JP6332752B2 - Tape type disposable diaper - Google Patents

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 the body tape, turn the fastening tape from both sides of the waist to the outer surface of the abdomen. It has the structure connected to. 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 to the waistline fit compared to pants-type disposable diapers, and in particular, elastically stretch along the width direction at the waist of the dorsal part to improve leakage from the back. (For example, refer to Patent Document 1), a member that elastically expands and contracts to the fastening tape, a thick dam to the absorber (see, for example, Patent Document 2), or a feces pocket in the absorber It has been proposed.

  However, it is not possible to secure a space for temporarily receiving urine and feces only by improving the fit by elastic expansion and contraction. However, simply providing a weir or a pocket according to the shape of the absorber tends to make the fit insufficient. Moreover, it is not preferable to simply combine the two because the structure becomes complicated.

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

  Therefore, a main problem of the present invention is to provide a tape-type disposable diaper having a simple structure and having a storage space with high fit on the back side.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
An absorbent element arranged from the ventral side to the dorsal side;
Fastening tape provided on both sides of the dorsal side and fastened to the ventral outer surface;
In a tape-type disposable diaper that includes a back side end flap portion that has a front side layer and a back side layer that are extended to the rear side of the rear end of the absorbent element and are formed of a sheet material.
The elastic stretch sheet is attached in a state of extending in the width direction between the front side layer and the back side layer so as to include at least the center part in the width direction of the front end part of the back side end flap part,
The center part in the width direction of at least the front end part of the back side end flap part is such that the surface of the elastic stretch sheet is fixed to the front side layer, the back side is not fixed to the back side layer, and the back side layer does not elastically stretch It is considered to be a part that warps and stretches ,
The uppermost layer of the backside layer is formed that extends from the back side of the rear end portion of the absorbent element in the front-rear direction to the back end flap portion and extends to both sides of the absorbent element in the width direction. A lower stretchable sheet,
Located on the rear side of the rear end of the absorbent element, provided on the lower layer elastic sheet, and comprises an upper layer elastic sheet constituting the elastic elastic sheet,
The lower layer elastic sheet has a portion that elastically expands and contracts in the width direction in addition to the warped elastic portion, and is fixed to a layer adjacent to the back side in a state of extending in the width direction,
At least the front end portion of the back side end flap portion in the width direction center portion, the surface of the upper layer elastic sheet is fixed to the front side layer, the back surface is not fixed to the lower layer elastic sheet, and the lower layer elastic sheet is elastic. By being a portion that does not expand and contract, the warped expansion and contraction portion is formed in the back end flap portion ,
A tape-type disposable diaper characterized by that.

(Function and effect)
In the warp-back elastic part of the present invention, the surface of the elastic elastic sheet is fixed to the front side layer, the back side is not fixed to the back side layer, and the back side layer is a part that does not elastically expand and contract. The backside layer is not directly shrunk, whereas it is shrunk directly. As a result, a force acts on the warped expansion / contraction portion so that both sides in the width direction warp to the front side while contracting in the width direction. And by the influence, the part which has an absorption element located in the front side of a curvature expansion-contraction part deform | transforms, and the hollow used as storage space is formed in the surface. Thus, since the storage space of the present invention is formed by the arrangement and fixing method of the elastic stretchable sheet, the structure becomes very simple. In addition, since the waist-side edge of the recess that serves as a storage space has a warped expansion / contraction portion, and the fit to the body surface is ensured, it is difficult for leakage to occur rearward.
In addition, when the lower layer elastic sheet and the upper layer elastic sheet are provided in combination as described above, overall fit from the rear end portion of the absorbent element to the back end flap portion by the lower layer elastic sheet is ensured, and the upper layer elastic sheet warps. It is preferable because it is possible to achieve both the formation of the stretchable part, the formation of the recess serving as the above-described storage space, and the securing of the fit. Moreover, there is no complication of the structure beyond the two-layered elastic sheet.

<Invention of Claim 2>
2. The tape-type disposable diaper according to claim 1, wherein the warp-back stretchable portion is formed only in a center portion in the width direction of the back end flap portion.

(Function and effect)
The warped and stretchable portion can be provided over a long range in the width direction, but if so, the depression formed on the surface becomes large and loose, and a local storage space cannot be formed. Therefore, when forming a local depression, it is desirable to provide it only at the center in the width direction as described in this section.

<Invention of Claim 3 >
The upper layer elastic sheet has an upper layer and a lower layer formed of a sheet material, and a plurality of elongated elastic elastic members between the upper layer and the lower layer so that elasticity is added only to the warped elastic portion. Are attached in a state of being spaced apart in the front-rear direction and each extending in the width direction,
The lower layer elastic sheet has an upper layer and a lower layer formed of a sheet material, and a plurality of elongated elastic elastic members between the upper layer and the lower layer so that elasticity other than the warped elastic part is added. Are attached in a state of being spaced apart in the front-rear direction and each extending in the width direction,
The tape-type disposable diaper according to claim 1 or 2 .

(Function and effect)
The upper stretchable sheet and the lower stretchable sheet are preferably formed in such a combination of the sheet material and the elongated elastic stretchable member because there is little difference in structure from the conventional one and manufacturing is easy.

<Invention of Claim 4 >
The upper layer stretchable sheet has an upper layer and a lower layer formed of a sheet material, and an elastic stretchable film extends in the width direction between the upper layer and the lower layer so that stretchability is added only to the warped stretchable portion. It is attached in the state that
The lower layer elastic sheet has an upper layer and a lower layer formed of a sheet material, and a plurality of elongated elastic elastic members between the upper layer and the lower layer so that elasticity other than the warped elastic part is added. Are attached in a state where they are spaced apart in the front-rear direction and each stretched in the width direction, or the elastic stretch film is attached in a state stretched in the width direction.
The tape-type disposable diaper according to claim 1 or 2 .

