JP6159637B2 - Absorbent articles - Google Patents

Description

  The present invention relates to absorbent articles such as paper diapers, sanitary napkins, incontinence pads, and the like, and more particularly, to absorbent articles excellent in excretory fluid absorbability.

As an absorbent article, for example, disposable paper diapers that absorb excretory fluids such as urine include a liquid-permeable sheet (so-called top sheet) located on the wearer's skin side and a liquid-impermeable sheet located on the clothes side. Generally, a sheet (so-called back sheet) and an absorbent body provided between the liquid-permeable sheet and the liquid-impermeable sheet are provided.
When such a paper diaper is actually worn, the absorbent body in the paper diaper is generally curved in a substantially U shape along the wearer's body and extends from the abdomen to the crotch and the buttocks. is there.

At this time, in the absorbent body at the time of wearing, the crotch part, which is a part that mainly receives excretory fluid, is at the lowest position, while the abdomen and buttocks are at a higher position than the crotch part. Therefore, if no measures are taken, when the excretory fluid is discharged to a paper diaper, the excretion fluid is mostly absorbed and retained in the crotch, while the excretory fluid is against gravity and is absorbed in the abdomen and buttocks. Rarely spreads to.
Therefore, only the crotch part is actually utilized for absorption / retention among the absorbent bodies, and the other abdomen and buttocks are not utilized effectively, and the desired absorption / retention for excretory fluid is achieved. The fact is that the amount is not available.

On the other hand, in recent years, due to the increase in CO ₂ gas and global warming, the interest in environmental protection and resource saving has increased. Thinning has been carried out. In addition, weight reduction and thickness reduction are extremely important themes for the wearer because they contribute to an improved feeling of use.
In order to reduce the weight of absorbent articles, it is considered most effective to reduce the amount of absorbent used, but to reduce the amount of absorbent used while maintaining the same level of absorbency. It is necessary to increase the absorption efficiency of the absorber. However, as mentioned above, since it is a part of the whole that is actually used for absorption and retention of excretory fluid in the absorber, it is possible to improve the absorption capacity by utilizing the entire absorber as usefully as possible. It becomes important.

Therefore, as shown in, for example, Patent Documents 1 to 3, the excretory liquid is diffused using a liquid diffusion sheet, and the range in which the excretory liquid is absorbed is expanded as much as possible. What absorbs and retains and improves the absorption capacity is known.
However, in the case of the techniques described in Patent Documents 1 to 3, the ability to diffuse the liquid in the liquid diffusion sheet is weak, and it is difficult to diffuse the excretory liquid to the abdomen and buttocks of the absorber against gravity. there were.
In addition, if the excretory fluid cannot be completely diffused, the excretory fluid is absorbed and held at or near the crotch of the absorber and reaches the retention limit at an early stage. The excretory fluid retained by the diffusion sheet cannot be sufficiently absorbed by the absorber. Then, at the time of discharging the excretion liquid after the second time, the liquid diffusion sheet is already in a state of holding the discharged liquid discharged last time, so that the liquid diffusion sheet recovers the function of absorbing and diffusing the excretion liquid again. It was impossible to diffuse the excretory fluid repeatedly.
Therefore, after all, only a part of the absorbent body is used for absorption / retention of excretion fluid, and the desired absorption / retention amount cannot be obtained, and excretion fluid that could not be absorbed leaks. It was the result.

JP-A-4-89053 JP 2011-240049 A JP 2008-284190 A

  The technical problem of the present invention is that absorption capable of effectively and efficiently utilizing the entire absorbent body and improving the absorption capacity of the excretory liquid while sufficiently ensuring the ability of the liquid diffusion sheet to repeatedly diffuse the excretory liquid. It is to provide a sex article.

