JP2009160130A - Disposable absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disposable absorbent article capable of demonstrating a large temperature change on an article surface. <P>SOLUTION: In the disposable absorbent article equipped with an absorbent part with an absorbent element 50 interposed between a liquid permeable surface sheet 30 and a liquid nonpermeable sheet 11 at a part including a crotch part, on the surface of an absorber 56 containing superabsorbent polymer particles at least on the surface side layer, a particle-like temperature change substance 40 for cooling or heating urine by contact with the urine is sprayed and the urine cooled or heated by the temperature change substance 40 is absorbed and held by the superabsorbent polymer on the surface side layer of the absorber 56. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to disposable absorbent articles such as disposable diapers and disposable absorbent pads used for so-called toilet training.

Traditionally, disposable diapers for training have been designed to make the wearer perceive urination by bringing the urine into contact with the skin and emphasizing the discomfort caused by moisture. Since there is a possibility that it may lead to fogging, technical development is being carried out to make the wearer perceive urination while keeping urine away from the skin.
A typical example is the use of a substance that causes a temperature change in urine by contact with urine, such as sorbitol (see, for example, Patent Documents 1 and 2). In the technique described in Patent Document 1, it is proposed to arrange a member containing a temperature change substance such as sorbitol on the body side of the absorption element. Further, in the technique described in Patent Document 2, it is proposed that an element formed by sandwiching a temperature change substance such as sorbitol between an permeable layer and an impermeable layer is disposed on the absorbent core.
Japanese Patent No. 3922722 Japanese Patent No. 3830901

However, in the technique described in Patent Document 1, since the urine cooled or heated by the temperature change substance enters the absorption element and moves to the back side, the more the amount of urine, the more the temperature change on the surface of the article in contact with the body. There was a problem of being scarce.
In the technique described in Patent Document 2, since urine cooled or heated by the temperature change substance is temporarily stored on the impermeable layer, the cooling or heating by the temperature change substance cannot catch up when the amount of urine increases. There was a problem that the change from the urine temperature during urination was small.
Then, the main subject of this invention is providing the disposable absorbent article which can exhibit a big temperature change in the article | item surface.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
In a disposable absorbent article provided with an absorption part in which an absorption element is interposed between a liquid-permeable top sheet and a back side sheet, in a part including a crotch part,
The absorbent element includes an absorbent body including at least a superabsorbent polymer in a surface side layer, a temperature change substance disposed on the surface of the absorbent body for cooling or heating urine by contact with urine, and the absorbent body. And a covering sheet that wraps the temperature change substance,
A disposable absorbent article characterized by that.

(Function and effect)
In the present invention, urine that has permeated the surface sheet during urination is initially held by the superabsorbent polymer on the surface side layer of the absorbent body after being cooled or heated by the temperature change substance. Effectively communicates temperature changes. After the absorption of the superabsorbent polymer in the surface side layer is saturated, the urine is absorbed and retained in the surface side layer of the absorber even if the urine is insufficiently cooled or heated due to a decrease in the temperature change substance or the like. Without moving to the back side in the absorbent body. In other words, fully cooled or heated urine is absorbed and retained by the superabsorbent polymer in the surface side layer of the absorber, and urine that has become insufficiently cooled or heated is not retained in the surface side layer of the absorber but on the back side. Therefore, the effect of cooling or heating by the temperature change substance is effectively transmitted to the article surface side, and a large temperature change is brought about on the article surface. Moreover, urine is retained in the superabsorbent polymer, and urine that has permeated through the topsheet is unlikely to return to the skin side, so that a smooth feeling of use is obtained and the burden on the skin is reduced.

<Invention of Claim 2>
The disposable absorbent article according to claim 1, wherein the absorbent body has a higher density of the superabsorbent polymer on the front side than on the back side.

(Function and effect)
By adopting such a structure, more cooled or heated urine can be held on the surface side of the absorber, and the temperature change on the article surface can be further increased.

<Invention of Claim 3>
In a disposable absorbent article provided with an absorption part in which an absorption element is interposed between a liquid-permeable top sheet and a back side sheet, in a part including a crotch part,
The absorbent element includes an absorber, a temperature change layer that is disposed on the surface of the absorber, and contains a temperature change substance that cools or heats urine by contact with urine and a superabsorbent polymer, and the absorber. And a covering sheet that wraps the temperature change layer,
A disposable absorbent article characterized by that.

(Function and effect)
In the present invention, the urine supplied to the temperature change layer is cooled or heated by the temperature change substance, and is then quickly absorbed by the superabsorbent polymer without transferring heat to other members. The same effects as those of the first aspect of the invention can be achieved. In the invention described in this section, since the urine cooled or heated by the temperature change substance can be held at a position closer to the skin, the temperature change on the article surface can be further increased.

<Invention of Claim 4>
The liquid-permeable surface sheet is made of a nonwoven fabric having a thickness of 0.5 mm or less and a basis weight of 10 to 40 g / m ² .
The covering sheet is made of crepe paper or nonwoven fabric having a thickness of 0.2 mm or less and a basis weight of 5 to 25 g / m ² .
The portion that overlaps at least the portion having the superabsorbent polymer between the liquid-permeable surface sheet and the absorbent element has no other member,
The temperature-changing substance causes endothermic reaction when dissolved in urine, cools urine, and has a solubility in 100 ml of water of 20 ml of 100 ml of 20 ml of temperature of 30 g or more,
The basis weight of the temperature change substance is 300 to 800 g / m ² ,
The area of the portion having the temperature change substance is 2,500 to 20,000 mm ² ;
The total amount of heat change that can occur in the absorber due to the temperature change material is 50 cal or more,
The calorie change per unit area of the portion having the temperature change substance is 1 cal / cm ² or more,
The superabsorbent polymer has an absorption rate of 50 seconds or less,
The basis weight of the superabsorbent polymer is 50 to 400 g / m ² ,
The area of the portion having the superabsorbent polymer is 2,500 to 20,000 mm ² .
The disposable absorbent article according to any one of claims 1 to 3.

(Function and effect)
In the form including the temperature change substance and the superabsorbent polymer in the covering sheet of the absorbent element, the structure as described in this section is adopted, and the type, performance and quantity of the temperature change substance and the high absorption as described in this section are adopted. It is preferable to use a functional polymer. The absorption rate is the time required for a 2 g sample to absorb 50 g of physiological saline, and is measured based on JIS K 7224-1996 (the same applies hereinafter).

<Invention of Claim 5>
In a disposable absorbent article provided with an absorption part in which an absorption element is interposed between a liquid-permeable top sheet and a back side sheet, in a part including a crotch part,
Between the liquid-permeable surface sheet and the absorbent element, a temperature change substance that cools or heats urine by contact with urine and a superabsorbent polymer that absorbs and holds urine cooled or heated by the temperature change substance are included. With temperature change layer,
A disposable absorbent article characterized by that.

(Function and effect)
In the invention described in this section, the urine that has permeated through the surface sheet at the time of urination is promptly after being cooled or heated by the temperature-changing substance in the temperature-changing layer initially located between the liquid-permeable surface sheet and the absorbing element. Although it is retained by the superabsorbent polymer on the surface side layer of the absorber, after the absorption of the superabsorbent polymer in the temperature change layer is saturated, urine cooling or heating becomes insufficient due to a decrease in temperature change substances, etc. However, the urine is not absorbed and held in the temperature change layer, but is moved to the absorption element on the back side and absorbed and held. That is, fully cooled or heated urine is absorbed and retained by the high-absorbency polymer in the temperature change layer between the liquid-permeable surface sheet and the absorbent element, and urine that has been insufficiently cooled or heated becomes a temperature change layer. Since it moves to the absorption element on the back surface side without being held, the effect of cooling or heating by the temperature change substance is effectively transmitted to the article surface side, and a large temperature change is brought about on the article surface. In the invention described in this section, since the urine cooled or heated by the temperature change substance can be held at a position closer to the skin, the temperature change on the article surface can be further increased. Furthermore, urine is retained in the superabsorbent polymer, and urine that has permeated through the surface sheet is unlikely to return to the skin side, so that a smooth feeling of use is obtained and the burden on the skin is reduced.

<Invention of Claim 6>
The liquid-permeable surface sheet is made of a nonwoven fabric having a thickness of 0.5 mm or less and a basis weight of 10 to 40 g / m ² .
The portion that overlaps at least the portion having the superabsorbent polymer between the liquid-permeable surface sheet and the temperature change layer has no other member,
The temperature-changing substance causes endothermic reaction when dissolved in urine, cools urine, and has a solubility in 100 ml of water at a temperature of 20 ° C. of 30 g or more,
The basis weight of the temperature change substance is 300 to 800 g / m ² ,
The area of the portion having the temperature change substance is 2,500 to 20,000 mm ² ;
The total amount of heat change that can be generated in the temperature change layer by the temperature change material is 50 cal or more,
The calorie change per unit area of the portion having the temperature change substance is 1 cal / cm ² or more,
The superabsorbent polymer has an absorption rate of 50 seconds or less,
The basis weight of the superabsorbent polymer is 50 to 400 g / m ² ,
The area of the portion having the superabsorbent polymer is 2,500 to 20,000 mm ² .
The disposable absorbent article according to claim 5.

