JP6767222B2 - Disposable diapers - Google Patents

Description

The present invention relates to a disposable diaper provided with an indicator that makes it possible to visually recognize the presence or absence of excretion of urine or the like from the outside by coloring.

Most 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). By visually recognizing the coloration (color development or discoloration) or decolorization of the indicator from the outside while wearing a disposable diaper, the user can recognize that there was excretion and can use it as a guideline for changing diapers. There is an advantage.

Since such an indicator is hidden behind the absorber and may not be discolored by a small amount of urination, a slit is formed in the portion of the absorber that overlaps with the indicator so as to penetrate in the thickness direction. , 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 also a problem that the indicator easily comes into contact with moisture in the air, and the color is thinly or sparsely discolored as a whole even before urination. Therefore, as a solution to this problem, it has been proposed that the position of the indicator does not overlap with the slit, but 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 prior examples, it is preferable that the indicator is as close as possible to the side edge of the slit from the viewpoint of easiness of discoloration of the indicator during urination (the discoloration can be effectively performed even with a small amount of urination).

However, the closer it is to the slit, the easier it is for water to be supplied to the indicator. In particular, since the highly absorbent polymer contained in the absorber has high hygroscopicity, the highly absorbent polymer near the slit on the back surface of the absorber absorbs moisture and gels due to storage under high humidity or long-term storage. Moisture contained in the gelled, highly absorbent polymer could come into contact with the indicator, causing the indicator to discolor before use.

Japanese Unexamined Patent Publication No. 2012-223230 JP 2015-195828 Japanese Unexamined Patent Publication No. 2010-0754464 Japanese Unexamined Patent Publication No. 2012-223231

Therefore, a main object of the present invention is to provide a disposable diaper provided with an indicator that is excellent in discoloration during urination but is not easily discolored before use due to moisture absorption of a highly absorbent polymer.

A typical aspect of the present invention that solves the above problems is as follows.
<First aspect>
Absorbents provided in the anterior-posterior range including the crotch area,
A liquid-permeable top sheet that covers the front side of the absorber,
A liquid-impermeable sheet that covers the back side of the absorber,
A slit extending in the front-rear direction provided in the absorber and
An indicator provided between the absorber and the liquid impermeable sheet that discolors due to contact with the liquid content of excrement,
With
The absorber contains fiber aggregates and highly absorbent polymer particles, and at least contains the highly absorbent polymer particles at the bottom.
In disposable diapers
The indicator is entirely overlapped with a non-slit portion located on the side of the slit, and a part or all of the indicator is located at an end portion of the non-slit portion on the slit side.
Highly absorbent polymer particles are scattered or provided with a highly absorbent polymer particle layer at the bottom of the slit of the absorber.
Disposable diapers that feature this.

(Action effect)
When a slit is formed in the absorber as described above, even a small amount of urine 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 a part or all of the indicator is located at the end of the non-slit portion on the slit side, a small amount of urine is required. Even if there is, urine will be supplied to the indicator and discoloration will occur.

Further, as described above, when the highly absorbent polymer particles are scattered at the bottom of the slit of the absorber or the highly absorbent polymer particle layer is provided, the moisture in the slit is highly absorbent at the bottom. Moisture is preferentially absorbed by the polymer particles. As a result, the supply of moisture through the slit to the highly absorbent polymer particles and indicators located on the side of the slit is suppressed at the expense of the highly absorbent polymer particles at the bottom of the slit. Further, if the highly absorbent polymer particles and the indicator overlap, when the highly absorbent 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 arranged at the portion overlapping the slit, such discoloration is also prevented.

<Second aspect>
The distance between the side edge of the slit and the side edge of the indicator adjacent thereto in the width direction is 1 to 5 mm.
The disposable diaper of the first aspect.

(Action effect)
When the slit and the indicator are arranged very close to each other in this way, the discoloration easily at the time of urination is particularly excellent, but on the other hand, the moisture absorption of the highly absorbent polymer makes the discoloration easy before use. Therefore, the present invention is particularly significant when applied to such a form.

<Third aspect>
At the portion having the slit, the members adjacent to both the front and back sides of the absorber are not joined to each other.
The basis weight of the highly absorbent polymer particles located in the slit is 100 to 300 g / m ² .
The disposable diaper of the first or second aspect.

(Action effect)
It is preferable that the members adjacent to both the front and back sides of the absorber are not joined at the portion having the slit because the slit promotes the diffusion of urine on the back side of the top sheet. However, if the inside of the slit is a space, the slit may become a crack in the absorber when the absorber absorbs and expands, and the absorber may collapse. Such collapse of the absorber may cause leakage or deteriorate the wearing feeling, and is not preferable. On the other hand, as described above, when the highly absorbent polymer particles are provided at the bottom of the slit to some extent, the highly absorbent polymer expands in the slit after urination and can be prevented from collapsing from the slit portion.

<Fourth aspect>
A 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.

(Action effect)
If the indicators are provided in an intermittent pattern in the front-back direction, even if some indicators absorb moisture before use and begin to discolor, it is difficult for water to be transmitted to other parts, so urination occurs due to discoloration of the remaining parts. You can know that there was. Further, in the present invention, since urine is easily diffused in the anteroposterior direction by the slit, even if the indicator is provided in an intermittent pattern in the anteroposterior direction, urine is easily supplied to the indicator when urinating, which is more reliable. Discoloration is possible.

<Fifth aspect>
It has a cover non-woven fabric that covers the back side of the liquid permeable sheet and forms the outer surface of the product at least a part of the portion that covers the liquid permeable sheet.
A large number of holes penetrating the front and back are provided at intervals in the area including the portion of the cover non-woven fabric that overlaps with the indicator.
The hole is not provided in the region of the cover nonwoven fabric including the portion overlapping the slit.
A disposable diaper according to any one of the first to fourth aspects.

(Action effect)
In disposable diapers, a cover non-woven fabric made of non-woven fabric is provided on the outside of a liquid-impermeable sheet in order to give the outer surface a cloth-like feel and appearance. As the cover non-woven fabric, a non-woven fabric having no holes is widely used, but it is also known to use a perforated non-woven fabric in which holes are perforated to provide air permeability equal to or higher than that of fiber gaps. However, if a perforated non-woven fabric is used in a form having slits in the absorber, it is easy to feel dampness when touching the outer surface of the disposable diaper, which may cause discomfort. On the other hand, when the perforated non-woven fabric is used in the form having the indicator, there is an advantage that the discoloration of the indicator can be more clearly visually recognized at the portion where the indicator and the hole overlap. Therefore, in order to achieve both of these, in the region including the portion overlapping with the indicator, as in the case of the above-mentioned cover non-woven fabric, a large number of holes penetrating the front and back are provided at intervals, and the region including the portion overlapping with the slit is provided. It is preferable not to provide a hole.

