JP2016174816A - Tape type disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve fittability of a back-side part by a simple configuration.SOLUTION: Waist-side areas of width-direction intermediate parts or width-directional whole parts in both of a dorsal part B and a ventral part F are defined as inner/outer independent stretchable areas 20 including: an outer stretchable part 70; and an inner stretchable part 80 that is superposed on the inside of the outer stretchable part 70 and configured not to be bonded to the inner face of the outer stretchable part 70. Each of the outer stretchable part 70 and the inner stretchable part 80 includes waist elastic stretchable members 92 that are fitted between a pair of sheet layers 91 in a plurality of superposed sheet layers, with their extended in the width direction. Further contraction creases are formed on the outer/inner stretchable parts by contraction of the sheet layers 91 along with the waist elastic stretchable members 92.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a tape-type disposable diaper.

  A general tape-type disposable diaper projects from the crotch part, the abdominal part extending to the front side of the crotch part, the back side part extending to the rear side of the crotch part, and both sides of the back side part. It has a fastening tape and a target tape that is located on the outer surface of the abdomen and to which the fastening tape is connected. When wearing it on the body, turn the fastening tape from both sides of the waist to the outer surface of the abdomen. It has a structure connected to the tape. Such a tape-type disposable diaper is used not only for infants but also widely used for nursing care (adult use).

  In general, tape-type disposable diapers are inferior in fit in the waistline direction compared to pants-type disposable diapers, and elastically stretch along the width direction on the waist side of the dorsal part to improve leakage from the waist. It has been proposed to provide a member (for example, see Patent Document 1) or to provide a member that elastically expands and contracts on the fastening tape.

  However, the back (waist) of the wearer is a portion that has been lowered from the swelling of the buttocks, and the center side is usually recessed rather than the left and right sides, so there is room for improvement in fit. In addition, there is room for improvement in fit because the abdomen of the wearer has large changes in bulge before and after breathing and eating.

JP 2000-342626 A JP-A-2005-152168

  Therefore, the main problem of the present invention is to improve the fit around the trunk with a simple structure.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
An absorber arranged from the ventral part to the dorsal part;
In a tape-type disposable diaper provided with a fastening tape provided on both sides of the back side part and fastened to the outer surface of the abdominal side part,
At least one of the back side portion and the abdominal side portion has a width direction intermediate or entire width direction waist region overlapping the outer stretchable portion and the inside of the outer stretchable portion, and not joined to the inner surface of the outer stretchable portion. It is considered as an internal / external independent expansion / contraction region having an internal expansion / contraction portion.
Each of the outer stretchable portion and the inner stretchable portion has a plurality of laminated sheet layers, and a waist elastic stretchable member attached in a state of extending in the width direction between the pair of sheet layers, and the waist It is a part where shrinkage wrinkles are formed due to shrinkage of the sheet layer with an elastic elastic member,
A tape-type disposable diaper characterized by that.

(Function and effect)
The present invention is characterized in that the waist side region in the middle in the width direction or the entire width direction has a two-layer structure in which the outer stretchable portion and the inner stretchable portion are not joined to each other, and an inner and outer independent stretchable region in which a shrinkage fold is formed respectively. Have. Such an inner / outer independent stretchable region has a significant increase in thickness as compared with the case where the number of layers is simply increased, and is rich in compressibility in the thickness direction. And since the inner and outer independent stretchable regions are also elastically stretched in the direction of the waist by the outer stretchable portion and the inner stretchable portion, the thick and highly compressible portion is pressed against the wearer's torso, As a result, it is excellent in the fit with respect to the recessed part around a wearer's trunk | drum, although it is a simple structure.
In addition, in the inner and outer independent stretch regions, the gap between the outer stretch portion and the inner stretch portion opens to the edge of the waist, so a padding is put between the outer stretch portion and the inner stretch portion from the opening, It is also possible to further improve the fit to the recess. At this time, since the outer stretchable portion and the inner stretchable portion are elastically stretched, there is also an advantage that the padding put between the outer stretchable portion and the inner stretchable portion is difficult to come out.

<Invention of Claim 2>
The tape-type disposable diaper according to claim 1, wherein an elongation rate at the time of attaching the waist elastic stretchable member in the inner stretchable portion is higher than an elongation rate at the time of attaching the waist elastic stretchable member in the outer stretchable portion.

(Function and effect)
When the elongation rate of the inner stretchable portion is made higher than the stretch rate of the outer stretchable portion in this way, the inner and outer independent stretchable regions are curved along the trunk due to the difference in shrinkage between the inside and outside, so that the fit around the trunk is further improved.

<Invention of Claim 3>
The waist side region of the width direction middle or the entire width direction in both the back side portion and the ventral side portion is the inside / outside independent stretch region,
Either one of the dorsal part and the ventral part has an inner part extending from the waist side edge toward the crotch side, and an outer side folded back to the waist side edge at the crotch side edge. A folded elastic elastic band having a part is attached in a state of extending in the width direction,
The inner part and the outer part of the folded elastic elastic band are not joined to each other, the inner part of the folded elastic elastic band is the inner elastic part, and the outer part of the folded elastic elastic band is the outer elastic part. Each is composed
An inner elastic stretch band and a separate outer elastic stretch band that extend from the waist side edge toward the crotch side extend in the width direction on either the back side portion or the ventral side portion. It is attached in the state,
The inner elastic elastic band and the outer elastic elastic band are not joined to each other, the inner elastic elastic band constitutes the inner elastic part, and the outer elastic elastic band constitutes the outer elastic part,
The folded elastic elastic band, the inner elastic elastic band and the outer elastic elastic band have the same width, and a plurality of elongated waist elastic elastic members are spaced in the front-rear direction between a pair of sheet materials, and each has a width direction. It is attached in a stretched state,
The tape-type disposable diaper according to claim 1 or 2.

