JP2013074981A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent interruption of display of an indicator.SOLUTION: In a disposable diaper, a clear and colorless indicator 80 is provided on a liquid-impermeable sheet 11 in such a manner as to come into contact with an excreted liquid coming from above. A part, which at least partially overlaps the indicator 80, of a packaging sheet 58 is coated with a developer 81 for making the indicator 80 develop a color. The whole part, which overlaps the indicator 80, of the packaging sheet 58 serves as a high-diffusion part 58h or 59 high in liquid diffusibility in a direction orthogonal to a thickness direction in comparison with surroundings. The developer 81 is dissolved in the excreted liquid and brought into contact with the indicator 80 together with the excreted liquid so that the indicator 80 can develop the color.

Description

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

  Many of disposable diapers for infants that are widely used at present 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.

  Of these conventional excretion indicators, the discoloration type indicator remains colored before and after excretion, so it is often difficult to notice excretion, and the decolorization type indicator remembers the presence of the indicator firmly after excretion. Because it is not, it is difficult to recognize that the indicator is gone and it is difficult to notice excretion.

  On the other hand, the color-developing indicator is the type most easily noticed because an indicator that was not visible before excretion emerges due to excretion. Also, if the indicator is an illustration or design such as a character or animal, it will attract children's interest by the appearance of the illustration or design, so it will be very useful for raising interest in urination in toilet training. Become.

  However, if the colored indicator is in the shape of an animal or character illustration, if the excretory fluid does not spread sufficiently, the entire image of the animal or character will not appear, for example, the face or torso will be cut off. This causes problems such as poor appearance or awakening of the child.

Japanese Utility Model Publication No. 60-75405 JP 2008-099947 A

  Therefore, the main problem of the present invention is to prevent the display of the indicator from being interrupted.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
In a disposable diaper comprising a liquid-permeable top sheet, a liquid-impermeable sheet, and an absorbent body interposed therebetween,
A lower sheet positioned on the back side of the absorber, and a liquid-permeable upper sheet positioned between the lower sheet and the absorber,
On the lower sheet, a colorless and transparent indicator is provided so as to come into contact with excretion fluid coming from above,
Applying a developer for coloring the indicator to a portion at least partially overlapping the indicator in the upper sheet,
The entire portion overlapping the indicator in the upper sheet is a high diffusion portion with high liquid diffusivity in the direction perpendicular to the thickness direction compared to the surroundings,
A disposable diaper characterized in that the developer dissolves in excretion fluid and contacts the indicator together with excretion fluid, and the indicator develops color.

(Function and effect)
In the present invention, the entire portion overlapping the indicator in the upper sheet is a highly diffusive portion having a high liquid diffusibility in the direction perpendicular to the thickness direction compared to the surrounding area, and thus the entire portion overlapping the indicator in the upper sheet containing the developer. The excretory liquid diffuses and the developer can be dissolved and supplied to the entire indicator. Therefore, the display of the indicator is difficult to be interrupted. For example, it is possible to suppress a situation in which the overall appearance of an indicator such as an animal or a character does not appear and a face or a torso is cut and the appearance deteriorates or a child awakens.

<Invention of Claim 2>
The disposable diaper according to claim 1, wherein the upper sheet is a nonwoven fabric, and the high diffusion portion is a high-density portion formed by compression in the thickness direction.

(Function and effect)
Such a high-density portion is preferable because the liquid suction force due to capillary action is relatively high, so that liquid is not only diffused in the high diffusion portion but also liquid is sucked from the surroundings. Further, this form has an advantage that a high diffusion portion can be formed without adding a material.

<Invention of Claim 3>
The high diffusion portion is formed by attaching a diffusion sheet having a high liquid diffusibility in a direction perpendicular to the thickness direction compared to the upper sheet to the entire portion overlapping the indicator on at least one of the upper and lower surfaces of the upper sheet. The disposable diaper according to claim 1.

(Function and effect)
This form is preferable in that it is not necessary to form the entire upper sheet with a nonwoven fabric.

<Invention of Claim 4>
The disposable diaper of any one of Claims 1-3 provided so that the said developer application part may overlap with the whole said indicator.

(Function and effect)
Thereby, the effect of the present invention is further improved.

  As described above, according to the present invention, there are advantages such as that the display of the indicator is hardly interrupted.

It is a top view in the state where the diaper was developed showing the inside of a pants type disposable diaper. It is a top view in the state where the diaper was developed showing 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. FIG. 5 is a sectional view taken along line 5-5 in FIG. 1. It is a top view in the state where the diaper was developed showing only the principal part of a pants type disposable diaper. It is sectional drawing which shows only the principal part of a pants type disposable diaper. It is a perspective view of a pants type disposable diaper. It is sectional drawing of the principal part containing an absorption element. It is sectional drawing of the principal part containing an absorption element. It is a top view which shows only the principal part. It is sectional drawing of the principal part containing an absorption element. It is a top view which shows only the principal part. It is sectional drawing of the principal part containing an absorption element.

Hereinafter, it explains in full detail about the embodiment of the present invention based on the example of application to a pants type disposable diaper.
1 to 8 show an example 100 of a pants-type disposable diaper. The pants-type disposable diaper 100 includes an exterior sheet 12 that forms the outer surface (rear surface) of the product and an interior body 200 that is attached to the inner surface of the exterior sheet 12. The interior body 200 is a part that absorbs and holds excrement such as urine, and the exterior sheet 12 is a part that is worn by the wearer. In addition, the dot pattern part in sectional drawing has shown the junction part which joins each structural member, and is formed by solid, beads, curtains, summits, spiral application, etc., such as a hot-melt-adhesive. The “front-rear direction” means the direction connecting the ventral side (front side) and the back side (rear side), “width direction” means the direction (left-right direction) orthogonal to the front-rear direction, and “up-down direction "In the state of wearing the diaper 100, that is, the direction perpendicular to the waistline direction when the diaper 100 is folded in two at the crotch portion so that both sides of the front body and the back body side of the diaper 100 are overlapped, in other words, For example, it means a direction connecting the waist opening WO side and the crotch side.

