JP2012065935A - Securing type disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the fitting property around legs in a securing pipe disposable diaper.SOLUTION: In the securing type disposable diaper, regions including at least parts of the fringes N around legs of an abdominal side F in an fore and aft direction of the side flap parts SF extending to lateral sides of an absorbing body and including from the side fringes of the back sheet 11 to the side fringes of diaper in a width direction are abdominal side around leg expandable areas 91 comprising expandable nonwoven cloths 12F.

Description

  The present invention relates to a fastening type disposable diaper.

A tape-type disposable diaper, which is a typical example of a stationary disposable diaper, has a fastening tape on both sides on the back side and a target tape on the outside of the stomach side, and the fastening tape is locked to the target tape. By doing so, it will be installed.
In such a tape-type disposable diaper, in order to improve the fit around the legs, an elongated elastic elastic member such as rubber thread is attached to both sides along the front-rear direction (for example, Patent Documents). 1).
In addition, the elastic elastic members on both sides are bent and attached along the legs (see, for example, Patent Document 2).

JP 2010-154928 A JP 2010-022588 A

However, in these conventional fastening type disposable diapers, when a certain amount of time has passed after wearing or the size is smaller than the appropriate size, as shown in circles in FIGS. Due to the low fit, the leg-neared portion N bites into the wearer's heel line and buttocks, and the feeling of wearing deteriorates, or the ventral or dorsal part shrinks in the width direction, making it easy to leak sideways There was a problem of becoming.
Then, the main subject of this invention is improving the fitting property of the leg periphery in a fastening type disposable diaper.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
Having a crotch part, a ventral part extending to the front side of the crotch part, and a dorsal part extending to the rear side of the crotch part,
An absorbent body extending along the center in the width direction from the ventral part to the back part, a liquid-permeable top sheet covering the front side of the absorbent body, and a back sheet covering the back side of the absorbent body,
Locked against the outer surface of the ventral part provided on the pair of left and right side flaps extending from the ventral part to the dorsal part on both sides of the absorber, and the left and right side flaps of the dorsal part And a locking portion to be
Both side edges of the back sheet are located on the outer side in the width direction than both side edges of the top sheet, and are respectively located in the middle in the width direction of the side flap part,
On the side edges of both side flap portions of the intermediate region in the front-rear direction extending from the dorsal side portion to the ventral side portion, there is a leg periphery edge constricted along the periphery of the leg,
Of the side flap portion, the region including at least a part of the leg periphery edge of the ventral portion in the front-rear direction and including the side edge of the backsheet to the side edge of the diaper in the width direction is made of stretchable nonwoven fabric. The elastic region around the ventral leg,
Fastening type disposable diaper characterized by that.

(Function and effect)
By providing an elastic stretch area around the ventral leg made of stretchable nonwoven fabric in this way, the leg circumference elastically stretches in all directions, not only in the width direction but also in the vertical direction and diagonal direction, and the fit around the leg is remarkable To improve. As a result, it is possible to effectively suppress problems such as biting into the shoreline of the wearer, which tend to be in the stationary type, and deterioration of the wearing feeling due thereto, or side leakage due to contraction in the width direction of the abdominal part.

<Invention of Claim 2>
Of the side flap portion, an area including a lengthwise middle position of a leg periphery edge at the ventral portion in the front-rear direction to a waist edge and a region including the side edge of the backsheet to the side edge of the diaper in the width direction are expanded and contracted. It is an elastic stretch area around the ventral leg made of nonwoven fabric,
Of the side flap portion, a region including a lengthwise middle position of a leg periphery edge in the back side portion in the front-rear direction to a waist edge, and a region including the side edge of the backsheet to the side edge of the diaper in the width direction is stretchable. It is an elastic stretch area around the back leg made of non-woven fabric,
Of the side flap portion, the elongated elastic elastic member extends along the front-rear direction in the elastic elastic region around the ventral leg or in the vicinity thereof to the elastic elastic region around the back leg or in the vicinity thereof. It is the middle part elastic stretchable area fixed with
The fastening type disposable diaper according to claim 1.

