TW201422213A - Absorbent article - Google Patents

Abstract

This diaper (1A) has an indicator-coating region (60) in which an indicator (6) has been coated arranged between a reverse surface sheet (3) and an absorbent body (4). The absorbent body (4) is composed of a lower layer absorbent body (41) that extends the entire length of the diaper (1A) and an upper layer absorbent body (42) that extends from an abdomen-side part (A)to only a crotch lower part (C), and is divided into: a main absorbing region (4M) on which the upper layer absorbent body (42) and the lower layer absorbent body (41) are superimposed; and a sub absorbing region (4E) that is not part thereof. The basis weight of the absorbent polymer of the lower layer absorbent body (41) is greater in the main absorbent region (4M) than in the sub absorbing region (4E). The basis weight of the absorbent polymer of the upper layer absorbent body (42) is less than that of the lower layer absorbent body (41). The indicator-coating region (60) is arranged in the main absorbing region (4M), and an end part (60b) on a backside part (B) side of the indicator-coating region (60) is near the end part (4Mb) on the backside part (B) of the main absorbing region (4M).

Description

Absorbent article

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

Previously, a disposable diaper having an indicator for judging whether or not a wearer has excreted based on color has been known. As a disposable diaper having an indicator, for example, the applicant has previously proposed a disposable diaper comprising a skin-side absorbent body on the side of the wearer's skin and a non-skin side absorbent body on the non-skin side of the wearer. Further, an indicator agent that visually changes by contact with a liquid is provided between the non-skin side absorbent body and the back surface sheet on the non-skin contact surface side (see Patent Document 1). The disposable diaper described in Patent Document 1 is a person who can easily recognize the replacement period based on the discoloration caused by the urination excreted or the like.

Conventionally, in order to enhance the appearance of an absorbent article, a print design such as a pattern, a letter, a number, or a character is printed on a specific portion of the absorbent article. For example, Patent Document 2 discloses a disposable diaper which is a fashionable disposable diaper for children, and a disposable diaper in which a pattern of a coat, such as a design, a picture, or a photograph, is printed on the back sheet.

Further, a disposable diaper having a function of notifying the replacement period when it is wet due to urination or the like is known. For example, Patent Document 3 describes that a hydrophilic agent (indicator) that is visually changed by contact with moisture is provided between the absorber and the back sheet, and the back sheet is The portion of the diaper that is not overlapped with the hydrophilic agent in the thickness direction is similar to any color after the contact with the moisture does not change visually and before the hydrophilic agent changes visually. Patterns of similar colors. According to Patent Document 3, an instruction to notify the replacement period according to the discoloration In addition to the agent, a pattern of a similar color of the color before or after the change of the indicator is applied at a position separated from the indicator in the width direction of the diaper, whereby the observer (the diaper wearer is an infant) In the case of the mother, etc., the discoloration of the indicator is effectively discriminated, and Patent Document 3 suggests that the indicator and the pattern do not overlap in the thickness direction of the diaper, and the importance of improving the discrimination of the indicator is emphasized.

Prior technical literature Patent literature

Patent Document 1: Japanese Patent Laid-Open Publication No. 2011-240049

Patent Document 2: Japanese Patent Laid-Open Publication No. 2010-508116

Patent Document 3: Japanese Patent Laid-Open Publication No. 2004-337385

Generally, an absorbent article such as a disposable diaper is, for example, a higher ratio of absorption and urination from the lower part of the diaper to the ventral side of the urinary tract, and conversely, urinating is less likely to spread to the back side farther from the urinary tract. Here, the disposable diaper-type skin-side absorbent body and the non-skin-side absorbent body described in Patent Document 1 are disposed from the abdominal side portion to the back side portion, and the indicator is also disposed from the abdominal side portion to the back side portion. Therefore, there is a case where the portion of the indicator disposed on the side of the back side at the time of urination is difficult to be discolored. If the change of the discoloration of the portion is not performed as an index, the urinary leakage from the underarm portion may occur. There is room for improvement in accuracy. In addition, in the case of the above-described effects, how to arrange the skin-side absorbent body and the non-skin-side absorbent body, and how to arrange them and the like, are not described.

Therefore, the present invention (first invention) relates to the provision of an absorbent article which satisfies the above requirements.

In the case where the diaper having the indicator agent has been worn, there is a case where the indicator discolors by contact with the body fluid such as urine, and the observer does not recognize the discoloration, and misses the replacement period, and the previous indication is given. The diaper of the agent is attached to the visual of the indicator There is room for improvement in the aspect of the discriminating change. An absorbent article which is improved in appearance by performing a print design and which is easy to recognize the visual change of the indicator from the outside has not been provided.

Therefore, the present invention (second invention) relates to an absorbent article which is excellent in appearance and is easily distinguishable from the outside in visual change of the indicator.

According to a first aspect of the invention, there is provided an absorbent article comprising a vertically long absorbent body comprising a front sheet disposed on a facing side of the skin and disposed on a non-skin facing surface a back sheet and a absorber disposed between the two sheets, and are divided into a belly portion, a back portion, and a crotch portion, and the absorbent body is between the back sheet and the absorber An indicator application region coated with an indicator for notifying the excretion according to a change in color is disposed in the longitudinal direction. The above absorbent body comprises an absorbent polymer and cellulose fibers. The absorbing system includes an absorbent body from the ventral side portion over the back side portion and an upper layer absorbing body disposed on the skin opposing surface of the lower layer absorbing body. The main absorption region in which the upper layer absorber overlaps the lower layer absorber and the secondary absorption region other than the main absorption region when the absorber is viewed in plan. The basis weight of the above-mentioned absorbing polymer in the region of the lower absorption body belonging to the main absorption region is larger than the basis of the absorbing polymer in the region belonging to the secondary absorption region. The basis weight of the absorbing polymer of the upper layer absorber is smaller than the basis weight of the absorbing polymer of the lower layer absorber, or the upper layer absorber does not contain the absorbing polymer. When the absorbent article is viewed from above, the indicator application region is disposed in the main absorption region, and an end portion on the back side portion side of the longitudinal direction of the indicator application region is disposed on the back side portion side of the longitudinal direction of the main absorption region. Near the end.

According to a second aspect of the invention, there is provided an absorbent article comprising: an absorbent body; and a back sheet disposed on the non-skin opposing side of the absorbent body, having a longitudinal direction corresponding to the wearer's front and rear directions and being positive thereto In the longitudinal direction, the front side of the wearer's ventral side, the lower part of the crotch portion, and the back side portion disposed on the back side are included in the longitudinal direction. The back sheet has a laminated structure of a moisture permeable sheet and a non-woven fabric, and is in the above-mentioned crotch portion. An indicator for discoloration by contact with moisture or body fluid is disposed between the back sheet and the absorber, and the color of the indicator before and after discoloration is different from the natural color of the moisture permeable sheet and the nonwoven fabric. In the moisture permeable sheet, the indicator corresponding region overlapping the indicator in the thickness direction of the absorbent article is printed with the indicator in a plurality of square shapes in a square shape of 1 cm square. The color after the discoloration is a design element of the same color or similar color, and a plurality of the design elements are respectively surrounded by the non-printing portion that is not printed. Setting any one of the plurality of design elements in the indicator corresponding region as a specific design element, setting one of the positions closest to the specific design element to be the closest design element, and drawing one through the In the case of a specific design element and an imaginary line closest to the center of each of the design elements, the length L1 of the overlapping portion of the imaginary line with the specific design element and the overlap with the closest design element in the imaginary line The length L2 of the portion is equal to or longer than the length L3 of the overlapping portion of the imaginary straight line with the non-printing portion sandwiched by the specific design element and the closest design element.

1A‧‧‧ diapers

1a‧‧‧End

1B‧‧‧ diapers

1C‧‧‧ diapers

1c‧‧‧ end

2‧‧‧Front sheet

3‧‧‧Back sheet

4‧‧‧Acceptor

4E‧‧‧ absorption area

4M‧‧‧Main absorption area

4Ma‧‧‧End

4Mb‧‧‧ end

4Ms‧‧‧ side

5‧‧‧Side sheet

6‧‧‧ indicator

7‧‧‧Three-dimensional protection

7a‧‧‧Sheet

7b‧‧‧Flexible film

8‧‧‧Secondary sheet

9‧‧‧Fixed area

10‧‧‧Absorbable ontology

10s‧‧‧ side

11‧‧‧Discoloration Department

15‧‧‧ mark

30‧‧‧ moisture permeable sheet

30A‧‧‧ indicator corresponding area

31‧‧‧ Non-woven

35‧‧‧Design elements

35a‧‧‧Specific design elements

35b‧‧‧ closest design elements

36‧‧‧No printing department

40‧‧‧Absorbable core

41‧‧‧lower absorber

41a‧‧‧1st package of chip

41b‧‧‧2nd package of chip

42‧‧‧Upper absorber

51‧‧‧Elastic members for the formation of three-dimensional pleats

52‧‧‧Elastic members for the formation of leg folds

60‧‧‧ indicator coating area

60a‧‧‧End

60b‧‧‧End

60s‧‧‧ side

61‧‧‧Line of indicator 6

62‧‧‧Line of indicator 6

71‧‧‧ Fixture

72‧‧‧Buckle belt

73‧‧‧ buckle belt

91‧‧‧Cylinder

92‧‧‧Cylinder

93‧‧‧ fixture

94‧‧‧Washers

411‧‧‧lower absorbent core

412‧‧‧Covered timber

421‧‧‧Upper absorbent core

A‧‧‧ ventral side

B‧‧‧Back side

C‧‧‧胯下下

CL‧‧‧ center line

L‧‧‧ imaginary straight line

L1‧‧‧ length

L2‧‧‧ length

L3‧‧‧ length

W‧‧‧ artificial urine

X‧‧‧ Landscape

Y‧‧‧ portrait

Fig. 1 is a partial broken plan view of the unfolded diaper of the first embodiment of the present invention (first invention) as seen from the front sheet side.

Figure 2 is a cross-sectional view taken along line I-I of Figure 1.

Figure 3 is a cross-sectional view taken along line II-II of Figure 1.

4(a) to 4(e) are views for explaining another embodiment of the indicator application region provided in the disposable diaper.

Fig. 5 is a cross-sectional view (corresponding to Fig. 2) of a lower portion of the unfolded diaper of the second embodiment of the present invention (first invention).

Fig. 6 is a longitudinal cross-sectional view (corresponding to Fig. 3) of the unfolded disposable diaper according to the second embodiment of the present invention (first invention).

Fig. 7 is a view showing the apparatus used in the method for measuring the liquid permeation time.

FIG. 8 is a view showing a back sheet side in which a stretched diaper according to an embodiment of the absorbent article according to the present invention (the second invention) is stretched to expand in a planar shape (non-skin contrast) Partially fractured plan view of one side.

Fig. 9 is a cross-sectional view schematically showing a cross section taken along line I-I of Fig. 8.

Figure 10 is a plan view schematically showing a portion of the indicator corresponding region of the moisture-permeable sheet in the diaper shown in Figure 8, and Figure 10 (a) is a plan view of the pattern before the indicator is discolored, Figure 10 (b) ) is a schematic plan view of the indicator after discoloration.

Figure 11 is an enlarged plan view showing the design elements of the moisture permeable sheet in the diaper shown in Figure 8.

Hereinafter, the absorbent article of the present invention (first invention) will be described with reference to Figs. 1 to 3 according to a preferred first embodiment. A part of the fracture plan view of the unfolded diaper according to the first embodiment of the present invention (first invention) is shown in Fig. 1, and a cross-sectional view taken along line I-I of Fig. 1 is shown in Fig. 2 . 3 is a cross-sectional view taken along line II-II of FIG. 1.

The disposable diaper 1A (hereinafter also referred to as "diaper 1A") of the first embodiment includes a vertically long absorbent body 10 as shown in Fig. 1, and the vertically long absorbent body 10 is disposed on the skin. The front side sheet 2 on the front side, the back sheet 3 disposed on the non-skin facing surface side, and the absorber 4 disposed between the two sheets 2 and 3, and divided into a front side portion A and a back side portion B And the lower part C. Further, in the absorbent body 10, between the back sheet 3 and the absorber 4, an indicator application region 60 coated with an indicator 6 for notifying the discharge according to a change in color is disposed in the longitudinal direction. As shown in Fig. 1, the diaper 1A is formed to be bilaterally symmetrical with respect to a center line CL extending in the longitudinal direction.

When the diaper 1A is described in detail, the absorbent body 10 of the diaper 1A is included in the longitudinal direction (hereinafter also referred to as "Y direction", and the Y direction: the direction parallel to the center line CL) as shown in Fig. 1 . The ventral side A, the back side B, and the lower part C located between the A and B. belly The side A is located on the ventral side of the wearer when the diaper is worn, the back side B is located on the back side of the wearer, and the lower part C is located on the underside of the wearer. The crotch portion C is located at the center of the longitudinal direction (Y direction) of the diaper 1A. In addition, the direction perpendicular to the longitudinal direction (Y direction) is described as the lateral direction of the diaper 1A (hereinafter also referred to as "X direction").

In the present specification, the term "skin-facing surface" refers to the surface of the front and back of each member such as the front sheet 2 constituting the diaper 1A, which is placed on the side of the wearer's skin when worn. The "opposite surface" refers to a surface on the front and back sides of each member such as the front sheet 2 that faces the side opposite to the skin side of the wearer when worn.

The absorbent body 10 of the diaper 1A is as shown in Fig. 1. The left and right sides of the ventral side A along the longitudinal direction (Y direction) and the left and right sides of the back side portion B along the longitudinal direction (Y direction) are respectively It extends outward in the lateral direction (X direction) with respect to the left and right side edges of the crotch portion C along the longitudinal direction (Y direction). Further, the left and right side edges of the crotch portion C are convexly curved toward the inner side (X-direction) inside (X-direction), and have a shape in which the center portion in the longitudinal direction (Y direction) is tapered toward the inside. The front sheet 2 and the back sheet 3 extend outward from the left and right side edges of the absorber 4 in the longitudinal direction (Y direction) and the front and rear edges of the longitudinal direction (Y direction), respectively. The front sheet 2 is as shown in Fig. 2, and its lateral direction (X direction) is smaller than the lateral direction (X direction) of the back sheet 3. The front sheet 2 and the back sheet 3 are joined to each other directly or by inserting other members from the extending portions extending outward from the outer periphery of the absorber 4, and the absorber 4 is sandwiched and fixed.

As shown in FIGS. 1 and 2, in the absorbent main body 10 of the diaper 1A, the side sheet 5 is disposed between the both side portions 10s and 10s in the longitudinal direction (Y direction) with the front sheet 2 interposed therebetween. As shown in Fig. 1, the side sheet 5 is disposed and fixed over the skin facing surface side of the front sheet 2 and along the entire side in the longitudinal direction (Y direction). The end portion of each of the side sheets 5 in the X direction (close to the center line CL) is a free end, and in the vicinity of the free end, in the crotch portion C, the elastic member 51 for forming the three-dimensional gathers is The extended state is fixedly fixed in the longitudinal direction (Y direction), and when worn, the portion of the free end is separated from the front sheet 2 by the contraction force of the elastic member to form a three-dimensional gather.

The end portion of each of the side sheets 5 on the outer side in the X direction is fixed to the back sheet 3, as shown in Fig. 2, between the end portions on the outer side of each of the side sheets 5 and the back sheet 3, In the lower portion C, the elastic member 52 for forming the leg gathers is disposed in the longitudinal direction (Y direction) in an extended state, and when worn, the leg gathers are formed by the contraction force of the elastic member.

As shown in Fig. 1, the diaper 1A is a so-called unfolded diaper, and includes a pair of left and right stretch panels 7b and 7b which are connected to the left and right outer sides of the back side portion B of the absorbent body 10. One of the diapers 1A is attached to the back side portion B, and the end portion close to the center line CL is fixed to the non-skin opposing surface of the back sheet 3, and is attached to the back side portion of the absorbent body 5. The left and right sides of B. Further, in the diaper 1A, the pair of elastic sheets 7b and 7b are fixed to the non-skin opposing surface of the back sheet 3, but may be fixed to the side sheet 5 and the back side which are disposed between the front sheet 2 and the back sheet. Between sheets 3. The fastening tape 72 to which the fixing portion 71 of the male member including the mechanical surface fastener is attached is attached to each of the elastic sheets 7b so as to extend outward in the X direction. The stretch sheet 7b is fixed to the absorbent body 10 by a method such as an adhesive or fusion.

Further, as shown in Fig. 1, the diaper 1A includes a pair of right and left panel members 7a and 7a which are connected to the left and right outer sides of the abdominal side portion A of the absorbent main body 10. The pair of sheets 7a, 7a of the diaper 1A are attached to the front side portion A, and as shown in Fig. 1, the end portion near the center line CL is fixed to the side sheet 5 and the back sheet which are disposed between the front sheet 2 and the back sheet. Between the materials 3, they are connected to the left and right sides of the abdominal side portion A of the absorbent body 5. Further, in the diaper 1A, the pair of sheets 7a and 7a are fixed between the side sheet 5 and the back sheet 3, but may be fixed to the non-skin opposing surface of the back sheet 3. The sheet 7a is fixed to the absorbent body 10 by a method such as an adhesive or fusion. Further, on the non-skin opposing surface of the front side portion A, a fastening tape 73 for fixing the fixing portion 71 of the fastening tape 72 of the back side portion B is provided between the pair of sheets 7a and 7a.

