JP2018050913A5 - - Google Patents

Description

Disposable diapers

  The present invention relates to a disposable diaper provided with an indicator that enables the presence or absence of excretion of urine or the like to be visually recognized from the outside by coloring.

  Many disposable diapers for infants are provided with an indicator that allows the presence or absence of excretion of urine or the like to be visually recognized from the outside by coloring or decoloring (see, for example, Patent Documents 1 and 2). The user can recognize that there is excretion by visually recognizing the coloration (coloring or discoloration) or decoloring of the indicator from the outside while wearing the disposable diaper, and can use it as a guideline for changing the diaper. There is an advantage.

  Since such an indicator is hidden behind the absorber and may not change color with a small amount of urination, a slit that is a portion penetrating in the thickness direction is formed in a portion overlapping the indicator in the absorber. It has been proposed to promote urine supply (see Patent Documents 1 and 2).

  However, since the slit portion is excellent in air permeability, there is a problem that the indicator easily comes into contact with moisture in the air, and the entire portion is thinly or sparsely discolored even before urination. For this reason, as a solution to this problem, it has been proposed that the position of the indicator is not overlapped with the slit and is arranged near the side edge of the slit and covered with an absorber (see, for example, Patent Documents 3 and 4). ).

  In the structures of these preceding examples, it is preferable to be as close as possible to the side edge of the slit from the viewpoint of easy discoloration of the indicator during urination (effective discoloration even with a small amount of urination).

  However, the closer to the slit, the easier it is to supply moisture to the indicator. In particular, since the superabsorbent polymer contained in the absorber has high hygroscopicity, the superabsorbent polymer in the vicinity of the slit on the back surface of the absorber absorbs moisture and gels due to storage under high humidity and long-term storage. The moisture contained in the gelled superabsorbent polymer may come into contact with the indicator and the indicator may be discolored before use.

JP 2012-223230 A JP-A-2015-195828 JP 2010-074464 A1 JP2012-223231A

  Then, the main subject of this invention is providing the disposable diaper provided with the indicator which is hard to discolor before use by moisture absorption of a superabsorbent polymer, although it is excellent in the discoloration ease at the time of urination.

The typical embodiments of the present invention that have solved the above problems are as follows.
<First aspect>
An absorber provided in the front-rear direction range including the crotch part;
A liquid-permeable top sheet covering the front side of the absorber;
A liquid-impermeable sheet covering the back side of the absorber;
A slit provided in the absorber, extending in the front-rear direction;
An indicator that is provided between the absorber and the liquid-impermeable sheet, and changes color due to contact with the liquid content of excrement;
With
The absorber includes a fiber assembly and superabsorbent polymer particles, and includes at least the superabsorbent polymer particles at the bottom.
In disposable diapers,
The indicator is entirely overlapped with the non-slit portion located on the side of the slit, and part or all of the indicator is located at the end of the non-slit portion on the slit side,
Superabsorbent polymer particles are interspersed at the bottom of the slit of the absorber, or a superabsorbent polymer particle layer is provided,
A disposable diaper characterized by that.

(Function and effect)
When the slit is formed in the absorber as described above, even if a small amount of urine is passed, it passes through the slit and diffuses in the front-rear direction, and is supplied to the back side of the non-slit portion near the side edge of the slit. Therefore, if the entire indicator overlaps with the non-slit portion located on the side of the slit, and part or all of the indicator is located at the end of the non-slit portion on the slit side, a small amount of urination occurs. Even if it is, urine is supplied to the indicator and discoloration occurs.

  Further, as described above, when the superabsorbent polymer particles are interspersed at the bottom of the slit of the absorber or the superabsorbent polymer particle layer is provided, the moisture in the slit is superabsorbent at the bottom. Preferentially absorbed by the polymer particles. As a result, the superabsorbent polymer particles at the bottom of the slit are sacrificed, and the supply of moisture via the slit is suppressed to the superabsorbent polymer particles and the indicator located on the side of the slit. In addition, if the superabsorbent polymer particles and the indicator overlap, when the superabsorbent polymer particles absorb moisture and become a gel, the moisture is supplied to the indicator, and the indicator may be discolored. In the present invention, since the indicator is not disposed at the portion overlapping the slit, such discoloration is also prevented.

<Second aspect>
The widthwise interval between the side edge of the slit and the side edge of the indicator adjacent to the slit is 1 to 5 mm.
The disposable diaper of a 1st aspect.

(Function and effect)
As described above, when the slit and the indicator are arranged very close to each other, the discoloration at the time of urination is particularly excellent. On the other hand, discoloration is likely to occur before use due to moisture absorption of the superabsorbent polymer. Therefore, the present invention is particularly meaningful when applied to such a form.

<Third Aspect>
In the part having the slit, the members adjacent to both sides of the absorber are not joined,
The basis weight of the superabsorbent polymer particles located in the slit is 100 to 300 g / m ² .
The disposable diaper of the 1st or 2nd aspect.

(Function and effect)
It is preferable that the members adjacent to both the front and back sides of the absorber are not joined to each other at the part having the slit because diffusion of urine is promoted by the slit on the back side of the top sheet. However, when the inside of the slit is a space, the slit becomes a crack in the absorber during absorption expansion of the absorber, and the absorber may collapse. Such collapse of the absorbent body is not preferable because it may cause leakage or deteriorate the feeling of wearing. On the other hand, as described above, when the superabsorbent polymer particles are provided to some extent at the bottom of the slit, the superabsorbent polymer expands in the slit after urination and can be prevented from collapsing from the slit portion.

<Fourth aspect>
The disposable diaper according to any one of the first to third aspects, wherein the indicator is formed in an intermittent pattern in the front-rear direction.

(Function and effect)
If the indicator is provided in an intermittent pattern in the front-rear direction, even if some of the indicator absorbs moisture before use and discolors, it is difficult for moisture to be transmitted to other parts. You can know that there was. In the present invention, since the urine is easily diffused in the front-rear direction by the slit, even if the indicator is provided in an intermittent pattern in the front-rear direction, the urine is easily supplied to the indicator at the time of urination. Discoloration is possible.

<Fifth aspect>
Covering the back side of the liquid-impermeable sheet, and having a cover nonwoven fabric that forms a product outer surface in at least a part of the portion covering the liquid-impermeable sheet,
In the region including the portion overlapping the indicator in the cover nonwoven fabric, a number of holes penetrating the front and back are provided at intervals,
The hole is not provided in a region including a portion overlapping the slit in the cover nonwoven fabric,
The disposable diaper of any one aspect of the 1st-4th.

(Function and effect)
In the disposable diaper, a cover nonwoven fabric made of a nonwoven fabric is provided on the outer side of the liquid-impermeable sheet in order to make the outer surface feel and appearance like a cloth. As the cover nonwoven fabric, a non-porous nonwoven fabric is widely used, but it is also known to use a perforated nonwoven fabric that has perforated holes to provide air permeability that is greater than the fiber gap. However, when a perforated nonwoven fabric is used in a form having slits in the absorbent body, it is easy to feel dampness when touching the outer surface of the disposable diaper, which may cause discomfort. On the other hand, when a perforated nonwoven fabric is used in a form having an indicator, there is an advantage that the color change of the indicator can be visually recognized more clearly at the portion where the indicator and the hole overlap. Therefore, in order to achieve both of these, as for the region including the portion overlapping the indicator, such as the above-described cover nonwoven fabric, the region including a portion overlapping with the slit is provided with many holes penetrating the front and back. It is preferable not to provide holes.

