JP2019150394A - Stretchable structure of absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elastic structure of an absorbent article having excellent fit to a local and three-dimensional convex portion of a body surface and a peripheral portion thereof. SOLUTION: The above-mentioned problem has a three-dimensional deformation region 90 in a region where a first cover layer 91, a second cover layer 92 and an elastic sheet 93 overlap, and a first cover layer 91 and a first cover layer 91 in the three-dimensional deformation region 90. The 2 cover layer 92 is provided with a plurality of slit portions 95, 96 formed of slits or perforations for forming the slits, and the plurality of slit portions 95 intersect with each other and are three-dimensional. All of the portions of the first cover layer 91 and the second cover layer 92 located in the three-dimensional deformation region 90, which pass through the central portion of the deformation region 90 and have both ends extending to the edges of the three-dimensional deformation region 90. However, it is solved by the fact that it is continuous with the portion located outside the three-dimensional deformation region 90 without passing through the slit portions 95 and 96. [Selection diagram] FIG. 10

Description

  The present invention relates to a stretchable structure of an absorbent article that has improved local three-dimensional protrusions on the body surface and fit to the surrounding portions.

  In an absorbent article, in order to improve the fit to the body surface, it is common to provide stretchability at appropriate positions such as around the legs and around the trunk. As a technique for imparting stretchability, conventionally, a technique has been widely adopted in which a large number of elongated elastic members such as rubber thread are stretched in the longitudinal direction and fixed, but the surface fit is excellent. As a thing, the method of attaching an elastic sheet in the state extended in the direction of giving elasticity is also proposed. (For example, refer to Patent Document 1).

  In the laminated stretchable structure in which the elastic sheet is sandwiched between cover layers, the elastic sheet is provided between a first cover layer made of a non-stretchable material such as a non-woven fabric and a second cover layer made of a non-stretchable material such as a non-woven fabric. It is a layered product. The elastic sheet is stretched in the expansion / contraction direction (one direction orthogonal to the thickness direction), and the first cover layer and the second cover layer are arranged in a number of directions in the expansion / contraction direction and the direction orthogonal thereto. The joint is joined through a through-hole formed in the elastic sheet. In the natural length state, the first cover layer and the second cover layer are shrunk toward the first cover layer and the second cover layer as the elastic sheet contracts, and in the state where the elongation is maximum (elastic limit state), the first cover layer accompanies the expansion of the elastic sheet. And the second cover layer becomes taut and the shrinkage wrinkle disappears. This laminated stretchable structure is excellent in surface fit, and there is no bonding between the first cover layer and the second cover layer and the elastic sheet, and there is very little bonding between the first cover layer and the second cover layer. Therefore, it is very flexible, and there is an advantage that the through hole of the elastic sheet contributes to improvement of air permeability.

  However, the stretch direction of such a laminated stretch structure is limited to one direction in which the elastic sheet is stretched during manufacture, that is, the direction perpendicular to the thickness direction. Therefore, there is room for improvement in the fit to the local three-dimensional convex part of the body surface such as the iliac crest and the superior anterior iliac spine and the surrounding part.

  Moreover, in the above-mentioned laminated stretchable structure, since the stretched elastic sheet is sandwiched between the first cover layer and the second cover layer, the arrangement of the stretchable structure is limited depending on the structure of the product and the manufacturing method. Furthermore, in the above-described laminated stretchable structure, the shrinkage ridge inevitably formed in the first cover layer and the second cover layer brings about a unique appearance of the disposable diaper.

  On the other hand, a laminated stretchable structure in which a cover layer in which a linear slit is formed in a non-stretchable material such as a nonwoven fabric is integrated with an elastic sheet is also known (see Patent Document 3). In the laminated stretchable structure using the cover layer having the slit, even if the elastic sheet is integrated with the cover layer in a non-stretched state, the slit can be opened so as to widen more toward the center side, so that the opening deformation of the elastic sheet is reduced. Within the range, it can expand and contract mainly in the direction intersecting with the slit. Of course, the laminated stretchable structure using the cover layer having the slit can be extended in the direction in which the elastic sheet is extended at the time of manufacture even when the elastic sheet is integrated with the slit sheet in the extended state. Within the range of opening deformation of the slit, it can be expanded and contracted in the direction orthogonal to the slit. However, the deformation of the opening of the linear slit has many restrictions on the direction and the like, and the arrangement and dimensions of the slits restrict the expansion / contraction direction, the shape of the extendable part, the degree of expansion / contraction, and the like.

  In addition, another example of a laminated stretchable structure using a cover layer having slits has been proposed in which a cover layer in which a large number of fine linear slits are arranged in a dense staggered pattern and an elastic sheet are integrated. (See Patent Document 4). In this case, by opening each slit so as to widen toward the center side, the cover layer extends in a direction perpendicular to the slit and becomes a slanted net. However, also in this case, since the slit is linear, the expansion / contraction direction and the degree of expansion / contraction are limited.

JP-T-2004-532758 Japanese Patent Application Laid-Open No. 2006-189826 Japanese Patent Laying-Open No. 2015-173689 JP 2006-511375 A

  Then, the main subject of this invention is providing the expansion-contraction structure of the absorbent article which is excellent in the fit with respect to the local three-dimensional convex part of a body surface, and its peripheral part.

Various aspects of the stretchable structure of the absorbent article that have solved the above problems are as follows.
<First aspect>
An elastic sheet, a first cover layer covering the front side of the elastic sheet, and a second cover layer covering the back side of the elastic sheet are integrated,
The first cover layer and the second cover layer do not have elasticity,
A three-dimensional deformation region in a region where the first cover layer, the second cover layer and the elastic sheet overlap;
The first cover layer and the second cover layer in the three-dimensional deformation region are provided with a plurality of slit portions made of slits or perforations for forming the slit,
The plurality of slit portions extend from one edge of the three-dimensional deformation region to the other edge across the three-dimensional deformation region,
The plurality of slit portions intersect each other,
All of the portions located in the three-dimensional deformation region in the first cover layer and the second cover layer are continuous to the portion located outside the three-dimensional deformation region without passing through the slit portion.
An elastic structure of an absorbent article characterized by the above.