As shown in Fig. 1, the absorbent body 4 includes a layer absorbent body 41 from the abdominal side portion A and the lower side portion B, and a skin facing surface disposed on the lower layer absorbent body 41, and only the upper layer C from the abdominal side portion A. Absorber 42. In the diaper 1, as shown in Fig. 2 and Fig. 3, the upper layer absorber 42 is only spread over the crotch portion C from the ventral portion A, and the lower layer absorber 41 is from the ventral portion A to the lower part of the crotch. C, and further throughout the back side portion B, the length of the longitudinal direction (longitudinal direction (Y direction)) is such that the lower layer absorber 41 is formed longer than the upper layer absorber 42. Further, it is preferable that the width of the upper layer absorber 42 is shorter than the width of the lower layer absorber 41 when the lower layer absorber 41 has a vertically long rectangular shape. By making the width of the upper layer absorbent body 42 narrow, the flexibility of the absorber 4 is easily obtained, and therefore the conformability to the body is good. As for the length in the longitudinal direction (Y direction), the upper layer absorbent body 42 is also shortened as described above, whereby the front side portion A to the back side portion B are easily bent, and the conformability to the body is improved. However, when the lower absorbent body 41 has a shape in which the lower portion C is tapered, the width of the upper absorbent core 42 and the width of the lower absorbent core 41 are equal to the lower portion C of the crotch. Specifically, the upper layer absorber 42 is 20% or more, preferably 40% or more, and 80% or less, preferably 60% or less, of the length of the lower layer absorber 41 in the longitudinal direction (Y direction). The upper layer absorber 42 is 40% or more of the lower layer absorber 41, preferably 60% or more, and 95% or less, preferably 80% or less.

The lower absorbent core 41 is attached to the diaper 1, and as shown in FIGS. 2 and 3, the lower absorbent core 411 and the covering material 412 covering the lower absorbent core 411 are wrapped, and the lower absorbent core 411 is wrapped by the covering material 412. And formed. The upper absorbent core 42 does not include a covering material, but is formed only by the upper absorbent core 421. The basis weight of the lower 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 member 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.

When the lower absorbent core 41 is described in detail, the lower absorbent core 411 is attached to the diaper 1A, and as shown in Fig. 1, the side edges and the back side of the front side A side along the longitudinal direction (Y direction) are shown. The side edges along the longitudinal direction (Y direction) of the portion B side respectively extend outward in the lateral direction (X direction) from the both side edges of the crotch portion C along the longitudinal direction (Y direction), and are formed integrally from the longitudinal direction ( The Y-direction) has a shape in which the portion near the front side portion A is tapered toward the inner side. Further, the lower absorbent core 411 is attached to the diaper 1A, and as shown in FIGS. 2 and 3, the skin facing surface and the non-skin opposing surface of the lower absorbent core 411 are each flat. Moreover, the lower absorbent body 41 is attached to the diaper. In 1A, as shown in FIG. 2, the two sides of the covering material 412 are folded over using one covering material 412 so that the side edges of the covering material 412 are on the non-skin opposing side of the lower absorbent core 411. The lower absorbent core 411 is formed by overlapping the back sheet 3 side. The lower layer absorber 41 is formed in this manner from the front side portion A to the back side portion B. In the diaper 1A, as described above, the lower absorbent core 41 is formed by wrapping the lower absorbent core 411 with one covering material 412, but may be disposed on the skin facing side of the lower absorbent core 411. The two covering materials 412 on the non-skin facing surface side are sandwiched and formed.

When the upper absorbent core 42 is described in detail, the upper absorbent core 421 is attached to the diaper 1A, and as shown in Fig. 1, the width thereof is lower than the lower portion C of the lower absorbent core 411 of the lower absorbent core 41. The width between the both side edges is substantially uniform, and is formed in a rectangular shape which is long in the longitudinal direction (Y direction) from the abdominal side portion A only over the crotch portion C. Further, the upper absorbent core 421 is attached to the diaper 1A, and as shown in FIGS. 2 and 3, the skin facing surface and the non-skin opposing surface of the upper absorbent core 421 are each flat. Further, as shown in FIG. 2, the upper layer absorber 42 is formed only of the upper absorbent core 421. The upper layer absorber 42 is formed in such a manner that it is formed only from the crotch portion A throughout the crotch portion 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 is divided into a main absorption region 4M in which the upper layer absorber 42 and the lower layer absorber 41 overlap each other in the plan view of the absorber 4, and a sub-absorption region 4E other than the main absorption region 4M. In other words, the main absorption region 4M is a region composed of a double layer of the upper layer absorber 42 and the lower layer absorber 41, and the sub-absorption region 4E is a region composed only of a single layer of the lower layer absorber 41. More specifically, in the diaper 1A, as shown in Fig. 1, the width of the upper absorbent core 421 is substantially the same as the width at the narrowest position of the lower absorbent body 41, and therefore, the rectangular upper layer is absorbed. The core body 421 is entirely disposed on the lower layer absorber 41 in a shape in which the central portion is tapered toward the inside. Therefore, in the diaper 1A, the main absorbent region 4M composed of a double layer in which the upper absorbent core 421 and the lower absorbent core 41 overlap each other means a region in which the upper absorbent core 421 is disposed, and the secondary absorbent region 4E refers to only the lower layer. In the absorbent body 41, a region in which the upper absorbent core 421 is not disposed with a single layer of the lower absorbent core 41 is disposed.

The absorbent body 4 contains an absorbent polymer and cellulose fibers. Further, the basis weight of the absorbing polymer in the region of the lower absorbent core 41 belonging to the main absorbing region 4M is larger than that of the absorbing polymer belonging to the region of the secondary absorbing region 4E. Specifically, the lower absorbent core 41 of the lower absorbent body 41 is formed of an absorbent polymer and cellulose fibers in the diaper 1A. The basis weight of the absorbing polymer in the region of the lower absorbent core 411 belonging to the main absorption region 4M is preferably 50 g/m ² or more, more preferably 100 g/m ² or more, and preferably 500 g/m ² or less. Further, it is preferably 400 g/m ² or less, and specifically preferably 50 g/m ² or more and 500 g/m ² or less, and more preferably 100 g/m ² or more and 400 g/m ² or less. The basis weight of the cellulose fibers in the region of the lower absorbent core 411 belonging to the main absorption region 4M is preferably 0 g/m ² or more, and preferably 300 g/m ² or less, and more preferably 200 g/m ² or less. Specifically, it is preferably 0 g/m ² or more and 300 g/m ² or less, and more preferably 0 g/m ² or more and 200 g/m ² or less. On the other hand, the basis weight of the absorbing polymer in the region of the lower absorbent core 411 belonging to the secondary absorption region 4E is preferably 20 g/m ² or more, more preferably 50 g/m ² or more, and preferably 400 g. / m ² or less, and further preferably from 300g / m ² or less, specifically, is preferably 20g / m ² 400 g of the above / m ² or less, and further preferably 50g / m ² or more 300g / m ² or less. The basis weight of the cellulose fibers in the region of the lower absorbent core 411 belonging to the secondary absorption region 4E is preferably 0 g/m ² or more, and is preferably 250 g/m ² or less, and more preferably 200 g/m ² or less. Specifically, it is preferably 0 g/m ² or more and 250 g/m ² or less, and more preferably 0 g/m ² or more and 200 g/m ² or less. Further, from the viewpoint of efficiently absorbing urine, the basis weight of the absorbing polymer in the region of the lower absorbent core 411 belonging to the main absorbing region 4M is preferably lower than that in the lower absorbent core 411. The basis of the absorbing polymer in the region of the absorption region 4E is 10 g/m ² or more, and more preferably 20 g/m ² or more. The basis weight of the absorbing polymer and the cellulose fiber in the region belonging to the main absorption region 4M in the lower absorbent core 411, and the basis weight of the absorbent polymer and the cellulose fiber in the region belonging to the secondary absorption region 4E are as follows. Determined by the method.

<Absorbing polymer in the region of the lower absorbent core 411 belonging to the main absorption region 4M and Determination of the basis weight of cellulose fibers and the basis weight of absorbent polymers and cellulose fibers belonging to the region of the secondary absorption region 4E >

First, the absorber 4 is placed on a water platform, and is cut into a size of 70 mm × 70 mm in the main absorption region 4M in which the upper layer absorber 42 and the lower layer absorber 41 are overlapped, and the upper layer absorber 42 is taken from the cut sample. The portion is removed from the covering material 412, and this is set as a sample of the region of the lower absorbent core 411 belonging to the main absorption region 4M. In the case where it is difficult to cut a specific sample size in view of the size of the absorbent body, the size of the cut sample can be changed in accordance with the size of the absorbent body. A sample of the same measured weight was sealed in a bag of a nylon pack (mesh hole no. 250) sealed by heat sealing with a measured weight, and immersed in 0.1% ascorbic acid, 0.01% riboflavin (vitamin) B2) The aqueous solution is exposed to sunlight for more than 20 hours until the sample absorbs the solution and swells. Thereafter, the water was washed at any time until the yellow color of the sample in the package or the white color of the pulp was not detected, and the polymer dissolved in water was washed out to the outside of the package. Then, centrifugal dehydration was carried out at 800 rpm for 10 minutes, and dried at 80 ° C for 12 hours to 24 hours, and the reduced amount of the sample was calculated as the amount of the absorbed polymer, and the amount of the reduced amount was subtracted from the weight of the sample. The amount is set to the amount of cellulose fibers. The number of samples was set to three or more, and the average value of the samples was determined, and the basis weight of each of the absorbing polymers and the basis weight of each of the cellulose fibers were calculated from the area of the cut sample. The basis weight of the absorbent polymer and the cellulose fibers in the region of the lower absorbent core 411 belonging to the secondary absorption region 4E was measured in the same manner.

The upper absorbent body 42 preferably transfers the liquid to the lower absorbent body 41 quickly. In the above aspect, at least the upper absorbent core 42 can be made of a cellulose fiber, preferably a crosslinked fiber. A fiber formed by a plain fiber. Further, the upper layer absorber 42 does not include the covering material, but in the case where the absorbent polymer is contained, the upper layer absorber 42 may be wrapped with the covering material 412 covering the lower layer absorber 41, or may be separated from the lower layer absorber 41. Only the upper absorbent body 42 is wrapped with the covering material. The upper 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 absorbent core 41 or does not contain the absorbent polymer. Specifically, in the diaper 1A, the upper absorbent core 42 (the upper absorbent core 421) is a fibrous body formed of crosslinked cellulose fibers, and the basis weight of the absorbent polymer is preferably 0 g/m ^{2 .} The above is preferably 300 g/m ² or less, more preferably 200 g/m ² or less, and specifically preferably 0 g/m ² or more and 300 g/m ² or less, and more preferably 0 g/m ² or more and 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, and is preferably 500 g/m ² or less, and further preferably 300 g/m ^{2 .} Specifically, it is preferably 50 g/m ² or more and 500 g/m ² or less (the same range as the basis weight of the upper absorbent core 421), and more preferably 100 g/m ² or more and 300 g/m ² or less. . Further, the basis weight of the absorbing polymer of the lower absorbent core 411 (the basis weight of the absorbing polymer in the region of the lower absorbent core 411 belonging to the main absorbing region 4M and the absorbing polymer belonging to the region of the secondary absorbing region 4E) The average value of the basis weight is preferably 100 g/m ² or more, more preferably 150 g/m ² or more, and is preferably 400 g/m ² or less, further preferably 350 g/m ² or less, specifically, It is preferably 100 g/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, from the viewpoint of improving liquid diffusibility, the basis weight of the absorbent polymer of the upper absorbent core 421 is preferably the basis weight of the absorbent polymer of the lower absorbent core 411 (in the lower absorbent core 411) The basis weight of the absorbing polymer in the region of the main absorption region 4M and the basis weight of the absorbing polymer in the region of the sub-absorption region 4E are 50 g/m ² or more, and more preferably 100 g/m ² or less. The basis weight of the absorbing polymer of the upper absorbent body 421 was measured by the following method.

<Method for Measuring Absorbing Polymer of Upper Layer Absorbing Body 421 and Basis Weight of Cellulose Fiber>

First, the upper layer absorber 42 is separated from the lower layer absorber 41, and the separated upper layer absorber 42 is placed on a water platform, and cut into a size of 70 mm × 70 mm, and this is used as a measurement sample. The basis weight of the absorbent polymer and the cellulose fiber in the region belonging to the main absorption region 4M in the lower layer of the lower absorbent core 411, and the basis of the absorbent polymer and the cellulose fiber in the region belonging to the secondary absorption region 4E. The method described in the method of measurement of weight > was carried out in the same manner, and the basis weight of the absorbent polymer of the upper layer absorber 421 and the cellulose fibers was obtained.

Hereinafter, the absorbing polymer contained in the absorber 4 will be specifically described.

The water absorption amount of the absorbent polymer is preferably 10 g/g or more, more preferably 15 g/g or more, and preferably 50 g/g or less, and further preferably 30 g/g, from the viewpoint of absorption retention of excrement. 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 absorbent polymer can be determined by a method for measuring the centrifugal retention amount based on JIS K7223. The centrifugal retention amount of the water-absorbent polymer is a property associated with the water absorption amount (water absorption ratio) of the water-absorbent polymer. Generally, the water-absorbent polymer having a larger value of the centrifugal retention amount has a larger water absorption amount.

<Method for Measuring Centrifugal Holding Amount (Water Absorption)>

The measurement of the amount of centrifugal retention (water absorption) was carried out in accordance with JIS K7223 (1996). Nylon woven fabric (opening 255, sold by Sanli Manufacturing Co., Ltd., product name: nylon mesh, specification: 250 × mesh width × 30 m) was cut into a rectangle having a width of 10 cm and a length of 40 cm, and folded in half in the center in the longitudinal direction. The end was heat-sealed to produce a nylon bag having a width of 10 cm (internal size of 9 cm) and a length of 20 cm. Then, 1.00 g of the absorbent polymer as the measurement sample was accurately weighed and uniformly added to the bottom of the produced nylon bag. Then, the nylon bag containing the sample was immersed in physiological saline (0.9% by mass sodium chloride water) adjusted to a temperature of 25 °C. Then, the nylon bag was taken out from the physiological saline 1 hour after the start of the immersion, and suspended in a vertical state for 1 hour to remove water, and then dehydrated using a centrifugal dehydrator (manufactured by KOKUSAN Co., Ltd., type H-130C). The dehydration conditions were set to 143 G (800 rpm) for 10 minutes. After dehydration, the mass of the sample was measured, and the target centrifugal retention amount (water absorption amount) was calculated according to the following formula.

Centrifuge retention (g/g) = (a'-b-c)/c

In the formula, a' represents the total mass (g) of the sample and the nylon bag after centrifugal dewatering, b represents the mass (g) of the nylon bag before water absorption (during drying), and c represents the water absorption of the sample (during drying) Quality (g). The measurement system was performed 5 times (n=5), and the value of each of the upper and lower positions was deleted, and the average value of the remaining three points was set as the measured value. Further, the measurement was carried out at 23 ± 2 ° C and a humidity of 50 ± 5%, and the sample was stored in the same environment for 24 hours or more before the measurement, and then measured.

Further, from the viewpoint of absorption retention of excrement at the time of pressurization, the absorption amount under pressure of 2.0 kPa of the absorbing polymer is preferably 10 g/g or more, more preferably 15 g/g or more, and further preferably It is 50 g/g or less, more preferably 30 g/g or less, and 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. Here, the load of 2.0 kPa is roughly equivalent to the body pressure applied to the absorbent body when the absorbent article is worn. The amount of absorption under pressure is a measure indicating how much the absorbed polymer absorbs most in a state where pressure is applied to the absorber by wearing the absorbent article.

<Method for measuring the amount of absorption under pressure>

The amount of absorption under pressure is measured by the measurement method and the measurement device described in JP-A-2003-235889. That is, a nylon mesh having a mesh opening of 63 μm was prepared (a cylindrical plastic tube (inner diameter: 30 mm, height: 60 mm) having JIS Z8801-1:2000 attached to the bottom surface. Then, 0.50 g of the sample (absorbed polymer) was accurately weighed, and The sample was added to the nylon mesh of the vertical cylindrical plastic tube in such a manner as to have a substantially uniform thickness. Then, a weight of 29.5 mm in outer diameter and 22 mm in thickness was inserted into the circle by applying a load of 2.0 kPa to the sample. Inside the plastic tube of the tube. Then, the cylindrical plastic tube containing the sample and the weight is vertically immersed in a petri dish (diameter = 120 mm) containing 60 ml of physiological saline on the lower side of the nylon mesh side. After standing for 60 minutes on one side, the cylindrical plastic tube containing the sample and the weight was taken out, and after removing the water for 15 minutes, the cylindrical plastic tube containing the sample and the weight was metered, and the physiological saline absorbed by the sample was calculated. The weight obtained by dividing the weight of the absorbed physiological saline by 0.5 is the amount of absorption under pressure (g/g). The measurement is performed 5 times (n=5), and the value of each of the upper and lower points is deleted. The average value of the next three points is set as the measured value. Further, the measurement is performed at 23 ± 2 ° C and humidity of 50 ± 5%. It was measured after the sample was stored prior to assay more than 24 hours in the same environment.