(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. Shows a three-dimensional gather 60 that stands on the body side and is provided on both sides of the interior body 200 in order to prevent excrement from leaking to both sides of the interior body 200.

(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.
When the three-dimensional gather 60 is provided, both sides of the top sheet 30 pass between the liquid impermeable sheet 11 and the three-dimensional gather 60 to the back side of the absorbent element 50 to prevent liquid penetration. It is preferable to adhere to the impermeable sheet 11 and the three-dimensional gather 60 with a hot melt adhesive or the like.

(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 ^{20~80g / m 2, 25~60g / m} 2 is more preferable. The thickness of the raw fiber of the nonwoven fabric is preferably 2.2 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.

(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 has been preferred in recent years from the viewpoint of preventing stuffiness. As a plastic sheet having moisture permeability, a porous plastic sheet 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 used. Widely used. In addition, non-woven fabric using micro-denier fibers, leakproof reinforcement by reducing the voids of the fibers by applying heat or pressure, and methods such as applying a 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 is preferably extended to both sides of the side surface of the top sheet 30 of the absorbent element 50 so as to improve leakage resistance. The width of this extended portion is suitably about 5 to 20 mm on each of the left and right sides.

(Three-dimensional gather)
The three-dimensional gather 60 is a belt-like member that extends over the entire front-rear direction along both side portions of the interior body 200, blocks urine and soft stool that move in the lateral direction along the top sheet 30, and prevents side leakage. It is provided for this purpose. 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 and folds it into two. In addition, a plurality of elongated elastic elastic members 63 are fixed along the longitudinal direction at intervals in the width direction. An end portion of the three-dimensional gather 60 opposite to the folded portion in the width direction is an attachment portion 65 fixed to the back surface of the side edge portion of the interior body 200, and portions other than the attachment portion 65 protrude from the attachment portion 65. It is set as the protrusion part 66 (part by the side of a folding | turning part). Further, both end portions in the front-rear direction of the protruding portion 66 extend from the mounting portion 65 to the side surface of the top sheet 30 through the side portion of the interior body 200 and are hot-melted with respect to the side surface of the top sheet 30. The base side portion is fixed to the front and rear fixing portion 67 by an adhesive or heat seal, and the tip side portion is folded back outward in the width direction from the tip of the base side portion and fixed to the base side portion. An intermediate part in the front-rear direction of the protruding part is an unfixed free part (inner free part), and an elongated elastic member 63 extending in the front-rear direction is fixed to the free part in an extended state.
The gather sheet 62 is made of a spunbond nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.), a melt-blown nonwoven fabric with excellent uniformity and concealment, and water repellent with silicon as 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%. Moreover, as shown in the drawing, a waterproof film 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 in the front-rear direction are brought close to each other, but the both ends in the front-rear direction of the protruding portion 66 are fixed so as not to stand up. On the other hand, since they are non-fixed free portions, only the free portions stand up against the body side 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. In the case of an infant paper diaper, for example, as shown in FIG. 7, 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 can be formed of an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used. The fiber basis weight can be set to, for example, about 100 to 300 g / m ² when cotton-like pulp or short fibers are stacked, and in the case of a filament aggregate, for example, about 30 to 120 g / m ^2. Can do. The fineness in the case of a synthetic fiber is 1-16 dtex, for example, Preferably it is 1-10 dtex, More preferably, it is 1-5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The crimped degree of the crimped fiber can be, for example, 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used. It is preferable to disperse and hold superabsorbent polymer particles in the absorber 56.
Although the absorbent body 56 may be rectangular, as shown in FIG. 6, as shown in FIG. 6, the hourglass has a front end portion, a rear end portion, and a narrow portion narrower than the front end portion and the rear end portion. When the shape is formed, it is preferable because the fit of the absorber 56 itself and the three-dimensional gather 60 around the legs is improved.
Moreover, although the dimension of an absorber can be determined suitably, it is preferable to extend to the peripheral part of the interior body, or its vicinity in the front-back direction and the width direction.

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or all thereof. Superabsorbent polymer particles include “powder” in addition to “particles”. As the particle diameter of the superabsorbent polymer particles, those used in this type of absorbent article can be used as they are, and those having a particle size of 1000 μm or less, particularly 150 to 400 μm are desirable. The material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. High-absorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and sodium carboxymethylcellulose crosslinks. Or an acrylic acid (salt) polymer can be used. As the shape of the superabsorbent polymer particles, a commonly used granular material is suitable, but other shapes can also be used.
As the superabsorbent polymer particles, those having a water absorption rate of 40 seconds or less are preferably used. When the water absorption speed exceeds 40 seconds, so-called reversion in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 is likely to occur.
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.
If necessary, the superabsorbent polymer particles can adjust the spraying density or spraying amount in the plane direction of the absorber 56. For example, it is possible to increase the application amount of the liquid excretion site as compared to other sites. When gender differences are taken into account, men can increase the front spray density (amount), while women can increase the center spray density (amount). In addition, a portion where no polymer exists locally (for example, in a spot shape) in the planar direction of the absorber 56 can also be provided.

(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 edges of the absorbent body 56 are protruded from the front and back of the absorbent body 56, and the protruding portions are crushed in the front and back directions and joined by a joining means such as a hot melt adhesive.