<Sixth aspect>
The non-slit portion of the absorber is a mixed product of pulp fibers and highly absorbent polymer particles, and contains highly absorbent polymer particles of 50% or more by weight with respect to the pulp fibers.
A disposable diaper according to any one of the first to fifth aspects.

(Action effect)
When the ratio of the highly absorbent polymer particles in the non-slit portion of the absorber is high as described above, the highly absorbent polymer in the vicinity of the slit on the back surface of the absorber is likely to absorb moisture, and the indicator is more likely to be discolored before use. Therefore, the present invention is particularly significant when applied to such a form.

<Invention according to claim 7>
The absorber is wrapped in a packaging sheet,
The indicator is a hot melt adhesive containing a discoloring substance that discolors upon contact with liquid in 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.

(Action effect)
Although the structure of such a disposable diaper is widely adopted, the present invention is particularly significant in such a disposable diaper.

As described above, according to the present invention, while being excellent in discoloration during urination, there are advantages such as being less likely to discolor before use due to moisture absorption of the highly absorbent polymer.

It is a developed state plan view which shows the inner surface of a pants type disposable diaper. It is a developed state plan view which shows the outer surface of a pants type disposable diaper. It is 3-3 sectional view of FIG. It is a cross-sectional view of 4-4 of FIG. (A) is a 5-5 cross-sectional view of FIG. 1 and (b) is a 6-6 cross-sectional view of FIG. It is a perspective view of a pants type disposable diaper. It is a developed state plan view which shows the outer surface of a pants type disposable diaper. (A) is a 5-5 sectional view of FIG. 7, and (b) is a 6-6 sectional view of FIG. It is a developed state plan view which shows the outer surface of a pants type disposable diaper. It is a cross-sectional view of 3-3 of FIG. It is a developed state plan view which shows the outer surface of a pants type disposable diaper. It is a cross-sectional view of 3-3 of FIG. It is (a) perspective view, (b) plan view, and (c) 1-1 sectional view which shows the hole of the exterior sheet. It is (a) perspective view, (b) plan view, and (c) 1-1 sectional view which shows the hole of the exterior sheet. It is (a) perspective view, (b) plan view, and (c) 1-1 sectional view which shows the hole of the exterior sheet. It is an enlarged plan view of a main part 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 portion 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 thereof, and is a solid, bead, curtain, summit or spiral coating of hot melt adhesive, or pattern coating. The fixed portion of the elastic stretchable member is formed by (transfer of hot melt adhesive by the letterpress method) or the like, or by coating the elastic stretchable member on the outer peripheral surface of the elastic stretchable member such as a comb gun or a sure wrap coating in place of or together with this. It is a thing. Examples of the hot melt adhesive include EVA type, adhesive rubber type (elastomer type), olefin type, polyester / polyamide type and the like, but they can be used without particular limitation. As the joining means for joining the constituent members, a means by welding materials such as a heat seal and an ultrasonic seal can also be used.

The pants-type disposable diaper 100 of this embodiment extends from the front exterior body 12F constituting the front body F, the rear exterior body 12B constituting the rear body B, and the rear exterior body 12B from the front exterior body 12F through the crotch portion. It is provided with an interior body 200 provided inside the exterior bodies 12F and 12B so as to exist, and both side portions of the front exterior body 12F and both side portions of the rear exterior body 12B are joined to form a side seal portion 12A. By being formed, the openings formed by the front and rear ends of the exterior bodies 12F and 12B become waist openings WO through which the wearer's body passes, and the lower edges of the exterior bodies 12F and 12B on both sides of the widthwise WD of the interior body 200. The portion surrounded by the side edges of the interior body 200 is the leg opening LO through which the legs pass. The interior body 200 is a part that absorbs and holds excrement such as urine, and the exterior bodies 12F and 12B are parts for supporting the interior body 200 with respect to the wearer's body. Further, the reference numeral Y indicates the total length of the diaper in the unfolded 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 reference numeral X indicates the diaper in the unfolded state. Shows the full width of.

Further, the pants-type disposable diaper 100 of the present embodiment forms a waist circumference region T defined as a front-rear direction range (a front-rear direction range 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. It has an intermediate region L defined as a front-rear direction range (between a front-rear direction region having a side seal portion 12A of the front body F and a front-rear direction region having a side seal portion 12A of the rear body B). The waist circumference region T can be divided into a "waist portion" W that conceptually forms an edge portion of the waist opening and a "waist lower portion" U that is a portion below this. Normally, when there is a boundary in the waist circumference region T where the stretching stress of the LD in the width direction changes (for example, the thickness and stretching rate of the elastic stretching member change), the waist opening WO side is closer to the waist opening WO side boundary than the boundary on the waist opening WO side. The waist portion W is formed, and if there is no such boundary, the waist portion W is on the waist opening WO side of the absorber 56 or the interior body 200. The length of these anteroposterior LDs varies depending on the size of the product and can be appropriately determined. 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 constricted in a U-shape or a curved shape along the circumference of the wearer's legs, and this is a portion for inserting the wearer's legs. As a result, the unfolded pants-type disposable diaper has an 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 absorbing element 50 interposed between them. Yes, it is the main body that has an absorption function. Reference numeral 40 indicates an intermediate sheet (second sheet) provided between the top sheet 30 and the absorption element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorption element 50. Shows three-dimensional gathers 60 standing on the body side provided on both sides of the interior body 200 in order to prevent excrement from leaking to both sides of the WD in the width direction of the interior body 200.

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

(Top sheet)
The top sheet 30 has a property of allowing liquid to permeate, and examples thereof include a perforated or non-perforated non-woven fabric and a porous plastic sheet. In addition, the non-woven fabric is not particularly limited as to what the raw material fiber is. For example, olefin-based fibers such as polyethylene and polypropylene, synthetic fibers such as polyester-based and polyamide-based fibers, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers in which two or more of these are used. Etc. can be exemplified. Further, the non-woven fabric may be produced 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, and if bulkiness and softness are required, the air through method, point bond method, and thermal bond method are preferable processing methods. ..

Further, the top sheet 30 may be one made of one sheet or one made of a laminated sheet obtained by laminating two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the plane direction.

When the three-dimensional gathers 60 are provided, both side portions of the top sheet 30 pass between the liquid-impermeable sheet 11 and the three-dimensional gathers 60 and wrap around to the back side of the absorbing element 50 to prevent the liquid from penetrating. It is preferable to join the transparent sheet 11 and the three-dimensional gather 60.

It is desirable that the top sheet 30 is fixed to a member adjacent to the back side by a joining means by material welding such as a heat seal or an ultrasonic seal or a hot melt adhesive for the purpose of preventing misalignment with respect to the back side member. .. In the illustrated form, the top sheet 30 is fixed to the surface of the intermediate sheet 40 and the surface of the portion of the packaging sheet 58 located on the front side of the absorber 56 by a hot melt adhesive applied to the back surface thereof.