(Function and effect)
The upper layer elastic sheet only needs to add elasticity to the warped elastic part, and when adding local elasticity to such a small area, it is more than a structure that requires continuous pasting like an elongated elastic elastic member. A structure such as an elastic stretchable film that is easy to apply intermittently is preferable. Therefore, it is one preferable form to employ the elastic stretchable film as described in this section.

<Invention of Claim 5 >
An absorbent element arranged from the ventral side to the dorsal side;
Fastening tape provided on both sides of the dorsal side and fastened to the ventral outer surface;
In a tape-type disposable diaper that includes a back side end flap portion that has a front side layer and a back side layer that are extended to the rear side of the rear end of the absorbent element and are formed of a sheet material.
The elastic stretch sheet is attached in a state of extending in the width direction between the front side layer and the back side layer so as to include at least the center part in the width direction of the front end part of the back side end flap part,
The center part in the width direction of at least the front end part of the back side end flap part is such that the surface of the elastic stretch sheet is fixed to the front side layer, the back side is not fixed to the back side layer, and the back side layer does not elastically stretch It is considered to be a part that warps and stretches,
The elastic stretch sheet extends from the back end flap portion in the front-rear direction to the back side of the rear end portion of the absorbent element, and extends to both sides in the width direction of the absorbent element in the width direction.
The elastic stretch sheet has an upper layer and a lower layer formed of a sheet material, and the upper layer and the lower layer so that stretchability is added to the warped stretchable portion and the front and rear positions thereof, respectively. In addition, a plurality of elongated elastic stretch members are attached in a state of being spaced apart in the front-rear direction and extending in the width direction, respectively.
A tape-type disposable diaper characterized by that .

(Function and effect)
Thus, even when the stretchable sheet has a single layer structure, depending on the arrangement and fixing method, the overall fit from the rear end portion of the absorbent element to the back end flap portion is ensured and the above-described storage space is provided. It is possible to achieve both the formation of the recess and the securing of the fit. The structure is also very simple.
In addition, it is preferable that the elastic stretchable sheet is formed by combining the sheet material and the elongated elastic stretchable member in this way because there is little difference in structure from the conventional one and manufacturing is easy.

<Invention of Claim 6 >
An absorbent element arranged from the ventral side to the dorsal side;
Fastening tape provided on both sides of the dorsal side and fastened to the ventral outer surface;
In a tape-type disposable diaper that includes a back side end flap portion that has a front side layer and a back side layer that are extended to the rear side of the rear end of the absorbent element and are formed of a sheet material.
The elastic stretch sheet is attached in a state of extending in the width direction between the front side layer and the back side layer so as to include at least the center part in the width direction of the front end part of the back side end flap part,
The center part in the width direction of at least the front end part of the back side end flap part is such that the surface of the elastic stretch sheet is fixed to the front side layer, the back side is not fixed to the back side layer, and the back side layer does not elastically stretch It is considered to be a part that warps and stretches,
The elastic stretch sheet extends from the back end flap portion in the front-rear direction to the back side of the rear end portion of the absorbent element, and extends to both sides in the width direction of the absorbent element in the width direction.
The elastic stretchable sheet has an upper layer and a lower layer formed of a sheet material, and is provided with stretchability at the warped stretchable portion and front and rear positions thereof, and both sides in the width direction of the warped stretchable portion. The elastic stretch film is attached in an extended state in the width direction between the upper layer and the lower layer so that stretchability is not added.
A tape-type disposable diaper characterized by that .

(Function and effect)
Thus, even when the stretchable sheet has a single layer structure, depending on the arrangement and fixing method, the overall fit from the rear end portion of the absorbent element to the back end flap portion is ensured and the above-described storage space is provided. It is possible to achieve both the formation of the recess and the securing of the fit. The structure is also very simple.
In addition, as described above, it is preferable that the elastic elastic sheet is warped and stretched only at the stretchable part, and it is preferable that stretchability is not added to both sides in the width direction, but such stretchable area is locally stretchable. In the case of addition, a structure such as an elastic stretchable film that allows easy intermittent attachment is preferable to a structure that requires continuous attachment such as an elongated elastic stretchable member. Therefore, it is one preferable form to employ the elastic stretchable film as described in this section.

  As described above, according to the present invention, there is an advantage that a storage space with high fit is formed on the back side with 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. FIG. 9 is a sectional view taken along line 9-9 in FIG. 1. 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. It is an exploded view of the principal part. FIG. 4A is a cross-sectional view corresponding to a cross section taken along line 8-8 in FIG. 1, and FIG. 5B is a cross-sectional view corresponding to a cross section taken along line 4-4 in FIG. It is an exploded view of the principal part. FIG. 4A is a cross-sectional view corresponding to a cross section taken along line 8-8 in FIG. 1, and FIG. 5B is a cross-sectional view corresponding to a cross section taken along line 4-4 in FIG. It is an exploded view of the principal part. It is a top view which expands and shows the principal part of a 2nd form. 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. 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. 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. It is a photograph of a sample. It is a photograph of a sample.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
1-9 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 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 a hot melt adhesive application portion.