Further, from the viewpoint of the diffusibility of the liquid at the time of pressurization, the liquid permeation rate under pressure of 2.0 kPa of the absorbing polymer is preferably 5 ml/min or more, more preferably 10 ml/min or more, and further preferably It is 150 ml/min or less, and more preferably 120 ml/min. Specifically, it is preferably 5 ml/min or more and 150 ml/min or less, and more preferably 10 ml/min or more and 120 ml/min or less. The liquid permeation rate under pressure is generally used as a diffusion of liquid in the absorber. Useful for indicators of speed.

<Method for measuring liquid permeation rate under pressure>

The liquid permeation rate under pressure is measured by the measurement method and the measurement device described in JP-A-2003-235889. That is, in a 100 mL glass beaker, 0.32 ± 0.005 g of the absorption polymer as a measurement sample is immersed in a physiological saline (0.9 mass% sodium chloride water) sufficient to swell, for example, a saturated absorption amount of the absorption polymer. More than twice the normal saline was placed for 30 minutes. In addition, a metal wire mesh (mesh 150 μm, bio-column sintered stainless steel filter 30SUS sold by Sansho Co., Ltd.) and a cock are provided at the lower end of the opening of the vertically erected cylinder (inner diameter 25.4 mm). a filter tube having a thin tube (inner diameter of 4 mm and a length of 8 cm), and the contents of the beaker including the swelled measurement sample are all put into the cylindrical tube while the cock is closed. Inside. Then, a cylindrical rod having a diameter of 2 mm and a metal wire mesh having a mesh diameter of 150 μm and a diameter of 25 mm is inserted into the filter cylinder tube, and the metal wire mesh is in contact with the measurement sample, and then the measurement test is performed. The weight was placed in such a manner that a load of 2.0 kPa was applied. After standing for 1 minute in this state, the cock was opened to allow the liquid to flow, and the time until the liquid level in the filter cylinder tube reached from the 60 mL mark line to the 40 mL mark line (that is, 20 mL of the liquid passed) was measured (T _{1 ).} )(second). Using the measured time T ₁ (sec), the liquid permeation rate under pressure of 2.0 kPa was calculated according to the following formula. Further, in the formula, T ₀ (sec) is a value obtained by measuring the time required for 20 ml of physiological saline to pass through the metal wire mesh without adding a measurement sample to the filtration cylindrical tube.

Liquid permeation rate under pressure (ml/min) = 20 × 60 / (T _{1 -} T ₀ )

The measurement system was performed 5 times (n=5), and the value of each of the upper and lower positions was deleted, and the average value of the remaining three points was set as the measured value. Further, the measurement was carried out at 23 ± 2 ° C and a humidity of 50 ± 5%, and the sample was stored in the same environment for 24 hours or more before the measurement, and then measured. Liquid through pressure A more detailed measurement method of the overspeed is described in paragraphs [0008] and [0009] of JP-A-2003-235889, and the measuring apparatus is described in Figs. 1 and 2 of the publication.

Further, from the viewpoint of rapidly absorbing and retaining urine, the absorption rate of the absorbent polymer measured by the DW method is preferably 10 ml/(g‧10 minutes) or more, and further preferably 20 ml/(g‧10 minutes). The above is preferably 100 ml/(g‧10 minutes) or less, more preferably 70 ml/(g‧10 minutes) or less, and specifically, preferably 10 ml/(g‧10 minutes) or more and 100 ml/( G‧10 minutes) or less is more preferably 20 ml/(g‧10 minutes) or more and 70 ml/(g‧10 minutes) or less. The absorption rate obtained by the DW method is an act of absorbing the action of the absorption of the body fluid by the absorption polymer or taking the body fluid into the gap between the particles of the adjacent absorption polymer, as a result of the absorption at the time of manufacture and body fluid absorption. Useful for the conformality of the absorbent body, especially the shape retention of the absorbent body after absorption of body fluids.

Further, from the viewpoint of rapidly absorbing and retaining urine, the absorption rate of the absorbent polymer measured by the DW method is preferably 3 ml/(g‧1 minute) or more, and further preferably 5 ml/(g‧1 minute). The above is preferably 30 ml/(g‧1 minute) or less, more preferably 20 ml/(g‧1 minute) or less, and specifically, preferably 3 ml/(g‧1 minute) or more and 30 ml/( G‧1 minute) or less is further preferably 5 ml/(g‧1 minute) or more and 20 ml/(g‧1 minute) or less.

<Method for Measuring Absorption Speed by DW Method>

The absorption rate obtained by the DW method was measured using a Demand Wettability Tester apparatus. Specifically, in the device, the liquid level of the physiological saline is set to be a polymer dispersion table [70 mm The surface of the No. 2 filter paper placed on the glass filter No. 1 was placed at the same water level, and 0.3 g of the absorption polymer to be measured was spread on the surface of the polymer dispersion table. The amount of water absorption at the time point when the absorbent polymer was dispersed was set to 0, and the amount of each water absorption after 1 minute passed and after 10 minutes passed was measured. The water absorption amount is measured by a scale of a burette indicating a decrease in the water level of the physiological saline. The value of the obtained water absorption amount was set as the absorption speed obtained by the DW method. The measurement system was performed 5 times (n=5), and the value of each of the upper and lower positions was deleted, and the average value of the remaining three points was set as the measured value. Further, the measurement was carried out at 23 ± 2 ° C and a humidity of 50 ± 5%, and the sample was stored in the same environment for 24 hours or more before the measurement, and then measured.

The above-mentioned absorbing polymer is preferably one which can absorb and retain a liquid which is 20 times or more of its own weight and which can be gelated. The absorbing polymer is preferably a particle having an average particle diameter of from 10 μm to 1000 μm, more preferably a particle having an average particle diameter of from 100 μm to 800 μm. The shape of the particles is not particularly limited, and for example, various shapes such as a spherical shape, a block shape, a grape shape, and a grass bag shape can be employed.

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

A monomer which is a water-soluble and polymerizable unsaturated group which is used in the absorption of a polymer is produced. Specific examples thereof include an olefin-based unsaturated carboxylic acid or a salt thereof, an olefin-based unsaturated carboxylic acid ester, an olefin-based unsaturated sulfonic acid or a salt thereof, an olefin-based unsaturated phosphoric acid or a salt thereof, and an olefin-based unsaturated phosphate. A vinyl monomer having a polymerizable unsaturated group such as an olefin-based unsaturated amine, an olefin-based unsaturated ammonium hydrazine or an olefin-based unsaturated decylamine.

Hereinafter, the cellulose fibers contained in the absorber 4 will be specifically described.

Examples of the cellulose fibers include cotton, pulp fibers, and rayon fibers. The cellulose fibers of the upper absorbent core 421 and the cellulose fibers of the lower absorbent core 411 may be the same fiber or different kinds of fibers. In particular, the cellulose fibers of the upper absorbent body 421 are preferably crosslinked cellulose fibers in the cellulose fibers from the viewpoint of improving the liquid return property. Examples of the crosslinked cellulose fibers include modified (cellulose) fibers described in JP-A-2010-526632, for example, chemically rigidified, kneaded, and/or Curled (curled) (cellulosic) fibers; chemically rigidified, warp-knitted and/or crimped crosslinked cellulose or synthetic polymer fibers, etc., may be used alone or in combination Use two or more types. Commercial products can also be used. For example, "ALBACEL" (trade name) manufactured by Federal Paper Board Co., "INDORAYON" (trade name) manufactured by PT Inti Indorayon Utara, and "FILTRANIER" manufactured by ITT Rayonier Inc., for example, may be mentioned. (Product name) and "POROSANIER" (trade name) manufactured by the company.

From the viewpoint of further improving the diffusibility, the covering material 412 constituting the lower layer absorbent body 41 preferably has a liquid permeability lower than that of the upper layer absorber 42. The liquid permeability is evaluated based on the liquid permeation time which can be measured by the following method. The liquid permeation time measured by the following method is preferably such that the liquid permeation time of the coating material 412 is delayed by 5 seconds or longer than the liquid permeation time of the upper layer absorber 42, and further preferably delayed by 8 seconds or longer.

<Method for measuring liquid permeation time>

As shown in Fig. 7, the two cylinders 91 and 92 having an inner diameter of 35 mm at the upper and lower ends of the opening have the axes of the two cylinders 91 and 92 aligned, and are arranged vertically, and are cut into a metal mesh having a diameter of 55 mm and a cutting sample of 40 mm square. A sheet of filter paper having a diameter of 55 mm manufactured by ADVANTEC Co., Ltd. was placed on the sheet and the upper side thereof, and sandwiched between the upper and lower cylinders 91 and 92. At this time, it is preferable that the jig 93 is fitted to the annular flange portion provided at the upper end of the upper end of the cylinder 91 and the lower end of the cylinder 92, and the upper and lower cylinders 91 and 92 are coupled. Reference numeral 94 is a gasket made of rubber or the like having a through hole having the same diameter as the inner diameter of the cylinders 91 and 92. In the state in which the upper and lower cylinders 91 and 92 are used to sandwich and fix the cut sample piece, 40 g of the artificial urine shown in Fig. ○ in Fig. ○ is supplied into the upper cylinder 91. The artificial urine supplied is passed through the cut sample piece and passed down from the lower end of the cylinder 92 to flow from the lower end of the cylinder 92. The weight measurement mechanism such as an electronic scale is used to observe the change in the weight of the artificial urine flowing down from the lower cylinder 92, and the time from the start of the supply of the artificial urine to the time until the mass becomes 20 g is measured. The above time is set as the liquid permeation time. In a plurality of measurements, the sample piece is cut each time a new sample piece is prepared. The measurement system was performed 3 times, and the average value was made into the measured value.

The composition of the artificial urine used in the measurement of 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 (hexahydrate), 0.06208% by mass of calcium chloride (dihydrate), 0.19788 mass% of potassium sulfate, 0.0035 mass% of polyoxyethylene lauryl ether and Ion exchange water (balance).

As described above, in the absorbent body 10, between the back sheet 3 and the absorbent body 4, an indicator application region 60 coated with the indicator 6 for notifying the excretion by a change in color is disposed in the longitudinal direction. Further, as shown in Fig. 2, when the diaper 1A is viewed in plan, the indicator application region 60 to which the indicator 6 is applied is disposed in the main absorption region 4M of the absorbent body 4, and the longitudinal direction (Y direction) of the indicator application region 60. The end portion 60b on the side of the back side portion B is disposed in the vicinity of the end portion 4Mb on the side of the back side portion B of the main absorption region 4M in the longitudinal direction (Y direction). Here, the indicator application region 60 refers to a region that surrounds the entire portion when the portion to which the indicator 6 is applied is viewed in a plan view. Further, the end portion 60b on the side of the back side portion B of the indicator application region 60 is disposed in the vicinity of the end portion 4Mb on the side of the back side portion B of the main absorption region 4M, and is referred to as follows: not only the indicator application region 60 The end portion 60b is disposed to coincide with the position of the end portion 4Mb of the main absorption region 4M as long as the end portion 60b of the longitudinal back side portion B side of the indicator application region 60 is in the longitudinal direction (Y direction) of the main absorption region 4M. The edge of the end portion 4Mb of the side portion B side (the edge of the end portion on the side of the back side portion B on the side in the longitudinal direction (Y direction) of the upper absorbent core 42 in the diaper 1A) is based on the longitudinal direction of the main absorbent region 4M ( The length of the Y direction) may be within about one tenth of the length of the longitudinal direction (Y direction) of the upper absorbent core 42 in the diaper 1A. For example, in the case of the diaper 1A, when the length of the upper layer absorber 42 in the longitudinal direction (Y direction) is 100 mm, it means that the end portion 60b of the indicator application region 60 is disposed on the side of the back side B of the upper layer absorber 42. The end edge of the end portion may be within a range of ±10 mm as a reference.

Further, in the diaper 1A, the end portion 60a on the side of the abdominal portion A in the longitudinal direction (Y direction) of the indicator application region 60 is disposed at the end portion on the side of the abdominal portion A side in the longitudinal direction (Y direction) of the main absorption region 4M. Near 4Ma. Here, the end portion 60a on the side of the front side portion A of the indicator application region 60 is disposed in the vicinity of the end portion 4Ma on the side of the front side portion A of the main absorption region 4M, and is referred to as follows: not only the indicator application region 60 The end portion 60a is disposed to coincide with the position of the end portion 4Ma of the main absorption region 4M as long as the end portion 60a of the longitudinal side portion A side of the indicator application region 60 is in the longitudinal direction (Y direction) of the main absorption region 4M. The edge of the end portion 4Ma of the ventral side A side (the edge of the end portion on the side of the ventral side A side in the longitudinal direction (Y direction) of the upper absorbent body 42 in the diaper 1A) is used as a reference, and is located in the longitudinal direction of the main absorbent region 4M. The length of the (Y direction) may be within about one tenth of the length of the longitudinal direction (Y direction) of the upper absorbent core 42 in the diaper 1A.

When the diaper 1A is described in more detail, as shown in FIG. 1, the position along the center line CL extending in the longitudinal direction (Y direction) is disposed over the front end edge of the upper layer absorber 42 in the longitudinal direction (Y direction). A line 61 of the indicator 6 is disposed between the line 61 of the indicator 6 and the side edges of the upper side (Y direction) of the upper absorbent body 42 over the upper absorbent body 42. In the longitudinal direction (Y direction), the front end edge is provided with two lines 62, 62 of the indicator 6 extending in parallel with the center line CL in the longitudinal direction (Y direction). Therefore, in the diaper 1A, 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 indicator 6 is spread over the longitudinal direction of the upper absorbent body 42 (Y direction) In the front end edge configuration, the end portion 60b on the side of the back side portion B of the longitudinal direction (Y direction) of the indicator application region 60 is disposed so as to be opposite to the side of the back side portion B side in the longitudinal direction (Y direction) of the main absorption region 4M. The position of the 4Mb is the same. Further, in the diaper 1A, as shown in Fig. 3, the end portion 60a on the side of the abdominal portion A in the longitudinal direction (Y direction) of the indicator application region 60 is disposed in the longitudinal direction (Y direction) of the main absorption region 4M. The positions of the end portions 4Ma on the side A side are identical.

Further, when the diaper 1A is viewed in a cross section in the lateral direction (X direction), the side portion 60s along the longitudinal direction (Y direction) of the indicator application region 60 is preferably from the viewpoint of accurately determining the degree of urination. It is disposed in the vicinity of the side portion 4Ms of the main absorption region 4M in the longitudinal direction (Y direction). Further, in the diaper 1A shown in Fig. 2, the side portion 60s of the indicator application region 60 is not disposed in the vicinity of the side portion 4Ms of the main absorption region 4M. The longitudinal direction of the indicator coating area 60 The side portion 60s in the (Y direction) is disposed in the vicinity of the side portion 4Ms of the main absorption region 4M in the longitudinal direction (Y direction), and means that not only the side portion 60s of the indicator application region 60 is disposed to be absorbed by the main portion The position of the side portion 4Ms of the region 4M is the same as long as the side portion 60s of the indicator application region 60 is the side edge of the side portion 4Ms of the main absorption region 4M in the longitudinal direction (Y direction) (the upper layer absorber 42 in the diaper 1A) The length in the lateral direction (X direction) of the main absorption region 4M (the length of the lateral direction (X direction) of the upper absorbent core 42 in the diaper 1A) is based on the side edge of the side portion in the longitudinal direction (Y direction). Within a tenth of a degree. For example, in the case of the diaper 1A, when the length of the upper layer absorbent body 42 in the lateral direction (X direction) is 40 mm, it means that the side portions 60s of the indicator application region 60 are disposed on the side edges of the side portions of the upper layer absorbent body 42. It can be within ±4mm for the reference.

The indicator application region 60 may be disposed as shown in Figs. 4(a) to 4(e), in addition to the indicator application region 60 shown in Fig. 1. 4(a) to 4(e), the indicator application region 60 is formed in the longitudinal direction (Y direction) in the longitudinal direction (Y direction) to the vicinity of the front end before the upper layer absorber 42 and in the lateral direction (X direction). At least one of the application regions 60 is applied to both side portions 60s and 60s of the upper layer absorber 42. 4(a) to 4(e) will be specifically described below.

In FIG. 4(a), the indicator agent 6 is shown spaced apart in the longitudinal direction (Y direction) to form a group of the indicator 6 extending in the longitudinal direction (Y direction) and surrounding the indicator 6 The indicator application area 60 of the group. Further, in FIG. 4(b), the indicator application region 60 in which the indicator 6 is continuously applied in the longitudinal direction (Y direction) to form one line and surrounds the line of the one indicator 6 is shown. The indicator application region 60 shown in Figs. 4(a) and (b) is disposed in the longitudinal direction (Y direction) of the upper layer absorber 42 before the rear end edge, and the longitudinal direction (Y direction) of the indicator application region 60 is back. The end portion 60b on the side B side is disposed to coincide with the position of the end portion 4Mb on the side of the back side portion B of the main absorption region 4M in the longitudinal direction (Y direction). Further, the end portion 60a on the side of the front side A side in the longitudinal direction (Y direction) of the indicator application region 60 is disposed so as to coincide with the position of the end portion 4Ma on the side of the abdominal portion A side in the longitudinal direction (Y direction) of the main absorption region 4M. .