(Exterior sheet)
The exterior sheet 12 has a part constituting the front body F extending from the crotch part to the ventral side and a part constituting the rear body B extending from the crotch part to the back side, and both sides of the front body F As shown in FIG. 8, a waist opening WO for passing the wearer's torso and a pair of left and right leg openings LO for passing the legs are formed. It is what. Reference numeral 12A denotes a joining portion (hereinafter, this portion is also referred to as a side seal portion). The crotch portion means the center in the front-rear direction from the waist edge of the front body F to the waist edge of the back body B in the unfolded state, and the front part and the back part thereof are the front body F and Each back body B is meant.

  The exterior sheet 12 includes a waistline portion T defined as a front-rear direction range extending from the waist opening WO to the upper end of the leg opening LO, and a front-rear direction range of the portion forming the leg opening LO (the side seal portion 12A of the front body F). And an intermediate portion L defined as a front-rear direction region having a side seal portion 12A of the back body B. The waistline T can be divided into a “waist edge” W that conceptually forms the edge of the waist opening, and a “waist lower part” U that is a lower part than this. These lengths in the vertical direction vary depending on the size of the product and can be determined as appropriate. For example, the waist edge W may be 15 to 40 mm, and the waist lower portion U may be 65 to 120 mm. On the other hand, both side edges of the intermediate portion L are bundled along the circumference of the wearer's leg, and this is a portion into which the wearer's leg is put. As a result, the exterior sheet 12 has a substantially hourglass shape as a whole. The degree of tightness of the exterior sheet 12 can be determined as appropriate, and, as shown in FIGS. 1 to 8, the narrowest part may be narrower than the width of the interior body 200 in order to obtain a clean appearance. Although it is preferable, the narrowest part may be determined so as to be equal to or larger than the width of the interior body 200.

  As shown in FIGS. 3 to 5, the exterior sheet 12 is formed by bonding two sheet base materials 12 </ b> S and 12 </ b> H with an adhesive such as a hot melt adhesive, and is located on the inner side. Although the base material 12H extends only to the edge of the waist opening WO, the outer sheet base material 12S wraps around the waist side edge of the inner sheet base material 12H and is folded back to the inside. 12r is extended so that it may coat | cover up to the waist side edge part of the interior body 200. FIG.

The sheet base materials 12S and 12H can be used without particular limitation as long as they are in sheet form, but are preferably non-woven fabrics. 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. When using a nonwoven fabric, it is preferable that the basic weight shall be about 10-30 g / m < ² >.

Moreover, it is preferable that the total basis weight of the exterior sheet 12 is about 20 to 60 g / m ² so that the design of the printing sheet 25 to be described later can be satisfactorily viewed from the outer surface of the product through the exterior sheet 12. The total light transmittance specified in 7105 is preferably 40% or more, particularly 50% or more.

  The exterior sheet 12 is provided with elongate elastic members 15 to 19 such as thread rubber at a predetermined elongation rate between the sheet bases 12S and 12H in order to improve the fit to the waistline. As the elongated elastic elastic members 15 to 19, synthetic rubber or natural rubber may be used. For bonding the sheet bases 12S and 12H of the exterior sheet 12 and fixing the elongated elastic members 15 to 19 sandwiched therebetween, hot melt bonding or heat sealing or ultrasonic bonding by various coating methods is used. Can do. If the entire exterior sheet 12 is firmly fixed, the texture of the sheet is impaired, which is not preferable. By combining these, it is preferable that the elongated elastic elastic members 15 to 19 are firmly bonded, and other portions are not bonded or bonded weakly.

More specifically, the entire width direction is continuous between the inner surface of the inner sheet base 12H and the outer surface of the folded portion 12r of the outer sheet base 12S at the waist edge W of the rear body B and the front body F. As described above, the plurality of waist edge elastic elastic members 17 are fixed in a state of being spaced apart in the vertical direction and extended along the width direction at a predetermined extension rate. In addition, one or more of the waist edge elastic elastic members 17 disposed in a region adjacent to the waist lower portion U may overlap with the interior body 200 or may be overlapped with the interior body 200 in the width direction. You may each provide in the width direction both sides except a center part. The waist edge elastic elastic member 17 has a thickness of 155 to 1880 dtex, particularly 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 the rubber thread of 1.0mm about ^2), 3 to 22 present approximately at intervals of 4 to 12 mm, respectively elongation from 150% to 400%, preferably fixed in particular about 220-320%. Further, the waist edge elastic elastic members 17 need not all have the same thickness and elongation rate. For example, the elastic elastic members may have different thicknesses and elongation rates at the upper and lower portions of the waist edge W. .

  Further, between the outer side surface of the inner sheet base 12H and the inner side surface of the outer sheet base 12S in the lower waist U of the front body F and the rear body B, except for the widthwise central portion overlapping the interior body 200, A plurality of waist lower elastic elastic members 15, 19 made of an elongated elastic elastic member are continuously provided over the entire width direction on each of the upper side and both sides in the width direction, with a predetermined interval in the vertical direction It is fixed in an expanded state along the width direction at an expansion rate.

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 to It is preferable to fix the thread rubber of about 1.0 mm ² ) at an interval of 1 to 15 mm, particularly 3 to 8 mm, and about 5 to 30 at an elongation of 200 to 350%, particularly about 240 to 300%.

  Moreover, between the outer side surface of the inner sheet base material 12H and the inner side surface of the outer sheet base material 12S in the intermediate part L of the front body F and the back body B, except for the center part in the width direction overlapping the interior body 200, A plurality of intermediate elastic expansion / contraction members 16 made of an elongated elastic expansion / contraction member are provided in each part on both sides in the width direction so as to be continuous over the entire width direction. It is fixed in a stretched state along the direction.

The intermediate elastic elastic members 16 and 18 have a thickness of 155 to 1880 dtex, particularly 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 It is preferable to fix the thread rubber of about 1.0 mm ² ) at an interval of 5 to 40 mm, particularly 5 to 20 mm, and about 2 to 10 at an elongation of 150 to 300%, particularly 180 to 260%.