  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 absorbent main body 10 which is a portion where the absorbing element 50 is interposed between the liquid-impermeable sheet positioned in the upper portion and the portion extending forward and rearward of the absorbing element 50 (without the absorbing element 50) And a ventral end flap portion EF and a dorsal end flap portion EF.

  Moreover, this tape-type disposable diaper has a pair of side flap parts SF and SF extending laterally from the side edge of the absorber, and the fastening tape 13 is provided on the side flap parts SF and SF on the back side. Are provided.

  More specifically, the entire outer surface of the absorbent main body 10 and the side flap portions SF, SF is formed by the exterior sheet 12. In particular, in the absorbent main body 10, a liquid-impermeable sheet 11 is fixed to the inner surface side of the exterior sheet 12 with an adhesive such as a hot-melt adhesive, and an absorbent element is further disposed on the inner surface side of the liquid-impermeable sheet 11. 50, 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 element 50, and are eaten from the side edges of the absorbent element 50 in the top sheet 30. The peripheral edge that protrudes and the peripheral edge that protrudes from the side edge of the absorbent element 50 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 absorbent main body 10, side solid gathers 60, 60 that protrude (stand up) toward the wearer's skin are provided, and the gather sheets that form the side solid gathers 60, 60 are provided. 62 and 62 are 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 .

(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 leak-proofing by reducing the voids of the fiber by applying heat or pressure, and applying water-absorbing resin or hydrophobic resin or water repellent. A sheet that is liquid-impermeable without using a film can also be used as the liquid-impermeable sheet 11.

(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 in the longitudinal direction of the intermediate sheet 40 may be the same as the entire length of the diaper, may be the same as the length of the absorbent element 50, or may be within a short length range centered on the region that receives the liquid.

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

  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 on 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 since the contraction force of the elastic expansion / contraction member 63 acts, the side three-dimensional gather 60 stands up by the contraction force of the elastic expansion / contraction member 63 and around the leg. 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 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 . 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 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 this 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 has a substantially tapered shape, 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 side F with the back side flap portion SF overlapped with the outside of the abdominal side flap portion SF. The position and size of the fastening portion of the fastening tape 13 can be arbitrarily determined. In diapers for infants, the locking location is 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 edge and the ventral upper edge is 0 to 60 mm, particularly 20 to 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 back end flap portion EF and the absorbing element 50, the fastening tape 13 is placed between the attachment portions of the left and right fastening tapes 13 when the diaper is attached. This is preferable because the back end portion of the absorbent element 50 is firmly pressed against the body by the tension acting on the body. 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, the length in the front-rear direction of the back end flap portion EF is preferably 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 position of the fastening tape 13 on the ventral side 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 on the ventral side F is made of a nonwoven fabric, for example, when the exterior sheet 12 of the illustrated form is made of a nonwoven fabric and the fastening portion of the fastening tape 13 is a hook material 13A, The target sheet 12T can be omitted, and the hook material 13A can be entangled with the nonwoven fabric of the exterior sheet 12 and 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 absorbent element 50 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. As long as the end flap portion EF has a front side layer 21 and a back side layer 22 (layers positioned respectively on the front side and the back side of the elastic stretchable sheets 80 and 90) for forming a warp-back stretchable portion 20 described later, the front side layer What is the sheet material which comprises 21 and the back side layer 22 is not specifically limited. That is, the constituent materials of the front side layer 21 and the back side layer 22 vary depending on the structure of the diaper. There are forms in which the top sheet 30 and the intermediate sheet 40 become the front side layer 21 and the liquid impermeable sheet 11 and the exterior sheet 12 become the back side layer 22, and when the intermediate sheet 40 and the exterior sheet 12 are not provided, the top sheet 30 There is also a form in which only the sheet 30 becomes the front side layer 21 and only the liquid impermeable sheet 11 becomes the back side layer 22. Further, by laminating other sheets on the front side of the top sheet 30 or laminating on the back side of the exterior sheet 12, the top sheet 30 becomes the back side layer 22 or the exterior sheet 12 becomes the front side layer 21. Forms are also possible.

  The length in the front-rear direction of the back 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 for the reason described above. If it is too close, a gap is likely to occur between the back end of the diaper and the body surface due to the thickness and stiffness of the absorbent element 50, 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 20-50 mm is appropriate.

(Backward stretchable structure-first form)
Characteristically, as shown in FIGS. 7 to 9, the rear end portion of the absorbing element 50 and the liquid impervious from between the intermediate sheet 40 and the liquid impermeable sheet 11 in the back end flap portion EF in the front-rear direction. A lower stretchable sheet 70 that extends to the widthwise direction and extends to both sides of the absorbent element 50 in the width direction, and is positioned behind the rear end of the absorbent element 50 and is an intermediate sheet 40 and an upper stretchable sheet 80 provided between the lower stretchable sheet 70 and the lower stretchable sheet 70. In this embodiment, the upper stretchable sheet 80 serves as a reference, the front side layer 21 of the back end flap portion EF is composed of the top sheet 30, and the back side layer 22 is composed of the liquid-impermeable sheet 11, the exterior sheet 12, and the lower layer stretchable sheet 70. Become.