(Function and effect)
With such a structure, it is possible to provide an outer stretchable portion and an inner stretchable portion on both the back side portion and the ventral side portion with a minimum number of steps in addition to the manufacturing form of a general tape type disposable diaper. That is, in a general tape-type disposable diaper manufacturing form, after laminating and assembling members in a state where the individual diaper parts are continuous in the front-rear direction, the individual diaper parts are cut and separated at the boundaries of the individual diaper parts. Forming a diaper. At this time, separately manufactured elastic stretch bands for both the front and rear attached in a state where a plurality of elongated waist elastic elastic members are spaced in the front-rear direction and extended in the width direction between the pair of sheet materials, When this is folded in half and attached so as to straddle the boundaries of the individual diaper parts, it is possible to produce a tape-type disposable diaper with the structure described in this section simply by cutting it into the individual diapers thereafter. it can.

<Invention of Claim 4>
The inner and outer independent stretch regions are extended to a position overlapping the waist side end of the absorber in the front-rear direction,
The waist elastic expansion / contraction member is not provided in a portion overlapping the waist side end portion of the absorber among the outer expansion / contraction portion and the inner expansion / contraction portion,
The tape type disposable diaper of any one of Claims 1-3.

(Function and effect)
Since the absorbent body is a thick member in the disposable diaper, if the thickness of the portion overlapping the absorbent body increases too much, the step may lead to a sense of incongruity when worn. On the other hand, as described above, when the elastic elastic member is not provided in the portion of the outer elastic portion and the inner elastic portion that overlaps the waist side end of the absorber, the outer elastic portion and the inner elastic portion Since the increase in thickness due to shrinkage wrinkles in the portion not having the elastic waist elastic member is less than that in the portion having the elastic waist elastic member, the increase in the thickness of the portion overlapping the absorbent body is small, and it is difficult to cause discomfort during wearing. It will be a thing.

<Invention of Claim 5>
The waist elastic expansion / contraction member is not provided in the crotch part in the inner expansion / contraction portion, and the waist elastic expansion / contraction member is provided over the entire front / rear direction in the outer expansion / contraction portion. The tape type disposable diaper of any one of Claims.

(Function and effect)
Since the outer stretchable portion and the inner stretchable portion have less thickness increase due to the shrinkage wrinkles in the portion not having the waist elastic stretchable member than the portion having the waist elastic stretchable member, as described in this section, If the elastic elastic member is not provided on the part, and the elastic elastic member is provided on the outer elastic part over the entire front-rear direction, the thickness increases toward the waist side. The fitting property is further improved, and the damming action of the liquid trying to leak through the surface is also improved.

  As described above, according to the present invention, there are advantages such as an improved fit of the back portion while having a simple structure.

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. FIG. 5 is a sectional view taken along line 5-5 of FIG. It is a top view which expands and shows a principal part It is an exploded view of the principal part. (A) 8-8 sectional view taken on the line of FIG. 1, (b) 4-4 sectional view taken on the line of FIG. (A) 9-9 sectional view taken on the line of FIG. 1, (b) 3-3 sectional view taken on the line of FIG. It is a top view of the expansion | deployment state of an elastic elastic band. (A) (b) is sectional drawing equivalent to the 8-8 line cross section of FIG. (A) (b) is sectional drawing equivalent to the 8-8 line cross section of FIG. FIG. 8 is a cross-sectional view corresponding to a cross section taken along line 8-8 in FIG. 1. It is a photograph of a sample.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIGS. 1-10 has shown an example of the tape type disposable diaper, the code | symbol X in the figure has shown the full width of the diaper except a fastening tape, the code | symbol L has shown the full length of the diaper, and it is in sectional drawing. The dot pattern portion indicates an adhesive as a joining means for joining the constituent members located on the front side and the back side, and is applied with a solid, bead, curtain, summit or spiral coating of hot melt adhesive, or a pattern coat (letter plate system) The fixing portion of the elastic stretchable member is formed by coating on the outer peripheral surface of the elastic stretchable member such as a comb gun or a sheath coating instead of or together with this. . 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 is a portion that extends from the lower abdomen along the center in the width direction through the crotch to cover the buttocks, and a liquid-permeable top sheet that forms the body side surface, and the outer surface side The main body 10 which is a portion where the absorber 56 is interposed between the liquid-impermeable sheet positioned in the portion and a portion which extends to the front side and the rear side of the absorber 56 (a portion which does not have the absorber 56) And a ventral end flap portion EF and a dorsal end flap portion EF.

  Further, this tape-type disposable diaper has a pair of side flap portions SF, SF extending laterally from the side edge of the absorber 56, and the side flap portions SF, SF in the back side portion B include Fastening tapes 13 are respectively provided.

  More specifically, the entire outer surface of the main body portion 10 and the side flap portions SF, SF is formed by the exterior sheet 12. In particular, in the main body 10, the liquid-impermeable sheet 11 is fixed to the inner surface side of the exterior sheet 12 by an adhesive such as a hot melt adhesive, and the absorbent element 50 is further disposed on the inner surface side of the liquid-impermeable sheet 11. The intermediate sheet 40 and the top sheet 30 are laminated in this order. The top sheet 30 and the liquid-impermeable sheet 11 are rectangular in the illustrated example, have slightly larger dimensions in the front-rear direction and the width direction than the absorbent body 56, and are eaten from the side edges of the absorbent body 56 in the top sheet 30. The peripheral edge that protrudes and the peripheral edge that protrudes from the side edge of the absorber 56 in the liquid-impermeable sheet 11 are fixed by a hot melt adhesive or the like. The liquid-impermeable sheet 11 is made of a moisture-permeable polyethylene film or the like and is formed to be slightly wider than the top sheet 30.