(Function and effect)
In the form having a temperature change layer containing a temperature change substance and a superabsorbent polymer between the liquid-permeable surface sheet and the absorbent element, the structure as described in this section is adopted, and the type as described in this section is adopted. Preferably, performance and quantity of temperature change material and superabsorbent polymer are used.

<Invention of Claim 7>
The disposable absorbent article according to any one of claims 1 to 6, comprising a portion having the superabsorbent polymer on at least one of front and rear sides and a width direction both sides of the portion having the temperature change substance.

(Function and effect)
In the absorbent article, since urine diffuses in the front-rear direction and the width direction of the article in the absorption part, by adopting the structure as described in this section, among the urine cooled or heated in the part having the temperature change substance, The amount diffused around the portion having the temperature change substance can be effectively absorbed and held by the superabsorbent polymer. Therefore, a large temperature change can be caused in a wider range of the article surface.

  As described above, according to the present invention, there are advantages such as a disposable absorbent article that can exhibit a large temperature change on the article surface.

  Hereinafter, although an example of a pants-type disposable diaper (training pants) is drawn and explained about one embodiment of the present invention, it goes without saying that the present invention can also be applied to a tape-type disposable diaper, a pad-type absorbent article, and the like. Nor.

<Basic structure example of pants-type disposable diapers>
1 to 9 show an example of a pants-type disposable diaper. In each figure, “front-rear direction” means a direction connecting the ventral side (front side) and back side (rear side), “width direction” means a direction (left-right direction) orthogonal to the front-rear direction, “Up and down direction” means the wearing state of the diaper, that is, the direction perpendicular to the waistline direction when the diaper is folded in two at the crotch part so that the both sides of the front body and the back side of the diaper are overlapped, in other words It means the direction connecting the waist opening WO side and the crotch part side.

  This pants-type disposable diaper has an abdominal exterior sheet 12F that covers the abdominal side of the wearer's girth and a back exterior sheet 12B that covers the back side, and both side edges in the width direction of the abdominal exterior sheet 12F. The both side edges in the width direction of the back side exterior sheet 12B are welded and joined by heat sealing, ultrasonic welding, or the like over the entire vertical direction, so that the cylindrical waistline portion 100 is formed. Reference numeral 12A denotes an individual welded portion, and a group of the welded portions 12A constitutes a side seal portion. When the backside exterior sheet 12B extends below the welded portion 12A as shown in the figure, the backside sheet is subjected to processing such as heat sealing integrally in the vertical range including this portion, The extension weld part 12E can be provided in the extension part 14. FIG. By providing the extended welded portion 12E, it is possible to prevent the second elongated elastic elastic member 16 from being pulled in the backside extended portion 14 described later. In this case, in consideration of the ease of tearing of the side portions, the welded portion 12A is generally composed of a group of small welded portions, and a bonding pattern with a low ratio of the welded area in the welded portion 12A is generally used. Since it is not necessary to consider the ease of tearing in the welded portion 12E, the second elongated elastic elastic member 16 is surely welded and fixed by making the ratio of the welded area higher than the welded portion 12A. May be. Further, the extended welded portion 12E can be welded by a curved line at the edge of the collar cover portion 14C, and the second elongated elastic elastic member 16 of the collar cover portion 14C can be prevented from being pulled.

  In addition, the front end portion of the interior body 200 is connected to the inner surface of the belly side exterior sheet 12F in the width direction center portion of the waistline portion 100 by a hot melt adhesive or the like, and the interior body is disposed on the inner surface of the back side exterior sheet 12B in the width direction center portion. The rear end portions of 200 are connected by a hot melt adhesive or the like, and the abdominal exterior sheet 12F and the back exterior sheet 12B are not continuous on the crotch side and are separated from each other. This separation distance Y can be about 150 to 250 mm. Although not shown, a form in which the abdominal exterior sheet 12F and the back exterior sheet 12B are continuous in the crotch part, that is, a form in which the abdomen side to the back side are continuously covered with an integral exterior sheet may be employed.

  As can be seen from FIGS. 7 and 8, the upper opening of the waistline portion 100 becomes a waist opening WO through which the wearer's torso passes, and the lower edge of the waistline portion 100 and the interior body 200 on both sides in the width direction of the interior body 200. The portions surrounded by the side edges are leg openings LO through which the legs pass. In the state where each welded portion 12A is peeled off and developed, an hourglass shape is formed as shown in FIG. The interior body 200 extends from the back side through the crotch part to cover the abdomen side, and is a part that receives the excrement and absorbs and retains the liquid. This is the part that supports the wearer.

(Exterior sheet)
As shown in FIGS. 4 and 5, the abdominal exterior sheet 12 </ b> F and the back exterior sheet 12 </ b> B are formed by laminating two sheet-like materials 12, 12. Although it extends only to the edge of the waist opening WO, the outer sheet-like material 12 positioned on the outside wraps around the edge on the waist side of the inner sheet-like material 12 and is folded back inside. 12r is extended so that it may cover to the waist side edge part of the interior body 200, and it is being fixed to the opposing surface with the hot-melt-adhesive agent. The sheet-like material 12 is not particularly limited as long as it can be joined by welding, but is preferably a nonwoven fabric. 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 >.

  And on the abdominal side exterior sheet 12F and the back side exterior sheet 12B, in order to improve the fit to the waist, elongated elastic elastic members 15-19 such as rubber thread are stretched between the sheet-like materials 12 and 12 with a predetermined extension. Is provided at a rate. As the elongated elastic elastic members 15-18, 19T, 19U, synthetic rubber or natural rubber may be used. Hot melt bonding, heat sealing, or ultrasonic bonding can be used for bonding the sheet materials 12 and 12 of the exterior sheets 12F and 12B and fixing the elongated elastic members 15 to 19 sandwiched therebetween. . If the entire surface of the exterior sheets 12F and 12B 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 back-side exterior sheet 12B includes a back-side body portion 13 that occupies the same vertical range as the side seal portions by the welded portion 12A group, and a back-side extension that extends below the back-side body portion 13. And an exit portion 14. The back extension part 14 has a width direction center part 14 </ b> M overlapping with the interior body 200, and a buttock cover part 14 </ b> C extending on both sides thereof.

  The shape of the dorsal extension 14 can be determined as appropriate, but in the illustrated example, the upper end of the dorsal extension 14 has the same width as the dorsal body 13 and extends below the dorsal body 13. The width is narrowed as the lower side approaches the crotch side. A portion having the same width as that of the back-side main body 13 can be omitted. If comprised in this way, the edge 14e of the width direction outer side of the buttock cover part 14C will come in the shape of a straight line or a curve which approaches the interior body 200 side as it approaches the crotch side, and it is easy to cover a buttock part. It becomes a shape.

  Although the dimension of the back side extension part 14 can be determined suitably, as shown in FIG. 6, the width direction length 14x of the collar part cover part 14C (the edge 14e on the width direction outer side of the collar part cover part 14C and the inner body 200) More preferably, the maximum distance in the width direction with respect to the side edge is 80 to 160 mm, and the length 14y (extension length) in the vertical direction of the collar cover portion 14C is 30 to 80 mm. Further, assuming that the area of a quadrangle determined by the widest part in the width direction and the widest part in the vertical direction is S, the area of the back side extension part 14 is 20 to 80% of S, In particular, it is preferable that the content is about 40 to 60% because the outer appearance and wearing feeling of the buttocks are excellent.

  The back body 13 can be conceptually divided into an upper end (waist part) W and a lower part U below the upper part in the vertical direction, and the range varies depending on the size of the product. The vertical length of the upper end W can be 15 to 80 mm, and the vertical length of the lower portion U can be 35 to 220 mm.

Between the inner side surface of the inner sheet-like material 12 and the outer side surface of the folded-back portion 12r of the outer sheet-like material at the upper end (waist portion) W of the back-side main body portion 13, a plurality of pieces are continuously provided in the entire width direction. The back waist elastic elastic members 17 are fixed in a state where they are stretched along the width direction at a predetermined stretch rate with an interval in the vertical direction. In addition, one or more of the back-side waist elastic elastic members 17 disposed in the region adjacent to the lower portion U of the back-side main body 13 may overlap with the interior body 200. Alternatively, the inner body 200 may be provided on both sides in the width direction except for the central portion in the width direction. The back 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. 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, an extension ratio 150% to 400%, preferably fixed in particular about 220-320%. Further, it is not necessary for all of the back side waist elastic elastic members 17 to have the same thickness and extension rate. For example, the elastic waist members may have different thicknesses and extension rates at the upper and lower portions of the back waist part. Good.

  Further, between the outer side surface of the inner sheet-like material 12 and the inner side surface of the outer sheet-like material 12 in the lower portion U of the back-side main body portion 13, except for the center portion in the width direction overlapping the interior body 200, A plurality of first elongate elastic elastic members 15 are vertically spaced along the width direction at a predetermined stretch rate so as to be continuous over the entire width direction at each of the upper and both sides in the width direction. It is fixed in the stretched state.