<Sixth aspect>
The non-slit portion of the absorbent body is a mixed fiber of pulp fibers and superabsorbent polymer particles, and contains superabsorbent polymer particles of 50% or more by weight ratio to the pulp fibers.
The disposable diaper of any one aspect of 1st-5th.

(Function and effect)
Thus, when the ratio of the superabsorbent polymer particles in the non-slit portion of the absorber is high, the superabsorbent polymer in the vicinity of the slit on the back surface of the absorber is likely to absorb moisture, and there is a high possibility that the indicator is discolored before use. Therefore, the present invention is particularly meaningful when applied to such a form.

<Invention of Claim 7>
The absorbent body is wrapped in a packaging sheet,
The indicator is a hot melt adhesive containing a discoloring substance that changes color by contact with the liquid content of excrement, and is adhered to the packaging sheet and the liquid impermeable sheet.
The disposable diaper according to any one of the first to sixth aspects.

(Function and effect)
Such a disposable diaper structure is widely adopted, but the present invention is particularly significant in such a disposable diaper.

  As described above, according to the present invention, although it is excellent in ease of discoloration during urination, it is advantageous in that it is difficult to discolor before use due to moisture absorption of the superabsorbent polymer.

It is an expanded state top view which shows the inner surface of a pants type disposable diaper. It is an expanded state top view which shows the outer surface of a pants type disposable diaper. FIG. 3 is a 3-3 cross-sectional view of FIG. 1. FIG. 4 is a sectional view taken along the line 4-4 in FIG. 1. (A) 5-5 sectional drawing of FIG. 1, (b) 6-6 sectional drawing of FIG. It is a perspective view of a pants type disposable diaper. It is an expanded state top view which shows the outer surface of a pants type disposable diaper. (A) 5-5 sectional drawing of FIG. 7, (b) 6-6 sectional drawing of FIG. It is an expanded state top view which shows the outer surface of a pants type disposable diaper. It is 3-3 sectional drawing of FIG. It is an expanded state top view which shows the outer surface of a pants type disposable diaper. It is 3-3 sectional drawing of FIG. It is (a) perspective view, (b) top view, and (c) 1-1 sectional view which show the hole of an exterior sheet. It is (a) perspective view, (b) top view, and (c) 1-1 sectional view which show the hole of an exterior sheet. It is (a) perspective view, (b) top view, and (c) 1-1 sectional view which show the hole of an exterior sheet. It is a principal part enlarged plan view of an exterior sheet.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1 to 6 show an example 100 of a pants-type disposable diaper. The dotted pattern in the cross-sectional view shows an adhesive as a joining means for joining the constituent members located on the front side and the back side, and is a solid, bead, curtain, summit or spiral coating of hot melt adhesive, or pattern coating (Transfer of hot melt adhesive in a relief printing system) or the like, or the fixed portion of the elastic stretchable member is formed by application to the outer peripheral surface of an elastic stretchable member such as a comb gun or a shroud coating instead of or together with this Is. Examples of hot melt adhesives include EVA, adhesive rubber (elastomer), olefin, and polyester / polyamide types, which can be used without any particular limitation. As a joining means for joining the constituent members, means by material welding such as heat sealing or ultrasonic sealing can be used.

  The pants-type disposable diaper 100 of the present embodiment extends from the front exterior body 12F constituting the front body F and the rear exterior body 12B constituting the rear body B and from the front exterior body 12F to the rear exterior body 12B through the crotch part. The exterior body 12F and 12B are provided inside the exterior body 12F, and both side portions of the front exterior body 12F and both side portions of the rear exterior body 12B are joined to form the side seal portion 12A. By being formed, the opening formed by the front and rear ends of the exterior bodies 12F and 12B becomes a waist opening WO through which the wearer's torso passes, and the lower edges of the exterior bodies 12F and 12B on both sides in the width direction WD of the interior body 200 And the part each enclosed by the side edge of the interior body 200 becomes the leg opening part LO which lets a leg pass. The interior body 200 is a portion that absorbs and holds excrement such as urine, and the exterior bodies 12F and 12B are portions that support the interior body 200 with respect to the wearer's body. The symbol Y indicates the total length of the diaper in the deployed state (the length in the front-rear direction from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the back body B), and the symbol X indicates the diaper in the deployed state. The full width of is shown.

  Moreover, the pants-type disposable diaper 100 of this embodiment forms a waist region T defined as a front-rear direction range (a front-rear direction range extending from the waist opening WO to the upper end of the leg opening LO) having the side seal portion 12A, and a leg opening LO. And an intermediate region L defined as a front-rear direction range (between the front-rear region having the side seal portion 12A of the front body F and the front-rear region having the side seal portion 12A of the rear body B). The waistline region T can be divided into a “waist portion” W that conceptually forms the edge of the waist opening and a “waist lower portion” U that is a lower portion than this. Normally, when the waist region WO has a boundary in which the stretching stress in the width direction LD changes (for example, the thickness or elongation rate of the elastic stretch member changes), the waist opening WO side is more than the waist opening WO side boundary. When it becomes the waist part W and there is no such boundary, the waist opening WO side becomes the waist part W rather than the absorber 56 or the interior body 200. These lengths in the front-rear direction LD vary depending on the size of the product and can be determined as appropriate. For example, the waist portion W can be 15 to 40 mm and the waist lower portion U can be 65 to 120 mm. On the other hand, both side edges of the intermediate region L are wrapped in a U-shape or a curved shape along the circumference of the leg of the wearer, and this is a portion into which the wearer's leg is put. As a result, the unfolded pants-type disposable diaper has a substantially hourglass shape as a whole.

(Interior body)
The interior body 200 can take any shape, but is rectangular in the illustrated form. As shown in FIGS. 3 to 5, the interior body 200 includes a top sheet 30 on the body side, a liquid-impermeable sheet 11, and an absorbent element 50 interposed therebetween. Yes, it is the main body that takes up the absorption function. Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent element 50. These show the three-dimensional gathers 60 which stand on the body side and which are provided on both sides of the interior body 200 in order to prevent excrement from leaking to both sides of the width direction WD of the interior body 200.

  The interior body 200 can be fixed to the exterior bodies 12F and 12B by a joining means by material welding such as heat sealing or ultrasonic sealing, or by a hot melt adhesive. In the illustrated embodiment, the inner surface of the exterior body 12F, 12B is fixed by the hot melt adhesive applied to the back surface of the interior body 200, that is, the back surface of the liquid-impermeable sheet 11 and the mounting portion 65 of the three-dimensional gather 60 in this case. Has been. The inner and outer fixing portions 201 for fixing the inner body 200 and the outer bodies 12F and 12B can be provided in almost the entire region where both overlap, and are usually provided in a portion excluding both ends in the width direction of the inner body. preferable.

