WO2013187376A1

WO2013187376A1 - Absorption body for absorptive article, and absorptive article with same

Info

Publication number: WO2013187376A1
Application number: PCT/JP2013/065986
Authority: WO
Inventors: 繁宏松原; 和田　正
Original assignee: 花王株式会社
Priority date: 2012-06-11
Filing date: 2013-06-10
Publication date: 2013-12-19
Also published as: JP2014014667A

Abstract

An absorption body has a single layer structure portion (10). The absorption body is divided into a first absorption section (11), which is located at the center, and into a second absorption section (12) and a third absorption section (13), which extend in the longitudinal direction from the first absorption section (11). The basis weight of a highly absorptive polymer present in the second absorption section (12) is higher than the basis weight of a highly absorptive polymer present in the third absorption section (13). A first recess (21) extending in one direction is formed in the surface of the first absorption section (11). Ends of the first recess (21) do not reach the side edges of the absorption body (10), and the direction of extension of the first recess (21) is aligned with the longitudinal direction of the absorption body (10). A second recess (221) is formed in the surface of the second absorption section (12), and the second recess (221) continues from at least the first recess (21) and extends in the longitudinal direction of the absorption body (10).

Description

[Replenishment under Rule 26 20.06.2013] Absorbent of absorbent article and absorbent article provided with the same

The present invention relates to an absorbent body used for absorbent articles such as disposable diapers. Moreover, this invention relates to absorbent articles, such as a disposable diaper provided with this absorber.

In absorbent articles such as disposable diapers, the structure and constituent materials of the absorber have been variously improved to improve their functions. For example, in Patent Document 1, regarding the structure of the absorbent body, the absorbent gelling material contained in the absorbent body is arranged in such a manner that at least 75% of the absorbent gelling substance is found in the front 2/3 portion of the absorbent article. It is described.

Similarly, regarding the structure of the absorbent body, Patent Document 2 discloses that an abdominal panel, a crotch panel, a back panel, and an outer edge panel that can be bent between panels are arranged at intervals, and each panel is composed of one sheet as a whole. An absorbent core held as an absorbent core panel is described.

Japanese Patent Laid-Open No. 2-5945 JP 2004-49507 A

In the technique described in Patent Document 1, due to uneven distribution of the absorbent gelling material at a specific site, the granular feeling of the absorbent gelling material becomes excessively high and is perceived by the wearer. It becomes easy. As a result, a good wearing feeling may not be obtained.

In the technique described in Patent Document 2, when a absorbent article is worn, if a gap is formed between the skin and the bent portion between the panels, liquid leakage may occur through the gap. Furthermore, a sense of incongruity may occur in the wearing state due to the gap.

The present invention relates to an absorbent body of an absorbent article that can eliminate the drawbacks of the prior art described above and an absorbent article having the absorbent body.

The present invention is an absorbent article absorbent article comprising pulp and a superabsorbent polymer, having a longitudinal direction and a width direction perpendicular thereto.
The absorber has at least a monolayer structure portion,
When the absorbent body is divided into three parts in the longitudinal direction, the first absorbent part located in the center, the second absorbent part and the third part extending from the first absorbent part forward and backward in the longitudinal direction, respectively. Divided into absorption parts,
The basis weight of the superabsorbent polymer present in the second absorbent part is higher than the basis weight of the superabsorbent polymer present in the third absorbent part,
A first recess extending in one direction is formed on the surface of the first absorption part,
The end of the first recess extending in one direction does not reach the side edge of the absorber, and the extending direction faces the longitudinal direction of the absorber.
A second recess is formed on the surface of the second absorption portion, which is continuous from at least the first recess and extends in the longitudinal direction of the absorber,
The 1st crevice and the 2nd crevice provide the absorber of an absorptive article currently formed in the surface of the same side in the above-mentioned absorber.

FIG. 1 (a) is a plan view showing an embodiment of the absorbent body of the present invention as seen from the top sheet side, and FIG. 1 (b) is a cross-sectional view taken along the line bb in FIG. 1 (a). . FIG. 2 is a plan view of the unfolded disposable diaper provided with the absorbent body shown in FIG. 1 as viewed from the top sheet side. FIG. 3 is an exploded perspective view of the diaper shown in FIG. 4A to 4I are plan views showing various other aspects of the second recess formed in the second absorbent portion of the absorber. FIG. 5 is a plan view showing another aspect of the first recess formed in the first absorption portion of the absorber. FIG. 6 is a plan view showing another aspect of the third recess formed in the third absorption portion of the absorber. FIG. 7 is a schematic diagram illustrating an example of the manufacturing apparatus for the absorbent body illustrated in FIG. 1. 8A is a schematic cross-sectional view along the width direction of a part (concave portion) on the outer peripheral surface side of the rotating drum shown in FIG. 7, and FIG. 8B is an outer periphery of the rotating drum shown in FIG. It is a schematic cross section along the rotation direction of a part (concave part) on the surface side. FIG. 9 is a schematic cross-sectional view showing a state where an absorbent material is deposited in the concave portion of the rotating drum shown in FIG. Fig.10 (a) is sectional drawing in the thickness direction in alignment with the longitudinal direction of the absorber precursor manufactured using the apparatus shown in FIG. 7, FIG.10 (b) shows in FIG.10 (a). It is sectional drawing in the thickness direction in alignment with the longitudinal direction of the absorber of this invention obtained by compressing an absorber precursor. FIG. 11 is a plan view of the absorber manufactured in the example. FIG. 12 is a plan view of the absorber manufactured in Examples and Comparative Examples.

Detailed Description of the Invention

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. The absorbent body of the present invention has a single layer structure or a multilayer structure, and has at least a single layer structure portion containing pulp and a superabsorbent polymer. One feature is that the superabsorbent polymer is unevenly distributed at a specific site in the longitudinal direction of the absorbent body, and a concave portion extending in the longitudinal direction is provided in the central region in the longitudinal direction of the absorbent body. When the absorber 10 has a single layer structure, the single layer structure itself constitutes the absorber 10. When the absorber 10 has a multilayer structure, at least one layer of the multilayer structure includes the single layer structure portion. When the absorbent body 10 is a single layer, the single layer structure portion itself is used as the absorbent body 10, or the single layer structure portion is used by being coated with a liquid-permeable sheet such as tissue paper or nonwoven fabric. . When the absorber 10 has a multilayer structure, the absorber 10 itself having a multilayer structure is used, or the entirety of the absorber 10 having a multilayer structure is covered with a liquid-permeable sheet. Or each layer of a multilayer structure is coat | covered with a liquid-permeable sheet | seat, respectively, and those are laminated | stacked and used. In the following description, there is a description regarding the basis weight and thickness of the absorbent body 10 and the basis weight of the superabsorbent polymer, and these values are measured in a state where the liquid-permeable sheet is removed from the absorbent body 10. Means something.

FIG. 1A and FIG. 1B show an absorber 10 having a single layer structure as an embodiment of the absorber of the present invention. Therefore, the absorber 10 shown to the same figure corresponds to the single layer structure part said to this invention. The absorber 10 shown in the figure has a vertically long shape having a longitudinal direction Y and a width direction X orthogonal thereto. The absorber 10 has the 1st absorption part 11 in the center area of the longitudinal direction. Further, the absorbent body 10 includes a second absorbent section 12 and a third absorbent section 13 that extend from the first absorbent section 10 forward and backward in the longitudinal direction, respectively. The 1st, 2nd and

3rd absorption parts

11, 12, and 13 only displayed the area | region in the planar view of the absorber 10 by division, and are not isolate | separated between each absorption part. In the present invention, in order to objectively specify the positions of the first, second, and

third absorbers

11, 12, and 13, the absorber 10 is positioned in the center when virtually divided into three in the longitudinal direction. The part is defined as the first absorption part 11. The 1st absorption part 11 shall occupy 1/2 of the length of the longitudinal direction of the absorber 10. FIG. Then, ¼ regions extending from the first absorption portion 10 to the front and rear in the longitudinal direction are defined as the second absorption portion 12 and the third absorption portion 13, respectively. As shown in FIG. 2 to be described later, when the absorbent body 10 is incorporated into an absorbent article, the first absorbent portion 11 is located at the crotch portion of the article, the second absorbent portion 12 is located at the ventral side, and the third The absorber 13 is located on the back side. The second absorber 12 is located on the entire width direction of the absorber 10.

The absorbent body 10 shown in FIG. 1 has a substantially rectangular shape having a long side in the longitudinal direction in plan view. However, the shape of the absorbent body 10 is not limited to this. For example, the left and right side edges of the first absorbent body 11 are directed inward in the width direction for the purpose of fitting the absorbent body 10 to the wearer's buttocks. It may be a curved shape. Moreover, it is good also as a shape where the width | variety of the longitudinal direction edge part area in the 2nd absorption part 12 or the width | variety of the longitudinal direction edge part area in the 3rd absorption part 13 becomes narrow gradually as it goes to a longitudinal direction edge.

に関して Regarding the uneven distribution of the superabsorbent polymer described above, the basis weight of the superabsorbent polymer present in the second absorbent portion 12 is higher than the basis weight of the superabsorbent polymer present in the third absorbent portion 13. That is, regarding the basis weight of the superabsorbent polymer, the second absorbent portion 12 is a high basis weight portion with respect to the third absorbent portion 13. Since the 2nd absorption part 12 is a site | part located in an abdominal side part when the absorber 10 is integrated in an absorbent article, and the 3rd absorption part 13 is a site | part located in a back side part, it is a super absorbent polymer. Is unevenly distributed on the ventral side rather than the dorsal side. By unevenly distributing the superabsorbent polymer in this way, the entire area of the absorbent body 10 can be efficiently used for absorbing liquid. From this viewpoint, when the basis weight of the superabsorbent polymer present in the third absorbent portion 13 is 1, the basis weight of the superabsorbent polymer present in the second absorbent portion 12 is preferably greater than 1. More preferably, it is 1.2 or more, and more preferably 1.5 or more. The upper limit is preferably smaller than 2.5, more preferably 2.3 or less, and even more preferably 2.0 or less. Moreover, in the 2nd absorption part 12 which is a high basic weight part by setting the relationship of the basic weight of the high absorption polymer in the 2nd absorption part 12 and the 3rd absorption part 13 in this way, it is a high absorption polymer. It is also possible to effectively prevent the occurrence of graininess caused by arranging a large amount of.

When the highly absorbent polymer is unevenly distributed, it is preferable that the boundary surface of the uneven distribution changes gently. Since the boundary surface of the uneven distribution of the superabsorbent polymer changes gently, the capillary force at the boundary surface of the uneven distribution does not change rapidly but changes gradually. In the part where the capillary force has changed suddenly, all of the installed liquid cannot react to the change in capillary force, causing liquid retention and increasing free water, delaying absorption time and wetback. May cause an increase in volume. On the other hand, when the capillary force in the planar direction of the absorbent body is gradually changed, the disposed liquid is also gently distributed because the change in the capillary force is gentle. As a result, the effect of shortening the liquid absorption time and the effect of reducing the wetback amount can be maximized.

The above description relates to the basis weight of the superabsorbent polymer between the second absorbent portion 12 and the third absorbent portion 13, and the basis weight of the superabsorbent polymer in the first absorbent portion 11. The following is preferable. The basis weight of the superabsorbent polymer at the site connected to the second absorbent portion 12 in the first absorbent portion 11 is the same as the basis weight of the superabsorbent polymer in the second absorbent portion 12. It is preferable. On the other hand, the basis weight of the superabsorbent polymer at the site connected to the third absorber 13 in the first absorber 11 is the same as the basis weight of the superabsorbent polymer in the third absorber 13. It is preferable. Therefore, in the 1st absorption part 11, as shown in FIG. 1, the site | part 112 which is the same as the basic weight of the high absorption polymer in the 2nd absorption part 12, and the high absorption in the 3rd absorption part 13 are shown. A portion 113 having the same basis weight as the polymer is mixed. As a result, a boundary K between the part 112 and the part 113 exists in the first absorption part 11.

As a preferred embodiment, there is an embodiment in which the basis weight of the superabsorbent polymer in the entire area of the first absorbent portion 11 is the same as the basis weight of the superabsorbent polymer in the second absorbent portion 12. In this case, a portion 112 that is the same as the basis weight of the superabsorbent polymer in the second absorbent portion 12 and a portion that is the same as the basis weight of the superabsorbent polymer in the third absorbent portion 13. A boundary portion K with 113 coincides with a boundary portion between the first absorption portion 11 and the third absorption portion 13.