  Further, on both sides of the main body 10, side solid gathers 60, 60 that protrude (stand up) toward the wearer's skin are provided, and gather sheets 62 that form the side solid gathers 60, 60. 62 is fixed in a range from the both side portions of the top sheet 30 to the inner surfaces of the side flap portions SF and SF.

Hereinafter, the material and the characteristic part of each part are demonstrated in order.
(Exterior sheet)
The exterior sheet 12 is a part that supports the absorbent element 50 and is attached to the wearer. The exterior sheet 12 has an hourglass shape in which the center part in the front-rear direction on both sides is constricted, and this is a part that surrounds the wearer's leg.

The exterior sheet 12 is preferably a non-woven fabric, but is not limited thereto. The type of the nonwoven fabric is not particularly limited, and as the material fiber, for example, synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester or polyamide, recycled fibers such as rayon or cupra, and natural fibers such as cotton are used. 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 .

  The exterior sheet 12 can be omitted.

(Liquid impervious sheet)
The material of the liquid-impermeable sheet 11 is not particularly limited. For example, the liquid-impermeable sheet 11 is substantially made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet, or a waterproof film. Non-woven fabrics that ensure liquid impermeability (in this case, liquid impervious sheets are composed of waterproof films and non-woven fabrics). Of course, in addition to this, a liquid-impermeable and moisture-permeable material that has been used and used in recent years from the viewpoint of preventing stuffiness can also be exemplified. As the sheet of the material having liquid impermeability and moisture permeability, for example, an inorganic filler is kneaded in an olefin resin such as polyethylene or polypropylene, and the sheet is formed, and then stretched in a uniaxial or biaxial direction. Examples of the microporous sheet obtained in this way can be given. In addition, non-woven fabric using micro-denier fiber, strengthening leakage resistance by reducing the voids of the fiber by applying heat or pressure, and applying water-repellent resin or hydrophobic resin or water repellent to waterproof A sheet that is liquid-impermeable without using a film can also be used as the liquid-impermeable sheet 11.

  When the exterior sheet 12 is omitted, the liquid-impermeable sheet 11 forms the outer surface of the product, and when the exterior sheet 12 is provided, the width can be narrower than the width of the exterior sheet 12. In the case where the sheet 12 is not provided, the sheet is generally expanded to the product width.

(Top sheet)
The top sheet 30 is sufficient if it 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 may be composed of a single sheet or a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.

(Intermediate sheet)
An intermediate sheet (also referred to as a second sheet) 40 can be provided between the top sheet 30 and the absorbent element 50 in order to move excrement that has passed through the top sheet 30 to the absorbent body and prevent reversal. This intermediate sheet 40 not only improves the absorption performance by the absorber by quickly transferring the excrement to the absorber, but also prevents the excretion of the absorbed excrement from returning from the absorber, making the top sheet 30 surface feel better To do. The intermediate sheet 40 can be omitted.

  As the intermediate sheet 40, the same material as the top sheet 30 can be used. The intermediate sheet 40 is preferably bonded to the top sheet 30. When heat embossing or ultrasonic welding is used for the bonding, the material of the intermediate sheet 40 preferably has the same melting point as the top sheet 30. When a non-woven fabric is used for the intermediate sheet 40, the fineness of the non-woven fabric fiber is preferably about 2.0 to 5.0 dtex.

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

(Side three-dimensional gather)
In order to prevent urine and soft stools that move laterally on the top sheet 30 and prevent side leakage, side solid gathers 60 that protrude (stand up) on the use surface side are provided on both sides of the product. preferable.

  The side three-dimensional gather 60 includes a gather sheet 62 that is substantially continuous in the width direction, and an elongated elastic elastic member 63 that is fixed to the gather sheet 62 in a stretched state along the front-rear direction. As the gather sheet 62, a water-repellent nonwoven fabric can be used, and as the elastic elastic member 63, rubber thread or the like can be used. As shown in FIGS. 1 and 2, a plurality of elastic elastic members can be provided in addition to a plurality of elastic expansion members.

  The inner surface of the gather sheet 62 has a fixing start end in the width direction on the side portion of the top sheet 30, and a portion on the outer side in the width direction from the fixing start end is on the side portion of the liquid-impermeable sheet 11 and the outer side in the width direction. It fixes to the side part of the exterior sheet | seat 12 located with the hot-melt-adhesive agent etc.

  Around the legs, the width direction inner side from the fixing start end of the side three-dimensional gather 60 is fixed on the top sheet 30 at both ends in the product front-rear direction, but the portion between them is an unfixed free part. The portion comes to stand by the contraction force of the elastic elastic member 63. When the diaper is mounted, the diaper is mounted on the body in the shape of a boat, and the contraction force of the elastic expansion / contraction member 63 acts. In close contact. As a result, so-called side leakage from around the legs is prevented.

  Unlike the illustrated embodiment, the front and rear direction end portions of the gather sheet 62 on the inner side in the width direction are divided into a base end side portion extending inward in the width direction from an outer portion in the width direction and a center side in the width direction of the base end side portion. It is also possible to fix in a double-folded state having a distal end side portion that is folded back from the edge toward the body side and extends outward in the width direction, and the portion in between can be an unfixed free portion.

(Plane gathering)
Each side flap portion SF, SF has a leg elastic made of thread rubber or the like between the gather sheet 62 and the liquid-impermeable sheet 11 on the outer side in the width direction in the vicinity of the fixing start of the fixing portions of the gather sheet 62. The stretchable member 64 is fixed in a state of being stretched along the front-rear direction, whereby the leg-around portions of the side flap portions SF, SF are configured as a planar gather. The leg elastic member 64 may be disposed between the liquid-impermeable sheet 11 and the exterior sheet 12 in the side flap portion SF. In addition to providing a plurality of leg elastic members 64 on each side as shown in the drawing, only one elastic member 64 can be provided on each side.

