JP2014117467A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article facilitating the accurate color change of an indicator, and improved in the accuracy of a replacement period.SOLUTION: A diaper 1A is arranged with an indicator coating region 60 where an indicator 6 is coated, between a rear surface sheet 3 and an absorber 4. The absorber 4 comprises a lower layer absorber 41 extending to the whole length of the diaper 1A, and an upper layer absorber 42 extending from a belly side part A only to a crotch part C, and is divided into a main absorption region 4M where the upper layer absorber 42 and the lower layer absorber 41 are overlapped, and the other sub absorption region 4E. The basis weight of the absorption polymer of the lower layer absorber 41 is larger in the main absorption region 4M than in the sub absorption region 4E, and the basis weight of the absorption polymer of the upper layer absorber 42 is smaller than that of the lower layer absorber 41. The indicator coating region 60 is arranged in the main absorption region 4M, and an edge part 60b on the side of the back side part B of the indicator coating region 60 is near an edge part 4Mb on the side of the back side part B of the main absorption region 4M.

Description

  The present invention relates to an absorbent article such as a disposable diaper.

  Conventionally, a disposable diaper provided with an indicator for judging whether or not a wearer excretes by color is known. As a disposable diaper provided with an indicator, for example, the applicant previously provided a skin-side absorber positioned on the wearer's skin side and a non-skin-side absorber positioned on the wearer's non-skin side, A disposable diaper was proposed in which an indicator that visually changes by contact with liquid is provided between the side absorbent body and the back sheet on the non-skin contact surface side (see Patent Document 1). The disposable diaper described in Patent Document 1 has a color change caused by excreted urine or the like, and the replacement time is easily recognized.

JP 2011-240049 A

  In general, an absorbent article such as a disposable diaper has a high rate of urination absorption from the crotch portion corresponding to the urination port to the abdomen, and conversely, urination is difficult to diffuse from the urination port to the back side. is there. Here, in the disposable diaper described in Patent Document 1, each of the skin side absorbent body and the non-skin side absorbent body is disposed from the abdominal side part to the back side part, and the indicator is also provided from the abdominal side part to the back side part. It is distributed over. Therefore, when there is urination, the part of the indicator placed on the back side may not be easily discolored, and if the replacement judgment is made using the indicator that no discoloration of the part has occurred, Urination may leak out from the area, and there is room for improvement in the accuracy of replacement. In addition, Patent Document 1 describes anything about how to arrange the skin-side absorbent body and the non-skin-side absorbent body and how to arrange them and the indicator in order to achieve the above-described effect. Not.

  Therefore, the present invention relates to providing an absorbent article that can satisfy the aforementioned needs.

  The present invention comprises a top sheet disposed on the skin facing surface side, a back sheet disposed on the non-skin facing surface side, and an absorber disposed between these two sheets, abdominal side portion, back side portion And a vertically long absorbent main body divided into the crotch, and the absorbent main body is provided with an indicator coating with an indicator for indicating excretion by a color change between the back sheet and the absorbent body. An absorbent article in which a work area is arranged in a vertical direction, wherein the absorber is arranged on a lower layer absorber extending from the abdominal side part to the dorsal side part and on a skin facing surface of the lower layer absorber. An upper layer absorbent body that extends only from the ventral side portion to the crotch portion, and in a plan view, the main absorbent region in which the upper layer absorbent body and the lower layer absorbent body overlap, and other than the main absorbent region The absorber is divided into an absorption polymer and a cellulosic material. The lower layer absorbent has a basis weight of the absorbent polymer in a region belonging to the main absorbent region is larger than a basis weight of the absorbent polymer in a region belonging to the sub absorbent region, and the upper layer absorbent is The basis weight of the absorbent polymer is smaller than the basis weight of the absorbent polymer of the lower layer absorber, or does not include the absorbent polymer, and the indicator coating region is the main absorbent in plan view of the absorbent article. An absorbent article that is disposed in the region, and an end on the back side in the longitudinal direction of the indicator coating region is disposed in the vicinity of the end on the back side in the longitudinal direction of the main absorbent region. It is to provide.

  According to the absorbent article of the present invention, the indicator is easily easily discolored, and the accuracy of replacement is improved. Thus, since the accuracy of the replacement time is improved, according to the absorbent article of the present invention, it is difficult for body fluid such as urine to leak out from the crotch portion without losing the replacement time.

FIG. 1 is a partially broken plan view of an unfolded disposable diaper according to a first embodiment of the present invention as viewed from the top sheet side. 2 is a cross-sectional view taken along the line II of FIG. 3 is a cross-sectional view taken along line II-II in FIG. 4 (a) to 4 (e) are diagrams for explaining other embodiments of the indicator coating region provided in the disposable diaper. FIG. 5 is a cross-sectional view of the crotch part of the unfolded disposable diaper according to the second embodiment of the present invention as viewed in the horizontal direction (corresponding to FIG. 2). FIG. 6 is a vertical cross-sectional view of the unfolded disposable diaper according to the second embodiment of the present invention as viewed in the vertical direction (corresponding to FIG. 3). FIG. 7 is a diagram of an apparatus used for the method for measuring the liquid permeation time.

  Hereinafter, the absorbent article of this invention is demonstrated based on the preferable 1st Embodiment, referring FIGS. 1-3. FIG. 1 shows a partially broken plan view of the unfolded disposable diaper according to the first embodiment of the present invention as viewed from the surface sheet side, and FIG. 2 shows a cross-sectional view taken along the line II of FIG. It is shown. 3 shows a cross-sectional view taken along the line II-II in FIG.

  As shown in FIG. 1, the disposable diaper 1A of 1st Embodiment (henceforth "diaper 1A") was distribute | arranged to the surface sheet 2 distribute | arranged to the skin opposing surface side, and the non-skin opposing surface side. It has a vertically long absorbent main body 10 divided into abdominal side A, back side B, and crotch C, comprising back sheet 3 and absorbent body 4 disposed between both sheets 2 and 3. ing. And in the absorptive main body 10, the indicator coating area | region 60 to which the indicator 6 which notifies excretion by the change of a color is distribute | arranged between the back surface sheet 3 and the absorber 4 in the vertical direction. As shown in FIG. 1, the diaper 1A is formed symmetrically with respect to a center line CL extending in the vertical direction.

The diaper 1 </ b> A will be described in detail. As shown in FIG. 1, the absorbent main body 10 of the diaper 1 </ b> A is in the vertical direction (hereinafter also referred to as “Y direction”. , A ventral part A, a dorsal part B, and a crotch part C positioned between these A and B. The abdomen A is a part located on the wearer's abdomen when the diaper is worn, the dorsal part B is a part located on the wearer's back, and the crotch C is located on the inseam of the wearer. It is a part to do. The crotch part C is located in the center part of the longitudinal direction (Y direction) of the diaper 1A. The direction orthogonal to the vertical direction (Y direction) will be described as the horizontal direction of the diaper 1A (hereinafter also referred to as “X direction”).
Moreover, in this specification, a "skin opposing surface" is a surface distribute | arranged to a wearer's skin side at the time of wear among front and back both surfaces of each member, such as the surface sheet 2 which comprises diaper 1A, The “skin facing surface” is a surface of the front and back surfaces of each member such as the surface sheet 2 that is directed to the side opposite to the wearer's skin side when worn.

  As shown in FIG. 1, the absorbent main body 10 of the diaper 1 </ b> A has left and right side edges along the longitudinal direction (Y direction) of the ventral side A and left and right side edges along the longitudinal direction (Y direction) of the back side B. Extends outward in the lateral direction (X direction) from the left and right side edges along the longitudinal direction (Y direction) of the crotch C. The left and right side edges of the crotch portion C are convexly curved in the lateral direction (X direction) inward (center line CL), and the central portion in the longitudinal direction (Y direction) is bound inward as a whole. It has a shape. The top sheet 2 and the back sheet 3 respectively extend outward from left and right side edges along the longitudinal direction (Y direction) of the absorber 4 and front and rear end edges in the longitudinal direction (Y direction). As shown in FIG. 2, the surface sheet 2 has a lateral dimension (X direction) smaller than a lateral dimension (X direction) of the back sheet 3. Each of the top sheet 2 and the back sheet 3 is joined to each other directly or through another member at an extending portion extending outward from the outer peripheral edge of the absorbent body 4 to sandwich the absorbent body 4. It is fixed.

  In the absorbent main body 10 of the diaper 1 </ b> A, as shown in FIGS. 1 and 2, side sheets 5 are arranged on both side portions 10 s and 10 s along the vertical direction (Y direction) via the surface sheet 2. . As shown in FIG. 1, the side sheet 5 is disposed and fixed on the skin facing surface side of the top sheet 2 and over the entire side part along the vertical direction (Y direction). As shown in FIG. 2, the end of each side seat 5 on the inner side in the X direction (near the center line CL) is a free end, and a three-dimensional gather is formed in the crotch C near the free end. The elastic member 51 for use is arranged and fixed in an elongated state in the vertical direction (Y direction), and when worn, a portion having a predetermined width from the free end is separated from the top sheet 2 by the contraction force of the elastic member. Form a gather.

  As shown in FIG. 2, the end on the outer side in the X direction of each side sheet 5 is fixed to the back sheet 3, and between the outer end of each side sheet 5 and the back sheet 3. In the crotch part C, the elastic member 52 for leg gather formation is disposed and fixed in an elongated state in the vertical direction (Y direction), and when gathered, the leg gather is formed by the contraction force of the elastic member. The

  As shown in FIG. 1, the diaper 1 </ b> A is a so-called unfolded diaper, and has a pair of left and right stretchable panels 7 b and 7 b that are continuously provided on the left and right sides of the back side B of the absorbent main body 10. Yes. The pair of stretchable panels 7b, 7b of the diaper 1A has an end portion near the center line CL at the back side portion B fixed to the non-skin facing surface of the back sheet 3, and the back side portion of the absorbent main body 5 It is continuously provided on both the left and right sides of B. In the diaper 1 </ b> A, the pair of stretchable panels 7 b and 7 b are fixed to the non-skin facing surface of the back sheet 3, but between the side sheet 5 and the back sheet 3 arranged via the top sheet 2. It may be fixed with. A fastening tape 72 to which a fastening portion 71 made of a male member of a mechanical surface fastener is attached is attached to each of the stretchable panels 7b so as to extend outward in the X direction. The stretchable panel 7b is fixed to the absorbent main body 10 using means such as an adhesive or fusion.