  In order to solve the above problems, an absorbent article according to the present invention includes a liquid-permeable sheet, a liquid-impermeable sheet, and a liquid-permeable sheet and a liquid-impermeable sheet disposed between the liquid-permeable sheet and the liquid-impermeable sheet. An absorbent article having a long absorbent body in the direction, which is formed by a nonwoven fabric containing cellulose fibers between the absorbent body and the liquid-impermeable sheet, and extends in the longitudinal direction of the absorbent body The absorbent body contains pulp fibers and a water-absorbing polymer, and the cross section in the thickness direction of the absorbent body is divided into five equal parts in the thickness direction to form five layers. When compared to the volume of the water-absorbing polymer contained in the entire absorbent body, the water-absorbing polymer high-body stack in which the volume ratio of the water-absorbing polymer contained is set to be the highest, Water absorption with low volume fraction of water-absorbing polymer Is composed of a Rimmer low volume layer, in which a first layer positioned on at least the most liquid impervious sheet side, characterized in that a water-absorbing polymer and high volume layer.

In the present invention, only the first layer is configured as a water-absorbing polymer high-body laminate, and the volume of the water-absorbing polymer contained in the first layer is the volume of the water-absorbing polymer contained in the entire absorber. Of 25 to 50%.
In this case, furthermore, the sum of the volume of the water-absorbing polymer contained in the first layer and the second layer adjacent to the first layer is 50 to 80 of the volume of the water-absorbing polymer contained in the entire absorbent body. %.
Or only the said 1st layer is comprised as a water-absorbing polymer high body lamination | stacking, The volume of the water-absorbing polymer contained in this 1st layer is 33- of the volume of the water-absorbing polymer contained in the whole absorber. 50% of the water-absorbing polymer low-layer laminate, and the water-absorbing property contained in each of the third layer that is the center layer of the absorber and the fifth layer that is located closest to the liquid-permeable sheet. The volume of the polymer may be 25 to 33% of the volume of the water-absorbing polymer contained in the entire absorbent body.

Furthermore, in the present invention, the absorber includes the first layer of the five layers when the cross section in the thickness direction of the absorber is divided into five equal parts in the thickness direction, and the center of the absorber. The third layer, which is a layer, and the fifth layer located closest to the liquid-permeable sheet can both be the water-absorbing polymer high-body laminate.
In this case, the volume of the water-absorbing polymer contained in each of the water-absorbing polymer high-body laminates is 25% or more of the volume of the water-absorbing polymer contained in the entire absorber, and each water-absorbing polymer high-body laminate is The total volume of the water-absorbing polymer contained in is preferably 75% to 100% of the volume of the water-absorbing polymer contained in the entire absorbent body.

  In the present invention, the liquid diffusion sheet may be a wet spunlace nonwoven fabric.

Further, in the present invention, the liquid diffusion sheet is provided at a fixed interval on a base portion disposed on the liquid-impermeable sheet side and on the absorber side of the base portion, protrudes toward the absorber side, and extends in the longitudinal direction of the absorber A plurality of eaves portions extending between the adjacent eaves portions and a groove portion formed between the adjacent eaves portions and having a bottom portion formed by the base portion.
In this case, in the liquid diffusion sheet, the base portion has a higher fiber-occupied cross-sectional area ratio than the collar portion, and the surface-side region of the collar portion is formed to have a higher fiber-occupied cross-sectional area ratio than the inner region of the surface-side region. It is preferred that

Furthermore, in the present invention, the liquid diffusion sheet has a liquid absorption height of 130 mm or more after 5 minutes of artificial urine and a water absorption ratio of 2.4 times or more in a water absorption test by the Krem method. can do.
In the present invention, the weight ratio of the water-absorbing polymer contained in the absorber can be 0.5 or more.

According to the present invention, a liquid diffusion sheet extending in the longitudinal direction of the absorbent body, which is formed of a nonwoven fabric containing cellulose fibers, is disposed between the absorbent body and the liquid-impermeable sheet. Capillarity can efficiently diffuse the excretory liquid against gravity.
Moreover, at least the first layer located on the most liquid-impermeable sheet side is set to have the highest volume ratio containing the water-absorbing polymer with respect to the volume of the water-absorbing polymer contained in the entire absorbent body. By using the high polymer laminate, the excretion liquid of the liquid diffusion sheet can be efficiently moved and absorbed with respect to the absorber. As a result, the ability of the liquid diffusion sheet to be repeatedly absorbed and diffused can be maintained for a long period of time, and the excretory fluid absorption capacity of the absorbent article as a whole can be improved.