As yet another preferred embodiment, the basis weight of the superabsorbent polymer in the entire area of the first absorbent portion 11 is the same as the basis weight of the superabsorbent polymer in the second absorbent portion 12, and the third absorbent The aspect with which the basic weight of the superabsorbent polymer in the site | part connected with the 1st absorption part 11 among the part 13 is the same as the basic weight of the superabsorbent polymer in the 1st absorption part 11 is mentioned. It is done. In this case, a portion 112 that is the same as the basis weight of the superabsorbent polymer in the second absorbent portion 12 and a portion that is the same as the basis weight of the superabsorbent polymer in the third absorbent portion 13. A boundary K with 113 exists in the third absorber 13.

When the boundary K exists in (a) the first absorber 11, (b) when it exists at the boundary between the first absorber 11 and the third absorber 13, and (c) in the third absorber 13 In any case, the boundary portion K generally extends linearly in the width direction when the absorber 10 is viewed in plan. In any of the cases (a) to (c), the boundary portion K is located closer to the third absorption portion 13 when the absorber 10 is virtually divided into two in the longitudinal direction. Preferably it is. In other words, when the absorbent body 10 is viewed along the longitudinal direction, it is preferable that the high basis weight part of the superabsorbent polymer occupies more than half of the length of the absorbent body 10. By adopting such a configuration, it is possible to place the superabsorbent polymer mainly on the site where a large amount of liquid is excreted, improving the liquid absorption efficiency and preventing the liquid leakage more effectively. Is done. From the viewpoint of making this effect even more prominent, the boundary portion K is located within a region from the edge on the third absorption portion 13 side to 1/3 when the absorber 10 is virtually divided into three equal parts. It is preferable.

When the boundary part K measured the basis weight of the superabsorbent polymer in the absorbent body 10 sequentially from the third absorption part 13 side toward the first absorption part 11, the basis weight changed first. Position. It determines similarly about the boundary part of the pulp mentioned later, and the boundary part of an apparent density.

The above explanation is about the relative relationship of the basis weight of the superabsorbent polymer between the absorbent parts in the absorbent body 10, and the value of the basis weight itself is preferably as described below. . Regarding the second absorbent portion 12, the lower limit value of the basis weight of the superabsorbent polymer is preferably 175 g / m ² , more preferably 200 g / m ² , and even more preferably 225 g / m ^2. More preferably, it is 235 g / m ² . The upper limit is preferably 400 g / m ² , more preferably 350 g / m ² , still more preferably 300 g / m ² , and even more preferably 260 g / m ² . Regarding the third absorbent portion 13, the lower limit value of the basis weight of the superabsorbent polymer is preferably 50 g / m ² , more preferably 75 g / m ² , and even more preferably 100 g / m ^2. 115 g / m ² is even more preferable. The upper limit is preferably 250 g / m ² , more preferably 200 g / m ² , still more preferably 150 g / m ² , and even more preferably 130 g / m ² .

The above explanation is about the basis weight of the superabsorbent polymer in the absorbent body 10, and in the absorbent body 10, pulp is also unevenly distributed. Specifically, the basis weight of the pulp present in the second absorbent portion 12 is higher than the basis weight of the pulp present in the third absorbent portion 13. That is, regarding the basis weight of the pulp, the second absorbent portion 12 is a high basis weight portion with respect to the third absorbent portion 13. By making the pulp unevenly distributed in addition to the superabsorbent polymer, the entire area of the absorbent body 10 can be used even more efficiently for absorbing the liquid. From this viewpoint, when the basis weight of the pulp present in the third absorbent portion 13 is 1, the basis weight of the pulp present in the second absorbent portion 12 is preferably greater than 1, and is 1.2 or more. Is more preferably 1.5 or more, and further preferably 2.00 or more. From the viewpoint of reducing discomfort during wearing, the upper limit is preferably smaller than 3.0, more preferably 2.5 or less, still more preferably 2.05 or less, and 2.0 or less. Is more preferable.

The above explanation relates to the basis weight of the pulp between the second absorbent portion 12 and the third absorbent portion 13, and the basis weight of the pulp in the first absorbent portion 11 is preferably as follows. . It is preferable that the basis weight of the pulp in the site | part connected with the 2nd absorption part 12 among the 1st absorption parts 11 is the same as the basis weight of the pulp in the 2nd absorption part 12. FIG. On the other hand, it is preferable that the basis weight of the pulp in the site | part connected with the 3rd absorption part 13 among the 1st absorption parts 11 is the same as the basis weight of the pulp in the 3rd absorption part 13. FIG. Therefore, in the 1st absorption part 11, the site | part which is the same as the basic weight of the pulp in the 2nd absorption part 12, and the site | part which is the same as the basic weight of the pulp in the 3rd absorption part 13 It is mixed. As a result, there is a boundary between both parts in the first absorption part 11. In general, the position of the boundary portion substantially coincides with the position of the boundary portion K with respect to the superabsorbent polymer described above.

As another aspect, there is an aspect in which the basis weight of the pulp in the entire area of the first absorbent portion 11 is the same as the basis weight of the pulp in the second absorbent portion 12. In this case, a boundary portion between a portion that is the same as the basis weight of the pulp in the second absorbent portion 12 and a portion that is the same as the basis weight of the superabsorbent polymer in the third absorbent portion 13. Corresponds to the boundary between the first absorption part 11 and the third absorption part 13.

As yet another aspect, the basis weight of the pulp in the entire area of the first absorbent portion 11 is the same as the basis weight of the superabsorbent polymer in the second absorbent portion 12, and the third absorbent portion 13 The aspect with which the basic weight of the pulp in the site | part connected with the 1st absorption part 11 is the same as the basic weight of the superabsorbent polymer in the 1st absorption part 11 is mentioned. In this case, the boundary portion between the portion that is the same as the basis weight of the pulp in the second absorbent portion 12 and the portion that is the same as the basis weight of the pulp in the third absorbent portion 13 is 3 exists in the absorber 13.

とおり Since the basis weight of the superabsorbent polymer and pulp is unevenly distributed in the absorbent body 10 as described above, the basis weight of the absorbent body 10 itself is also unevenly distributed. Specifically, the basis weight of the second absorbent portion 12 is higher than the basis weight of the third absorbent portion 13. That is, regarding the basis weight of the absorbent body, the second absorbent portion 12 is a high basis weight portion with respect to the third absorbent portion 13. The boundary part between the high basis weight part and the low basis weight part in the absorbent body 10 exists in the first absorption part 11, exists in the boundary between the first absorption part 11 and the third absorption part 13, or It is preferable to exist in the third absorption portion 13.

Regarding the value of the basis weight itself at each absorption part in the absorbent body 10, it is preferable to be as described below. For the second absorber 12, it is preferable that the lower limit of the basis weight of the pulp is 150 g / ^{m 2,} more preferably from 175 g / ^{m 2,} and still more preferably from 200 g / ^{m 2.} The upper limit is preferably 300 g / m ² , more preferably 275 g / m, and even more preferably 250 g / m ² . For the third absorbent portion 13, the lower limit of the basis weight of the pulp is preferably from 50 g / ^{m 2,} more preferably from 75 g / ^{m 2,} and still more preferably from 100 g / ^{m 2.} Upper limit thereof is preferably 200 g / ^{m 2,} more preferably from 175 g / ^{m 2,} and still more preferably from 150 g / ^{m 2.}

The basis weight ratio (superabsorbent polymer basis weight / pulp basis weight) between the superabsorbent polymer and the pulp in the second absorbent portion 12 is the same as the basis weight ratio between the superabsorbent polymer and the pulp in the third absorbent portion 13. It may be different or different. In the former case, the lower limit of the basis weight ratio with the superabsorbent polymer is preferably 0.6, more preferably 0.8, even more preferably 1.0, and 1.10. Is more preferable. The upper limit is preferably 3.0, more preferably 2.5, even more preferably 2.0, and even more preferably 1.15. In the latter case, the basis weight ratio in the second absorbent portion 12 is preferably larger than the basis weight ratio in the third absorbent portion 13. In this case, the lower limit of the basis weight ratio in the second absorbent portion 12 is preferably 0.6, more preferably 0.8, even more preferably 1.0, and 1.14. More preferably it is. The upper limit is preferably 3.5, more preferably 3.0, still more preferably 2.5, and even more preferably 1.15. Moreover, it is preferable that the lower limit of the basic weight ratio in the 3rd absorption part 13 is 0.5, it is still more preferable that it is 0.7, It is still more preferable that it is 0.9, It is 1.12 It is even more preferable. The upper limit is preferably 3.0, more preferably 2.5, even more preferably 2.0, and even more preferably 1.14.
The basis weight in each absorption part can be measured by the following method.

[Measurement method of basis weight]
Of the absorbent body 10, a 50 mm × 50 mm absorbent body piece is cut from each of the first absorbent section, the second absorbent section, and the third absorbent section, and the mass (a) of the absorbent body piece is measured. In addition, this measurement is performed about 10 absorber pieces, and let the average value be each mass. The 10 absorbent pieces may be cut from the same absorbent body 10 if the absorbent body 10 is sufficiently large, or cut separately from 10 absorbent bodies 10 if the absorbent body 10 is small. You may do it.
Next, each of the 10 absorbent pieces is sealed in a mesh bag and immersed in an aqueous solution of ascorbic acid and riboflavin overnight. Then, each absorbent piece is exposed to sunlight with the soaked mesh bag. Thereafter, the mesh bag is washed with water, and the mass of the bag contents is measured (b). Thereafter, the mesh bag is washed with water, and the mass of the bag contents is measured (b). Here, since a is the total mass of the pulp and the superabsorbent polymer and b is the mass of the pulp, the mass of the superabsorbent polymer can be calculated by ab. And the pulp basic weight and superabsorbent polymer basic weight of the 1st absorption part of the absorber 10, a 2nd absorption part, and a 3rd absorption part are computable with the following formula | equation.
Pulp basis weight: (pulp mass (b)) / (area of absorber piece 2500 mm ² )
Superabsorbent polymer basis weight: (Superabsorbent polymer mass (ab)) / (Absorber piece area 2500 mm2)

In relation to the superabsorbent polymer in the cocoon absorbent body 10 and the basis weight of the pulp, it is preferable that the thickness of the absorbent body 10 is the same at any position of the absorbent body (a). Alternatively, (b) the thickness of the second absorbent portion 12 may be larger than the thickness of the third absorbent portion 13. In the case of (b), the first absorption part 11 may be the same as the thickness of the (b-1) second absorption part 12 or the same as the thickness of the third absorption part 13. Or (b-2) In the 1st absorption part 11, the site | part same as the thickness of the 2nd absorption part 12 and the site | part same as the thickness of the 3rd absorption part 13 may coexist. In the case of (b-2), the boundary portion between the same portion as the thickness of the second absorbent portion 12 and the same portion as the thickness of the third absorbent portion 13 is generally the boundary portion K related to the superabsorbent polymer described above. It is almost coincident with the position of.

In the case of (a), the lower limit of the thickness of the absorber 10 is preferably 2 mm, and more preferably 4 mm. The upper limit is preferably 15 mm, more preferably 10 mm, and even more preferably 7 mm. In the case of (b), the lower limit of the thickness of the second absorbent portion 12 is preferably 3 mm, and more preferably 5 mm. The upper limit is preferably 15 mm, more preferably 10 mm, and even more preferably 8 mm. On the other hand, the lower limit of the thickness of the third absorbent portion 13 is preferably 2 mm, and more preferably 4 mm. The upper limit is preferably 12 mm, more preferably 9 mm, and even more preferably 6 mm. The thickness referred to here is a value measured at a portion where a concave portion described later is not provided. The thickness of the absorber 10 is a non-contact type laser displacement meter (Laser head LK-G30, manufactured by KEYENCE) with a 5 cm × 5 cm plate (2.5 g / cm ² load) placed on the absorber 10. It is measured using a displacement meter LK-GD500).

Furthermore, in relation to the superabsorbent polymer in the absorbent body 10 and the basis weight of the pulp, it is preferable that the apparent density of the absorbent body 10 is the same at any position of the absorbent body 10 (a). Alternatively, (b) the apparent density of the second absorbent portion 12 may be larger than the apparent density of the third absorbent portion 13. In the case of (b), the first absorbent portion 11 may be the same as the apparent density of (b-1) the second absorbent portion 12 or the same as the apparent density of the third absorbent portion 13. Or (b-2) In the 1st absorption part 11, the site | part same as the apparent density of the 2nd absorption part 12 and the site | part same as the apparent density of the 3rd absorption part 13 may coexist. In the case of (b-2), the boundary portion between the same portion as the apparent density of the second absorbent portion 12 and the same portion as the apparent density of the third absorbent portion 13 is generally the boundary relating to the superabsorbent polymer described above. The position substantially coincides with the position of the portion K.