  Moreover, as shown in FIG. 1, the diaper 1A has a pair of left and right panel members 7a and 7a that are continuously provided on both the left and right sides of the abdominal side portion A of the absorbent main body 10. As shown in FIG. 1, the pair of panel members 7 a and 7 a of the diaper 1 </ b> A has a side sheet 5 and a back sheet whose end portions near the center line CL are arranged via the top sheet 2, as shown in FIG. 1. 3 and is connected to both the left and right outer sides of the abdominal side A of the absorbent main body 5. In the diaper 1 </ b> A, the pair of panel members 7 a and 7 a are fixed between the side sheet 5 and the back sheet 3, but may be fixed to the non-skin facing surface of the back sheet 3. The panel material 7a is fixed to the absorbent main body 10 using means such as an adhesive or fusion. Further, on the non-skin facing surface of the abdominal side A, a landing tape 73 for fastening the fastening portion 71 of the fastening tape 72 of the back side B is provided between the pair of panel members 7a and 7a. ing.

  As shown in FIG. 1, the absorbent body 4 includes a lower layer absorbent body 41 extending from the abdominal part A to the dorsal part B, and an abdominal part A disposed on the skin-facing surface of the lower layer absorbent body 41 to the crotch part C. It consists of the upper layer absorber 42 covering only. In the diaper 1, as shown in FIGS. 2 and 3, the upper absorbent body 42 extends only from the ventral side A to the crotch C, and the lower absorbent body 41 extends from the ventral side A to the crotch C and further to the back. Since it extends to the side portion B, the lower layer absorber 41 is formed longer than the upper layer absorber 42 in the longitudinal direction (longitudinal direction (Y direction)). More preferably, when the lower layer absorber 41 has a vertically long rectangular shape, the width of the upper layer absorber 42 is shorter than the width of the lower layer absorber 41. Since the flexibility of the absorbent body 4 can be easily obtained by narrowing the upper absorbent body 42, the fit to the body is good. The length in the vertical direction (Y direction) is also shortened from the upper layer absorbent body 42 as described above, so that it becomes easier to bend from the abdominal side A to the back side B, and the fit to the body is improved. However, when the lower layer absorbent body 41 has a shape constricted by the crotch part C, the width of the upper layer absorbent body 42 and the width of the lower layer absorbent body 41 may be equal only in the crotch part C. Specifically, the length in the longitudinal direction (Y direction) is 20% or more, preferably 40% or more, 80% or less, preferably 60% or less, of the upper layer absorber 42 of the lower layer absorber 41. The width of the upper absorber 42 is 40% or more, preferably 60% or more, 95% or less, preferably 80% or less of the lower absorber 41.

As shown in FIG. 2 and FIG. 3, the lower layer absorbent body 41 includes a lower layer absorbent core 411 and a covering material 412 that wraps the lower layer absorbent core 411, and the lower layer absorbent core 411 is coated with the lower layer absorbent core 411. 412 is formed by wrapping. The upper layer absorbent body 42 does not have a covering material and is formed only from the upper layer absorbent core 421. The basis weight of the lower layer absorbent core 411 is preferably 100 g / m ² or more and 1000 g / m ² or less, and the basis weight of the covering material 412 is preferably 3 g / m ² or more and 20 g / m ² or less. On the other hand, the basis weight of the upper absorbent core 421 is preferably 50 g / m ² or more and 500 g / m ² or less.

  The lower layer absorbent core 41 will be described in detail. The lower layer absorbent core 411 is configured such that, in the diaper 1A, as shown in FIG. 1, both side edges and the back side B side along the longitudinal direction (Y direction) on the ventral side A side. Both side edges along the vertical direction (Y direction) of the crotch part C extend laterally (X direction) outward from both side edges along the vertical direction (Y direction) of the crotch C, and as a whole the vertical direction (Y direction) ) The portion closer to the ventral side A from the center is formed in a shape that is bound inward. Moreover, as for the lower layer absorptive core 411, in the diaper 1A, as shown in FIG.2 and FIG.3, each skin opposing surface and non-skin opposing surface of the lower layer absorptive core 411 are flat. In the diaper 1 </ b> A, the lower layer absorbent body 41, as shown in FIG. 2, folds both sides of the coating material 412 using a single coating material 412, so that the non-skin facing surface side of the lower layer absorbent core 411 The lower absorbent core 411 is wrapped around the side edges of the covering material 412 on the back sheet 3 side. The lower layer absorbent body 41 thus formed is formed from the ventral side A to the back side B. In the diaper 1 </ b> A, as described above, the lower layer absorbent body 41 is formed by wrapping the lower layer absorbent core 411 with one covering material 412. It may be formed by being sandwiched between two covering materials 412 arranged on the opposite surface side.

  The upper layer absorbent body 42 will be described in detail. In the diaper 1A, the upper layer absorbent core 421 has a width between the side edges of the crotch part C of the lower layer absorbent core 411 of the lower layer absorbent body 41 as shown in FIG. It is substantially coincident with the width, and is formed in a rectangular shape that is long in the longitudinal direction (Y direction) extending only from the ventral side A to the crotch C. Moreover, as for the upper layer absorptive core 421, in the diaper 1A, as shown in FIG.2 and FIG.3, each skin opposing surface and non-skin opposing surface of the upper layer absorptive core 421 are flat. And the upper layer absorber 42 is formed only by the upper layer absorptive core 421 as shown in FIG. The upper layer absorbent body 42 thus formed is formed only from the ventral side A to the crotch C. That is, the upper layer absorber 42 is not formed on the back side portion B.

  As shown in FIG. 1, the absorber 4 includes a main absorption region 4M in which the upper layer absorber 42 and the lower layer absorber 41 overlap each other, and a sub absorption region 4E other than the main absorption region 4M. It is divided into. In other words, the main absorption region 4M is a region having a two-layer structure including the upper layer absorber 42 and the lower layer absorber 41, and the sub absorption region 4E is a region having a single layer structure including only the lower layer absorber 41. More specifically, in the diaper 1A, as shown in FIG. 1, since the width of the upper absorbent core 421 substantially matches the width of the lower layer absorbent body 41 at the narrowest position, The entirety of the absorbent core 421 is disposed on the lower layer absorbent body 41 having a shape in which the central portion is bound inward. Therefore, in the diaper 1A, the main absorbent region 4M having a two-layer structure in which the upper absorbent core 421 and the lower absorbent body 41 overlap each other means a region in which the upper absorbent core 421 is arranged, and the sub absorbent region 4E. Means a region composed of only a single layer of the lower absorbent body 41 where the upper absorbent core 421 is not disposed.

The absorber 4 includes an absorption polymer and cellulose fibers. In the lower layer absorbent body 41, the basis weight of the absorption polymer in the region belonging to the main absorption region 4M is larger than the basis weight of the absorption polymer in the region belonging to the sub absorption region 4E. Specifically, the lower layer absorbent core 411 of the lower layer absorbent body 41 is formed of an absorbent polymer and cellulose fibers in the diaper 1A. The basis weight of the absorbent polymer in the region belonging to the main absorbent region 4M in the lower layer absorbent core 411 is preferably 50 g / m ² or more, more preferably 100 g / m ² or more, and preferably 500 g / m ² or less. More preferably, it is 400 g / m ² or less, specifically 50 g / m ² or more and 500 g / m ² or less, more preferably 100 g / m ² or more and 400 g / m ² or less. The basis weight of the cellulose fiber in the region belonging to the main absorbent region 4M in the lower layer absorbent core 411 is preferably 0 g / m ² or more, preferably 300 g / m ² or less, more preferably 200 g / m ² or less. There, in particular, is preferably 0 g / m ² or more 300 g / m ² or less, and more preferably 0 g / m ² or more 200 g / m ² or less. On the other hand, the basis weight of the absorbent polymer in the region belonging to the sub absorbent region 4E in the lower absorbent core 411 is preferably 20 g / m ² or more, more preferably 50 g / m ² or more, and preferably 400 g / m ^2. In the following, it is more preferably 300 g / m ² or less, specifically, preferably 20 g / m ² or more and 400 g / m ² or less, more preferably 50 g / m ² or more and 300 g / m ² or less. . The basis weight of the cellulose fiber in the region belonging to the sub absorbent region 4E in the lower layer absorbent core 411 is preferably 0 g / m ² or more, preferably 250 g / m ² or less, more preferably 200 g / m ² or less. There, in particular, is preferably 0 g / m ² or more 250 g / m ² or less, and more preferably 0 g / m ² or more 200 g / m ² or less. Further, the basis weight of the absorbent polymer in the region belonging to the main absorbent region 4M in the lower absorbent core 411 is more efficient than the basis weight of the absorbent polymer in the region belonging to the sub absorbent region 4E in the lower absorbent core 411. From the standpoint of absorption, it is preferably 10 g / m ² or more, more preferably 20 g / m ² or more. The basis weight of the absorption polymer and cellulose fiber in the region belonging to the main absorption region 4M in the lower absorbent core 411, and the basis weight of the absorption polymer and cellulose fiber in the region belonging to the sub absorption region 4E are measured by the following methods.