(Intermediate sheet)
In order to quickly transfer the liquid that has permeated the top sheet 30 to the absorber, an intermediate sheet (also referred to as a "second sheet") 40 having a faster liquid permeation speed than the top sheet 30 can be provided. The intermediate sheet 40 not only rapidly transfers the liquid to the absorber to improve the absorption performance by the absorber, but also prevents the phenomenon of "return" of the absorbed liquid from the absorber, and constantly dries the top sheet 30. Can be in the state of The intermediate sheet 40 may be omitted.

Examples of the intermediate sheet 40 include the same materials as the top sheet 30, spunlace, spunbond, SMS, pulp non-woven fabric, mixed sheet of pulp and rayon, point bond or crepe paper. In particular, the air-through non-woven fabric is preferable because it is bulky. It is preferable to use a composite fiber having a core-sheath structure for the air-through non-woven 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 material fiber of the non-woven fabric is preferably 1.5 to 10 dtex. In order to make the non-woven fabric bulky, it is also preferable to use eccentric fibers having no core in the center, hollow fibers, and eccentric and hollow fibers as mixed fibers of all or a part of the raw material fibers.

The intermediate sheet 40 of the illustrated form is arranged 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 absorber 56, or may be within a short length range centered on the region for receiving the liquid.

It is desirable that the intermediate sheet 40 is fixed to a member adjacent to the back side by a joining means by material welding such as a heat seal or an ultrasonic seal or a hot melt adhesive for the purpose of preventing misalignment with respect to the back side member. .. In the illustrated form, the intermediate sheet 40 is fixed to the surface of the portion of the packaging sheet 58 located on the front side of the absorber 56 by a hot melt adhesive applied to the back surface thereof.

(Liquid impermeable sheet)
The material of the liquid-impermeable sheet 11 is not particularly limited, but for example, a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated non-woven fabric in which a plastic film is provided on the surface of the non-woven fabric, or a plastic film. An example is a laminated sheet in which a non-woven fabric or the like is laminated and bonded to the surface. For the liquid impermeable sheet 11, it is preferable to use a material having impermeable and moisture permeable properties, which is preferably used from the viewpoint of preventing stuffiness. As a moisture-permeable plastic film, 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 to this, non-woven fabrics using microdenyl fibers, leakage-proof strengthening by reducing the voids of the fibers by applying heat or pressure, coating of superabsorbent polymer or hydrophobic resin or water repellent, etc. Therefore, a liquid-impermeable sheet without using a plastic film can also be used as the liquid-impermeable sheet 11.

As shown in the figure, the liquid-impermeable sheet 11 has a width that fits on the back side of the absorbing element 50, and in order to improve leakage resistance, both sides of the absorbing element 50 are wrapped around the side surface of the top sheet 30 of the absorbing element 50. It can also be extended to both sides. The width of the extending portion is appropriately about 5 to 20 mm on each side.

Further, an indicator that changes color due to absorption of liquid can be provided inside the liquid impermeable sheet 11, particularly on the side surface of the absorber 56.

(Three-dimensional gather)
The three-dimensional gather 60 is a band-shaped member extending along the entire front-rear direction LD along both side portions of the interior body 200, and blocks excrement that travels laterally along the top sheet 30 to prevent lateral leakage. It is provided to do so. 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 portion on the base side stands up diagonally toward the center side in the width direction, and the portion on the tip side from the intermediate portion has a width. It stands diagonally toward the outside in the direction.

More specifically, in the three-dimensional gather 60, a strip-shaped gather sheet 62 having a length equal to the length in the front-rear direction of the interior body 200 is folded back in the width direction WD and folded in two, and the folded portion and a sheet in the vicinity thereof are folded back. In between, a plurality of elongated gather elastic elastic members 63 are fixed in an extended state along the longitudinal direction at intervals in the width direction WD. The base end portion (the end portion opposite to the seat folded portion in the width direction WD) located on the opposite side of the tip portion of the three-dimensional gather 60 is a mounting portion 65 fixed to the back surface of the side edge portion of the interior body 200. The portion other than the mounting portion 65 is a protruding portion 66 (a portion on the folded-back portion side) protruding from the mounting portion 65. Further, the protruding portion 66 is composed of a root side portion toward the center side in the width direction and a tip side portion folded outward in the width direction from the tip of the root side portion. This form is a surface contact type three-dimensional gather, but a line contact type three-dimensional gather (not shown) that does not fold outward in the width direction can also be adopted. Then, while both ends of the front-rear LD in the protruding portion 66 are fixed to the side surface of the top sheet 30 in an inverted state, the front-rear fixed portion 67 is located between them. 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, the inner layer and the outer layer of the gather sheet 62 are bonded together, and the gather elastic elastic member 63 sandwiched between them is fixed. At least one of fixing means by material welding such as an ultrasonic seal can be used. If the entire inner and outer layers of the gather sheet 62 are bonded together, the flexibility is impaired. Therefore, it is preferable that the parts other than the adhesive portion of the gather elastic elastic member 63 are not adhered or are weakly adhered. In the illustrated embodiment, the hot melt adhesive is applied only to the outer peripheral surface of the gather elastic expansion / contraction member 63 by an application means such as a comb gun or a sure wrap nozzle, and the hot melt adhesive is sandwiched between the inner layer and the outer layer of the gather sheet 62 to obtain the gather elastic expansion / contraction. 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.

Further, for fixing the waterproof film 64 incorporated in the three-dimensional gather 60 and the gather sheet 62 and fixing the front and rear fixing portions 67 to the side surface of the interior body 200, a hot melt adhesive and a heat seal by various coating methods are used. At least one of the means by welding the material such as or ultrasonic seal can be used. In the illustrated form, slot coating of a hot melt adhesive is used to fix the waterproof film 64. Further, although the means of hot melt adhesive and material welding are combined for fixing the front and rear fixing portions 67 in the illustrated form, these fixing can also be performed by only one of the means.

As the gather sheet 62, a flexible, uniform and concealing non-woven fabric such as spunbonded non-woven fabric (SS, SSS, etc.), SMS non-woven fabric (SMS, SMSMS, etc.), melt-blown non-woven fabric, etc., and water-repellent with silicone or the like as necessary. The treated material can be preferably used, and the fiber texture is preferably about 10 to 30 g / m ² . As the elongated elastic elastic member 63, thread rubber 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 fixing 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, the waterproof film 64 can be interposed between the gather sheets folded in two.

The number of elongated elastic elastic members 63 provided in the free portion of the three-dimensional gather 60 is preferably 2 to 6, and more preferably 3 to 5. The arrangement interval 60d is preferably 3 to 10 mm. With this configuration, it becomes easier for the elongated elastic elastic member 63 to hit the skin in the area where the elongated elastic elastic member 63 is arranged. The elongated elastic elastic member 63 may be arranged not only on the tip side but also on the base side.