  As shown in the figure, when the waist lower elastic elastic member and the intermediate elastic elastic members 15, 19, 16, 18 are respectively provided on both sides in the width direction except for the central portion in the width direction overlapping the interior body 200. The interior body 200 does not shrink more than necessary in the width direction, so that it does not look bad or absorbs. In this form, in addition to the form in which the elastic stretchable member exists only on both sides in the width direction, the elastic stretchable member exists from one side of the width direction to the other side across the interior body 200, but overlaps the interior body 200. At the center in the width direction, the elastic expansion / contraction member is finely cut, and the contraction force does not act (substantially equivalent to not providing the elastic expansion / contraction member), and only the both sides in the width direction are configured as the contraction force acting portions. Are also included. Of course, the arrangement of the waist lower elastic members 15, 19, 16, and 18 is not limited to the above example, and the waist lower portion so that the elastic force acts on the entire width of the waist lower U. A part or all of the elastic elastic member and the intermediate elastic elastic members 15, 19, 16, 18 can be provided across the interior body 200 from one side in the width direction to the other side.

  In addition, when the elongated elastic elastic members 15 to 19 of each part cross a printing sheet 25 described later, when rubber containing titanium oxide is used as the elongated elastic elastic members 15 to 19, the content of titanium oxide is It is preferable to use a low one (for example, 2% or less) or one containing no titanium oxide.

(Post-processing tape)
A post-processing tape 70 (fixing means) can be provided at the center in the width direction on the outer surface of the rear body B of the exterior sheet 12. The post-processing tape 70 is for fixing the diaper 100 in a state of being rounded or folded so that the top sheet 30 is on the inner side and the front body F is on the inner side. As shown in FIG. 5, in the general post-processing tape 70, a base end portion 71 is fixed to the outer surface of the exterior sheet 12 with an adhesive or the like, and a portion on the front end side of the base end portion 71 is tri-folded. (Folded in a Z-shaped cross section) or folded in half, and the portion between the folded portions is fixed (temporarily fixed) by the temporary fixing adhesive 72 so as to be peelable. Moreover, while having the knob | pick part 73 colored in opaque colors, such as white, in the front-end | tip part, the part except this knob | pick part 73 is transparent or semi-transparent, Through the transparent or semi-transparent part in this post-processing tape 70, A design to be described later is visible from the outer surface side of the post-processing tape 70. Although a specific structure can be appropriately configured, in the illustrated embodiment, the whole is formed by connecting a plurality of transparent or semi-transparent substrates in the longitudinal direction, and a colored tape 74 is bonded to the knob 73. Is adopted.
At the time of disposal, the diaper 100 is rolled or folded so that the top sheet 30 is on the inside and the front body F is on the inside, and then the folded portion of the post-processing tape 70 is peeled off and spread, and the diaper 100 is rolled or folded. The diaper 100 is fixed with an adhesive so as to be wound from the rear body B of the diaper 100 to the outer surface on the opposite side over the waist opening WO. The post-processing tape 70 is particularly preferably a tri-fold shape that can be folded compactly when not in use and can be expanded into a long shape when in use.
Fixing means such as the post-processing tape 70 may be provided on the front body F or on both the back body B and the front body F.

(Print sheet)
A printing sheet 25 that is designed by printing is provided between the liquid-impermeable sheet 11 and the exterior sheet 12 (including the interlayer of the exterior sheet 12). The exterior sheet 12 may be omitted, and the print sheet 25 may be exposed on the outer surface. The printed sheet 25 in the illustrated example has a smaller area than the body on which the printed sheet 25 is disposed, and is provided separately for the front body F and the back body B, but passes through the crotch from the front body F. It can also be provided so as to continue to the back body B integrally.
Although the size and shape of the printing sheet 25 are not particularly limited, it is preferable to sufficiently increase the area in order to make the function sufficient. For example, the width of the printing sheet 25 is 50 to 120 of the width of the absorber 56. The length of the printing sheet 25 is preferably about 15 to 30% of the total length Y of the article on at least one side of the stomach side and the back side. Further, the shape of the print sheet 25 is preferably a rectangle as shown in the figure in that trim loss does not occur. You may cut it.
As the sheet base material of the printing sheet 25, a plastic film, non-woven fabric, paper, or the like can be used, but a bulky material having high air permeability is preferable. When using a plastic film, it is desirable to have moisture permeability in order to prevent stuffiness. Nonwoven fabrics and paper are preferable because they have moisture permeability, and when performing design printing, it is preferable to use nonwoven fabrics that are smooth and easy to print, and papers that are high in strength and difficult to bleed ink. Particularly preferred are basis weight 15 to 35 g / m ² approximately, crepe paper having a thickness of about 0.1 to 0.3 mm (thin paper) and a basis weight 10 to 25 g / m ² approximately, a thickness of about 0.1 to 0.3 mm Non-woven fabrics (especially spunbond nonwoven fabrics and SMS nonwoven fabrics having a spunbond portion having a fineness of about 1.0 to 3.0 dtex). When crepe paper is used, the crepe rate is preferably about 5 to 20%, particularly about 5 to 15%. If the crepe rate is 20% or more, the amount of ink fixed increases, but blurring occurs and is not suitable for design printing. If the crepe rate is 5% or less, the amount of fixing is small because the ink hardly penetrates.