(Top sheet)
The top sheet 30 has a property of allowing liquid to pass through, and examples thereof include a porous or non-porous nonwoven fabric, a porous plastic sheet, and the like. 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, if flexibility and drapeability are required, the spunbond method and spunlace method are preferable. If bulkiness and softness are required, the air-through method, point bond method, and thermal bond method are preferable processing methods. .

  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.

  In the case of providing the three-dimensional gather 60, both sides of the top sheet 30 pass between the liquid-impermeable sheet 11 and the three-dimensional gather 60 to reach the back side of the absorbent element 50, in order to prevent liquid penetration. It is preferable to join to the permeable sheet 11 and the three-dimensional gather 60.

  For the purpose of preventing displacement of the top sheet 30 with respect to the back side member, the top sheet 30 is preferably fixed to a member adjacent to the back side by a joining means by material welding such as heat sealing or ultrasonic sealing, or a hot melt adhesive. . In the illustrated form, the top sheet 30 is fixed to the surface of the intermediate sheet 40 and the surface of the packaging sheet 58 on the front side of the absorbent body 56 by a hot melt adhesive applied to the back surface thereof.

(Intermediate sheet)
An intermediate sheet (also referred to as “second sheet”) 40 having a higher liquid permeation rate than the top sheet 30 can be provided in order to quickly transfer the liquid that has permeated through the top sheet 30 to the absorber. This intermediate sheet 40 not only improves the absorption performance by the absorbent by quickly transferring the liquid to the absorbent body, but also prevents the “reversed” phenomenon of the absorbed liquid from the absorbent body, so that the top sheet 30 is always dried. It can be made into the state which carried out. The intermediate sheet 40 can be omitted.

Examples of the intermediate sheet 40 include the same materials as the top sheet 30, spunlace, spunbond, SMS, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond, or crepe paper. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. Basis weight is preferably ^{17~80g / m 2, 17~60g / m} 2 is more preferable. The thickness of the raw fiber of the nonwoven fabric is preferably 1.5 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use an eccentric fiber, a hollow fiber, or an eccentric and hollow fiber that does not have a core at the center as the mixed fiber of all or part of the raw fiber.

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

  The intermediate sheet 40 is preferably fixed to a member adjacent to the back side by a joining means by material welding such as heat sealing or ultrasonic sealing, or a hot melt adhesive for the purpose of preventing positional displacement with respect to the back side member. . In the illustrated embodiment, the intermediate sheet 40 is fixed to the surface of the portion of the packaging sheet 58 located on the front side of the absorbent body 56 with a hot melt adhesive applied to the back surface thereof.

(Liquid impervious sheet)
The material of the liquid-impermeable sheet 11 is not particularly limited. For example, a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric provided with a plastic film on the surface of the nonwoven fabric, or a plastic film For example, a laminated sheet in which a nonwoven fabric or the like is laminated and bonded to each other can be exemplified. For the liquid-impermeable sheet 11, it is preferable to use a liquid-impervious and moisture-permeable material that is preferably used from the viewpoint of preventing stuffiness. As a plastic film having moisture permeability, a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching in a uniaxial or biaxial direction. Is widely used. In addition, non-woven fabric using microdenier fiber, enhancement of leakproofness by reducing the voids of the fiber by applying heat or pressure, application of superabsorbent resin or hydrophobic resin or water repellent Thus, a sheet that is liquid-impermeable without using a plastic film can also be used as the liquid-impermeable sheet 11.

  The liquid-impermeable sheet 11 has a width that can be accommodated on the back side of the absorbent element 50 as shown in the drawing, and in order to improve leakage prevention, the liquid-impermeable sheet 11 wraps around both sides of the absorbent element 50 so that It can also extend to both sides. The width of this extended portion is suitably about 5 to 20 mm on each of the left and right sides.

  In addition, an indicator whose color is changed by absorption of the liquid component can be provided on the inner side of the liquid-impermeable sheet 11, particularly on the side of the absorber 56.

(Three-dimensional gather)
The three-dimensional gather 60 is a belt-like member that extends along the both sides of the interior body 200 in the front-rear direction LD, blocks excrement that travels in the lateral direction along the top sheet 30, and prevents lateral leakage. It is provided to do. The three-dimensional gather 60 of the present embodiment is provided so as to stand up from the side portion of the interior body 200, the base side portion rises obliquely toward the center in the width direction, and the tip side portion from the intermediate portion has a width. It stands up diagonally outward in the direction.

  More specifically, the three-dimensional gather 60 folds the belt-shaped gather sheet 62 having a length equal to the length in the front-rear direction of the interior body 200 in the width direction WD and folds it into two. In the meantime, a plurality of elongated gather elastic elastic members 63 are fixed along the longitudinal direction at intervals in the width direction WD while being elongated along the longitudinal direction. A base end portion (an end portion on the side opposite to the sheet folding portion in the width direction WD) located on the opposite side to the front end portion of the three-dimensional gather 60 is an attachment portion 65 fixed to the back surface of the side edge portion of the interior body 200. The portions other than the attachment portion 65 are projecting portions 66 (parts on the folded portion side) that protrude from the attachment portion 65. The projecting portion 66 includes a base side portion that extends toward the center in the width direction, and a tip side portion that is folded back outward in the width direction from the tip of the base side portion. This form is a surface contact type three-dimensional gather, but a line contact type three-dimensional gather (not shown) that is not folded outward in the width direction can also be employed. And while the both ends of the front-back direction LD among the protrusion parts 66 are made into the front-back fixing | fixed part 67 fixed with respect to the side part surface of the top sheet 30 in the lying state, on the front-back direction LD located between these The intermediate portion is a non-fixed free portion 68, and a gather elastic elastic member 63 along the front-rear direction LD is fixed to the free portion 68 in an extended state.

  In the free portion 68 of the three-dimensional gather 60, hot melt adhesives and heat seals and super seals by various coating methods are used to bond the inner layer and the outer layer of the gather sheet 62 and to fix the gather elastic elastic member 63 sandwiched therebetween. At least one of fixing means by material welding such as a sonic seal can be used. Since the flexibility is lost when the entire inner layer and outer layer of the gather sheet 62 are bonded together, it is preferable that the portions other than the bonding portion of the gather elastic elastic member 63 are not bonded or weakly bonded. In the illustrated embodiment, a hot melt adhesive is applied only to the outer peripheral surface of the gather elastic stretchable member 63 by an application means such as a comb gun or a sure wrap nozzle, and is sandwiched between the inner layer and the outer layer of the gather sheet 62, thereby collecting the gather elastic stretch. A structure in which the elongated elastic elastic member is fixed to the inner layer and the outer layer of the gather sheet 62 and the inner layer and the outer layer of the gather sheet 62 are fixed only by the hot melt adhesive applied to the outer peripheral surface of the member 63. It has become.

  Also, hot melt adhesives and heat seals by various application methods are used for fixing the waterproof film 64 and the gather sheet 62 incorporated in the three-dimensional gather 60 and fixing the front and rear fixing portion 67 to the side surface of the interior body 200. Or at least one of means by material welding such as ultrasonic sealing can be used. In the illustrated embodiment, slot application of hot melt adhesive is used for fixing the waterproof film 64. Further, in the illustrated embodiment, the front and rear fixing portion 67 is fixed by combining hot melt adhesive and material welding means, but these can be fixed only by any one of the means.