The first elongated elastic elastic member 15 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. the rubber thread ~1.0mm about ^2), 1 to 15 mm, particularly 5 to 30 present approximately at intervals of 3 to 8 mm, at an extension rate of 200 to 350%, preferably fixed in particular about 240-300%.

  In addition, between the outer side surface of the inner sheet-like material 12 and the inner side surface of the outer sheet-like material 12 in the back side extending portion 14, except for the center portion in the width direction that overlaps the interior body 200, The plurality of second elongated elastic elastic members 16 are spaced apart in the vertical direction so as to be continuous with each part over the entire width direction (at least over the entire buttock cover portion 14C), and at a predetermined expansion rate in the width direction. It is fixed in a stretched state.

The second elongated elastic elastic member 16 has a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1. It is preferable that about ² to 10 thread rubbers having an interval of 5 to 40 mm, particularly 5 to 20 mm, and an elongation ratio of 150 to 300%, particularly 180 to 260%, are fixed.

  On the other hand, the abdominal exterior sheet 12F is composed of only the abdominal body part basically the same as the back body part 13 of the back exterior sheet 12B (the part occupying the same vertical range as the side seal part by the welded part 12A group). It is a rectangular shape extending along the waistline direction, and does not have the back-side extending portion 14 like the back-side exterior sheet 12B.

  That is, among the upper end portion (waist portion) W and the lower portion U of the abdominal exterior sheet (abdominal body portion) 12F, the inner side surface of the inner sheet material 12 and the folded portion of the outer sheet material 12 at the upper end portion W. A plurality of ventral waist elastic elastic members 18 are spaced in the vertical direction so as to be continuous over the entire width direction between the outer surface of 12r and extend along the width direction at a predetermined expansion rate. It is fixed in the state. The ventral waist elastic elastic member 18 is preferably as close as possible to the back waist elastic elastic member 17 in terms of number, thickness, stretch rate, spacing, and vertical arrangement, but may be different. When differentiating, the difference in number is 10 or less, preferably 5 or less, the difference in thickness is 1880 dtex or less, preferably 470 dtex or less, the difference in elongation is 100% or less, preferably 40% or less, the difference in spacing Is 10 mm or less, preferably 5 mm or less.

  Further, a center in the width direction that overlaps the interior body 200 between the outer surface of the inner sheet-like material 12 and the inner side surface of the outer sheet-like material 12 in the lower portion U of the ventral-side exterior sheet 12F (abdominal-side main body). A plurality of third elongate elastic elastic members 19 are vertically spaced apart from each other on the upper side and both sides in the width direction except for the portion, and have a predetermined stretch rate. It is fixed in a stretched state along the width direction. Although the vertical disposition range of the third elongated elastic elastic member 19 may be a part of the lower portion, it is preferable that the third elongated elastic elastic member 19 is substantially the whole (a range in which the expansion / contraction force acts on the whole).

  The third elongated elastic elastic member 19 is preferably as close as possible to the first elongated elastic elastic member 15 in terms of number, thickness, stretch rate, spacing, and vertical arrangement, but may be different. When differentiating, the difference in number is 10 or less, preferably 5 or less, the difference in thickness is 1880 dtex or less, preferably 470 dtex or less, the difference in elongation is 100% or less, preferably 40% or less, the difference in spacing Is 10 mm or less, preferably 5 mm or less.

  The abdominal side exterior sheet 12F in the illustrated form is composed of only a portion that occupies the same vertical range as the welded portion 12A, but, similarly to the back side, a ventral body portion that occupies the same vertical range as the welded portion 12A and In addition, a configuration including an abdominal-side extension portion extending below the abdominal-side main body portion may be employed. Thereby, the leg periphery shape of the abdominal exterior sheet | seat 12F can be made into the shape fitted along a buttock. In this case, the area of the ventral extension part is preferably 10 to 80% of the area of the dorsal extension part, and more preferably 20 to 50%. If the ventral extension is excessively large, the fit is rather impaired, which is not preferable.

  On the other hand, as shown in the figure, the first, second and third elongated elastic elastic members 15, 16 and 19 are provided on both sides in the width direction except for the width direction central portion overlapping the interior body 200. However, it is preferable because the inner body 200 and the outer sheets 12F and 12B are difficult to peel off. In this form, in addition to the form in which elastic elastic members are present only on both sides in the width direction, one side in the width direction across the inner body 200 There is an elastic stretch member from one side to the other side, but the elastic stretch member is cut at the central portion in the width direction overlapping with the interior body 200, and the stretch force does not act (substantially no elastic stretch member is provided) (Equal) is also included. Also, a part of the first, second and third elongated elastic elastic members 15, 16 and 19, or the elastic force acts over the entire width direction of the back side main body part 13 and the back side extension part 14. The whole can be provided across the interior body 200 from one side in the width direction to the other side.

(Interior body)
The interior body 200 can take any shape, but is rectangular in the illustrated form. As shown in FIG. 3, the inner body 200 includes a surface sheet 30 on the body side, a liquid-impermeable sheet 11, and an absorbent element 50 interposed therebetween. On the back side of the liquid-impermeable sheet 11, a crotch portion is provided so as to cover the entire back surface of the interior body 200 or to cover the entire portion exposed between the abdominal exterior sheet 12 </ b> F and the back exterior sheet 12 </ b> B. The exterior sheet 12M can also be fixed. In addition, an intermediate sheet (second sheet) that quickly transfers the liquid that has permeated the surface sheet 30 to the absorbent element 50 can be provided between the surface sheet 30 and the absorbent element 50, but heat transfer to the skin is inhibited. Therefore, it is preferable that no other member is provided between the top sheet 30 and the absorbent element 50 at least at a portion that overlaps at least a portion having a superabsorbent polymer, which will be described later. Furthermore, in order to prevent excrement from leaking on both sides of the interior body 200, barrier cuffs 60 and 61 standing on the body side can be provided on both sides of the interior body 200. Although not shown, the constituent members of the interior body 200 can be appropriately fixed to each other by solid, bead or spiral application such as hot melt adhesive. The interior body 200 can also be detachably attached to the exterior sheets 12F and 12B using a mechanical fastener or an adhesive material.

(Surface sheet)
The surface sheet 30 has a property of transmitting liquid, and examples thereof include a porous or non-porous nonwoven fabric and a porous plastic sheet. 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, an SMS method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. In particular, non-woven fabrics processed by the spunbond method or SMS method are suitable in terms of excellent balance between thinness and strength in order to make it easy to detect temperature changes from the surface side, and non-woven fabrics processed by the air-through method are low. Even the basis weight is suitable because it absorbs quickly and has a smooth feeling.

  Further, the top sheet 30 may be composed of one sheet or may be composed of a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of a single sheet or a laminate of two or more sheets in the planar direction.

When constituting the surface sheet 30 of a nonwoven fabric, about the thickness of 0.1 to 3 mm, particularly 0.5mm or less, and a basis weight 10 to 40 g / m ² approximately, in particular configured such that 25 g / m ² or less, It is preferable because it has excellent heat conductivity from the back side to the skin.

  When the barrier cuffs 60 and 61 are provided, both side portions of the surface sheet 30 pass between the liquid-impermeable sheet 11 and the barrier cuffs 60 and 61 to the back side of the absorbent element 50 to prevent liquid penetration. Therefore, it is preferable to adhere to the liquid-impermeable sheet 11 and the barrier cuffs 60 and 61 with a hot melt adhesive or the like. Thereby, the effect that the rigidity of the both sides of the interior body 200 is improved is also obtained.

(Liquid impervious sheet)
The material of the liquid-impermeable sheet 11 is not particularly limited. For example, the liquid-impermeable sheet 11 is substantially made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet, or a waterproof film. Non-woven fabrics that ensure liquid impermeability (in this case, a liquid-impermeable sheet is composed of a waterproof film and a non-woven fabric). Of course, in addition to this, materials having liquid impermeability and moisture permeability, which have been used and used in recent years from the viewpoint of preventing stuffiness, can also be exemplified. As the sheet of the material having liquid impermeability and moisture permeability, for example, an inorganic filler is kneaded in an olefin resin such as polyethylene or polypropylene, and the sheet is formed, and then stretched in a uniaxial or biaxial direction. Examples of the microporous sheet obtained in this way can be given. In addition, non-woven fabric using micro-denier fiber, strengthening leak-proofing by reducing the voids of the fiber by applying heat or pressure, and applying water-absorbing resin or hydrophobic resin or water repellent. A sheet that is liquid-impermeable without using a film can also be used as the liquid-impermeable sheet 11.

  The liquid-impermeable sheet 11 is preferably extended around both sides of the absorbent element 50 to both sides of the side surface 30 of the absorbent element 50 in order to improve leakage prevention. Thereby, the effect that the rigidity of the both sides of the interior body 200 is improved is also obtained. The width of this extended portion is suitably about 5 to 20 mm on each of the left and right sides.