In the case of (a), the apparent density of the absorbent body 10 preferably has a lower limit value is 0.03 g / cm ^3, further preferably 0.05 g / cm ^3. Upper limit is preferably 0.30 g / cm ^3, more preferably from 0.20 g / cm ^3, and still more preferably 0.10 g / cm ^3. In the case of (b), the lower limit of the apparent density of the second absorbent portion 12 is preferably 0.02 g / cm ³ , and more preferably 0.04 g / cm ³ . The upper limit is preferably 0.35 g / cm ³ , more preferably 0.25 g / cm ³ , and even more preferably 0.15 g / cm ³ . On the other hand, the apparent density of the third absorber 13 is preferably 0.01 g / cm ³ , and more preferably 0.03 g / cm ³ . The upper limit is preferably 0.20 g / cm ³ , more preferably 0.12 g / cm ³ , and even more preferably 0.15 g / cm ³ . The apparent density of the absorbent body 10 is calculated by dividing the total mass of the pulp amount and the superabsorbent polymer amount in each part of the absorbent body by the volume of each part of the absorbent body.

As described above, the absorbent body of the present invention is characterized by having a concave portion extending in the longitudinal direction in the central region in the longitudinal direction in addition to uneven distribution of the superabsorbent polymer. In detail, as shown in FIG. 1, the 1st recessed part 21 extended in one direction toward a longitudinal direction is formed in the surface of the 1st absorption part 11 which is this center area. The absorber 10 has the 1st surface 10a and the 2nd surface 10b located in the opposite side as shown in FIG.1 (b), but the 1st recessed part 21 is provided in the 2nd surface 10b. . Therefore, the 2nd surface 10b of the 1st absorption part 11 is an uneven surface. On the other hand, the 1st surface 10a of the 1st absorption part 11 is a flat surface.

The first recess 21 is provided in two straight lines and in parallel. However, the first recess 21 may be provided with only one line, or may be provided with three or more lines. Each first recess 21 is provided symmetrically with respect to the longitudinal center line CL of the absorber 11. The 1st recessed part 21 is formed because the 2nd surface 10b is dented toward the 1st surface 10a, and has a bottom. Instead of having the bottom with the 1st crevice 21 or in addition to that, the 1st crevice 21 may be constituted from the penetration hole penetrated over the thickness direction of absorber 10. The width of the first recess 21 is substantially the same over the entire region in the longitudinal direction. The first recesses 21 have the same length, and their front and rear end portions may terminate in the first absorption portion 11. Or it may exist in the 2nd absorption part 12 beyond the boundary of the 1st absorption part 11 and the 2nd absorption part 12, and may form the 2nd crevice 22 (especially direct 2nd crevice 221). The third recessed portion 23 (particularly, the orthogonal third recessed portion 231) may be formed in the third absorbing portion 13 beyond the boundary between the portion 11 and the third absorbing portion 13. In any case, the end of the first recess 21 does not reach the side edge of the absorbent body 10. Thereby, in the 1st absorption part 11, the outflow of the liquid from a side edge is prevented effectively.

By providing the first recess 21, the excreted liquid can be quickly discharged toward the second absorbent portion 12, which is a portion where the superabsorbent polymer is unevenly distributed, due to the synergistic effect with the uneven distribution of the superabsorbent polymer described above. It is possible to guide, thereby increasing the diffusion rate of the excreted liquid and absorbing the liquid quickly. Moreover, by providing the 1st recessed part 21, the absorber 10 becomes easy to deform | transform and the fit property to a wearer's body improves. From the viewpoint of further increasing the diffusion and absorption speed of the liquid, it is advantageous that the first recess 21 extends only in the longitudinal direction of the absorbent body 10. In this specification, “extending in the longitudinal direction” means not only when the first recess 21 extends linearly, but also when it extends while meandering or when it draws a gentle curve, etc. It is a concept that also includes Further, the extending direction of the first recess 21 is not only completely coincident with the longitudinal direction of the absorbent body 10 but is also inclined within a range of plus or minus 20 degrees with respect to the longitudinal direction of the absorbent body 10. Is also included.

から From the viewpoint of further enhancing the effects described above, the width of each first recess 21 is preferably 2 mm or more, more preferably 3 mm or more, and even more preferably 5 mm or more. Regarding the upper limit, it is preferably 20 mm or less, more preferably 15 mm or less, and even more preferably 10 mm or less. Further, the widths may be the same or substantially the same, or may change in the middle. This width is particularly preferable when the absorbent body 10 is used in a baby disposable diaper.

In the first absorption part 11, the part where the first concave part 21 is formed is the part where the first concave part 21 is not formed (hereinafter, this part is referred to as the first convex part in comparison with the first concave part 21. ). “Integrally molded” means that these parts are integrated without being separated from each other without using a bonding means such as an adhesive or heat fusion, and are integrally formed from the same material. Means that If these parts are integrally formed, the liquid has continuity that can move smoothly. It is preferable that the 1st recessed part 21 is low basic weight with respect to a 1st convex part. As shown in FIG. 1, since the 1st recessed part 21 is a site | part whose thickness is thinner than a 1st convex part, the 1st recessed part 21 is lower basic weight and thickness than a 1st convex part. Furthermore, regarding the apparent density, it is preferable that the first concave portion 21 has a lower density than the first convex portion. Since the 1st absorption part 11 becomes such composition, absorber 10 becomes easier to follow the shape of a wearer's body.

A first through-hole 21 ′ as another form of the first recess 21 described above is also formed in the first absorption part 11. The first through hole 21 ′ penetrates the first absorption part 11 in the thickness direction. The first through hole 21 ′ is a concave portion in a state where the thickness of the bottom portion of the first concave portion 21 is reduced and finally becomes zero. Accordingly, the first through hole 21 ′ is also an embodiment of the first recess 21.

The first through hole 21 ′ is provided with two strips symmetrically with respect to the longitudinal center line CL. However, the first through hole 21 ′ may be provided with only one line, or may be provided with three or more lines. The first through hole 21 ′ is formed on the outer side in the width direction with respect to the first recess 21 described above. The first through hole 21 ′ has a flat and substantially trapezoidal shape that extends linearly in the longitudinal direction of the absorber 10 and has an inner side 21 a ′ and an outer side 21 b ′ that are parallel to each other. However, the shape of the first through hole 21 ′ is not limited to a flat and substantially trapezoidal shape, and may be a rectangle or an oval extending in the longitudinal direction. The inner side 21a 'is shorter than the outer side 21b'. Further, the inner side 21a 'and the outer side 21b' are shorter than the first recess 21 described above. The front and rear end portions of the first through hole 21 ′ may terminate in the first absorption portion 11. Or it may exist in the 2nd absorption part 12 exceeding the boundary of the 1st absorption part 11 and the 2nd absorption part 12, and the 3rd beyond the boundary of the 1st absorption part 11 and the 3rd absorption part 13 may exist. It may exist in the absorption part 13. In any case, the end of the first through hole 21 ′ does not reach the side edge of the absorber 10.

時間が By forming the first through hole 21 ′ in addition to the first recess 21, the time for the excreted liquid to be absorbed by the absorber 10 is further shortened. From the viewpoint of making this effect even more remarkable, the width of each first through hole 21 ′ is preferably 2 mm or more, more preferably 3 mm or more, and even more preferably 5 mm or more. . Regarding the upper limit, it is preferably 20 mm or less, more preferably 15 mm or less, and even more preferably 10 mm or less. Further, the widths may be the same or substantially the same, or may change in the middle. This width is particularly preferable when the absorbent body 10 is used in a baby disposable diaper.

In the present embodiment, in particular, it is preferable that the first recess 21 is formed of a through hole and that the first through hole 21 ′ is formed in addition to the first recess 21.

In the soot absorber 10, a concave portion is formed on the surface of the second absorbent portion 12 in addition to the first absorbent portion 11. This recess is referred to as a second recess 22. The second recess 22 has an orthogonal second recess 221 that is continuous from the first absorption portion 11 and extends linearly in the longitudinal direction of the single-layer structure portion. In addition to the orthogonal second recess 221, oblique

second recesses

222 and 223, which are other recesses, are formed on the surface of the second absorption portion 12. Each skew 2nd recessed part 222,223 is a skewed recessed part inclined with respect to the longitudinal direction centerline CL of the absorber 10, and has the shape extended toward mutually different 1st direction and 2nd direction. is doing. Here, the inclination does not include one having an angle of 90 ° with respect to the longitudinal direction. Each of the oblique second

concave portions

222 and 223 and the first concave portion 21 and the direct second concave portion 221 described above are formed on the same surface of the absorbent body 10. That is, it is formed so that the opening faces the second surface 10b side. Therefore, the 2nd surface 10b of the 2nd absorption part 12 is uneven. In contrast, the first surface 10a is a flat surface. Each of the oblique

second recesses

222 and 223 is formed in an oblique lattice shape by being inclined toward the first direction and the second direction that are symmetrically inclined with respect to the longitudinal center line CL. . By forming the 2nd recessed part 22 in such a shape, the fitting property of the absorber 10, especially the fitting property in the 2nd absorption part 12 improves further.

The 2nd recessed part 22 is formed when the 2nd surface 10b is dented toward the 1st surface 10a, and has a bottom. Instead of having the bottom with the 2nd crevice 22 or in addition to that, the 2nd crevice 22 may be constituted from the penetration hole penetrated over the thickness direction of absorber 10. The width of the second recess 22 is substantially the same over the entire area in the longitudinal direction. The width of the second recess 22 can be the same as the width of the first recess 21 described above.

The skewed

second recesses

222 and 223 have a position 22a of a part of their ends matching the end of the first recess 21 or the straight second recess 221 described above. As a result, a part of the skew second recesses 222 and 223 is connected to the first recess 21 or the orthogonal second recess 221. As a result, the liquid excreted in the first absorbent portion 11 is guided to the first concave portion 21 and the second concave portion 22 connected thereto, to the second absorbent portion 12 that is a high basis weight portion of the superabsorbent polymer. Guided smoothly. Further, the end of the second recess 22 does not reach the side edge of the absorber 10. Thereby, also in the 2nd absorption part 12, the outflow of the liquid from a side edge is prevented effectively.

In the second absorption portion 12, the portion where the second recess 22 is formed is the portion where the second recess 22 is not formed (hereinafter, this portion is referred to as the second protrusion in comparison with the second recess 22. ). The meaning of “integrated molding” is as described above. The advantages of integral molding are as described above. It is preferable that the 2nd recessed part 22 is low basic weight with respect to a 2nd convex part. Since the 2nd recessed part 22 is a site | part whose thickness is thinner than a 2nd convex part, the 2nd recessed part 22 is a lower basic weight and thickness than a 2nd convex part. Furthermore, regarding the apparent density, it is preferable that the second concave portion 22 has a lower density than the second convex portion. The 2nd absorption part 12 becomes much easier to follow the shape of a wearer's body because the 2nd absorption part 12 becomes such composition.

The degree to which the oblique

second recesses

222 and 223 are inclined with respect to the longitudinal direction of the absorber 10 is more than 0 degree and less than 90 degrees with respect to the longitudinal direction. However, this does not prevent the second absorbent portion 12 from being formed with a recess extending in the longitudinal direction or a recess extending in a direction orthogonal to the longitudinal direction. From the standpoint of further improving the fit of the second absorbent portion 12, the ratio of the sum of the lengths of the skewed

second recesses

222 and 223 to the sum of the lengths of the second recesses 22 is 70% or more. Preferably, it is 75% or more, more preferably 80% or more. The upper limit is preferably 95%, and more preferably 90%.

In the soot absorber 10, in addition to the 1st absorption part 11 and the 2nd absorption part 12, the recessed part is formed also in the surface of the 3rd absorption part 13. FIG. This recess is referred to as a third recess 23. The 3rd recessed part 23 has the orthogonal 3rd recessed part 231 which continues from the 1st absorption part 11, and extends linearly in the longitudinal direction of a single layer structure site | part. In addition to the direct third recess 231, another recess 232 is formed on the surface of the third absorption portion 13. The recess 232 has a shape extending in one direction, and intersects the longitudinal center line CL of the absorbent body 10 at an angle of more than 0 degree and not more than 90 degrees. Note that the recess 232 that intersects the longitudinal center line CL of the absorbent body 10 at an angle greater than 0 degrees and less than 90 degrees is also referred to as a skew third recess. The concave portion 232, the first concave portion 21, the direct second concave portion 221, the oblique second

concave portions

222 and 223, and the direct third concave portion 231 described above are formed on the same side surface of the absorbent body 10. That is, it is formed so that the opening faces the second surface 10b side. Therefore, the 2nd surface 10b of the 3rd absorption part 13 is uneven. In contrast, the first surface 10a is a flat surface.