(Function and effect)
In this way, the side flap portion is divided into three regions in the front-rear direction, and a stretchable nonwoven fabric is provided by providing an elastic stretch region around the ventral leg, an elastic stretch region around the back leg, and an intermediate elastic stretch region connecting them. While suppressing the amount used, the fit to the entire leg circumference can be improved.

<Invention of Claim 3>
It has a base end portion fixed to the inner surface side of the intermediate elastic stretchable region and an effect portion extending from the base end portion, and the front and rear end portions of the extension portion are fixed portions that do not stand up. A non-fixed free part is formed so as to stand between the fixed parts, and an elongated elastic elastic member is fixed to the free part in a stretched state along the front-rear direction. With a three-dimensional gather that fits within the range,
The ventral leg elastic stretch region and the back leg elastic stretch region extend to the center side in the width direction to the front side and the rear side of the three-dimensional gather, respectively.
The fastening type disposable diaper according to claim 2.

(Function and effect)
In disposable diapers, it is common to provide so-called three-dimensional gathers on the left and right sides of the inner surface. The three-dimensional gather is generally provided over the entire front and rear direction of the diaper, but the three-dimensional gather is shortened so as to be within the front-rear direction range of the middle elastic stretchable region, and the vacant parts (front and rear sides of the three-dimensional gather). ) By extending the elastic elastic region around the ventral leg and the elastic elastic region around the back leg toward the center in the width direction, the region of the stretchable nonwoven fabric that can be expanded and contracted in all directions can be expanded, The fit to the surroundings becomes even better.

  As described above, according to the present invention, there are advantages such as improved fit around the legs in a stationary disposable diaper.

It is a top view in the state where the diaper was developed showing the inner surface of a fixation type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a fixation 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. 8 is a cross-sectional view taken along line 8-8 in FIG. 1. FIG. 9 is a sectional view taken along line 9-9 in FIG. 1. It is the photograph of the state which made the dummy doll put on the sample of the fastening type disposable diaper which concerns on this invention. It is the photograph of the state which made the dummy doll put on the sample of the fastening type disposable diaper which concerns on this invention. It is the photograph of the state which made the dummy doll wear the sample of the conventional fastening type disposable diaper. It is the photograph of the state which made the dummy doll wear the sample of the conventional fastening type disposable diaper.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, “front-rear direction (vertical direction)” means a direction connecting the ventral side (front side) and back side (rear side), and “width direction” means a direction (left-right direction) perpendicular to the front-rear direction. Direction).

  1-6 has shown an example of the tape type disposable diaper. 3 and 4 are views showing a cross section taken along line 6-6 and 7-7 in FIG. 1, respectively, and FIGS. 5 and 6 are cross sections taken along line 8-8 and 9-9 in FIG. FIG. This tape-type disposable diaper includes a crotch back sheet located in the center in the front-rear direction, a ventral part F extending to the front side of the crotch back sheet, and a back part B extending to the rear side of the crotch back sheet. The absorbent body 56 extends along the center in the width direction from the ventral part F to the back part B, and the liquid-permeable top sheet 30 that covers the front side of the absorbent body 56 and the absorption A back sheet 11 that covers the back side of the body 56 is provided. Further, the abdomen end flap part FE and the dorsal end flap part BE extending respectively to the front side and the rear side of the absorbent body 56 and the both sides of the absorbent body 56 extending from the abdominal side part F to the back side part B. It has a pair of left and right side flap portions SF, SF, and a leg periphery edge N that is constricted along the periphery of the leg is formed on the side edge of the intermediate region in the front-rear direction in the side flap portion SF. Fastening tapes 13 serving as locking portions that are locked to the outer surface of the ventral portion F are provided on the side flap portions SF and SF in the side portion B.