(Exterior sheet split structure)
In the above-described example, the front body F to the back body B are continuously covered with the integral exterior sheet 12, but the exterior sheet covers the stomach side of the wearer's waist and the back side The front end portion of the interior body is connected to the inner surface of the center portion in the width direction of the abdominal side exterior sheet with a hot melt adhesive or the like, and the center portion in the width direction of the back side exterior sheet. The rear end of the interior body is connected to the inner surface by a hot melt adhesive or the like, and the form in which the abdominal exterior sheet and the back exterior sheet are not continuous on the crotch side and are separated from each other may be adopted. it can. This separation distance can be about 150 to 250 mm. In this case, the back surface of the liquid-impermeable sheet in the interior body is crotch so as to cover the entire back surface of the interior body, or to cover the entire portion exposed between the abdominal exterior sheet and the back exterior sheet. A partial exterior sheet can also be fixed. As the crotch outer sheet, the same material as that used for the outer sheet described above can be used. The crotch outer sheet also corresponds to the outer sheet of the present invention.

(indicator)
As shown in FIGS. 6 and 9 (a), a colorless and transparent indicator 80 is provided on the upper surface of the liquid-impermeable sheet 11, and on the lower surface of the portion located on the back side of the absorber 56 in the packaging sheet 58, A developer 81 for coloring the indicator 80 is contained in a range where the entire indicator 80 overlaps. The developer 81 can be contained in a range that overlaps a part of the indicator 80, or can be provided so as to cover the same range as the indicator 80 or more. It can be provided so as to be continuous along the front-rear direction through the indicator 80. When there is excretion in such a disposable diaper, as shown in FIG. 9 (b), the developer 81 is dissolved in the excretion liquid and contacts the indicator 80 together with the excretion liquid, so that the indicator 80 is colored. Yes. FIG. 8 shows a state in which the indicator 80 is displayed. Thus, when the upper sheet containing the developer 81 is a portion located on the back side of the absorber 56 in the packaging sheet 58 and the lower sheet on which the indicator 80 is provided is the liquid-impermeable sheet 11, There is an advantage that the colorant 81 is easily dissolved in the excretion liquid, and the excretion liquid containing the color developer 81 efficiently contacts the indicator 80.

  The shape of the indicator 80 can be determined as appropriate. In addition to a geometric shape such as a straight line along the front-rear direction, the shape of the illustration of an animal, character, character, or the like in the front-rear direction as shown in the figure. Appropriate designs such as those arranged at appropriate intervals can be used.

  In the structure in which the developer 81 is contained in the packaging sheet 58, the entire developer 81 remains in the form of a layer on the outer surface of the packaging sheet 58 (illustrated form), and the entire developer 81 is the packaging sheet. 58, and a form in which a part of the developer 81 is absorbed and held in the packaging sheet 58 and the remaining part is layered on the outer surface of the packaging sheet 58 is included. . Further, the upper sheet, that is, the developer 81 containing member is not limited to the packaging sheet 58 as long as it is a member between the absorber 56 and the indicator 80, and other liquid permeation dedicated or provided for another purpose. It can also be a sex member. The member that provides the lower sheet, that is, the indicator 80 is not limited to the liquid-impermeable sheet 11 as long as it is behind the member containing the developer 81, and may be another member that is dedicated or provided for another purpose. Alternatively, a liquid permeable material such as a nonwoven fabric may be used. When the indicator 80 is provided on the liquid-impermeable sheet 11, the indicator 80 adheres in layers on the liquid-impermeable sheet 11 (illustrated form), but when the indicator 80 is provided on the liquid-permeable member. Is a form in which the entire indicator 80 remains in a layered manner on the outer surface of the liquid permeable member, a form in which the entire indicator 80 is absorbed and held inside the liquid permeable member, and a part of the indicator 80 is liquid permeable. Any form of absorbing and holding in the inside of the member and remaining in a layered manner on the outer surface of the liquid-permeable member can be used.

As shown in the figure, for the part N2 of the developer 81 in the packaging sheet 58, the part of the packaging sheet 58 located on the back side of the absorber 56 is fixed to the upper member, that is, the absorber 56 in the figure. Therefore, it is more preferable that the hot melt adhesive 91 is not applied. After passing through the absorbent body 56 or its surroundings, the excreted liquid is supplied to a portion of the packaging sheet 58 located on the back side of the absorbent body 56, and contacts the indicator 80 after the developer 81 is melted and mixed here. Therefore, the liquid permeability of the portion N2 containing the developer 81 in the packaging sheet 58 affects the color development efficiency. It should be noted that, even in the adhesion on the upper side of the portion N2 containing the developer 81, the hot melt adhesive 91 can be used if it is intermittently applied at an application amount of 5 g / m ² or less.

  Further, in consideration of the color development principle of the indicator 80 described above, the liquid permeability of the portion of the absorber 56 that overlaps the portion containing the developer 81 affects the color development efficiency. It is also preferable to provide a highly liquid-permeable portion 56T having a higher liquid permeability in the thickness direction compared to the surroundings in a region overlapping with the entire portion including the developer 81 (may be a part or a larger range). Such a highly liquid-permeable portion 56T has a relatively low fabric basis weight and a high basis weight of the absorbent polymer particles in the absorbent body 56, and is provided with a perforation hole penetrating in a front and back direction in a predetermined portion of the absorbent body 56. Or the like.

Further, as shown in the figure, if the superabsorbent polymer particles are present on the upper surface of the portion of the packaging sheet 58 located on the back side of the absorbent body 56, even if the developer 81 is dissolved in the excretory fluid, May be absorbed by the superabsorbent polymer particles, and insufficient supply of the developer to the indicator 80 may occur. Therefore, as shown in FIG. 9C, the superabsorbent polymer particles (not shown) contained in the absorber 56 are packaged between the absorber N-containing portion N2 and the absorber 56 in the packaging sheet 58. It is also a preferable form to provide a liquid-permeable shielding layer 57 that shields the developer-containing portion N2 of the sheet 58 from coming into contact. Providing such a liquid-permeable shielding layer 57 makes it difficult for the high-absorbent polymer particles to absorb the excretory liquid containing the developer 81 and insufficiently supply the developer to the indicator 80. The liquid-permeable shielding layer 57 is not particularly limited, but a non-woven fabric having a fineness of about 1.0 to 4.0 dtex and a basis weight of about 10.0 to 40.0 g / m ² is desirable. A laminated nonwoven fabric (such as an SMS nonwoven fabric or an SMMS nonwoven fabric) in which a melt-blown nonwoven fabric layer is sandwiched between a nonwoven fabric and a spunbond nonwoven fabric layer is preferred, and a hydrophilic nonwoven fabric is preferred.