In the present embodiment, the recesses 232 intersect with the longitudinal direction of the absorbent body 10 at an angle of 90 degrees. That is, the recess 232 extends in a direction orthogonal to the longitudinal direction of the absorbent body 10. However, this does not prevent the third absorbent portion 13 from being formed with a recess extending in the longitudinal direction. Since the recessed portion 232 extends in a direction orthogonal to the longitudinal direction of the absorbent body 10, when the excreted liquid flows into the third absorbent portion 13, the recessed portion 232 causes a further flow of the liquid. Plays the role of damming. Therefore, liquid leakage from the end of the back side portion is effectively prevented. From the viewpoint of making this effect even more prominent, the angle between the longitudinal direction of the absorbent article 10 and the longitudinal direction of the absorbent article 10 out of the third recesses 23 with respect to the total length of all the third recesses 23. The ratio of the sum of the lengths of the recesses 232 intersecting with each other is preferably 60% or more, more preferably 70% or more, and still more preferably 80% or more. The upper limit is preferably 95%, and more preferably 90%.

Furthermore, the end of the recess 232 does not reach the side edge of the absorbent body 10. Thereby, also in the 3rd absorption part 13, the outflow of the liquid from a side edge is prevented effectively.

The third recess portion 23 is formed by denting the second surface 10b of the third absorption portion 13 toward the first surface 10a and has a bottom. Instead of the third recessed portion 23 having a bottom, or in addition thereto, the third recessed portion 23 may be configured from a through-hole penetrating through the absorbent body 10 in the thickness direction.

In this embodiment, the two recessed parts 232 are formed in parallel with the width direction of the absorber 10. The width of the recess 232 is substantially the same over its entire length. The width of the third recess 23 can be the same as the width of the first recess 21 described above. In the third absorption portion 13, the portion where the third recess 23 is formed is the portion where the third recess 23 is not formed (hereinafter, this portion is referred to as the third protrusion in comparison with the third recess 23. ). The meaning of “integrated molding” is as described above. The advantages of integral molding are as described above. It is preferable that the 3rd recessed part 23 is low basic weight with respect to a 3rd convex part. Since the 3rd recessed part 23 is a site | part whose thickness is thinner than a 2nd convex part, the 3rd recessed part 23 is a low basic weight and a low thickness rather than a 3rd convex part. Further, regarding the apparent density, it is preferable that the third concave portion 23 has a lower density than the third convex portion. Since the 3rd absorption part 13 becomes such composition, it becomes easier to block a flow of a liquid.

In the present embodiment, the absorbent body 10 has a pulp layer on the surface of which the basis weight of the superabsorbent polymer is smaller than that of other parts in the thickness direction (hereinafter, this pulp layer is also referred to as “filter layer”). ) Is preferable. In particular, the filter layer preferably faces the side facing the back sheet in a state where the absorbent body 10 is incorporated in the absorbent article. Thereby, the liquid absorbed by the absorber 10 smoothly moves to the filter layer by the capillary force of the pulp. In the filter layer, liquid transfer tends to occur in the filter layer due to the low basis weight of the superabsorbent polymer contained in the filter layer. As a result, when the distribution of the liquid is observed in the cross section along the thickness direction of the absorbent body 10, it becomes a mountain-shaped distribution having a convex shape from the skin facing surface side to the non-skin facing surface side. By such a liquid distribution, an effect of shortening the absorption time of the liquid and an effect of reducing the wetback amount are exhibited.

In the absorber 10, it is preferable that the filter layer and the opening side of the first recess and the second recess described above are located on the same side of the absorber 10. In particular, the filter layer faces the side facing the back sheet in a state where the absorbent body 10 is incorporated in the absorbent article, and the side where the first recess and the second recess are open also faces the back sheet. It is preferable to face. Accordingly, there is an advantageous effect that the liquid disposed by using the spaces of the first concave portion and the second concave portion can easily reach the filter layer more efficiently. As a result, the effect of shortening the liquid absorption time and the effect of reducing the amount of wetback are further exhibited.

In the absorbent body 10, it is preferable that the filter layer overlaps only with portions other than the first concave portion and the second concave portion in the thickness direction of the absorbent body 10. This makes it difficult for the first recess and the second recess to hold free water. At the same time, it becomes easier to transmit the liquid to the filter layer existing in a portion other than the first recess and the second recess. As a result, the effect of shortening the absorption time of the liquid and the effect of reducing the wetback amount are further manifested.

The filter layer can be formed using, for example, an apparatus shown in FIG. Specifically, before the mixture of pulp and superabsorbent polymer is deposited on the drum recess 51 of the rotary drum 50 shown in the figure, only the pulp is previously deposited on the drum recess 51. Can do. By forming a filter layer in the drum recess 51 in advance, not only the effect of shortening the absorption time and the effect of reducing the wetback amount, but also the effect of preventing clogging of the drum recess 51, The effect of always stabilizing the pressure of air suction during deposition is also exhibited.

The basis weight of the filter layer can be measured, for example, as follows. First, a sufficient amount of pure water is added to the absorbent body 10. Subsequently, the filter layer is separated by pinching and peeling the filter layer and other portions using tweezers. The separated filter layer is sufficiently dried with a dryer at 105 ° C. Basis weight is calculated by dividing the mass of the filter layer after drying by the area of the filter layer. The basis weight of the filter layer thus measured is preferably 3 g / m ² or more and 50 g / m ² or less. The filter layer may contain a superabsorbent polymer as long as it is in a small amount. In that case, the proportion of the superabsorbent polymer is preferably 50% by mass or less.

2 and 3 show an unfoldable disposable diaper 100 which is an absorbent article including the absorbent body 10 having the above structure. In the following description, the “non-skin contact surface side” refers to the side (surface) that is disposed on the opposite side of the skin side of the wearer when worn among the front and back sides (surfaces) of each member such as the absorbent body 10. It is. The “skin contact surface side” is the side (surface) that is disposed on the skin side of the wearer when wearing, out of the front and back sides (surfaces) of each member. Moreover, regarding the longitudinal direction of the diaper 100, the abdominal side A side is also referred to as “front side”, and the back side A side is also referred to as “rear side”.

The diaper 100 includes a top sheet 121 disposed on the skin contact surface side of the wearer, a back sheet 123 disposed on the non-skin contact surface side, and the absorbent body 10 disposed between the both

sheets

121 and 123. And. The top sheet 121 is made of a liquid-permeable sheet and faces the wearer's skin when the diaper 100 is worn. The back sheet is made of a liquid-impermeable or water-repellent sheet and faces outward when worn.

The heel diaper 100 is formed symmetrically with respect to the longitudinal center line CL extending in the longitudinal direction. The diaper 100 includes a crotch portion C located in a central region in the longitudinal direction, and a ventral side portion A and a back side portion B extending from the crotch portion C forward and backward in the longitudinal direction. The ventral side A is arranged on the wearer's ventral side when the diaper 100 is worn. The back part B is arranged on the back side of the wearer when the diaper 100 is worn. The crotch portion C is arranged on the wearer's crotch when the diaper 100 is worn.

In the diaper 100, the left and right side edges of the abdominal side A and the left and right side edges of the back side part B extend outward in the width direction from the left and right side edges of the crotch C. The left and right side edges of the crotch C are curved in an arc shape inward in the width direction, and have a shape in which the central region in the longitudinal direction is constricted inward as a whole. The top sheet 121 and the back sheet 123 respectively extend outward from the left and right side edges and the front and rear end edges of the absorbent body 10. Each of the top sheet 121 and the back sheet 123 is joined to each other directly or through another member at an extending portion extending outward from the periphery of the absorbent body 10, and sandwiches and fixes the absorbent body 10. is doing.

The diaper 100 is provided with a pair of fastening tapes F, F on the left and right side edges of the back side B. On the outer surface (non-skin contact surface) of the abdominal side A, that is, on the non-skin contact surface of the back sheet 123, a landing tape L for fastening the fastening tapes F and F is provided as shown in FIG. .

A three-dimensional gather forming sheet 162 is disposed on each side of the diaper 100 along the longitudinal direction. The three-dimensional gather forming sheet 162 is used to form a three-dimensional gather. The three-dimensional gather forming sheet 162 is joined to a sheet located on the skin contact surface side, for example, the top sheet 121 such that a fixed end and a free end extending in the longitudinal direction of the diaper 100 are formed in the three-dimensional gather. Furthermore, the three-dimensional gather forming sheet 162 has the front-rear end region and the sheet (for example, the front sheet 121) located on the skin contact surface side joined in the front-rear end region in the longitudinal direction.

A solid gather elastic member 161 extending in the longitudinal direction of the diaper 10 is fixed to the free end of the three-dimensional gather in a stretched state. By the contraction force of the three-dimensional gather elastic member 161, the three-dimensional gather forming sheet 162 stands up toward the wearer's body to form a three-dimensional gather.

The solid gather forming sheet 162 and the back sheet 123 are joined to each other at a position outward in the width direction from the fixed end of the solid gathers, thereby forming a pair of side flaps 124. The side flaps 124 extend outward in the width direction from both side edges along the longitudinal direction of the absorbent body 10, and extend in the longitudinal direction of the diaper 100. In the side flap 124, a plurality of side flap elastic members 163 for forming leg gathers are arranged in an extended state in the longitudinal direction at a portion substantially corresponding to the crotch portion C. The side flap elastic member 163 is sandwiched and fixed between the three-dimensional gather forming sheet 162 and the back sheet 123. Leg gathers are formed in the crotch part C of the diaper 100 by the side flap elastic member 163 contracting.

An elastic sheet 164 for forming waist gathers is disposed at the position of the longitudinal direction end of the heel diaper 100 on the back side B side. The elastic sheet 164 is configured by sandwiching and fixing a plurality of

elastic members

165a and 165b extending in the width direction of the diaper 10 between two

sheet members

164a and 164b.

In the heel elastic sheet 164, among the plurality of

elastic members

165a and 165b, the waist elastic member 165b is disposed so as to extend in the width direction at the longitudinal end region of the back side portion B of the diaper 100. Specifically, the waist elastic member 165b is located between the longitudinal edge on the back side B side and the longitudinal edge on the back side B side of the absorbent body 10 at a position near the waist opening edge W. Yes. Furthermore, the waist elastic member 165b is continuously arranged from a position near one side edge in the width direction of the diaper 100 to a position near the other side edge. On the other hand, the waistline elastic member 165a, which is an elastic member adjacent to the waist elastic member 165b and closer to the crotch C than the waist elastic member 165b, is disposed only on the left and right side portions in the width direction of the diaper 100. In the central region in the width direction, no elastic member is placed. Specifically, the waistline elastic member 165a has one end near the side edge in the width direction of the diaper 100. The other end is terminated before reaching the central region in the width direction of the diaper 100. Therefore, no elastic member is present in the central region in the width direction.

The heel absorber 10 is located from the ventral side A to the back side of the diaper 100. The 1st absorption part 11 in the absorber 10 is located in the crotch part C in the diaper 100. FIG. Moreover, the 2nd absorption part 12 and the 3rd absorption part 13 in the absorber 10 are located in the ventral | abdominal side part A and the back | dorsal part B in the diaper 100, respectively. The 2nd surface 10b which is a surface in which each recessed part in the absorber 10 is formed faces the back surface sheet 123 side, and the 1st surface 10a which is a flat surface faces the surface sheet 121 side.

In the diaper 100 having the above configuration, the liquid excreted in the crotch part C is guided to the first recess 21 formed in the first absorption part 11 of the absorbent body 10 and quickly diffuses in the longitudinal direction. The liquid diffused in the direction is quickly absorbed by the highly absorbent polymer disposed in the second absorbent portion 12 with a high basis weight. Moreover, since the absorbent body 10 is easily deformed flexibly because the absorbent body 11 is formed with each recess having a low basis weight and a small thickness, the absorbent body 10 fits securely to the wearer's body. To do. With these actions, the diaper 100 is effectively prevented from leaking liquid.

In the embodiment shown in FIGS. 2 and 3, the absorber 10 has a single layer structure. Instead of this, it is also possible to employ a multilayer structure absorber and use the absorber shown in FIG. 1 as one of the layers of the multilayer structure. However, when the absorbent body 10 shown in FIG. 1 is used as a single layer structure, there is an advantage that an absorbent body in which a superabsorbent polymer is unevenly distributed can be used without going through a complicated manufacturing process of a multilayer structure by lamination. Further, since lamination is not necessary, there is an advantage that phase shift of each layer does not occur during lamination. In addition, the use of an absorber having a single layer structure is also economically advantageous as compared with the case of using an absorber having a multilayer structure.

FIG. 4 (a) to (i) show another embodiment of the absorbent body 10 of the present invention. The embodiment shown in these drawings is another example of the second recess 22. The second recesses 22 in FIG. 4 (a) are respectively connected to two orthogonal second recesses 221 extending in the longitudinal direction, and two skewed second skews inclined with respect to the longitudinal direction of the absorber. Consists of

recesses

222a and 222b. The lengths of the oblique

second recesses

222a and 222b are substantially the same, and intersect each other at the position of their midpoint. The oblique

second recesses

222a and 222b intersect at an intersection angle θ. The second recess 22 in FIG. 4B is basically the same as the second recess 22 in FIG. 4A, but the crossing angle θ between the two skewed

second recesses

222a and 222b is as shown in FIG. It is larger than the embodiment shown in a). Further, the oblique

second recesses

222a and 222b intersect at a position closer to the orthogonal second recess 221 than the midpoint position thereof. According to these embodiments, the absorbent body 10 not only accurately fits the wearer's abdomen, but also efficiently and quickly moves toward the highly absorbent polymer disposed in the second absorbent portion 12 with a high basis weight. The effect that can be transmitted.