  More specifically, the entire outer surface of the absorbent main body 10 and the side flap portions BF and FF on the back side and the abdomen side is formed by the exterior sheet 12. In particular, in the absorbent main body 10, the back sheet 11 is fixed to the inner surface side of the exterior sheet 12 with an adhesive such as a hot melt adhesive, and the absorbent body 56 is further disposed on the inner surface side of the back sheet 11. The absorbent element 50, the intermediate sheet 40, and the top sheet 30 that are wrapped in the above are laminated in this order. The top sheet 30 and the back sheet 11 are rectangular in the illustrated example, have a slightly larger dimension in the front-rear direction and the width direction than the absorbent element 50, and a peripheral edge that protrudes from the side edge of the absorbent element 50 in the top sheet 30. The peripheral portion protruding from the side edge of the absorbent element 50 in the backsheet 11 is fixed by a hot melt adhesive or the like. The back 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, and both side edges thereof are outside in the width direction from both side edges of the top sheet 30, and side flap portions are formed. It is located in the middle of the width direction of SF.

  The exterior sheet 12 includes a first front-rear direction region 81 from the longitudinal middle position of the leg periphery edge N to the waist edge in the ventral part F, and a longitudinal middle position of the leg periphery edge N to the waist edge in the back side part B. The stretchable nonwoven fabrics 12F and 12B, which are divided into three regions, a second front-rear direction region 82 and a third front-rear direction region 83 between them, and the first front-rear direction region 81 and the second front-rear direction region 82, 3 The non-stretchable nonwoven fabric 12C forming the front-rear direction region 83 is joined together.

  The side flap portion SF is formed in the first front-rear direction region 81 and the second front-rear direction region 82 by folding the stretchable nonwoven fabrics 12F, 12B inwardly, and the third front-rear direction region 83 is three-dimensional over the entire width direction. The base ends of the gathers 60 are bonded together.

  And by setting it as such a structure, it is a side edge of the back seat | sheet 11 in the width direction from the longitudinal direction intermediate position of the leg periphery edge N in the ventral part F in the front-back direction to the waist edge among the side flap parts SF. A region including the side edge of the diaper is a stretchable elastic region 91 around the ventral leg made of the stretchable nonwoven fabric 12F. A region including the side edge of the backsheet 11 to the side edge of the diaper is a back leg-around elastic stretchable region 92 made of the stretchable nonwoven fabric 12B. By providing the elastic expansion / contraction region 91 and the elastic expansion / contraction region 92 around the abdominal leg made of the elastic nonwoven fabric, as shown in FIGS. 7 and 8, the leg periphery edge N is not only in the width direction but also in the vertical direction. Elastically expands and contracts in all directions, such as oblique directions, and the fit around the legs is significantly improved. As a result, it is effective for problems such as biting into the shoreline and buttocks of the wearer, which tend to be in the fastening type, and deterioration of the wearing feeling due to this, or lateral leakage due to contraction in the width direction of the abdominal part F and the back part B Can be suppressed.

  The belly side leg elastic elastic region 91 and the back leg elastic elastic region 92 made of the elastic nonwoven fabrics 12F and 12B may be formed of a non-elastic nonwoven fabric on the back side. The 2nd front-back direction area | region 82 can be formed with an integral nonwoven fabric. Further, in the illustrated example, the stretchable nonwoven fabrics 12F and 12B are provided over the entire width direction. As a result, the stretchable nonwoven fabrics 12F and 12B exist up to the non-stretchable portion overlapping the backsheet 11, but the backsheet 11 For the portion overlapping with the non-stretchable nonwoven fabric, the stretchable nonwoven fabrics 12F and 12B may be provided only on both sides of the backsheet 11 by exposing the backsheet 11 without providing anything.

Hereinafter, the material of each part will be further described.
(Exterior sheet)
The exterior sheet 12 is a part for supporting the main body part from the top sheet 30 to the back sheet 11 and being attached to the wearer. As described above, the exterior sheet 12 is formed by joining the stretchable nonwoven fabric and the non-stretchable nonwoven fabric in the front-rear direction. Is.