(Function and effect)
In the stretchable structure of the absorbent article according to this aspect, the elastic sheet spreads along the slits with the deformation of the first cover layer and the second cover layer so that the plurality of slits spreads more as they approach the intersection. It can be elastically stretched according to. As a result, when a force directed from one side of the thickness direction to the other side is applied to the three-dimensional deformation region, the three-dimensional deformation region follows this and extends mainly in a plurality of directions orthogonal to each slit portion. , It can be deformed so as to be recessed with respect to the surrounding portion. Therefore, if such a three-dimensional deformation region that deforms into a depression is provided at a position in contact with a local three-dimensional convex portion on the body surface, the fitting property to the convex portion and the surrounding portion becomes excellent.
In addition, since a three-dimensional deformation region is determined by a plurality of slit portions, there is no limitation in the expansion / contraction direction and the degree of expansion / contraction is greater than in the conventional example based on a single linear slit. it can.
Furthermore, since all of the portions located in the three-dimensional deformation region in the first cover layer and the second cover layer are continuous to the portion located outside the three-dimensional deformation region without passing through the slit portion, In the manufacturing facility, the first cover layer and the second cover layer can be manufactured simply by providing slit portions.

<Second aspect>
In the three-dimensional deformation region, in a natural length state, a shrinkage wrinkle formed with the shrinkage of the elastic sheet is not formed in the first cover layer and the second cover layer.
The elastic structure of the absorbent article of a 1st aspect.

(Function and effect)
The stretchable structure by the slit portion may be attached in a state where the elastic sheet is extended at the time of manufacture, but it is not necessary. Therefore, by integrating the first and second cover layers with the elastic sheet being substantially unstretched at the time of manufacture, wrinkles (including wrinkles) are not formed as in this aspect, and expansion and contraction with a good appearance It becomes a structure. In this case, by providing only the slit portions in the first cover layer and the second cover layer, there is an advantage that the elastic sheet is clearly hidden by the first cover layer and the second cover layer in the natural length state.

<Third Aspect>
The slit portion includes a plurality of slit portions that pass through a central portion of the three-dimensional deformation region and both end portions extend to an edge of the three-dimensional deformation region.
The elastic structure of the absorbent article of the 1st or 2nd aspect.

(Function and effect)
As in this embodiment, the slit portion can include a plurality of slit portions that pass through the central portion. In this case, the slit portion extends radially (including an X shape and a cross shape) from the central portion of the three-dimensional deformation region. In this aspect, a wide range of three-dimensional deformation regions can be formed with the minimum number of slit portions. This aspect is suitable when the three-dimensional deformation region is a circle, an ellipse, or a rhombus.

<Fourth aspect>
The slit portion passes through a central portion of the three-dimensional deformation region, both end portions extend to the edge of the three-dimensional deformation region, and both ends pass through the end portion of the central slit portion. Including an end slit extending to the edge of the deformation region,
The elastic structure of the absorbent article according to any one of the first to third aspects.

(Function and effect)
Like this aspect, the center slit part and the end slit part which passes the edge part can be included. In this case, the slit portion extends in a T shape, an H shape, or the like. This aspect is suitable when the three-dimensional deformation region is a triangle or a rectangle.

<Fifth aspect>
The absorbent article is
Having a crotch portion including a front-rear direction center, a ventral portion extending forward from the front-rear direction center, and a dorsal side portion extending rearward from the front-rear center,
Having an absorbent body built in a range including the crotch part,
The ventral part and the dorsal part have side flaps that extend to the left and right sides of the absorber,
A connecting means for detachably connecting the back side portion and the abdominal side portion to the side flap portion of the back side portion;
On the outer surface of the ventral portion, the target means is connected to the connecting means,
It is a tape type disposable diaper,
At least one of the widthwise inner side of the connecting means in the side flap portion of the back portion and the outer side of the target portion of the side flap portion of the ventral portion has the three-dimensional deformation region.
The elastic structure of the absorbent article according to any one of the first to fourth aspects.

(Function and effect)
In a tape-type disposable diaper, the inner side in the width direction from the connecting means in the side flap part of the dorsal part and the outer side in the width direction from the target part in the side flap part of the abdominal part are the iliac crest and upper anterior iliac spine. It becomes a part which touches the local three-dimensional convex part of such a body surface. Therefore, it is desirable to provide a three-dimensional deformation region having the above-described slit portion at this site.

<Sixth aspect>
A waist elastic sheet that elastically expands and contracts in the width direction is attached to the back side part over at least the left and right side flap parts,
The region having the waist stretchable sheet is elastically stretchable in the width direction together with the waist stretchable sheet,
Between the waist elastic sheet and the connecting means, the three-dimensional deformation region,
The elastic structure of the absorbent article according to the fifth aspect.

(Function and effect)
It is known that a waist stretchable sheet as in this embodiment is attached to the back side portion of a tape-type disposable diaper to improve the fit around the waist. Such a waist elastic sheet is often difficult to provide up to the vicinity of the connecting means. This is because most tape-type disposable diapers are manufactured in such a manner that the front-rear direction of the product coincides with the MD direction (machine direction) in the production line, or the waist stretchable sheet is attached in a state of extending in the width direction. This is due to the necessity. However, the portion between the waist stretchable sheet and the connecting means is located in the side flap portion, and becomes a portion in contact with the iliac crest as described above. Therefore, it is preferable to provide a three-dimensional deformation region having the above-described slit portion at this portion. Since the three-dimensional deformation region having the slit portion described above can be manufactured simply by providing slit portions in the first cover body and the second cover body in advance and disposing the elastic sheet in a substantially non-extended state, it is conventionally formed. A three-dimensional deformation region can be formed at a difficult position.