In the embodiment shown in FIG. 4C, the second recess 22 is composed of a plurality of vertical second recesses 222a extending in the longitudinal direction and a plurality of horizontal second recesses 222b extending in the width direction. The vertical second concave portion 222a and the horizontal second concave portion 222b are orthogonal to each other, and a lattice pattern is formed by both. Of the plurality of vertical second concave portions 222a, two vertical second concave portions 222a are respectively connected to two orthogonal second concave portions 221 extending in the longitudinal direction. According to this embodiment, the same effect as the effect shown in the embodiment shown in FIGS.

In the embodiment shown in FIG. 4D, the second recess 22 is composed of two vertical second recesses 223a extending in the longitudinal direction and a plurality of horizontal second recesses 223b extending in the width direction. The vertical second concave portion 222a and the horizontal second concave portion 222b are orthogonal to each other. The horizontal second recess 222b is formed only between the vertical second recesses 223a so as to connect the two vertical second recesses 223a. The two vertical second concave portions 222a are respectively connected to the two straight second concave portions 221 extending in the longitudinal direction. According to this embodiment, the same effect as the effect shown in the embodiment shown in FIGS.

In the embodiment shown in FIG. 4 (e), four oblique second recesses 224a to 224d are connected to form a substantially rectangular shape. Each of the skew second recesses 224a to 224d is inclined with respect to the longitudinal direction. The skew second recess 224a and the skew second recess 224d have substantially the same length. Similarly, the skew second recess 224b and the skew second recess 224c have substantially the same length. One end of the skewed second recess 224b and one end of the skewed second recess 224c are at the same position P1. The other end of the skewed second recess 224b and one end of the skewed second recess 224a are at the same position P2. Further, the other end of the skewed second recess 224c and one end of the skewed second recess 224d are at the same position P3. The other end P4 of the skewed second recess 224a and the other end P5 of the skewed second recess 224d are connected to two straight second recesses 221 extending in the longitudinal direction, respectively. The second recess 22 of this embodiment passes through a position P1 where one end of the skewed second recess 224b and one end of the skewed second recess 224c are coupled, and extends in the longitudinal direction. It is symmetrical with respect to the line L. According to this embodiment, the same effect as the effect shown in the embodiment shown in FIGS.

In the embodiment shown in FIG. 4 (f), the second recess 22 has a connection body of a plurality of recesses that are all inclined with respect to the longitudinal direction. Specifically, the plurality of recesses have a short skew second recess 225a and a long skew second recess 225b respectively connected to the two straight second recesses 221 extending in the longitudinal direction. The skew second recess 225a and the skew second recess 225b are inclined at an angle that is symmetric with respect to the longitudinal direction. The skew second recess 225a and the skew second recess 225b extend from the end portion of the orthogonal second recess 221 toward the end portion of the absorber. A long skew second recess 225c extends from the position of the substantially middle point of the long skew second recess 225b. The direction of inclination of the skew second recess 225c is the same as the direction of inclination of the short skew second recess 225a. Furthermore, a short skewed second recess 225d extends from the substantially middle position of the long skewed second recess 225c. The direction of inclination of the short skew second recess 225d is the same as the direction of inclination of the long skew second recess 225b. According to this embodiment, the same effect as the effect shown in the embodiment shown in FIGS. Furthermore, since each skew 2nd recessed part does not cross, even if a wearer moves intensely, the effect that durability of the 2nd absorption part 12 can be improved is also show | played.

In the embodiment shown in FIG. 4G, the second recess 22 has a skewed second recess 226 extending in a zigzag shape in the longitudinal direction. And the edge part of each skew 2nd recessed part 226 is connected with the 2nd orthogonal | vertical 2nd recessed part 221 extended in a longitudinal direction, respectively. According to this embodiment, the same effect as the effect shown in the embodiment shown in FIG.

In the embodiment shown in FIG. 4 (h), the second recess 22 has an orthogonal second recess 227a that extends linearly in the longitudinal direction, and skewed

second recesses

227b and 227c that are inclined with respect to the longitudinal direction. ing. The oblique

second recesses

227b and 227c extend toward the end of the absorber starting from the same position in the orthogonal second recess 227a. The oblique

second recesses

227b and 227c extend so as to be symmetric with respect to the orthogonal second recess 227a. Three pairs of skewed

second recesses

227b and 227c are connected to one straight second recess 227a. And the end of the direct second recess 227a is connected to the two straight second recesses 221 extending in the longitudinal direction. According to this embodiment, the same effect as the effect shown in the embodiment shown in FIG.

In the embodiment shown in FIG. 4 (i), the second recess 22 has short skewed

second recesses

228 a and 228 b that branch from the ends of the two straight second recesses 221 extending in the longitudinal direction. The oblique

second recesses

228a, 228b extend from the end of the orthogonal second recess 221 toward the end of the absorber. The skewed

second recesses

228a and 228b have substantially the same length. The oblique

second recesses

228 a and 228 b extend so as to be symmetric with respect to the orthogonal second recess 221. The end of each skewed second recess 228b terminates at the same position P1. From the position P1, starting from this, long skew second recesses 228c and 228d, which are other skew recesses, extend. The oblique

second recesses

228c and 228d extend so as to be symmetric with respect to the longitudinal direction. The inclination angle of the skew second recess 228c is the same as the inclination angle of the skew second recess 228a. The inclination angle of the skew second recess 228d is the same as the inclination angle of the skew second recess 228b. According to this embodiment, the same effect as the effect shown in the embodiment shown in FIGS.

FIG. 4A to FIG. 4I show another embodiment of the second recess 22, and FIG. 5 shows another embodiment of the first recess 21. The first concave portion 21 shown in the figure extends in two parallel straight concave portions 211a extending in the longitudinal direction and from the front and rear ends of the direct concave portion 211a so as to draw a gentle curve outward in the width direction, And a curved concave portion 211b inclined with respect to the longitudinal direction. According to this embodiment, the absorber 10 not only fits the wearer's abdomen accurately, but also from the first absorbent portion 11 toward the widthwise ends of the second absorbent portion 12 and the third absorbent portion 13. There is an effect that the liquid can be transmitted efficiently and quickly. In this embodiment, the curved recess 211b extends from the front and rear ends of the direct recess 211a, but instead of the front and rear ends of the direct recess 211a, the end on the second absorbent portion 12 side. The curved recess 211b may extend only from the side. Or the curved recessed part 211b may be extended only from the edge part by the side of the 3rd absorption part 13. FIG.

FIG. 6 shows another embodiment of the third recess 23. The third recess 23 shown in the figure includes a single straight third recess 232a extending in the width direction and parallel to the width direction, and from the left and right ends of the direct third recess 232a. It has a curved third recess 232b extending so as to draw a gentle curve toward the recess 231 and inclined with respect to the longitudinal direction. The direct third recess 231 is connected to the first recess 21. According to this embodiment, not only does the absorbent body 10 accurately fit the wearer's abdomen, but also when the excreted liquid flows into the third absorbent section 13, the third recess 23 is beyond that of the liquid. The effect of blocking the flow of water is produced.

Next, the suitable manufacturing method of the absorber 10 of embodiment mentioned above is demonstrated. FIG. 7 shows an embodiment of a method for manufacturing the absorbent body 10 and a manufacturing apparatus used therefor. In the following description, the manufacturing apparatus of the absorbent body 10 includes a rotating drum 50 that is rotationally driven in the direction of arrow R1, and an absorption that includes a superabsorbent polymer and pulp as a raw material of the absorbent body 10 on the outer peripheral surface of the rotating drum 50. A duct 60 for supplying the conductive material 45, a transfer roll 70 that is disposed obliquely below and downstream of the rotary drum 50 and is driven to rotate in the direction of arrow R2, and a duct 60 and a transfer roll 70 in the circumferential direction of the rotary drum 50. , A mesh belt which is a sheet-like air-permeable member arranged so as to pass between the vacuum box 65 and the rotary drum 50 and between the transfer roll 70 and the rotary drum 50. 75 and a vacuum conveyor 80 disposed below the transfer roll 70.

As shown in FIG. 7, the saddle rotating drum 50 has a cylindrical shape, and receives power from a motor such as a motor, so that members forming the outer peripheral surface rotate around a horizontal axis. A space 56 capable of depressurizing the inside is formed in a non-rotating portion inside the rotating drum 50 (on the rotating shaft side). A known exhaust device (not shown) such as an intake fan is connected to the space 56, and the interior of the space 56 can be maintained at a negative pressure by operating the exhaust device. On the other hand, piping (not shown) capable of taking in air outside the apparatus is connected to the

spaces

57 and 58 on the inner side (rotating shaft side) of the rotating drum 50.

As shown in FIG. 7, a plurality of drum recesses 51 are formed on the outer peripheral surface of the rotating drum 50 at equal intervals in the R1 direction. As shown in FIGS. 8A and 8B, a mesh plate 52 having a large number of pores and a metal or resin impermeable member 53 are arranged on the bottom surface of each drum recess 51. Has been. The position of the upper end of the non-breathable member 53 affects the shape of the formed recess. Specifically, when the position of the upper end of the air-impermeable member 53 is lower than the position of the upper end of the frame body 50 ', a bottomed recess can be formed. On the other hand, when the position of the upper end of the air-impermeable member 53 is the same as the position of the upper end of the frame body 50 ′, a recessed portion penetrating in the thickness direction of the absorbent body 10 can be formed.

As shown in FIG. 8A, when the drum recess 51 is viewed along the axial direction X of the rotary drum 50, the mesh plate 52 is at the same depth as the drum recess 51. On the other hand, as shown in FIG. 8B, when the drum recess 51 is viewed along the rotation direction Y of the rotary drum 50, the mesh plate 52 is deeper than the depth of the drum recess 51. The depth is adjusted so that 51A and the shallow recessed part 51B which is relatively shallower than the deep recessed part 51A are formed.

The breathable member 53 is provided so as to protrude on the mesh plate 52 at any position of the deep recess 51A and the shallow recess 51B. The air-impermeable member 53 is disposed so as to correspond to the shape and position of the recess described above. The position of the upper end of the air-impermeable member 53 is the same in the deep recess 51A and the shallow recess 51B. As shown in FIGS. 8A and 8B, the region 54 composed only of the mesh plate 52 partitioned by the air-impermeable member 53 arranged in this way is a region other than the concave portion (that is, the convex portion) in the absorbent body 10. ) Is the part corresponding to. The portion of the outer peripheral surface of the rotary drum 50 where the drum recess 51 is not formed is composed of a frame body 50 'of the rotary drum 50 made of a metal rigid body. The frame body is impermeable.

As shown in FIG. 7, one end side of the duct 60 covers the outer peripheral surface of the rotary drum 50 positioned on the space 56 maintained at a negative pressure, and a fiber material introduction device is provided on the other end side (not shown). Have. The fiber material introducing device includes, for example, a pulverizer that pulverizes sheet-like wood pulp into defibrated pulp, and sends the defibrated pulp (fiber material) into the duct. A superabsorbent polymer introduction part to be introduced is provided.

The scissor transfer roll 70 has a cylindrical outer peripheral portion having air permeability, and receives the power from a prime mover such as a motor and the outer peripheral portion rotates in the R2 direction. In the non-rotating portion on the inner side (rotating shaft side) of the transfer roll 70, a space 71 that can be depressurized is formed. A known exhaust device (not shown) such as an intake fan is connected to the space 71, and the interior of the space 71 can be maintained at a negative pressure by operating the exhaust device.

The vacuum box 65 is arranged between the downstream end 61 of the duct 60 and the transfer roll 70 in the rotation direction R1 of the rotary drum 50. The vacuum box 65 has a box-like shape, and has an opening that opens in the direction of the rotating drum 50 at a portion facing the rotating drum 50. The vacuum box 65 is connected to a known exhaust device (not shown) such as an intake fan via an exhaust pipe 67, and the inside of the vacuum box 65 can be maintained at a negative pressure by the operation of the exhaust device. .

The mesh mesh belt 75 is a belt-shaped breathable belt having a mesh connected endlessly, and is continuously guided along a plurality of free rolls and transfer rolls 70 to move along a predetermined path. The mesh belt 75 is driven by the rotation of the transfer roll 70. While the mesh belt 75 passes in front of the opening of the vacuum box 65, the mesh belt 75 is in contact with the outer peripheral surface of the rotary drum 50, and the transfer roll 70 and the rotary drum 50 are closest to each other. In the vicinity of the portion, the transfer drum 70 moves away from the outer peripheral surface of the rotating drum 50.