<Measurement Method of Absorption Polymer and Cellulose Fiber Basis Weight of Region in Main Absorption Region 4M in Lower Absorbent Core 411, and Absorption Polymer and Cellulosic Fiber Basis Weight of Region belonging to Sub Absorption Region 4E>

First, the absorber 4 is placed on a horizontal base, and cut into a size of 70 mm × 70 mm in the main absorption region 4M where the upper layer absorber 42 and the lower layer absorber 41 overlap, and the upper layer is cut from the cut sample. The part of the absorber 42 and the covering material 412 are removed, and this is used as a sample of a region belonging to the main absorbent region 4M in the lower absorbent core 411. When it is difficult to cut a predetermined sample size due to the size of the absorber, the sample size to be cut may be changed according to the size of the absorber. A sample of the same weight is sealed in a nylon pack (mesh no. 250) bag sealed with a heat seal, and the sample is dissolved in an aqueous solution of 0.1% ascorbic acid and 0.01% riboflavin (Vitamin B2). It is immersed until it absorbs and expands, and exposed to sunlight for 20 hours or more. Thereafter, the sample is washed with water at any time until the yellow color of the sample in the pack is no longer detected or until the pulp becomes white, and the water-soluble polymer is rinsed out of the pack. Next, it is subjected to centrifugal dehydration for 10 minutes under the condition of 800 rpm, dried at 80 ° C. for 12 to 24 hours, and the weight loss from the sample is calculated as the amount of absorbed polymer, and the weight loss is calculated from the weight of the sample. The amount obtained by subtracting the minutes is defined as the amount of cellulose fiber. The number of samples is 3 or more, the average value thereof is obtained, and the basis weight of each absorbent polymer and the basis weight of each cellulose fiber are calculated from the area of the cut sample. Similarly, the basic weight of the absorption polymer and cellulose fiber of the area | region which belongs to the sub absorption area | region 4E in the lower layer absorbent core 411 is measured.

It is preferable that the upper layer absorbent body 42 quickly transfers the liquid to the lower layer absorbent body 41. From this point, the upper layer absorbent core 421 of the upper layer absorbent body 42 can use at least cellulose fibers, and more preferably is formed from crosslinked cellulose fibers. Use the stacked fiber. The upper layer absorber 42 does not include a coating material. However, when an absorbent polymer is included, the upper layer absorber 42 may be wrapped with a coating material 412 that wraps the lower layer absorber 41. Only the body 42 may be wrapped with a covering material. The upper layer absorbent body 42 is one in which the basis weight of the absorbent polymer is smaller than the basis weight of the absorbent polymer of the lower layer absorbent body 41 or does not contain the absorbent polymer. Specifically, in the diaper 1A, the upper layer absorbent body 42 (upper layer absorbent core 421) is a piled body formed from crosslinked cellulose fibers, and the basis weight of the contained absorbent polymer is preferably 0 g / m. ² or more, preferably 300 g / m ² or less, more preferably 200 g / m ² or less, specifically 0 g / m ² or more and 300 g / m ² or less, preferably 0 g / m 2. and more preferably ² or more 200 g / m ² or less. The basis weight of the cellulose fibers of the upper absorbent core 421 is preferably 50 g / m ² or more, more preferably 100 g / m ² or more, preferably 500 g / m ² or less, more preferably 300 g / m ² or less. Specifically, it is preferably 50 g / m ² or more and 500 g / m ² or less (the same basis weight as the above-described upper absorbent core 421), and is 100 g / m ² or more and 300 g / m ² or less. More preferably it is. Further, the basis weight of the absorbent polymer of the lower layer absorbent core 411 (the average value of the basis weight of the absorbent polymer in the region belonging to the main absorbent region 4M and the basis weight of the absorbent polymer in the region belonging to the sub absorbent region 4E in the lower layer absorbent core 411) ) Is preferably 100 g / m ² or more, more preferably 150 g / m ² or more, preferably 400 g / m ² or less, more preferably 350 g / m ² or less. It is preferably m ² or more and 400 g / m ² or less, and more preferably 150 g / m ² or more and 350 g / m ² or less. Further, the basis weight of the absorbent polymer of the upper layer absorbent body 421 is the basis weight of the absorbent polymer of the lower layer absorbent core 411 (the basis weight of the absorbent polymer in the region belonging to the main absorbent region 4M in the lower layer absorbent core 411 and the sub absorbent region 4E. From the viewpoint of improving liquid diffusibility, it is preferably 50 g / m ² or less, and more preferably 100 g / m ² or more. The basis weight of the absorbent polymer of the upper layer absorbent body 421 is measured by the following method.

<Measurement Method of Basis Weight of Absorbing Polymer of Upper Layer Absorber 421 and Cellulose Fiber>
First, the upper layer absorber 42 and the lower layer absorber 41 are separated, and the separated upper layer absorber 42 is placed on a horizontal base and cut into a size of 70 mm × 70 mm, which is used as a measurement sample. The measurement is as described above <Measurement method of the basis weight of the absorption polymer and cellulose fiber belonging to the main absorption region 4M in the lower absorbent core 411, and the basis weight of the absorption polymer and cellulose fiber belonging to the sub absorption region 4E>. It carries out similarly to the method of description, and it is set as the basic weight of the absorption polymer of an upper layer absorber 421, and a cellulose fiber.

The absorption polymer included in the absorber 4 will be specifically described below.
From the standpoint of absorption and retention of excreta, the absorbent polymer has a water absorption of preferably 10 g / g or more, more preferably 15 g / g or more, and preferably 50 g / g or less, more preferably 30 g / g. Specifically, it is preferably 10 g / g or more and 50 g / g or less, and more preferably 15 g / g or more and 30 g / g or less. The water absorption amount of the absorption polymer can be determined by a method for measuring the amount of centrifugal retention in accordance with JIS K 7223. The centrifugal retention amount of the water-absorbing polymer is a characteristic related to the water absorption amount (water absorption ratio) of the water-absorbing polymer. Generally, a water-absorbing polymer having a large centrifugal retention amount also has a large water absorption amount.

<Measuring method of centrifugal retention (water absorption)>
The centrifugal retention amount (water absorption amount) is measured according to JIS K 7223 (1996). Nylon woven fabric (mesh opening 255, sold by Sanriku Manufacturing Co., Ltd., product name: nylon net, standard: 250 x mesh width x 30 m) is cut into a rectangle with a width of 10 cm and a length of 40 cm and folded in half at the center in the longitudinal direction. Both ends are heat-sealed to produce a nylon bag having a width of 10 cm (inner dimension: 9 cm) and a length of 20 cm. Next, 1.00 g of an absorption polymer as a measurement sample is precisely weighed and placed uniformly at the bottom of the produced nylon bag. Next, the nylon bag containing the sample is immersed in physiological saline (0.9 mass% sodium chloride water) adjusted to 25 ° C. Then, after 1 hour from the start of immersion, the nylon bag is taken out from the physiological saline, suspended in a vertical state for 1 hour and drained, and then dehydrated using a centrifugal dehydrator (Kokusan Co., Ltd., model H-130C special model). The dehydration condition is 143 G (800 rpm) for 10 minutes. After dehydration, the mass of the sample is measured, and the target centrifugal retention amount (water absorption amount) is calculated according to the following formula.
Centrifugal retention amount (g / g) = (a′−b−c) / c
In the formula, a ′ is the total mass (g) of the sample and nylon bag after centrifugal dehydration, b is the mass (g) of the nylon bag before water absorption (during drying), and c is the mass of the sample before water absorption (during drying). (G) is represented. The measurement was performed 5 times (n = 5), the values at each of the upper and lower points were deleted, and the average value of the remaining three points was taken as the measured value. The measurement is performed at 23 ± 2 ° C. and humidity 50 ± 5%, and the sample is measured after being stored in the same environment for 24 hours or more.

  Further, the absorption polymer has an absorption amount under pressure at 2.0 kPa of preferably 10 g / g or more, more preferably 15 g / g or more, from the viewpoint of absorption and retention of excrement during pressurization. Is 50 g / g or less, more preferably 30 g / g or less, specifically 10 g / g or more and 50 g / g or less, more preferably 15 g / g or more and 30 g / g or less. Here, the load of 2.0 kPa substantially corresponds to the body pressure applied to the absorbent body when the absorbent article is worn. The amount of absorption under pressure is a measure of how much the absorbent polymer can absorb in a state where pressure is applied to the absorbent body by wearing the absorbent article.

<Measurement method of absorption under pressure>
The amount of absorption under pressure is measured using a measuring method and measuring apparatus described in JP-A-2003-235889. That is, prepare a nylon mesh having a mesh size of 63 μm (cylindrical plastic tube (inner diameter 30 mm, height 60 mm) with JIS Z8801-1: 2000 pasted on the bottom. Next, 0.50 g of a sample (absorbing polymer) is precisely weighed, The sample is placed on a nylon mesh of a vertical cylindrical plastic tube so that the sample has a substantially uniform thickness, and then a weight of 29.5 mm in outer diameter and 22 mm in thickness is cylindrical so that a load of 2.0 kPa is applied to the sample. Next, a cylindrical plastic tube containing a sample and a weight in a petri dish (diameter: 120 mm) containing 60 ml of physiological saline is immersed vertically with the nylon mesh side facing down. For 60 minutes, then the cylindrical plastic tube containing the sample and the weight was taken out and drained for 15 minutes. Next, weigh the cylindrical plastic tube containing the sample and the weight, and calculate the weight of the physiological saline absorbed by the sample.The value obtained by dividing the weight of the absorbed physiological saline by 0.5 is the absorption amount under pressure ( Measurement is performed 5 times (n = 5), the value at each of the upper and lower points is deleted, and the average value of the remaining three points is taken as the measured value. Measurement is performed at 50 ± 5%, and the sample is stored in the same environment for 24 hours or more before measurement.