The gather sheet 62 is made of a spunbond nonwoven fabric (SS, SSS, etc.), an SMS nonwoven fabric (SMS, SSMMS, etc.), a melt-blown nonwoven fabric with excellent uniformity and concealment, and water repellent with silicone if necessary. A treated product can be suitably used, and the fiber basis weight is preferably about 10 to 30 g / m ² . As the elongated elastic elastic member 63, rubber thread or the like can be used. When spandex thread rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate at the time of fixation is preferably 150 to 350%, more preferably 200 to 300%. The term “elongation rate” means a value when the natural length is 100%. Further, as shown in the drawing, a waterproof film 64 can be interposed between the gather sheets folded in two.

  2-6 are preferable and, as for the number of the elongate elastic expansion-contraction members 63 provided in the free part of the three-dimensional gather 60, 3-5 are more preferable. The arrangement interval 60d is suitably 3 to 10 mm. If comprised in this way, in the range which has arrange | positioned the elongate elastic expansion-contraction member 63, it will become easy to contact | abut with respect to skin. The elongated elastic elastic member 63 may be disposed not only at the distal end side but also at the base side.

  The fixing target of the attachment portion 65 of the three-dimensional gather 60 can be an appropriate member such as the top sheet 30, the liquid-impermeable sheet 11, the absorbent element 50 in the interior body 200.

  In the three-dimensional gather 60 thus configured, the contraction force of the elongated elastic elastic member 63 acts so that both ends of the front-rear direction LD are brought close to each other, but the protrusion 66 is fixed so that both ends of the front-rear direction LD do not stand up. On the other hand, since they are non-fixed free portions, only the free portions stand up against the body as shown in FIG. In particular, when the attachment portion 65 is positioned on the back surface side of the interior body 200, the three-dimensional gather 60 stands up so as to open outward in the width direction at the crotch portion and in the vicinity thereof. It comes in contact, and the fit is improved.

  The dimensions of the three-dimensional gather 60 can be determined as appropriate, but in the case of an infant paper diaper, for example, as shown in FIG. 3, the standing height of the three-dimensional gather 60 (the length in the width direction of the protruding portion 66 in the unfolded state) W6 is It is preferably 15 to 60 mm, particularly 20 to 40 mm. In addition, the distance W3 between the folds located on the innermost side in a state where the three-dimensional gather 60 is folded flat so as to be parallel to the surface of the top sheet 30 is preferably 60 to 190 mm, particularly preferably 70 to 140 mm.

  Note that, unlike the illustrated embodiment, the three-dimensional gathers can be provided in double (two rows) on the left and right sides of the interior body 200.

(Absorption element)
The absorbent element 50 includes an absorbent body 56 and a packaging sheet 58 that wraps the entire absorbent body 56. The packaging sheet 58 can be omitted.

(Absorber)
The absorber 56 includes superabsorbent polymer particles in the fiber assembly. As fiber aggregates, there are filament aggregates obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate and other short fibers such as cotton pulp and synthetic fibers. Can 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. It is preferable to disperse and hold superabsorbent polymer particles in the absorber 56.

  The absorber 56 may have a rectangular shape, but as shown in FIGS. 1 and 2, the front end portion, the rear end portion, and a constricted portion having a narrower width than the front end portion and the rear end portion are located between them. It is preferable to form an hourglass shape having the shape because the fit of the absorbent body 56 and the three-dimensional gather 60 around the legs is improved.

  Further, the size of the absorbent body 56 can be appropriately determined as long as it extends to the front, rear, left, and right of the urination port position, but preferably extends to the peripheral portion of the interior body or the vicinity thereof in the front-rear direction LD and the width direction WD. . Reference numeral 56X indicates the width of the absorber 56.

(slit)
In the front-rear direction range including the crotch portion of the absorbent body 56, a slit 54 having a predetermined width penetrating in the thickness direction extends in the front-rear direction LD in order to improve liquid diffusibility in the front-rear direction LD. As long as the slit 54 is provided in the crotch part, the length of the front-rear direction LD is not particularly limited. Therefore, the slit 54 may be provided over the entire front-rear direction LD of the absorber 56. It is desirable to extend from the front side to the rear side. More specifically, when the front end of the absorber 56 is 0% and the rear end of the absorber 56 is 100%, the front end of the slit 54 is preferably located in a range of 10 to 30%. The rear end of 54 is preferably located in the range of 40-80%.

  The width 54W of the slit 54 is not particularly limited as long as the opposing side walls are separated from each other. However, in a normal case, the width 54W is desirably about 3 to 15% of the minimum width 56M of the constricted portion 53 of the absorber 56. In particular, in the case of a product for infants, it can be set to about 7 to 13 mm.

  The number of the slits 54 is not particularly limited, and one slit is provided at the center in the width direction WD as in the embodiments shown in FIGS. 2 and 7, and instead, on the left and right sides as in the embodiments shown in FIGS. 9 to 12. One of each can be provided. When a plurality of slits 54 are provided at intervals in the width direction WD, it is preferable that the positions in the width direction of the slits 54 are symmetrical, and the width direction interval 54d of the slits 54 is the minimum width of the constricted portion 53 of the absorber 56. It can be made about 10 to 60% of 56M.

  In addition to the form extending linearly along the front-rear direction LD as shown in the figure, the slits 54 are provided at least in the front-rear direction as shown in FIG. It can be bent so that the distance between the slits 54 increases toward the one side. In the illustrated embodiment, the front and rear ends of the slit 54 do not penetrate the peripheral edge of the absorber 56, but at least one of the front and rear ends may reach the peripheral edge of the absorber 56. In the form in which the front and rear ends of the slit 54 reach the side edges of the absorber 56, the portion on the side of the slit 54 is separate from the portion between the slits 54.

(Superabsorbent polymer particles)
The non-slit portion of the absorbent body 56 contains a mixture of superabsorbent polymer particles at least at the bottom, preferably the whole. Superabsorbent polymer particles include “powder” in addition to “particles”. As the superabsorbent polymer particles, those used in this type of absorbent article can be used as they are, for example, by sieving (shaking for 5 minutes) using a 500 μm standard sieve (JIS Z8801-1: 2006). The proportion of particles remaining on the top is preferably 30% by weight or less, and the proportion of particles remaining on the screen by sieving (shaking for 5 minutes) using a 180 μm standard sieve (JIS Z8801-1: 2006) 60% by weight or more is desirable.

  The material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption (JIS K7223-1996 “Test method for water absorption of superabsorbent resin”) of 40 g / g or more are preferable. 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 absorbent body 56 tends to cause a so-called reversal that returns to the outside of the absorbent body 56.

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

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

  The ratio of the fibers and the superabsorbent polymer particles in the absorbent body 56 is not particularly limited, but when the weight ratio of the fibre: superabsorbent polymer particles is 50:50 to 20:80, the comparison is made with the same area and the same amount of absorption. A thinner absorber 56 can be obtained. In this case, the thickness 56t of the absorber 56 is not particularly limited, but can be 3 to 15 mm.