The object of fixing the mounting portion 65 of the three-dimensional gather 60 can be an appropriate member such as the top sheet 30, the liquid-impermeable sheet 11, and the absorbing 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 to bring both ends of the front-rear LD toward each other, but the both ends of the front-rear LD among the protruding portions 66 are fixed so as not to stand up. On the other hand, since there is a non-fixed free part between them, only the free part stands up so as to abut on the body side as shown in FIG. In particular, when the mounting portion 65 is located on the back surface side of the interior body 200, the three-dimensional gathers 60 stand up so as to open outward in the width direction in the crotch portion and its vicinity, so that the three-dimensional gathers 60 hit the legs around the surface. It comes into contact and the fit is improved.

The dimensions of the three-dimensional gather 60 can be appropriately determined, but in the case of baby diapers, 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. Further, the separation distance W3 between the innermost folds when 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 70 to 140 mm.

In addition, unlike the illustrated form, three-dimensional gathers may be provided in double (two rows) on the left and right sides of the interior body 200.

(Absorption element)
The absorbing element 50 has an absorber 56 and a packaging sheet 58 that encloses the entire absorber 56. The packaging sheet 58 may be omitted.

(Absorber)
The absorber 56 contains highly absorbent polymer particles in the fiber assembly. As the fiber aggregate, in addition to those obtained by stacking short fibers such as cotton pulp and synthetic fibers, filament aggregates obtained by opening tow (fiber bundle) of synthetic fibers such as cellulose acetate as needed are also available. Can be used. The basis weight of fibers, when fiber stacking flocculent pulp or short fibers, for example, be a 100 to 300 g / m ² approximately, in the case of a filament aggregate, for example, be 30 to 120 g / m ² approximately Can be done. In the case of synthetic fibers, the fineness is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex. In the case of filament aggregates, the filaments may be non-crimped fibers, but are preferably crimped fibers. The degree of crimping of the crimped fibers can be, for example, 5 to 75 fibers per 2.54 cm , preferably 10 to 50 fibers, and more preferably about 15 to 50 fibers. In many cases, uniformly crimped crimped fibers are used. It is preferable to disperse and hold the highly absorbent polymer particles in the absorber 56.

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

Further, the size of the absorber 56 can be appropriately determined as long as it extends from the front, back, left and right of the urination port position, but it is preferable that the size of the absorber 56 extends to the peripheral portion of the interior body or its vicinity 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 absorber 56, a slit 54 having a predetermined width penetrating in the thickness direction extends in the front-rear direction LD in order to improve the liquid diffusivity of the front-rear direction LD. As long as the slit 54 is provided in the crotch portion, the length of the anteroposterior LD is not particularly limited, and therefore the slit 54 can be provided over the entire anteroposterior LD of the absorber 56. It is desirable to extend from the front side to the back 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 the 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 facing side walls are separated, but in a normal case, it is desirable that the width 54W is about 3 to 15% of the minimum width 56M of 53 minutes of the constricted portion 53 of the absorber 56. In the case of infant products, the thickness can be about 7 to 13 mm.

The number of slits 54 is not particularly limited, and one is provided at the center of the WD in the width direction as shown in FIGS. 2 and 7, and instead, both left and right sides are provided as in the forms shown in FIGS. 9 to 12. It is also possible to provide one for each. When a plurality of slits 54 are provided at intervals in the width direction WD, the width direction positions of the slits 54 are preferably symmetrical, and the width direction spacing 54d of the slits 54 is the minimum width of the constricted portion 53 of the absorber 56. It can be about 10 to 60% of 56M.

In addition to the form in which the slits 54 extend linearly along the front-rear direction LD as shown in the illustrated form, in particular, when a plurality of slits 54 are provided at intervals in the width direction WD, at least in the front-rear direction as in the form shown in FIG. It can also be bent so that the distance between the slits 54 increases toward one side. Further, 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 both front and rear ends of the slit 54 reach the side edges of the absorber 56, the portion lateral to the slit 54 is separate from the portion between the slits 54.

(Highly absorbent polymer particles)
The non-slit portion of the absorber 56 contains a mixture of highly absorbent polymer particles at least at the bottom, preferably throughout. The highly absorbent polymer particles include "powder" in addition to "particles". As the highly absorbent polymer particles, those used for this kind of absorbent article can be used as they are. For example, they are sieved by sieving (shaking for 5 minutes) using a standard sieve (JIS Z8801-1: 2006) of 500 μm. It is desirable that the proportion of particles remaining on the sieve is 30% by weight or less, and the proportion of particles remaining on the sieve is determined by sieving (shaking for 5 minutes) using a standard sieve (JIS Z8801-1: 2006) of 180 μm. 60% by weight or more is desirable.

The material of the superabsorbent polymer particles can be used without particular limitation, but those having a water absorption amount (JIS K7223-1996 "Water absorption test method for superabsorbent polymer") of 40 g / g or more are preferable. Highly absorbable polymer particles include starch-based, cellulose-based and synthetic polymer-based ones, such as starch-acrylic acid (salt) graft copolymer, saponified product of starch-acrylonitrile copolymer, and cross-linking of sodium carboxymethyl cellulose. A thing or a thing such as an acrylic acid (salt) polymer can be used. As the shape of the highly absorbent polymer particles, a commonly used powder or granular material is preferable, but other shapes can also be used.

As the highly absorbent 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 rate is too slow, so-called reversion, in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56, is likely to occur.

Further, as the highly absorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. As a result, even when the bulky absorber 56 is used, the sticky feeling after liquid absorption can be effectively suppressed.

The basis weight of the highly absorbent polymer particles can be appropriately determined according to the amount of absorption required for the application of the absorber 56. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . If the basis weight of the polymer is less than 50 g / m ² , it becomes difficult to secure the absorption amount. Above 350 g / m ² , the effect saturates.

The ratio of the fiber and the highly absorbent polymer particles in the absorber 56 is not particularly limited, but when the fiber: highly absorbent polymer particles have a weight ratio of 50:50 to 20:80, they are compared in the same area and the same amount of absorption. It can be a thinner absorber 56. 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 highly absorbent polymer particles can be changed in the thickness direction of the absorber 56. In particular, when the content (weight percentage) of the highly absorbent polymer particles in the absorber 56 increases stepwise or continuously from the back side to the front side, the liquid content of the excrement entering the absorber 56 side. It has excellent anti-reverse properties, which is known as a phenomenon in which particles return to the skin side. Of course, depending on the purpose, the content of the highly absorbent polymer particles in the absorber 56 may be increased stepwise or continuously from the front side to the back side, or stepwise or continuously from both the front and back sides toward the middle in the thickness direction. It can also be made higher. The stepwise change in the content of the highly absorbent polymer particles means that a plurality of layers having different contents are laminated and the content is almost constant in each layer, and the content changes continuously. Then, it means that there is no layer structure in which the content rate changes stepwise. Further, the content of the highly absorbent polymer particles in the absorber 56 is "gradually or continuously increasing" in the form in which the highly absorbent polymer particles are contained in the entire thickness direction of the absorber, as well as the absorber. It also includes a form in which a layer (layer having a content of 0) that does not contain highly absorbent polymer particles is provided on either the front or back side of the above, and the content is increased from the layer.