  According to the present invention, there are advantages such as excellent fit to local and three-dimensional convex portions on the body surface and surrounding portions.

It is a top view in the state where the diaper was developed showing the inner surface of a tape type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a tape type disposable diaper. FIG. 6 is a sectional view taken along line 6-6 of FIG. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 1. (A) 8-8 sectional view taken on the line of FIG. 1, (b) 9-9 sectional view taken on the line of FIG. (A) 5-5 sectional view taken on the line of FIG. 1, (b) It is sectional drawing in a deformation | transformation state. It is the top view in the developed state of a waist elastic sheet, and (b) sectional drawing. It is a top view which shows various slit parts. It is a top view which shows the various examples of arrangement | positioning of a three-dimensional deformation | transformation area | region. It is a perspective view which shows the deformation | transformation state of a three-dimensional deformation | transformation area | region.

  1-6 has shown an example of the tape type disposable diaper, the code | symbol X in a figure has shown the full width of the diaper except a connection tape, the code | symbol L has shown the full length of the diaper, and it is in sectional drawing. The dotted pattern portion indicates a hot melt adhesive as a joining means for joining the constituent members located on the front side and the back side. Hot melt adhesives can be applied by known methods such as slot coating, continuous line or dotted line bead coating, spiral coating, Z coating, etc., or pattern coating (transfer of hot melt adhesive in relief printing). Can be applied. Instead of or together with this, at the fixing portion of the elastic member, the hot melt adhesive can be applied to the outer peripheral surface of the elastic member, and the elastic member can be fixed to the adjacent member. Examples of hot melt adhesives include EVA, adhesive rubber (elastomer), olefin, and polyester / polyamide types, which can be used without any particular limitation. As a joining means for joining the constituent members, means by material welding such as heat sealing or ultrasonic sealing can be used.

  This tape-type disposable diaper has a crotch part including the center of the front-rear direction LD, a ventral part F extending forward from the center of the front-rear direction LD, and a back part B extending rearward from the center of the front-rear direction LD. is doing. Further, this tape-type disposable diaper includes an absorbent body 56 built in a range including the crotch portion, a liquid-permeable top sheet 30 that covers the front side of the absorbent body 56, and a liquid-impermeable material that covers the back side of the absorbent body 56. It has the sheet | seat 11 and the exterior nonwoven fabric 12 which covers the back side of a liquid-impermeable sheet | seat and comprises the product outer surface. On the other hand, side flap portions SF that do not have the absorber 56 are formed on both sides in the width direction from the abdominal portion F to the back portion B, and the side flap portions SF of the dorsal portion B are directed rearward. It has a leg periphery edge 10 extending so as to be located on the side, and a waist periphery component region 80 located rearward of the leg periphery edge 10. And the trunk periphery structure area | region 80 of the back part B has the connection tape 13 connected with the outer surface of the abdominal part F so that attachment or detachment is possible. In the mounted state, the connecting tape 13 is connected to the outer surface of the ventral portion F. As shown in FIG. 2 and the like, the side flap portion of the ventral portion F also has a leg periphery 10 that extends to the side as it goes forward, and a waist that is located behind the leg periphery 10. It has a configuration area 80. The leg peripheral edge 10 of the ventral part F and the back part B is continuous, and has a constricted middle in the front-rear direction LD of the tape-type disposable diaper. Moreover, the tape-type disposable diaper of the example of illustration has a pair of end flap part EF which does not have the absorber 56 extended to the front side and back side of the absorber 56, respectively.

Hereinafter, the material and the characteristic part of each part are demonstrated in order.
(Absorber)
The absorber 56 is a part that absorbs and retains excretory fluid, and can be formed of a fiber assembly. As this fiber assembly, a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used. The fiber basis weight can be set to, for example, about 100 to 300 g / m ² when cotton-like pulp or short fibers are stacked, and in the case of a filament aggregate, for example, about 30 to 120 g / m ^2. Can do. The fineness in the case of a synthetic fiber is 1-16 dtex, for example, Preferably it is 1-10 dtex, More preferably, it is 1-5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The degree of crimp of the crimped fibers can be, for example, about 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per 2.54 cm. Moreover, the crimped fiber crimped uniformly can be used.

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or all thereof. Superabsorbent polymer particles include “powder” in addition to “particles”. As the superabsorbent polymer particles 54, those used in this type of absorbent article can be used as they are. The particle size of the superabsorbent polymer particles is not particularly limited, but for example, screening using a standard sieve (JIS Z8801-1: 2006) of 500 μm (shaking for 5 minutes), and particles falling under the screen by this screening When sieving (shaking for 5 minutes) using a 180 μm standard sieve (JIS Z8801-1: 2006), the proportion of particles remaining on the 500 μm standard sieve is 30% by weight or less, and the 180 μm standard sieve It is desirable that the proportion of particles remaining on the surface is 60% by weight or more.

  The material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. High-absorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and sodium carboxymethylcellulose crosslinks. Or an acrylic acid (salt) polymer can be used. As the shape of the superabsorbent polymer particles, a commonly used granular material is suitable, but other shapes can also be used.

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

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

The basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . If the amount of polymer is less than 50 g / m ^2, it is difficult to secure the absorption amount. When it exceeds 350 g / m ² , not only the effect is saturated, but also the sensation of incongruity due to the excess of the superabsorbent polymer particles is given.

(Packaging sheet)
In order to prevent the superabsorbent polymer particles from slipping out or to improve the shape maintaining property of the absorbent body 56, the absorbent body 56 can be incorporated as an absorbent element 50 that is wrapped with a packaging sheet 58. As the packaging sheet 58, tissue paper, particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet having small holes, and the like can be used. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used instead of the crepe paper, a hydrophilic SMMS (spunbond / meltblown / meltblown / spunbond) nonwoven fabric is particularly suitable, and polypropylene, polyethylene / polypropylene, etc. can be used as the material. The fiber basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .

  As shown in FIGS. 3 and 5, the packaging sheet 58 has a structure in which the entire absorbent body 56 is wrapped by one sheet, and the entire absorbent body 56 is wrapped by a plurality of upper and lower sheets. A good packaging sheet 58 can also be omitted.

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

  The top sheet 30 extends from the front end to the rear end of the product in the front-rear direction, and extends laterally from the absorber 56 in the width direction WD. For example, the starting point of a rising gather 60 described later is more than the side edge of the absorber 56. Appropriate modifications such as making the width of the top sheet 30 shorter than the entire width of the absorbent body 56 are possible as necessary, such as when located on the center side in the width direction.

(Intermediate sheet)
An intermediate sheet (also referred to as “second sheet”) 40 having a higher liquid permeation rate than the top sheet 30 can be provided in order to quickly transfer the liquid that has permeated through the top sheet 30 to the absorber. The intermediate sheet 40 is for quickly transferring the liquid to the absorber to enhance the absorption performance by the absorber and preventing the “returning” phenomenon of the absorbed liquid from the absorber. The intermediate sheet 40 can be omitted.

Examples of the intermediate sheet 40 include the same material as the top sheet 30, spunlace nonwoven fabric, spunbond nonwoven fabric, SMS nonwoven fabric, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond nonwoven fabric, or crepe paper. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. Basis weight is preferably ^{17~80g / m 2, 25~60g / m} 2 is more preferable. The thickness of the raw fiber of the nonwoven fabric is preferably 2.0 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use an eccentric fiber, a hollow fiber, or an eccentric and hollow fiber that does not have a core at the center as the mixed fiber of all or part of the raw fiber.

  The intermediate sheet 40 in the illustrated example is disposed in the center shorter than the width of the absorber 56, but may be provided over the entire width. In addition, the intermediate sheet 40 may be provided over the entire length of the diaper, but may be provided only in the intermediate part including the excretion position as illustrated.

(Liquid impervious sheet)
The liquid-impermeable sheet 11 is not particularly limited, but preferably has moisture permeability. As the liquid-impermeable sheet 11, for example, a microporous material obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching in a uniaxial or biaxial direction. A sheet can be suitably used. Moreover, as the liquid-impermeable sheet 11, the thing which improved the waterproofness by using a nonwoven fabric as a base material can also be used.

  The liquid-impermeable sheet 11 desirably extends over the same or a wider range than the absorber 56 in the front-rear direction LD and the width direction WD, but when other water-blocking means is present, A structure in which the end of the absorber 56 is not covered in the front-rear direction LD and the width direction WD may be employed.

(Exterior nonwoven fabric)
The exterior nonwoven fabric 12 covers the entire back side of the liquid-impermeable sheet 11 and makes the outer surface of the product look like a cloth. The exterior nonwoven fabric 12 is not particularly limited, and examples of the material fiber include synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton. As a processing method, a spunlace method, a spunbond method, a thermal bond method, an air-through method, a needle punch method, or the like can be used. However, a long-fiber nonwoven fabric such as a spunbond nonwoven fabric, an SMS nonwoven fabric, or an SMMS nonwoven fabric is preferable in that both the touch and strength can be achieved. In addition to using a single nonwoven fabric, a plurality of nonwoven fabrics can be used. In the latter case, the nonwoven fabrics are preferably bonded to each other with a hot melt adhesive or the like. When using a nonwoven fabric, the fabric weight is preferably 10 to 50 g / m ² , particularly 15 to 30 g / m ² .

(Get up gather)
In order to prevent excrement that travels in the lateral direction along the top sheet 30 and to prevent so-called lateral leakage, rising gathers 60 that rise on the skin side of the wearer are provided on both sides of the surface width direction WD. It is preferable. Of course, the rising gather 60 can be omitted.

  When the rising gather 60 is employed, the structure is not particularly limited, and any known structure can be employed. The rising gather 60 in the illustrated example includes a gather sheet 62 that is substantially continuous in the width direction WD, and an elongated gather elastic member 63 that is fixed to the gather sheet 62 in a stretched state along the front-rear direction LD. ing. As the gather sheet 62, a water-repellent nonwoven fabric can be used, and as the gather elastic member 63, thread rubber or the like can be used. As shown in FIGS. 1 and 2, a plurality of elastic members can be provided, and one elastic member can be provided.

  The inner surface of the gather sheet 62 has a joining start end in the width direction WD on the side portion of the top sheet 30, and a portion on the outer side in the width direction from the joining start end is an inner surface of each side flap portion SF, that is, liquid impermeable in the illustrated example. Bonded to the side portion of the adhesive sheet 11 and the side portion of the exterior nonwoven fabric 12 positioned on the outer side in the width direction by a hot melt adhesive or the like.

  Around the legs, the inner side in the width direction from the joining start end of the gathering 60 is fixed on the top sheet 30 at both ends in the longitudinal direction of the product, but the portion between them is an unfixed free part, and this free part is The elastic member 63 rises due to the contraction force and comes into close contact with the body surface.

(Plane gathering)
A side elastic member 64 made of an elongated elastic member such as a rubber thread is fixed to each side flap portion SF in a state of extending along the front-rear direction LD, and thereby a leg-around portion of each side flap portion SF. Are configured as planar gathers. As shown in the illustrated example, the leg-around elastic member 64 is provided between the gather sheet 62 and the liquid-impermeable sheet 11 on the outer side in the width direction in the vicinity of the joining start end of the joining portion of the gather sheet 62, and also includes a side flap portion. It can also be provided between the liquid-impermeable sheet 11 and the exterior nonwoven fabric 12 in the SF. In addition to providing a plurality of leg-around elastic members 64 on each side as in the illustrated example, only one leg elastic member 64 can be provided on each side.

(Connecting tape)
In the waist circumference region 80 in the back portion B, connecting tapes 13 are provided as connecting means that are detachably connected to the outer surface of the abdominal portion F. When the diaper is mounted, the connecting tape 13 is turned from both sides of the waist to the outer surface of the abdominal portion F, and the connecting portion 13A of the connecting tape 13 is connected to the appropriate position on the outer surface of the abdominal portion F.