  The lower layer stretchable sheet 70 has a portion that elastically expands and contracts in the width direction (in the illustrated embodiment, a stretchable addition portion by the elongated elastic stretch member 71), and the liquid impervious sheet 11 that is adjacent to the back side in the stretched state in the width direction. And fixed to the exterior sheet 12. On the other hand, the upper layer stretchable sheet 80 is a portion where the portion located at the center in the width direction of the front end portion of the back end flap portion EF elastically expands and contracts in the width direction (in the illustrated form, a stretchable added portion by the elongated elastic stretch member 81). In addition, with the surface extending in the width direction, the surface is fixed to the front layer 21 except for the portion overlapping the absorbent element 50, and only the width direction both ends and rear end 85 of the back surface are fixed to the lower stretchable sheet 70. The other portions 86 are not fixed to the lower stretchable sheet 70. The portion of the upper stretchable sheet 80 that elastically stretches in the width direction and the portion where the non-fixed portion 86 overlaps the lower stretchable sheet 70 is the warped stretchable portion 20 of the present invention. The fixing points on the back surfaces of these members are shown as dot patterns in the exploded view, and can be fixed by hot melt adhesive or welding of materials.

  The warped and stretchable portion 20 configured in this way is a portion where the surface of the upper layer stretchable sheet 80 is fixed to the front side layer 21, the back side is not fixed to the back side layer 22, and the back side layer 22 is not elastically stretched. Therefore, the front side layer 21 is directly shrunk by the elastic stretchable sheet 90, whereas the back side layer 22 is not shrunk directly. As a result, a force is applied to the warped stretchable portion 20 so that both sides in the width direction are warped to the front side while contracting in the width direction, and as a result, as shown in FIG. The portion having the absorbing element 50 is deformed to form a recess 25 on the surface to be a storage space. In the commercially available tape-type disposable diaper shown in FIG. 22 (a), the portion between the fastening tapes 13 elastically expands and contracts in the width direction. It can be understood that it is very characteristic. The storage space formed by the warp expansion / contraction portion 20 is structurally very simple because it is formed by the arrangement and fixation of the elastic expansion / contraction sheet 90, and the edge on the waist side of the recess 25 serving as the storage space. Since there is a warp-back stretchable portion 20 and the fit to the body surface is ensured, it is difficult for leaks to occur backwards. Furthermore, in the illustrated embodiment, since the lower layer elastic sheet 70 and the upper layer elastic sheet 80 are provided in combination, it is possible to ensure overall fit from the rear end portion of the absorbent element 50 to the back end flap portion EF by the lower layer elastic sheet 70. Further, it is possible to achieve both the formation of the warped stretchable portion 20 by the upper-layer stretchable sheet 80 and the formation of the depression 25 serving as the above-described storage space and the securing of the fit.

  The warp-back stretchable portion 20 can be provided over a long range in the width direction. For example, as shown in FIG. 14, it can be provided over substantially the entire width direction of the upper stretchable sheet 80. Thus, the depression 25 formed on the surface becomes large and loose, and a local storage space cannot be formed. Therefore, when forming the local depression 25, as shown in FIGS. 7 to 13 and the like, it is desirable to provide the warped expansion / contraction portion 20 only at the central portion in the width direction of the back end flap portion EF. For example, 20x may be about 40 to 85% of the width 50x of the absorbent element 50. In addition, the warped elastic portion 20 can be provided only in the front end portion of the back end flap portion EF in the front-rear direction, or from the front end portion to the rear end portion of the back end flap portion EF. The position and dimensions of the warp-back stretchable portion 20 can be changed as appropriate depending on the position and degree of overlap between the stretchable portion of the upper stretchable sheet 80 and the portion where the back surface is not fixed.

  The width 86x and the longitudinal length 86y of the non-fixed portion 86 on the back surface of the upper stretchable sheet 80 are not particularly limited as long as they are not less than the warped stretchable stretchable portion 20, and as shown in FIGS. Even in the case where the warped stretchable portion 20 is formed only in the center portion in the width direction, the upper stretchable sheet 80 can be extended to both ends in the width direction. In the normal case, the dimension of the non-fixed portion of the back surface of the upper layer stretchable sheet 80 is about 2.5 to 5 times the width 86x of the warped stretchable portion 20 and the longitudinal length 86y is the lengthwise direction of the warped stretchable portion 20. It can be about 2 to 4 times the length 20y.

  The portion of the surface of the lower layer stretchable sheet 70 that overlaps the absorbent element 50 is preferably unfixed to the absorbent element 50, but can also be fixed.

  It is preferable that the lower layer elastic sheet 70 and the upper layer elastic sheet 80 extend on both sides in the width direction from the absorbent body 56, and in particular, both end portions thereof extend to the side rather than the side edges of the absorbent element 50. Although it is preferable, it may be narrower than that, for example, the width may be the same as or smaller than that of the absorber 56. Further, the widths 70x and 80x of the lower layer stretchable sheet 70 and the upper layer stretchable sheet 80 are the same as in the illustrated embodiment, and either one can be shorter than the other. The length 70y in the front-rear direction of the lower stretchable sheet 70 is appropriate to be approximately the same as the length in the front-rear direction of the attachment portion of the fastening tape 13, but a dimensional difference of about ± 20% may be provided. The length 70y in the front-rear direction of the lower stretchable sheet 70 is preferably about 150 to 300% of the length in the front-rear direction of the end flap portion EF. The length 80y in the front-rear direction of the upper stretchable sheet 80 is preferably about 70 to 140% of the length in the front-rear direction of the end flap EF, and 30-60% of the length 70y in the front-rear direction of the lower stretchable sheet 70. It is preferable to set the degree.

  The lower elastic sheet 70 is preferably provided with a part that elastically expands and contracts in the width direction over almost the entire area except for the warped elastic part 20, but can also be provided partially. Moreover, it is preferable not to provide a portion that elastically expands and contracts at least in the intermediate portion in the width direction in the region overlapping the absorber 56 in the lower layer stretchable sheet 70.