As an elastic nonwoven fabric which forms the 1st front-back direction area | region and the 2nd front-back direction area | region, what extends about 1.5 to 3 times in the vertical direction and a horizontal direction is preferable, and a longitudinal direction tensile strength and a horizontal direction tensile strength ( A sample having a width of 40 mm is preferably about 2 to 6 N / 40 mm when the sample is stretched at a stretching rate of 300 mm / min from a non-stretched state to a length twice as long as the length or width. The fiber basis weight of the stretchable nonwoven fabric is preferably about ²⁰ to 100 g / m2, and the thickness is preferably 1 mm or less. Although the manufacturing method of a nonwoven fabric is not specifically limited, The thing by an air through method, the spun bond method, and the spunlace method is preferable. The stretchable nonwoven fabric can be used alone, or a plurality of stretched nonwoven fabrics can be used.

As the non-stretchable nonwoven fabric forming the third front-rear direction region, using 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. , A known nonwoven fabric formed by a spunlace method, a spunbond method, a thermal bond method, an air-through method, a needle punch method or the like can be used, and its fiber basis weight is 8 to 30 g / m ² , particularly 10 to ²⁰ g / m ^2. It is preferable to set the degree. In particular, 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. The non-stretchable nonwoven fabric can be used alone, or a plurality of non-stretchable nonwoven fabrics can be used together.

(Back sheet)
The material of the back sheet 11 is not particularly limited as long as it is liquid-impermeable. For example, an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric in which a nonwoven fabric is laminated on a polyethylene sheet, or a waterproof film is interposed. For example, a non-woven fabric that is substantially liquid-impervious (in this case, the back sheet 11 is composed of a waterproof film and a non-woven fabric) can be exemplified. 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 back sheet 11.

(Surface 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.

  Further, the top sheet 30 may be composed of one sheet or may be composed of 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 topsheet 30 and the absorbent element 50 in order to move excrement that has passed through the topsheet 30 to the absorber and prevent reversal. This intermediate sheet 40 not only improves the absorption performance of the absorbent by quickly transferring the excrement to the absorber, but also prevents the excretion of the absorbed excrement from reversing from the absorber, and the surface of the top sheet 30 has a good touch. To do. The intermediate sheet 40 can be omitted.

  As the intermediate sheet 40, a known material such as a bulky nonwoven fabric or a perforated resin film can be used. The intermediate sheet 40 is preferably bonded to the top sheet 30. For the bonding, heat embossing or ultrasonic welding can be used in addition to the hot melt adhesive.

  The intermediate sheet 40 in the form shown in the figure is arranged at the center shorter than the width of the absorbent element 50, but it may be provided over the entire width, and the width may be narrower than the back sheet 11. 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.

(Three-dimensional gather)
In order to prevent urine and soft stool that move in the lateral direction along the top sheet 30 and prevent side leakage, the three-dimensional gathers 60, 60 that protrude (stand up) on the use surface side are provided on both sides of the product. preferable.

  The 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 located on the side portion of the back sheet 11 and on the outer side in the width direction. The sheet 12 is fixed to a side portion of the sheet 12 with a hot melt adhesive or the like, and forms a part of a side flap portion SF that extends to the side of the absorber 56.

  Around the legs, the width direction inner side of the solid gather 60 is fixed on the top sheet 30 at both ends in the front-rear direction of the product, but the portion between them is an unfixed free part. It stands up due to the contraction force of the rubber thread 63 and adheres closely to the legs. 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 from the outer side in the width direction to the inner side in the width direction, and 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.

  In particular, in the illustrated example, an elongated portion made of thread rubber or the like along the front-rear direction between the sheets of the portion where the gather sheet 62 and the exterior sheet 12 face each other on the outer side in the width direction in the vicinity of the fixing start end of the fixed portion of the gather sheet 62. The elastic elastic member 64 is clamped and fixed in an elongated state along the front-rear direction. By the elongated elastic elastic member 64, the side flap portion SF has a back side from or near the elastic elastic region 91 around the ventral leg. A region in or around the leg elastic expansion / contraction region 92 is an intermediate elastic expansion / contraction region 93. As described above, the side flap portion SF is divided into three regions in the front-rear direction, and a ventral leg elastic stretch region 91, a back leg elastic stretch region 92, and an intermediate elastic stretch region 93 connecting them are provided. Thus, it is possible to improve the fit to the entire circumference of the leg while suppressing the amount of the stretchable nonwoven fabrics 12F and 12B used.