(Absorption element)
The absorption element 50 is a part that absorbs and holds liquid such as urine and loose stool. The absorbent element 50 includes an absorbent body 56 and a packaging sheet 58 that wraps at least the back and side surfaces of the absorbent body 56. The packaging sheet 58 can be omitted. The absorbent element 50 can be adhered to the inner surface of the liquid-impermeable sheet 11 via an adhesive such as a hot melt adhesive on the back surface.

(Absorber)
The absorber 56 can be formed of an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used. 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 crimped degree of the crimped fiber can be, for example, 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used.

(Superabsorbent polymer particles)
The absorbent body 56 preferably includes superabsorbent polymer particles. In particular, at least in the liquid receiving region, the superabsorbent polymer particles (SAP particles) are dispersed substantially throughout the thickness direction with respect to the aggregate of fibers. Is desirable.

  If there is no SAP particle in the upper part, the lower part, and the middle part of the absorber 56, or if there is very little, it cannot be said that the "absorbed throughout the thickness direction". Therefore, “distributed in the entire thickness direction” means “distributed unevenly in the upper part, the lower part, and / or the middle part of the aggregate of fibers in addition to the form“ uniformly ”distributed in the entire thickness direction. However, it is still included in the form of being dispersed in the upper, lower and middle portions. Further, a form in which some SAP particles do not enter the fiber assembly and remain on the surface thereof, and a form in which some SAP particles pass through the fiber assembly and are on the packaging sheet 58 are also excluded. It is not something.

  Superabsorbent polymer particles include “powder” in addition to “particles”. As the particle diameter of the superabsorbent polymer particles, those used in this type of absorbent article can be used as they are, and those having a particle size of 1000 μm or less, particularly 150 to 400 μm are desirable. 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.

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)
When the packaging sheet 58 is used, as the material, tissue paper, particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet with small holes, or the like can be used. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used in place of the crepe paper, a hydrophilic 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 FIG. 3, the packaging sheet 58 may wrap only the back surface and the side surface of the layer in addition to the form for wrapping the entire absorbent body 56. Although not shown, only the upper and side surfaces of the absorbent body 56 are covered with crepe paper or a nonwoven fabric, and the lower surface is covered with a liquid-impermeable sheet such as polyethylene, and the upper surface of the absorbent body 56 is covered with crepe paper or a nonwoven fabric. For example, the lower surface may be covered with a liquid-impermeable sheet such as polyethylene (each of these materials is a component of the packaging sheet). If necessary, the absorbent body 56 may be sandwiched between two upper and lower sheets or disposed only on the lower surface, but this is not desirable because it is difficult to prevent the movement of the superabsorbent polymer particles.

(Fastening tape)
As shown in FIGS. 1, 2, and 5, the fastening tape 13 includes a sheet base material that forms a tape attachment portion 13 </ b> C fixed to a side portion of the diaper and a tape main body portion 13 </ b> B protruding from the tape attachment portion 13 </ b> C. And a locking portion 13A for the abdomen side portion 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 from the locking portion 13A is a knob. . The tape attachment portion 13C of the fastening tape 13 is sandwiched between the gather sheet 62 forming the inner layer and the exterior sheet 12 forming the outer layer in the side flap portion, and is bonded to both the sheets 62 and 12 by a hot melt adhesive. . Moreover, 13 A of latching parts are joined to the sheet | seat base material with the adhesive agent so that peeling is impossible.

  In the baby diaper, among the dimensions of the tape attachment portion 13C, the length X1 of the diaper in the width direction is preferably 10 to 50 mm, particularly 20 to 40 mm, and the length Y1 in the front-rear direction is 20 to 100 mm, particularly It is preferable that it is 40-80 mm. Of the dimensions of the tape body 13B, the length of the diaper in the width direction is preferably 30 to 80 mm, particularly 40 to 60 mm, and the length (height) in the front-rear direction is 20 to 70 mm, particularly 25 to 25 mm. 50 mm is preferred. In addition, when a part or all of the fastening tape 13 is substantially tapered, for example, and the length in the front-rear direction and the length in the width direction are not constant, the numerical range is determined by an average value. The fastening tape 13 may have a symmetrical shape such as a rectangular shape. However, if the fastening tape 13 is a convex shape composed of a wide attachment portion and an elongated tip side portion, the grip portion on the tip side portion can be easily picked and This is preferable because the tension between the bases of this region acts over a wide range.

  As the locking portion 13A, a hook material (male material) of a mechanical fastener (surface fastener) is suitable. The hook material has a large number of engaging projections on the outer surface side thereof. The shape of the engaging protrusion is (A) Le-shaped, (B) J-shaped, (C) Mushroom-shaped, (D) T-shaped, (E) Double J-shaped (J-shaped And the like may be any shape. Of course, an adhesive layer can also be provided as a locking portion of the fastening tape 13.

Moreover, as a sheet | seat base material which forms from a tape attachment part to a tape main-body part, although a nonwoven fabric, a plastic film, a polylamination nonwoven fabric, paper, and these composite materials can be used, a fineness of 1.0-3.5 dtex, basis weight A spunbond nonwoven fabric, air-through nonwoven fabric, or spunlace nonwoven fabric having a thickness of ^{20 to} 100 g / m ² and a thickness of 1 mm or less is preferred.

  When the diaper is mounted, the fastening tape is locked at a suitable position on the outer surface of the abdominal portion F with the side flap portion SF of the back portion overlapped on the outside of the side flap portion SF of the abdominal portion F. The position and size of the fastening portion of the fastening tape 13 can be arbitrarily determined. In the diaper for infants, the locking part has a rectangular range of 20 to 80 mm in the front-rear direction and 150 to 300 mm in the width direction, and the distance in the height direction between the upper end edge and the edge on the waist side is 0 to 60 mm, particularly 20 to 20 mm. It is preferably 50 mm and the center in the width direction of the product.