  Further, the absorption polymer has a liquid passage rate under pressure of 2.0 kPa, preferably 5 ml / min or more, more preferably 10 ml / min or more, from the viewpoint of diffusibility of the liquid during pressurization. Is 150 ml / min or less, more preferably 120 ml / min or less, specifically 5 ml / min or more and 150 ml / min or less, more preferably 10 ml / min or more and 120 ml / min or less. The liquid passing rate under pressure is generally useful as an index of the diffusion / permeation rate of the liquid in the absorber.

<Measurement method of liquid flow rate under pressure>
The liquid passing rate under pressure is measured using a measuring method and a measuring apparatus described in JP-A-2003-235889. That is, in a 100 mL glass beaker, a sufficient amount of physiological saline (0.9 mass% sodium chloride water) to swell the absorption polymer 0.32 ± 0.005 g as a measurement sample, for example, the saturated absorption amount of the absorption polymer Immerse it in 5 times more saline and leave it for 30 minutes. Separately, at the lower end of an opening of a vertically standing cylinder (inner diameter 25.4 mm), a wire mesh (mesh opening 150 μm, biocolumn sintered stainless steel filter 30SUS sold by Sansho Co., Ltd.) and a capillary (with an inner diameter of 2 mm) ( A filtration cylindrical tube having an inner diameter of 4 mm and a length of 8 cm) is prepared, and the contents of the beaker including the swollen measurement sample are put into the cylindrical tube with the cock closed. Next, a cylindrical rod having a diameter of 2 mm with a wire mesh having an opening of 150 μm and a diameter of 25 mm is inserted into the filtration cylindrical tube so that the wire mesh and the measurement sample are in contact with each other. Put a weight so that the load of. After standing in this state for 1 minute, the cock is opened to flow the liquid, and the time until the liquid level in the filtration cylindrical tube reaches the 40 mL scale line from the 60 mL scale line (that is, 20 mL of liquid passes) (T ₁ ) (Seconds). Using the measured time T ₁ (seconds), the liquid flow rate under pressure at 2.0 kPa is calculated from the following equation. In the equation, T ₀ (seconds) is a value obtained by measuring the time required for 20 ml of physiological saline to pass through the wire mesh without putting the measurement sample in the filtering cylindrical tube.
Flow rate under pressure (ml / min) = 20 × 60 / (T ₁ −T ₀ )
The measurement is performed 5 times (n = 5), the values at each of the upper and lower points are deleted, and the average value of the remaining three points is taken as the measured value. The measurement is performed at 23 ± 2 ° C. and humidity 50 ± 5%, and the sample is measured after being stored in the same environment for 24 hours or more. A more detailed method for measuring the flow rate under pressure is described in paragraphs [0008] and [0009] of Japanese Patent Application Laid-Open No. 2003-235889, and the measuring apparatus is shown in FIGS. Have been described.

  The absorption polymer has an absorption rate measured according to the DW method of preferably 10 ml / (g · 10 minutes) or more, more preferably 20 ml / (g · 10 minutes) or more, from the viewpoint of quickly absorbing and holding urine. Yes, preferably 100 ml / (g · 10 minutes) or less, more preferably 70 ml / (g · 10 minutes) or less, specifically 10 ml / (g · 10 minutes) to 100 ml / (g · 10 ml) or less, more preferably 20 ml / (g · 10 minutes) or more and 70 ml / (g · 10 minutes) or less. The absorption rate by the DW method expresses the behavior of the absorption polymer that absorbs and absorbs bodily fluids, or the behavior of taking bodily fluids into the gaps between adjacent absorbent polymer particles. It is useful as an index of the shape, especially the shape retention of the absorbent after absorption of body fluid.

  The absorption polymer has an absorption rate measured according to the DW method of preferably 3 ml / (g · 1 min) or more, more preferably 5 ml / (g · 1 min) or more, from the viewpoint of quickly absorbing and holding urine. And preferably 30 ml / (g · 1 min) or less, more preferably 20 ml / (g · 1 min) or less, specifically 3 ml / (g · 1 min) or more and 30 ml / (g · 1 min). 1 minute) or less, preferably 5 ml / (g · 1 minute) or more and 20 ml / (g · 1 minute) or less.

<Measurement method of absorption rate by DW method>
The absorption rate by the DW method is measured using a Demand Wetability Tester device. Specifically, in this apparatus, the level of the physiological saline solution is set at the same water level as the surface of the polymer spraying table [70 mmφ, No, 2 filter paper placed on the glass filter No, 1], and the polymer spraying is performed. Spread 0.3 g of the absorbent polymer to be measured on the surface of the table. The water absorption at the time when the absorbent polymer is sprayed is 0, and the water absorption is measured after 1 minute and after 10 minutes. The amount of water absorption is measured by a burette scale indicating the amount of decrease in the saline water level. The obtained water absorption value is defined as an absorption rate by the DW method. The measurement is performed 5 times (n = 5), the values at each of the upper and lower points are deleted, and the average value of the remaining three points is taken as the measured value. The measurement is performed at 23 ± 2 ° C. and humidity 50 ± 5%, and the sample is measured after being stored in the same environment for 24 hours or more.

  The above-mentioned absorption polymer is preferably one that can absorb and retain a liquid 20 times or more of its own weight and can gel. The average particle diameter is preferably 10 μm or more and 1000 μm or less, more preferably 100 μm or more and 800 μm or less. There is no restriction | limiting in particular in the shape of particle | grains, For example, various shapes, such as spherical shape, lump shape, grape shape, and bowl shape, are employable.

  The absorption polymer having the characteristics described above can be obtained, for example, by polymerizing one or more selected from the following monomers. Moreover, a crosslinking process is performed as needed. The polymerization method is not particularly limited, and various generally known methods for absorbing polymers such as a reverse phase suspension polymerization method and an aqueous solution polymerization method can be employed. Thereafter, the polymer is subjected to operations such as pulverization and classification as necessary, and surface treatment is performed as necessary.

  The monomer used in producing the absorbent polymer is a water-soluble monomer having a polymerizable unsaturated group. Specifically, olefinic unsaturated carboxylic acid or salt thereof, olefinic unsaturated carboxylic acid ester, olefinic unsaturated sulfonic acid or salt thereof, olefinic unsaturated phosphoric acid or salt thereof, olefinic unsaturated phosphate ester And vinyl monomers having polymerizable unsaturated groups such as olefinic unsaturated amines, olefinic unsaturated ammonium salts, and olefinic unsaturated amides.

The cellulose fiber contained in the absorbent body 4 will be specifically described below.
Examples of cellulose fiber include cotton, pulp fiber, and rayon fiber. The cellulose fiber of the upper absorbent body 421 and the cellulose fiber of the lower absorbent core 411 may be of the same type or different types. The cellulose fiber of the upper absorbent body 421 is preferably a crosslinked cellulose fiber from the viewpoint of improving liquid return properties, among cellulose fibers. Cross-linked cellulose fibers include modified (cellulose) fibers described in JP-T 2010-526632, for example, chemically stiffened, twisted and / or curled (curly) (cellulose) fibers. A chemically stiffened, twisted and / or curled cross-linked cellulose or synthetic polymer fiber, and the like, and these can be used alone or in admixture of two or more. Commercial products can also be used. Examples of such commercial products include “ALBACEL” (trade name) manufactured by Federal Paper Board Co., “INDORAYON” (trade name) manufactured by PT Inti Indorayon Utara, and “FILTRANIER” (trade name) manufactured by ITT Rayonier Inc. ) And “POROSANIER” (trade name) manufactured by the same company.

  The covering material 412 constituting the lower layer absorbent body 41 is preferably lower in liquid permeability than the upper layer absorbent body 42 from the viewpoint of further improving the diffusibility. The liquid permeability is evaluated by a liquid permeation time that can be measured by the following method. With respect to the liquid permeation time that can be measured by the following method, the liquid permeation time of the covering material 412 is preferably 5 seconds or longer and more preferably 8 seconds or longer as compared with the liquid permeation time of the upper absorber 42.

<Measurement method of liquid permeation time>
As shown in FIG. 7, two cylinders 91 and 92 having an inner diameter of 35 mm open at the upper and lower ends are arranged up and down with the axes of both cylinders 91 and 92 aligned, and a metal mesh net having a diameter of 55 mm, A 40 mm square cut sample piece and a piece of filter paper having a diameter of 101 mm and a diameter of 101 mm are set on the upper side and sandwiched between upper and lower cylinders 91 and 92. At this time, it is preferable that the upper and lower cylinders 91 and 92 are connected by fitting the clip 93 to an annular flange portion provided at the lower end of the upper cylinder 91 and the upper end of the lower cylinder 92. Reference numeral 94 denotes a rubber packing having a through hole having the same diameter and the same shape as the inner diameters of the cylinders 91 and 92. In this manner, with the cut sample pieces sandwiched and fixed between the upper and lower cylinders 91 and 92, 40 g of artificial urine indicated by the symbol W in FIG. The supplied artificial urine passes through the cut sample piece, passes through the lower cylinder 92, and flows down from the lower end of the cylinder 92. Observe the time-dependent change in the weight of the artificial urine flowing down from the lower cylinder 92 using a weight measuring means such as an electronic balance, and measure the time from the start of supplying the artificial urine until the mass reaches 20 g, This time is defined as the liquid permeation time. In multiple measurements, a new cut sample piece is prepared each time. The measurement is performed three times, and the average value is taken as the measured value.

  The composition of the artificial urine used for measuring the liquid permeation time is as follows. 1.94% by mass of urea, 0.7954% by mass of sodium chloride, 0.11058% by mass of magnesium sulfate (septahydrate), 0.06208% by mass of calcium chloride (dihydrate), 0.19788% by mass of potassium sulfate , Polyoxyethylene lauryl ether 0.0035 mass% and ion-exchanged water (remaining amount).