  Further, the inner surface or the outer surface of the liquid-impermeable sheet 11 may be designed by printing or coloring. Further, a printed or colored design sheet, which is a separate member from the crotch outer sheet 12M, may be attached to the outside of the liquid-impermeable sheet 11. Further, an excretion indicator 80 whose color changes due to absorption of the liquid component can be provided inside the liquid-impermeable sheet 11.

(Barrier cuffs)
The barrier cuffs 60 and 61 are belt-like members extending along the both sides of the interior body 200 over the entire front-rear direction, blocking urine and soft stool that travel along the top sheet 30 in the lateral direction and prevent side leakage. It is provided to prevent this.

  In the present embodiment, as shown in FIGS. 3 and 4, barrier cuffs 60 and 61 are provided twice on the left and right sides of the interior body 200. In the state where the diaper is unfolded, as shown in the figure, the inner barrier cuff 61 stands obliquely from the side of the interior body 200 toward the center in the width direction, and the outer barrier cuff 60 is in the width direction of the inner barrier cuff 61. The outer side portion is provided so as to stand upright from the side of the interior body 200, the base side portion stands obliquely toward the center in the width direction, and the tip side portion from the intermediate portion stands obliquely outward in the width direction. To do.

More specifically, the inner barrier cuff 61 folds the strip-shaped barrier 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. A plurality of elongated elastic elastic members 63 are fixed along the longitudinal direction with a gap in the width direction. The elongated elastic elastic member 63 is not fixed to the barrier sheet 62 at the front and rear ends, and is fixed so that the barrier cuff extends and contracts in the middle part. The barrier sheet 62 is made of a spunbond nonwoven fabric (SS, SSS, etc.), an SMS nonwoven fabric (SMS, SSMMS, etc.), a melt-blown nonwoven fabric with excellent uniformity and concealment, and water-repellent with 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 420 to 1120 dtex, and more preferably 620 to 940 dtex. The elongation rate at the time of fixation is preferably 150 to 350%, more preferably 200 to 300%. Although not shown, a waterproof film can be interposed between the barrier sheets folded in two.

  It is preferable to arrange one or two elongated elastic expansion / contraction members 63 at the distal end portion of the inner barrier cuff 61, and it is even more preferable that one or two elongated elastic expansion / contraction members 63 be disposed at an intermediate portion between the distal end portion and the proximal end portion. When the elongated elastic elastic member 63 is present in the intermediate part, it becomes easy to hit the skin with the surface in the range from the intermediate part to the tip part using this as a fulcrum. The arrangement position of the elongated elastic elastic member 63 in the middle portion is preferably in the range of 30 to 70% of the height of the inner barrier cuff 61 (length in the width direction of the protruding portion). In an infant paper diaper, the height of the inner barrier cuff 61 is preferably about 15 to 35 mm. Therefore, the arrangement range of the elongated elastic stretch member 63 is preferably 5 to 25 mm from the distal end to the proximal end, and is 12 to 18 mm. Is more preferable. When the elongated elastic elastic members 63 are provided in parallel at the front end portion and / or the intermediate portion of the inner barrier cuff 61, the arrangement interval 61d is preferably 2 to 10 mm, and more preferably 2 to 6 mm.

  The end of the inner barrier cuff 61 opposite to the folded portion in the width direction is an attachment portion (inner attachment portion) 65 fixed to the back surface of the side edge of the interior body 200. The portion is a protruding portion 66 (a portion on the folded portion side and corresponding to the inner protruding portion) protruding from the mounting portion 65, and both ends in the front-rear direction of the protruding portion 66 are hot melt adhesive on the surface of the surface sheet 30. And a front-rear fixing portion 67 by heat sealing, and a middle portion in the front-rear direction is an unfixed free portion (inner free portion), and an elongated elastic member 63 along the front-rear direction is fixed to the free portion in an extended state. Yes.

  The outer barrier cuff 60 also has basically the same structure as the inner barrier cuff 61, but its attachment portion (outer attachment portion) 68 is an attachment portion 65 of the inner barrier cuff 61 on the back side of the interior body 200. Further, both ends in the front-rear direction of the projecting portion (outer projecting portion) 69 pass from the mounting portion 68 to the side of the interior body 200, and are fixed to the outer surface of the inner barrier cuff 61 on the center side in the width direction. 61, a base side portion that extends to the surfaces of both end portions in the front-rear direction of the inner projecting portion 66 and is fixed to the surfaces of both end portions in the front-rear direction of the inner projecting portion 66, and is folded back outward in the width direction from the tip of the base side portion. In addition, the point differs from the front end side portion fixed to the base side portion, the arrangement and number of the elongated elastic elastic members 63, and the like.

  However, the inner barrier cuff 61 also has a structure in which the tip of the inner protruding portion is folded outward in the width direction, specifically, not more than 1/2 of the height of the inner barrier cuff 61 (width direction length of the protruding portion), If it is preferably 1/3 or less, a structure in which the tip side portion is folded back in the width direction and fixed to the base portion side portion similarly to the outer barrier cuff 61 may be adopted.

  The number of the elongated elastic elastic members 63 provided in the free part (outer free part) of the outer barrier cuff 60 is preferably 2-6, and more preferably 3-5. 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 elongated elastic elastic member 63 disposed on the outer barrier cuff 60 has the same thickness and elongation rate as the inner barrier cuff 61, but the thickness is the same as or larger than that of the inner barrier cuff 61, and the elongation rate is the inner barrier cuff. The same or lower than that of 61 is preferred.

  Further, the front-rear direction length L6 of the front-rear fixing portion 67 of the protruding portions 66, 69 is preferably formed so that the inner barrier cuff 61 is the same as or shorter than the outer barrier cuff 60, and is elongated in the barrier cuffs 60, 61. The length of the elastic stretch member 63 in the front-rear direction is preferably formed so that the inner barrier cuff 61 is the same as or longer than the outer barrier cuff 60. The boundary between the attachment portion 65 and the protruding portion 66 may be the same position on the outer barrier cuff 60 and the inner barrier cuff 61, but the boundary of the outer barrier cuff 60 is the center in the width direction than the boundary of the inner barrier cuff 61. It is preferable to be spaced apart to the side, and the distance is preferably within 10 mm.

  It is preferable to form a linear root fixing part by hot melt adhesive or heat sealing at the edge part on the protruding parts 66, 69 side of the attaching parts 68, 65 of the outer barrier cuff 60 and the inner barrier cuff 61. The other fixing portions can be fixed in an appropriate pattern using a hot melt adhesive or the like. The linear root fixing portion is located in the vicinity of the side portion on the front surface side of the interior body 200 (specifically, the position from 0 to 5 mm in the width direction from the side edge, preferably 0 to 3 mm) or the back surface side. preferable. In this case, since the barrier cuff is folded and fixed to the surface side substantially only at both ends in the front-rear direction, in the crotch part where the restriction to the center in the width direction by the front-rear fixing part 67 does not sufficiently act. The outer barrier cuff 60 and the inner barrier cuff 61 both stand up outward in the width direction, and the pocket formed by the inner barrier cuff 61 becomes wider. When the linear root fixing part is positioned over 5 mm from the side edge in the width direction on the surface side, the barrier cuff rises toward the center in the width direction also in the crotch part, and the pocket formed by the inner barrier cuff 61 is narrow Therefore, it is not preferable. When located on the back side, a position of 0 to 20 mm from the side edge of the interior body 200 is appropriate, but may be located beyond 20 mm.

  The fixing target of the attachment portions 68 and 65 of the outer and inner barrier cuffs 60 and 61 can be an appropriate member such as the surface sheet 30, the liquid-impermeable sheet 11, and the absorbent element 50 in the interior body 200. The other barrier cuff can be fixed to the interior body 200 via the one barrier cuff.

  In the outer and inner barrier cuffs 60 and 61 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 both ends in the front-rear direction among the protruding parts 66 and 69 do not stand up. However, only the free part stands up against the body as shown in FIG. 3. In particular, when the attachment portions 68 and 65 are located on the back side of the interior body 200, the outer and inner barrier cuffs 60 and 61 stand up so as to open outward in the width direction at the crotch portion and the vicinity thereof. The barrier cuffs 60, 61 come into contact with the legs around the surface, so that the fit is improved. On the other hand, on both the front and rear sides (abdomen and back) of the crotch part, the inner and rear barrier cuffs 61 are restricted by the front and rear fixing part 67 so that the outer and inner barrier cuffs 60 and 61 do not open outward in the width direction. In addition, since the lower half of the outer barrier cuff 60 is also erected in the same manner, it is possible to surely prevent the abdomen and the back from leaking from both sides of the interior body 200. Further, the front and rear fixing portions 67 of the protruding portion 66 of the inner barrier cuff 61 are not folded back, and the front and rear fixing portions 67 of the protruding portion 68 of the outer barrier cuff 60 are folded outward. , 61 is maintained between the inner and outer free parts, and the outer and inner barrier cuffs 60, 61 are securely raised at a wide interval, and each fits around the leg, providing excellent leakage prevention. It will be.