Furthermore, as shown in FIG. 10, a liquid-permeable spacer 82 is interposed between the portion N2 containing the developer 81 in the packaging sheet 58 and the portion having the indicator 80 in the liquid-impermeable sheet 11, thereby developing the developer. It is also a preferable form that the colorant 81 and the indicator 80 are not in contact with each other. Thereby, even if the content portion N2 of the developer 81 absorbs a certain amount of moisture under high temperature and high humidity, it is difficult for the developer 81 to be supplied to the indicator 80, so that erroneous color development is further less likely to occur. The liquid-permeable spacer 82 is not particularly limited, but a non-woven fabric having a fineness of about 1.0 to 4.0 dtex and a basis weight of about 10.0 to 40.0 g / m ² is desirable, and an air-through non-woven fabric is particularly suitable. A hydrophilic non-woven fabric is preferred.

  As the indicator 80, a known one can be used without particular limitation as long as it contains a color former that changes from colorless to colored by a developer, but one having a leuco dye as a color former is preferable. The indicator 80 using a leuco dye can be formed by mixing a leuco dye as a color former with a binder and a solvent to form a coating solution, and then coating the target member in a predetermined shape.

  The leuco dye is not particularly limited, but N-acetyl auramine, N-phenyl auramine, 3,6-dimethyloxyfluorane, 2- (phenyliminoethanedilidene) -3,3-trimethyl-indoline, 2- {2- [4- (dodecyloxy) -3-methoxyphenyl] -ethenyl} quinoline, 1,3-dimethyl-6-diethylaminofluorane, 1,3,3-trimethyl-indolino-7′-chloro- β-naphthospiropyran, 3-cyclohexylamino-6-chlorofluorane, 3-diethylamino-6-methyl-7-chlorofluorane, 2-bromo-3-methyl-6-dibutylaminofluorane, 3-diethylamino-benzo [Α] -fluorane, 6-diethylamino-benzo [α] -fluorane, 3-diethylamino-7, -Benzofluorane, 3-diethylamino-7-chlorofluorane, 6-p-tolyl, ethylamino-2-methylfluorane, 3,3-bis (1-n-butyl-2-methyl-indoyl-3) Phthalate, 3,3-bis (1-ethyl-2-methyl-indoyl-3) phthalate, 3,6-bis (diethylamino) fluorane-γ- (4-nitro) -anilinolactam, rhodamine B lactam, ethyl leuco Methylene blue, benzoyl leucomethylene blue, methoxybenzoyl leucomethylene blue, crystal violet lactone, di-β-naphthospiropyran, 3- (4-dimethylamino-2-ethoxyphenyl) -3- (1-ethyl-2-methyl-3-indolyl) ) -4-Azaphthalide, 3- (4-diethylamino-2-methylthio) Nyl) -3- (1-ethyl-2-methylindolyl-3-yl) -4-azaphthalide, 3- (4-diethylaminophenyl) -3- (1-ethyl-2-methylindoyl-3) phthalide 3,7-bis (dimethylamido) -10-benzoylphenocyanazine, tri (4-dimethylaminophenyl) methane, 3,3-bis (4-diethylamino-2-ethoxyphenyl) -4-azaphthalide, malachite green Lactone, 2-dibenzylamino-6-diethylaminofluorane, 3-diethylamino-7-dibenzoylaminofluorane, 3-diethylamino-7-chloroanilinofluorane, 3,6,5′-tri (dimethylamino) Fluorene-9-spiro-1 ′-(3′-isobenzofuran), 3-cyclohexylmethylamino-6- Til-7-anilinofluorane, 3-diethylamino-6-methyl-7-anilinofluorane, 3-dibutylamino-6-methyl-7-anilinofluorane, 6-isoamyl, ethylamino-3-methyl 2-anilinofluorane, 3-diethylamino-6-methyl-7-2,4-chiridenofluorane, 3-diethylamino-6-methyl-7-kilidenofluorane, 3-diethylamino-6- Methyl-7- (m-toluideno) -fluorane, 2- (2-chloroanilino) -6-diethylaminofluorane, 2- (2-chloroanilino) -6-dibutylaminofluorane, 2-anilino-3-methyl-6 -One or more kinds of electron-donating color-forming organic compounds selected from the group of diethylaminofluorane can be suitably used.

  The binder may be appropriately selected. For example, acrylic resin, urethane resin, butyric acetate fiber-based resin, nitrified cotton, polyamide-based resin, gum copal, gum rosin, shellac, vinyl acetate vinyl chloride copolymer resin, and the like can be preferably used. .

  The solvent may be appropriately selected. For example, toluene, methyl ethyl ketone, ethyl alcohol, isopropyl alcohol, and the like can be preferably used.