  Further, in the illustrated example, the three-dimensional gather 60 is within the range in the front-rear direction of the intermediate elastic stretchable region 93 (that is, between the ventral leg elastic stretch region 91 and the back leg elastic stretch region 92). The front-rear length is shorter than the total length of the diaper, and the ventral leg elastic stretch region 91 and the back leg elastic stretch region 92 are located at the center in the width direction to the front side and the rear side of the three-dimensional gather 60, respectively. It is extended. In this way, the three-dimensional gather 60 is shortened so as to be within the range in the front-rear direction of the intermediate elastic stretchable region 93 and the ventral leg-around elastic stretchable region 91 and the vacant portions (the front side and the rear side of the three-dimensional gather 60) By extending the elastic expansion / contraction region 92 around the dorsal leg toward the center in the width direction, the region of the stretchable nonwoven fabrics 12F and 12B that can be expanded and contracted in all directions can be expanded toward the center in the width direction. The fit is even better.

(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 bonded to the inner surface of the back 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 40 seconds or less are preferably used. When the water absorption speed exceeds 40 seconds, so-called reversion in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 is likely to occur.

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 instead of the crepe paper, a hydrophilic SMMS (spunbond / meltblown / meltblown / spunbond) nonwoven fabric is particularly suitable, and polypropylene, polyethylene / polypropylene, etc. can be used as the material. The fiber basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .

  As shown in 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 surface and side surfaces of the absorber 56 are covered with crepe paper or nonwoven fabric, and the lower surface is covered with a back sheet such as polyethylene. The upper surface of the absorber 56 is covered with crepe paper or nonwoven fabric, and the side surfaces and lower surface are made of polyethylene. A form covered with a back sheet such as these may be used (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 and 2, the fastening tape 13 has a base portion of a sheet base material 13C made of a nonwoven fabric, a plastic film, a polylaminated nonwoven fabric, paper or a composite material thereof attached to the diaper and protrudes from the diaper. A hook material 13 </ b> A of a mechanical fastener is provided as a locking portion for the ventral side at the distal end side portion. The hook material 13A is joined to the sheet base 13C with an adhesive so as not to be peeled off.

  In the diaper for infants, among the dimensions of the attachment portion of the fastening tape 13, the width direction length X1 of the diaper is preferably 10 to 50 mm, particularly preferably 20 to 40 mm, and the length Y1 in the front-rear direction is 20 to 100 mm. In particular, the thickness is preferably 40 to 80 mm. Of the dimensions of the front end side portion of the fastening tape 13, the length of the diaper in the width direction is preferably 30 to 80 mm, particularly preferably 40 to 60 mm, and the length (height) in the front-rear direction is 20 to 70 mm. In particular, the thickness is preferably 25 to 50 mm. 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. The hook member 13A has a large number of engaging protrusions on the outer surface side. 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. Instead of the hook material 13 </ b> A, an adhesive material layer can be provided as a locking portion of the fastening tape 13.

  When the diaper is mounted, the fastening tape is locked at a proper position on the outer surface of the abdominal side F with the back side flap portion BF being overlapped on the outside of the abdominal side flap portion FF. 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 attachment portion of the fastening tape 13 overlaps the boundary line between the back end flap portion BE and the absorbent element 50, the tension acting between the attachment portions of the left and right fastening tapes 13 when the diaper is attached. This is preferable because the back side end of the absorbent element 50 is firmly pressed against 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 attachment parts of the left and right fastening tapes 13 when the diaper is mounted is the back side end part of the diaper. Therefore, 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 BE is preferably the same as or shorter than the length in the front-rear direction of the base portion of the fastening tape 13.

