit Ri leg circumference. 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, in a developed state of the diaper, leg circumferential Ri elastic members 26 ..., 28 ... and the longitudinal acute side angle of intersection θ is 60 degrees or less intersection 70 (chain line in FIG. 3 two points In the vertical range (80% or more in the illustrated example), the exterior sheet 20 and the interior body 10 are not fixed, and the other portions 80, 81, In 82, the exterior sheet 20 and the interior body 10 are fixed by a joining means such as a hot melt adhesive. Thus, the elastic member 26 Ri leg circumference ..., 28 ... contraction force ceases applied little or no side of the inner body 10, its result, the leg circumference Ri elastic members 26 ..., 28 ... and the both side portions of the inner body 10 Even in the region where the diapers overlap, the thickness and hardness of the diaper are about the same as the surroundings, and recumbency is hardly generated 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 front body F and the back body B Ri leg circumference respectively the elastic members 26 ..., with placing 28 ..., the longitudinal separation range 90 without intersecting the front and rear leg circumference Ri elastic members 26 ..., 28 ... to each other In addition, in the longitudinally separated range 90, a non-stretchable region having no elastic member is provided from the width direction outer side to the width direction central side of the intersecting portion 70 with respect to the width direction center side edge of the intersecting portion 70. It is also proposed that the portion be a fixed region 82 between the exterior sheet 20 and the interior body 10 and that the fixed width in the longitudinally spaced range 90 be 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 remarkably increased, and as a result, the feeling of wearing and the skin troubles such as itching and rash due to rubbing with the skin are reduced. 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 member, 20 ... outer sheet, 21, 22 ... side joint edge, 24 ... waist elastic member, 25 ... waist circumference Ri elastic member, 26 ... Segawaashi circumferential Ri elastic member, 28 ... Haragawaashi circumferential Ri elastic member , 29 ... leg circumference Ri lines, 20C ... outer sheet folded portion, 70 ... cross-section, 71 ... non-fixed regions, 80, 81, 82 ... fixed area, theta ... longitudinal cross angle, F ...... front body, B ... Back body.

Claims (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,
Wherein the region of the longitudinal central portion than the waist portion elastic members, elongated waist circumference Ri elastic member extending along the width direction are a plurality of bonded at intervals in the longitudinal direction,
And extend toward the opposite body side toward the opposite sides in the widthwise center, with longitudinal intersecting angle between the vertical direction has a minimum point that minimizes its longitudinally intermediate the width direction from the minimum point the vertical direction crossing angle is increased within a range of 0 to 90 degrees leg circumference Ri elastic member toward the both sides are bonded,
The leg circumferential Ri elastic member, widthwise central portion of the diaper, the side end portion, and located between them, in the middle portion away from the widthwise central portion and side edge portions, continuously along the widthwise direction The rectangular application part is adhered to the exterior sheet with an adhesive applied in a pattern that is continuous in the vertical direction, and is arranged in a curved shape in the central part and the intermediate part in the width direction,
The leg-around elastic member is bonded to a separation portion between a portion bonded to the side end portion and a portion bonded to the intermediate portion, and a portion bonded to the central portion in the width direction and the intermediate portion. the spaced area between the parts, while being arranged in a straight line respectively, the portion located this straight, except intersection of at least the waist circumference Ri elastic member, the non-adhesive not adhered to the outer sheet Is considered a part ,
The leg-around elastic member is a linearly arranged portion in a separated portion between a portion bonded to the central portion in the width direction and a portion bonded to the intermediate portion, and the vertical crossing angle is the smallest Configured to be
A pants-type disposable diaper characterized by that.