  The upper stretchable sheet 80 may be provided with a portion that elastically expands and contracts in the width direction only in the warp stretchable portion 20, and may also be provided with a portion that elastically stretches in the width direction on the other side, for example, the rear side of the warp stretchable stretchable portion 20. it can. It is preferable not to provide a portion that elastically expands and contracts in the width direction on both sides in the width direction of the warped elastic portion 20, but when a portion that elastically expands and contracts in the width direction is provided on the rear side of the warped elastic portion 20, the warp elastic portion 20 Can also be provided up to both sides in the width direction.

  Moreover, in the form in which both end portions of the lower layer stretchable sheet 70 and the upper layer stretchable sheet 80 are extended to the portions overlapping the attachment portions of both fastening tapes 13 as shown in the figure, the appearance and workability at the time of tape attachment are good. Therefore, it is preferable not to provide a portion that elastically expands and contracts in the width direction at both ends of the lower layer elastic sheet 70 and the upper layer elastic sheet 80, but it is also possible to provide a portion that elastically expands and contracts in the width direction to both ends. .

  The method of providing the lower elastic sheet 70 and the upper elastic sheet 80 with a portion that elastically expands and contracts in the width direction is not particularly limited. However, as shown in FIGS. 7 to 9, the sheet materials 72 and 73, the elongated elastic elastic member 71, It is preferable to form it by a combination of the above because the difference in structure from the conventional one is small and the manufacturing is easy. That is, in the illustrated embodiment, the upper layer stretchable sheet 80 has an upper layer 82 and a lower layer 83 formed by the sheet materials 82 and 83, and at least the warp stretchable portion 20 is stretched so that stretchability is added. It is assumed that a plurality of elongated elastic elastic members 81 are attached between 83 in a state of being spaced apart in the front-rear direction and extending in the width direction. In addition, the lower layer elastic sheet 70 includes the upper layer 72 and the lower layer 73 formed by the sheet materials 72 and 73, and the upper layer 72 and the lower layer 73 are added so as to have elasticity other than the warped elastic portion 20. A plurality of elongate elastic elastic members 71 are attached in a state of being spaced apart in the front-rear direction and extending in the width direction.

  The upper layers 72 and 82 and the lower layers 82 and 83 forming the lower layer stretchable sheet 70 and the upper layer stretchable sheet 80 are bonded together by a welding means such as heat seal or ultrasonic seal in addition to the hot melt adhesive, and between them. Elongated elastic elastic members 71 and 81 such as elongated (string or string) are attached in an extended state. The upper layers 72 and 82 and the lower layers 82 and 83 forming the lower layer stretchable sheet 70 and the upper layer stretchable sheet 80 are formed by folding one sheet material in the illustrated form, but two separate sheets are opposed to each other. You may let them. As the sheet materials 72 and 73, a breathable material such as a nonwoven fabric can be used. Further, as the elongated elastic elastic members 71 and 81, it is preferable to provide about 5 to 15 members having a thickness of 420 to 1120 dtex with an elongation ratio of about 150 to 250% and an interval d of 3 to 10 mm.

  The upper layer elastic sheet 80 only needs to add elasticity to the warped expansion / contraction part 20, and when the elasticity is locally added to such a small area, it can be continuously pasted like the elongated elastic elastic members 71, 81. A structure that is easy to intermittently attach, such as an elastic stretch film, is preferable to the required structure. Therefore, as shown in FIGS. 10 and 11, it is also preferable to use an elastic stretch film 84 as means for adding stretchability to the upper stretchable sheet 80. In this case, as shown in FIGS. 10 and 11, as means for adding stretchability to the lower stretchable sheet 70, an elongated elastic stretchable member 71 is used, and as shown in FIGS. 12 and 13, the upper stretchable sheet is used. Similarly to 80, an elastic stretch film 74 can be used. The elastic stretchable films 74 and 84 are preferably formed with a large number of holes or slits for ventilation.

  In this way, when the upper layer stretchable sheet 80 and the lower layer stretchable sheet 70 are provided with a stretchable portion and a non-stretchable portion, elastic stretchable members 71, 81, 74, and 84 are provided at the stretchable portion and elastic portions are not stretched. In addition to the configuration in which the elastic members 71, 81, 74, and 84 are not provided, elastic elastic members 71, 81, 74, and 84 are provided over both portions, and the elastic elastic members 71, 81, 74, and 84 are finely formed in the portions that do not expand and contract. It can be set as the form which kills stretchability by cut | disconnecting. The former is suitable for the elastic elastic films 74 and 84, and the latter is suitable for the form using the elongated elastic elastic members 71 and 81.

(Back-side stretchable structure-second form)
In the first embodiment, a two-layer structure of the stretchable sheet is adopted, but even when the stretchable sheet has a single-layer structure as shown in FIGS. 15 to 17, it is the same as the two-layer structure depending on the arrangement and fixing method. Furthermore, it is possible to achieve both the securing of the overall fit from the rear end portion of the absorbent element 50 to the back end flap portion EF, the formation of the depression 25 serving as the storage space, and the securing of the fit. .

  That is, in the second embodiment, in the front-rear direction, from between the intermediate sheet 40 and the liquid impermeable sheet 11 in the back end flap portion EF to between the rear end portion of the absorbent element 50 and the liquid impermeable sheet 11. The elastic elastic sheet 90 is provided that extends to both sides of the absorbent element 50 in the width direction. In this embodiment, the elastic elastic sheet 90 is used as a reference, the front side layer 91 of the back end flap portion EF is made of the top sheet 30, and the back side layer 22 is made of the liquid-impermeable sheet 11 and the exterior sheet 12.