  The content of the superabsorbent polymer particles can be changed in the thickness direction of the absorber 56. In particular, if the content (weight percentage) of the superabsorbent polymer particles in the absorbent body 56 is increased stepwise or continuously from the back side to the front side, the liquid content of excreta entering the absorbent body 56 side. This is an excellent anti-reverse property known as a phenomenon of returning to the skin side. Of course, depending on the purpose, the content of the superabsorbent polymer particles in the absorber 56 is increased stepwise or continuously from the front side to the back side, or stepwise or continuous from the front and back sides toward the middle in the thickness direction. Can also be increased. Note that the content ratio of the superabsorbent polymer particles changes stepwise means that a plurality of layers having different content ratios are stacked and the content ratio is almost constant in each layer, and changes continuously. This means that there is no layer structure in which the content rate changes stepwise. In addition, the content of the superabsorbent polymer particles in the absorber 56 is “in a stepwise or continuously high” means that the absorber includes the superabsorbent polymer particles in the entire thickness direction of the absorber. It includes a form having a layer (a layer having a content rate of 0) that does not contain the superabsorbent polymer particles on either one of the front and back sides, and the content rate increasing from there.

(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 SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material can be polypropylene, polyethylene / polypropylene composite material, or the like. The basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .

  The packaging form of the packaging sheet 58 can be determined as appropriate, but from the viewpoint of ease of manufacture and prevention of leakage of the superabsorbent polymer particles from the front and rear end edges, the cylinder is formed so as to surround the front and back surfaces and both side surfaces of the absorbent body 56. It is preferable that the front and rear edge portions protrude from the front and rear of the absorbent body 56, and the overlapping portion and the overlapping portion of the front and rear protruding portions are joined by a joining means such as hot melt adhesive or material welding.

(Exterior body)
The exterior bodies 12F and 12B include a front exterior body 12F that is a part constituting the front body F and a rear exterior body 12B that is a part constituting the rear body B. The front exterior body 12F and the rear exterior body 12B Are not continuous on the crotch side and are spaced apart in the front-rear direction LD. This separation distance 12d can be about 150 to 250 mm. A part of the exposed portion of the back surface of the interior body 200 in this separated portion (for example, the entire portion in the front-rear direction LD of the portion exposed between the front exterior body 12F and the rear exterior body 12B, but to the front and rear ends of the interior body 200 It is desirable that the crotch portion cover sheet 12M made of a nonwoven fabric or the like is pasted so as not to extend and to cover the entire side edge of the interior body 200). . Moreover, as shown in FIG.7 and FIG.8, the exterior body 12 can also be made into the integrated body which continues between crotches from the front body F to the back body B. That is, the exterior bodies 12F and 12B that individually configure the front body F and the back body B correspond to the former form, and the exterior body 12 that integrally configures the front body F and the back body B corresponds to the latter form. .

  The exterior bodies 12 </ b> F and 12 </ b> B have a waistline portion that is a front-rear direction range corresponding to the waistline region T. In this embodiment, the front exterior body 12F does not have a portion corresponding to the intermediate region L, but the rear exterior body 12B has a collar cover portion 14 that extends from the waist region T to the intermediate region L side. is doing. Although not shown, the front exterior body 12F is also provided with a collar cover portion that extends from the waistline region T toward the intermediate region L, a configuration that does not provide a collar cover portion while providing a groin cover portion, and the front exterior body 12F and It is not necessary to provide a portion corresponding to the intermediate region L in both of the rear exterior bodies 12B. Moreover, in the illustrated form, the lower edge of the buttock cover portion 14 is formed in a straight line shape along the width direction WD, similarly to the lower edge of the front exterior body 12F, but is positioned closer to the waist opening as it goes outward in the width direction. It can also be a curve that becomes.

  As shown in FIGS. 3 to 5, the exterior bodies 12 </ b> F and 12 </ b> B are formed by joining the outer sheet layer 12 </ b> S and the inner sheet layer 12 </ b> H by a joining means such as a hot melt adhesive or welding. The sheet material for forming the outer sheet layer 12S and the sheet material for forming the inner sheet layer 12H are a single sheet material as shown in FIG. 5 and are individually separated as shown in FIG. It can also be a sheet material. That is, in the former case, the inner sheet layer 12H and the outer sheet layer 12S are respectively formed by the inner part and the outer part of one sheet material folded at the edge of the waist opening WO (may be the crotch edge). Is done. In the former form, there is an advantage that the inner sheet layer 12H and the outer sheet layer 12S are not easily displaced, and the latter form has an advantage that the number of sheet materials is small.

The sheet material used for the outer sheet layer 12S and the inner sheet layer 12H can be used without any particular limitation, but is preferably a non-woven fabric. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, Nonwoven fabrics composed of mixed fibers, composite fibers or the like in which more than one species are used can be used. 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. When using a nonwoven fabric, the basis weight is preferably about 10 to 30 g / m ² .

Moreover, it is preferable that the total weight of the exterior bodies 12F and 12B is about 20 to 60 g / m ² .

(Extensible / non-extensible area)
And in the exterior bodies 12F and 12B, in order to improve the fit with respect to the wearer's waist, elongated elastic elastic members 15 to 19 such as thread rubber are provided between the outer sheet layer 12S and the inner sheet layer 12H. An expansion / contraction region is formed that elastically expands and contracts in the width direction WD along with expansion / contraction of the elastic expansion / contraction member. In this stretchable region, in the natural length state, the outer sheet layer 12S and the inner sheet layer 12H are shrunk with the shrinkage of the elastic stretchable member to form wrinkles or wrinkles, and when stretched in the longitudinal direction of the elastic stretchable member, The outer sheet layer 12 </ b> S and the inner sheet layer 12 </ b> H can be stretched to a predetermined stretch rate that can be fully stretched. As the elongated elastic elastic members 15 to 19, synthetic rubber or natural rubber may be used. For bonding the outer sheet layer 12S and the inner sheet layer 12H in the exterior bodies 12F and 12B and fixing the elongated elastic members 15 to 19 sandwiched between them, hot melt adhesives and heat seals by various coating methods are used. At least one of fixing means by material welding such as an ultrasonic seal can be used. Since the flexibility is lost when the entire exterior bodies 12F and 12B are firmly fixed, it is preferable that the portions other than the adhesive portions of the elongated elastic elastic members 15 to 19 are not adhered or weakly adhered. In the illustrated embodiment, a hot melt adhesive is applied only to the outer peripheral surfaces of the elongated elastic elastic members 15 to 19 by an application means such as a comb gun or a sure wrap nozzle, and sandwiched between both sheet layers 12S and 12H, thereby forming the elongated shape. With only the hot melt adhesive applied to the outer peripheral surfaces of the elastic elastic members 15 to 19, fixing the elongated elastic elastic members 15 to 19 to both the sheet layers 12S and 12H and fixing between the two sheet layers 12S and 12H It has a structure to do. The elastic elastic members 15 to 19 can be fixed to the outer sheet layer 12S and the inner sheet layer 12H only at both ends in the expansion / contraction direction in the expansion / contraction region.