(Packaging sheet)
When the packaging sheet 58 is used, as the material thereof, tissue paper, particularly crepe paper, non-woven fabric, non-woven fabric of polylami, sheet with small holes, or the like can be used. However, it is desirable that the sheet does not allow the highly absorbent polymer particles to escape. When a non-woven fabric is used instead of the crepe paper, a hydrophilic SMS non-woven fabric (SMS, SMSMS, etc.) is particularly suitable, and polypropylene, polyethylene / polypropylene composite material, or the like can be used as the material. The basis weight is preferably 5 to 40 g / m ² , especially 10 to 30 g / m ² .

The packaging form of the packaging sheet 58 can be appropriately determined, but from the viewpoint of ease of manufacture and prevention of leakage of highly absorbent polymer particles from the front and rear edge edges, a cylinder is provided so as to surround the front and back surfaces and both side surfaces of the absorber 56. It is preferable that the components are wound in a shape, the front and rear edges thereof are projected from the front and rear of the absorber 56, and the overlapping portions and the overlapping portions 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 are composed of a front exterior body 12F which is a part constituting the front body F and a rear exterior body 12B which is a part constituting the rear body B, and the front exterior body 12F and the rear exterior body 12B. Is not continuous on the crotch side and is separated in the front-back direction LD. The separation distance 12d can be about 150 to 250 mm. A part of the exposed portion on the back surface of the interior body 200 in this separated portion (for example, the entire front-rear direction LD of the portion exposed between the front exterior body 12F and the rear exterior 12B, but up to the front-rear end of the interior body 200 It is desirable to attach the crotch cover sheet 12M made of non-woven fabric or the like so as not to extend and to cover both edges of the interior body 200 in the width direction) or the entire body, but it can be omitted. .. Further, as shown in FIGS. 7 and 8, the exterior body 12 may be integrated through the crotch from the front body F to the back body B. That is, the exterior bodies 12F and 12B that individually constitute the front body F and the back body B correspond to the former form, and the exterior body 12 that integrally constitutes the front body F and the back body B corresponds to the latter form. ..

The exterior bodies 12F and 12B have a waist circumference portion that is a range in the front-rear direction corresponding to the waist circumference region T. Further, in the present 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 buttock cover portion 14 extending from the waist circumference region T to the intermediate region L side. are doing. Although not shown, the front exterior body 12F may also be provided with an inguinal cover portion extending from the waist circumference region T to the intermediate region L side, or the front exterior body 12F and the front exterior body 12F may be provided with an inguinal cover portion but no groin cover portion. It is not necessary to provide a portion corresponding to the intermediate region L on both of the rear exterior body 12B. Further, in the illustrated embodiment, the lower edge of the buttock cover portion 14 is formed in a straight line along the WD in the width direction like the lower edge of the front exterior body 12F, but is located on the waist opening side toward the outside in the width direction. It can also be a curve that makes it possible.

As shown in FIGS. 3 to 5, the exterior bodies 12F and 12B are formed by joining the outer sheet layer 12S and the inner sheet layer 12H by a joining means such as a hot melt adhesive or welding. The sheet material forming the outer sheet layer 12S and the sheet material forming the inner sheet layer 12H are made into a common sheet material as shown in FIG. 5, and are individually formed as shown in FIG. It can also be used as a sheet material. That is, in the former case, the inner sheet layer 12H and the outer sheet layer 12S are formed by the inner portion and the outer portion of one sheet material folded back at the edge of the waist opening WO (which may be the edge on the crotch side), respectively. Will be done. The former form has an advantage that the inner sheet layer 12H and the outer sheet layer 12S are not easily displaced when they are bonded together, 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 particular limitation, but a non-woven fabric is preferable. For example, olefin-based fibers such as polyethylene and polypropylene, synthetic fibers such as polyester-based and polyamide-based, and two of these. A non-woven fabric made of mixed fibers, composite fibers, etc. in which seeds or more are used can be used. Further, the non-woven fabric may be produced 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 a non-woven fabric is used, the basis weight is preferably about 10 to 30 g / m ² .

Further, the total basis weight of the exterior bodies 12F and 12B is preferably about 20 to 60 g / m ² .

(Expandable area / non-expandable area)
The exterior bodies 12F and 12B are provided with elongated elastic elastic members 15 to 19 such as thread rubber between the outer sheet layer 12S and the inner sheet layer 12H in order to improve the fit to the waist circumference of the wearer. An elastic region is formed that elastically expands and contracts in the width direction WD with the expansion and contraction of the elastic elastic member. In this stretchable region, in the state of natural length, the outer sheet layer 12S and the inner sheet layer 12H contract with the contraction of the elastic stretchable member to form wrinkles or folds, and when stretched in the longitudinal direction of the elastic stretchable member, The outer sheet layer 12S and the inner sheet layer 12H can be stretched to a predetermined stretch rate without wrinkles. 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 on the exterior bodies 12F and 12B and fixing the elongated elastic elastic members 15 to 19 sandwiched between them, hot melt adhesives and heat seals are used by various coating methods. At least one of the fixing means by material welding such as an ultrasonic seal can be used. If the entire surfaces of the exterior bodies 12F and 12B are firmly fixed, the flexibility is impaired. Therefore, it is preferable that the parts other than the adhesive portion of the elongated elastic elastic members 15 to 19 are not adhered or are weakly adhered. In the illustrated form, a hot melt adhesive is applied only to the outer peripheral surfaces of the elongated elastic elastic members 15 to 19 by a coating means such as a comb gun or a sure wrap nozzle, and the hot melt adhesive is sandwiched between the two sheet layers 12S and 12H to form the elongated shape. With only the hot melt adhesive applied to the outer peripheral surfaces of the elastic elastic members 15 to 19, the elongated elastic elastic members 15 to 19 can be fixed to both sheet layers 12S and 12H, and the elongated elastic elastic members 15 to 19 can be fixed between both sheet layers 12S and 12H. It is 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 portion 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 space. Further, among the elastic elastic member 17 of the waist portion, one or a plurality of members arranged in the region adjacent to the lower waist portion U may overlap with the interior body 200, or may overlap with the interior body 200 in the width direction. It may be provided on both sides in the width direction except for the central portion. The waist elastic elastic member 17 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber, a cross-sectional area of 0.05 to 1.5 mm ^{2 in} the case of natural rubber, particularly 0.1 to 1). It is preferable to provide about 3 to 22 elastic strips (about 0.0 mm ² ) at intervals of 4 to 12 mm, and the elongation rate of the WD in the width direction of the waist portion W is about 150 to 400%, particularly about 220 to 320%. Is preferable. Further, the waist portion W does not need to use the elastic elastic elastic member 17 having the same thickness for all of the LDs in the front-rear direction or to have the same elongation ratio. For example, the elastic elastic member 17 at the upper part and the lower part of the waist portion W. The thickness and elongation rate may be different.