Although the dimensions of the barrier cuffs 60 and 61 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 inner barrier cuff 61 (the length in the width direction of the protruding portion 66 in the unfolded state). ) W5 is 10 to 50 mm, preferably 15 to 35 mm. Standing height of the outer barrier cuff 60 (width direction length of the protruding portion 69 in the unfolded state) W6 is 15 to 60 mm, particularly 20 to 40 mm. Is preferred. Further, the separation distance W4 between the tips in the state where the inner barrier cuff 61 is tilted to the surface of the top sheet 30 is preferably 60 to 170 mm, particularly 70 to 120 mm. In addition, when the outer barrier cuff 60 is flatly folded so that the outer barrier cuff 60 is parallel to the surface of the top sheet 30, the separation distance W3 between the innermost folds is preferably 60 to 190 mm, particularly preferably 70 to 140 mm.
Unlike the illustrated embodiment, only one of the outer and inner barrier cuffs 60 and 61 can be provided.

(Absorption element)
Although the absorbent element 50 of this example has the absorber 56 and the covering sheet 58 which wraps the whole absorber 56, the covering sheet 58 can also be abbreviate | 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.

The absorber 56 may be rectangular, but as shown in FIG. 6, the front end portion 56F, the rear end portion 56B, and a constricted portion having a narrower width than those of the front end portion 56F and the rear end portion 56B. It is preferable to form an hourglass shape having 56N because the fit of the absorber 56 itself and the barrier cuffs 60, 61 around the legs is improved. As specific dimensions, the length in the front-rear direction of the absorber front end portion 56F is L1, the length in the front-rear direction at the overlapping portion between the absorber 56 and the ventral exterior sheet 12F is L2, and the length of the absorber rear end portion 56B is The length in the direction is L3, the length in the front-rear direction at the overlapping portion of the absorber 56 and the backside exterior sheet 12B is L4, the minimum width of the constricted portion 56N is W1, the width of the absorber front end portion 56F and the rear of the absorber When the width of the end portion 56B is W2, it is preferable that the end portion 56B is configured to satisfy the following expressions (1) to (4).
70 mm ≦ W1 <W2 ≦ 190 mm (1)
0.5 ≦ W1 / W2 ≦ 0.85 (2)
0 mm ≦ L1-L2 ≦ 70 mm (3)
0mm ≦ L3-L4 ≦ 50mm (4)

If W1 and W2 are too narrow, the standing of the barrier cuffs 60 and 61 becomes unstable, and the amount of absorption becomes insufficient. If it is too wide, the fit feeling deteriorates due to a decrease in fit.
In addition, when the value is within the above numerical range, the absorber 56 does not exist in the vicinity of the attachment portion 65 of the barrier cuffs 60, 61 in the crotch portion. Therefore, the degree of freedom of movement of the barrier cuffs 60, 61 increases, and the barrier cuffs 60, 61 Is easy to open outward in the width direction, and easily touches the skin with the surface, and the followability of the fit surface to the movement of the leg is improved. Since the absorber 56 on the side of the interior body 200 exists in a sufficient range on both the front and rear sides, the standing of the barrier cuffs 60 and 61 is stabilized with this as a base point (fulcrum). A portion extending from the front and rear sides to the crotch portion is a displacement portion in which the barrier cuffs 60 and 61 are opened outward in the width direction from a posture in which the barrier cuffs 60 and 61 are erected on the inner side in the width direction with reference to both side edges in the width direction. The posture change of 60, 61 is supported by the absorber 56 that exists up to the side of the interior body 200, and the overall standing shape of the barrier cuffs 60, 61 is stabilized. If the constricted part is too large outside the above numerical range, the degree of freedom of the barrier cuffs 60 and 61 becomes too high in the crotch part, and there is a possibility that a gap is easily formed around the leg, and both the front and rear sides of the crotch part However, since there is no base point (fulcrum), the standing of the barrier cuffs 60 and 61 may become unstable. Conversely, if the constricted portion becomes too small, the degree of freedom of the barrier cuffs 60 and 61 is lowered, which is not preferable.

  Furthermore, the front-rear direction length L7 of the entire constricted portion 56N is preferably 80 mm or more, and particularly preferably 120 to 260 mm. If the length L7 in the front-rear direction of the constricted portion 56N is too short, the degree of freedom of the barrier cuffs 60 and 61 is lowered, and the fit of the absorbent body 56 around the legs is lowered to prevent the movement of the legs, which is too long. And the standing of the barrier cuffs 60 and 61 becomes unstable.

(Superabsorbent polymer particles)
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, one integrated with an antibacterial substance can be used. In particular, zeolite particles obtained by substituting some or all of the ion-exchangeable ions in the zeolite with silver ions (hereinafter referred to as antibacterial deodorant zeolite) are contained in the superabsorbent polymer or antibacterial. Antibacterial deodorant superabsorbent polymer particles obtained by adhering deodorant zeolite particles to the surface of superabsorbent polymer particles by static electricity are suitable.

  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.

Basis weight of the superabsorbent polymer particles may be a 50 to 800 g / m ^2, in particular 100~40g / m ² is preferred. If the amount of polymer is less than 50 g / m ^2, it is difficult to secure the absorption amount. If it exceeds 800 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.

(Enveloping sheet)
When the covering 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 sheet is a fine sheet from which the superabsorbent polymer particles do not come out, and a thin sheet having a low weight is appropriate for facilitating the sensing of temperature changes from the surface side. Thickness of about 0.05 to 3 mm, particularly 0.2mm or less, and a basis weight 5 to 25 g / m ² approximately, in particular is 15 g / m ² or less, for excellent heat transfer from the backside to the skin. In the case of using a nonwoven fabric, a nonwoven fabric processed by the spunbond method or the SMS method, particularly a nonwoven fabric processed by the SMS method is preferable in terms of excellent balance between thinness and strength, and the material is polypropylene, polyethylene / polypropylene, etc. Can be used.

(Crotch exterior sheet)
A crotch outer sheet 12M exposed on the outer surface of the product is provided on the back surface side of the inner body 200. As the material of the crotch outer sheet 12M, the same material as the abdominal outer sheet 12F and the back outer sheet 12B can be used, but a material containing a higher-strength material or a deodorant, etc. A material different from the exterior sheet 12F and the back-side exterior sheet 12B may be used. Specifically, various nonwoven fabrics such as spunbond nonwoven fabric, melt blown nonwoven fabric, point bond nonwoven fabric, air-through nonwoven fabric, air point nonwoven fabric, spunlace nonwoven fabric, SMS nonwoven fabric, and the like made of fibers of PP, PP / PE, PP / PET, or the like, or What added the deodorizer etc. to this can be used.

  A high body pressure is applied to the crotch outer sheet 12M when sitting. Therefore, a material having a high friction fastness (not fuzzy) is preferable.

  The crotch outer sheet 12M may be a sheet provided with design elements by printing or coloring. When used in combination with the above-described design sheet, it is preferable to dispose the designs so that they do not overlap.

  It is preferable to use a stretchable nonwoven fabric as the crotch outer sheet 12M and to extend and paste in the longitudinal direction of the inner body 200 because the fit of the crotch part is improved.

  When the crotch outer sheet 12M goes from the side in the width direction to the side of the body and is bonded and fixed to the outer surface of the barrier sheet 62 with a hot melt adhesive or the like, the rigidity of both sides of the inner body 200 is improved. In such a form, it is preferable to use a sheet having high rigidity (roughness) as the crotch outer sheet 12M. Specifically, a sheet having a bending resistance measured by the Clark method (JISL1096 C method) and a sum of the MD direction and the CD direction of the sheet of 100 mm or more, preferably 150 mm or more may be used.

  In the illustrated example, the crotch outer sheet 12M is sandwiched between the inner body 200 and the abdominal and dorsal exterior sheets 12F and 12B where the ventral and dorsal exterior sheets 12F and 12B overlap the interior body 200. However, it is also possible to affix them to the outside of the ventral and backside exterior sheets 12F and 12B. The crotch outer sheet 12M is affixed to the back surface of the inner body 200 and the inner or outer surfaces of the abdominal and back-side outer sheets 12F and 12B with a hot melt adhesive or the like.

<About features>
The present invention is based on the idea that in a region close to the skin, urine is cooled or heated by the temperature change substance 40 and then absorbed and held by the superabsorbent polymer. One preferred form thereof is, for example, FIG. As shown in FIG. 4, a temperature-changing substance that cools or heats urine by contact with urine is provided on the surface of the absorbent body 56 that includes at least the superabsorbent polymer in the covering sheet 58 of the absorbent element 50. An arrangement form is proposed.