More specifically, between the outer sheet layer 12S and the inner sheet layer 12H in the waist part W of the exterior bodies 12F and 12B, a plurality of waist elastic elastic members 17 are vertically spaced so as to be continuous over the entire width direction. It is installed with a gap. Moreover, about the 1 or several arrange | positioned by the area | region adjacent to the waist lower part U among the waist part elastic elastic members 17, you may overlap with the interior body 200 or the width direction which overlaps with the interior body 200 You may each provide in the width direction both sides except a center part. As the waist resilient and elastic members 17, the thickness 155～1880Dtex, particularly about 470～1240Dtex (the case of synthetic rubber. Cross-sectional area in the case of natural rubber 0.05 to 1.5 mm ^2, in particular 0.1 to 1 the rubber thread .0mm about ²⁾ is preferably provided about 3 to 22 present at intervals of 4 to 12 mm, this elongation in the width direction WD of the waist portion W by the 150% to 400%, particularly about 220 to 320% Is preferred. Further, the waist portion W does not need to have the same thickness waist elastic elastic member 17 in all of the front-rear direction LD or have the same elongation rate. For example, the elastic elastic member 17 at the upper portion and the lower portion of the waist portion W. You may make it differ in the thickness and elongation rate of.

  In addition, a plurality of waist lower elastic elastic members 15 and 19 made of an elongated elastic elastic member are vertically spaced between the outer sheet layer 12S and the inner sheet layer 12H in the waist lower part U of the exterior bodies 12F and 12B. It is installed with a gap.

The waist lower elastic elastic members 15 and 19 have a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1. the rubber thread ~1.0mm about ^2), 1 to 15 mm, particularly preferably to dispose 5-30 present at intervals of 3 to 8 mm, elongation in the width direction WD of the waist lower portion U by which from 200 to 350 %, Particularly about 240 to 300% is preferable.

  Further, a plurality of cover elastic elastic members 16 made of an elongated elastic elastic member are vertically spaced between the outer sheet layer 12S and the inner sheet layer 12H in the buttock cover part 14 of the rear exterior body 12B. It is attached.

The cover elastic elastic member 16 has a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to 1. the rubber thread 0mm about ^2), 5 to 40 mm, particularly preferably to dispose about 2 to 10 present at intervals of 5 to 20 mm, this elongation in the width direction WD of the cover portion by 150 to 300%, in particular 180 to It is preferably 260%.

  In the case where an inguinal cover is provided on the front exterior body 12F, a cover elastic member can be provided in the same manner.

  When the elastic elastic members 15, 16, and 19 are provided in the front-rear direction range having the absorbent body 56, such as the waist lower part U and the buttock cover part 14 in the illustrated form, the width of the absorbent body 56 in part or all thereof. In order to prevent the shrinkage in the direction WD, the intermediate in the width direction (preferably including the entire inner / outer fixing portion 201) including a part or all of the portion overlapping the absorbent body 56 and the width direction WD is defined as the non-stretchable region A1. The both sides in the width direction are taken as the stretchable area A2. Although it is preferable that the waist part W is made into the expansion-contraction area | region A2 over the whole width direction, you may provide a non-expansion-contraction area | region in the width direction middle like the waist lower part U.

  The stretchable region A2 and the non-stretchable region A1 supply elastic stretchable members 15-17, 19 between the inner sheet layer 12H and the outer sheet layer 12S, and the elastic stretchable members 15, 16, 19 are at least in the stretchable region A2. The elastic stretch members 15, 16, and 19 are fixed at both ends in the expansion / contraction direction via the hot melt adhesive, not fixed in the region that becomes the non-stretch region A 1, but in the region that becomes the non-stretch region A 1. Cut by pressurization and heating at one place, or cut almost the whole elastic elastic members 15, 16, 19 by pressurization and heating to leave the stretchable area A2 and stretch in the non-stretchable area A1 Can be built by killing sex.

(indicator)
Between the liquid-impermeable sheet 11 and the absorber 56, an indicator 80 is provided that changes color when it comes into contact with the liquid content of excrement. The indicator 80 is a colorant that exhibits a color reaction by contact with the liquid content of excrement and / or a colorant that exhibits a color reaction by detecting pH in water, or a liquid content of excrement. Ink or adhesive containing a drug that shows color change, reaction in which coloring disappears due to reaction, colorant dissolves (disperses) in urine (disperses), disappears, or disappears, or liquid of excrement It is comprised by the sheet-like member containing the chemical | medical agent (indicator reaction means) which shows a visual change by contact with minutes. For example, as a colorant that exhibits a color reaction upon contact with the liquid of excrement, a water-soluble, water-decomposable dye or leuco dye and a phenolic compound, an acidic substance, an electron accepting substance that develops color of the leuco dye It is possible to use a colorant comprising a developer such as

  The color that appears by coloration is not particularly limited, but it is difficult to see the same color (usually white) as the outer surface of the diaper, so that a color that is different from the outer surface of the diaper is suitable.

  The indicator 80 is visible between the outer surface of the diaper and the back surface of the absorber 56 and the liquid-impermeable sheet 11, specifically, the side surface of the absorber 56 of the liquid-impermeable sheet 11 or the inner surface of the packaging sheet 58. Alternatively, it is desirable to form the outer surface by applying ink or an adhesive constituting the indicator 80. The shape of each indicator is not particularly limited, and may be an appropriate shape such as a polygonal shape in addition to an elongated shape such as a linear shape or a strip shape as shown in FIGS. 2, 7, 9, and 11. can do. The width in the case of an elongated pattern is 2 to 5 mm when only one is provided, and when two or more are provided, the width per one is 1 to 2 mm, and about 2 to 4 are about 0.5 to 1.5 mm apart. Is preferably arranged. Of course, a sheet on which the indicator 80 is formed can be manufactured separately, and the sheet-like indicator 80 can be built in the diaper.

  When the indicator 80 is composed of ink, the component of the indicator 80 is obtained by adding a colorant to the ink. When the indicator 80 is composed of an adhesive, the water-soluble polymer or the hydrophilic polymer is made of resin or the like. A water-insoluble component and a colorant are added. Specific examples in the case of comprising an adhesive include a water-insoluble polymer composed of a polyethylene glycol molecular weight of 100 to 500, polyvinyl pyrrolidone, vinyl acetate copolymer, and water-soluble polyester, and a water-insoluble solution of a highly polar tackifying resin and a plasticizer. And a colorant that indicates the acidity / alkaline degree (pH) of the liquid in contact by color change.

  When the indicator 80 is constituted by an adhesive, various known adhesives can be used as the adhesive. As an example, the case where a hot melt adhesive is used will be described in detail. By using a hot melt adhesive containing a colorant as the indicator 80, the colorant can be prevented from diffusing and leaching, and the sheet-like shape can be prevented. Compared with the case where the indicator is provided, since it can be easily performed in-line, the indicator attaching work process can be greatly saved. Moreover, when the indicator 80 is comprised with the adhesive agent, the member (in the illustration form, the packaging sheet 58 and the liquid-impermeable sheet 11) can be adhered.