  When a colorless and transparent indicator 80 using a leuco dye as a color developer and a developer 81 for color development are used in combination, the developer 81 is placed on the back side of the absorber 56 in consideration of the color development efficiency. It is preferable to arrange adjacent to each other with the indicator 80 facing down. Therefore, in the normal case, the developer 81 is contained in the upper sheet (in the illustrated embodiment, the packaging sheet 58) located on the back side of the absorber 56, and the lower sheet (in the illustrated embodiment, the liquid impermeable) is positioned below the developer 81. Preferably, an indicator 80 is provided on the conductive sheet 11). However, in a disposable diaper, it is common to bond with a hot melt adhesive so as not to cause a gap between sheets, and when this is applied as it is, there is a certain amount of space between the portion containing the developer 81 and the indicator 80. It was found that the developer 81 is not easily brought into contact with the indicator 80 by being blocked by the amount of hot melt adhesive, and the coloring efficiency is lowered. Not only that, but when stored under high temperature and high humidity, the hot melt adhesive application part (it was difficult to tell if it was the hot melt adhesive application part) was selectively colored. I also found the problem that it ended up (the reason is not clear).

  Accordingly, as shown in the figure, at least the portion containing the developer 81 in the packaging sheet 58 and the portion N1 having the indicator 80 in the liquid-impermeable sheet 11 are located on the back side of the absorber 56 in the packaging sheet 58. A form in which the hot melt adhesive 90 for bonding the part and the liquid-impermeable sheet 11 is not applied is desirable. Such a hot melt adhesive non-application portion N1 may be continuous in the front-rear direction, or may be provided intermittently in the front-rear direction depending on the arrangement of the indicator or the developer. In particular, it is desirable to bond the front and rear edges. When such a non-application portion N1 is provided, the portion between the developer 81 and the indicator 80 is hardly blocked by the hot-melt adhesive 90, and the developer 81 can efficiently contact the indicator 80. In addition, even when stored under high temperature and high humidity, selective coloring of the hot melt adhesive application portion is prevented.

In addition, in the part N1 which has the indicator 80 in the content part of the developer 81 in the packaging sheet 58 and the liquid impermeable sheet 11, the part located in the back side of the absorber 56 in the packaging sheet 58 and the liquid impermeable sheet 11 are used. If problems such as wrinkles occur if not bonded, it is possible to bond with hot melt adhesive 90 as long as intermittent coating is performed at a coating amount of 5 g / m ² or less. However, in this case, it is somewhat inferior in terms of prevention of excretory fluid blocking and selective color development. Note that “intermittent application” means application in a pattern in which a space is provided on an adhesive portion such as a spiral shape, a stripe shape, or a dot shape.

  In addition, the indicator 80 using a leuco dye as a color former has poor light resistance, and when the purchased product is stored in a place exposed to sunlight, the indicator 80 may turn yellow and the color may be faded. In particular, when the ultraviolet transmittance of the covering portion covering the outside of the indicator 80 is 45 to 99%, the possibility increases. Therefore, it is also proposed that the indicator 80 contains an ultraviolet absorber. Thereby, the yellow change of the indicator 80 by sunlight and the fading of coloring can be prevented effectively. The ultraviolet absorber is not particularly limited, but a benzotriazole ultraviolet absorber, a triazine ultraviolet absorber, a benzophenone ultraviolet absorber, a salicylate ultraviolet absorber, an acrylonitrile ultraviolet absorber, a hindered amine light stabilizer, One or a plurality of substances selected from the group of benzoate-based light stabilizers can be suitably used.

  In addition to or instead of this, an ultraviolet absorber can be contained in at least one of the exterior sheet 12 and the liquid-impermeable sheet 11. In this case, in addition to coating the exterior sheet 12 and the liquid-impermeable sheet 11 with a coating solution containing an ultraviolet absorber, it is also preferable to mix the ultraviolet absorber into the raw material resin of the sheet.

  The composition of the indicator 80 (product state) may be appropriately determined. For example, the leuco dye is 0.05 to 30.0% by weight, the binder is 0.01 to 10.0% by weight, and the ultraviolet absorber is 0.5%. It can be contained in an amount of ˜5% by weight.

  On the other hand, after the developer 81 is mixed with a solvent to form a coating solution, it can be contained in the target member by applying the developer 81 in a predetermined shape. The developer 81 is not particularly limited. For example, calcium chloride, magnesium chloride, thiamine hydrochloride, zinc chloride, salicylic acid, zinc salicylate, bisphenol A, adipic acid, ascorbic acid, benzoic acid, gallic acid, gallic acid One or more electron acceptors selected from the group of methyl, ethyl gallate, propyl gallate, glycolic acid, succinic acid, tartaric acid, tannic acid, nicotinic acid, lactic acid, fumaric acid, malic acid, phosphoric acid, citric acid A color developing compound can be preferably used.

  It is preferable that the developer 81 also contains an ultraviolet absorber. Thereby, the yellow change of the indicator 80 by sunlight and the fading of coloring can be prevented effectively. One or a plurality of ultraviolet absorbers can be selected and used from those described above, and can be the same as or different from those used for the color former.

  The solvent of the developer 81 may be appropriately selected. For example, methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, sec-butyl alcohol, isobutyl alcohol, other esters aliphatic hydrocarbons, Ketones and the like can be preferably used.

The content of the developer 81 (weight per unit area of the target sheet) may be determined as appropriate, and may be, for example, about 3.0 to 10.0 g / m ² .

On the other hand, as the liquid-impermeable sheet 11, it is common to use a moisture-permeable sheet having a porous structure. When such a moisture-permeable liquid-impermeable sheet 11 is used, the leuco dye of the indicator 80 is used. If it dissolves in the excretion liquid, it may pass through the back side of the liquid-impermeable sheet 11 through the vent hole, and may contaminate contact objects such as clothes and hands. On the other hand, when the water vapor transmission rate is suppressed to 2,000 to 5,000 g / 24 h / m ² , it is possible to prevent such back-through of the leuco dye. The moisture permeability means a value measured according to JIS Z 0208 “moisture-proof packaging material moisture permeability test method (cup method)”.