  As described above, the absorbent main body 10 is provided with the indicator coating region 60 coated with the indicator 6 informing the excretion by a color change between the back sheet 3 and the absorber 4 in the vertical direction. Yes. As shown in FIG. 2, when the diaper 1 </ b> A is viewed in plan, the indicator coating area 60 to which the indicator 6 is applied is arranged in the main absorption area 4 </ b> M of the absorber 4. The end 60b on the back side B in the vertical direction (Y direction) is arranged near the end 4Mb on the back side B in the vertical direction (Y direction) of the main absorption region 4M. Here, the indicator coating region 60 means a region surrounding the entire portion of the indicator 6 coated portion in plan view. Further, the end portion 60b on the back side portion B side of the indicator coating region 60 is disposed in the vicinity of the end portion 4Mb on the back side portion B side of the main absorption region 4M. The end portion of the indicator coating region 60 60b is not only arranged to coincide with the position of the end 4Mb of the main absorption region 4M, but the end 60b on the back side B side in the vertical direction of the indicator coating region 60 is Based on the edge of the end 4Mb on the back side B in the longitudinal direction (Y direction) (the edge of the end on the back side B in the longitudinal direction (Y direction) of the upper absorbent body 42 in the diaper 1A) Furthermore, it is only necessary to be within a range of about 10% of the length in the vertical direction (Y direction) of the main absorption region 4M (the length in the vertical direction (Y direction) of the upper absorbent body 42 in the diaper 1A). Means that. For example, in the diaper 1A, when the length of the upper layer absorber 42 in the longitudinal direction (Y direction) is 100 mm, the end portion 60b of the indicator coating region 60 is located on the back side B side of the upper layer absorber 42. It means that it should just be arranged in the range of +/- 10 mm on the basis of the edge of an edge part.

  Further, in the diaper 1A, the end 60a on the ventral side A in the vertical direction (Y direction) of the indicator coating region 60 is the end on the ventral side A in the vertical direction (Y direction) of the main absorption region 4M. It is arranged near the portion 4Ma. Here, the end portion 60a on the ventral side A side of the indicator coating region 60 is disposed in the vicinity of the end portion 4Ma on the ventral side A side of the main absorption region 4M. The portion 60a is arranged not only in alignment with the position of the end 4Ma of the main absorption region 4M, but also the end 60a on the ventral side A in the vertical direction of the indicator coating region 60 is the main absorption region 4M. The edge of the end 4Ma on the ventral side A in the vertical direction (Y direction) (the edge of the end on the ventral side A in the vertical direction (Y direction) of the upper absorbent body 42 in the diaper 1A) If it is located within the range of about 10% of the length of the main absorption region 4M in the vertical direction (Y direction) (the length of the upper absorbent body 42 in the vertical direction (Y direction) in the diaper 1A) as a reference Means good.

  The diaper 1A will be described in more detail. As shown in FIG. 1, the line 61 of one indicator 6 extends along the vertical direction (Y of the upper absorbent body 42) along the position of the center line CL extending in the vertical direction (Y direction). In the vertical direction between the line 61 of the single indicator 6 and the side edges on both sides along the vertical direction (Y direction) of the upper absorber 42. Lines 62 and 62 of two indicators 6 extending in the (Y direction) parallel to the center line CL are arranged across the front and rear end edges in the longitudinal direction (Y direction) of the upper absorber 42. Therefore, in the diaper 1 </ b> A, as shown in FIG. 3, the indicator coating region 60 surrounding the line 61 of one indicator 6 and the lines 62, 62 of the two indicators 6 has a longitudinal direction ( The end portion 60b on the back side B side in the longitudinal direction (Y direction) of the indicator coating region 60 is disposed in the longitudinal direction (Y direction) of the main absorption region 4M. It is arranged to coincide with the position of the end 4Mb on the back side B side. And in diaper 1A, as shown in FIG. 3, the edge part 60a by the side of the stomach side A of the vertical direction (Y direction) of the indicator coating area | region 60 is the vertical direction (Y direction) of the main absorption area | region 4M. Arranged to coincide with the position of the end portion 4Ma on the ventral side A side.

  Further, when the diaper 1A is cross-sectionally viewed in the horizontal direction (X direction), the side portion 60s along the vertical direction (Y direction) of the indicator coating region 60 has a main absorption region 4M from the viewpoint of accurately recognizing the degree of urination. It is preferable to be arranged in the vicinity of the side portion 4Ms along the vertical direction (Y direction). In the diaper 1A shown in FIG. 2, the side part 60s of the indicator coating region 60 is not arranged near the side part 4Ms of the main absorption region 4M. The side portion 60s along the vertical direction (Y direction) of the indicator coating region 60 is arranged in the vicinity of the side portion 4Ms along the vertical direction (Y direction) of the main absorption region 4M. The side portion 60s is not only arranged to coincide with the position of the side portion 4Ms of the main absorption region 4M, but the side portion 60s of the indicator coating region 60 is in the vertical direction (Y direction) of the main absorption region 4M. The length in the horizontal direction (X direction) of the main absorption region 4M (based on the side edge of the side portion 4Ms along the side edge (the side edge of the side portion along the vertical direction (Y direction) of the upper absorber 42 in the diaper 1A)) In diaper 1A, it means that it should just be located in the range of about 10% of the length (the length of the horizontal direction (X direction) of the upper layer absorber 42). For example, in the diaper 1A, when the length in the horizontal direction (X direction) of the upper layer absorbent body 42 is 40 mm, the side portion 60s of the indicator coating region 60 has a side edge of the side portion of the upper layer absorbent body 42. This means that it should be arranged within a range of ± 4 mm as a reference.

In addition to the indicator coating region 60 shown in FIG. 1, the indicator coating region 60 may be arranged, for example, as shown in FIGS. 4 (a) to 4 (e). 4 (a) to 4 (e), when the absorbent article is viewed in plan, the indicator coating region 60 reaches the vicinity of the front and rear ends of the upper absorbent body 42 in the longitudinal direction (Y direction). In the direction (X direction), at least a part of the coating region 60 is applied to both side portions 60s and 60s of the upper absorber 42. Hereinafter, FIGS. 4A to 4E will be described in detail.
In FIG. 4A, the indicators 6 are coated in the vertical direction (Y direction) with a space therebetween to form a group of indicators 6 extending in one vertical direction (Y direction). An indicator coating area 60 surrounding the group is shown. Further, in FIG. 4B, the indicator 6 is continuously applied in the vertical direction (Y direction) to form one line, and the indicator coating surrounding the line of the single indicator 6 is formed. Region 60 is shown. The indicator coating region 60 shown in FIGS. 4A and 4B is arranged across the front and rear end edges in the longitudinal direction (Y direction) of the upper layer absorber 42, and the longitudinal direction of the indicator coating region 60 ( The end 60b on the back side B in the Y direction is arranged to coincide with the position of the end 4Mb on the back side B in the vertical direction (Y direction) of the main absorption region 4M. And the end part 60a on the ventral side A in the vertical direction (Y direction) of the indicator coating area 60 is the position of the end part 4Ma on the ventral part A side in the vertical direction (Y direction) of the main absorption area 4M. Matched.

  FIG. 4C shows a group of indicators 6 in which circular indicators 6 are applied in the vertical direction (Y direction) alternately with left and right intervals and extend in the vertical direction (Y direction). An indicator coating area 60 surrounding the group of indicators 6 is shown. In the indicator coating region 60 shown in FIG. 4C, the leftmost position of the left circular indicator 6 and the position of the side edge of the left side portion along the longitudinal direction (Y direction) of the upper layer absorber 42 are the same. In addition, the rightmost position of the right circular indicator 6 and the position of the right side edge along the longitudinal direction (Y direction) of the upper layer absorber 42 coincide with each other. Furthermore, the position of the tip in the most Y direction of the circular indicator 6 on the most back side B side and the position of the edge of the end on the back side B side in the longitudinal direction (Y direction) of the upper absorber 42 are determined. And the position of the lowermost end in the Y direction of the circular indicator 6 on the most ventral side A side and the position of the edge of the end on the ventral side A in the longitudinal direction (Y direction) of the upper layer absorber 42 Match. Therefore, the indicator coating area 60 shown in FIG. 4C matches the contour of the upper absorbent body 42 and coincides with the main absorbent area 4M of the absorbent body 4. As described above, the indicator coating area 60 shown in FIG. 4C is arranged such that the end 60b on the back side B side coincides with the position of the end 4Mb on the back side B of the main absorption area 4M. Then, the end 60a on the ventral side A side is arranged to coincide with the position of the end 4Ma on the ventral side A side of the main absorption region 4M. And the indicator coating area | region 60 shown in FIG.4 (c) is distribute | arranged so that the both sides 60s and 60s may correspond with the position of the both sides 4Ms and 4Ms of the main absorption area | region 4M.

  Further, in FIG. 4D, the indicator 6 composed of two lines is arranged at the diagonal line position of the upper-layer absorber 42, and the indicator coating region 60 surrounding the two indicators 6 is shown. Yes. Since the indicator coating area 60 shown in FIG. 4D is formed by arranging the lines of the two indicators 6 at the diagonal positions of the upper absorber 42 as described above, the indicator coating area 60 shown in FIG. The indicator coating area 60 shown is coincident with the contour of the upper-layer absorbent body 42 and coincides with the main absorbent area 4M of the absorbent body 4. As described above, the indicator coating region 60 shown in FIG. 4D is arranged such that the end 60b on the back side B side coincides with the position of the end 4Mb on the back side B of the main absorption region 4M. Then, the end 60a on the ventral side A side is arranged to coincide with the position of the end 4Ma on the ventral side A side of the main absorption region 4M. And the indicator coating area | region 60 shown in FIG.4 (d) is distribute | arranged so that both sides 60s and 60s may correspond with the position of the both sides 4Ms and 4Ms of the main absorption area | region 4M.