The vacuum conveyor 80 includes an endless breathable belt 83 that is stretched over the drive roll 81 and the driven roll 82, and a vacuum box 84 that is disposed at a position facing the transfer roll 70 with the breathable belt 83 interposed therebetween. ing.

Next, a method for continuously manufacturing the absorber using the above-described absorber manufacturing apparatus will be described. First, the exhaust device connected to each of the space 56 in the rotary drum 50 and the vacuum box 65 is operated to make negative pressure. This is because such a negative pressure in the space 56 causes an air flow in the duct 60 to convey the liquid absorbent material 45 to the outer peripheral surface of the rotary drum 50. Next, the rotating drum 50 and the transfer roll 70 are rotated, and the vacuum conveyor 80 is operated. When the fiber material introducing device is operated to supply the fiber material and the superabsorbent polymer into the duct 60, the liquid absorbent material 45 rides on the air flow flowing through the duct 60 and is in a scattered state. It is supplied toward the outer peripheral surface of the rotating drum 50.

While the portion covered with the culvert duct 60 is being transported, the liquid absorbent material (mixture of pulp and superabsorbent polymer) 45 is sucked into the drum recess 51 of the rotary drum 50. As shown in FIG. 9, the liquid absorbing material 45 is gradually deposited on the mesh plate 52 in each region 54 and region 55 of the drum recess 51. In the deposit 46 thus obtained, a portion (a portion corresponding to the non-breathable member 53) 46 a formed by depositing the liquid-absorbing material 45 on the non-breathable member 53 is relatively deposited of the liquid-absorbent material 45. The amount of the liquid-absorbing material 45 is relatively large in other portions (corresponding to the region 54) 46b. As a result, when the deposit 46 is viewed as a whole, it has a concavo-convex structure along the axial direction of the rotary drum 50. On the other hand, when viewed along the rotating direction of the rotating drum 50, a relatively larger amount of pulp and superabsorbent polymer are deposited in the deep recess 51A shown in FIG. 8B than in the shallow recess 51B. As a result, the portion of the deposit 46 corresponding to the deep recess 51A has a higher basis weight as a whole deposit than the portion corresponding to the shallow recess 51B. In addition to this, the basis weight of the superabsorbent polymer and the basis weight of the pulp are higher in the portion corresponding to the deep recess 51A than in the portion corresponding to the shallow recess 51B.

When the rotary drum 50 rotates and the drum recess 51 comes to a position opposite to the vacuum box 65, the deposit 46 in the drum recess 51 is sucked to the mesh belt 75 by suction from the vacuum box 65. . In this state, the deposit 46 in the drum recess 51 is conveyed to a position immediately before the closest portion between the transfer roll 70 and the rotary drum 50, and is sucked from the transfer roll 70 side in the vicinity of the closest portion to the mesh belt. The mold is released from the drum recess 51 while being sucked by 75 and moved onto the transfer roll 70.

In this way, the deposit 46 having the concavo-convex structure transferred onto the transfer roll 70 together with the mesh belt 75 is adsorbed to the mesh belt 75 on the transfer roll 70 while being transferred to the vacuum conveyor 80 (the lowermost end of the transfer roll 70). And is transferred to the vacuum conveyor 80 by suction by the vacuum box 84 at the delivery section.

長 The elongated deposit 46 obtained in this way is cut at a predetermined interval to continuously produce the absorber precursor 49. The cross section in the thickness direction along the longitudinal direction of the obtained absorber precursor 49 is as shown in FIG. 10 (a), and has a high basis weight portion 49a having a large thickness and a high basis weight, and a high basis weight. The low basis weight part 49b whose thickness is smaller than the quantity part 49a and whose basic weight is low is in the state connected along the longitudinal direction. Further, on the lower surface of the absorber precursor 49 shown in the figure, that is, the surface facing the mesh plate 52, a recessed portion 49c that is recessed toward the upper surface side is formed. The absorber precursor 49 having such a structure is compressed by the pressurizing means 90, and the thickness of the deposit 46 constituting the absorber precursor 49 is actively reduced, so that the intended absorber 10 is obtained. obtain. As shown in FIG. 7, the pressurizing means 90 includes a pair of

rolls

91 and 92 having at least one smooth surface, and pressurizes an object to be pressed introduced between the

rolls

91 and 92 from above and below in the thickness direction. It is configured to be compressible.

When the absorber precursor 49 is compressed by the soot pressurizing means 90, the following changes occur. First, when the absorber precursor 49 is viewed along the width direction thereof, that is, along the axial direction of the rotary drum 50, the portion (area 54 corresponding portion) 46 b having a relatively large liquid-absorbing material 45 and a large thickness is absorbed. The liquid material 45 is compressed more strongly than the portion (a portion corresponding to the air-impermeable member 53) 46a having a relatively small thickness and a small thickness. As a result, a convex portion having a high basis weight and a high apparent density is formed from the portion 46b. Further, a recess having a low basis weight and a low apparent density is formed from the portion 46a.

On the other hand, when the absorber precursor 49 is viewed along its longitudinal direction, that is, the rotation direction of the rotary drum 50, the high basis weight portion 49a having a large thickness is compressed more strongly than the low basis weight portion 49b having a small thickness. . As a result, as shown in FIG.10 (b), in the absorber 10 obtained, the site | part 101 with a high basic weight and a high apparent density is formed from the high basic weight part 49a. Moreover, the site | part 102 with a low basic weight and a low apparent density originates in the low basic weight part 49b. The part 101 includes the second absorption part 12 in the absorbent body 10 and a part of the first absorption part 11 adjacent to the second absorption part 12. The part 102 includes the third absorption part 13 in the absorbent body 10 and a part of the first absorption part 11 adjacent to the third absorption part 13. And the boundary of the site | part 101 and the site | part 102 becomes the boundary part K (refer FIG. 1) mentioned above.

As apparent from the above description, in manufacturing the absorbent body 10, the boundary portion K is formed at a desired position in the absorbent body 10 by adjusting the depth of the mesh plate 52 in the drum recess 51 of the rotary drum 50. be able to.
The absorber 10 can be manufactured as a single layer structure by the above manufacturing method and manufacturing apparatus. Moreover, each layer of a multilayered structure can be manufactured by the above-mentioned or normal manufacturing method and manufacturing apparatus, and then the multilayered absorbent body 10 can be manufactured by laminating the respective layers.
Moreover, it is preferable to pressurize the absorber precursor 49, but it is not always necessary to pressurize, and the absorber 10 may be used as it is.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, the range of this invention is not restrict | limited to the said embodiment. For example, although the said embodiment is an example which applied the absorber and absorbent article of this invention to the deployment type disposable diaper, this invention is absorbent articles other than a deployment type disposable diaper, for example, an underpants type absorbent article. The same can be applied to the above.

In each of the above-described embodiments, the

recesses

21, 22, and 23 are formed on the second surface 10b of the absorbent body 10. Instead, the recesses are formed on the first surface 10b, and the first You may incorporate in an absorbent article so that a surface may oppose a wearer's skin.

In addition, the above-described embodiments can be combined or replaced with each other. Moreover, you may use the 2nd recessed part 22 of the form shown to Fig.4 (a) thru | or (i) as a form of the 3rd recessed part 23. FIG.

に関し Regarding the embodiment described above, the present invention further discloses the following absorbent body and absorbent article.

<1> An absorbent body of an absorbent article comprising a pulp and a superabsorbent polymer, having a longitudinal direction and a width direction perpendicular thereto.
The absorber has at least a monolayer structure portion,
When the absorbent body is divided into three parts in the longitudinal direction, the first absorbent part located in the center, the second absorbent part and the third part extending from the first absorbent part forward and backward in the longitudinal direction, respectively. Divided into absorption parts,
The basis weight of the superabsorbent polymer present in the second absorbent part is higher than the basis weight of the superabsorbent polymer present in the third absorbent part,
A first recess extending in one direction is formed on the surface of the first absorption part,
The end of the first recess extending in one direction does not reach the side edge of the absorber, and the extending direction faces the longitudinal direction of the absorber.
A second recess is formed on the surface of the second absorption portion, which is continuous from at least the first recess and extends in the longitudinal direction of the absorber,
An absorbent body of an absorbent article, wherein the first recess and the second recess are formed on the same surface of the absorbent body.

The <2> 1st recessed part is an absorber as described in said <1> which is lower basic weight than parts other than the 1st recessed part in a 1st absorption part.
<3> The absorbent body according to <1> or <2>, wherein the second absorbent portion is located over the entire width direction of the absorbent body.
<4> The absorbent body according to any one of <1> to <3>, wherein a thickness of the second absorbent portion is thinner than a thickness of a portion other than the first concave portion in the first absorbent portion.

<5> The absorbent body according to any one of <1> to <4>, wherein a boundary surface of uneven distribution of the superabsorbent polymer is gradually changed.
<6> The absorbent body according to any one of <1> to <3>, wherein the first recess extends only in a longitudinal direction of the absorbent body.
<7> A part of the second recess is connected to the first recess, and the end of the second recess does not reach the side edge of the absorber. Any of <1> to <6> Or an absorber according to claim 1;

<8> The second recess portion of the second absorption portion further includes a skew recess portion extending in one direction, and the extending direction is inclined with respect to the longitudinal direction of the absorber. <1> to <7 The absorber of any one of>.
<9> The second recess portion of the second absorption portion further includes another skew recess portion extending in a direction intersecting with the skew recess portion, the extending direction being inclined with respect to the longitudinal direction. 8>.
<10> When the basis weight of the superabsorbent polymer present in the third absorbent part is 1, the basis weight of the superabsorbent polymer present in the second absorbent part is greater than 1 and less than 2.5. The absorber according to any one of <1> to <9>.

<11> The absorbent body according to any one of <1> to <10>, wherein the first recess and the second recess are arranged on the non-skin surface side.
<12> When the basis weight of the superabsorbent polymer present in the third absorbent part is 1, the basis weight of the superabsorbent polymer present in the second absorbent part 12 is preferably greater than 1. 2 or more, more preferably 1.5 or more, preferably less than 2.5, more preferably 2.3 or less, and further preferably 2.0 or less. The absorber according to any one of the above items <1> to <11>.
The lower limit value of the basis weight of the superabsorbent polymer in the <13> second absorbent part is preferably 175 g / m ² , more preferably 200 / m ² , and even more preferably 225 g / m ^2. The upper limit is preferably 375 / m ² , more preferably 350 g / m ² , and even more preferably 325 / m ² , according to any one of the above <1> to <12> Absorber.

<14> The lower limit value of the basis weight of the superabsorbent polymer in the third absorbent part is preferably 50 g / m ² , more preferably 75 g / m ² , and even more preferably 100 g / m ^2. , upper limit thereof is preferably 200 g / ^{m 2,} more preferably from 175 g / ^{m 2,} to a more preferred wherein <1> not be 150 g / ^{m 2} according to any one of <13> Absorber.
<15> The absorption according to any one of <1> to <14>, wherein the basis weight of the pulp present in the second absorbent portion is higher than the basis weight of the pulp present in the third absorbent portion 13. body.
<16> When the basis weight of the pulp present in the third absorbent portion is 1, the basis weight of the pulp present in the second absorbent portion is preferably greater than 1, and more preferably 1.2 or more. 1.5 or more, more preferably less than 3.0, still more preferably 2.5 or less, and even more preferably 2.0 or less. <1> to <15 The absorber of any one of>.
<17> The basis weight ratio between the superabsorbent polymer and the pulp in the second absorbent part (superabsorbent polymer basis weight / pulp basis weight) is the basis weight ratio between the superabsorbent polymer and the pulp in the third absorbent part. The lower limit of the basis weight ratio with the superabsorbent polymer is preferably 0.6, more preferably 0.8, even more preferably 1.0, and the upper limit is The absorber according to any one of <1> to <16>, preferably 3.0, more preferably 2.5, and still more preferably 2.0.
<18> On the surface of the third absorbent portion, a third concave portion that is continuous from at least the first concave portion and extends in the longitudinal direction of the absorber is formed,
The absorbent body according to any one of <1> to <17>, wherein the third concave portion, the first concave portion, and the second concave portion are formed on the same surface of the absorbent body.

<19> The third recessed portion of the third absorbing portion further has a recessed portion extending in one direction, and the extending direction intersects with the longitudinal direction of the absorber at an angle of more than 0 degree and not more than 90 degrees. The absorber as described in said <18>.
<20> For the total sum of the lengths of all the third recesses, among the third recesses, the sum of the lengths of the recesses intersecting the longitudinal direction of the absorber at an angle of more than 0 degrees and less than 90 degrees The absorber according to <18> or <19>, wherein the ratio is 80% or more.
<21> The absorption according to any one of <1> to <20>, wherein the surface of the absorbent body has a pulp layer having a smaller basis weight of the superabsorbent polymer than other portions in the thickness direction. body.
<22> The absorbent body according to <21>, wherein the pulp layer and the open side of the first concave portion and the second concave portion are formed on the same surface of the absorbent body.
<23> The absorbent according to <21> or <22>, wherein the pulp layer overlaps only with a portion other than the first recess and the second recess in the thickness direction.