Further, in FIG. 4(c), a group of the indicator 6 having a circular shape is alternately applied to the left and right in the longitudinal direction (Y direction) and spaced apart from each other to form an indicator 6 extending in the longitudinal direction (Y direction). And an indicator coating area 60 surrounding the group of the indicator 6. The position of the leftmost position of the indicator 6 on the left side of the indicator application region 60 shown in Fig. 4(c) coincides with the position of the side edge of the left side portion of the upper layer absorber 42 in the longitudinal direction (Y direction). The position of the rightmost side of the circular shaped indicator 6 on the right side coincides with the position of the side edge of the right side portion of the upper layer absorber 42 in the longitudinal direction (Y direction). Further, the position of the rounded-shaped indicator 6 closest to the side of the back side portion B and the position of the end of the end portion on the side of the back side portion B of the longitudinal direction (Y direction) of the upper absorbent body 42 The position of the rounded-shaped indicator 6 closest to the side of the ventral side A is closest to the lower end of the Y direction and the end of the end of the ventral side A of the longitudinal direction (Y direction) of the upper absorbent body 42. The position is the same. Therefore, the indicator application region 60 shown in FIG. 4(c) coincides with the contour of the upper layer absorber 42 and coincides with the main absorption region 4M of the absorber 4. As described above, the indicator application region 60 shown in FIG. 4(c) is disposed such that the end portion 60b on the side of the back side portion B is aligned with the end portion 4Mb on the side of the back side portion B of the main absorption region 4M, and The end portion 60a on the side of the abdominal portion A is disposed so as to coincide with the position of the end portion 4Ma on the side of the abdominal portion A of the main absorption region 4M. Further, the indicator application region 60 shown in Fig. 4(c) is disposed such that the both side portions 60s and 60s thereof coincide with the positions of the both side portions 4Ms and 4Ms of the main absorption region 4M.

Further, in FIG. 4(d), an indicator coating region 60 in which the indicator 6 composed of two lines is disposed at a position diagonal to the upper layer absorber 42 and surrounds the two indicators 6 is shown. . The indicator application region 60 shown in Fig. 4(d) is formed by arranging two lines of the indicator 6 at the diagonal of the upper layer absorber 42 as described above, and therefore, Fig. 4(d) The indicator application region 60 is shown to coincide with the contour of the upper absorbent body 42 and coincide with the main absorbent region 4M of the absorbent body 4. As described above, the indicator application region 60 shown in FIG. 4(d) is disposed such that the end portion 60b on the side of the back side portion B is aligned with the end portion 4Mb on the side of the back side portion B of the main absorption region 4M, and The end portion 60a on the side of the abdominal portion A is disposed so as to coincide with the position of the end portion 4Ma on the side of the abdominal portion A of the main absorption region 4M. Moreover, the indicator application region 60 shown in Fig. 4(d) is on both sides The portions 60s and 60s are arranged to coincide with the positions of the both side portions 4Ms and 4Ms of the main absorption region 4M.

Further, in Fig. 4(e), the positions of the both side edges along the longitudinal direction (Y direction) of the upper layer absorber 42 and the longitudinal direction (Y direction) of the upper layer absorber 42 are shown. The position of the center line CL is disposed with an indicator coating region 60 that surrounds the line of the three indicators 6 extending in the longitudinal direction (Y direction) and surrounds the lines of the three indicators 6. The position of the line of the indicator 6 on the left side of the indicator application region 60 shown in Fig. 4(e) coincides with the position of the side edge of the left side portion of the upper layer absorber 42 in the longitudinal direction (Y direction), and the right side The position of the line of the indicator 6 coincides with the position of the side edge of the right side portion of the upper layer absorber 42 in the longitudinal direction (Y direction). Further, the position of the line of the three indicators 6 closest to the front end of the back side B side in the Y direction is the same as the position of the end of the end portion of the upper side absorber 42 in the longitudinal direction (Y direction) on the side of the back side B side. The position of the lower end in the Y direction closest to the side of the abdominal portion A coincides with the position of the edge of the end portion on the side of the abdominal side A of the longitudinal direction (Y direction) of the upper absorbent body 42. Therefore, the indicator application region 60 shown in Fig. 4(e) coincides with the contour of the upper layer absorber 42 and coincides with the main absorption region 4M of the absorber 4. As described above, the indicator application region 60 shown in FIG. 4(e) has the end portion 60b on the side of the back side portion B disposed so as to coincide with the position of the end portion 4Mb on the side of the back side portion B of the main absorption region 4M, and The end portion 60a on the side of the abdominal portion A is disposed so as to coincide with the position of the end portion 4Ma on the side of the abdominal portion A of the main absorption region 4M. Further, the indicator application region 60 shown in Fig. 4(e) is disposed such that the both side portions 60s and 60s thereof coincide with the positions of the both side portions 4Ms and 4Ms of the main absorption region 4M.

The material for forming the diaper 1A of the present embodiment will be described.

The front sheet 2 and the back sheet 3 are generally used without any particular limitation as long as they are used in absorbent articles such as disposable diapers. For example, as the front sheet 2, a hydrophilic and liquid permeable non-woven fabric or the like can be used, and as the back sheet 3, a liquid impervious or water-repellent resin film, a laminate of the resin film and the non-woven fabric, or the like can be used. As the covering material 412 constituting the lower layer absorbent body 41, a core material comprising a hydrophilic sheet such as water-permeable tissue paper (toilet paper) or a water-permeable nonwoven fabric can be used. As the side sheet 5 forming the three-dimensional pleats or the leg pleats, generally, if it is an absorbent such as a disposable diaper The user of the product can be used without any particular limitation, and a stretchable film, a nonwoven fabric, a woven fabric, or the like can be used.

The elastic member 51 for forming the three-dimensional pleats and the elastic member 52 for forming the leg gathers are generally used without any particular limitation as long as they are used in absorbent articles such as disposable diapers. For example, polyethylene-alpha olefin copolymers including natural rubber, polyurethane, polystyrene-polyisoprene copolymer, polystyrene-polybutadiene copolymer, ethyl acrylate-ethylene, and the like can be used. a linear stretchable material such as a material.

The indicator 6 is usually used without any particular limitation as long as it is a user of an absorbent article such as a disposable diaper. For example, a sheet such as a film or a non-woven fabric different from the back sheet 3 may be used, or a colored material which is colored, discolored or discolored by contact with excrement may be directly applied to the back sheet 3. For example, as the colored material, a mixture of a pH indicator and an oxidizing compound or the like can be used.

As the stretch sheet 7b, for example, (1) a sheet in which the extensible fiber layer and the elastic fiber layer are integrated on one side or a single side, (2) an extensible fiber layer and a mesh-like elastic sheet can be used. A sheet formed by integrating two sides or one side, (3) a sheet of an extensible fiber layer and an elastic sheet comprising an elastic film, which are integrated on both sides or a single side. The sheet 6a is generally used without any limitation as long as it is a user of an absorbent article such as a disposable diaper. For example, a liquid impervious nonwoven fabric or the like can be used. The fastening tape 72 is generally used without any particular limitation as long as it is a user of an absorbent article such as a disposable diaper. For example, as the fixing portion 71 of the fastening tape 72, "Magic Tape (registered trademark)" (manufactured by Kuraray Co., Ltd.), "QUICKLON (registered trademark)" (manufactured by YKK Co., Ltd.), and "Magicloth (registered trademark)" can be used. (manufactured by Kanebo Bell-Touch Co., Ltd.), etc.

For fixing the front sheet 2, the back sheet 3, the side sheet 5, the fastening tape 72, and the like, a hot-melt adhesive or a heated embossing or ultrasonic used in an absorbent article such as a disposable diaper is usually used. Fusion methods such as embossing and high frequency embossing.

The effect of the disposable diaper 1A of the embodiment of the present invention (first invention) will be described.

As shown in Fig. 1 and Fig. 2, the diaper 1A includes an absorbent body 4 including a layer of the absorbent body 41 from the abdominal side A and the lower side B, and a skin opposite surface disposed on the lower absorbent body 41. The side portion A only passes over the layer absorber 42 above the crotch portion C, and the basis weight of the absorbing polymer of the upper layer absorber 42 is smaller than the basis weight of the absorbing polymer of the lower layer absorber 41. Therefore, in the upper layer absorber 42, a structure in which urine easily diffuses is formed. Further, the basis weight of the absorbing polymer in the region of the main absorbent region 4M in which the upper absorbent core 42 and the lower absorbent core 41 overlap in the lower absorbent body 41 is higher than that in the region of the secondary absorbent region 4E other than the main absorbent region 4M. Since the basis is large, the urine which migrates from the upper absorbent body 42 is mainly easily held by 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 application region 60 is disposed in the main absorption region 4M, and the end portion of the indicator application region 60 on the side of the back side portion B side. 60b is disposed in the vicinity of the end portion 4Mb on the side of the back side portion B of the main absorption region 4M. Therefore, the indicator 6 of the indicator application area 60 is easily and accurately discolored by the urine mainly held by the main absorption area 4M, and the accuracy of the replacement period of the diaper 1A is improved. Thus, the accuracy of the replacement period of the diaper 1A is improved, and therefore, according to the diaper 1A, the urine is less likely to leak from the lower portion C of the crotch.

Further, in the diaper 1A, as shown in Fig. 3, the end portion 60a on the side of the abdominal portion A in the longitudinal direction (Y direction) of the indicator application region 60 is disposed on the ventral side in the longitudinal direction (Y direction) of the main absorption region 4M. Near the end 4Ma of the portion A side. Therefore, it can be confirmed at a glance that urine is absorbed up to the end of the main absorption region 4M, and therefore the accuracy of the replacement period is further improved.

In particular, in the diaper 1A, the indicator application region 60 is as shown in Fig. 3, and the end portion 60b on the side of the back side portion B is disposed to be located at the end portion 4Mb on the side of the back side portion B of the main absorption region 4M. The end portions 60a on the side of the front side A are arranged to coincide with the positions of the end portions 4Ma on the side of the front side A side of the main absorption region 4M. Therefore, the indicator 6 of the indicator application area 60 is easily more accurately discolored by the urine mainly held by the main absorption area 4M, and the diaper 1A is The accuracy of the replacement period is further enhanced.

Next, a pants-type disposable diaper 1B (hereinafter also referred to as "diaper 1B") as a second embodiment of the present invention (first invention) will be described with reference to FIG. 5 and FIG.

The diaper 1B of the second embodiment will be described as being different from the diaper 1A of the first embodiment. The diaper 1A is appropriately used in the same manner as the diaper 1A unless otherwise specified.

As shown in FIGS. 5 and 6, the diaper 1B is provided with a hydrophilic sub-layer sheet which is less likely to be compressed (lower compression work amount) than the upper layer absorber 42 between the absorber 4 and the top sheet 2. 8. The sub-layer sheet 8 included in the diaper 1B has a rectangular shape in plan view, and as shown in FIG. 5, the length in the lateral direction (X direction) is the same as the length in the lateral direction (X direction) of the upper layer absorber 42, and the longitudinal direction (Y direction) The length is the same as the length of the upper layer absorber 42 in the longitudinal direction (Y direction). That is, the sub-layer 42 of the diaper 1B is disposed on the skin facing surface of the upper absorbent body 42 of the absorber 44 as shown in Fig. 6, and is disposed only from the crotch portion A throughout the crotch portion C, and is not disposed. Back side B.

The secondary sheet 8 preferably has a basis weight of 10 g/m ² or more and 100 g/m ² or less. As the sub-layer sheet 8, a sheet mainly composed of a hydrophilic fiber (a sheet having a hydrophilic fiber content of preferably 90% by mass or more) can be used, and examples of the sheet include paper, non-woven fabric, and net. It is a non-woven fabric such as hot air or resin bonding. The hydrophilic fiber is a fiber which has a hydrophilic surface and which can form a sheet having a high degree of freedom between fibers in a wet state, and can be used without particular limitation. For example, hydrophilization can be used. Polyethylene, polypropylene or polyethylene terephthalate, or such composite fibers. Further, the secondary layer sheet 8 may contain other components such as a water-absorbent polymer, a deodorant or the like in addition to the hydrophilic fibers.

The compression working amount of the secondary 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, and further preferably 400 g ‧ cm / cm ² or less, specifically, is preferably ² or more 500g‧cm / cm ² or less 50g‧cm / cm, further preferably ² or more 400g‧cm 100g‧cm / cm / ² less cm. The amount of compression of the lower absorbent body 41 is preferably 200 g ‧ cm / cm ² or more, more preferably 300 g ‧ cm / cm ² or more, and is preferably 1200 g ‧ cm / cm ² or less, and further preferably 900 g ‧ cm / cm ² or less, specifically, is preferably ² or more 1200g‧cm / cm ² or less 200g‧cm / cm, further preferably ² or more 900g‧cm 300g‧cm / cm / cm ² or less. The amount of compression of the upper absorbent body 42 is preferably 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, and further preferably 800 g ‧ cm / cm ² or less, specifically, is preferably ² or more 1200g‧cm / cm ² or less 300g‧cm / cm, further preferably ² or less 400g‧cm / cm ² or more 800g‧cm / cm. In particular, the compression work amount of the sub-layer sheet 8 is preferably 50 g ‧ cm/cm ² or more higher than the compression work amount of the upper layer absorber 42 from the viewpoint of improving the diffusibility at the time of pressurization, and further preferably It is 100 g‧cm/cm ² or more. The compression workload was measured by the following method. The higher the value of the compression workload, the easier it is to be compressed (easy to compress), and the lower the value, the less likely it is to be compressed (not easily compressed).

<Method for measuring compression workload>

For the measurement of the compression workload, the compression workload of the sample was determined by using a KES-FB3-AUTO-A compression tester manufactured by Jiaduo Technology Co., Ltd.: WC value (unit: g‧cm/c ² ) Seek. The measurement conditions were carried out at a compression deformation speed of 0.10 mm/sec and a compression maximum load condition: 50 gf/cm ² . When the object to be measured is a fiber of cellulose fibers or a polymer, and the like is not coated with a covering material or the like, and it is difficult to measure the form, the basis weight may be 10 g/m ² to 30 g/m ^{2 .} The spunbonded non-woven fabric is coated to form a sample piece. The difference in the sample piece was measured three times, and the average value was set to the compression work amount (g‧ cm/cm ² ).

The effect of the diaper 1B of the second embodiment of the present invention (first invention) will be described.

The diaper 1B of the second embodiment is related to the diaper 1A of the first embodiment. The effect is different. The effect of the diaper 1A is appropriately applied as in the case of the diaper 1A, and the description of the effect of the diaper 1A is appropriately applied.

As shown in Fig. 5 and Fig. 6, the diaper 1B is disposed between the absorbent body 4 and the front sheet 2, and has a smaller compression load than the upper absorbent core 42 than the upper absorbent core 42 (the compression work is relatively small). Low) hydrophilic sublayer sheet 8. Therefore, the urine absorbing ability can be enhanced, and the phenomenon that the absorbed urine is returned to the side of the front sheet 2 (rewetting) can be reduced. In particular, in the diaper 1B, as shown in Figs. 5 and 6, the sub-layer 42 is disposed only from the ventral portion A throughout the crotch portion C, so that the urine absorption capacity of the urine mainly held by the main absorption region 4M can be enhanced. Since it is not disposed on the back side portion B, it is difficult to affect the discoloration of the indicator 6 of the indicator application region 60.

The absorbent article according to the first aspect of the invention is not limited to the diaper 1A of the first embodiment and the diaper 1B of the second embodiment, and can be appropriately changed. In addition, each of the components of the diapers 1A to 1B of the above-described first to second embodiments can be combined as appropriate without departing from the scope of the invention (the first invention).

For example, the absorbent article of the present invention (first invention) may be a pants-type disposable diaper other than the diaper 1A or 1B, or may be a disposable diaper such as a menstrual napkin. , receiving a urine pad, etc.

In the following, the absorbent article of the present invention (second invention) will be described with reference to the drawings based on a disposable diaper as a preferred embodiment. As shown in FIGS. 8 and 9, the diaper 1C of the present embodiment includes the absorbent body 4 and the back sheet 3 disposed on the non-skin opposing surface side of the absorbent body 4, and has a front and rear direction corresponding to the wearer. Longitudinal Y and transverse X orthogonal to it.

In the present invention, the skin facing absorbent article (diaper 1C) or its constituent members (front sheet 2, back sheet 3, absorbent body 4, etc.) are worn toward the wearing article. The surface on the skin side of the non-skin-facing surface is the surface on the opposite side (dressing side) from the skin side when the absorbent article is worn in the non-skin-facing surface. Further, the longitudinal direction Y is aligned with the longitudinal direction (longitudinal direction) of the absorbent article or its constituent members, and the lateral X-shape is aligned with the width direction of the absorbent article or its constituent members.