  Although the structure of the connecting tape 13 is not particularly limited, in the illustrated example, a tape base portion 13C that is fixed to the waistline constituting region 80, a tape main body portion 13B that protrudes from the tape mounting portion 13C, and this It has a connecting portion 13A for the abdominal side provided at the intermediate portion in the width direction of the tape main body portion 13B in the sheet base material, and the tip side is a knob portion from this connecting portion 13A. The shape of the connecting tape 13 is not particularly limited, but the tape attachment portion 13C has the longest and constant dimension in the front-rear direction, and the tape body portion 13B has a tapered shape that becomes narrower toward the tip. Can do. Moreover, it is preferable that the front-back direction dimension of the tape attachment part 13C is 50 to 90% of the front-back direction dimension of the waist circumference structure area | region 80, and it is preferable that it is longer than the front-back direction dimension Y1 of the three-dimensional deformation | transformation area | region 90 mentioned later.

  As connection part 13A, you may provide an adhesive layer other than providing the hook material (male material) of a mechanical fastener (surface fastener). The hook material has a large number of engaging protrusions on its connecting surface, and the engaging protrusions are (A) letter-shaped, (B) J-shaped, (C) mushroom-shaped, (D) There are T-shape, (E) double J-shape (shape in which J-shape is joined back to back), etc., but any shape may be used.

Moreover, as a sheet | seat base material which forms from 13 C of tape attaching parts to the tape main-body part 13B, although a nonwoven fabric, a plastic film, a polylaminated nonwoven fabric, paper, and these composite materials can be used, the fineness of 1.0-3.5 dtex A spunbonded nonwoven fabric, an air-through nonwoven fabric, or a spunlace nonwoven fabric having a basis weight of 20 to 100 g / m ² and a thickness of 1 mm or less is preferred.

(Target part)
It is preferable to provide a target portion at a connection location of the connection tape 13 in the ventral portion F. A target part can be provided by sticking the target sheet | seat 20 for making a connection easy like the example of illustration to the outer surface of the ventral | abdominal part F. FIG. When the connecting portion 13A is a hook material, the target sheet 20 can be one in which a large number of loop yarns are formed on the surface of a sheet base material made of a plastic film or a nonwoven fabric so that the engagement protrusions of the hook material are entangled. Moreover, in the case of an adhesive material layer, the surface of a sheet substrate made of a plastic film having a smooth surface that is rich in adhesiveness can be used. Moreover, when the connection location of the connection tape 13 in the abdominal part F consists of a nonwoven fabric, for example, when it has the exterior nonwoven fabric 12 like the example of illustration, the target sheet | seat 20 is abbreviate | omitted and a hook material is used for the fiber of the exterior nonwoven fabric 12. It can also be entangled and connected. In this case, in addition to providing the target sheet 20 as a mark between the exterior nonwoven fabric 12 and the liquid impermeable sheet 11, the mark may be printed on the outer surface of the exterior nonwoven fabric 12 or the liquid impermeable sheet 11.

(Waist elastic sheet)
Between at least the left and right connecting tapes 13 in the back side portion B, a waist elastic sheet 70 that elastically expands and contracts in the width direction WD is attached, and a region having the waist elastic sheet 70 elastically expands and contracts in the width direction WD. It is preferable. The waist stretchable sheet 70 may be located only in the end flap portion EF, but when the waist stretchable sheet 70 is disposed so as to extend from the end flap portion EF to the rear end portion of the absorber 56 as illustrated, the absorber 56. This is preferable because the rear end is firmly pressed against the body.

  The waist elastic sheet 70 may use a sheet-like elastic member such as a rubber sheet, but preferably has air permeability. In this case, a sheet-like elastic member having air permeability such as a stretchable nonwoven fabric can be used. However, as shown in FIGS. 5 and 7, two support layers 71 such as a nonwoven fabric are bonded to each other with a hot melt adhesive or the like. It is preferable that the elastic member 72 having a perforated sheet shape, net shape, elongated shape (thread shape or string shape) or the like is fixed in a state of being stretched along the width direction WD. Used for. In this case, as the material of the support layer 71, the same material as the exterior nonwoven fabric 12 can be used. The elongation ratio of the elastic member 72 is preferably about 150 to 250%. Further, when an elongated member (thread-like or string-like) is used as the elastic member 72, it is preferable to provide about 5 to 15 pieces having a thickness of 420 to 1120 dtex at intervals 72d of 3 to 10 mm.

  Although the width | variety of the waist elastic sheet 70 can be defined suitably, it is preferable that it is the width ranging between right and left side flap parts SF like the example of illustration. As specific dimensions, the width of the waist elastic sheet 70 is preferably about 80 to 95% of the total width X of the main body portion excluding the connecting tape 13.

  Both ends of the waist elastic sheet 70 in the width direction WD may be non-expandable regions 76 in order to hold and attach by suction during manufacturing. The size of the non-stretchable region 76 and the size of the intermediate stretchable region 75 that is located between them and stretches in the width direction WD can be determined as appropriate. The width between the connecting portions 13A is preferably 45 to 90%, and the width of the non-stretchable region 76 is preferably about 5 to 50 mm in order to prevent shrinkage or turning-up during manufacturing. The non-stretchable region 76 may be a region that does not have the elastic member 72. However, the non-stretchable region 76 is not stretched by attaching the elastic member 72 over the intermediate stretchable region 75 and the non-stretchable region 76 and cutting the elastic member 72 in the non-stretchable region 76. A structure in which the elastic member 72 remains in the region 76 but hardly or not expands or contracts may be employed.

  In addition, the elastic member 72 may be arranged so that a part of the elastic member 72 crosses the absorber 56. However, as shown in FIG. Therefore, when the elastic member 72 remains, but the structure does not expand or contract at all, the rear end portion of the absorbent body 56 does not contract in the width direction, so that the fit is further improved.