(Target sheet)
It is preferable to provide a target sheet 74 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 74, when the hook portion is the hook material 13 </ b> A, a target sheet 74 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 a nonwoven fabric so that the engagement protrusions of the hook material are tangled. 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 74 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 hooking surface 13A may be configured to be satisfactorily locked by subjecting the locking surface of the exterior sheet 12 to raising treatment, embossing, processing for forming slits or openings, and the like. In particular, when the hooking portion of the exterior sheet 12 is made of an elastic nonwoven fabric, a process that improves the strength, such as embossing, is preferable. Further, when the hook material 13A is entangled and locked with the nonwoven fabric of the exterior sheet 12, the target sheet 74 is provided between the exterior sheet 12 and the back sheet 11, and the locking position can be visually recognized by the target sheet 74. You may do it.

  Further, as in the illustrated example, when the target sheet 74 is attached to the stretchable nonwoven fabric 12F, it is difficult to secure the fixing strength of the target sheet 74, and therefore, a welding means such as heat sealing is used to increase the amount of adhesive. By doing so, it is preferable to fix the target sheet 74 not only to the stretchable nonwoven fabric 12F but also to the inner member, that is, the back sheet 11 in the illustrated example.

(Back elastic sheet)
In the illustrated form, a belt-like back-side elastic sheet 70 that elastically expands and contracts in the width direction is provided between the fastening tapes 13 to improve the fit in the diaper back side. Both end portions of the back-side elastic sheet 70 are preferably extended to a portion that overlaps with the attachment portions of both fastening tapes 13, but may be separated to the center in the width direction. The back-and-forth stretchable sheet 70 has a front-rear dimension that is approximately the same as the front-rear dimension of the attachment portion of the fastening tape 13, but may have a dimensional difference of about ± 20%.

  Moreover, although it is preferable that the both ends of the back side elastic sheet 70 are extended to the site | part which overlaps with the elastic expansion-contraction area | region 92 around the left and right back side legs, you may space apart in the width direction center side.

  Further, as shown in the figure, when the back elastic sheet 70 is arranged so as to overlap the boundary line between the back end flap BE and the absorber 56, the back end of the absorber 56 is firmly pressed against the body. Therefore, it is preferable. The back-side elastic sheet 70 may use a sheet-like elastic member such as a rubber sheet, but it is preferable to use a nonwoven fabric or paper from the viewpoint of air permeability. In this case, a sheet-like elastic member having air permeability such as a stretchable nonwoven fabric can be used. However, as shown in FIG. 5, the sheet base material 71 such as two nonwoven fabrics is bonded with an adhesive such as a hot melt adhesive. Preferably, the elastic stretch member 72 such as a perforated sheet, net, or elongated (thread or string) is fixed in a stretched state in the width direction between the sheet bases 71. Used. As the sheet base 71 in this case, the same one as the exterior sheet 12 can be used. The elastic stretch member 72 preferably has an elongation rate (meaning a value when the natural length is 100%) of about 150 to 250%. In addition, when an elongated (stretch or string-like) member is used as the elastic elastic member 72, it is preferable to provide about 5 to 15 members having a thickness of 420 to 1120 dtex at intervals 72d of 3 to 10 mm.

  Further, as shown in the drawing, it is preferable that a part of the elastic expansion / contraction member 72 is arranged so as to cross the absorber 56, because the fit of the absorber 56 is improved. In this case, the elastic expansion / contraction member 72 is used as the absorber 56. If the contraction force is prevented from acting on a part or all of the overlapping portion by means such as cutting, the back end portion of the absorbent body 56 does not contract in the width direction, so that the fit is further improved.

  The elastic elastic member 72 may be fixed over the entire length of the sheet base material 71 in the longitudinal direction of the sheet (width direction of the diaper), but in order to prevent the sheet from shrinking or curling when attached to the diaper body, In the range of about 5 to 20 mm at the end in the front-rear direction (diaper width direction), it is preferable that the contraction force does not work or the elastic elastic member 72 does not exist.