As will be further explained, the diaper 1C is a so-called unfolded disposable diaper, and as shown in Figs. 8 and 9, the front sheet 2 which forms the liquid permeability of the skin facing surface, and the liquid which forms the non-skin opposing surface are formed. The back sheet 3 which is impervious or water repellent (hereinafter, collectively referred to as liquid impermeability), and the liquid retaining body 4 disposed between the sheets 2 and 3, and as shown in FIG. It is formed into a long shape in one direction (longitudinal direction Y) in a plan view and is substantially vertically long. The front sheet 2 and the back sheet 3 have a size larger than that of the absorber 4, and extend outward from the periphery of the absorber 4.

As shown in Fig. 8, the diaper 1C includes a front side portion A disposed on the front side of the wearer when worn, a lower portion B disposed on the crotch portion, and a back side portion C disposed on the back side. The crotch portion B includes an excretory portion facing portion that is disposed opposite to the excretory portion of the wearer when worn. The diaper 1C is formed in an arc shape inwardly along both sides of the longitudinal direction Y of the crotch portion B, and as shown in FIG. 8, has an hourglass-like shape in which the central portion of the longitudinal direction Y is tapered toward the inner side in plan view. .

The ventral side A is a region within 100 to 180 mm from the one end portion 1a of the longitudinal direction Y of the diaper 1C (the longitudinal end portion of the absorbent article which is disposed on the ventral side of the wearer when worn), and occupies the longitudinal direction of the diaper 1C. The total length of Y is 25~40%. Further, the back side portion C is an area which is within 100 to 180 mm from the other end portion 1c of the longitudinal direction Y of the diaper 1C (in the absorbent article, the longitudinal end portion of the portion disposed on the back side of the wearer when worn), and diapers The longitudinal length of 1C is 25~40% of the total length. Further, the lower part B is a region sandwiched between the front side portion A and the back side portion C, and accounts for 25 to 40% of the total length of the longitudinal direction Y of the diaper 1C.

As shown in FIG. 9, the absorber 4 includes a liquid-retaining absorbent core 40 and a core material 41 which is permeable to the skin facing surface and the non-skin opposing surface of the absorbent core 40, respectively. The packaged core material 41 includes a first package of the core material 41a (hydrophilic nonwoven fabric) covering the skin facing surface of the absorbent core 40 (opposite surface with the front sheet 2); and the second package chip The material 41b (hydrophobic nonwoven fabric) covers the non-skin opposing surface (opposite surface of the back sheet 3) of the absorbent core 40 and is rolled up to the side edge of the longitudinal direction Y of the skin facing surface. The packaged core material 41 is used to maintain the shape retention of the absorbent core 40. The absorbent core 40 and the core sheet 41 may be joined by a known joining mechanism such as a hot melt adhesive.

The absorber 4 is sandwiched and fixed by the front sheet 2 and the back sheet 3. The waist elastic members 51 are fixed to the two sheets 2 and 3 constituting the waist portion 5 in an extended state in each of the waist portions 5 and 5 extending in the front-rear direction before the longitudinal direction Y of the absorbent body 4, and Each of the leg portions 6, 6 of the absorbent body 4 extending in the lateral direction X along the left and right side edges of the longitudinal direction Y, the leg elastic member 61 is fixed in an extended state between the two sheets 2, 3 constituting the leg portion 6, and is worn In the case of the diaper 1C, the waist gathers and the leg gathers are formed by the contraction of the elastic members 51 and 61. Further, a three-dimensional shield 7 is provided on the left and right sides of the longitudinal direction Y on the side of the front sheet 2 of the diaper 1C. The three-dimensional protective elastic member 71 is fixed to the free end of the three-dimensional shield 7 in an extended state, and when the diaper 1C is worn, the three-dimensional wrinkles are formed by the contraction of the elastic member 71.

As shown in Fig. 8, a pair of fastening tapes 8, 8 are provided on both side edges of the back side portion C of the diaper 1C along the longitudinal direction Y. A fixing portion (not shown) including a male member having a mechanical surface fastener is attached to the fastening tape 8. Moreover, the adhering region 9 of the female member including the mechanical surface fastener is formed on the non-skin opposing surface of the abdominal side portion A of the diaper 1C (the non-skin opposing surface of the back sheet 3). The fixing region 9 is formed by bonding and fixing a female member of a mechanical surface fastener to a non-skin opposing surface of the back sheet 3 by a known joining method (for example, an adhesive or heat sealing), and is detachable. The above-mentioned fixing portion of the fastening tape 8 is fixed freely.

As shown in FIGS. 8 and 9, the back sheet 3 has a laminated structure of the moisture permeable sheet 30 and the nonwoven fabric 31. The moisture permeable sheet 30 forms an inner layer sheet of the skin facing surface (opposite side with the absorber 4) of the back sheet 3, and the nonwoven fabric 31 forms the non-skin facing surface of the back sheet 3 (diaper 1C) The outer surface sheet of the outer layer is composed of the moisture permeable sheet 30 and the nonwoven fabric 31 in the order of the distance from the absorber 4 in the order of the outer layer. As shown in Fig. 8, the moisture permeable sheet 30 and the nonwoven fabric 31 have the same length in the longitudinal direction Y, but the length in the lateral direction X (width) The moisture permeable sheet 30 is shorter than the non-woven fabric 31 and has a relatively narrow terrain. Each of the moisture permeable sheet 30 and the nonwoven fabric 31 is disposed over the front side portion A, the lower portion B, and the back side portion C. The moisture permeable sheet 30 has a larger size than the absorbent body 4, and the entire area of the non-skin opposing surface of the absorbent body 4 (opposite to the back sheet 3) is covered with the moisture permeable sheet 30. The moisture permeable sheet 30 and the nonwoven fabric 31 may be joined by a known joining mechanism such as a hot melt adhesive.

As the constituent members constituting the diaper 1C or more, members previously known in the art can be used without particular limitation. As the front sheet 2, a liquid permeable sheet can be used, and for example, a hydrophilic nonwoven fabric or the like can be used. As the absorbent core 40, for example, a fiber assembly including a wood pulp, a hydrophilic fiber such as a synthetic fiber treated with a hydrophilizing agent, or a particulate water-absorbent polymer can be used in the fiber collection. The body is the same as the body. As the core sheet 41 (41a, 41b) covering the absorbent core 40, for example, paper such as toilet paper or a liquid-permeable sheet such as various nonwoven fabrics or apertured films can be used. As the elastic members 51, 61, 71, various elastomer materials can be used.

The packaged chip material 41 (41a, 41b) is preferably a second package of the core material 41b which is in contact with the indicator 10 for the purpose of discoloring the indicator 10 described below after the absorption core 40 sufficiently absorbs moisture. In order to be a hydrophobic sheet, specifically, a spunbonded nonwoven fabric comprising a polyolefin resin such as polypropylene, a spunbond melt blown (SM, Spunbond Meltblown) nonwoven fabric, a spunbond-meltblown-spunbond ( SMS, Spunbond Meltblown Spunbond) Non-woven, spunbond Meltblown Meltblown Spunbond non-woven fabrics, etc. The basis weight of the packaged core material 41 (41a, 41b) is preferably 8 to 25 g/m ² , and more preferably 10 to 20 g/m ² . Further, by selecting the degree of water pressure resistance of the nonwoven fabric for wrapping the core material 41b, the period of discoloration of the indicator 10 described below can be adjusted. As an example of the absorbent body 4 as described above, the hydrophilic core material 41a using the opposite side of the skin is hydrophilic by applying a surfactant such as a polypropylene non-woven fabric (base weight: 15 g/m ² ). The coated core material 41b which is hydrophobic on the non-skin facing surface side is an absorbent body made of a polypropylene non-woven fabric (base weight: 15 g/m ² ) made of polypropylene, thereby obtaining a coated chip using the opposite side of the skin. The effect of improving the water absorption of the moisture of the material 41a and the liquid-repellent effect of the coated core material 41b on the non-skin facing surface side. According to the latter liquid-repellent effect, before the absorbent core 40 sufficiently absorbs moisture (the absorbent core 40 is in a state in which it can be used), moisture does not easily pass through the non-skin-facing side of the packaged core material 41b. It can effectively prevent the discoloration of the indicator 10 before the replacement period is reached.

As the moisture permeable sheet 30 constituting the back sheet 3, a "resin film having moisture permeability by passing through fine pores of the sheet in the thickness direction" can be used, and as the resin film, for example, it can be used. A film of a resin such as a polyolefin such as polyethylene or polypropylene. As the nonwoven fabric 31 constituting the back sheet 3, for example, a spunbonded nonwoven fabric, a spunbond-meltblown-spunbond (SMS) nonwoven fabric, a spunbond-meltblown-meltblown-spunbond (SMMS) nonwoven fabric, a hot air non-woven fabric, or the like can be used. Water needles are not woven. In the back sheet 3, the back sheet 3 may have liquid impermeability as a whole, and the moisture-permeable sheet 30 and the nonwoven fabric 31 may not necessarily have liquid impermeability. The basis weight of the moisture-permeable sheet 30 is preferably 5g / m ² or more, and further preferably 8g / m ² or more, and preferably 50g / m ² or less, and further preferably 40g / m ² or less, and more Specifically, it is preferably 10 to 30 g/m ² , and more preferably 15 to 25 g/m ² . Further, the basis weight of the nonwoven fabric 31 is preferably 5 g/m ² or more, more preferably 8 g/m ² or more, and further preferably 40 g/m ² or less, further preferably 30 g/m ² or less, more specifically In other words, it is preferably 10 to 25 g/m ² , and more preferably 12 to 20 g/m ² .

As shown in FIGS. 8 and 9, between the back sheet 3 and the absorber 4 in the lower portion B, more specifically, between the moisture-permeable sheet 30 and the packaged core member 41b, Indicator 10 for discoloration by contact with moisture or body fluids (urine, feces, menstrual blood, etc.). The indicator 10 contains a hydrophilic composition containing a color-changing substance that changes visually by contact with moisture, and an adhesive substance that functions as an adhesive, and the indicator 10 has a wearer In addition to the function of the indicator mechanism of the observer (for example, the mother), the excretion of the body fluid (for example, an infant) also functions as a joint mechanism for joining the back sheet 3 and the absorber 4. The indicator 10 is based on the skin pair of the moisture permeable sheet 30 The hydrophilic composition is applied to the non-skin opposing surface of the surface or the packaged core material 41b. The color of the indicator 10 before and after the color change is different from the color of the moisture permeable sheet 30 and the nonwoven fabric 31, respectively. In the present embodiment, the natural color of the moisture permeable sheet 30 and the nonwoven fabric 31 is white in the same color as the material of the back sheet in the absorbent article, and the color (yellow) before the discoloration of the indicator 10 and The color (blue) after discoloration is visible through the back sheet 3 (the moisture permeable sheet 30 and the non-woven fabric 31), and can be seen from the outside of the diaper 1C.

In the present embodiment, the indicator 10 is provided in a straight line extending in the longitudinal direction Y at the central portion of the lateral direction X of the diaper 1C, and extends over the entire length of the longitudinal direction Y of the lower portion B. The indicator 10 for notifying the excretion of bodily fluids such as urine is disposed in the lower part B of the body where the body fluid is directly excreted, and the discoloration of the indicator 10 in the lower part B is caused by the ventral side A or the back which is relatively difficult to change color. The comparison of the side portions C can be clearly discerned. The length Y of the indicator 10 is preferably from 100 to 400 mm, more preferably from 150 to 300 mm, and the length (width) of the transverse direction is preferably from 1 to 10 mm, and more preferably from 2 to 6 mm.

Examples of the above-mentioned color-changing substance contained in the indicator 10 (hydrophilic composition) include a pH indicator. The pH indicator can be appropriately selected depending on the type of the absorbent article to which the indicator 10 is applied, etc., and in the case where the absorbent article is a disposable diaper as in the present embodiment, it is preferably used in a color before and after contact with urine. The change is, for example, preferably bromophenol blue, methyl orange, alizarin S, bromocresol green, methyl red, bromocresol purple, resazurin, etc., when the pH is 3 to 7.

In the present embodiment, the indicator 10 is yellow before discoloration (before contact with moisture or body fluid), blue after discoloration, and the color of the indicator 10 before and after discoloration is a complementary color. The color in the relationship of complementary colors refers to a combination of colors in a relationship at exactly opposite positions in the hue circle, such as "red/blue-green", "orange/blue", "yellow/blue-violet" and the like. The combination of complementary colors to each other sets off each other's colors.

As a coloring matter (pH indicator) which is yellow before discoloration and blue after discoloration, for example, bromocresol green is exemplified.

Moreover, it is preferable that the above-mentioned adhesive substance contained in the indicator 10 (hydrophilic composition) is compatible with the above-mentioned color-changing substance, and it is hydrophilic. As the substance as described above, for example, a hydrophilic substance functioning as an adhesive for bonding the back sheet 3 (moisture-permeable sheet 30) and the absorber 4 (packaged chip 41b) at least before contact with moisture is mentioned. The polymer, specifically, for example, polyethylene glycol (PEG), polypropylene glycol (PPG, Polypropylene glycol), polyvinyl alcohol (PVA, polyvinyl alcohol), polyamine, vinyl pyrrolidine Ketone homopolymers and the like.

A moisture permeable sheet 30 which is a main characteristic portion of the diaper 1C of the present embodiment will be described in the permeable sheet 1C in the moisture permeable sheet 30 as shown in Figs. 8 and 10 . The indicator corresponding region 30A overlapping the indicator 10 in the thickness direction (as shown in FIG. 8 and overlapping the indicator 10 in a plan view) has a plurality of squares (not shown) in a square shape of 1 cm square The design element 35 of the same color or similar color as the color of the indicator 10 is printed. The plurality of design elements 35 are each surrounded by a non-printing unit 36 that is not printed. The non-printing portion 36 is the natural color of the moisture permeable sheet 30, and is white in the present embodiment. In the present embodiment, the design element 35 is printed on the non-skin opposing surface of the moisture permeable sheet 30 (opposite surface with the nonwoven fabric 31).

In the present embodiment, as shown in FIG. 10, a plurality of design elements 35 are formed in a plan view (circular shape) in plan view, and are printed in a regular pattern on the moisture-permeable sheet 30 (indicator-corresponding region 30A) in a regular pattern. The plurality of design elements 35 are uniform in size. In the present embodiment, the plurality of design elements 35 and the printing design surrounding the non-printing portions 36 extend over the entire area of the non-skin opposing surface (opposite surface of the moisture-impermeable sheet 31) of the moisture-permeable sheet 30. Implementation. The printing pattern (the above-described printing design) of the design element 35 is the same in the other portions of the indicator-compatible region 30A and the moisture-permeable sheet 30.

As described above, in the present embodiment, the color of the indicator 10 after discoloration (after contact with moisture or body fluid) is blue, and therefore, the plurality of design elements 35 printed on the moisture permeable sheet 30 are blue. Color or its similar color. Therefore, in the present embodiment, the design element 35 The color is in a complementary color to the color (yellow) before the discoloration of the indicator 10.

In the present invention (second invention), the similarity between the color of the indicator after discoloration and the color of the design element can be determined by the observer having the usual attention as long as the two colors are similar. . From the viewpoint of making the observer's discrimination higher, the color of the design element 35 is effective as the scale of the evaluation, and is an L*C*h color system, which can be specified by the h value. Specifically, it is preferable that the difference (Δh) between the color of the color change of the indicator 10 and the h value (direct measurement) of the color of the design element 35 is 0° to 30°, and further preferably Set to 0°~20°. By setting the above Δh to the above range, it is possible to visually discriminate the difference between the indicator 10 and the design element 35 after the discoloration, and the observer can feel that both have similar colors. The measurement of the above L* C* h can be measured using a simple spectrophotometer NF333 (manufactured by Nippon Denshoku Industries Co., Ltd., trade name). For measurement conditions and measurement methods, use A 4 mm ND110 sensor was measured with a light source of C/2 and a viewing angle of 2° (average of three measurements). As the indicator 10, for example, if bromocresol green is used as a color-changing substance (pH indicator) and yellow color is displayed before discoloration, and blue color is changed after discoloration, the yellow color before color change is listed. * The value of C* h (L* value: 90.06, C* value: 28.23, h value: 104.19°) and the value of L* C* h of the blue after discoloration (L* value: 74.13, C*) Value: 9.39, h value: 175.93 °).

In this manner, the indicator corresponding region 30A of the white moisture-permeable sheet 30 is printed in a plurality of colors in a square shape of 1 cm square, and is printed in a color different from the original color and discolored with the indicator 10. The latter color (blue) is a design element 35 of the same color or a similar color, and the appearance is good as compared with the unpatterned diaper which is not printed as described above, and as an observer for observing the diaper 1C from the outside. In the case of "the impression of the color of the indicator corresponding area 30A", the color of the design element 35 is more conspicuous than the original color, and it is an impression of a substantially blue color (a blue color). In this case, when one of the yellow indicator 10 contacts the body fluid such as urine to change color to blue, as shown in FIG. 10(b), the blue discolored portion 11 and the discolored portion 11 are covered. Blue on the outer surface side (non-skin opposite side) The contrast of the indicator corresponding region 30A (the moisture permeable sheet 30) of the impression of the color is weakened, and therefore, the viewer can be given a portion of the linear indicator 10 which is a yellow line extending in the longitudinal direction Y (the discolored portion 11) The disappearing impression, as a result, can effectively appeal to the observer to pay attention to the visual change of the indicator 10, that is, the replacement period of the diaper 1C.