Further, between the outer sheet layer 12S and the inner sheet layer 12H in the waist lower portion U of the exterior bodies 12F and 12B, a plurality of waist lower elastic elastic members 15 and 19 made of elongated elastic elastic members are spaced in the vertical direction. It is installed with a space.

The elastic elastic members 15 and 19 at the lower part of the waist have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber, a cross-sectional area of 0.05 to 1.5 mm ^{2 in} the case of natural rubber, particularly 0.1. It is preferable to provide about 5 to 30 thread rubbers (about 1.0 mm ² ) at intervals of 1 to 15 mm, particularly 3 to 8 mm, and the elongation rate of the WD in the width direction of the lower waist portion U by this is 200 to 350. %, Especially preferably about 240 to 300%.

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

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

When the inguinal cover portion is provided on the front exterior body 12F, the cover portion elastic expansion / contraction 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 absorber 56 as in the lower waist portion U and the buttock cover portion 14 in the illustrated form, the width of the absorber 56 in a part or all of them. In order to prevent contraction of the directional WD, the middle width direction (preferably including the entire inner / outer fixing portion 201) including a part or all of the portion overlapping the absorber 56 and the WD in the width direction is designated as the non-stretchable region A1. Both sides in the width direction are defined as the expansion / contraction region A2. The waist portion W is preferably a stretchable region A2 over the entire width direction, but a non-stretchable region may be provided in the middle in the width direction as in the lower waist portion U.

The stretchable region A2 and the non-stretchable region A1 supply elastic stretchable members 15 to 17, 19 between the inner sheet layer 12H and the outer sheet layer 12S, and at least the elastic stretchable members 15, 16 and 19 in the stretchable region A2. The elastic stretchable members 15, 16 and 19 are intermediate in the width direction in the non-stretchable region A1 and not fixed in the non-stretchable region A1 by fixing with hot melt adhesive at both ends in the stretchable direction. It is cut at one place by pressurization and heating, or almost all of the elastic elastic members 15, 16 and 19 are finely cut by pressurization and heating, and the elastic region A2 is expanded and contracted while leaving elasticity. It can be constructed by killing the sex.

(indicator)
An indicator 80 that changes color when it comes into contact with the liquid content of excrement is provided between the liquid-impermeable sheet 11 and the absorber 56. The indicator 80 is a colorant that exhibits a color reaction upon contact with the liquid content of excrement and / or a colorant that detects pH in water and exhibits a color reaction, or a liquid content of excrement. A reaction in which the color disappears due to the reaction of the above, a reaction in which the colorant dissolves (disperses) in urine and bleeds or disappears, an ink or adhesive containing a drug showing other visual changes, or a liquid of excrement. It is composed of a sheet-like member containing a drug (indicator reaction means) that shows a visual change upon contact with a minute. For example, as a colorant that exhibits a color-developing reaction upon contact with the liquid content of excrement, a water-soluble, water-decomposable dye or a phenolic compound, an acidic substance, or an electron-accepting substance that causes the leuco dye to develop a color. It is possible to use a colorant composed of a color developer such as.

The color that appears depending on the coloration is not particularly limited, but if it is the same color as the outer surface of the diaper (usually white), it will be difficult to see, so it is preferable to use a color different from the outer surface of the diaper.

The indicator 80 is visible from the outer surface of the diaper between the back surface of the absorber 56 and the liquid permeable sheet 11, specifically, the side surface of the absorbent 56 of the liquid permeable sheet 11 or the inner surface of the packaging sheet 58. Alternatively, it is desirable to form the outer surface by applying an 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 slender shape such as a linear shape or a strip shape as shown in FIGS. 2, 7, 9 and 11, or a polygonal shape. can do. In the case of an elongated pattern, the width is 2 to 5 mm when only one is provided, and when multiple are provided, the width per one is 1 to 2 mm, and about 2 to 4 are spaced by about 0.5 to 1.5 mm. It is preferable to arrange at. Of course, a sheet on which the indicator 80 is formed can be manufactured separately, and the sheet-shaped indicator 80 can be incorporated in the diaper.

When the indicator 80 is composed of ink, the component of the indicator 80 is a colorant added to the ink, and when the indicator 80 is composed of an adhesive, the water-soluble polymer or the hydrophilic polymer is made of a resin or the like. A water-insoluble component and a colorant are added. Specific examples of the case where it is composed of an adhesive are a water-soluble polymer composed of polyethylene glycol molecular weight 100 to 500, polyvinylpyrrolidone, vinyl acetate copolymer, and water-soluble polyester, and a highly polar tackifying resin and a water-insoluble plasticizer. It is composed of a sex component and a colorant that indicates the degree of acidity (pH) of the liquid in contact by discoloration.

When the indicator 80 is composed of 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, diffusion and leaching of the colorant can be prevented, and a sheet-like shape can be prevented. Compared with the case where the indicator is provided, it can be easily carried out in-line, so that the work process for attaching the indicator can be significantly reduced. When the indicator 80 is made of an adhesive, the members on both the upper and lower sides (in the illustrated form, the packaging sheet 58 and the liquid impermeable sheet 11) can be adhered to each other.

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 absorber 56, specifically between the absorber 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-shaped indicator 80 is used, the number of members increases as compared with the case where the liquid indicator 80 is applied and provided, but it can be easily used in the required portion in the required amount. Therefore, the cost can be reduced by reducing the used area of the sheet-shaped member including the indicator reaction means.

(Positional relationship between indicator and slit)
The entire indicator 80 overlaps the non-slit portion located on the side of the slit 54, and the entire indicator 80 (or a part thereof as shown in FIG. 11) is located at the end of the non-slit portion on the slit 54 side. Will be done. The distance 80d in the width direction between the side edge of the slit 54 and the side edge of the indicator 80 adjacent thereto may be appropriately determined, but is preferably 1 to 10 mm, particularly 1 to 5 mm, and this distance is preferably the indicator. It may be constant or variable over the entire anteroposterior LD of the 80 or slit 54. Further, the indicator 80 may be located within the front-rear direction range of the slit 54, or may be provided at least one side of the front-back direction range of the slit 54.

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

When the slit 54 and the indicator 80 are arranged extremely close to each other in this way, even a small amount of urination 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. Will be supplied up to. Therefore, if the indicator 80 extends in the anteroposterior LD along the side edge of the slit 54 so that the entire indicator 80 overlaps the non-slit 54 portion located on the side of the slit 54, even a small amount of urine is urinated. Urine is supplied to the indicator 80, and discoloration occurs. Therefore, even if the indicator 80 is provided in the anteroposterior LD in an intermittent pattern as shown in FIG. 9, for example, urine is likely to be supplied to the indicator 80 at the time of urination, so that more reliable discoloration is possible. If the indicator 80 is provided in the front-rear LD in an intermittent pattern, even if some of the indicators 80 absorb moisture before use and start to discolor, it is difficult for water to be transmitted to other parts, so that the remaining indicators 80 are left. It can be known that there was urination due to the discoloration of the part.