  The temperature change substance 40 is in contact with urine and absorbs or releases heat by heat of dissolution, heat of hydration, heat of reaction, etc., and cools or heats urine. Examples of the temperature change substance 40 that absorbs heat by dissolution in urine include hydrated salts such as sodium acetate, sodium carbonate, sodium sulfate, sodium thiosulfate, and sodium phosphate, ammonium nitrate, potassium nitrate, ammonium chloride, potassium chloride, nitric acid Examples thereof include anhydrous salts such as sodium, sugar alcohols such as urea, xylitol and sorbitol. Examples of the temperature change substance 40 that releases heat when dissolved in urine include aluminum chloride, aluminum sulfide, aluminum potassium sulfide, and the like. In the present invention, among these, it is preferable to use sugar alcohols such as sorbitol and xylitol that exhibit an endothermic effect, or organic compounds such as urea. In particular, sorbitol and xylitol can be suitably used because they are extremely excellent in solubility, have good chemical stability, and do not adversely affect the human body. When using a substance that absorbs heat or dissipates heat by dissolving in urine, if the solubility in urine is low, sufficient temperature change cannot be exhibited, so the solubility in 100 ml of water at a temperature of 20 ° C. is 30 g or more, particularly 50 g or more. Those are preferred. Moreover, what produces the temperature change of 20 cal / g or more is preferable, and what produces the temperature change of 35 cal / g or more is more preferable.

  Examples of substances that absorb or release heat by reaction with urine include orthoesters, or Menton ketal obtained by reacting menthone with alcohols having 1 to 8 carbon atoms or polyols having 2 to 8 carbon atoms. Ketals and their structural or optical isomers. Examples of the temperature change substance 40 that absorbs or releases heat by swelling with urine include polyacrylic acid that is lightly cross-linked and partially neutralized.

  The temperature change substance 40 is preferably in the form of particles (including powder), but other shapes such as fibers can also be used. Further, as the superabsorbent polymer that absorbs and holds urine that has been cooled or heated, the same polymers as those contained in the absorber 56 described above can be used, and those having a water absorption speed of 50 seconds or less are particularly suitable. It is. If the water absorption rate is slow, most of the cooled or heated urine passes through the back side without being absorbed.

  As shown in FIG. 3, the form in which the temperature-changing substance that cools or heats urine by contact with urine is arranged on the surface of the absorber 56 is, for example, that superabsorbent polymer particles are disposed substantially over the entire thickness direction. After forming the absorber 56 to contain, it can manufacture by spraying or projecting the particulate temperature-change substance 40 on the surface. In particular, by projecting the particulate temperature change material 40, a part of the temperature change material 40 enters the absorber 56, and the surface side layer of the absorber 56 mixes the temperature change material 40 and the superabsorbent polymer. A layer containing only the temperature change substance 40 is formed on this layer. When formed in this way, the thickness of the particle layer on the absorber 56 is reduced, and this is preferable because the wearer is less likely to feel a crisp and uncomfortable feeling. On the other hand, in order to more strongly sense the temperature change immediately after urination, substantially all the temperature change substance 40 can be disposed on the upper side of the absorber 56 without forming the mixed layer.

  In other words, this form is used for absorbing and holding cooled or heated urine from the superabsorbent polymer particles normally contained in the absorber 56, which are contained in the surface side layer of the absorber 56. To do. Therefore, in this embodiment, when the density of the superabsorbent polymer is higher on the front side than on the back side of the absorbent body 56, more urine cooled or heated can be held on the front side of the absorbent body 56, and the article surface This is preferable because the temperature change at can be further increased. Furthermore, the density of the superabsorbent polymer gradually increases toward the surface of the absorber 56, or the density of the superabsorbent polymer increases stepwise toward the surface of the absorber 56. It is more preferable that it is formed to have a gradient because the effect of increasing the temperature change of the article surface becomes significant. Such a density gradient can be formed by using a superabsorbent polymer having a particle size distribution with a large large particle size that hardly penetrates into the absorber 56.

  When configured in this way, urine that has permeated through the top sheet 30 and reached the surface of the absorber 56 is cooled or heated by the temperature change substance 40, then moves to the back side thereof and is absorbed by the superabsorbent polymer. Then, the temperature of the surface side layer of the absorbent body 56 containing the superabsorbent polymer is effectively transmitted to the article surface side, and the wearer perceives the temperature change. In particular, if the temperature change substance 40 is dissolved, the temperature change substance 40 dissolves during urination, so that the surface of the absorber 56 is exposed, and the temperature of the superabsorbent polymer that absorbs and holds the cooled or heated urine. Is preferably transmitted directly to the article surface side.

  Another preferred form is a form having a mixed layer 41 of a temperature change substance and a superabsorbent polymer on the surface of the absorber 56 as shown in FIG. Such a form can be manufactured by, for example, spraying or projecting a mixture of particulate temperature change material and superabsorbent polymer particles on the surface of the absorber 56. In particular, by projecting the temperature change material 40, some of the temperature change material and the superabsorbent polymer particles can enter the absorber 56. If it does so, the surface side layer of the absorber 56 will also be a layer which contains a temperature change substance and a superabsorbent polymer in a mixed state. When formed in this way, the thickness of the particle layer on the absorber 56 is reduced, and this is preferable because the wearer is less likely to feel a crisp and uncomfortable feeling. Moreover, as the absorber 56 in this embodiment, any of those that contain the superabsorbent polymer particles in the interior in advance and those that do not contain it can be used. When the absorbent body 56 does not include the superabsorbent polymer particles in advance, the superabsorbent polymer can be blended in the absorbent body 56 by the step of projecting the particulate temperature change material 40 and the superabsorbent polymer particles. The manufacturing process is not complicated. Of course, substantially all of the temperature change material 40 and the superabsorbent polymer can be disposed on the upper side of the absorbent body 56.

  In this form, the urine that has passed through the top sheet 30 and is supplied to the mixed layer 41 is cooled or heated by the temperature change substance, and then quickly absorbed by the highly absorbent polymer without transferring heat to other members. Therefore, the temperature change on the surface of the article is further increased.

  Moreover, when spraying or projecting the particulate temperature change substance 40 and the superabsorbent polymer particles on the surface of the absorber 56, spray or project each of the mixture separately, rather than spraying or projecting the mixture all at once. Thus, both may be in a substantially laminated state (including a state in which a layer partially mixed in the middle in the thickness direction is included). In particular, it is preferable to spray or project the superabsorbent polymer particles first because the temperature change substance 40 is disposed above the superabsorbent polymer. In this case, it is possible to use spraying and projection properly according to the purpose, such as projecting the superabsorbent polymer particles in the first order and spraying the subsequent particulate temperature change substance 40.

  In this specification, letting a particulate matter fall freely is called “dispersion”, and giving an initial velocity and spreading more vigorously than free fall is called “projection”. When spraying or projecting in multiple times, any particulate matter is "projected" and the initial velocity given during the projection is changed, so that the degree of loading of the absorbent body 56 on the fiber assembly or after the spraying It is also possible to control the degree of mixing of a plurality of types of particulate matter. For example, when the particulate temperature change substance 40 and the superabsorbent polymer particles are separately sprayed or projected as in the above example, the superabsorbent polymer particles are projected first and more than the temperature change substance of the particulate change. By projecting at a high initial velocity, most of the superabsorbent polymer particles penetrate into the absorber 56, and a thick layer is formed on the side of the absorbent element 50 where the particulate temperature change material 40 is closest to the surface. Can be formed.

  A technique for spraying or projecting particles during the production of an absorbent element has been conventionally known, and this technique can also be applied to the projection of the temperature-changing substance 40 and superabsorbent polymer particles in the present invention. For example, by providing a layer of superabsorbent polymer particles between the upper surface of the absorbent body 56 and the covering sheet 58, the smoothness of the diaper surface is improved by taking advantage of the low liquid return of the superabsorbent polymer particles. The technology is known, and when manufacturing such an absorbent element 50, after directly dispersing the particles on the covering sheet 58 conveyed in an inverted state, the absorbent body 56 is placed upside down on it. However, when particles are directly dispersed on the covering sheet 58 in a high-speed production line, scattering of the particles becomes a problem. This is a problem that is difficult to solve even if an adhesive is interposed. On the other hand, in the manufacturing process, the absorbent body 56 is placed on one wide covering sheet 58, and the superabsorbent polymer particles are dispersed from the absorbent body 56, whereby a fiber aggregate (and a part of the absorbent body 56) is dispersed. Are loaded in the fiber assembly), and then the covering sheet 58 extending from the lower side of the absorbent body 56 to both sides is wound up to wrap the absorbent body 56, and the particulate matter is scattered on the production line. Adopting the method of forming the absorbent element 50 without doing so can solve the problem of particle scattering. However, in this case, a seam of the covering sheet 58 is formed on the upper side of the absorbent element 50, and the small particles of the superabsorbent polymer before absorption may escape from the seam, and the surface sheet 30 is further washed. If a sheet with a coarse mesh is used to obtain a feeling, the superabsorbent polymer particles escape from the surface sheet with a coarse mesh, and the superabsorbent polymer particles are exposed to the wearer side of the diaper before or during use. Sometimes. When such a situation occurs, the exposed superabsorbent polymer particles swell after absorbing fluid and become jelly-like particles with a size that is easily noticeable, causing discomfort and unnecessary anxiety to wearers and those who change diapers. It gives a feeling. Usually, in order to prevent escape of the superabsorbent polymer particles, a thin layer made of fiber aggregates is provided above the particulate layer, but the fiber aggregate layer returns more liquid than the superabsorbent polymer. It is not preferable for improving the feeling of lightness.