In particular, in the present embodiment, since the design element 35 is printed in a regular pattern in a distributed pattern, the impression of the color of the indicator corresponding region 30A given to the observer is likely to be the same as the color of the design element 35. Therefore, in combination with the color (blue) of the design element 35 and the color (yellow) before the discoloration of the indicator 10 is in a complementary color, the indicator corresponding to the area 30A of the blue color before the color change of the indicator 10 The contrast of the yellow indicator 10 is strong and the indicator 10 is easily discernible, and after the discoloration of the indicator 10, the observer can be made impressed with the sense of disappearance of the discolored portion 11. In particular, in the present embodiment, the plurality of design elements 35 and the printing design surrounding the non-printing portions 36 are spread over the non-skin opposing surface of the moisture permeable sheet 30 (opposite surface with the nonwoven fabric 31). The entire area is implemented, and therefore, the above-described effects (the improvement of the appearance of the diaper 1C and the visual change of the indicator 10) are more effectively exerted.

However, even if the color of the indicator 10 and the color of the design element 35 of the indicator corresponding region 30A covering the outer surface side thereof are as described above, the above-described indicator may not be sufficiently obtained according to the printing pattern of the design element 35. The visual disappearance effect of the color changing portion 11 of 10. Therefore, in the present embodiment, the print pattern of the design element 35 is set as follows. In other words, as shown in FIG. 11, one of the plurality of design elements 35 in the indicator corresponding region 30A is set as the specific design element 35a, and one of the positions closest to the specific design element 35a is set as one. When the design element 35b is closest to each other and a virtual straight line L passing through the center of each of the specific design element 35a and the design element 35b is drawn, the length L1 of the overlapping portion of the virtual line L with the specific design element 35a and the imaginary The length L2 of the overlapping portion of the straight line L closest to the design element 35b and the absence of the imaginary straight line L from the specific design element 35a and the closest design element 35b, respectively The length L3 of the overlapping portion of the printing portion 36 is the same or longer than the length L3. Furthermore, depending on the shape of the design element (specific design element, closest to the design element), there is a case where the "center" cannot be obtained. In the above case, the imaginary line is drawn by the "center of gravity" of the design element. Just fine. In the present embodiment, the plurality of design elements 35 are evenly spaced, and the six design elements surrounding the specific design element 35a can be the closest design elements 35b with respect to the specific design element 35a located at the center in FIG.

On the other hand, when the overlapping lengths L1 and L2 of the design element 35 (the specific design element 35a and the closest design element 35b) are shorter than the overlapping length L3 of the non-printing unit 36 (L3>L1, L2), the indicator is used. In the corresponding region 30A (the moisture permeable sheet 30), the proportion of the original color (white in the present embodiment) is too high, and as a result, the "instruction" for the observer who observes the diaper 1C from the outside The impression of the color corresponding to the color of the region 30A is more conspicuous than the color of the design element 35 (blue in the present embodiment), and is an impression of a substantially natural color (white color). In this manner, even if the indicator 10 is discolored into blue by contact with a body fluid such as urine, the hue of the blue discolored portion 11 (see FIG. 10(b)) and the outer surface of the discolored portion 11 are covered. The indicator corresponding area 30A (moisture-permeable sheet 30) of the whitish color impression on the side (non-skin facing side) is different, and therefore the visual disappearing effect of the above-described discolored portion 11 cannot be obtained, and Effectively appeal to the observer to pay attention to the replacement period of the diaper 1C.

In view of the fact that the above-described effects are more reliably exhibited, the size and the like of each portion of the printing design in the moisture permeable sheet 30 are preferably set as follows.

The diameter of the design element 35 in a plan view (circular shape) (corresponding to the lengths of the lengths L1 and L2 in FIG. 11) is preferably 0.3 mm or more, more preferably 0.5 mm or more, and further preferably 5 mm or less. Further, it is preferably 4 mm or less, and more specifically, preferably 0.8 to 3 mm, and more preferably 1 to 2 mm.

The overlapping length L3 (see FIG. 11) of the imaginary straight line L and the non-printing portion 36 is preferably 0.2 mm or more, more preferably 0.4 mm or more, and further preferably 4.5 mm or less. It is preferably 3.5 mm or less, and more specifically, preferably 0.5 to 2.5 mm, and more preferably 0.8 to 1.5 mm.

When the lengths L1 and L2 are longer than the length L3 (L3<L1, L2), the ratio of the two (L3/L1 or L3/L2) is preferably 0.2 to 0.9, and more preferably 0.5 to 0.8.

The number of design elements 35 present in the square shape of the square of 1 cm square, that is, the number of the design elements 35 per unit area (printing density) is preferably two or more, more preferably five or more, and more preferably It is 100 or less, more preferably 50 or less, and more specifically, it is preferably 8 to 30, and more preferably 10 to 20. When the printing density of the design element 35 is too high, when the diaper 1C is observed from the outside, the indicator 10 is hidden in the design element 35 and is difficult to distinguish. On the contrary, if the printing density is too low, it may not be sufficiently obtained. The visually disappearing effect of the color changing portion 11 of the above-described indicator 10 is the same.

In the present invention (second invention), the number (printing density) per unit area of the design element 35 may be the same or may be partially different in the entire region of the moisture permeable sheet 30. In particular, when the moisture permeable sheet 30 is disposed over the front side portion A, the lower portion B, and the back side portion C as in the present embodiment, each of the design elements 35 in the front side portion A and the back side portion C The number of unit areas is larger than that of the lower part B (that is, the number of each element area of the design element 35 in the lower part B is smaller than that of the ventral side A and the back side part C), since the ventral side A or the back side part C is usually Since the portion which is easily observed from the outside compared with the lower part B, the observer who observes the diaper 1C from the outside can impress the color of the design element 35 (blue in the embodiment), and can make the observer The impression of the color of the appearance of the diaper 1C leaves an impression of the same color as the color of the design element 35, and as a result, the visual disappearance effect of the discolored portion 11 of the above-described indicator 10 can be sufficiently obtained.

The ratio of the number of the peripheral portion A or the back side portion C to the number of the design elements 35 in the crotch portion B (the ventral side A or the back side portion C) from the viewpoint of making the above-described effects more positively exerted The number of each unit area of the design element 35 / the number of the unit area of the design element 35 in the lower portion B is preferably 1.1 to 2.5, and more preferably 1.2 to 2.0. Furthermore, In the front side portion A and the back side portion C, the number of the design elements 35 per unit area may be the same or different.

As shown in Fig. 8, a portion of the side edge portion of the diaper 1C along the longitudinal direction Y which is located on the outer side of the lateral direction X of the indicator 10 is printed with the indicator 10 in such a manner as to be visible from the outside of the diaper 1C. The color before color change (yellow in the present embodiment) is a mark 15 of the same color or similar color. Here, the similarity between the color of the indicator 10 before the color change and the color of the mark 15 is the same as the color of the color change of the indicator 10 described above and the color of the design element 35. The mark 15 is printed using an ink having water resistance or the like so that it does not change color even when it comes into contact with moisture or body fluid. In the present embodiment, the color (yellow) of the mark 15 and the color (blue) of the color change of the indicator 10 are in a complementary color relationship.

In the present embodiment, the mark 15 is formed in a quadrangular shape in plan view, and the left and right side edges of the diaper 1C in the crotch portion B, more specifically, the left and right sides of the moisture permeable sheet 30 along the longitudinal direction Y A pair of non-skin opposing faces (opposite faces of non-woven fabric 31) are printed. That is, the mark 15 is printed on the same surface as the printing surface of the design element 35 in the moisture permeable sheet 30. The pair of marks 15, 15 are located in the longitudinal direction Y of the diaper 1C at positions which are within 30 mm from the center of the longitudinal direction Y of the diaper 1C, respectively. The position of the longitudinal direction Y of the above-mentioned mark 15 is substantially the same as the position of the longitudinal direction Y of the portion of the diaper 1C where the body fluid such as urine excreted by the wearer is initially received, and is usually the portion where the indicator 10 initially discolors.

If so, the mark 15 of the same color or similar color as the color (yellow) before the discoloration of the indicator 10 is printed on the outer side of the lateral direction X of the indicator 10 (the side edge portion of the diaper 1C) so as to be visible from the outside. Then, when a part of the indicator 10 (particularly, a portion sandwiched by the pair of marks 15 and 15) is discolored into blue by contact with a body fluid such as urine, the color change portion 11 of the blue color and the color change are located. The contrast between the one of the outer sides of the lateral direction X of the portion 11 and the yellow marks 15, 15 allows the observer to more clearly recognize the visual disappearance effect of the discolored portion 11 which is the formation of the discolored portion 11. The degree of the same color or similar color between the color before the color change of the indicator 10 and the mark 15 can be judged by the above-mentioned L*C*h color system, and can be specified by the h value. specific Preferably, the difference (Δh) between the hue value of the color before the color change of the indicator 10 and the h value of the mark 15 (direct measurement) is preferably 0° to 30°, and further preferably set to 0°~20°.

The present invention (second invention) has been described above, but the present invention (second invention) is not limited to the above embodiment and can be appropriately changed. For example, the indicator may be disposed between the back sheet and the absorber in the crotch portion, and the arrangement form (number, plan shape, position, and the like) is not limited to the above embodiment. Further, the shape of the design element is not limited to the dot shape (circular shape) as in the above embodiment, and may be various shapes such as a square shape, a rectangular shape, a rhombic shape, a hexagonal shape, an elliptical shape, and a star shape. . Further, in the above embodiment, all of the plurality of design elements have the same shape, but a plurality of design elements having different shapes may be mixed.

Further, in the above embodiment, the design elements and the marks are printed on the non-skin opposing surface of the moisture permeable sheet (opposite surface with the nonwoven fabric), but may be printed on the opposite side of the skin (paired with the absorbent body) Further, the design elements and the markings may not be printed on the same side of the moisture permeable sheet. Further, the absorbent article of the present invention (second invention) is not limited to the unfolded disposable diaper, and widely includes articles for absorbing liquid discharged from the human body, and also includes pant-type disposable diapers, menstrual sanitary napkins, and physiology. Use underwear and so on.

Only the parts included in the above-described one embodiment can be suitably used in each of the inventions (the first and second inventions) or between the inventions. Regarding the above embodiment, the following absorbent article is further disclosed.

<1>

An absorbent article comprising a vertically long absorbent body comprising a front sheet disposed on a side of the skin facing surface, a back sheet disposed on a non-skin facing side, and disposed on the absorbent sheet The absorber between the two sheets is divided into a belly portion, a back side portion and a crotch portion, and the absorbent body is disposed between the back sheet and the absorber in the longitudinal direction. Notifying the indicator application area of the excreted indicator by a change in color, The absorber includes an absorbing polymer and a cellulose fiber, and the absorbing system includes the absorbing body from the ventral side portion over the back side portion and the skin facing surface of the lower layer absorbing body from the ventral side portion And a main absorption region in which the upper layer absorber overlaps the lower layer absorber and a secondary absorption region other than the main absorption region, and the lower layer absorber belongs to the above-mentioned absorber The basis weight of the above-mentioned absorbing polymer in the region of the main absorption region is greater than the basis of the above-mentioned absorbing polymer in the region of the above-mentioned secondary absorption region, and the basis weight of the above-mentioned absorbing polymer of the above-mentioned upper absorbing body is higher than that of the above-mentioned lower absorbing body The base weight of the polymer is small or the upper layer absorber does not include the above-mentioned absorbent polymer. When the absorbent article is viewed from above, the indicator application region is disposed in the main absorption region, and the longitudinal back side portion of the indicator coating region The end portion of the side is disposed in the vicinity of the end portion on the side of the longitudinal side of the main absorption region.

<2>

The absorbent article according to the above <1>, wherein an end portion of the longitudinal direction side of the indicator application region is disposed in the vicinity of an end portion of the longitudinal absorption side of the main absorption region.

<3>

The absorbent article according to the above <1> or <2>, wherein the end portion of the longitudinal side of the indicator application region on the side of the back side portion is the end portion of the end portion of the longitudinal side of the main absorbent region on the side of the back side portion. The reference is within about one tenth of the length of the longitudinal direction of the main absorption zone.

<4>

The absorbent article according to any one of the above-mentioned items, wherein the end portion of the longitudinal side of the indicator application region is the end portion of the longitudinal side of the main absorption region. The end edge is the reference, and the length of the longitudinal direction of the main absorption region is about ten Within one of the ranges.

<5>

The absorbent article according to any one of the above-mentioned <1> to <4> wherein the position along the longitudinally extending center line in the indicator application region is disposed over the longitudinal rear front edge of the upper absorbent body. a line having an indicator between a line of the indicator and a side edge of the upper side of the upper absorbent body along the longitudinal direction of the upper layer of the absorbent body A line of two indicator agents extending in parallel with the center line in the longitudinal direction is disposed.

<6>

The absorbent article according to any one of the above-mentioned items, wherein the indicator application region is disposed in a longitudinal rear front edge of the upper absorbent body, and the longitudinal back side of the indicator application region The end portion of the portion side is disposed to coincide with the position of the end portion on the side of the longitudinal side of the main absorption region, and the end portion of the longitudinal side of the indicator application region is disposed to be opposed to the main absorption region The positions of the end portions on the ventral side of the longitudinal direction are identical.

<7>

The absorbent article according to any one of the items <1> to <6> wherein the cellulose fibers of the upper layer absorbent are crosslinked cellulose fibers.

<8>

The absorbent article according to any one of the above aspects, wherein the absorbent body and the front sheet are disposed with a hydrophilicity lower than that of the upper absorbent body (not easily compressed). Secondary layer sheet.

<9>

The absorbent article according to the above <8>, wherein the sub-layer sheet is formed in a rectangular shape in a plan view, and is disposed on a skin facing surface of the upper absorbent body of the absorbent body, and is disposed only from the abdominal portion to the lower part of the skin. Not configured on the back side.

<10>

The absorbent article according to the above <8>, wherein the sub-layer sheet has a basis weight of 10 g/m ² or more and 100 g/m ² or less.

<11>

The absorbent article according to any one of the above-mentioned items, wherein the sub-layer sheet is a sheet mainly composed of a hydrophilic fiber and the hydrophilic fiber is contained in an amount of 90% by mass or more. Any of a paper, a non-woven fabric, or a mesh.

<12>

The absorbent article according to any one of the above items, wherein the sub-layer sheet has a compression working amount of 50 g ‧ cm/cm ² or more, 500 g ‧ cm/cm ² or less, preferably 100 g ‧ cm / cm ² or more, 400g‧cm / cm ² or less.

<13>

The absorbent article according to any one of the above aspects, wherein the lower absorbent system is formed by coating a lower absorbent core with a covering material, wherein the liquid permeability of the covering material is lower than that of the upper absorbent body Transparency.

<14>

The absorbent article according to any one of the items <1> to <13> wherein, when the absorbent article is viewed from above, the indicator application region reaches the vicinity of the front end of the upper absorbent body in the longitudinal direction, and is laterally A portion of at least one of the application regions is applied to both side portions of the upper absorbent body.

<15>

The absorbent article according to the above <14>, wherein the rounded indicator in the indicator application region is applied alternately in the longitudinal direction and spaced apart from each other to form a group of the indicator extending in the longitudinal direction, the indicator is coated. The position of one side of the circular shaped indicator on the side in the width direction of the application zone coincides with the position of the side edge of one side of the upper layer absorbent body along the longitudinal direction, and the circular shape indicator on the other side in the width direction The position of the other side coincides with the position of the side edge of the other side of the upper layer absorbent body along the longitudinal direction, and the circle closest to the side of the back side portion The position of the foremost end of the indicator is the same as the position of the edge of the end portion of the longitudinal side of the upper layer absorber, and the position of the lowermost end of the rounded indicator closest to the side of the ventral side The positions of the end edges of the end portions on the ventral side of the longitudinal direction of the upper absorbent body are identical.

<16>

The absorbent article according to the above <14>, wherein the indicator application region is disposed at a position diagonal to the upper layer absorber, and an area containing two lines of the indicator and surrounding the two indicators.

<17>

The absorbent article according to the above <14>, wherein the position of the both sides of the upper absorbent body along the longitudinal direction is along the longitudinal direction of the upper absorbent body The center line is disposed with three lines of indicator extending in the longitudinal direction, and the range of the line surrounding the three indicators is the indicator application area, and the indicator application area is the line of the indicator on one side. The position coincides with the position of the side edge of one side of the upper layer absorber along the longitudinal direction, and the position of the line of the indicator on the other side coincides with the position of the side edge of the other side of the upper layer absorber along the longitudinal direction Further, the position of the line of the three indicator agents closest to the front side of the back side portion coincides with the position of the end edge of the end portion of the longitudinal side of the upper layer absorbent body, and is closest to the lower end side of the ventral side portion. The position coincides with the position of the end edge of the end portion on the ventral side of the longitudinal direction of the upper absorbent body.

<18>

The absorbent article according to any one of the above aspects, wherein the upper absorbent system is formed only by the upper absorbent core, and the base absorbent core has a basis weight of 50 g/m ² or more and 500 g. /m ² or less.