  In the illustrated embodiment, the back-side stretchable sheet 70 is sandwiched between the stretchable nonwoven fabrics 12 </ b> B on both sides in the width direction of the backsheet 11, and is sandwiched between the backsheet 11 and the absorbent element 50 at a portion overlapping the backsheet 11. However, it may be provided between the back sheet 11 and the exterior sheet 12, may be provided on the outer surface of the exterior sheet 12, or may be provided between the top sheet 30 and the absorbent element 50. Good. Further, when the exterior sheet 12 is formed by stacking a plurality of sheet base materials, the entire back-side stretchable sheet 70 may be provided between the sheet base materials of the exterior sheet 12.

  The present invention is applicable to a fastening type disposable diaper.

  DESCRIPTION OF SYMBOLS 11 ... Back sheet, 12 ... Exterior sheet, 12F, 12B ... 3 stretchable nonwoven fabric, 30 ... Surface sheet, 40 ... Intermediate sheet, 50 ... Absorbing element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Solid gather, 62 ... Gather sheet, 70 ... dorsal elastic sheet, 74 target sheet, 91 ... elastic elastic region around the ventral leg, 92 elastic elastic region around the dorsal leg, 93 intermediate elastic elastic region.

Claims (3)

Having a crotch part, a ventral part extending to the front side of the crotch part, and a dorsal part extending to the rear side of the crotch part,
An absorbent body extending along the center in the width direction from the ventral part to the back part, a liquid-permeable top sheet covering the front side of the absorbent body, and a back sheet covering the back side of the absorbent body,
Locked against the outer surface of the ventral part provided on the pair of left and right side flaps extending from the ventral part to the dorsal part on both sides of the absorber, and the left and right side flaps of the dorsal part And a locking portion to be
Both side edges of the back sheet are located on the outer side in the width direction than both side edges of the top sheet, and are located in the middle in the width direction of the side flap part, respectively.
On the side edges of both side flap portions of the intermediate region in the front-rear direction extending from the dorsal side portion to the ventral side portion, there is a leg periphery edge constricted along the periphery of the leg,
Of the side flap portion, the region including at least a part of the leg periphery edge of the ventral portion in the front-rear direction and including the side edge of the backsheet to the side edge of the diaper in the width direction is made of stretchable nonwoven fabric. The elastic region around the ventral leg,
Fastening type disposable diaper characterized by that. Of the side flap portion, an area including a lengthwise middle position of a leg periphery edge at the ventral portion in the front-rear direction to a waist edge and a region including the side edge of the backsheet to the side edge of the diaper in the width direction are expanded and contracted. It is an elastic stretch area around the ventral leg made of nonwoven fabric,
Of the side flap portion, a region including a lengthwise middle position of a leg periphery edge in the back side portion in the front-rear direction to a waist edge, and a region including the side edge of the backsheet to the side edge of the diaper in the width direction is stretchable. It is an elastic stretch area around the back leg made of non-woven fabric,
Of the side flap portion, the elongated elastic elastic member extends along the front-rear direction in the elastic elastic region around the ventral leg or in the vicinity thereof to the elastic elastic region around the back leg or in the vicinity thereof. It is the middle part elastic stretchable area fixed with
The fastening type disposable diaper according to claim 1. It has a base end portion fixed to the inner surface side of the intermediate elastic stretchable region and an effect portion extending from the base end portion, and the front and rear end portions of the extension portion are fixed portions that do not stand up. A non-fixed free part is formed so as to stand between the fixed parts, and an elongated elastic elastic member is fixed to the free part in a stretched state along the front-rear direction. With a three-dimensional gather that fits within the range,
The ventral leg elastic stretch region and the back leg elastic stretch region extend to the center side in the width direction to the front side and the rear side of the three-dimensional gather, respectively.
The fastening type disposable diaper according to claim 2.