<24> The absorbent body according to any one of <21> to <23>, wherein the basis weight of the pulp layer is 50 g / m ² or less.
<25> The absorbent body according to any one of <21> to <24>, wherein the pulp layer is formed only of pulp.
The basis weight of the superabsorbent polymer of the site | part connected with the 2nd absorption part among the <26> 1st absorption parts is the same as the basis weight of the high absorption polymer of the 2nd absorption part,
Of the first absorbent part, the basis weight of the superabsorbent polymer at the site connected to the third absorbent part is the same as the basis weight of the superabsorbent polymer of the third absorbent part,
In the first absorption part, when the boundary part where the basis weight of the superabsorbent polymer is changed bisects the single-layer structure part in the longitudinal direction, the third absorption includes the position of the bisector. The absorbent body according to any one of <1> to <25>, which is located closer to the part.
<27> The basis weight of the superabsorbent polymer in the entire area of the first absorbent part is the same as the basis weight of the superabsorbent polymer in the second absorbent part, and the superabsorbent polymer in the second absorbent part The boundary portion between the portion that is the same as the basis weight of the first absorbent portion 11 and the portion that is the same as the basis weight of the superabsorbent polymer in the third absorbent portion is the first absorbent portion 11 and the third absorbent portion 13. <1> thru | or <26> any one of the absorbers which correspond to the boundary part.
<28> The basis weight of the superabsorbent polymer in the entire area of the first absorbent portion is the same as the basis weight of the superabsorbent polymer in the second absorbent portion, and among the third absorbent portions, the first The basis weight of the superabsorbent polymer at the site connected to the absorbent part is the same as the basis weight of the superabsorbent polymer in the first absorbent part, and the superabsorbent polymer in the second absorbent part <1> thru | or the boundary part of the site | part which is the same as the basic weight of the superabsorbent polymer in the 3rd absorption part 13 and the site | part which is the same as a basic weight exists in a 3rd absorption part. <27> The absorber according to any one of the above.

<29> The absorber according to any one of <1> to <28>, wherein the absorber includes only a single-layer structure portion.
<30> The second concave portion includes a skewed concave portion extending in a direction inclined with respect to the longitudinal direction of the absorber, and among the second concave portions with respect to the total length of all the second concave portions, The absorbent body according to any one of <1> to <29>, wherein a ratio of a total length of the oblique recesses is 70% or more.
<31> The absorbent body according to any one of <1> to <30>, wherein the absorbent body has a surface having no unevenness in a longitudinal direction.
<32> The absorption according to any one of <1> to <30>, wherein two or more first concave portions are provided in the longitudinal direction of the absorber and penetrate through the thickness direction of the absorber. body.
<33> Absorption comprising the absorbent body according to any one of <1> to <32>, wherein the second absorbent section of the absorbent body is disposed on the ventral side, and the third absorbent section is disposed on the back side. Sex goods.

Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited to such examples. Unless otherwise specified, “%” means “mass%”.

[Example 1]
Using the apparatus shown in FIG. 7, two absorbers having a single-layer structure were manufactured, and the absorbers having the form shown in FIG. 11 were manufactured by stacking them. As raw materials for the absorber, fluff pulp and polyacrylic acid-based superabsorbent polymer were used. The absorbent body formed by the lamination had a length of 390 mm, a width of 120 mm, and a thickness of 6 mm.
A pair of linear first recesses were formed in the first absorption portion along the longitudinal direction. The first recess has a length of 190 mm, a width of 10 mm, and a depth of 6 mm. The interval between the first recesses was 20 mm, and was formed symmetrically with respect to the longitudinal center line of the absorber.
In the second absorption portion, the first recess extends to the second absorption portion, and a perpendicular second recess having a length of 25 mm, a width of 10 mm, and a depth of 6 mm along the longitudinal direction was formed. Further, the second absorption part has an oblique grid shape inclined by plus or minus 45 degrees with respect to the longitudinal center line of the absorber, and an oblique grid-like second recess having a width of 5 mm and a depth of 4 mm is formed. . Of the inclined second recesses, the one inclined by plus 45 degrees and the one inclined by minus 45 degrees were formed to intersect each other at the central portion in the longitudinal direction of each recess. The interval between the oblique second recesses was 10 mm. One end of the skewed second recess was connected to the orthogonal second recess, and the other end was terminated at a position of 10 mm inward from the end edge on the second absorption portion side. In the second absorbent portion, a total of six recesses were formed by combining the straight second recesses and the oblique second recesses.
In the third absorbent portion, the first concave portion extended to the third absorbent portion, and an orthogonal third concave portion having a length of 25 mm, a width of 10 mm, and a depth of 6 mm along the longitudinal direction was formed. Further, the third absorption portion is formed with an oblique third concave portion having a width of 5 mm and a depth of 4 mm, having an oblique lattice shape inclined by plus or minus 45 degrees with respect to the longitudinal center line of the absorber. Of the oblique third recesses, the one inclined by plus 45 degrees and the one inclined by minus 45 degrees were made to intersect each other at the central portion in the longitudinal direction of each recess. The interval between the oblique third recesses was 10 mm. One end of the oblique third recess is connected to the orthogonal third recess, and the other end is terminated at a position 10 mm inward from the end edge on the third absorption portion side. In the third absorption part, a total of six recesses were formed by combining the straight third recesses and the oblique third recesses.
The basis weights of the pulp and superabsorbent polymer in the first absorbent part, the second absorbent part, and the third absorbent part were as shown in Table 1 below. The position of the boundary portion K was as shown in the table.

[Example 2]
The form of the 3rd absorption part was changed as shown in FIG. 11, and the basis weight of the pulp and superabsorbent polymer in each absorption part was as shown in Table 1. Except these, it carried out similarly to Example 1, and obtained the absorber.
In the third absorbent portion in this example, a pair of linear widthwise third recesses were formed in parallel with the width direction of the absorber, in addition to the orthogonal third recesses extending from the first recess. The third recess in the width direction had a length of 100 mm, a width of 5 mm, and a depth of 4 mm, and was formed symmetrically with respect to the center line in the longitudinal direction of the absorber. Of the pair of widthwise third recesses, the distance between the widthwise third recess located on the side closer to the direct third recess and the end of the direct third recess was 25 mm. On the other hand, among the pair of width-direction third recesses, the distance between the width-direction third recess located on the side close to the edge of the third absorption portion and the edge of the third absorption portion was 20 mm. In the third absorbent portion, a total of four concave portions were formed by combining the direct third concave portion and the widthwise third concave portion.

[Examples 3, 4 and 7]
The form of the 3rd absorption part was changed as shown in FIG. 11, and the basis weight of the pulp and superabsorbent polymer in each absorption part was as shown in Tables 1 and 2. Except these, it carried out similarly to Example 1, and obtained the absorber.
In the third absorption portion in this example, only the orthogonal third recess extending from the first recess was formed, and no other third recess was formed.

[Examples 5, 11 and 12]
A single layer structure absorber is manufactured using the apparatus shown in FIG. 7, the form of the third absorbent part is changed as shown in FIGS. 11 and 12, and the basis weight of the pulp and the superabsorbent polymer in each absorbent part The amounts were as shown in Tables 2 and 3. Except these, it carried out similarly to Example 1, and obtained the absorber.
In the third absorption portion in this example, only the orthogonal third recess extending from the first recess was formed, and no other third recess was formed.

Example 6
The form of the 2nd absorption part and the 3rd absorption part was changed as shown in FIG. 11, and the basis weight of the pulp and superabsorbent polymer in each absorption part was as shown in Table 6. Except these, it carried out similarly to Example 1, and obtained the absorber.
In the second absorbent portion in this embodiment, in addition to the orthogonal second concave portion extending from the first concave portion, an oblique second concave portion inclined by plus or minus 45 degrees with respect to the longitudinal center line of the absorber is formed. . Of the oblique second recesses, the one inclined by plus 45 degrees and the one inclined by minus 45 degrees were connected to each other at the end portion on the first absorption part side of each recess. In the second absorbent portion, a total of six recesses were formed by combining the straight second recesses and the oblique second recesses.
In the third absorption portion in this example, only the orthogonal third recess extending from the first recess was formed, and no other third recess was formed.

Example 8
The form of the 2nd absorption part and the 3rd absorption part was changed as shown in FIG. 11, and the basis weight of the pulp and superabsorbent polymer in each absorption part was as shown in Table 2. Except these, it carried out similarly to Example 1, and obtained the absorber.
In the 2nd absorption part in a present Example, the 1st absorption part side edge part of the skew 2nd recessed part was not connected with the orthogonal 2nd recessed part.
In the third absorption portion in this example, only the orthogonal third recess extending from the first recess was formed, and no other third recess was formed.

Example 9
A single layer structure absorber is manufactured using the apparatus shown in FIG. 7, the form of the third absorbent part is changed as shown in FIG. 12, and the basis weight of the pulp and the superabsorbent polymer in each absorbent part is shown. As shown in FIG. Except these, it carried out similarly to Example 1, and obtained the absorber. Further, the front and back surfaces of the obtained absorbent body were opposite to those of Example 1, that is, the openings of the concave portions were directed to the skin surface side.
In the third absorption portion in this example, only the orthogonal third recess extending from the first recess was formed, and no other third recess was formed.

Example 10
The form of the 2nd absorption part and the 3rd absorption part was changed as shown in FIG. 12, and the basis weight of the pulp and superabsorbent polymer in each absorption part was as shown in Table 3. Except these, it carried out similarly to Example 1, and obtained the absorber.
In the second absorbent portion in this embodiment, in addition to the orthogonal second concave portion extending from the first concave portion, an oblique second concave portion inclined by plus or minus 45 degrees with respect to the longitudinal center line of the absorber is formed. . Of the skew second recesses, the one inclined by plus 45 degrees and the one inclined by minus 45 degrees were formed to intersect each other in the vicinity of the end portion on the first absorption portion side of each recess. In the second absorbent portion, a total of six recesses were formed by combining the straight second recesses and the oblique second recesses.
In the third absorption portion in this example, only the orthogonal third recess extending from the first recess was formed, and no other third recess was formed.

Example 13
The form of the 2nd absorption part and the 3rd absorption part was changed as shown in FIG. 12, and the basis weight of the pulp and superabsorbent polymer in each absorption part was as shown in Table 4. Except these, it carried out similarly to Example 1, and obtained the absorber.
In the second absorption part in this example, a pair of linear second widthwise recesses parallel to the widthwise direction of the absorber was formed in addition to the orthogonal second recesses extending from the first recess. In the second absorbent portion, a total of four concave portions were formed by combining the perpendicular second concave portion and the width-direction second concave portion.
In the third absorption portion in this example, a pair of linear widthwise third recesses parallel to the width direction of the absorber was formed in addition to the orthogonal third recesses extending from the first recess. In the third absorbent portion, a total of four concave portions were formed by combining the direct third concave portion and the widthwise third concave portion.

Example 14
The form of the 2nd absorption part and the 3rd absorption part was changed as shown in FIG. 12, and the basis weight of the pulp and superabsorbent polymer in each absorption part was as shown in Table 4. Except these, it carried out similarly to Example 1, and obtained the absorber.
In the second absorption part in this example, only the direct second recess extending from the first recess was formed, and no other second recess was formed.
In the third absorption portion in this example, only the orthogonal third recess extending from the first recess was formed, and no other third recess was formed.

Example 15
The form of the 1st absorption part, the 2nd absorption part, and the 3rd absorption part was changed as shown in FIG. 12, and the basis weight of the pulp and superabsorbent polymer in each absorption part was as shown in Table 4. Except these, it carried out similarly to Example 1, and obtained the absorber.
In the first absorption part in this example, a total of ten grid-shaped first recesses extending in the longitudinal direction and the width direction of the absorber were formed. The concave portion extending in the longitudinal direction was formed into four straight lines having a length of 190 mm, a width of 10 mm, and a depth of 6 mm. The concave portion extending in the width direction was a straight line of six strips, and had a length of 100 mm, a width of 5 mm, and a depth of 4 mm.
A total of six strip-shaped second recesses extending in the longitudinal direction and the width direction of the absorbent body were formed in the second absorption portion in this example. The orthogonal second concave portion extending from the first concave portion was formed into four strips, and had a length of 65 mm, a width of 10 mm, and a depth of 6 mm. The interval between the recesses was 15 mm, and was formed symmetrically with respect to the longitudinal center line of the absorber. Two linear second recesses in the width direction parallel to the width direction of the absorber were formed to have a length of 100 mm, a width of 5 mm, and a depth of 4 mm. The interval between the recesses was 30 mm and was formed symmetrically with respect to the longitudinal center line of the absorber.
In the third absorbent portion in this example, a total of six strip-shaped third recesses extending in the longitudinal direction and the width direction of the absorbent body were formed. The orthogonal third concave portion extending from the first concave portion was formed into four strips having a length of 65 mm, a width of 10 mm, and a depth of 6 mm. The interval between the recesses was 15 mm, and was formed symmetrically with respect to the longitudinal center line of the absorber. Two linear widthwise third recesses parallel to the widthwise direction of the absorber were formed to have a length of 100 mm, a width of 5 mm, and a depth of 4 mm. The interval between the recesses was 30 mm and was formed symmetrically with respect to the longitudinal center line of the absorber.