  The elastic stretchable sheet 90 is elastically stretched in the width direction at the center portion in the width direction of the front end portion of the back end flap portion EF, and at both sides in the width direction on the front side and almost the entire width direction on the rear side. A portion to be stretched (in the illustrated form, a stretchable added portion by the elongated elastic stretch member 91), and in a state of being stretched in the width direction, the surface is fixed to the front side layer 21 except for a portion overlapping the absorbent element 50, In the back surface, a portion 96 including the central portion in the width direction of the front end portion of the back end flap portion EF is not fixed to the back side layer 22, and a peripheral portion 95 is fixed to the back side layer 22. The portion of the elastic stretchable sheet 90 that elastically stretches in the width direction and the portion 96 that is not fixed to the back side layer 22 overlap is the warped stretchable stretched portion 20 of the present invention. The fixing points between these members are indicated by dot patterns in the exploded assembly drawing, and can be fixed by hot melt adhesive or welding of materials.

  Also in the second embodiment, substantially the same effect as in the first embodiment can be obtained. That is, even in the warped elastic portion 20 of the second embodiment, the surface of the elastic elastic sheet 90 is fixed to the front side layer 21, the back surface is not fixed to the back side layer 22, and the back side layer 22 is a portion that does not elastically expand and contract. Therefore, the front side layer 21 is directly shrunk by the elastic stretchable sheet 90, whereas the back side layer 22 is not shrunk directly. As a result, a force acts on the warped stretchable portion 20 so that both sides in the width direction are warped to the front side while contracting in the width direction, and as a result, as shown in FIG. The portion having the absorbing element 50 is deformed to form a recess 25 on the surface to be a storage space. Since this storage space is formed by the arrangement and fixing method of the elastic stretchable sheet 90, it is structurally very simple, and there is a warped stretchable portion 20 at the edge on the waist side of the recess 25 serving as the storage space. And since the fitting property with respect to a body surface is ensured, it will become difficult to generate | occur | produce backward. Further, in the second embodiment, although the elastic stretchable sheet 90 has a single layer structure, the elastic stretchable sheet 90 extends to both the front and rear sides of the warped stretchable stretchable portion 20. The overall fit to the side end flap portion EF is also ensured.

  Also in the second embodiment, the warp-back stretchable portion 20 can be provided over a long range in the width direction, for example, as shown in FIGS. 15 to 16, can be provided over substantially the entire width of the upper stretchable sheet 80. However, if it does so, as shown to Fig.23 (a), the hollow 25 formed in the surface will become large loosely, and a local storage space cannot be formed. Therefore, when the local depression 25 is formed, it is desirable to provide the warped stretchable portion 20 only at the center in the width direction of the back end flap portion EF, as in the example shown in FIG. In addition, the warped elastic portion 20 can be provided only in the front end portion of the back end flap portion EF in the front-rear direction, or from the front end portion to the rear end portion of the back end flap portion EF. The position and size of the warp-back stretchable portion 20 can be appropriately changed depending on the position and degree of overlap between the stretchable portion of the elastic stretchable sheet 90 and the portion 96 where the back surface is not fixed.

  The width 96x and the front-rear direction length 96y of the non-fixed portion 96 on the back surface of the elastic stretchable sheet 90 are not particularly limited as long as it is not less than the warped stretchable stretchable portion 20, and as shown in FIG. Even in the case of forming the warped elastic part 20 only at the end, the elastic elastic sheet 90 can be extended to both ends in the width direction. In a normal case, the dimensions of the non-fixed portion 96 on the back surface of the elastic stretchable sheet 90 are 2.5 to 5 times the width 96x of the warped stretchable portion 20 and the longitudinal length 96y is the longitudinal direction of the warped stretchable portion 20. It can be 2 to 4 times the length 20y.

  The portion of the surface of the elastic stretchable sheet 90 that overlaps the absorbent element 50 is preferably unfixed to the absorbent element 50, but can also be fixed.

  The elastic stretchable sheet 90 is preferably extended to both sides in the width direction than the absorbent element 50, and in particular, both end portions thereof are preferably extended to the side rather than the side edges of the absorbent element 50. For example, the width may be the same as or smaller than that of the absorbent element 50. The front-rear direction length 90y of the elastic stretchable sheet 90 is suitably substantially the same as the front-rear direction length of the attachment portion of the fastening tape 13, but a dimensional difference of about ± 20% may be provided. In normal cases, the longitudinal length 90y of the elastic stretchable sheet 90 is preferably about 150 to 300% of the longitudinal length of the end flap portion EF.

  The elastic stretchable sheet 90 is provided with a warped stretchable portion 20 and other portions that elastically stretch in the width direction (in the illustrated embodiment, stretchable portions by the elongated elastic stretchable member 91). In the illustrated embodiment, both sides in the width direction on the front side of the warped expansion / contraction portion 20 and portions that elastically expand / contract on the entire width direction on the rear side thereof are provided, but only one of them may be provided. Further, it is preferable not to provide elastically expanding / contracting portions in the width direction on both sides in the width direction of the warped expansion / contraction portion 20. In addition, it is preferable not to provide a portion that elastically expands and contracts at least in the intermediate portion in the width direction of the region of the elastic stretchable sheet 90 that overlaps the absorbent element 50.