FIG. 1 is a plan view schematically showing a first embodiment of an absorbent article according to the present invention. 2 is a cross-sectional view taken along the line A-A 'of FIG. FIG. 3 is an enlarged cross-sectional view of the main part of FIG. However, the chassis, the liquid-permeable permeable sheet, and the leak-proof wall are omitted. FIG. 4 is a photograph showing a tomographic image of a cross section in the thickness direction of the absorber according to the present invention. FIG. 5 is an enlarged cross-sectional view of a main part at the same position as FIG. 2 in the second embodiment of the absorbent article according to the present invention. However, the chassis, the liquid-permeable permeable sheet, and the leak-proof wall are omitted. FIG. 6 is an enlarged cross-sectional view of the main part at the same position as FIG. 2 in the third embodiment of the absorbent article according to the present invention. However, the chassis, the liquid-permeable permeable sheet, and the leak-proof wall are omitted. FIG. 7 is an enlarged perspective view of a main part schematically showing a liquid diffusion sheet in the third embodiment of the absorbent article according to the present invention. 8 is a cross-sectional view taken along the line B-B 'of FIG. FIG. 9 is an explanatory view schematically showing a state in which steam jet treatment is performed in manufacturing the liquid diffusion sheet in the third embodiment of the absorbent article according to the present invention. FIG. 10 is a diagram for explaining the principle that the surface side region and the inner region of the heel portion are formed by the steam jet process. FIG. 11 is an enlarged cross-sectional view of a main part at the same position as FIG. 2 in the fourth embodiment of the absorbent article according to the present invention. However, the chassis, the liquid-permeable permeable sheet, and the leak-proof wall are omitted. FIG. 12 is a cross-sectional view schematically showing a liquid diffusion sheet having a configuration different from that of FIGS. 6 to 8. FIG. 13 is a cross-sectional view schematically showing a liquid diffusion sheet having a different configuration from that in FIG.

1 to 4 show a first embodiment of an absorbent article according to the present invention. In the first embodiment, a case where the absorbent article is a disposable paper diaper will be described.
That is, the paper diaper 1 is located on the outermost side when the paper diaper is mounted, covers the wearer's abdomen, crotch part, and groin, and has a chassis 2 that is long in the front-rear direction (vertical direction in FIG. 1), And a flap portion 3 provided integrally on the left and right sides of the chassis 2.
In FIG. 1, the lower side in the figure is the abdomen side of the chassis 2 (ie, the front side of the paper diaper), and the upper side is the heel part side (ie, the rear side of the paper diaper).

In addition, a liquid-permeable sheet 10 and a liquid-impermeable sheet 11 extending in the longitudinal direction of the chassis 2 and a space between the liquid-permeable sheet 10 and the liquid-impermeable sheet 11 are disposed at the center of the chassis 2. A strip-shaped absorber 12 that extends in the longitudinal direction of the chassis 2 is provided.
Furthermore, between the absorber 12 and the liquid-impermeable sheet 11, a liquid diffusion sheet 13 formed of a nonwoven fabric containing cellulose fibers and extending in the longitudinal direction of the absorber 12A is disposed.
Further, between the liquid impervious sheet 11 and the liquid diffusion sheet 13, it becomes obvious when the liquid is wet with excrement liquid, and the fact that the excretion liquid is discharged is passed through the impermeable sheet 11 to the outside of the chassis 2. An indicator 4 is provided for discriminating from the above.

  In addition, the code | symbol 5 in FIGS. 1-3 is a telescopic member for chassiss, such as rubber | gum which respectively expands-contracts the left-right edge part contact | abutted to the wearer's crotch part in the said flap part 3, The code | symbol 6 is at the time of wear This is a leak-proof wall that prevents the excretion fluid such as urine and loose stool from leaking from the left and right sides of the paper diaper 1. Moreover, the code | symbol 7 is the tape 7 for a connection used for the connection of the buttocks side and the abdomen side of the chassis 2 at the time of wear to the wearer of a paper diaper.