(High diffusion part and diffusion sheet)
Characteristically, as shown in FIG. 11 to FIG. 14, the upper sheet containing the developer, that is, the entire portion overlapping the indicator in the portion located on the back side of the absorbent body in the illustrated packaging sheet, Compared to the thickness direction, it is configured as high diffusion portions 58h, 59 having high liquid diffusibility in the direction orthogonal to the thickness direction. As long as the high diffusion portions 58 h and 59 are provided so as to include the entire indicator 80, the high diffusion portions 58 h and 59 can be provided so as to extend over the same range as the indicator 80, for example, in the same size or larger than the indicator 80. It can be provided only in a portion having the indicator 80 (illustrated form) or can be provided so as to be continuous along the front-rear direction through the indicator 80. By providing such high diffusion portions 58 h and 59, the excretory liquid diffuses over the entire portion overlapping the indicator 80 in the packaging sheet 58 including the developer 81, dissolves the developer 81, and supplies it to the entire indicator 80. can do. Therefore, the display of the indicator 80 becomes difficult to be interrupted. For example, it is possible to suppress a situation in which the overall appearance of the indicator 80 such as an animal or a character does not appear and the face or the torso is cut and the appearance deteriorates or the child awakens.

The high diffusion portions 58h and 59 can be appropriately formed. As shown in FIGS. 11 and 12, the packaging sheet 58 is a non-woven fabric, and a pattern having a planar shape such as a circle or a rectangle over the entire portion overlapping the indicator 80 is used. Thus, a high-density portion 58h obtained by compressing in the thickness direction by embossing or the like can be obtained. The concave portion due to compression in the high-density portion 58h may be provided on the surface of the packaging sheet 58 on the side of the absorber 56 as shown in FIG. 12 (a), but is liquid-impermeable as shown in FIG. 12 (b). It is preferable to provide it on the surface on the sheet 11 side, but it may be provided on both surfaces although not shown. Such a high-density portion 58h is preferable because the liquid suction force due to capillary action is relatively high, so that not only liquid diffusion within the range of the high-density portion 58h but also liquid suction from the surroundings is performed. In addition, as a nonwoven fabric which comprises the packaging sheet 58 in this case, a hydrophilic nonwoven fabric with a fineness of about 1.0 to 4.0 dtex and a basis weight of about 10.0 to 40.0 g / m ² is desirable. A laminated nonwoven fabric (such as an SMS nonwoven fabric or an SMMS nonwoven fabric) in which a meltblown nonwoven fabric layer is sandwiched between bond nonwoven fabric layers is suitable. The density of the high density portion 58h is about 30.0~40.0g / m ^3, the density of the surrounding portion is preferably set to 15-25 g / m ³ approximately. This form has an advantage that a high diffusion portion can be formed without adding a material.

On the other hand, as shown in FIGS. 13 and 14, a diffusion sheet 59 having a high liquid diffusibility in a direction perpendicular to the thickness direction as compared with the upper sheet is formed on the entire portion overlapping the indicator 80 on at least one of the upper and lower surfaces of the upper sheet. The high diffusion portions 58h and 59 can also be formed by pasting. The diffusion sheet 59 may be provided on the surface on the absorbent body 56 side of the packaging sheet 58 as shown in FIG. 14 (a), but on the surface on the liquid impermeable sheet 11 side as shown in FIG. 14 (b). It is preferable to provide them, but they may be provided on both sides although not shown. As such a diffusion sheet 59, a paper having a Klem water absorption of 10 to 150 mm after 5 minutes measured according to “Paper and paperboard—Water absorption test method—Krem method” defined in JIS P 8141: 2004. Or a nonwoven fabric is suitable. As the non-woven fabric, a hydrophilic non-woven fabric having a fineness of about 1.0 to 4.0 dtex and a basis weight of about 10.0 to 40.0 g / m ² is desirable, and a melt-blown non-woven fabric is particularly suitable. This form is preferable in that it is not necessary to form the entire packaging sheet 58 with a nonwoven fabric.

  The present invention can be used regardless of the form of a pants type disposable diaper as described above, a tape type, a pad type or the like.

  DESCRIPTION OF SYMBOLS 11 ... Liquid impervious sheet, 12 ... Exterior sheet, 12r ... Folded part, 25 ... Print sheet, 200 ... Interior body, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbing element, 56 ... Absorber, 56T ... Highly permeable part, 58 ... packaging sheet, 58h, 59 ... high diffusion part, 58h ... high density part, 59 ... diffusion sheet, 60 ... side solid gather, 62 ... gather sheet, 80 ... indicator, 81 ... developer 82 ... Liquid permeable spacer.

Claims (4)

In a disposable diaper comprising a liquid-permeable top sheet, a liquid-impermeable sheet, and an absorbent body interposed therebetween,
A lower sheet positioned on the back side of the absorber, and a liquid-permeable upper sheet positioned between the lower sheet and the absorber,
On the lower sheet, a colorless and transparent indicator is provided so as to come into contact with excretion fluid coming from above,
Applying a developer for coloring the indicator to a portion at least partially overlapping the indicator in the upper sheet,
The entire portion overlapping the indicator in the upper sheet is a high diffusion portion with high liquid diffusivity in the direction perpendicular to the thickness direction compared to the surroundings,
A disposable diaper characterized in that the developer dissolves in excretion fluid and contacts the indicator together with excretion fluid, and the indicator develops color.   The disposable diaper according to claim 1, wherein the upper sheet is a nonwoven fabric, and the high diffusion portion is a high-density portion formed by compression in the thickness direction.   The high diffusion portion is formed by attaching a diffusion sheet having a high liquid diffusibility in a direction perpendicular to the thickness direction compared to the upper sheet to the entire portion overlapping the indicator on at least one of the upper and lower surfaces of the upper sheet. The disposable diaper according to claim 1.   The disposable diaper of any one of Claims 1-3 provided so that the said developer application part may overlap with the whole said indicator.

Images