On the other hand, when the slit 54 and the indicator 80 are arranged extremely close to each other, the indicator 80 tends to be discolored before use due to the moisture absorption of the highly absorbent 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 the highly absorbent polymer particles at the bottom of the slit 54.

(Highly absorbent polymer particles at the bottom of the slit)
Characteristically, the highly absorbent polymer particles 56p are scattered at the bottom of the slit 54 of the absorber 56 (a layer of the highly absorbent 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 highly absorbent polymer particles 56p are scattered on the bottom of the slit 54 of the absorber 56, or when the highly absorbent polymer particle 56p layer is provided, the moisture in the slit 54 is high at the bottom. Moisture is preferentially absorbed by the absorbent polymer particles 56p. As a result, the supply of moisture through the slit 54 to the highly absorbent polymer particles 56p and the indicator 80 located on the side of the slit 54 is suppressed at the expense of the highly absorbent polymer particles 56p at the bottom of the slit 54. Slit. Further, when the highly absorbent polymer particles 56p and the indicator 80 overlap each other, when the highly absorbent polymer particles 56p absorb moisture and become a gel, the moisture is supplied to the indicator 80 and the indicator 80 is discolored. Although there is a risk, in the present invention, since the indicator 80 is not arranged at a portion overlapping the slit 54, such discoloration is also prevented.

Further, as shown in the illustrated form, at the portion having the slit 54, the members adjacent to both sides of the front surface of the absorber 56 (in the illustrated form, the portion of the packaging sheet 58 located on the front side of the absorber 56 and the back side of the absorber 56). If the portions) are not joined to each other, the slit 54 on the back side of the top sheet 30 promotes the diffusion of urine, which is preferable. However, if the inside of the slit 54 is a space, the slit 54 becomes a crack in the absorber 56 when the absorber 56 absorbs and expands, and the absorber 56 may collapse. Such collapse of the absorber may cause leakage or deteriorate the wearing feeling, and is not preferable. On the other hand, as described above, when the highly absorbent polymer particles 56p are provided at the bottom of the slit 54 to some extent, the highly absorbent polymer expands in the slit 54 after urination to prevent the slit 54 from collapsing. Can be done.

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

As the cover non-woven fabric, a non-woven fabric having no holes is widely used, but it is also known to use a perforated non-woven fabric in which holes are perforated to provide air permeability equal to or higher than the fiber gap. However, when a perforated non-woven fabric having holes as a whole is used in a form having slits in the absorber, it is easy to feel dampness when touching the outer surface of the disposable diaper, which may cause discomfort. On the other hand, when the perforated non-woven fabric is used in the form having the indicator, there is an advantage that the discoloration of the indicator can be more clearly visually recognized at the portion where the indicator and the hole overlap. Therefore, in order to achieve both of these, as shown in FIG. 11, in the crotch cover sheet 12M which is a cover non-woven fabric, the region including the portion overlapping the indicator 80 (in the illustrated embodiment, the entire area between the slits 54 in the front-rear direction) is set. It is preferable that a large number of holes 21 penetrating the front and back surfaces are provided at intervals, and no holes 21 are provided in the region including the portion overlapping the slit 54 (in the illustrated embodiment, the entire front-rear direction on both sides in the width direction).

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

The planar shape (opening shape) of each hole 21 can be appropriately determined, and may be an elongated hole shape as shown in FIGS. 16 (a) and 16 (b), as shown in FIGS. 16 (c) and 16 (e). It can be a perfect circle, an ellipse as shown in FIG. 16D, a polygon such as a triangle, a rectangle, a rhombus, a star shape, a cloud shape, or any other shape. The dimensions of the individual holes 21 are not particularly limited, but the maximum dimension 21L of 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 of the width direction WD is It is preferably 0.2 to 1.5 mm, particularly 0.3 to 1.0 mm. When the shape of the hole 21 is long in one direction such as an elongated hole, an ellipse, a rectangle, a rhombus, etc., the maximum dimension in the longitudinal direction is 1.2 to 2.5 of the maximum dimension in the direction orthogonal to this. It is preferably doubled. Further, when the shape of the hole 21 is long in one direction, it is desirable that the longitudinal direction of the hole 21 is the front-rear direction LD, but the width direction WD or the oblique direction may be used.

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%).

The plane arrangement of the holes 21 can be appropriately determined, but a plane arrangement that is repeated regularly is preferable, and a diagonal grid shape as shown in FIG. 16A or a hexagonal grid shape as shown in FIG. 16B is preferable. (These are also called staggered), a square lattice as shown in FIG. 16 (c), a rectangular lattice as shown in FIG. 16 (d), and a parallel lattice as shown in FIG. 16 (e) (in the figure). (A form in which two groups of parallel diagonal rows are provided so as to intersect each other), etc. (including those tilted at an angle of less than 90 degrees with respect to the front-rear LD). In addition to the ones that are regularly repeated, the group of holes 21 (the arrangement of the group units may be regular or irregular, and may be a pattern, a character shape, etc.) may be regularly repeated.

The anteroposterior spacing 21y and the width spacing 21x of the holes 21 can be appropriately determined, but in consideration of air permeability, 21y is 0.9 to 8.0 mm, 21x is 2.0 to 10 mm, and 21y is 1. It is desirable that 0 to 3.0 mm and 21x are within the range of 3.0 to 5.0 mm. In particular, as shown in FIG. 16D, rows of holes 21 lined up in the front-rear direction LD with a front-rear direction interval 21y narrower than the front-rear direction dimension 21L of the holes 21 are repeated in the width direction WD at predetermined intervals, and the width thereof. When the direction spacing 21x is wider than the anteroposterior dimension 21L of the hole 21 (more preferably, it is more than three times the width direction dimension 21W of the hole 21), the improvement in air permeability is remarkable, and the softness and bulkiness are increased. It is also preferable because the tensile strength of the sheet in the front-rear direction LD, which is important during manufacturing, is not reduced. In particular, in this case, it is preferable that the shape of the hole 21 is elongated in the front-rear direction LD.

As for the cross-sectional shape of the hole 21, as shown in FIG. 13, the thickness of the non-woven fabric decreases as it approaches the edge of the hole 21 from the periphery of the hole 21, and the edge of the hole 21 is located in the middle of the thickness direction of the non-woven fabric. One form, the second form in which the edge portion 21e of the hole 21 is warped toward the front side as shown in FIG. 21 and the warped height 21h is substantially uniform, and the edge portion of the hole 21 as shown in FIG. 21e is warped up to the front side, and the edge portion 21e is the facing portion having the highest warped height 21i and the facing portion facing in the direction orthogonal to the facing portion having the lowest warping height 21j. A third form having the above is conceivable. Reference numerals 20 in FIGS. 13 to 15 indicate a cover non-woven fabric.