  On the other hand, when the indicator 80 made of a sheet-like member is used, the sheet-like member is placed between the liquid-impermeable sheet 11 and the absorbent body 56, specifically, between the absorbent body 56 and the inner surface of the packaging sheet 58. Alternatively, it is arranged between the back surface of the packaging sheet 58 and the liquid-impermeable sheet 11. When this sheet-like indicator 80 is used, the number of members is increased as compared with the case where the liquid indicator 80 is applied and provided, but it can be easily used in a necessary amount in a necessary portion. Thus, the cost can be reduced by reducing the use area of the sheet-like member including the indicator reaction means.

(Positional relationship between indicator and slit)
The indicator 80 entirely overlaps with the non-slit portion located on the side of the slit 54, and all (or a part thereof as shown in FIG. 11) is located at the end of the non-slit portion on the slit 54 side. Is done. The interval 80d in the width direction WD between the side edge of the slit 54 and the side edge of the indicator 80 adjacent thereto may be determined as appropriate, but is preferably 1 to 10 mm, and particularly preferably 1 to 5 mm. 80 or the entire length of the slit 54 in the front-rear direction LD may be constant or may vary. In addition, the indicator 80 may be positioned within the front-rear direction range of the slit 54 or may be provided at least one side before and after the front-rear direction range of the slit 54.

  As shown in FIGS. 2 and 7, in the form having the slit 54 at the center of the width direction WD in the absorber 56, it is desirable to provide the indicators 80 on both sides of the width direction WD of the slit 54, respectively. In the form having the slits 54 on both sides of the width direction WD in the absorber 56 as in the form shown in FIG. 11, it is desirable to provide the indicator 80 between these slits 54.

  Thus, when the slit 54 and the indicator 80 are arranged very close to each other, even if a small amount of urine is passed, it passes through the slit 54 and diffuses in the front-rear direction LD, and the back side of the non-slit portion near the side edge of the slit 54 Supplied up to. Therefore, if the indicator 80 extends in the front-rear direction LD along the side edge of the slit 54 so that the entire indicator 80 overlaps with the non-slit 54 portion positioned on the side of the slit 54, even if a small amount of urine is discharged. Urine is supplied to the indicator 80 and discoloration occurs. Therefore, for example, as shown in FIG. 9, even if the indicator 80 is provided in an intermittent pattern in the front-rear direction LD, urine is easily supplied to the indicator 80 during urination, so that more reliable discoloration is possible. In addition, when the indicator 80 is provided in an intermittent pattern in the front-rear direction LD, even if some of the indicators 80 start to absorb moisture and change color before use, moisture is not easily transmitted to other parts. It can be known that there was urination due to discoloration of the part.

  On the other hand, when the slit 54 and the indicator 80 are arranged very close to each other, the indicator 80 is likely to be discolored before use due to moisture absorption of the superabsorbent polymer particles in the vicinity of the slit 54 on the back surface of the absorber 56. Therefore, as described below, it is important to provide superabsorbent polymer particles at the bottom of the slit 54.

(Superabsorbent polymer particles at the bottom of the slit)
Characteristically, superabsorbent polymer particles 56p are scattered at the bottom of the slit 54 of the absorber 56 (a layer of superabsorbent polymer particles 56p may be provided). The amount of superabsorbent polymer particles 56p provided at the bottom of the slit 54 may be appropriately determined, but preferable to be 100 to 300 g / m ^2, and particularly preferably 150 to 250 g / m ^2.

  As described above, when the superabsorbent polymer particles 56p are scattered on the bottom of the slit 54 of the absorber 56 or the superabsorbent polymer particle 56p layer is provided, the moisture in the slit 54 becomes high at the bottom. Moisture is preferentially absorbed by the absorbent polymer particles 56p. As a result, the superabsorbent polymer particles 56p at the bottom of the slit 54 are sacrificed, and the supply of moisture to the superabsorbent polymer particles 56p and the indicator 80 located on the side of the slit 54 via the slit 54 is suppressed. The In addition, when the superabsorbent polymer particles 56p and the indicator 80 overlap, when the superabsorbent polymer particles 56p absorbs moisture and becomes a gel, the moisture is supplied to the indicator 80, and the indicator 80 is discolored. Although there is a possibility, in the present invention, since the indicator 80 is not disposed at a portion overlapping the slit 54, such discoloration is also prevented.

  Further, as shown in the illustrated embodiment, at the portion having the slit 54, the members adjacent to the front and both sides of the absorber 56 (in the illustrated embodiment, on the portion of the packaging sheet 58 positioned on the front side of the absorber 56 and the back side of the absorber 56). It is preferable that the positioned portions are not joined to each other because diffusion of urine is promoted by the slits 54 on the back side of the top sheet 30. However, if the inside of the slit 54 is a space, the slit 54 becomes a crack in the absorber 56 during the absorption expansion of the absorber 56, and the absorber 56 may collapse. Such collapse of the absorbent body is not preferable because it may cause leakage or deteriorate the feeling of wearing. On the other hand, as described above, when the superabsorbent polymer particles 56p are provided to some extent at the bottom of the slit 54, the superabsorbent polymer expands in the slit 54 after urination to prevent collapse from the slit 54 portion. Can do.

(Cover non-woven fabric)
The cover nonwoven fabric covers the back side of the liquid-impermeable sheet 11 and forms the outer surface of the product in at least a part of the portion covering the liquid-impermeable sheet 11. That is, the cover nonwoven fabric corresponds to the crotch portion cover sheet 12M and the portion that overlaps the liquid-impermeable sheet 11 in the exterior body 12 in the above-described exterior two-divided pants-type disposable diaper. In the integral type pants-type disposable diaper, the portion of the exterior body 12 that overlaps the liquid-impermeable sheet 11 corresponds to this.

  As the cover nonwoven fabric, a non-porous nonwoven fabric is widely used, but it is also known to use a perforated nonwoven fabric that has perforated holes to provide air permeability that is greater than the fiber gap. However, when a perforated nonwoven fabric having holes as a whole is used in a form having slits in the absorbent body, it is easy to feel dampness when touching the outer surface of the disposable diaper, which may cause discomfort. On the other hand, when a perforated nonwoven fabric is used in a form having an indicator, there is an advantage that the color change of the indicator can be visually recognized more clearly at the portion where the indicator and the hole overlap. Therefore, in order to make these compatible, as shown in FIG. 11, in the crotch portion cover sheet 12M that is a cover nonwoven fabric, the region including the portion overlapping the indicator 80 (in the illustrated form, the entire front-rear direction between the slits 54), It is preferable not to provide the hole 21 in a region (a whole front-and-rear direction on both sides in the width direction in the illustrated embodiment) including a portion where a large number of holes 21 penetrating the front and back are provided at intervals and overlap with the slit 54.

The type of fiber of the cover nonwoven fabric and the processing method of fiber bonding (entanglement) are not particularly limited, and the same material as the exterior sheet can be selected as appropriate, but it is desirable to use an air-through nonwoven fabric, and the basis weight in that case Is preferably 20 to 30 g / m ² and a thickness of 0.2 to 0.6 mm.