  When the fastening tape 13 is attached so that the tape attachment portion 13C of the fastening tape 13 overlaps the boundary line between the end flap portion EF and the absorber 56 on the back side portion, the attachment portions of the left and right fastening tapes 13 are attached when the diaper is attached. The back end of the absorbent body 56 is firmly pressed against the body by the tension acting between them, which is preferable. Moreover, if the attachment part of the fastening tape 13 is too far from the back side end part (rear end part) of the diaper, the tension acting between the tape attachment parts 13C of the left and right fastening tapes 13 when the diaper is mounted is on the back side of the diaper. Since it does not reach the end, a gap is likely to occur between the back end of the diaper and the body surface. Therefore, it is preferable that the length in the front-rear direction of the end flap portion EF on the back side portion is the same as or shorter than the length in the front-rear direction of the tape attachment portion 13 </ b> C of the fastening tape 13.

(Target sheet)
It is preferable to provide a target sheet 12T having a target for facilitating the locking at the locking portion of the fastening tape 13 in the ventral portion F. As the target sheet 12T, when the hook portion is the hook material 13A, a target sheet 12T can be used in which a large number of loop yarns are formed on the surface of a sheet base material made of a plastic film or nonwoven fabric so that the hook material engagement protrusions are entangled. In the case of an adhesive material layer, a sheet base material made of a plastic film having a smooth surface that is rich in adhesiveness can be used. Further, when the fastening portion of the fastening tape 13 in the ventral portion F is made of a non-woven fabric, for example, when the exterior sheet 12 of the illustrated form is made of a non-woven fabric and the fastening portion of the fastening tape 13 is the hook material 13A. Can omit the target sheet 12T and entangle the hook material 13A with the nonwoven fabric of the exterior sheet 12 to be locked. In this case, the target sheet 12T may be provided between the exterior sheet 12 and the liquid-impermeable sheet 11.

(End flap)
The end flap portion EF is a portion extending from the rear end of the absorber 56 to the front side and the rear side, the front extension portion is the ventral end flap portion EF, and the rear extension portion is It is a back end flap part EF. The constituent material of the end flap portion EF varies depending on the structure of the diaper. In the illustrated form, the region having the intermediate sheet is composed of the top sheet 30, the intermediate sheet 40, the liquid-impermeable sheet 11 and the exterior sheet 12, and has a top sheet on both sides in the width direction of the intermediate sheet. In the area that does not have, the top sheet 30, the liquid-impermeable sheet 11 and the exterior sheet 12 are configured, and in the area where the gather sheet and the top sheet overlap, the gather sheet 62, the top sheet 30, the liquid-impermeable sheet 11 and the exterior sheet. In the region where the gather sheet is not overlapped with the top sheet but is overlapped with the liquid impermeable sheet, the gather sheet 62, the liquid impervious sheet 11 and the exterior sheet 12 are formed, and the gather sheet is the top sheet and the liquid. In areas that do not overlap with the impervious sheet, gather sheets It constituted by 2 and outer sheet 12. The length in the front-rear direction of the end flap EF is preferably the same as or shorter than the length in the front-rear direction of the attachment portion of the fastening tape 13 at the back side portion, and the waist edge and the absorber 56 are close to each other. If too much, a gap is likely to occur between the back side of the diaper and the body surface due to the thickness and stiffness of the absorbent body 56, so that it is preferably 10 mm or more.

  The length in the front-rear direction of the ventral end flap portion EF and the back end flap portion EF is preferably about 5 to 20% of the length L in the front-rear direction of the entire diaper. In diapers for infants, 10-60 mm, In particular, a thickness of 20 to 50 mm is appropriate.

(Expandable structure around the waist)
Characteristically, as shown in FIG. 6 to FIG. 9, the waist side region in the width direction middle or the entire width direction in each of the back side portion B and the abdominal side portion F includes an outer stretchable portion 70 and the outer stretchable portion. The inner and outer independent stretchable regions 20 have an inner stretchable portion 80 that overlaps with the inner surface of the outer stretchable portion 70 and is not joined to the inner surface of the outer stretchable portion 70. The outer stretchable portion 70 and the inner stretchable portion 80 are respectively A plurality of laminated sheet layers, and a waist elastic elastic member 92 attached in a state of extending in the width direction between the pair of sheet layers 91, and the sheet layer is contracted along with the waist elastic elastic member It is a part where shrinkage wrinkles are formed. As shown in FIG. 14, such an inner / outer independent stretchable region 20 has a significantly increased thickness due to the influence of the shrinkage wrinkles 21 as compared with the case where the number of layers is simply increased, and is rich in compressibility to compress in the thickness direction. Since the inner and outer independent stretchable regions 20 are elastically stretched in the direction of the waist by the outer stretchable portion 70 and the inner stretchable portion 80, a thick and highly compressible portion is pressed against the wearer's torso. As a result, it is excellent in the fit with respect to the recessed part around a wearer's trunk, although it is a simple structure. Moreover, in the inner / outer independent stretchable region 20, the gap between the outer stretchable portion 70 and the inner stretchable portion 80 opens at the edge of the waist, so that a padding is inserted between the outer stretchable portion 70 and the inner stretchable portion 80 from the opening. In addition, it is possible to further improve the fit to the recess around the trunk. At this time, since the outer stretchable portion 70 and the inner stretchable portion 80 are elastically stretched, there is also an advantage that the padding put between the outer stretchable portion 70 and the inner stretchable portion 80 is difficult to come out.