From the viewpoint of breathability, the second and third forms in which the portion having the holes 21 is thicker than the surroundings are desirable, and in the first and second forms, the holes 21 of the cover nonwoven fabric 20 are liquid-impermeable sheets. The third form is particularly desirable because it is easily blocked by the surface of 11 and the inflow and outflow of air is reduced. On the other hand, in the third form, a gap is likely to be formed between the edge portion of the hole 21 and the liquid impermeable sheet 11 due to the difference in the warp heights 21i and 21j of the edge portion 21e of the hole 21. , It becomes easier for air to come in and out. That is, the air permeability is significantly improved. Further, the flexibility is improved by forming the holes 21, and the bulkiness is also improved by the warped portion. The warp heights 21h, 21i, 21j (apparent height when no pressure is applied, which is measured using an optical microscope) are preferably about 0.2 to 1.2 mm, and in the third embodiment, The highest warp height 21i is preferably about 1.1 to 1.4 times the lowest warp height 21j.

Even if the hole 21 is a punched hole 21 whose edge is formed by a cut end of a fiber, there is almost no cut end of the fiber at the edge of the hole 21, and a pin is inserted between the fibers and expanded. It may be the formed non-punched hole 21 (high fiber density at the edge). The former is suitable for the first form, and the latter is suitable for the second and third forms. For example, when a hole 21 having a long shape in one direction is formed by inserting a pin, the fibers of the edge portion 21e of the hole 21 are rejected outward or in the vertical direction, the edge portion 21e of the hole 21 is warped, and the length of the hole 21 is long. The warp height i of the facing portion in the direction is higher than the warp height j of the facing portion in the direction orthogonal to the longitudinal direction. In the second and third forms, the fiber density of the edge portion of the portion where the edge portion 21e of the hole 21 is curved up to the surface may be lower than that of the surrounding portion, but is about the same or higher. It is preferable that it is. Further, it is desirable that the fibers at the edges of the holes 21 are fused to each other, but 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-back (vertical) direction" means the direction connecting the ventral side (front side) and the dorsal side (rear side), and the "width direction" means the direction orthogonal to the front-back direction (horizontal 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% To 49.0 g of the mixture, 1.0 g of the highly absorbent polymer is added, and the mixture is stirred with a stirrer. The produced gel is left in a constant temperature and humidity chamber at 40 ° C. × 60% RH for 3 hours, then returned to room temperature, and the gel strength is measured with a card meter (Curdmeter-MAX ME-500 manufactured by I. techno Engineering).

・ "Metsuke" is measured as follows. After pre-drying the sample or test piece, leave it in a test room or device in a standard state (the test place is a temperature of 20 ± 5 ° C. and a relative humidity of 65% or less) to bring it into a constant weight state. 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. It is not necessary to pre-dry the fibers having an official moisture content of 0.0%. A sample having a size of 200 mm × 250 mm (± 2 mm) is cut out from the test piece in a constant weight state using a paper density plate (200 mm × 250 mm, ± 2 mm). The weight of the sample is measured, the weight per square meter is calculated, and the basis weight is used.

-"Thickness" is automatically measured using an automatic thickness measuring device (KES-G5 handy compression measurement program) under the conditions of load: 0.098 N / cm ² and pressurized area: 2 cm ² .

-The water absorption amount is measured by JIS K7223-1996 "Water absorption test method for superabsorbent polymer".

-The water absorption rate shall be the "time to the end point" when JIS K7224-1996 "Water absorption rate test method for superabsorbent polymer" was performed using 2 g of super absorbent polymer and 50 g of physiological saline. ..

-If there is no description about the environmental conditions in the test or measurement, the test or measurement shall be performed in a test room or equipment under standard conditions (test location: temperature 20 ± 5 ° C, relative humidity 65% or less). ..

The above example is an application example to a pants type disposable diaper, but the present invention can be applied to all disposable diapers such as a tape type disposable diaper and a pad type disposable diaper.

11 ... Liquid permeable sheet, 12 ... Exterior body, 12A ... Side seal part, 12B ... Rear exterior body, 12F ... Front exterior body, 12H ... Inner sheet layer, 12S ... Outer sheet layer, 12r ... Waist side folded part , 14 ... buttock cover, 200 ... interior body, 201 ... inside / outside fixing part, 21 ... hole, 30 ... top sheet, 40 ... intermediate sheet, 50 ... absorption element, 54 ... slit, 56 ... absorber, 56p ... high absorption Sex polymer particles, 58 ... packaging sheet, 60 ... three-dimensional gather, 62 ... gather sheet, 80 ... indicator, A1 ... non-stretchable region, A2 ... stretchable region, L ... intermediate region, LD ... front-back direction, LO ... leg opening, T ... waist area, U ... lower waist, W ... waist, WD ... width direction, WO ... waist opening.

Claims (5)

Absorbents provided in the anterior-posterior range including the crotch area,
A liquid-permeable top sheet that covers the front side of the absorber,
A liquid-impermeable sheet that covers the back side of the absorber,
A slit extending in the front-rear direction provided in the absorber and
An indicator provided between the absorber and the liquid impermeable sheet that discolors due to contact with the liquid content of excrement,
With
The absorber contains fiber aggregates and highly absorbent polymer particles, and at least contains the highly absorbent polymer particles at the bottom.
In disposable diapers
The indicator is entirely overlapped with a non-slit portion located on the side of the slit, and a part or all of the indicator is located at an end portion of the non-slit portion on the slit side.
Wherein the bottom of the slit of the absorber, or the superabsorbent polymer particles are scattered, or has high-absorbent polymer particle layer is provided,
It has a cover non-woven fabric that covers the back side of the liquid permeable sheet and forms the outer surface of the product at least a part of the portion that covers the liquid permeable sheet.
A large number of holes penetrating the front and back are provided at intervals in the area including the portion of the cover non-woven fabric that overlaps with the indicator.
The hole is not provided in the region of the cover nonwoven fabric including the portion overlapping the slit.
Disposable diapers that feature this. The distance between the side edge of the slit and the side edge of the indicator adjacent thereto in the width direction is 1 to 5 mm.
The disposable diaper according to claim 1. At the portion having the slit, the members adjacent to both the front and back sides of the absorber are not joined to each other.
The basis weight of the highly absorbent polymer particles located in the slit is 100 to 300 g / m ² .
The disposable diaper according to claim 1 or 2. The disposable diaper according to any one of claims 1 to 3, wherein the indicator is formed in an intermittent pattern in the front-rear direction. The non-slit portion of the absorber is a mixed product of pulp fibers and highly absorbent polymer particles, and contains highly absorbent polymer particles of 50% or more by weight with respect to the pulp fibers.
The disposable diaper according to any one of claims 1 to 4 .

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