  In the illustrated example, the waist elastic sheet 70 is disposed between the liquid-impermeable sheet 11 and the absorbent element 50, but is not particularly limited to this arrangement. For example, the waist stretchable sheet 70 may be disposed between the liquid-impermeable sheet 11 and the exterior nonwoven fabric 12 or may be provided outside the exterior nonwoven fabric 12. Further, when the exterior nonwoven fabric 12 is formed by stacking a plurality of sheets, the entire waist elastic sheet 70 may be provided between the sheets of the exterior nonwoven fabric 12.

(Three-dimensional deformation region)
Characteristically, as shown in FIGS. 1, 6, and 8, a three-dimensional deformation region 90 that is indented and deformed is provided on the inner side of the connecting tape 13 in the side flap portion of the back portion B in the width direction WD. Yes. That is, in the three-dimensional deformation region 90, an elastic sheet 93 having a size extending inside and outside the three-dimensional deformation region 90, a first cover layer 91 covering the front side of the elastic sheet 93, and a second cover layer 92 covering the back side. It is integrated. That is, in this example, the first cover layer 91 is made of the gather sheet 62 and the second cover layer 92 is made of the exterior nonwoven fabric 12. The first cover layer 91 and the second cover layer 92 are each composed of a single sheet in this example, but may be composed of a plurality of sheets in which at least one is integrated. In addition, it goes without saying that the materials to be the first cover layer 91 and the second cover layer 92 are different from those of the present example in accordance with the formation site of the three-dimensional deformation region 90. Furthermore, as long as the 1st cover layer 91 and the 2nd cover layer 92 do not have a stretching property, what has a stretching property may be contained in the sheet | seat contained there, but both sides are formed with a nonwoven fabric It is preferable that Note that the term “not having stretchability (non-stretching)” means that the stretching magnification at the elastic limit is 1.0 to 1.3 times in all directions orthogonal to the thickness direction.

  The elastic sheet 93 is not particularly limited, and may be an elastic (elastic) film or a stretchable nonwoven fabric as long as the sheet itself has elasticity. Moreover, as the elastic sheet 93, in addition to a non-porous sheet, a sheet in which a large number of holes and slits are formed for ventilation can be used. The elastic sheet 93 is not limited by the characteristics. For example, the tensile strength in the width direction WD (stretch direction ED, MD direction) is 8 to 25 N / 35 mm, and the front-rear direction LD (direction XD, CD orthogonal to the stretch direction) The elastic sheet 93 having a tensile strength in the direction of 5 to 20 N / 35 mm, a tensile elongation in the width direction WD of 450 to 1050%, and a tensile elongation in the front-and-rear direction LD of 450 to 1400% can be used. Although the thickness of the elastic sheet 93 is not specifically limited, For example, it can be set as about 20-40 micrometers.

  The first cover layer 91 and the elastic sheet 93, and the second cover layer 92 and the elastic sheet 93 can be integrated by adhering via a hot melt adhesive, or by at least one welding. In addition, the first cover layer 91, the elastic sheet 93, and the second cover layer 92 are intermittently joined even if the entire adjacent layers are continuously joined as long as they can be expanded and contracted integrally. Also good. Moreover, in the state which employ | adopted the integration method shown by the special table | surface 2004-532758 gazette and Unexamined-Japanese-Patent No. 2014-189826, the elastic sheet 93 was pinched | interposed between the 1st cover layer 91 and the 2nd cover layer 92. The first cover layer 91 and the second cover layer 92 may be joined through through holes formed in the elastic sheet 93 at a large number of joining portions by performing ultrasonic sealing in the form of scattered dots (not shown).

  Also, characteristically, the first cover layer 91 and the second cover layer 92 in the three-dimensional deformation region 90 are provided with a plurality of slits 95 and 96 made of slits or perforations for forming the slits. Yes. These slit portions 95 and 96 extend from one edge of the three-dimensional deformation region 90 to the other edge across the three-dimensional deformation region 90 and intersect each other. All of the portions of the first cover layer 91 and the second cover layer 92 located in the three-dimensional deformation region 90 are continuous with the portions located outside the three-dimensional deformation region 90 without the slits 95 and 96 being interposed. is doing. As a result, in the three-dimensional deformation region 90 of the present example, the first cover layer 91 in which the plurality of slit portions expands as they approach the intersecting positions, as in the example illustrated in FIGS. 6B and 10. With the deformation of the second cover layer 92, the elastic sheet 93 can be elastically stretched according to the spread of the slit portions 95 and 96.

  In other words, in the three-dimensional deformation area 90, when a force from one side in the thickness direction to the other side is applied to the three-dimensional deformation area 90 as indicated by an arrow in FIG. Following this, it can be deformed so as to be recessed with respect to the surrounding portion while extending mainly in a plurality of directions orthogonal to the slit portions 95 and 96. Therefore, if such a three-dimensional deformation region 90 that deforms into a depression is provided at a position in contact with the local three-dimensional convex portion on the body surface, the fitting property to the convex portion and the surrounding portion is excellent. In addition, since the three-dimensional deformation region 90 is determined by the plurality of slit portions 95, 96, there is no restriction in the expansion / contraction direction and the degree of expansion / contraction is large compared to the conventional example based on a single linear slit. It can be. Further, all of the portions of the first cover layer 91 and the second cover layer 92 located in the three-dimensional deformation region 90 are continuous with the portions located outside the three-dimensional deformation region 90 without the slits 95 and 96 being interposed. Therefore, it is possible to manufacture the existing cover by simply providing the slit portions 95 and 96 in the first cover layer 91 and the second cover layer 92 in existing manufacturing equipment.