  FIG. 4E shows the positions of both side edges on both sides along the longitudinal direction (Y direction) of the upper-layer absorber 42 and the position of the center line CL extending in the longitudinal direction (Y-direction) of the upper-layer absorber 42. A line of three indicators 6 extending in the vertical direction (Y direction) is arranged along the lines, and an indicator coating area 60 surrounding the lines of the three indicators 6 is shown. In the indicator coating region 60 shown in FIG. 4 (e), the position of the line of the left indicator 6 coincides with the position of the side edge on the left side along the longitudinal direction (Y direction) of the upper-layer absorber 42, The position of the line of the indicator 6 coincides with the position of the side edge on the right side along the longitudinal direction (Y direction) of the upper layer absorber 42. Further, the lines of the three indicators 6 indicate the position of the tip in the Y direction on the most back side B and the edge of the end on the back side B in the longitudinal direction (Y direction) of the upper absorber 42. And the position of the lower end in the Y direction on the most ventral side A side and the position of the edge of the end on the ventral side A side in the longitudinal direction (Y direction) of the upper layer absorbent body 42 match. . Therefore, the indicator coating area 60 shown in FIG. 4 (e) matches the contour of the upper-layer absorber 42 and matches the main absorption area 4 </ b> M of the absorber 4. Thus, the indicator coating region 60 shown in FIG. 4 (e) is arranged such that the end 60b on the back side B side coincides with the position of the end 4Mb on the back side B of the main absorption region 4M. Then, the end 60a on the ventral side A side is arranged to coincide with the position of the end 4Ma on the ventral side A side of the main absorption region 4M. And the indicator coating area | region 60 shown in FIG.4 (e) is distribute | arranged so that the both sides 60s and 60s may correspond with the position of the both sides 4Ms and 4Ms of the main absorption area | region 4M.

The material for forming the diaper 1A of the present embodiment will be described.
As the top sheet 2 and the back sheet 3, as long as they are usually used for absorbent articles such as disposable diapers, they can be used without particular limitation. For example, a hydrophilic and liquid-permeable non-woven fabric can be used as the top sheet 2, and a liquid-impermeable or water-repellent resin film, a laminate of the resin film and the non-woven fabric can be used as the back sheet 3. Can be used. As the covering material 412 constituting the lower layer absorbent body 41, a hydrophilic sheet, for example, a core-wrap sheet made of a water-permeable thin paper (tissue paper) or a water-permeable nonwoven fabric can be used. As the side sheets 5 forming the three-dimensional gathers and the leg gathers, they can be used without particular limitation as long as they are usually used in absorbent articles such as disposable diapers. Those laminated sheets can be used.

  The elastic member 51 for forming a three-dimensional gather and the elastic member 52 for forming a leg gather can be used without particular limitation as long as they are usually used for absorbent articles such as disposable diapers. For example, a thread-like stretchable material made of natural rubber, polyurethane, polystyrene-polyisoprene copolymer, polystyrene-polybutadiene copolymer, polyethylene-α olefin copolymer such as ethyl acrylate-ethylene, or the like can be used.

  The indicator 6 can be used without particular limitation as long as it is normally used for absorbent articles such as disposable diapers. For example, a sheet material such as a film or non-woven fabric different from the back sheet 3 or a sheet material coated with a color material that develops, discolors, or decolors by contacting the back sheet 3 directly with excrement can be used. For example, as the color material, a mixture of a pH indicator and an oxidation compound can be used.

  Examples of the stretchable panel 7b include (1) a sheet in which fiber layers that can be stretched on both sides or one side of an elastic fiber layer are integrated, and (2) a fiber layer that can be stretched on both sides or one side of a net-like elastic sheet. And (3) a sheet in which a stretchable fiber layer is integrated on both sides or one side of an elastic sheet made of an elastic film. If the panel material 6a is normally used for absorbent articles, such as a disposable diaper, it can use without a restriction | limiting especially, For example, a liquid-impermeable nonwoven fabric etc. can be used. If the fastening tape 72 is normally used for absorbent articles, such as a disposable diaper, it can be especially used without a restriction | limiting. For example, as the fastening part 71 of the fastening tape 72, “Magic tape (registered trademark)” (manufactured by Kuraray Co., Ltd.), “Quicklon (registered trademark)” (manufactured by YKK), “Majikuros (registered trademark)” (Kanebo) The male member etc. in the bell touch company etc. can be used.

  For fixing the top sheet 2, the back sheet 3, the side sheet 5, the fastening tape 72, etc., a hot melt adhesive, heat embossing, ultrasonic embossing, high frequency embossing, etc., which are usually used for absorbent articles such as disposable diapers, etc. A fusing means is used.

The effect at the time of using the disposable diaper 1A of embodiment of this invention mentioned above is demonstrated.
As shown in FIGS. 1 and 2, the diaper 1 </ b> A has a lower layer absorbent body 41 extending from the abdominal side part A to the dorsal side part B, and an abdominal side part A disposed on the skin facing surface of the lower layer absorbent body 41. The upper layer absorbent body 42 is provided with the absorbent body 4 composed of the upper layer absorbent body 42 extending only in C, and the upper layer absorbent body 42 has a smaller basis weight of the absorbent polymer than the lower layer absorbent body 41. Therefore, the upper layer absorber 42 has a structure in which urine is easily diffused. And the lower layer absorber 41 has the absorption weight of the region belonging to the sub absorption region 4E other than the main absorption region 4M in which the basis weight of the absorption polymer in the region belonging to the main absorption region 4M where the upper layer absorber 42 and the lower layer absorber 41 overlap. Since it is larger than the basis weight of the polymer, urine that has migrated from the upper-layer absorber 42 is easily held mainly in the main absorption region 4M. Further, as shown in FIG. 3, when the diaper 1 is viewed in a cross section in the longitudinal direction (Y direction), the indicator coating region 60 is disposed in the main absorption region 4M, and the back side portion B of the indicator coating region 60 The end 60b on the side is arranged in the vicinity of the end 4Mb on the back side B of the main absorption region 4M. Therefore, the indicator 6 in the indicator coating area 60 is likely to be accurately discolored mainly by urine held mainly in the main absorption area 4M, and the accuracy of the replacement time of the diaper 1A is improved. Thus, since the accuracy of the replacement time is improved in the diaper 1A, according to the diaper 1A, it is difficult for urine to leak out from the crotch part C.

  Moreover, in the diaper 1A, as shown in FIG. 3, the end 60a on the ventral side A side in the vertical direction (Y direction) of the indicator coating region 60 is in the vertical direction (Y direction) of the main absorption region 4M. Arranged in the vicinity of the end 4Ma on the ventral side A side. Therefore, since it is possible to confirm at a glance that urine has been absorbed up to the end of the main absorption region 4M, the accuracy of the replacement time is further improved.

  In particular, in the diaper 1A, as shown in FIG. 3, the indicator coating region 60 has an end 60b on the back side B side of the same position as the end 4Mb on the back side B of the main absorption region 4M. The end 60a on the ventral side A side of the main absorption region 4M is aligned with the position of the end 4Ma on the ventral side A of the main absorption region 4M. Therefore, the indicator 6 in the indicator coating area 60 is more likely to be discolored more accurately due to urine mainly held in the main absorption area 4M, and the accuracy of changing the diaper 1A is further improved.

Next, a pants-type disposable diaper 1B (hereinafter also referred to as “diaper 1B”) that is a second embodiment of the present invention will be described with reference to FIGS. 5 and 6.
About the diaper 1B of 2nd Embodiment, a different point from the diaper 1A of 1st Embodiment is demonstrated. The point which is not demonstrated especially is the same as that of the diaper 1A, and description of the diaper 1A is applied suitably.

  As shown in FIGS. 5 and 6, the diaper 1 </ b> B has a hydrophilic sublayer sheet 8 that is harder to be compressed (lower compression work amount) than the upper absorbent body 42 between the absorbent body 4 and the top sheet 2. It is arranged. The sublayer sheet 8 of the diaper 1B has a rectangular shape in plan view, and the length in the horizontal direction (X direction) is equal to the length in the horizontal direction (X direction) of the upper absorber 42 as shown in FIG. The length in the vertical direction (Y direction) is the same as the length in the vertical direction (Y direction) of the upper-layer absorber 42. That is, the sublayer 42 of the diaper 1B is disposed and fixed on the skin facing surface of the upper absorbent body 42 of the absorbent body 44 as shown in FIG. 6, and is disposed only from the ventral side A to the crotch C. It is not arranged on the back side B.

The sublayer sheet 8 preferably has a basis weight of 10 g / m ² or more and 100 g / m ² or less. As the sublayer sheet 8, a sheet mainly composed of hydrophilic fibers (sheet having a hydrophilic fiber content of preferably 90% by mass or more) can be used. Examples of the sheet include paper, nonwoven fabric, and web. In particular, nonwoven fabrics such as air-through and resin bonds are preferred. The hydrophilic fiber can be used without particular limitation as long as it is a fiber having a hydrophilic surface and can form a sheet in which the fibers have a high degree of freedom in the wet state. Polyethylene, polypropylene, polyethylene terephthalate, or composite fibers thereof can be used. The sublayer sheet 8 may contain other components such as a water-absorbing polymer and a deodorant in addition to the hydrophilic fiber.