  The range of the inner / outer independent stretchable region 20 (the range having the outer stretchable portion 70 and the inner stretchable portion 80 that are not joined to each other) can be determined as appropriate, but extends in the widthwise direction outside the absorber 56 in the widthwise direction. It is desirable to exist, and it is desirable to extend to the center in the width direction rather than the fastening tape 13. As long as the front-rear direction range of the inner and outer independent stretch regions 20 extends to the edge of the waist, the crotch side can be appropriately determined, and as shown in FIG. In addition, as shown in FIG.8 and FIG.9, it is also possible to extend to the position which overlaps the waist side edge part of the absorber 56. FIG. In the latter case, a waist elastic expansion / contraction member 92 may be provided in a portion of the outer expansion / contraction portion 70 and the inner expansion / contraction portion 80 that overlaps the waist side end of the absorber 56, but the configuration shown in FIG. It is also a preferable form that the waist elastic expansion / contraction member 92 is not provided. In other words, since the absorbent body 56 is a thick member in the disposable diaper, if the thickness of the portion overlapping the absorbent body 56 increases too much, the step may lead to a sense of incongruity at the time of wearing. On the other hand, as described above, when the outer elastic portion 70 and the inner elastic portion 80 have a structure in which the waist elastic elastic member 92 is not provided in the portion overlapping the waist side end portion of the absorber 56, the outer elastic portion 70 and the inner expansion / contraction part 80, since the increase in thickness due to the shrinkage wrinkles in the part not having the waist elastic expansion / contraction member 92 is smaller than the part having the waist elastic expansion / contraction member 92, the increase in the thickness of the part overlapping the absorber 56 is small Thus, a feeling of strangeness at the time of wearing is less likely to occur.

  The layer structure of the inner and outer independent stretchable regions 20 can be appropriately determined within the scope of the present invention. In the illustrated form, between the sheet layers 91 in the back side portion B, an inner portion extending from the waist side edge toward the crotch side and the outer side of the waist side are folded back and extended to the waist side edge. A folded elastic elastic band 90A having an outer part is attached in a state of extending in the width direction, and an inner part and an outer part of the folded elastic elastic band 90A are not joined to each other. Therefore, the inner part of the folded elastic elastic band 90A constitutes the inner elastic part 80 together with the inner sheet layer, and the outer part of the folded elastic elastic band 90A constitutes the outer elastic part 70 together with the outer sheet layer. To do. Further, between the sheet layers in the ventral portion F, an inner elastic stretch band 90C and a separate outer elastic stretch band 90B extending from the waist side edge toward the crotch side extend in the width direction. The inner elastic stretch band 90C and the outer elastic stretch band 90B are not joined to each other. Therefore, the inner elastic stretch band 90C forms the inner stretchable portion 80 together with the inner sheet layer, and the outer elastic stretch band 90B constitutes the outer stretchable portion 70 together with the outer sheet layer.

  These elastic stretch bands 90A to 90C are not particularly limited as long as they can be elastically stretched in the width direction, and an elastic film or the like can be used. However, from the viewpoint of air permeability and manufacturability, a pair of elastic stretch bands 90A to 90C as shown in the figure. It is preferable that a plurality of elongated waist elastic expansion / contraction members 92 are attached between the sheet layers 91 in a state of being spaced apart in the front-rear direction and extending in the width direction.

  The folded elastic elastic band 90A, the inner elastic elastic band 90C, and the outer elastic elastic band 90B may have different widths or different materials / structures, but all have the same width and the same structure as illustrated. The outer stretchable portion 70 and the inner stretchable portion 80 can be provided on both the dorsal portion B and the ventral portion F with a minimum of addition to the manufacturing form of a general tape-type disposable diaper. it can. That is, in a general tape-type disposable diaper manufacturing form, after laminating and assembling members in a state where the individual diaper parts are continuous in the front-rear direction, the individual diaper parts are cut and separated at the boundaries of the individual diaper parts. Forming a diaper. At this time, as shown in FIG. 10, a plurality of elongated waist elastic expansion / contraction members 92 are attached between the pair of sheet layers 91 with both the front and rear attached at intervals in the front-rear direction and extending in the width direction. The elastic elastic band 90 is separately manufactured, folded in half at an appropriate position 90x in the middle in the front-rear direction, and then attached so as to straddle the boundary BL of the portion that becomes an individual diaper, and then cut into individual diapers thereafter. The tape type disposable diaper of the above-mentioned structure can be manufactured only. In order to facilitate this understanding, FIG. 7 shows an exploded view of the vicinity of the cutting position in a state immediately after cutting into individual diapers.

  In this way, when the elastic stretch band 90 for both the front and rear is separately manufactured and the method of attaching the elastic stretch band 90 so as to straddle the boundary BL of the individual diaper in a folded state is folded in half. In order to prevent the displacement in the state, it is preferable to join both ends in the width direction of the elastic stretchable band 90 as shown in FIGS. It is preferable to cut the stretchable member 92 finely to kill stretchability. For this joining, intermittent application of hot-melt adhesive (for example, summit or spiral application, or pattern coating (transfer of hot-melt adhesive in relief printing method)) is suitable, but heat sealing, ultrasonic sealing, etc. It is also a preferred form to use joining means by material welding in an intermittent pattern. In FIG. 7 to FIG. 10, a hot melt adhesive for folding back the elastic stretchable band 90 is indicated by reference numeral 93.