The liquid permeable sheet 10 is disposed on the surface of the absorbent body 12 facing the skin surface of the wearer, and abuts against the skin surface of the wearer to quickly absorb the wearer's urine, It is made to transfer to the absorber 12, and is formed by a nonwoven fabric, a woven fabric, a synthetic resin film in which liquid permeation holes are formed, a net-like sheet having a mesh, or the like.
Examples of the nonwoven fabric used for the liquid permeable sheet 10 include natural fibers (for example, wool, cotton, etc.), recycled fibers (for example, rayon, acetate, etc.), synthetic resin fibers (for example, polyethylene, polypropylene, polybutylene, ethylene-vinyl acetate). Polyolefins such as polymers, ethylene-ethyl acrylate copolymers, ethylene-acrylic acid copolymers, ionomer resins; Polyesters such as polyethylene terephthalate, polybutylene terephthalate, polybutylene terephthalate, polylactic acid; Polyamides such as nylon ) And the like.
Non-woven fabrics include core-sheath fibers, side-by-side fibers, island-sea fibers, etc .; hollow fibers, flat fibers, Y-shaped fibers, C-shaped fibers, latent crimps, or actual wrinkles Three-dimensional crimped fibers of shrinkage; split fibers that are split by a physical load such as water flow, heat, embossing, and the like may be mixed.

The liquid impermeable sheet 11 is provided on a surface of the absorber 12 opposite to the surface on which the liquid permeable sheet 10 is disposed. It is attached to the position stationary, prevents permeation of the discharged excrement and prevents it from leaking outside.
As this liquid-impermeable sheet 11, for example, a waterproof nonwoven fabric, a synthetic resin (eg, polyethylene, polypropylene, polyethylene terephthalate, etc.) film, a highly water-resistant meltblown nonwoven fabric sandwiched between strong spunbond nonwoven fabrics, and the like A nonwoven fabric or the like can be used.

The absorbent body 12 absorbs and holds the wearer's urine, includes pulp fibers and a water-absorbing polymer, and has an outer peripheral surface covered with the liquid diffusion sheet 13 and a covering sheet 14.
The absorbent body 12 and the covering sheet 14 are bonded to each other by a hot melt adhesive 16 interposed between the absorbent body 12 and the covering sheet 14.

Furthermore, the absorbent body 12 has a ratio of the weight of the water-absorbing polymer to the total weight of the absorber (the weight of the water-absorbing polymer contained / the total weight of the absorber) of 0.5 or more. It is configured.
As described above, the weight ratio of the water-absorbing polymer to the pulp fiber is set to 0.5 or more, and the use of the water-absorbing polymer that is superior to the pulp fiber in the range that does not affect the absorption capacity of the absorber. This is because the ratio of the pulp fiber is made as large as possible to suppress the use amount of the pulp fiber. Thereby, while reducing the usage-amount of a pulp fiber as much as possible and reducing the weight as the whole absorber, it is trying to maintain the absorbed amount of excretory fluid as much as possible.

  Here, as the pulp fiber used for the absorber in the present invention, for example, wood pulp obtained from coniferous or hardwood as a raw material (for example, groundwood pulp, refiner ground pulp, thermomechanical pulp, chemithermomechanical pulp, etc.) Mechanical pulp; chemical pulp such as kraft pulp, sulfide pulp, alkali pulp; semi-chemical pulp); mercerized pulp or crosslinked pulp obtained by chemically treating wood pulp; bagasse, kenaf, bamboo, hemp, cotton (for example, Non-wood pulp such as cotton linter).

  In addition, examples of the water-absorbing polymer used in the absorbent body in the present invention include starch-based, cellulose-based, and synthetic polymer-based highly water-absorbing materials. Examples of the starch-based or cellulose-based superabsorbent material include starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, and a crosslinked product of sodium carboxymethyl cellulose. Synthetic polymer-based superabsorbent materials include, for example, polyacrylates, polysulfonates, maleic anhydrides, polyacrylamides, polyvinyl alcohols, polyethylene oxides, polyaspartates, polyglutamic acids Examples thereof include superabsorbent polymers (SAP) such as salt-based, polyalginate-based, starch-based, and cellulose-based materials. Among these, polyacrylate-based (particularly sodium polyacrylate-based) high A water absorbent resin is preferred.

  The covering sheet is not particularly limited as long as it has liquid permeability and absorber retention, but from the viewpoint of low cost and absorber retention, tissue formed by a wet method using pulverized pulp as a main material is used. preferable.