<19>

The absorbent article according to any one of the above aspects, wherein the lower absorbent system uses one of the covering materials, and folds both side portions of the covering material such that the side edges of the covering material are mutually The side of the non-skin facing side (back sheet side) of the lower absorbent core overlaps Formed by wrapping the lower absorbent core.

<20>

The absorbent article according to the above <19>, wherein the basis weight of the lower absorbent core is 100 g/m ² or more and 1000 g/m ² or less, and the basis weight of the covering material is 3 g/m ² or more and 20 g/m ^{2 .} the following.

<21>

The absorbent article according to the above <19>, wherein the absorbing polymer in the region of the lower absorbent core in the region of the main absorbent region has a basis weight of 50 g/m ² or more and 500 g/m ² or less. Preferably, it is 100 g/m ² or more and 400 g/m ² or less, and the basis weight of the cellulose fibers in the region of the lower absorbent core in the region of the main absorption region is 0 g/m ² or more and 300 g/m ^{2 .} Hereinafter, it is preferably 0 g/m ² or more and 200 g/m ² or less.

<22>

The absorbent article according to any one of the above-mentioned <19>, wherein the absorbing polymer having a basis weight in the region of the sub-absorption region of the lower absorbent core has a basis weight of 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, and the basis weight of the cellulose fibers in the region of the lower absorbent core in the region corresponding to the secondary absorption region is 0 g/m ² or more. It is 250 g/m ² or less, preferably 0 g/m ² or more and 200 g/m ² or less.

<23>

The absorbent article of any one of the above-mentioned <19> to <22> wherein the basis weight of the absorbing polymer in the region of the lower absorbent core which belongs to the main absorbing region is higher than that in the lower absorbent core The basis of the absorbing polymer in the region belonging to the above-mentioned secondary absorption region is 10 g/m ² or more, preferably 20 g/m ² or more.

<24>

The absorbent article according to any one of the above aspects, wherein the absorbent polymer contained in the absorbent body has a water absorption amount of 10 g/g or more and 50 g/g or less. It is preferably 15 g/g or more and 30 g/g or less.

<25>

The absorbent article according to any one of the above aspects, wherein the absorption amount of the absorbing polymer under pressure of 2.0 kPa is 10 g/g or more and 50 g/g or less, preferably 15 g/g. Above, 30g/g or less.

<26>

The absorbent article according to any one of the above aspects, wherein the absorption polymer has a liquid permeation rate under pressure of 2.0 kPa of 5 ml/min or more and 150 ml/min or less, and is 10 ml/min. Above, below 120ml/min.

<27>

The absorbent article according to any one of the above aspects, wherein the absorption rate of the absorbing polymer measured by the DW method is 10 ml/(g ‧ 10 minutes) or more, and 100 ml / (g ‧ 10 minutes) The following is preferably 20 ml/(g‧10 minutes) or more and 70 ml/(g‧10 minutes) or less.

<28>

The absorbent article according to any one of the above items, wherein the absorption rate of the absorbent polymer measured by the DW method is 3 ml/(g‧1 minute) or more, 30 ml/(g‧1 minute) The following is preferably 5 ml/(g‧1 minute) or more and 20 ml/(g‧1 minute) or less.

<29>

The absorbent article according to any one of the above-mentioned items, wherein the absorbent polymer is capable of absorbing and retaining a liquid which is 20 times or more of its own weight and capable of gelling, and has an average particle diameter of The particle shape of 10 μm or more and 1000 μm or less, preferably 100 μm or more and 800 μm or less, is any one of a plurality of shapes of a spherical shape, a block shape, a grape shape, and a grass bag shape.

<30>

The absorbent article according to any one of the above aspects, wherein the liquid permeable time of the covering material constituting the lower layer absorbent body is delayed by 5 seconds or longer, more preferably delayed, than the liquid passage time of the upper layer absorbent body. More than 8 seconds.

<31>

The absorbent article according to any one of the above aspects, wherein the covering material constituting the lower absorbent body is a hydrophilic sheet, and the hydrophilic sheet is made of a tissue paper (toilet paper) containing water permeability or Water-permeable non-woven fabric package.

<32>

The absorbent article according to any one of the above aspects, wherein the upper absorbent core is formed as an upper absorbent core and the lower absorbent core is formed into a rectangular shape, and the upper absorbent core is formed. The length of the longitudinal direction of the system is shorter than the lower absorbent core and the length in the width direction is shorter than the lower absorbent core.

<33>

The absorbent article according to any one of the above aspects, wherein the upper absorbent core is formed in a rectangular shape, and the lower absorbent core system is formed in the lower layer. The shape, the longitudinal length of the upper absorbent core is shorter than the lower absorbent core, and the length in the width direction is in the lower portion of the crotch in which the upper absorbent core is equal to the lower absorbent core.

<34>

The absorbent article according to any one of the above aspects, wherein a hydrophilic and liquid-permeable non-woven fabric is used as the front sheet, and liquid impervious or water-repellent is used as the back sheet. A resin film or a laminate of the resin film and the nonwoven fabric.

<35>

The absorbent article according to any one of the above aspects, comprising the absorbent body and a back sheet disposed on the non-skin opposing side of the absorbent body, having a wearer equivalent The longitudinal direction of the front-rear direction and the transverse direction orthogonal thereto, and the longitudinal direction includes a belly side portion disposed on the abdomen side of the wearer when worn, a lower portion disposed on the crotch portion of the crotch portion, and a back side portion disposed on the back side, The back sheet has a laminated structure of a moisture permeable sheet and a non-woven fabric, and an indicator which is discolored by contact with moisture or body fluid is disposed between the back sheet and the absorber in the crotch portion, and the indicator The color before and after the color change is different from the natural color of the moisture permeable sheet and the non-woven fabric, and the indicator corresponding to the indicator in the thickness direction of the absorbent article in the moisture permeable sheet overlaps In a region of a square shape of 1 cm square, there are a plurality of design elements printed in the same color or similar color as the color of the indicator, and the plurality of design elements are respectively surrounded by a non-printing portion that is not printed. Setting any one of the plurality of design elements in the indicator corresponding region as a specific design element, and presenting one of the positions closest to the specific design element When the design element is closest to the design element and an imaginary line passing through the center of the specific design element and the closest design element is drawn, the length L1 of the overlapping portion of the imaginary line with the specific design element and the imaginary The length L2 of the overlapping portion of the straight line with the closest design element is equal to or longer than the length L3 of the overlapping portion of the imaginary straight line with the non-printing portion sandwiched by the specific design element and the closest design element. This length is L3.

<36>

The absorbent article according to the above <35>, wherein the above-mentioned design elements are printed in a regular pattern in a scatter pattern.

<37>

The absorbent article according to the above <35> or <36>, wherein the plurality of design elements and the printing design surrounding the non-printing portions are performed throughout the entire area of the moisture-permeable sheet.

<38>

The absorbent article according to any one of the aspects of the present invention, wherein the moisture-permeable sheet is disposed over the front side portion, the crotch portion, and the back side portion, the front side portion and the back side portion The number of units per unit area of the above design elements is greater than that of the lower part.

<39>

The absorbent article according to any one of the above aspects, wherein the absorbent system comprises an absorbent core and a coated core material opposite to the skin facing the non-skin facing surface of the absorbent core. On the other hand, the coated core material on the facing side of the skin is a hydrophilic non-woven fabric, and the non-skin facing side of the coated core material is a hydrophobic non-woven fabric.

<40>

The absorbent article according to the above <39>, wherein the packaged chip material comprises: a first package of a core material covering a skin facing surface of the absorbent core; and a second package of a core material covering the absorbent core The non-skin facing surface is rolled up to the side edge of the skin facing surface in the longitudinal direction; the absorbent core and the packaged core material are joined by a hot melt adhesive.

<41>

The absorbent article according to any one of the items <35> to <40> wherein the absorbent article is an unfoldable disposable diaper.

<42>

The absorbent article according to any one of the items <35> to <41> wherein the absorbent article is formed by bending the upper side of the crotch portion in an arc shape inward in the longitudinal direction, and has a longitudinal direction in a plan view. The central portion is tapered toward the inner side in the shape of an hourglass.

<43>

The absorbent article according to any one of the above-mentioned <35>, wherein the waist elastic member is extended in the front-rear direction from the front end edge of the absorbent body before the longitudinal direction Each of the legs constituting the waist portion is fixed in an extended state, and each of the leg members extending in the lateral direction from the left and right side edges of the absorbent body in the longitudinal direction is fixed in an extended state to the two legs constituting the leg portion. Between the sheets, three-dimensional protection is respectively disposed on the left and right sides of the longitudinal sheet side of the absorbent article, and the three-dimensional protective elastic member is fixed to the free end of the three-dimensional protection in an extended state to wear the absorbent article. At the time, the three-dimensional wrinkles are formed by the contraction of the three-dimensional protective elastic member.

<44>

The absorbent article according to any one of the above-mentioned <35>, wherein a pair of fastening tapes are provided on both side edges of the back side portion along the longitudinal direction, and the adhesive tape is mounted to include mechanical properties. a fixing portion of the male member of the planar fastener, wherein a fixed region of the female member including the mechanical surface fastener is formed on the non-skin opposing surface of the abdominal portion, and the fixed region is utilized The joining mechanism is formed by joining and fixing the female member to the non-skin opposing surface of the back sheet, and detachably fixing the fixing portion of the fastening tape.

<45>

The absorbent article according to any one of the above aspects, wherein the moisture-permeable sheet and the non-woven fabric have a white color, and the color of the indicator before discoloration and the color after discoloration pass through the back surface. The sheet is visible through the passage and can be seen from the outside of the absorbent article.

<46>

The absorbent article according to any one of the items <35> to <45> wherein the indicator is yellow before discoloration (before contact with moisture or body fluid), blue after discoloration, and before and after discoloration of the indicator Color is the relationship of complementary colors.

<47>

The absorbent article according to any one of <35> to <46> wherein the above indication The agent is provided in a straight line extending in the longitudinal direction at a central portion of the lateral direction of the absorbent article, and extends over the entire longitudinal direction of the crotch portion to extend to the abdominal portion and the back portion. The length of the indicator in the longitudinal direction is 100~400mm, and the length in the lateral direction is 1~10mm.

<48>

The absorbent article according to any one of the items <35>, wherein the indicator comprises a hydrophilic composition comprising a color-changing substance which changes visually by contact with moisture, And an adhesive substance that functions as an adhesive, the indicator agent having a function as an indicator means for notifying the excretion of the body fluid of the wearer to the observer, and also as an interface between the back sheet and the absorber The function of the joint mechanism.

<49>

The absorbent article according to the above <48>, wherein the color-changing substance is a pH indicator which is discolored when the color changes after the contact with the urine and the pH is 3 to 7.

<50>

The absorbent article according to the above <49>, wherein the pH indicator is selected from the group consisting of bromophenol blue, methyl orange, alizarin S, bromocresol green, methyl red, bromocresol purple and resazurin. One or more of the group.

<51>

The absorbent article according to any one of the above aspects, wherein the adhesive substance is hydrophilic which functions as an adhesive for bonding the back sheet and the absorber before contact with moisture. The polymer, the hydrophilic polymer is one or more selected from the group consisting of polyethylene glycol, polypropylene glycol, polyvinyl alcohol, polyamidamine, and vinyl pyrrolidone homopolymer.

<52>

The absorbent article according to any one of the above-mentioned items, wherein the plurality of the above-mentioned design elements are respectively formed in a plan view (circular shape), and are printed in a regular pattern on the moisture-permeable sheet in a regular pattern. And a plurality of the design elements are uniform in size, and the plurality of design elements and the printing design surrounding the non-printing portions are implemented throughout the non-skin opposing surface of the moisture permeable sheet, and the indicator is applied to the indicator The printing area (the above-described printing design) of the above-described design elements is the same in the corresponding region and the other portions of the moisture-permeable sheet.

<53>

The absorbent article according to any one of the items <35>, wherein the color of the plurality of design elements printed on the moisture permeable sheet and the color before the color change of the indicator are complementary colors.

<54>

The absorbent article according to any one of the items <35> to <53> wherein the color of the indicator before and after the color change is a complementary color.

<55>

The absorbent article according to the above <53>, wherein the plurality of the design elements printed on the moisture permeable sheet are each blue or a similar color, and the color of the indicator before the discoloration is yellow.

<56>

The absorbent article according to any one of the items <35> to <55> wherein the difference between the hue angle of the color of the indicator and the h-value of the color of the design element (direct measurement) (Δh) is 0°~30°.

<57>

The absorbent article according to any one of the above-mentioned <35>, wherein the diameters L1 and L2 of the design element 35 in a plan view (circular shape) are preferably 0.3 mm or more and 5 mm. In the following, it is preferably 4 mm or less, and the overlapping length L3 of the imaginary straight line and the non-printing portion is preferably 0.2 mm or more and 4.5 mm or less, and the diameters L1 and L2 are longer than the length L3 (L3<L1). In the case of L2), the ratio of the two (L3/L1 or L3/L2) is 0.2 to 0.9.

<58>

The absorbent article according to any one of the items <35> to <57> wherein the number of the above-mentioned design elements (the number of the above-mentioned design elements per unit area (printing density)) is present in a square shape of a square of 1 cm square Two or more and 100 or less.

<59>

The absorbent article according to any one of the items <35> to <58> wherein the ratio of the number of per unit areas of the ventral side portion or the back side portion to the design element in the crotch portion (the ventral side portion or The number of per unit areas of the design elements in the back side/the number of design elements per unit area in the lower part is 1.1 to 2.5.

<60>

The absorbent article according to any one of the above-mentioned <35>, wherein the portion of the side edge portion of the absorbent article along the longitudinal direction is located at a laterally outer side of the indicator to be self-absorptive The manner in which the exterior of the article is seen is printed with a mark of the same color or a similar color as the color of the indicator before discoloration.

<61>

The absorbent article according to the above <60>, wherein the difference (Δh) between the color of the color of the indicator before the color change of the indicator and the h value of the mark (direct measurement) is 0° to 30°.

<62>

The absorbent article according to any one of the items <1> to <61> wherein the absorbent article is a disposable diaper.

<63>

A disposable diaper according to the above <62>, wherein the disposable diaper-expandable disposable diaper has leg pleats and three-dimensional pleats.

[Industrial availability]

According to the absorbent article of the invention (first invention), the indicator is easily and accurately discolored, and the accuracy of the replacement period is improved. In the absorbent article according to the present invention (first invention), the body fluid such as urination is less likely to leak from the lower portion of the absorbent article without missing the replacement period.

According to the present invention (second invention), an absorbent article which is excellent in appearance and which is easy to distinguish a visual change of an indicator from the outside is provided.