  In the illustrated embodiment, the elastic stretch bands 90 </ b> A to 90 </ b> C are the other sheet layers (the sheet layers other than the sheet layer 91 for sandwiching the waist elastic stretch member 92. Specifically, the gather sheet 62 and the top sheet 30. Intermediate sheet 40, packaging sheet 58, liquid-impermeable sheet 11, exterior sheet 12, etc.), but may be a laminated structure exposed on either the front or back of the inner and outer independent stretchable region 20, It is also possible to form the inner / outer independent stretchable region 20 with only the inner elastic stretch band 90C and the outer elastic stretch band 90B. As understood from this, the attachment positions in the thickness direction of the elastic stretch bands 90A to 90C can be appropriately determined. For example, as shown in FIGS. 8 and 9, the absorbent body 56, the intermediate sheet 40, Between the intermediate sheet 40 of the end flap portion EF and the liquid-impermeable sheet 11 and extending in the width direction as shown in FIG. 11 (a). As shown in FIG. 12 (b), as shown in FIG. 12 (b), it is sandwiched between the absorbent body 56 and the liquid-impermeable sheet 11 and extended in the width direction. The sheet can be sandwiched between the liquid-impermeable sheet 11 and the exterior sheet 12 and extending in the width direction.

  The attachment structure of the elastic elastic bands 90A to 90C is not particularly limited. For example, when attaching the elastic elastic bands 90 </ b> A to 90 </ b> C between the other sheet layers 91 as illustrated, at least the elastic force of the waist elastic elastic member 92 acts on the inner elastic part 80 and the outer elastic part 70. Both ends may be fixed to the other sheet layer 91, but in order to prevent displacement between the materials at the waist portion, the whole may be fixed to the other sheet layer 91 as shown in the figure. desirable. For this fixing, intermittent application of hot-melt adhesive (for example, summit or spiral application, or pattern coating (transfer of hot-melt adhesive in letterpress system)) is suitable, but heat sealing, ultrasonic sealing, etc. It is also a preferred form to use joining means by material welding in an intermittent pattern. In FIG. 7, reference numeral 94 denotes a hot melt adhesive for attaching the elastic stretch bands 90 </ b> A to 90 </ b> C.

  As the sheet layer 91 of the elastic stretch bands 90 </ b> A to 90 </ b> C, a material similar to the material used for the exterior sheet 12, the gather sheet 62, and the top sheet 30 can be appropriately selected and used.

  In the illustrated embodiment, the sheet layer 91 to which the waist elastic expansion / contraction member 92 is attached is a dedicated sheet layer 91 for forming elastic expansion / contraction bands 90A to 90C. A waist elastic expansion / contraction member 92 between other sheet layers of the independent expansion / contraction region 20 (in the illustrated embodiment, the gather sheet 62, the top sheet 30, the intermediate sheet 40, the packaging sheet 58, the liquid-impermeable sheet 11, the exterior sheet 12, and the like). Can also be attached.

  The elastic waist member 92 and the sheet layer 91 sandwiching the elastic waist member 92 are fixed so that the elastic force of the elastic waist member 92 acts on the inner elastic portion 80 and the outer elastic portion 70, that is, at least both ends thereof are the sheet layer 91. As long as it is fixed to, there is no particular limitation. For example, only the both ends of the waist elastic expansion / contraction member 92 are fixed to the sheet layer 91, and the waist elastic expansion / contraction member 92 is not fixed to the sheet layer 91 in a range between these fixed positions, and the waist elastic expansion / contraction member is used as necessary. The sheet layers 91 are joined to each other at a position other than the passage position of 92, or the elastic waist members 92 are intermittently fixed to the sheet layer 91 in the width direction, and the sheet layers 91 are intermittently arranged in the width direction as necessary. It is possible to adopt a form in which the waist elastic expansion / contraction member 92 is continuously fixed to the sheet layer 91 in the width direction and the sheet layers 91 are bonded to each other via the waist elastic expansion / contraction member 92. . It is desirable to employ a hot melt adhesive for fixing the waist elastic expansion / contraction member 92, and for joining the sheet layers 91 to each other, it is desirable to use joining means by material welding such as heat sealing or ultrasonic sealing.

  As the elastic waist member 92, a perforated or non-porous elastic film can be used in addition to the elongated elastic waist member 92 such as a thread shape, a string shape, and a belt shape as illustrated. When the elongated waist elastic expansion / contraction member 92 is used, its thickness is not particularly limited, but can be usually 420 to 1120 dtex, and the interval 92d in the front-rear direction is not particularly limited, but is usually about 3 to 10 mm. Although the elongation rate at the time of attachment is not particularly limited, it can be about 150 to 300% in a normal case. The elongation rate of the inner stretchable portion 80 and the stretch rate of the outer stretchable portion 70 may be the same. However, if the stretch rate of the inner stretchable portion 80 is made higher than the stretch rate of the outer stretchable portion 70, the inner and outer independent contractions are different. Since the stretchable region 20 is curved so as to be along the trunk, the fit around the trunk is further improved. In normal cases, it is desirable that the elongation rate of the inner stretchable portion 80 is about 1.2 to 2.0 times the stretch rate of the outer stretchable portion 70.

  The front-rear direction arrangement of the waist elastic expansion / contraction member 92 in the inner expansion / contraction part 80 and the outer expansion / contraction part 70 may be a part of the front-rear direction as well as the entire front-rear direction. In particular, the outer stretchable portion 70 and the inner stretchable portion 80 are shown in FIG. 12A because the thickness increase due to the shrinkage wrinkles in the portion not having the waist elastic stretchable member 92 is less than that in the portion having the waist elastic stretchable member 92. As described above, when the waist elastic expansion / contraction member 92 is not provided in the crotch portion of the inner expansion / contraction portion 80 and the waist elastic expansion / contraction member 92 is provided over the entire front / rear direction in the outer expansion / contraction portion 70, the thickness increases toward the waist side. As a result, the fit to the periphery of the body is further improved, and the damming action of the liquid trying to leak through the surface is also improved. In this case, it is preferable that the length in the front-rear direction of the crotch side portion that does not have the waist elastic stretchable member 92 in the inner stretchable portion 80 is about 15 to 75% of the entire inner stretchable portion 80.