The compression work of the sublayer sheet 8 is preferably 50 g · cm / cm ² or more, more preferably 100 g · cm / cm ² or more, and preferably 500 g · cm / cm ² or less, more preferably 400 g · cm / cm ² or less, specifically, 50 g · cm / cm ² or more and preferably 500 g · cm / cm ² or less, preferably 100 g · cm / cm ² or more and 400 g · cm / cm ² or less. More preferably it is. The lower layer absorber 41 preferably has a compression work of 200 g · cm / cm ² or more, more preferably 300 g · cm / cm ² or more, and preferably 1200 g · cm / cm ² or less, more preferably 900 g · cm / cm ² or less, specifically 200 g · cm / cm ² or more and preferably 1200 g · cm / cm ² or less, more preferably 300 g · cm / cm ² or more and 900 g · cm / cm ² or less. More preferably it is. The upper layer absorber 42 preferably has a compression work of 300 g · cm / cm ² or more, more preferably 400 g · cm / cm ² or more, and preferably 1200 g · cm / cm ² or less, more preferably 800 g · cm / cm ² or less, specifically 300 g · cm / cm ² or more and 1200 g · cm / cm ² or less, preferably 400 g · cm / cm ² or more and 800 g · cm / cm ² or less. More preferably it is. In particular, the compression work of the sublayer sheet 8 is preferably 50 g · cm / cm ² or more higher than the compression work of the upper-layer absorber 42 from the viewpoint of improving the diffusibility at the time of pressurization, More preferably, it is higher than cm / cm ² . The compression work is measured by the following method. The higher the value of the compression work, the easier it is to be compressed (easy to be crushed), and the lower the value is, the harder it is to compress (hard to be crushed).

<Measurement method of compression work>
The compression work is measured by using a KES-FB3-AUTO-A compression tester manufactured by Kato Tech Co., Ltd. and measuring the compression work of the sample: WC value (unit: g · cm / c ² ). Is required. The measurement conditions are compression deformation rate: 0.10 mm / sec and compression maximum load condition: 50 gf / cm ² . When the object to be measured is a fiber pile of cellulose fiber or polymer and they are in a form that is difficult to measure because they are not covered with a coating material, a span with a basis weight of 10 g / m ^{2 to} 30 g / m ² A sample piece may be formed by coating with a bond nonwoven fabric. Different points of the sample piece are measured three times, and the average value is defined as the compression work (g · cm / cm ² ).

The effect at the time of using the diaper 1B of 2nd Embodiment of this invention mentioned above is demonstrated.
About the effect of the diaper 1B of 2nd Embodiment, a different point from the effect of the diaper 1A of 1st Embodiment is demonstrated. The point which is not demonstrated especially is the same as that of the effect of diaper 1A, and description of the effect of diaper 1A is applied suitably.

  As shown in FIGS. 5 and 6, the diaper 1 </ b> B is hydrophilic between the absorbent body 4 and the top sheet 2, having a smaller compression work than the upper absorbent body 42, that is, difficult to be compressed (low compression work). Sex sub-layer sheet 8 is arranged. Therefore, it is possible to reinforce the urine absorption ability and reduce the phenomenon (wet back) in which the absorbed urine returns to the surface sheet 2 side. In particular, in the diaper 1B, as shown in FIGS. 5 and 6, since the sublayer 42 is disposed only from the ventral side A to the crotch C, it is mainly held in the main absorption region 4M. Although the urine absorbability of urine can be reinforced, since it is not arranged on the back side portion B, it is difficult to affect the discoloration of the indicator 6 in the indicator coating region 60.

  The absorbent article of the present invention is not limited to the diaper 1A of the first embodiment described above and the diaper 1B of the second embodiment described above, and can be appropriately changed. Moreover, each component in the diaper 1A-1B of the above-mentioned 1st-2nd embodiment can be implemented suitably combining in the range which does not impair the meaning of this invention.

  For example, the absorbent article of the present invention may be a pants-type disposable diaper other than the unfolded disposable diaper such as the above-described diapers 1A and 1B. It may be a pad or the like.

  The following absorbent articles are disclosed regarding the embodiment described above.

<1>
It is provided with a top sheet disposed on the skin facing surface side, a back sheet disposed on the non-skin facing surface side, and an absorber disposed between these two sheets, on the abdominal side, back side, and crotch The absorbent body has a vertically divided absorbent body, and the absorbent body is provided with an indicator coating area on which an indicator for indicating excretion by a color change is vertically disposed between the back sheet and the absorbent body. An absorbent article arranged in a direction,
The absorber comprises a lower layer absorber extending from the abdominal side portion to the back side portion, and an upper layer absorber extending from the abdominal side portion to the crotch portion disposed on the skin facing surface of the lower layer absorber. The absorber is divided into a main absorption region where the upper layer absorber and the lower layer absorber overlap, and a sub absorption region other than the main absorption region in plan view,
The absorbent includes an absorbent polymer and cellulose fibers,
In the lower layer absorbent, the basis weight of the absorbent polymer in the region belonging to the main absorption region is larger than the basis weight of the absorption polymer in the region belonging to the sub absorption region,
The upper layer absorbent has a basis weight of the absorbent polymer smaller than a basis weight of the absorbent polymer of the lower layer absorbent, or does not include the absorbent polymer,
In plan view of the absorbent article, the indicator coating area is disposed in the main absorption area, and the end on the back side in the vertical direction of the indicator coating area is the vertical direction of the main absorption area. Absorbent article arranged near the end on the back side of the direction.

<2>
The absorbent article according to <1>, wherein an end on the ventral side in the vertical direction of the indicator coating region is disposed near an end on the ventral side in the vertical direction of the main absorption region.
<3>
The length of the main absorption region in the vertical direction is based on the edge of the vertical side of the main absorption region on the back side in the vertical direction of the indicator coating region. The absorbent article according to <1> or <2>, which is located within a range of about 10% of the above.
<4>
The length of the main absorption region in the vertical direction is based on the edge of the end portion on the ventral side in the vertical direction of the main absorption region. The absorbent article according to any one of <1> to <3>, which is located within a range of about 10% of the above.
<5>
In the indicator coating area, a single indicator line is arranged along the longitudinal front and rear edges of the upper absorbent body along the position of the center line extending in the vertical direction. Two indicator lines extending in parallel with the center line in the longitudinal direction between the line and each side edge on both sides along the longitudinal direction of the upper absorbent body are the longitudinal front and rear edges of the upper absorbent body The absorbent article according to any one of <1> to <4>, wherein the absorbent article is disposed over a wide area.
<6>
The indicator coating region is disposed across the longitudinal front and rear edges of the upper layer absorbent body, and the end on the back side in the longitudinal direction of the indicator coating region is the longitudinal axis of the main absorbent region. The end on the ventral side in the vertical direction of the indicator coating area is arranged on the ventral side in the vertical direction of the main absorption area. The absorbent article according to any one of <1> to <5>, wherein the absorbent article is disposed so as to coincide with a position of an end of the item.
<7>
The absorbent article according to any one of <1> to <6>, wherein the cellulose fibers of the upper-layer absorbent body are crosslinked cellulose fibers.
<8>
Any one of <1> to <7>, wherein a hydrophilic sublayer sheet having a lower compression work than the upper absorbent body (hard to be compressed) is disposed between the absorbent body and the top sheet. 2. The absorbent article according to 1.
<9>
The sub-layer sheet has a rectangular shape in plan view, is disposed and fixed on the skin-facing surface of the upper absorbent body of the absorbent body, and is disposed only from the ventral side to the crotch, The absorbent article according to <8>, wherein the absorbent article is not disposed on a side portion.
<10>
The sublayer sheet is an absorbent article according to <8> or <9>, wherein the basis weight is 10 g / m ² or more and 100 g / m ² or less.
<11>
The sublayer sheet is a sheet mainly composed of hydrophilic fibers, the content of the hydrophilic fibers is a sheet of 90% by mass or more, and the sheet is any one of paper, nonwoven fabric, and web. The absorbent article according to any one of 8> to <10>.
<12>
The sublayer sheet has a compression work of 50 g · cm / cm ² or more and 500 g · cm / cm ² or less, preferably 100 g · cm / cm ² or more and 400 g · cm / cm ² or less <8 The absorbent article according to any one of> to <11>.

<13>
The lower layer absorbent body is formed by wrapping a lower layer absorbent core with a covering material,
The said covering material is an absorbent article in any one of said <1>-<12> whose liquid permeability is lower than the liquid permeability of the said upper layer absorber.
<14>
When the absorbent article is viewed in plan, the indicator coating region reaches the vicinity of the front and rear ends of the upper layer absorber in the longitudinal direction, and at least a part of the coating region in both sides of the upper layer absorber in the lateral direction. The absorbent article according to any one of <1> to <13>, wherein the absorbent article is coated up to a portion.
<15>
The indicator coating area is formed of a group of indicators in which circular indicators are applied alternately at left and right intervals in the vertical direction to extend in the vertical direction, and the indicator coating area is on the side in the width direction. The position of one side of the circular indicator of the same and the position of the side edge of one side along the longitudinal direction of the upper layer absorber coincide with each other, the position of the other side of the circular indicator on the other side in the width direction and the upper layer The position of the side edge of the other side portion along the longitudinal direction of the absorber coincides with the position of the most distal end of the circular indicator on the most back side and the back side in the longitudinal direction of the upper layer absorber The position of the edge of the upper end of the upper absorbent body and the position of the edge of the upper side of the upper absorbent body in the longitudinal direction The absorbent article according to <14>, wherein the two match.
<16>
The absorbent article according to <14>, wherein the indicator coating area is an area surrounding the two indicators, in which an indicator composed of two lines is arranged at a diagonal position of the upper-layer absorber.
<17>
The indicator coating region includes three pieces extending in the vertical direction along the positions of both side edges on both sides along the vertical direction of the upper layer absorber and the position of the center line extending in the vertical direction of the upper layer absorber. An indicator line is arranged, and an area surrounding the three indicator lines is the indicator coating area, and the indicator coating area includes the position of the indicator line on one side and the vertical direction of the upper absorbent body. The position of the side edge on one side along the direction matches, the position of the indicator line on the other side matches the position of the side edge on the other side along the vertical direction of the upper-layer absorber, and three more The indicator line of the topmost side corresponds to the position of the end on the back side in the longitudinal direction of the upper absorbent body, and the position of the bottom end on the side of the most ventral side. And the position of the edge of the end on the ventral side in the longitudinal direction of the upper layer absorber The absorbent article according to coincident with that the <14>.
<18>
The upper layer absorbent body is formed only from the upper layer absorbent core,
The absorbent article according to any one of <1> to <17>, wherein the basis weight of the upper absorbent core is 50 g / m ² or more and 500 g / m ² or less.
<19>
The lower-layer absorbent body is formed by using a single coating material, folding back both sides of the coating material, and connecting the side edges of the coating material to the non-skin facing surface side (back sheet side) of the lower-layer absorbent core. The absorbent article according to any one of <1> to <18>, wherein the absorbent article is formed so as to wrap around the lower absorbent core.
<20>
The basis weight of the lower layer absorbent core is 100 g / m ² or more and 1000 g / m ² or less, and the basis weight of the coating material is 3 g / m ² or more and 20 g / m ² or less. Absorbent article.