[Comparative Example 1]
Table 4 shows the basis weight of the pulp and superabsorbent polymer in each absorbent part without forming a recess in each absorbent part. Except these, it carried out similarly to Example 1, and obtained the absorber.

[Comparative Example 2]
The form of the 1st absorption part is changed as shown in FIG. 12, a recessed part is not formed in a 2nd absorption part and a 3rd absorption part, and the basic weight of the pulp and superabsorbent polymer in each absorption part is shown in Table 4. As shown. Except these, it carried out similarly to Example 1, and obtained the absorber.
In the first absorption part in this comparative example, a total of two strips of a pair of linear first recesses extending along the longitudinal direction of the absorber were formed. The concave portion had a length of 150 mm, a width of 10 mm, and a depth of 6 mm. The interval between the recesses was 20 mm, and was formed symmetrically with respect to the longitudinal center line of the absorber.

[Evaluation]
After covering the whole of the absorbent bodies obtained in Examples and Comparative Examples with a tissue paper having a basis weight of 16 g / m ² , one side of the absorbent body is covered with a top sheet, and the other side is covered with a back sheet. Coated and produced disposable diapers. The absorbent body and the tissue paper were joined with a hot melt adhesive. Moreover, the surface sheet and the back surface sheet joined the site | part extended from the periphery of the absorber with the hot-melt adhesive. As the top sheet and the back sheet, the same sheets as those used in “Merry's” (registered trademark), which is a disposable diaper manufactured by Kao Corporation, were used. About the diaper obtained in this way, the maximum absorption amount, liquid return amount, absorption time, fit property, granular feeling and cushioning property were measured and evaluated by the following methods. The results are shown in Tables 1 to 4 below.

[Maximum absorption]
A diaper with the top sheet facing upward was placed on a sloped base at an angle of 30 °, and 0.9% saline was injected at a rate of 5 g / sec. The injection position was 130 mm inside from the end of the absorber positioned on the upper side toward the crotch side. After completion of the injection, it was left for 5 minutes. Next, the diaper was transferred to a slope base having an angle of 10 °, and the top sheet was placed on the slope base with the top sheet facing upward. A weight of 6 kg (press surface 300 cm ² ) was placed on the top sheet, and the diaper was pressed and left for 5 minutes. The weight was removed after 5 minutes. Thereafter, these operations were repeated. The process was repeated until the diaper could not hold 0.9% saline and leaked. Then, the total amount of 0.9% saline solution that did not leak even when pressurized was taken as the maximum absorption amount. The above measurements were performed when the diaper's ventral side was positioned above the slope base and when the back side was positioned above the slope base. And the relative value when the maximum absorption amount of the comparative example 1 was set to 1.0 was computed using the following formulas.
Maximum absorption (relative value) = (maximum absorption of sample) / (maximum absorption of comparative example 1)
The larger the maximum absorption amount (relative value), the higher the absorption amount and the higher the evaluation.

[Liquid return amount and absorption time]
A cylinder with an inner diameter of 35 mm was placed at the center in the longitudinal direction of the absorbent body in the diaper and in the center in the width direction, and 40 g of physiological saline was injected while maintaining the liquid surface height at 10 mm. An acrylic plate having a size capable of covering the entire diaper is provided at the bottom of the cylinder (thickness 5 mm, length 250 mm, width 100 mm). After 10 minutes from the start of absorption, 40 g was injected again. This operation was repeated four times to absorb a total of 160 g of physiological saline. Prepare a filter paper (Advantech No. 5C) cut to 100 mm x 100 mm in advance and stack 16 sheets (mass measurement W1), 10 minutes after starting the fourth injection, centering on the injection point Was put on the absorbent body and a pressure of 3.5 kPa was applied to absorb the physiological saline on the filter paper. After 2 minutes, the mass of the filter paper was measured (W2), and the liquid return amount was calculated from the following equation.
Liquid return amount (g) = mass of filter paper after pressurization (W2) −mass of first filter paper (W1)
The relative value when the liquid return amount of Comparative Example 1 was 1.0 was calculated using the following calculation formula.
Liquid return amount (relative value) = (Liquid return amount of sample) / (Liquid return amount of Comparative Example 1)
The smaller the liquid return amount (relative value), the smaller the liquid return amount and the higher the evaluation.
In the measurement of the above liquid return amount, the time until the whole amount of physiological saline moved from the cylinder to the inside of the absorber was measured in the fourth physiological saline injection operation, and this time was taken as the absorption time. And the relative value when the absorption time of the comparative example 1 was set to 1.0 was computed using the following formulas.
Absorption time (relative value) = (absorption time of sample) / (absorption time of comparative example 1)
The smaller the absorption time (relative value), the faster the absorption time, and the higher the evaluation.
The liquid return amount and the absorption time are absorption performance that should be emphasized over the maximum absorption amount.

[Fitness]
The absorber was cut into three regions: a first absorption part, a second absorption part, and a third absorption part. The cutting position was set to a position inside 1/4 of the entire length from the front and rear end portions in the longitudinal direction of the absorbent body toward the crotch side. The bending rigidity of each cut absorption part was measured using a handometer (model: HOM-3) manufactured by Daiei Kagaku Seiki Seisakusho. The slit width of the handometer was set to 30 mm. Specifically, the cut absorption part was rotated by 10 degrees, the load value at each angle was measured, and the average of the load values was calculated. This average value was used as a scale representing fit. And the relative value when the fitting property of the comparative example 1 was set to 1.0 was computed using the following formulas.
Fit property (relative value) = (fit property of sample) / (fit property of Comparative Example 1)
The smaller the fit (relative value), the better the flexibility and the higher the evaluation.

[Graininess]
In the diaper provided with the absorber, the part corresponding to the second absorbent part was grasped with both hands so as to be symmetrical with respect to the longitudinal direction of the diaper. At this time, the thumb was placed on the surface material side, the remaining four fingers were placed on the back sheet side, and the graininess attributed to the superabsorbent polymer was evaluated by strongly compressing with the thumb. To feel grainy is to feel a slight pain when compressed with your thumb. Evaluation was made into the three-stage sensory value of A, B, and C. The evaluation can be performed using any method such as evaluating the same diaper 10 times, evaluating 10 different diapers, or evaluating 5 times with one diaper and 5 times with another diaper. I do not care. This sensory evaluation becomes higher in the order of A, B, and C.
A: A different place is pushed 10 times, and a graininess is not felt at all.
B: Press a different place 10 times to feel graininess 1-5 times.
C: Press a different place 10 times and feel the graininess 6-10 times.

[Cushioning]
In the diaper provided with the absorbent body, the portion corresponding to the second absorbent portion was grasped with both hands so as to be the left and right objects in the longitudinal direction of the diaper. At this time, the cushion was evaluated by placing the thumb on the surface material side and holding the remaining four fingers on the back sheet side and compressing strongly with the thumb. The feeling of cushioning is strongly expressed by feeling a compressible convex portion in a concave portion where the thumb cannot be compressed when the concave portion and the convex portion coexist at a certain interval. That is, a cushioning property is not exhibited in a flat absorbent body without unevenness. Evaluation was made into the three-stage sensory value of A, B, and C. The evaluation can be performed using any method such as evaluating the same diaper 10 times, evaluating 10 different diapers, or evaluating 5 times with one diaper and 5 times with another diaper. I do not care. This sensory evaluation becomes higher in the order of A, B, and C.
A: A different place is pressed 10 times, and the cushioning property is felt 6 to 10 times.
B: Press a different place 10 times and feel cushioning 1-5 times.
C: A separate place is pushed 10 times and no cushioning is felt.

As is apparent from the results shown in Tables 1 to 4, it can be seen that each example has a larger maximum absorption amount, a smaller liquid return amount, and a shorter absorption time than the comparative example. It can also be seen that the fit is good, the graininess is small, and the cushioning is felt.

ADVANTAGE OF THE INVENTION According to this invention, the diffusion rate of the excreted liquid is high, the excreted liquid can be rapidly absorbed, and the absorber and the absorbent article with favorable fitting property to a wearer's body are provided. .

Claims

An absorbent article for absorbent articles comprising pulp and a superabsorbent polymer, having a longitudinal direction and a width direction perpendicular thereto.
The absorber has at least a monolayer structure portion,
When the absorbent body is divided into three parts in the longitudinal direction, the first absorbent part located in the center, the second absorbent part and the third part extending from the first absorbent part forward and backward in the longitudinal direction, respectively. Divided into absorption parts,
The basis weight of the superabsorbent polymer present in the second absorbent part is higher than the basis weight of the superabsorbent polymer present in the third absorbent part,
A first recess extending in one direction is formed on the surface of the first absorption part,
The end of the first recess extending in one direction does not reach the side edge of the absorber, and the extending direction faces the longitudinal direction of the absorber.
A second recess is formed on the surface of the second absorption portion, which is continuous from at least the first recess and extends in the longitudinal direction of the absorber,
An absorbent body of an absorbent article, wherein the first recess and the second recess are formed on the same surface of the absorbent body.
The absorbent body according to claim 1, wherein the first concave portion has a lower basis weight than a portion of the first absorbent portion other than the first concave portion.
The absorber according to claim 1 or 2, wherein the second absorber is located on the entire width direction of the absorber.
The absorbent body according to any one of claims 1 to 3, wherein the first recess extends only in a longitudinal direction of the absorbent body.
5. The second recess portion of the second absorption portion further includes a skew recess portion extending in one direction and extending in an inclined direction with respect to the longitudinal direction of the absorber. The absorber according to item.
When the basis weight of the superabsorbent polymer present in the third absorbent part is 1, the basis weight of the superabsorbent polymer present in the second absorbent part is greater than 1 and less than 2.5. Item 6. The absorbent body according to any one of Items 1 to 5.
The absorbent body according to any one of claims 1 to 6, wherein the first concave portion and the second concave portion are disposed on the non-skin surface side.
A third recess is formed on the surface of the third absorption part, which is continuous from at least the first recess and extends in the longitudinal direction of the absorber,
The absorber according to any one of claims 1 to 7, wherein the third recess, the first recess, and the second recess are formed on the same surface of the absorber.
The third recessed portion of the third absorbent portion further has a recessed portion that extends in one direction, and the extending direction intersects with the longitudinal direction of the absorbent body at an angle of more than 0 degree and not more than 90 degrees. The absorber as described in.
Ratio of the sum total of the lengths of the third recesses intersecting the longitudinal direction of the absorber at an angle of more than 0 degrees and 90 degrees or less with respect to the total length of all the third recesses The absorber according to claim 9, wherein is 80% or more.
The absorbent body according to any one of claims 1 to 10, wherein the absorbent body has a pulp layer in which the basis weight of the superabsorbent polymer is smaller than that of other portions in the thickness direction on the surface of the absorbent body.
Of the first absorbent part, the basis weight of the superabsorbent polymer at the site connected to the second absorbent part is the same as the basis weight of the superabsorbent polymer of the second absorbent part,
Of the first absorbent part, the basis weight of the superabsorbent polymer at the site connected to the third absorbent part is the same as the basis weight of the superabsorbent polymer of the third absorbent part,
In the first absorption part, when the boundary part where the basis weight of the superabsorbent polymer is changed bisects the single-layer structure part in the longitudinal direction, the third absorption includes the position of the bisector. The absorber according to any one of claims 1 to 11, which is located closer to the part.
The absorber according to any one of claims 1 to 12, wherein the absorber comprises only a single-layer structure portion.
The second concave portion includes a concave portion extending in a direction inclined with respect to the longitudinal direction of the absorber, and the second concave portion is inclined with respect to the sum of the lengths of all the second concave portions. The absorber according to any one of claims 1 to 13, wherein the ratio of the sum of the lengths of the two recesses is 70% or more.
The absorbent body according to any one of claims 1 to 14, wherein two or more first recesses are provided in the longitudinal direction of the absorbent body and penetrate through the thickness direction of the absorbent body.
An absorbent article comprising the absorbent body according to any one of claims 1 to 15, wherein the second absorbent portion of the absorbent body is disposed on the ventral side, and the third absorbent portion is disposed on the back side.