  Moreover, in the form in which both end portions of the elastic stretchable sheet 90 are extended to a portion overlapping with the attachment portions of both fastening tapes 13 as shown in the figure, in order to improve the appearance and workability at the time of tape attachment, It is preferable not to provide a portion that elastically expands and contracts in the width direction at both ends of the elastic stretchable sheet 90, but a portion that elastically expands and contracts in the width direction to both ends can also be provided.

  The method of providing the elastic elastic sheet 90 with a portion that elastically expands and contracts in the width direction is not particularly limited. However, as shown in FIGS. 15 to 17, when formed by a combination of sheet materials 92 and 93 and an elongated elastic elastic member 91. It is preferable because the difference in structure from the conventional one is small and manufacturing is easy. That is, in the illustrated embodiment, the elastic stretchable sheet 90 has an upper layer 92 and a lower layer 93 formed by the sheet materials 92 and 93, and the warped stretchable portion 20 and the stretchable portions at the front side and rear side positions thereof are respectively provided. As added, a plurality of elongated elastic elastic members 91 are attached between the upper layer 92 and the lower layer 93 in a state of being spaced apart in the front-rear direction and extending in the width direction.

  The upper layer 92 and the lower layer 93 forming the elastic stretchable sheet 90 are bonded together by a welding means such as heat seal or ultrasonic seal in addition to a hot melt adhesive, and an elongated shape (thread shape or string shape) between them. The elongated elastic elastic member 91 is attached in an extended state. The upper layer 92 and the lower layer 93 that form the elastic stretchable sheet 90 are formed by folding back one sheet material in the illustrated embodiment, but two separate sheets may be opposed to each other. As the sheet materials 92 and 93, a breathable material such as a nonwoven fabric can be used. Further, as the elongated elastic elastic member 91, it is preferable to provide about 5 to 15 members having a thickness of 420 to 1120 dtex with an elongation of about 150 to 250% and a distance d of 3 to 10 mm.

  It is preferable that the elastic stretch sheet 90 be warped and stretched only on the stretchable portion 20 and not stretchable on both sides in the width direction. However, when the stretchability is locally added to such a small area, it is elongated. A structure that is easy to intermittently attach, such as an elastic stretchable film, is preferable to a structure that requires continuous attachment, such as the elastic elastic member 91. Therefore, as shown in FIGS. 18 and 19, it is also preferable to use an elastic stretchable film 94 as a means for adding stretchability to the curved stretchable portion 20 of the elastic stretchable sheet 90. In this case, as shown in FIGS. 18 and 19, the elastic stretchable film 94 is used as a means for adding stretchability in addition to the warped stretchable portion 20, and an elastic stretchable film 94 is used as in the case of the warped stretchable portion 20, although not shown. A member can also be used. The elastic stretchable film 94 is preferably formed with a number of holes or slits for ventilation.

  Furthermore, in the case of a single layer structure, as shown in FIGS. 20 and 21, the elastic stretchable sheet 90 can be constituted by only the elastic stretchable film 94. In this case, the structure is further simplified, which is preferable.

  In the case where the elastic stretchable sheet 90 is provided with a stretchable portion and a non-stretchable portion, the elastic stretchable members 91 and 94 are provided in the stretchable portion, and the elastic stretchable members 91 and 94 are not provided in the non-stretchable portion. The elastic stretchable members 91 and 94 are provided over both portions, and the elastic stretchable members 91 and 94 are finely cut in the portions where the stretchable portions are not stretched, whereby the stretchability can be killed. The former is suitable for the elastic stretch film 94, and the latter is suitable for the form using the elongated elastic stretch member 91.

  On the other hand, in the form shown in FIGS. 15 to 17, since the elastic stretch sheet 90 for forming the warp stretchable part 20 extends to the back side of the absorbent element 50, the warp stretchable part 20 as compared with the first form. The contractile force acting on the heel is reduced. Therefore, as shown in FIGS. 18 and 19, a slit 97 is formed in the elastic stretchable sheet 90 along the boundary between the warped stretchable stretched portion 20 of the elastic stretchable sheet 90 and the portion located on the back side of the absorbent element 50. As shown in FIGS. 20 and 21, it is also preferable to cut out a portion of the elastic stretchable sheet 90 that overlaps the absorbent element 50.

(Other forms)
In the second form, the elastic stretchable sheet 90 extends to the back side of the absorbent element 50, but it can also be provided so as to fit in the rear side of the absorbent element 50, that is, in the back end flap portion EF. Further, the elastic stretchable sheet 90 may be provided only in the warped stretchable portion 20, for example, only in the center in the width direction of the back end flap portion EF, and no other widthwise stretchable elements may be provided on the back side.

<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 a direction connecting the ventral side (front side) and the back side (rear side), and the “width direction” means a direction (left / right direction) orthogonal to the front / rear direction.

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

  ・ "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 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 .

  -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. .

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

  DESCRIPTION OF SYMBOLS 11 ... Liquid impervious sheet, 12 ... Exterior sheet, 12T ... Target sheet, 13 ... Fastening tape, 13A ... Locking part, 13B ... Tape body part, 13C ... Tape attaching part, 20 ... Warping-back expansion / contraction part, 21 ... Front side Layer, 22 ... back side layer, 25 ... depression, 30 ... top sheet, 40 ... intermediate sheet, 50 ... absorbent element, 56 ... absorbent, 58 ... packaging sheet, 60 ... side solid gather, 62 ... gather sheet, 70 ... Lower layer elastic sheet, 80 ... Upper layer elastic sheet, 90 ... Elastic elastic sheet, EF ... End flap part.