<21>
The basis weight of the absorbent polymer in the region belonging to the main absorbent region in the lower layer absorbent core is 50 g / m ² or more and 500 g / m ² or less, preferably 100 g / m ² or more and 400 g / m ² or less. The basis weight of the cellulose fiber in the region belonging to the main absorbent region in the lower layer absorbent core is 0 g / m ² or more and 300 g / m ² or less, preferably 0 g / m ² or more and 200 g / m ² or less. The absorptive article given in the above <19> or <20>.
<22>
The basis weight of the absorbent polymer in the region belonging to the sub-absorbent region in the lower layer absorbent core is 20 g / m ² or more and 400 g / m ² or less, preferably 50 g / m ² or more and 300 g / m ² or less, The basis weight of the cellulose fiber in the region belonging to the sub-absorbing region in the lower absorbent core is 0 g / m ² or more and 250 g / m ² or less, preferably 0 g / m ² or more and 200 g / m ² or less. The absorbent article according to any one of <19> to <21>.
<23>
The basis weight of the absorbent polymer in the region belonging to the main absorbent region in the lower absorbent core is 10 g / m ² or more larger than the basis weight of the absorbent polymer in the region belonging to the sub absorbent region in the lower absorbent core. The absorbent article according to any one of <19> to <22>, preferably 20 g / m ² or more.
<24>
Any of the above <1> to <23>, wherein the absorption polymer contained in the absorber has a water absorption of 10 g / g or more and 50 g / g or less, preferably 15 g / g or more and 30 g / g or less. 2. The absorbent article according to 1.
<25>
Any of the above <1> to <24>, wherein the absorption polymer under pressure at 2.0 kPa is 10 g / g or more and 50 g / g or less, preferably 15 g / g or more and 30 g / g or less. 2. The absorbent article according to 1.
<26>
Any one of the above items <1> to <25>, wherein the absorbing polymer has a liquid flow rate under a pressure of 2.0 kPa of 5 ml / min to 150 ml / min and 10 ml / min to 120 ml / min. Absorbent article as described in 1.
<27>
The absorption rate of the absorption polymer measured according to the DW method is 10 ml / (g · 10 minutes) to 100 ml / (g · 10 minutes), preferably 20 ml / (g · 10 minutes) to 70 ml / ( g · 10 minutes) The absorbent article according to any one of the above items <1> to <26>.
<28>
The absorption rate of the absorption polymer measured according to the DW method is 3 ml / (g · 1 minute) to 30 ml / (g · 1 minute), preferably 5 ml / (g · 1 minute) to 20 ml / ( g · 1 minute) The absorbent article according to any one of the above items <1> to <27>.
<29>
The absorbent polymer can absorb and retain a liquid 20 times or more of its own weight, and can gel, and has an average particle diameter of 10 μm or more and 1000 μm or less, preferably 100 μm or more and 800 μm or less. The absorbent article according to any one of <1> to <28>, wherein the shape of the particles is any of various shapes such as a spherical shape, a lump shape, a grape shape, and a bowl shape.

<30>
The coating material constituting the lower layer absorber has a liquid permeation time that is 5 seconds or more slower than the liquid permeation time of the upper layer absorber, and preferably any one of the above <1> to <29> An absorbent article as described above.
<31>
The covering material constituting the lower layer absorbent is a hydrophilic sheet, and the hydrophilic sheet is a core wrap sheet made of water-permeable thin paper (tissue paper) or water-permeable nonwoven fabric. <1> to <30 > Any one of>.
<32>
The upper absorbent core that forms the upper absorbent body and the lower absorbent core that forms the lower absorbent absorbent body are rectangular, and the upper absorbent core is shorter in the longitudinal direction than the lower absorbent core, And the length of the width direction is short, The absorbent article in any one of said <1>-<31>.
<33>
The upper absorbent core that forms the upper absorbent body has a rectangular shape, the lower absorbent core that forms the lower absorbent body has a shape constricted at the crotch, and the upper absorbent core is more than the lower absorbent core. The length in the vertical direction is short, and the length in the width direction is the same in the upper layer absorbent core and the lower layer absorbent core in the crotch part, and the absorbency according to any one of <1> to <31> Goods.
<34>
As the top sheet, a hydrophilic and liquid-permeable nonwoven fabric is used, and as the back sheet, a liquid-impermeable or water-repellent resin film or a laminate of the resin film and the nonwoven fabric is used. The absorbent article according to any one of <33>.
<35>
The absorbent article according to any one of <1> to <34>, wherein the absorbent article is a disposable diaper.
<36>
The disposable diaper is an unfolded disposable diaper, and the disposable diaper according to the above <35>, which has a leg gather and a three-dimensional gather.

1A, 1B Unfoldable disposable diaper 10 Absorbent body 10s Side part 2 along the longitudinal direction (Y direction) of the absorbent body 10 Top sheet 3 Back sheet 4 Absorber 41 Lower layer absorber 411 Lower layer absorbent core 412 Covering material 42 Upper layer absorbent body 421 Upper layer absorbent body 4M Main absorbent region 4Ma End portion on the abdominal side A side in the longitudinal direction (Y direction) of the main absorbent region 4M 4Mb Back side portion B side in the longitudinal direction (Y direction) of the main absorbent region 4M 4Ms Side portions along the longitudinal direction (Y direction) of the main absorption region 4M 4E Sub absorption region 5 Side sheet 51 Elastic member for forming three-dimensional gathers 52 Elastic member for forming leg gathers 6 Indicator 61 Indicator 62 Indicator 60 Indicator Application region 60a End portion 60 on the ventral side A in the vertical direction (Y direction) of the indicator application region 60 b End portion 60s in the vertical direction (Y direction) of the indicator coating region 60 on the back side B side Side portion 7a along the vertical direction (Y direction) of the indicator coating region 60 Panel material 7b Expandable panel 71 Fastening portion 72 Fastening tape 73 Landing tape 8 Sublayer sheet A Abdominal side, B Dorsal side, C Inseam CL Centerline extending in the vertical direction of the diaper

Claims (8)

It is provided with a top sheet disposed on the skin facing surface side, a back sheet disposed on the non-skin facing surface side, and an absorber disposed between these two sheets, on the abdominal side, back side, and crotch The absorbent body has a vertically divided absorbent body, and the absorbent body is provided with an indicator coating area on which an indicator for indicating excretion by a color change is vertically disposed between the back sheet and the absorbent body. An absorbent article arranged in a direction,
The absorber comprises: a lower layer absorber extending from the abdominal side portion to the back side portion; and an upper layer absorber extending only from the abdominal side portion to the crotch portion disposed on the skin facing surface of the lower layer absorber. And the absorber is divided into a main absorption region where the upper layer absorber and the lower layer absorber overlap, and a sub absorption region other than the main absorption region,
The absorbent includes an absorbent polymer and cellulose fibers,
In the lower layer absorbent, the basis weight of the absorbent polymer in the region belonging to the main absorption region is larger than the basis weight of the absorption polymer in the region belonging to the sub absorption region,
The upper layer absorbent has a basis weight of the absorbent polymer smaller than a basis weight of the absorbent polymer of the lower layer absorbent, or does not include the absorbent polymer,
In plan view of the absorbent article, the indicator coating area is disposed in the main absorption area, and the end on the back side in the vertical direction of the indicator coating area is the vertical direction of the main absorption area. Absorbent article arranged near the end on the back side of the direction.   The absorbent article according to claim 1, wherein an end portion on the ventral side portion in the longitudinal direction of the indicator coating region is disposed near an end portion on the ventral side portion side in the longitudinal direction of the main absorption region.   The absorbent article according to claim 1 or 2, wherein the cellulose fibers of the upper layer absorbent are crosslinked cellulose fibers.   The absorbent article according to any one of claims 1 to 3, wherein a hydrophilic sublayer sheet having a lower work of compression than the upper-layer absorbent body is disposed between the absorbent body and the top sheet. . The lower layer absorbent body is formed by wrapping a lower layer absorbent core with a covering material,
The absorbent article according to any one of claims 1 to 4, wherein the coating material has lower liquid permeability than the liquid permeability of the upper-layer absorber.   When the absorbent article is viewed in plan, the indicator coating region reaches the vicinity of the front and rear ends of the upper layer absorber in the longitudinal direction, and at least a part of the coating region in both sides of the upper layer absorber in the lateral direction. The absorbent article according to any one of claims 1 to 5, wherein the absorbent article is coated up to a part.   The upper absorbent core that forms the upper absorbent body and the lower absorbent core that forms the lower absorbent absorbent body are rectangular, and the upper absorbent core is shorter in the longitudinal direction than the lower absorbent core, And the length of the width direction is short, The absorbent article of any one of Claims 1-6.   The upper absorbent core that forms the upper absorbent body has a rectangular shape, the lower absorbent core that forms the lower absorbent body has a shape constricted at the crotch, and the upper absorbent core is more than the lower absorbent core. The absorbent article according to any one of claims 1 to 6, wherein the length in the longitudinal direction is short and the length in the width direction is equal between the upper absorbent core and the lower absorbent core in the crotch part.

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