On the other hand, the liquid diffusion sheet 13 absorbs excretion fluid that has moved to the liquid-impermeable sheet side of the absorber, and further diffuses it in the longitudinal direction and the width direction. It is substantially the same as the length in the longitudinal direction, and the width in the width direction is slightly smaller than that of the absorbent body 12, and the front and back surfaces are flat.
The liquid diffusion sheet 13 is in contact with the absorbent body 12 through the hot melt adhesive 16 on the surface on the absorbent body side, and is bonded to the absorbent body 12 as described above. It is coated together with the absorber 12. The liquid diffusion sheet 13 and the cover sheet 14 are bonded to each other by a hot melt adhesive 17.

As the liquid diffusion sheet in the present invention, non-woven fabrics containing cellulose fibers, which are hydrophilic fibers, and other beating pulp are used, and wet spunlace nonwoven fabrics are particularly suitable.
In this case, the beaten pulp is preferably fibrillated. In the present invention, “fibrillation” means that a microfiber portion having a submicron size fiber diameter is partially peeled from the surface of the fiber main body portion and extends from the surface of the fiber main body portion. means.

In the present invention, the cellulose fiber contained in the liquid diffusion sheet is not particularly limited, and examples thereof include natural cellulose, regenerated cellulose, and semi-synthetic cellulose.
Examples of the natural cellulose include pulp, for example, wood pulp obtained from coniferous or hardwood (for example, mechanical pulp such as groundwood pulp, refiner ground pulp, thermomechanical pulp, chemithermomechanical pulp; kraft pulp, sulfide pulp, alkali Chemical pulp such as pulp; semi-chemical pulp); mercerized pulp or crosslinked pulp obtained by chemically treating wood pulp; non-wood pulp such as bagasse, kenaf, bamboo, hemp, cotton (for example, cotton linter) Can be mentioned.
Examples of the regenerated cellulose include rayon, for example, viscose rayon obtained from viscose, polynosic and modal, copper ammonia rayon obtained from a copper ammonia salt solution of cellulose (also referred to as “cupra”); organic compound and water Examples thereof include lyocell and tencel obtained by an organic solvent spinning method using an organic solvent which is a mixed solution, and without passing through a cellulose derivative.
Examples of semisynthetic cellulose include acetate fibers such as triacetate and diacetate.

  In addition, when using pulp as these natural celluloses and rayon as regenerated cellulose, the mixing ratio of these pulps and rayon is preferably 10 to 70 parts by mass, and further 15 to 65 parts by mass. It is preferable to do. Moreover, it is preferable to contain the said cellulose fiber and beaten pulp in the ratio of 60-90 mass parts and 10-40 mass parts, More preferably, the ratio (however, 65-75 mass parts and 25-35 mass parts) The total of cellulose fiber and beaten pulp does not exceed 100 parts by mass.).

Moreover, the said liquid diffusion sheet 13 has a density of about 50-280 mg / cm < ³ >, Preferably it has a density of 60-200 mg / cm < ³ >.
By setting the density of the liquid diffusion sheet 13 in this range, it is possible to form a capillary suitable for diffusing excretion fluid absorbed between the fibers in the liquid diffusion sheet. Thereby, it is thought that a liquid diffusion sheet makes a capillary movement of excretion liquid still more effective, and liquid diffusibility improves more.
On the other hand, if the density exceeds 280 mg / cm ³ , the voids in the liquid diffusion sheet become too small and it becomes difficult to form capillaries, resulting in a decrease in liquid diffusibility. On the other hand, when the density is less than 50 mg / cm ³ , the voids in the liquid diffusion sheet increase, but the capillary phenomenon hardly occurs, so that the excretory fluid moves slowly and the liquid diffusibility also decreases.

Furthermore, the liquid diffusion sheet 13 preferably has a liquid absorption height after 5 minutes of artificial urine of 130 mm or more, more preferably 135 mm or more, and further preferably 140 mm or more in a water absorption test by the Krem method. is there. Furthermore, the water absorption ratio is preferably 2.4 times or more, more preferably 2.6 times or more, and further preferably 3.0 times or more.
If the liquid absorption height is too small, the absorber cannot be efficiently wetted. On the other hand, if the water absorption ratio is too small, the liquid cannot be efficiently transferred to the pulp fiber / water absorbent polymer forming the absorption core.
The water absorption test by the Krem method is performed according to JIS P 8141: 2004 "Paper and paperboard-Water absorption test method-Krem method" .