  However, when spraying or projecting the particulate temperature change material 40 and the superabsorbent polymer particles on the surface of the absorber 56, particularly when projecting, the absorber is placed on one wide covering sheet 58 in the manufacturing process. 56, and the particles are dispersed or projected so that the layer of the temperature-change substance 40 is formed above the layer of the superabsorbent polymer particles. The particulate matter is supported on the fiber assembly 56 (and a part thereof in the fiber assembly), and then the covering sheet 58 extending from the lower side of the absorbent body 56 to both sides is rolled up to form the absorbent body 56. When the absorbent element 50 is formed by wrapping, the layer of the temperature change substance 40 covers the superabsorbent polymer particles, so that escape of the superabsorbent polymer particles can be prevented. In this case, there is a possibility that the particulate temperature change substance 40 escapes and is exposed to the wearer side of the diaper. However, if a temperature change substance 40 is used as the temperature change substance 40, the temperature change substance 40 is used at the time of use. Since it dissolves and disappears, it is difficult to cause the above problems.

  Further, not only when the particulate temperature changing substance 40 and the superabsorbent polymer particles are scattered or projected on the surface of the absorber 56, but also the particulate temperature changing substance on the surface of the absorber 56 containing the superabsorbent polymer particles. In the case of spraying or projecting 40, even when the density of the superabsorbent polymer on the upper side of the absorbent body 56 is increased, it is not necessary to provide a thin layer made of a fiber aggregate or the like on the upper side, so that a high smoothness is felt. It is possible to obtain the same effect as described above that prevents the escape of the superabsorbent polymer particles while obtaining the above.

  The seam of the covering sheet 58 on the surface (wearer surface) side of the absorbent element 50 described above allows the wearer to sense temperature change effectively. It is preferable that the width of the arrangement region is narrower than 40 W and the size is 40 mm or less, particularly 20 mm or less. Even if it is made narrow like this, the superabsorbent polymer particles will not escape for the above reasons. It is also a preferred form that the seam of the covering sheet 58 is formed closer to the side so as not to include the center in the width direction in contact with the urination port.

  As another form, as shown in FIG. 11, a temperature change sheet 42 in which a particulate temperature change substance is held in a liquid-permeable fiber assembly sheet such as paper or nonwoven fabric is attached to the surface of the absorbent body 56. It is also proposed. In this case, as shown in the figure, the temperature change sheet 42 includes a particulate temperature change substance 40 and a high temperature material between the fiber aggregate layers 42a and 42b made of heat-bonded fibers, pulp, or the like. The absorbent polymer particles 43 are laminated (in the illustrated form, the upper layer is the temperature-changing substance 40 and the lower layer is the superabsorbent polymer particles 43, or vice versa) or not shown, but they are sandwiched in a mixed state and heated to be integrated. An airlaid nonwoven fabric sheet is suitable.

Here, in order for the wearer to clearly perceive urination, it is preferable that there is a temperature change of 4 degrees or more, particularly 5 degrees or more on the surface of the top sheet 30. Specifically, such a temperature change is achieved in a structure having the temperature change material 40 and the superabsorbent polymer in the upper layer of the absorbent element 50 and having no other member between the topsheet 30 and the absorbent element 50. In order to do so, it is preferable that the following conditions are satisfied.
Material of liquid-permeable surface sheet 30: non-woven fabric Thickness of liquid-permeable surface sheet 30: 0.1 to 0.5 mm
The weight of the liquid-permeable surface sheet 30 is 10 to 40 g / m ²
Material of the covering sheet 58: Crepe paper or SMS nonwoven fabric Thickness of the covering sheet 58: 0.05 to 0.2 mm
Weight of covering sheet 58: 5 to 25 g / m ²
Type of temperature change substance: A substance that causes an endothermic reaction when dissolved in urine and cools urine.
Solubility of temperature change substance (for 100 ml of water at a temperature of 20 ° C.): 30 g or more, especially 50 g or more Weight of temperature change substance: 300 to 800 g / m ²
Area of the portion having the temperature change substance: 2,500 to 20,000 mm ²
The total amount of heat change that can occur in the temperature change sheet 42 due to the temperature change material: 50 cal or more, particularly 150 cal or more The heat change that can occur per unit area of the portion having the temperature change material: 1 cal / cm ² or more, especially 2.5 cal / cm ² or more Absorption rate of superabsorbent polymer that absorbs urine whose temperature has changed: 50 seconds or less, particularly 40 seconds or less The basis weight of superabsorbent polymer that absorbs urine whose temperature has changed is 50 to 400 g / m ^2.
Area of the portion having a superabsorbent polymer that absorbs urine whose temperature has changed: 2,500 to 20,000 mm ²

Although the said form is a form which has the temperature change substance 40 and the superabsorbent polymer in the absorption element 50, as shown in FIG. 12, between the surface sheet 30 and the absorption element 50, it is different from this. Temperature change layer such as a temperature change sheet 42 including a temperature change substance 40 and a superabsorbent polymer 43 that absorbs and holds urine cooled or heated by the temperature change substance 40 (not limited to a sheet shape, other forms of members, or A form provided with a particle layer containing temperature change substance particles and superabsorbent polymer particles in a mixed state or a laminated state is also proposed. Since the temperature change sheet 42 in this case is the same as that described above, the same reference numerals are used and description thereof is omitted. In this embodiment, when no other member is provided between the top sheet 30 and the temperature change sheet 42, it is preferable that the following condition is satisfied in order to achieve the temperature change described above.
Material of liquid-permeable surface sheet 30: non-woven fabric Thickness of liquid-permeable surface sheet 30: 0.1 to 0.5 mm
The weight of the liquid-permeable surface sheet 30 is 10 to 40 g / m ²
Material of the covering sheet 58: Crepe paper or SMS nonwoven fabric Thickness of the covering sheet 58: 0.05 to 0.2 mm
Weight of covering sheet 58: 5 to 25 g / m ²
Type of temperature change substance: A substance that causes an endothermic reaction when dissolved in urine and cools urine.
Solubility of temperature change substance (for 100 ml of water at a temperature of 20 ° C.): 30 g or more, particularly 40 g or more Weight of temperature change substance: 300 to 800 g / m ²
Area of the portion having the temperature change substance: 2,500 to 20,000 mm ²
The total amount of heat changes that can occur to the temperature change sheet 42 by the temperature changing substance: 50 cal or more, in particular thermal behavior can occur per unit area of the part having the temperature changing substance or 150cal: 1cal / cm ² or more, especially 2.5cal / cm ² or more Absorption rate of superabsorbent polymer that absorbs urine whose temperature has changed: 50 seconds or less, particularly 40 sec or less The weight of superabsorbent polymer that absorbs urine whose temperature has changed is 50 to 400 g / m ^2.
Area of the portion having a superabsorbent polymer that absorbs urine whose temperature has changed: 2,500 to 20,000 mm ²

  On the other hand, in each of the above embodiments, the portion having the temperature change material 40 (the portion having the mixed layer in the case of providing the mixed layer of the temperature change material 40 and the superabsorbent polymer, the temperature change sheet 42 in the case of the temperature change sheet 42). The position of the portion having the temperature change substance 40) can be determined as appropriate, but in the front-rear direction, from the position of 0-160 mm on the front side to the position of 0-80 mm on the rear side with respect to the center in the front-rear direction (groin) CL It is preferable that the length 40L in the front-rear direction is preferably 30 to 250 mm. In the width direction, the width direction is symmetrical with respect to the center in the width direction (groin), and the width 40W is 30 to 140 mm. Is preferably provided.

  Further, when a portion having the superabsorbent polymer protrudes on either or both of the front and rear sides and the width direction both sides of the portion having the temperature change material 40, the portion having the temperature change material 40 is cooled or heated. The portion of the urine that has diffused around the portion having the temperature change substance 40 can be effectively absorbed and retained by the superabsorbent polymer, and a large temperature change can be brought to a wider range of the article surface. preferable. For example, in a form in which superabsorbent polymer particles are included in the entire absorber 56, the peripheral portion of the absorber 56 is used as a protruding portion, and the above-described structure can be obtained by arranging a temperature change substance on the inside. . The protruding portion having the superabsorbent polymer preferably has a protruding width 40x of 15 mm or more.

  As a sample, the structure shown in FIG. 3 (hereinafter also referred to as “structure A”), the structure shown in FIG. 12 (also referred to as “structure B”), and a commercial product containing a temperature change substance (“HUGGIES Pull-Ups TRAINING PANTS Cool” manufactured by Kimberly Clark) “Alert (2T-3T size)”. This is a structure similar to the structure obtained by removing the superabsorbent polymer from the temperature change sheet 42 in the structure B), and the pants of the reference product (the form excluding the temperature change sheet 42 in the structure B). A disposable disposable diaper was prepared. For Structure A, Samples 1 to 5 having different basis weights of temperature change materials were prepared. The main specifications of each sample were as follows.