  The planar shape (opening shape) of each hole 21 can be determined as appropriate, and has a long hole shape as shown in FIGS. 16 (a) and 16 (b), as shown in FIGS. 16 (c) and 16 (e). It can be an arbitrary shape such as a perfect circle, an ellipse as shown in FIG. 16D, a polygon such as a triangle, a rectangle or a rhombus, a star or a cloud. Although the size of each hole 21 is not particularly limited, the maximum dimension 21L in the front-rear direction LD is preferably 0.3 to 1.8 mm, particularly 0.4 to 1.0 mm, and the maximum dimension 21W in the width direction WD is The thickness is preferably 0.2 to 1.5 mm, particularly preferably 0.3 to 1.0 mm. When the shape of the hole 21 is a shape that is long in one direction such as a long hole shape, an ellipse shape, a rectangle shape, a rhombus shape, etc., the maximum dimension in the longitudinal direction is 1.2 to 2.5, which is the maximum dimension in the direction orthogonal thereto. It is preferable that it is double. In addition, when the shape of the hole 21 is long in one direction, the longitudinal direction of the hole 21 is desirably the front-rear direction LD, but may be the width direction WD or an oblique direction.

Although individual area and the area ratio of the holes 21 may be appropriately determined, it is preferable that the area is 0.1~2.7mm ² (especially 0.1 to 1.0 mm ²⁾ about, the area ratio 0. It is preferably about 5 to 13.0% (particularly 5.0 to 10.0%).

  Although the plane arrangement of the holes 21 can be determined as appropriate, a plane arrangement that is regularly repeated is preferable, and is an orthorhombic lattice shape as shown in FIG. 16A or a hexagonal lattice shape as shown in FIG. (These are also referred to as a staggered pattern.), A square grid pattern as shown in FIG. 16 (c), a rectangular grid pattern as shown in FIG. 16 (d), and a parallel grid as shown in FIG. Thus, a configuration in which two groups are arranged so that a large number of parallel diagonal rows intersect each other) (including those inclined at an angle of less than 90 degrees with respect to the front-rear direction LD) In addition to what is regularly repeated, the group of holes 21 (the group unit arrangement may be regular or irregular, and may be a pattern or a letter shape) may be regularly repeated.

  The front-rear direction interval 21y and the width direction interval 21x of the holes 21 can be determined as appropriate. However, in consideration of air permeability, 21y is 0.9 to 8.0 mm, 21x is 2.0 to 10 mm, and particularly 21y is 1. It is desirable that 0 to 3.0 mm and 21x are within a range of 3.0 to 5.0 mm. In particular, as shown in FIG. 16 (d), a row of holes 21 arranged in the front-rear direction LD with a front-rear direction interval 21y narrower than the front-rear dimension 21L of the holes 21 repeats at a predetermined interval in the width direction WD, and the width thereof When the direction interval 21x is wider than the dimension 21L in the front-rear direction of the hole 21 (and preferably more than three times the dimension 21W in the width direction of the hole 21), the air permeability is significantly improved, and the softness and bulkiness are increased. This is preferable because the tensile strength of the sheet in the front-rear direction LD, which is important at the time of manufacture, does not decrease. Particularly in this case, the shape of the hole 21 is preferably elongated in the front-rear direction LD.

  As the cross-sectional shape of the hole 21, as shown in FIG. 13, the thickness of the nonwoven fabric becomes thinner from the periphery of the hole 21 toward the edge of the hole 21, and the edge of the hole 21 is located in the middle of the thickness direction of the nonwoven fabric. As shown in FIG. 21, the edge 21e of the hole 21 is warped to the front side as shown in FIG. 21 and the height 21h of the warp is almost uniform, and the edge of the hole 21 as shown in FIG. 21e is warped to the front side, the edge 21e is a facing portion having the highest warped height 21i, and a facing portion facing in the direction orthogonal to the facing portion and having the lowest warped height 21j. A third form having: The code | symbol 20 in FIGS. 13-15 has shown the cover nonwoven fabric.

  From the viewpoint of air permeability, the second form and the third form in which the portion having the hole 21 is thicker than the surroundings are desirable. In the first form and the second form, the hole 21 of the cover nonwoven fabric 20 is a liquid-impermeable sheet. The third form is particularly desirable because it is easily clogged with the surface of 11, and the air enters and exits less. On the other hand, in the third embodiment, a gap is easily formed between the edge of the hole 21 and the liquid-impermeable sheet 11 due to the difference between the warped heights 21i and 21j of the edge 21e of the hole 21. , Air is easy to go in and out. That is, the air permeability is significantly improved. Moreover, while the hole 21 is formed, the flexibility is improved and the bulkiness is also improved by the warped portion. It is preferable that the warped heights 21h, 21i, and 21j (apparent height when no pressure is measured using an optical microscope) is about 0.2 to 1.2 mm. In the third embodiment, The highest warped height 21i is preferably about 1.1 to 1.4 times the lowest warped height 21j.

  Even if the hole 21 is a punched hole 21 whose edge is formed by the cut end of the fiber, the edge of the hole 21 has almost no cut end of the fiber, and a pin is inserted between the fibers and pushed wide. The formed non-punched hole 21 (the fiber density of the edge part is high) may be sufficient. The former is suitable for the first embodiment, and the latter is suitable for the second and third embodiments. For example, when a hole 21 having a shape that is long in one direction is formed by inserting a pin, the fibers of the edge 21e of the hole 21 are retracted outwardly or vertically, and the edge 21e of the hole 21 is warped and the length of the hole 21 is increased. The warped height i of the facing portion in the direction becomes higher than the warped height j of the facing portion in the direction orthogonal to the longitudinal direction. In the second form and the third form, the edge of the part where the edge 21e of the hole 21 warps to the surface may have a fiber density lower than that of the surrounding part. Preferably it is. Moreover, although it is desirable that the fibers at the edge of the hole 21 are fused, the fibers may not be fused.

<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%.

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

  ・ "Weight" is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 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, 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. .

  ・ If there is no description about the environmental conditions in the test and measurement, the test and measurement shall be performed in a test room or equipment in the standard condition (test location is temperature 20 ± 5 ℃, relative humidity 65% or less). .

  Although the said example is an application example with respect to an underpants type disposable diaper, this invention is applicable to disposable diapers in general, such as a tape type disposable diaper and a pad type disposable diaper.

  DESCRIPTION OF SYMBOLS 11 ... Liquid impermeable sheet | seat, 12 ... Exterior body, 12A ... Side seal part, 12B ... Rear side exterior body, 12F ... Front side exterior body, 12H ... Inner sheet layer, 12S ... Outer sheet layer, 12r ... West side folding | turning part , 14 ... buttocks cover part, 200 ... interior body, 201 ... inner and outer fixing part, 21 ... hole, 30 ... top sheet, 40 ... intermediate sheet, 50 ... absorbent element, 54 ... slit, 56 ... absorber, 56p ... high absorption Conductive polymer particles, 58 ... packaging sheet, 60 ... solid gather, 62 ... gather sheet, 80 ... indicator, A1 ... non-stretchable region, A2 ... stretchable region, L ... intermediate region, LD ... front-rear direction, LO ... leg opening, T ... waist circumference region, U ... waist lower part, W ... waist part, WD ... width direction, WO ... waist opening.