  The stretchable structure by the slit portions 95 and 96 may be attached in a state where the elastic sheet 93 is stretched at the time of manufacture. In that case, as the elastic sheet 93 contracts to the natural length, the three-dimensional deformation region 90 contracts the first cover layer 91 and the second cover layer 92 to the first cover layer 91 and the second cover layer 92. Shrink folds are formed. Unlike this, the elastic sheet 93 can be integrated with the first cover layer 91 and the second cover layer 92 in a state where the elastic sheet 93 is not substantially stretched at the time of manufacture. The illustrated example assumes this case, and in the natural length state, no wrinkles (including wrinkles) are formed in the three-dimensional deformation region 90, and the appearance is good. In particular, since only the slit portions 95 and 96 are provided in the first cover layer 91 and the second cover layer 92, the elastic sheet 93 is clearly hidden by the first cover layer 91 and the second cover layer 92 in the natural length state. There is also an advantage of being.

  The slit portions 95 and 96 may extend not only in the front-rear direction LD and the width direction WD but also in an oblique direction. As long as the slits 95 and 96 extend to the edge across the three-dimensional deformation region 90, the slits 95 and 96 can be in a straight line shape as in the illustrated example, or in a curved shape such as an arc shape or a wavy line. The intersecting angle between the two slit portions 95 and 96 intersecting each other can be determined as appropriate depending on the size and shape of the three-dimensional deformation region 90 and the arrangement of the slit portions 95 and 96. When one side is an acute angle, the angle can be 15 degrees or more and less than 90 degrees, particularly 30 degrees or more and less than 90 degrees. The dimensions of the three-dimensional deformation region 90 can be determined as appropriate, but in the normal case, the front-rear direction dimension Y1 can be in the range of about 2 to 7 mm, and the width direction dimension X1 can be in the range of about 4 to 7 mm. As shown in FIG. 9A, the front-rear dimension Y1 is longer than the width dimension X1, or as shown in FIG. 9B, the width dimension X1 is longer than the front-rear dimension Y1. The direction dimension Y1 and the width direction dimension X1 can be made the same. The three-dimensional deformation region 90 preferably does not include the end portion of the article at the periphery, but may include a part thereof. The number of the slit portions 95 and 96 is not limited and may be larger than the illustrated example.

  The arrangement of the plurality of slit portions 95 and 96 is not particularly limited. For example, as in the examples shown in FIG. 8, some of the plurality of slits 95 (example in FIG. 8A) or all (slits 95 in FIGS. 8B and 8C) are three-dimensionally deformed. It is preferable that both ends extend through the center of the region 90 to the edge of the three-dimensional deformation region 90. In this case, the slit portion 95 is radial (X-shaped or cross-shaped) from the center of the three-dimensional deformation region 90. In this way, when the slit portions 95 are arranged so as to extend radially from the central portion of the three-dimensional deformation region 90, a wide range of three-dimensional deformation is achieved with the minimum number of slit portions 95. The region 90 can be formed, and the arrangement of the slits 95 is suitable when the three-dimensional deformation region 90 is circular, elliptical, or rhombus.

  As shown in the example shown in FIG. 8A, the slit portions 95 and 96 pass through the central portion of the three-dimensional deformation region 90, and the central slit portion 95 whose both ends extend to the edge of the three-dimensional deformation region 90. It is also preferable that both end portions include end slit portions 96 that extend through the end portions of the central slit portion and extend to the edge portions of the three-dimensional deformation region 90. In this case, the slit portions 95 and 96 extend in a T shape, an H shape, or the like. The arrangement of the slit portions 95 and 96 is suitable when the three-dimensional deformation region 90 is a triangle or a rectangle. As shown in FIG. 8D, only three or two end slit portions 96 may be provided so as to surround the three-dimensional deformation region 90 in a U shape or a V shape.

  The slit portions 95 and 96 of the first cover layer 91 and the slit portions 95 and 96 of the second cover layer 92 have the same dimensions and shape and are disposed at the same position (that is, completely overlap in the thickness direction). Although desirable, it may be slightly deviated. Further, the slit portions 95 and 96 of the first cover layer 91 and the slit portions 95 and 96 of the second cover layer 92 may have different sizes and shapes.

  In the tape type disposable diaper having the side flap portion SF as in this example, the target portion (in the width direction WD inside the connecting tape 13 in the side flap portion SF of the back portion B or the side flap portion SF of the ventral portion F ( In the illustrated example, the portion outside the target sheet 20) in the width direction WD is a portion in contact with a local three-dimensional convex portion of the body surface such as the iliac crest and the superior anterior iliac spine. Therefore, as shown in FIG. 9A, it is also possible to provide a three-dimensional deformation region 90 having the aforementioned slit portions 95 and 96 at both of these portions. Of course, it may be provided only at one of these sites. Moreover, it is also preferable to provide in the end flap part EF of the back part B like the example shown in FIG.9 (b).

  Moreover, when attaching the waist elastic sheet 70 to the back part B like the example of illustration and improving the fit property around a waist, it is difficult to provide the waist elastic sheet 70 to the vicinity of the connection tape 13 in many cases. This is because most of the tape-type disposable diapers are manufactured so that the longitudinal direction LD of the product coincides with the MD direction (machine direction) in the production line, or the waist elastic sheet 70 is extended in the width direction WD. This is due to the necessity of mounting in a state. However, the part between this waist elastic sheet 70 and the connection tape 13 is located in the side flap part SF, and becomes a part in contact with the iliac crest as described above. Therefore, it is preferable to provide the three-dimensional deformation region 90 having the slit portions 95 and 96 described above at this portion. The three-dimensional deformation region 90 having the above-described slit portions 95 and 96 is simply provided with slit portions 95 and 96 in the first cover body and the second cover body in advance, and the elastic sheet 93 is disposed in a substantially non-extended state. Therefore, it is possible to form the three-dimensional deformation region 90 at a position that is difficult to form.