(Other)
(A) In the illustrated embodiment, the inner and outer independent stretchable regions 20 are provided on both the back portion B and the ventral portion F, but only one of them (particularly only the back side) may be used.

  (B) In the illustrated embodiment, the folded elastic stretch band 90A is provided on the back part B, and the outer elastic stretch band 90B and the inner elastic stretch band 90C are provided on the ventral part F. Can be provided on the ventral part F, and the outer elastic stretch band 90B and the inner elastic stretch band 90C can be provided on the back part B, respectively. Also, a folded elastic stretch band 90A may be provided on both the back part B and the abdomen part, or an outer elastic stretch band 90B and an inner elastic stretch band 90C may be provided on both the back part B and the abdomen part. Is possible.

<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 (vertical) direction” means the direction connecting the ventral part (front part) and the back part (rear part), and “width direction” means the direction (left / right direction) perpendicular to the front / rear direction. means.

  “Elongation rate” means a value when the natural length is 100%.

  -"Gel strength" is measured as follows. 49.0 g of artificial urine (urea: 20 wt%, salt: 8 wt%, calcium chloride dihydrate: 0.3 wt%, magnesium oxide heptahydrate: 0.8 wt%, pure water: 70.01 wt%), Add 1.0 g of superabsorbent polymer and stir 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 20 ± 5 ° C., relative humidity 65% or less) to obtain a constant weight. Pre-drying refers to making a sample or test piece constant in an environment where the relative humidity is 10 to 25% and the temperature does not exceed 50 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%. A sample with a size of 200 mm × 250 mm (± 2 mm) is cut out from the test piece in a constant weight using a rice-basis plate (200 mm × 250 mm, ± 2 mm). Measure the weight of the sample, multiply it by 20, calculate the weight per square meter, and use it as the basis weight.

- "thickness" is used automatic thickness measuring instrument (KES-G5 Handy Compression measurement program), load: 10 gf / cm ^2, and the pressure area: automatically measured under the conditions of 2 cm ^2.

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

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

  ・ 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 condition (test location is temperature 20 ± 5 ℃, relative humidity 65% or less). .

  The present invention can be used for a tape-type disposable diaper.

  B ... back side part, F ... ventral side part, 11 ... liquid impervious sheet, 12 ... exterior sheet, 12T ... target sheet, 13 ... fastening tape, 13A ... locking part, 13B ... tape body part, 13C ... tape Attachment part 20 ... Internal / external independent expansion / contraction region, 21 ... Front side layer, 22 ... Back side layer, 25 ... Depression, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbing element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... side gathers, 62 ... gather sheets, 70 ... outer stretchable parts, 80 ... inner stretchable parts, 90 ... elastic stretch bands for both front and rear, 90A to 90C ... elastic stretch bands, 90A ... folded elastic stretch bands, 90B ... Outer elastic elastic band, 90C ... inner elastic elastic band, 91 ... sheet layer, 92 ... waist elastic elastic member.

Claims (5)

An absorber arranged from the ventral part to the dorsal part;
In a tape-type disposable diaper provided with a fastening tape provided on both sides of the back side part and fastened to the outer surface of the abdominal side part,
At least one of the back side portion and the abdominal side portion has a width direction intermediate or entire width direction waist region overlapping the outer stretchable portion and the inside of the outer stretchable portion, and not joined to the inner surface of the outer stretchable portion. It is considered as an internal / external independent expansion / contraction region having an internal expansion / contraction portion.
Each of the outer stretchable portion and the inner stretchable portion has a plurality of laminated sheet layers, and a waist elastic stretchable member attached in a state of extending in the width direction between the pair of sheet layers, and the waist It is a part where shrinkage wrinkles are formed due to shrinkage of the sheet layer with an elastic elastic member,
A tape-type disposable diaper characterized by that.   The tape-type disposable diaper according to claim 1, wherein an elongation rate at the time of attaching the waist elastic stretchable member in the inner stretchable portion is higher than an elongation rate at the time of attaching the waist elastic stretchable member in the outer stretchable portion. The waist side region of the width direction middle or the entire width direction in both the back side portion and the ventral side portion is the inside / outside independent stretch region,
Either one of the dorsal part and the ventral part has an inner part extending from the waist side edge toward the crotch side, and an outer side folded back to the waist side edge at the crotch side edge. A folded elastic elastic band having a part is attached in a state of extending in the width direction,
The inner part and the outer part of the folded elastic elastic band are not joined to each other, the inner part of the folded elastic elastic band is the inner elastic part, and the outer part of the folded elastic elastic band is the outer elastic part. Each is composed
An inner elastic stretch band and a separate outer elastic stretch band that extend from the waist side edge toward the crotch side extend in the width direction on either the back side portion or the ventral side portion. It is attached in the state,
The inner elastic elastic band and the outer elastic elastic band are not joined to each other, the inner elastic elastic band constitutes the inner elastic part, and the outer elastic elastic band constitutes the outer elastic part,
The folded elastic elastic band, the inner elastic elastic band and the outer elastic elastic band have the same width, and a plurality of elongated waist elastic elastic members are spaced in the front-rear direction between a pair of sheet materials, and each has a width direction. It is attached in a stretched state,
The tape-type disposable diaper according to claim 1 or 2. The inner and outer independent stretch regions are extended to a position overlapping the waist side end of the absorber in the front-rear direction,
The waist elastic expansion / contraction member is not provided in a portion overlapping the waist side end portion of the absorber among the outer expansion / contraction portion and the inner expansion / contraction portion,
The tape type disposable diaper of any one of Claims 1-3.   The waist elastic expansion / contraction member is not provided in the crotch part in the inner expansion / contraction portion, and the waist elastic expansion / contraction member is provided over the entire front / rear direction in the outer expansion / contraction portion. The tape type disposable diaper of any one of Claims.