1A‧‧‧ diapers

2‧‧‧Front sheet

3‧‧‧Back sheet

4‧‧‧Acceptor

4E‧‧‧ absorption area

4Ma‧‧‧End

4Mb‧‧‧ end

6‧‧‧ indicator

41‧‧‧lower absorber

42‧‧‧Upper absorber

60‧‧‧ indicator coating area

60a‧‧‧End

60b‧‧‧End

411‧‧‧lower absorbent core

412‧‧‧Covered timber

421‧‧‧Upper absorbent core

Y‧‧‧ portrait

Claims (63)

An absorbent article comprising a vertically long absorbent body comprising a front sheet disposed on a side of the skin facing surface, a back sheet disposed on a non-skin facing side, and disposed on the absorbent sheet The absorber between the two sheets is divided into a belly portion, a back side portion and a crotch portion, and the absorbent body is disposed between the back sheet and the absorber in the longitudinal direction. The indicator application region of the indicator for excretion is notified by a change in color, wherein the absorber comprises an absorbent polymer and a cellulose fiber, and the absorption system comprises an absorbent body disposed from the abdominal portion over the back portion and disposed a main absorption region in which the upper layer absorber overlaps the lower layer absorber, and the upper layer absorber is disposed on the skin facing surface of the lower layer absorber from the upper side portion to the upper layer of the lower layer absorber. a sub-absorption region other than the main absorption region, wherein the basis weight of the absorbing polymer in the region of the lower absorbing body belonging to the main absorbing region is higher than the absorption in the region belonging to the sub-absorption region The basis of the composition is such that the basis weight of the absorbing polymer of the upper layer absorber is smaller than the basis weight of the absorbing polymer of the lower layer absorber, or the upper layer absorber does not contain the absorbing polymer, and the absorbent article is viewed from above. In the meantime, the indicator application region is disposed in the main absorption region, and an end portion on the back side portion side in the longitudinal direction of the indicator application region is disposed in the vicinity of the end portion on the back side portion side in the longitudinal direction of the main absorption region. The absorbent article according to claim 1, wherein an end portion of the longitudinal direction side of the indicator application region is disposed in the vicinity of an end portion of the longitudinal absorption side of the longitudinal direction of the main absorption region. The absorbent article according to claim 1 or 2, wherein the end portion of the longitudinal side of the indicator application region on the side of the back side portion is based on the edge of the end portion of the longitudinal side of the main absorbent region on the side of the back side portion, and Located within about one tenth of the length of the longitudinal direction of the primary absorption zone. The absorbent article according to claim 1 or 2, wherein the end portion on the ventral side of the longitudinal direction of the indicator application region is based on the end edge of the end portion of the longitudinal side of the main absorption region, and Located within about one tenth of the length of the longitudinal direction of the primary absorption zone. The absorbent article according to claim 1 or 2, wherein an indicator is disposed throughout the longitudinal rear front edge of the upper absorbent body along a position of a longitudinally extending center line in the indicator application region a line disposed between the line of the indicator and the side edges of the upper side of the upper absorbent body in the longitudinal direction of the upper layer of the absorbent body; The line of two indicator lines extending in parallel with the center line. The absorbent article of claim 1 or 2, wherein the indicator application region is disposed in a longitudinal direction of the front end edge of the upper absorbent body, and an end portion of the longitudinal side of the indicator application region is disposed to be The end portion on the side of the longitudinal side of the longitudinal direction of the indicator application region is disposed in correspondence with the position of the end portion on the side of the longitudinal side of the main absorption region, and the end portion of the longitudinal side of the main absorption region is disposed The positions of the ends are the same. The absorbent article of claim 1 or 2, wherein the cellulose fibers of the above upper absorbent body are crosslinked cellulose fibers. The absorbent article according to claim 1 or 2, wherein a hydrophilic sub-layer sheet having a compression work amount lower than that of the upper layer absorbent body (which is not easily compressed) is disposed between the absorbent body and the front sheet. The absorbent article of claim 8, wherein the sub-layer sheet is rectangular in plan view. The skin facing surface of the upper absorbent body fixed to the absorbent body is disposed on the skin facing surface only from the abdominal side portion, and is not disposed on the back side portion. The absorbent article according to claim 8, wherein the sub-layer sheet has a basis weight of 10 g/m ² or more and 100 g/m ² or less. The absorbent article according to claim 8, wherein the sub-layer sheet is a sheet mainly composed of a hydrophilic fiber and the hydrophilic fiber is contained in an amount of 90% by mass or more, and the sheet is in a paper, a non-woven fabric, or a mesh. Either. The absorbent article according to claim 8, wherein the sub-layer sheet has a compression working amount of 50 g‧cm/cm ² or more and 500 g‧cm/cm ² or less. The absorbent article according to claim 1 or 2, wherein the lower absorbent system is formed by coating a lower absorbent core with a covering material, and the liquid permeability of the covering material is lower than a liquid permeability of the upper absorbent body. The absorbent article according to claim 1 or 2, wherein, in a plan view of the absorbent article, the indicator application region reaches the vicinity of the front end of the upper absorbent body in the longitudinal direction, and is at least a portion of the coating region in the lateral direction. It is applied to both side portions of the above upper absorbent body. The absorbent article of claim 14, wherein the rounded shape indicator in the indicator application area is alternately applied to the left and right in the longitudinal direction and spaced apart to form a group of the indicator extending in the longitudinal direction, the indicator coating The position on one side of the circular shape indicator on the square side in the width direction of the region is coincident with the position of the side edge of one side of the upper layer absorber along the longitudinal direction, and the other one of the circular shape indicators on the other side in the width direction The position of one side coincides with the position of the side edge of the other side of the upper layer absorbent body along the longitudinal direction, and the position of the front end of the circular shaped indicator closest to the side of the back side portion and the longitudinal direction of the upper layer absorber The positions of the end edges of the end portions on the back side are the same, and the position of the lowermost end of the circular shaped indicator closest to the side of the front side and the upper absorbent body The positions of the end edges of the end portions on the ventral side of the longitudinal direction are identical. The absorbent article according to claim 14, wherein the indicator application region is disposed at a position diagonal to the upper absorbent member, and an area containing two lines of the indicator and surrounding the two indicators. The absorbent article of claim 14, wherein the position of the both sides of the upper absorbent body along the longitudinal direction and the longitudinal extension of the upper absorbent body in the indicator application region The position of the line is arranged with three lines of indicator extending in the longitudinal direction, and the range of the line surrounding the three indicators is the above-mentioned indicator coating area, and the indicator coating area is the position of the line of the indicator on one side. Consistent with the position of the side edge of one side of the upper absorbent body along the longitudinal direction, the position of the line of the indicator on the other side coincides with the position of the side edge of the other side of the upper layer absorbent body along the longitudinal direction, Further, the position of the line of the three indicator agents closest to the front end side of the back side portion coincides with the position of the end edge of the end portion of the longitudinal side of the upper layer absorbent body, and is closest to the lower end side of the ventral side portion. The position coincides with the position of the end edge of the end portion on the ventral side of the longitudinal direction of the upper absorbent body. The absorbent article according to claim 1 or 2, wherein the upper absorbent system is formed only of the upper absorbent core, and the upper absorbent core has a basis weight of 50 g/m ² or more and 500 g/m ² or less. The absorbent article of claim 1 or 2, wherein the lower absorbent system uses one coated material, and the both sides of the coated material are folded so that the side edges of the coated material are opposite to each other in the lower absorbent core. The lower absorbent core is formed by overlapping the skin facing side (back sheet side). The absorbent article according to claim 19, wherein the basis weight of the lower absorbent core is 100 g/m ² or more and 1000 g/m ² or less, and the basis weight of the covering material is 3 g/m ² or more and 20 g/m ² or less. . The absorbent article according to claim 19, wherein the absorbent polymer of the region of the lower absorbent core in the region of the main absorbent region has a basis weight of 50 g/m ² or more and 500 g/m ² or less, and the lower absorbent layer. The basis weight of the cellulose fibers in the region belonging to the main absorption region in the core is 0 g/m ² or more and 300 g/m ² or less. The absorbent article according to claim 19, wherein the basis weight of the absorbing polymer in the region of the lower absorbent core in the region of the secondary absorption region is 20 g/m ² or more and 400 g/m ² or less, and the lower layer is absorbent. The basis weight of the cellulose fibers in the region belonging to the secondary absorption region in the core is 0 g/m ² or more and 250 g/m ² or less. The absorbent article of claim 19, wherein a basis weight of the absorbing polymer in the region of the lower absorbent core which belongs to the main absorbing region is higher than that in the region of the lower absorbent core which belongs to the secondary absorbing region The basis weight of the polymer is 10 g/m ² or more, preferably 20 g/m ² or more. The absorbent article according to claim 1 or 2, wherein the absorbent polymer contained in the absorbent body has a water absorption amount of 10 g/g or more and 50 g/g or less. The absorbent article according to claim 1 or 2, wherein the absorption amount under pressure of 2.0 kPa of the above absorbent polymer is 10 g/g or more and 50 g/g or less. The absorbent article according to claim 1 or 2, wherein a liquid permeation rate under pressure of 2.0 kPa of the above absorbent polymer is 5 ml/min or more and 150 ml/min or less. The absorbent article according to claim 1 or 2, wherein the absorption rate of the absorbent polymer measured by the DW method is 10 ml/(g‧10 minutes) or more and 100 ml/(g‧10 minutes) or less. The absorbent article according to claim 1 or 2, wherein the absorption rate of the absorbent polymer measured by the DW method is 3 ml/(g‧1 minute) or more and 30 ml/(g‧1 minute) or less. The absorbent article according to claim 1 or 2, wherein the absorbent polymer is capable of absorbing and retaining a liquid of 20 times or more of its own weight and capable of gelling, and has an average particle diameter of 10 Å and 1000 Å. The shape of the particle, the shape of the particle Any of a variety of shapes including spheres, blocks, grapes, and straws. The absorbent article according to claim 1 or 2, wherein a liquid permeation time of the covering material constituting the lower absorbent body is delayed by 5 seconds or longer, more preferably 8 seconds or longer, than a liquid permeation time of the upper absorbent body. The absorbent article according to claim 1 or 2, wherein the covering material constituting the lower absorbent body is a hydrophilic sheet, and as the hydrophilic sheet, a coated core material comprising a water-permeable tissue (toilet paper) or a water-permeable nonwoven fabric is used. The absorbent article of claim 1 or 2, wherein the upper absorbent core of the upper absorbent layer and the lower absorbent core of the lower absorbent body are formed in a rectangular shape, and the length of the upper absorbent core system is shorter than the length The lower absorbent core has a length in the width direction that is shorter than the lower absorbent core. The absorbent article according to claim 1 or 2, wherein the upper absorbent core is formed into a rectangular shape, and the lower absorbent core is formed into a shape in which the lower absorbent core system is tapered in the lower portion of the lower absorbent core. The longitudinal length of the body is shorter than the lower absorbent core, and the length in the width direction is in the lower portion of the crotch where the upper absorbent core is equal to the lower absorbent core. The absorbent article according to claim 1 or 2, wherein a hydrophilic and liquid permeable non-woven fabric is used as the front sheet, and a liquid impervious or water-repellent resin film or a resin film and a non-woven fabric are used as the back sheet. The layered body. The absorbent article according to claim 1 or 2, comprising an absorbent body and a back sheet disposed on the non-skin opposing side of the absorbent body, having a longitudinal direction corresponding to a front and rear direction of the wearer and a transverse direction orthogonal thereto. And in the longitudinal direction, the abdominal side portion disposed on the abdominal side of the wearer when worn, the lower portion disposed on the crotch portion of the crotch portion, and the back side portion disposed on the back side, the back sheet having the moisture-permeable sheet and the non-woven fabric a laminated structure in which the back sheet and the absorber are disposed between the back sheet and the absorber Or an indicator for discoloration by contact with body fluid, wherein the color of the indicator before and after discoloration is different from the natural color of the moisture permeable sheet and the non-woven fabric, and the thickness direction of the absorbent article in the moisture permeable sheet The indicator corresponding region overlapping the indicator agent is printed with a plurality of design elements having the same color or similar color as the color of the indicator in a plurality of square shapes in a square shape of 1 cm square. Each of the design elements is surrounded by a non-printing unit that is not printed, and any one of the plurality of design elements in the indicator corresponding region is a specific design element, and is present at a position closest to the specific design element. When one is set to the closest design element and an imaginary line passing through the center of the specific design element and the closest design element is drawn, the length of the overlapping portion of the imaginary line with the specific design element (L1) And the length (L2) of the overlapping portion of the imaginary line with the closest design element and the sum of the imaginary line and the specific The gauge element is equal to or longer than the length (L3) of the overlapping portion of the non-printing portion sandwiched by the closest design element. The absorbent article of claim 35, wherein the design elements are printed in a regular pattern in a pattern. The absorbent article of claim 35, wherein the plurality of design elements and the print design surrounding the non-printing portions surrounding the materials are applied throughout the entire area of the moisture-permeable sheet. The absorbent article according to claim 35, wherein the moisture permeable sheet is disposed over the front side portion, the crotch portion, and the back side portion, and each unit area of the design element in the front side portion and the back side portion The number is more than the lower part of the coffin. The absorbent article according to claim 35, wherein the absorbent system comprises an absorbent core and a coated core material which is coated on the opposite surface of the skin and the non-skin facing surface of the absorbent core, respectively. The packaged chip material is a hydrophilic non-woven fabric. The non-skin facing side of the packaged chip material is a hydrophobic non-woven fabric. The absorbent article of claim 39, wherein the packaged core material comprises: a first package of a core material covering a skin facing surface of the absorbent core; and a second package of a core material covering the absorbent core The non-skin facing surface is rolled up to the side edge of the skin facing surface in the longitudinal direction; the absorbent core and the packaged core material are joined by a hot melt adhesive. The absorbent article of claim 35, wherein the absorbent article is an unfolded disposable diaper. The absorbent article according to claim 35, wherein the absorbent article is formed such that the lower side of the crotch portion is curved in an arc shape inward in the longitudinal direction, and the central portion of the longitudinal direction is tapered toward the inner side in a plan view. The shape of an hourglass. The absorbent article of claim 35, wherein the waist elastic member is fixed in an elongated state between the two sheets constituting the waist portion in each of the waist portions extending from the front end edge of the absorbent body in the front-rear direction. Each of the leg portions of the absorbent body extending in the lateral direction along the left and right side edges of the longitudinal direction, the leg elastic members are fixed in an extended state between the two sheets constituting the leg portion, in the side of the front sheet side of the absorbent article The left and right sides of the longitudinal direction are respectively provided with three-dimensional protection, and the three-dimensional protective elastic member is fixed to the free end of the three-dimensional protection in an extended state, and when the absorbent article is worn, the three-dimensional wrinkles are formed by the contraction of the three-dimensional protective elastic member. The absorbent article of claim 35, wherein a pair of fastening tapes are disposed on both side edges of the back side portion along the longitudinal direction, and the fastening tape is mounted with a male member including a mechanical surface fastener. a fixing portion in which a non-skin opposing surface of the front side portion is formed with a fixing portion of a female member including a mechanical surface fastener, and the fixed region is a mating mechanism The type member is joined and fixed to the non-skin opposing surface of the back sheet, and the fixing portion of the fastening tape is detachably fixed. The absorbent article of claim 35, wherein the moisture-permeable sheet and the non-woven fabric have a white color, and the color before the color change of the indicator and the color after the color change are visible through the back sheet. It can be seen from the outside of the above absorbent article. The absorbent article according to claim 35, wherein the indicator is yellow before discoloration (before contact with moisture or body fluid) and blue after discoloration, and the color of the indicator before and after discoloration is a complementary color. The absorbent article according to claim 35, wherein the indicator is provided in a straight line extending in the longitudinal direction at a central portion of the lateral direction of the absorbent article, and extends over the entire longitudinal direction of the crotch portion, and further extends The length of the indicator in the longitudinal direction is 100 to 400 mm and the length in the lateral direction is 1 to 10 mm to the portion of the front side portion and the back side portion adjacent to the lower portion of the crotch portion. The absorbent article of claim 35, wherein the indicator comprises a hydrophilic composition comprising a color-changing substance that visually changes by contact with moisture, and an adhesive functioning as an adhesive In addition to the function of the indicator mechanism for notifying the excretion of the body fluid of the wearer to the observer, the indicator has a function as a joint mechanism for joining the back sheet and the absorber. The absorbent article according to claim 48, wherein the color changing substance is a pH indicator which is a color change when the color changes after the contact with the urine and the pH is 3 to 7. The absorbent article of claim 49, wherein the pH indicator is selected from the group consisting of bromophenol blue, methyl orange, alizarin S, bromocresol green, methyl red, bromocresol purple and resazurin One or more of the group consisting of. The absorbent article according to claim 48, wherein the adhesive substance is a hydrophilic polymer which functions as an adhesive for bonding the back sheet and the absorbent body before contact with moisture, and the hydrophilic polymerization is carried out. The system is one or more selected from the group consisting of polyethylene glycol, polypropylene glycol, polyvinyl alcohol, polyamidamine, and vinyl pyrrolidone homopolymer. The absorbent article of claim 35, wherein the plurality of the above-mentioned design elements are respectively formed in a plan view (circular shape), and are printed in a regular pattern on the moisture-permeable sheet in a regular pattern, and the plurality of the design elements are uniform in size. a printing design including a plurality of the above-mentioned design elements and the non-printing unit surrounding the plurality of design elements, and the entire area of the non-skin opposing surface of the moisture permeable sheet, and the indicator corresponding region and the moisture permeable sheet In addition to the above, the print design of the above design elements (the above print design) is the same. The absorbent article of claim 35, wherein the color of the plurality of design elements printed on the moisture permeable sheet and the color before the color change of the indicator are complementary colors. The absorbent article of claim 35, wherein the color of the indicator before and after the color change is a complementary color. The absorbent article of claim 53, wherein the plurality of design elements printed on the moisture permeable sheet are respectively blue or a similar color, and the color of the indicator before discoloration is yellow. The absorbent article of claim 35, wherein the difference between the hue angle of the color of the indicator and the h-value of the color of the design element (direct measurement) (Δh) is 0° to 30°. The absorbent article according to claim 35, wherein the diameters L1 and L2 of the design element 35 in a plan view (circular shape) are 0.3 mm or more and 5 mm or less. The overlapping length (L3) of the imaginary straight line with the non-printing portion is 0.2 mm or more and 4.5 mm or less, and the diameters (L1) and (L2) are longer than the length (L3) (L3<L1, L2). The ratio of the two (L3/L1 or L3/L2) is 0.2 to 0.9. The absorbent article according to claim 35, wherein the number of the above-mentioned design elements (the number of the above-mentioned design elements per unit area (printing density)) is 2 or more and 100 or less in the area of the square shape of 1 cm square. The absorbent article of claim 35, wherein the ratio of the number of per unit areas of the ventral side portion or the back side portion to the design element in the crotch portion (each of the design elements in the ventral side portion or the back side portion) The number of units per unit / the number of design elements per unit area in the lower part is 1.1 to 2.5. The absorbent article of claim 35, wherein a portion of the side edge portion of the absorbent article along the longitudinal direction which is located laterally outward of the indicator is printed in such a manner as to be visible from the outside of the absorbent article The color before the discoloration of the indicator is a mark of the same color or a similar color. The absorbent article of claim 60, wherein the difference (Δh) between the color of the color of the indicator before the color change of the indicator and the h value of the mark (directly measured) is 0° to 30°. The absorbent article of claim 1 or 2, wherein the absorbent article is a disposable diaper. The disposable diaper of claim 62, wherein the disposable diaper is an unfolded diaper having leg pleats and three-dimensional pleats.