Normally, paper is manufactured through processes such as papermaking (including heat-fusible fibers and binders), drying, and thermocompression bonding as required. Therefore, the paper has a uniform cross-sectional structure. Is increased, the capillary diameter is increased, the suction height is decreased, and the suction amount is increased.
However, when the liquid diffusion sheet is made into a wet spunlace nonwoven fabric, the wet spunlace nonwoven fabric has already taken a sparse / dense structure through papermaking, water jet, and drying processes (the entangled part by hydroentanglement is dense). State). In the subsequent drying step, the bulk of the nonwoven fabric is raised to form a sparse portion depending on the bulk state other than the hydroentangled portion.
Therefore, in the liquid diffusion sheet using the wet spunlace nonwoven fabric, since the sparse / dense structure is already formed, when the density between the sparse entangled parts is reduced, the suction amount increases and the density is increased. It is considered that the entangled portion is supplied with liquid from between the entangled portions, and the suction height is further increased.

By the way, the absorber 12 absorbs when the cross section in the thickness direction of the absorber 12 is divided into five equal parts in the thickness direction and divided into five layers of the first to fifth layers 18-22. The water-absorbing polymer high body laminate 23 in which the volume ratio of the water-absorbing polymer contained is set to the highest with respect to the volume of the water-absorbing polymer contained in the entire body 12, and contained more than the water-absorbing polymer high-body laminate The water-absorbing polymer low-body laminate 24 has a low volume ratio of the water-absorbing polymer.
Of the five layers of the absorbent body 12, only the first layer 18 located closest to the liquid-impermeable sheet side is the water-absorbent polymer high-body laminate 23, while the other four layers are The volume ratio of the water-absorbing polymer contained in the first layer 18 is the water-absorbing polymer low-body laminate 24.

Thus, among the first to fifth layers 18 to 22 of the absorbent body 12, the first layer 18 positioned closest to the liquid-impermeable sheet is the water absorbent polymer high body laminate 23. This is because of the following reason.
That is, by increasing the content of the water-absorbing polymer on the liquid-impermeable sheet side where the liquid diffusion sheet 13 is disposed, the liquid absorption amount on the liquid-permeable sheet side is increased. This is because the amount of liquid absorption on the liquid-impervious isomer sheet side is increased as compared with the earlier, and the ability of the liquid diffusion sheet 13 to diffuse the excretory liquid is recovered early.

More specifically, when diffusing excretory liquid with the liquid diffusion sheet, movement of excretion liquid held by the liquid diffusion sheet to the absorber is performed as efficiently as possible. It is desirable from the viewpoint of recovery of diffusion ability. Then, in the absorbent body, the liquid diffusion sheet is retained by placing more water-absorbing polymers having a higher absorption capacity than pulp fibers on the liquid-impermeable sheet side in contact with the liquid diffusion sheet. It is possible to efficiently and quickly move the excreted liquid that is being discharged toward the absorber.
Thereby, since the excretion liquid which the liquid diffusion sheet hold | maintains reduces early and reliably, the capability to diffuse excretion liquid recovers quickly.
As a result, since it becomes possible to repeat the diffusion of the excretion liquid by the liquid diffusion sheet, it is possible to stably cope with the excretion of a plurality of times, and the diffusion of the excretion liquid is stably performed. In addition, the absorbent capacity of the absorbent article as a whole is further enhanced.

Here, the volume of the water-absorbing polymer contained in the first layer 18 which is the laminated body of the water-absorbing polymer is 25 to 50% (volume ratio) of the volume of the water-absorbing polymer contained in the entire absorber. It is preferable that
When the volume of the water-absorbing polymer contained in the first layer 18 is less than 25% of the volume of the water-absorbing polymer contained in the entire absorbent body, the excretory liquid diffused by the liquid diffusion sheet 13 is Since the opportunity to transfer to the water-absorbing polymer in the one layer 18 is significantly reduced, the excretory fluid cannot be absorbed efficiently. On the contrary, if it exceeds 50%, the ratio of the pulp fibers in the absorbent body becomes too large on the liquid permeable sheet side, and the excretion liquid stays on the liquid permeable sheet side, so that it is difficult to separate water.