<Others>
Although the three-dimensional deformation | transformation area | region 90 which has the slit parts 95 and 96 in the said example is provided in the side flap part SF of a tape type disposable diaper, it is also possible to provide in another site | part and another kind of product. For example, although not shown, the three-dimensional deformation region 90 having the slit portions 95 and 96 described above can be provided on the connecting tape 13 of the tape-type disposable diaper, or around the trunk of the pant-type disposable diaper.

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.
"The front-rear direction" means the direction (vertical direction) indicated by the symbol LD in the figure, and "width direction" means the direction indicated by WD (left-right direction) in the figure, Are orthogonal.

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

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

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

・ "Weight" is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 23 ± 1 ° C., relative humidity 50 ± 2%) to a constant weight. Pre-drying refers to making a sample or test piece constant in an environment at a temperature of 100 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%. From the test piece in a constant weight state, a sample plate (100 mm × 100 mm) is used to cut a sample having a size of 100 mm × 100 mm. The weight of the sample is measured, multiplied by 100, and the weight per square meter is calculated and used as the basis weight.
・ "Thickness" of the absorber is a thickness measuring instrument (Peacock, dial thickness gauge large type, model JB (measurement range 0 to 35 mm) or model K-4 (measurement range 0 to 50 mm)) manufactured by Ozaki Mfg. Co., Ltd. Measure the sample and the thickness meter horizontally.
-"Thickness" other than the above is automatically measured using an automatic thickness measuring instrument (KES-G5 handy compression measurement program) under the conditions of load: 0.098 N / cm ² and pressure area: 2 cm ² .
・ "Tensile strength" and "tensile elongation (breaking elongation)" are in accordance with JIS K7127: 1999 "Plastics-Test method for tensile properties-" except that the test piece is rectangular with a width of 35 mm and a length of 80 mm. The initial chuck interval (distance between marked lines) is 50 mm, and the tensile speed is 300 mm / min. As the tensile tester, for example, AUTOGRAPH AGS-G100N manufactured by SHIMADZU can be used.

  -"Water absorption" is measured by JIS K7223-1996 "Test method for water absorption of superabsorbent resin".

  ・ "Water absorption rate" is "Time to end point" when JIS K7224-1996 "Water absorption rate test method for superabsorbent resin" is performed using 2 g of superabsorbent polymer and 50 g of physiological saline. And

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

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

  INDUSTRIAL APPLICABILITY The present invention is used for a stretchable structure in general disposable wear articles such as various disposable diapers such as pants and pad types, sanitary napkins, disposable wear articles for swimming and water play, etc. in addition to tape type disposable diapers as in the above examples. It can be done.

  DESCRIPTION OF SYMBOLS 10 ... Edge around leg, 11 ... Liquid impervious sheet, 12 ... Exterior nonwoven fabric, 13 ... Connection tape, 13A ... Connection part, 13B ... Tape body part, 13C ... Tape attachment part, 20 ... Target sheet, 30 ... Top sheet 40 ... Intermediate sheet, 50 ... absorbing element, 56 ... absorber, 58 ... packaging sheet, 60 ... gather gather, 62 ... gather sheet, B ... back portion, F ... ventral portion, WD ... width direction, LD ... Front-rear direction, 70 ... waist elastic sheet, 80 ... waist circumference configuration area, 90 ... three-dimensional deformation area, 93 ... elastic sheet, 91 ... first cover layer, 92 ... second cover layer, 95, 96 ... slit part, 95 ... central slit part, 96 ... end slit part, SF ... side flap part.

Claims (6)

An elastic sheet, a first cover layer covering the front side of the elastic sheet, and a second cover layer covering the back side of the elastic sheet are integrated,
The first cover layer and the second cover layer do not have elasticity,
A three-dimensional deformation region in a region where the first cover layer, the second cover layer and the elastic sheet overlap;
The first cover layer and the second cover layer in the three-dimensional deformation region are provided with a plurality of slit portions made of slits or perforations for forming the slit,
The plurality of slit portions extend from one edge of the three-dimensional deformation region to the other edge across the three-dimensional deformation region,
The plurality of slit portions intersect each other,
All of the portions located in the three-dimensional deformation region in the first cover layer and the second cover layer are continuous to the portion located outside the three-dimensional deformation region without passing through the slit portion.
An elastic structure of an absorbent article characterized by the above. In the three-dimensional deformation region, in a natural length state, a shrinkage wrinkle formed with the shrinkage of the elastic sheet is not formed in the first cover layer and the second cover layer.
The elastic structure of the absorbent article according to claim 1. The slit portion includes a plurality of slit portions that pass through a central portion of the three-dimensional deformation region and both end portions extend to an edge of the three-dimensional deformation region.
The elastic structure of the absorbent article according to claim 1. The slit portion passes through a central portion of the three-dimensional deformation region, both end portions extend to the edge of the three-dimensional deformation region, and both ends pass through the end portion of the central slit portion. Including an end slit extending to the edge of the deformation region,
The elastic structure of the absorbent article according to any one of claims 1 to 3. The absorbent article is
Having a crotch portion including a front-rear direction center, a ventral portion extending frontward from the front-rear direction center, and a dorsal side portion extending rearward from the front-rear direction center,
Having an absorbent body built in a range including the crotch part,
The ventral part and the dorsal part have side flaps that extend to the left and right sides of the absorber,
A connecting means for detachably connecting the back side portion and the abdominal side portion to the side flap portion of the back side portion;
On the outer surface of the ventral portion, the target means is connected to the connecting means,
It is a tape type disposable diaper,
At least one of the widthwise inner side of the connecting means in the side flap portion of the back portion and the outer side of the target portion of the side flap portion of the ventral portion has the three-dimensional deformation region.
The stretchable structure of the absorbent article according to any one of claims 1 to 4. A waist elastic sheet that elastically expands and contracts in the width direction is attached to the back side part over at least the left and right side flap parts,
The region having the waist stretchable sheet is elastically stretchable in the width direction together with the waist stretchable sheet,
Between the waist elastic sheet and the connecting means, the three-dimensional deformation region,
The elastic structure of the absorbent article according to claim 5.

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