(Main specifications of sample of structure A)
Liquid-permeable surface sheet 30: an air-through nonwoven fabric composed of PE / PP composite fibers having a thickness of 2 mm and a basis weight of 25 g / m ² .
Covering sheet 58: Crepe paper having a thickness of 1 mm and a basis weight of 15 g / m ² .
Dimensions of absorber 56: From a position of 205 mm on the front side to the position of 190 mm on the rear side with respect to the center in the front-rear direction, and from a position of 70 mm on the left side to a position of 70 mm on the right side with respect to the center in the width direction. The area is 55,300 mm ² .
Type of temperature change substance 40: Sorbitol (The heat of dissolution is minus 26 cal / g, “Sorbit” manufactured by Towa Kasei Kogyo Co., Ltd.)
Solubility of temperature changing substance 40 (for 100 ml of water at a temperature of 20 ° C.): 70 g.
Dimensions of the portion having the temperature change substance 40: from the position of 160 mm on the front side to the position of 40 mm on the rear side with respect to the center in the front-rear direction and from the position of 50 mm on the left side to the position of 50 mm on the right side with respect to the center in the width direction Rectangular range of. The area is 20,000 mm ² .
Total amount of heat change that can be caused in the absorber by the temperature change substance 40: 208 cal (in the case of sorbitol 400 gsm).
Change in heat per unit area of the portion having the temperature change substance 40: 1.04 cal / cm ² (in the case of sorbitol 400 gsm).
Absorption rate of superabsorbent polymer: 35 seconds.
Superabsorbent polymer basis weight: 150 g / m ² (dispersed uniformly in the thickness direction of the absorber 56).
Dimensions of the portion having the superabsorbent polymer: (the entire absorber 56).

(Main specifications of sample of structure B)
The upper layer 42a of the temperature change sheet 42: pulp (weighing 40 g / m ² ) and 1.7 dtex PE / PET bicomponent fiber (weighing 10 g / m ² ).
The lower layer 42a of the temperature change sheet 42: pulp (weighing 40 g / m ² ) and 1.7 dtex PE / PET bicomponent fiber (weighing 10 g / m ² ).
Upper middle layer 42c of temperature change sheet 42: temperature change substance 40 (weight per unit area: 400 g / m ² ).
Middle layer 42d of the temperature change sheet 42: superabsorbent polymer 43 (100 g / m ² basis weight).
The size of the temperature change sheet 42: the same as the portion having the temperature change material in the structure A.
Dimension of a portion having the temperature change material 40 in the temperature change sheet 42: the entire temperature change sheet 42.
Dimension of a portion having the superabsorbent polymer 43 in the temperature change sheet 42: the entire temperature change sheet 42.
Liquid permeable top sheet 30: common with structure A.
Cover sheet 58: common to structure A.
Dimensions of absorber 56: common to structure A.
Type of temperature change substance 40: common to structure A.
Solubility of temperature changing substance 40 (for 100 ml of water at a temperature of 20 ° C.): common with structure A.
Absorption rate of superabsorbent polymer in absorber 56: common with structure A.
The basis weight of the superabsorbent polymer in the absorber 56: common to the structure A.
Size of the portion having the superabsorbent polymer in the absorber 56: common to the structure A.

(Experimental method and experimental results)
Prepare artificial urine at a temperature of 37 ° C. and a volume of 50 cc in a beaker, and supply this artificial urine in about 3 seconds from the top of the center of the sample in the front-rear direction and the center in the width direction in about 3 seconds. A range with a diameter of 5 cm at the center and in the center in the width direction was measured every predetermined time with a non-contact type thermometer.

  A graph of the measurement results is shown in FIG. As can be seen from this graph, the samples 1 to 5 of the structure A and the sample 6 of the structure B according to the present invention have a lower temperature decrease rate and a lower minimum temperature than the commercially available products. Moreover, the minimum temperature could be maintained.

  The present invention can be applied to a wide range of uses such as pants-type, tape-type, and pad-type absorbent articles.

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. 6 is a sectional view taken along line 6-6 in FIG. It is 7-7 sectional drawing of FIG. It is 8-8 sectional drawing of FIG. It is a top view in the state where a diaper was developed showing only a principal part of a pants type disposable diaper with a size. It is sectional drawing which shows only the principal part of an underpants type disposable diaper with a dimension. It is a front view of a product state. It is a rear view of a product state. It is principal part sectional drawing of another form. It is principal part sectional drawing of another form. It is principal part sectional drawing of another form. It is a graph of an experimental result.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 ... Girth part, 11 ... Liquid impervious sheet, 12F ... Abdominal side exterior sheet, 12B ... Back side exterior sheet, 200 ... Interior body, 30 ... Surface sheet, 40 ... Temperature change substance, 50 ... Absorption element, 52 ... Fibers 54... Superabsorbent polymer particles 56. Absorber 58. Cover sheet 60. Side barrier cuff 62. Barrier sheet 70.

Claims (7)

In a disposable absorbent article provided with an absorption part in which an absorption element is interposed between a liquid-permeable top sheet and a back side sheet, in a part including a crotch part,
The absorbent element includes an absorbent body including at least a superabsorbent polymer in a surface side layer, a temperature change substance disposed on the surface of the absorbent body for cooling or heating urine by contact with urine, and the absorbent body. And a covering sheet that wraps the temperature change substance,
A disposable absorbent article characterized by that.   The disposable absorbent article according to claim 1, wherein the absorbent body has a higher density of the superabsorbent polymer on the front side than on the back side. In a disposable absorbent article provided with an absorption part in which an absorption element is interposed between a liquid-permeable top sheet and a back side sheet, in a part including a crotch part,
The absorbent element includes an absorber, a temperature change layer that is disposed on the surface of the absorber, and contains a temperature change substance that cools or heats urine by contact with urine and a superabsorbent polymer, and the absorber. And a covering sheet that wraps the temperature change layer,
A disposable absorbent article characterized by that. The liquid-permeable surface sheet is made of a nonwoven fabric having a thickness of 0.5 mm or less and a basis weight of 10 to 40 g / m ² .
The covering sheet is made of crepe paper or nonwoven fabric having a thickness of 0.2 mm or less and a basis weight of 5 to 25 g / m ² .
The portion that overlaps at least the portion having the superabsorbent polymer between the liquid-permeable surface sheet and the absorbent element has no other member,
The temperature-changing substance causes endothermic reaction when dissolved in urine, cools urine, and has a solubility in 100 ml of water of 20 ml of 100 ml of 20 ml of temperature of 30 g or more,
The basis weight of the temperature change substance is 300 to 800 g / m ² ,
The area of the portion having the temperature change substance is 2,500 to 20,000 mm ² ;
The total amount of heat change that can occur in the absorber due to the temperature change material is 50 cal or more,
The calorie change per unit area of the portion having the temperature change substance is 1 cal / cm ² or more,
The superabsorbent polymer has an absorption rate of 50 seconds or less,
The basis weight of the superabsorbent polymer is 50 to 400 g / m ² ,
The area of the portion having the superabsorbent polymer is 2,500 to 20,000 mm ² .
The disposable absorbent article according to any one of claims 1 to 3. In a disposable absorbent article provided with an absorption part in which an absorption element is interposed between a liquid-permeable top sheet and a back side sheet, in a part including a crotch part,
Between the liquid-permeable surface sheet and the absorbent element, a temperature change substance that cools or heats urine by contact with urine and a superabsorbent polymer that absorbs and holds urine cooled or heated by the temperature change substance are included. With temperature change layer,
A disposable absorbent article characterized by that. The liquid-permeable surface sheet is made of a nonwoven fabric having a thickness of 0.5 mm or less and a basis weight of 10 to 40 g / m ² .
The portion that overlaps at least the portion having the superabsorbent polymer between the liquid-permeable surface sheet and the temperature change layer has no other member,
The temperature-changing substance causes endothermic reaction when dissolved in urine, cools urine, and has a solubility in 100 ml of water at a temperature of 20 ° C. of 30 g or more,
The basis weight of the temperature change substance is 300 to 800 g / m ² ,
The area of the portion having the temperature change substance is 2,500 to 20,000 mm ² ;
The total amount of heat change that can be generated in the temperature change layer by the temperature change material is 50 cal or more,
The calorie change per unit area of the portion having the temperature change substance is 1 cal / cm ² or more,
The superabsorbent polymer has an absorption rate of 50 seconds or less,
The basis weight of the superabsorbent polymer is 50 to 400 g / m ² ,
The area of the portion having the superabsorbent polymer is 2,500 to 20,000 mm ² .
The disposable absorbent article according to claim 5.   The disposable absorbent article according to any one of claims 1 to 6, comprising a portion having the superabsorbent polymer on at least one of front and rear sides and a width direction both sides of the portion having the temperature change substance.

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