Claims (6)

An absorbent element arranged from the ventral side to the dorsal side;
Fastening tape provided on both sides of the dorsal side and fastened to the ventral outer surface;
In a tape-type disposable diaper that includes a back side end flap portion that has a front side layer and a back side layer that are extended to the rear side of the rear end of the absorbent element and are formed of a sheet material.
The elastic stretch sheet is attached in a state of extending in the width direction between the front side layer and the back side layer so as to include at least the center part in the width direction of the front end part of the back side end flap part,
The center part in the width direction of at least the front end part of the back side end flap part is such that the surface of the elastic stretch sheet is fixed to the front side layer, the back side is not fixed to the back side layer, and the back side layer does not elastically stretch It is considered to be a part that warps and stretches ,
The uppermost layer of the backside layer is formed that extends from the back side of the rear end portion of the absorbent element in the front-rear direction to the back end flap portion and extends to both sides of the absorbent element in the width direction. A lower stretchable sheet,
Located on the rear side of the rear end of the absorbent element, provided on the lower layer elastic sheet, and comprises an upper layer elastic sheet constituting the elastic elastic sheet,
The lower layer elastic sheet has a portion that elastically expands and contracts in the width direction in addition to the warped elastic portion, and is fixed to a layer adjacent to the back side in a state of extending in the width direction,
At least the front end portion of the back side end flap portion in the width direction center portion, the surface of the upper layer elastic sheet is fixed to the front side layer, the back surface is not fixed to the lower layer elastic sheet, and the lower layer elastic sheet is elastic. By being a portion that does not expand and contract, the warped expansion and contraction portion is formed in the back end flap portion ,
A tape-type disposable diaper characterized by that.   2. The tape-type disposable diaper according to claim 1, wherein the warp-back stretchable portion is formed only in a center portion in the width direction of the back end flap portion. The upper layer elastic sheet has an upper layer and a lower layer formed of a sheet material, and a plurality of elongated elastic elastic members between the upper layer and the lower layer so that elasticity is added only to the warped elastic portion. Are attached in a state of being spaced apart in the front-rear direction and each extending in the width direction,
The lower layer elastic sheet has an upper layer and a lower layer formed of a sheet material, and a plurality of elongated elastic elastic members between the upper layer and the lower layer so that elasticity other than the warped elastic part is added. Are attached in a state of being spaced apart in the front-rear direction and each extending in the width direction,
The tape-type disposable diaper according to claim 1 or 2 . The upper layer stretchable sheet has an upper layer and a lower layer formed of a sheet material, and an elastic stretchable film extends in the width direction between the upper layer and the lower layer so that stretchability is added only to the warped stretchable portion. It is attached in the state that
The lower layer elastic sheet has an upper layer and a lower layer formed of a sheet material, and a plurality of elongated elastic elastic members between the upper layer and the lower layer so that elasticity other than the warped elastic part is added. Are attached in a state where they are spaced apart in the front-rear direction and each stretched in the width direction, or the elastic stretch film is attached in a state stretched in the width direction.
The tape-type disposable diaper according to claim 1 or 2 . An absorbent element arranged from the ventral side to the dorsal side;
Fastening tape provided on both sides of the dorsal side and fastened to the ventral outer surface;
In a tape-type disposable diaper that includes a back side end flap portion that has a front side layer and a back side layer that are extended to the rear side of the rear end of the absorbent element and are formed of a sheet material.
The elastic stretch sheet is attached in a state of extending in the width direction between the front side layer and the back side layer so as to include at least the center part in the width direction of the front end part of the back side end flap part,
The center part in the width direction of at least the front end part of the back side end flap part is such that the surface of the elastic stretch sheet is fixed to the front side layer, the back side is not fixed to the back side layer, and the back side layer does not elastically stretch It is considered to be a part that warps and stretches,
The elastic stretch sheet extends from the back end flap portion in the front-rear direction to the back side of the rear end portion of the absorbent element, and extends to both sides in the width direction of the absorbent element in the width direction.
The elastic stretch sheet has an upper layer and a lower layer formed of a sheet material, and the upper layer and the lower layer so that stretchability is added to the warped stretchable portion and the front and rear positions thereof, respectively. In addition, a plurality of elongated elastic stretch members are attached in a state of being spaced apart in the front-rear direction and extending in the width direction, respectively.
A tape-type disposable diaper characterized by that . An absorbent element arranged from the ventral side to the dorsal side;
Fastening tape provided on both sides of the dorsal side and fastened to the ventral outer surface;
In a tape-type disposable diaper that includes a back side end flap portion that has a front side layer and a back side layer that are extended to the rear side of the rear end of the absorbent element and are formed of a sheet material.
The elastic stretch sheet is attached in a state of extending in the width direction between the front side layer and the back side layer so as to include at least the center part in the width direction of the front end part of the back side end flap part,
The center part in the width direction of at least the front end part of the back side end flap part is such that the surface of the elastic stretch sheet is fixed to the front side layer, the back side is not fixed to the back side layer, and the back side layer does not elastically stretch It is considered to be a part that warps and stretches,
The elastic stretch sheet extends from the back end flap portion in the front-rear direction to the back side of the rear end portion of the absorbent element, and extends to both sides in the width direction of the absorbent element in the width direction.
The elastic stretchable sheet has an upper layer and a lower layer formed of a sheet material, and is provided with stretchability at the warped stretchable portion and front and rear positions thereof, and both sides in the width direction of the warped stretchable portion. The elastic stretch film is attached in an extended state in the width direction between the upper layer and the lower layer so that stretchability is not added.
A tape-type disposable diaper characterized by that .