Further, in the first embodiment, the second layer 19 adjacent to the first layer 18 belongs to the water-absorbing polymer low-body laminate 24, but other layers excluding the first layer 18, That is, the third layer 20 located at the center of the absorber, the fourth layer 21 adjacent to the liquid permeable sheet side of the third layer 20, and the fifth layer located closest to the liquid permeable sheet side. The volume ratio of the water-absorbing polymer to be contained is higher than the volume of the water-absorbing polymer contained in the entire absorbent body than 22.
Thereby, since the absorption body 12 becomes high in the absorption capability of excretion liquid as it goes to the liquid-impermeable sheet side, movement of excretion liquid from the liquid diffusion sheet 13 is performed more efficiently, and the absorbent article as a whole Absorption capacity is further improved.

Regarding the volume of the water absorbent polymer in the absorbent body 12, the volume of the water absorbent polymer contained in the first layer 18 is 25 to 50% of the volume of the water absorbent polymer contained in the entire absorbent body, and It is preferable that the sum of the volume of the water-absorbing polymer contained in the first layer 18 and the second layer 19 is 50 to 80% of the volume of the water-absorbing polymer contained in the entire absorbent body.
The sum of the volume of the water-absorbing polymer contained in the first layer 18 and the second layer 19 is 50 to 80% of the volume of the water-absorbing polymer contained in the entire absorbent body is less than 50%. Since the excretion liquid diffused by the liquid diffusion sheet 13 is transferred to the water-absorbing polymer in the two layers of the first layer 18 and the second layer 19, the first and second of these are reduced. This is because the absorption capacity expected by the combination of both layers 18 and 19 cannot be ensured, and the excretory fluid may not be absorbed efficiently. On the contrary, when it exceeds 80%, the ratio of the pulp fiber in the absorbent body becomes too large in the third to fifth layers 20 to 23, and the excretory fluid is in these third to fifth layers 20 to 23. This is because the water stays inside, making it difficult to remove water.

Here, with respect to the absorbent body 12, when the cross section in the thickness direction is equally divided into five in the thickness direction, the volume ratio of the water-absorbing polymer of each layer divided into five equal parts is, for example, the following method Measured in
(1) X-ray CT observation and image analysis of the cross section of the absorber Non-destructive observation of the internal structure of the sample is performed using X-ray CT. Then, a three-dimensional image is obtained by analyzing the obtained data.
* When acquiring data, the sample is rotated 360 degrees, the X-ray absorption status data when the sample is rotated once, the same data when the sample is rotated twice, and so on. Get the data.
(2) Stereoscopic observation using analysis software (acquisition of stereoscopic and tomographic images)
A stereoscopic image is created by analysis software from a tomographic image obtained by X-ray CT.
The tomographic image is a two-dimensional image. The stereoscopic image is created by stacking the tomographic images.
(3) Volume measurement occupied by water-absorbing polymer by analysis software From the XY three-dimensional image obtained by X-ray CT, a measurement region is extracted and the volume of the water-absorbing polymer is measured.
From the three-dimensional image, the outermost fibers forming the absorber were tied together to form the absorber formation range.
Draw a rectangle in contact with the outermost part of the absorber, divide the longitudinal direction of the absorber into two and divide the cutting direction of the absorber into five, and measure the volume of the region and the volume of the water-absorbing polymer present in the rectangle. .
The average of a total of 10 points is obtained after X-ray CT observation and image analysis for each layer of the sample (in this case, 5 layers) by the above procedure.
(4) Details of how to determine the water-absorbing polymer volume In order to evaluate in three dimensions, a three-dimensional image is extracted and the volume is calculated.
[Boundary determination]
Specify the target area. (1 section of 5 divisions)
Extract the contrast of the water-absorbing polymer part.
The contrast other than the water-absorbing polymer portion is extracted.
The white part of the water-absorbing polymer part, and the other black and gray parts are binarized (white and black) to leave only the water-absorbing polymer part.
[Volume calculation]
After the software analyzes the pixels (pixels) of the water-absorbing polymer portion, it is converted into a voxel and three-dimensionalized, and converted to mm ³ as a unit, thereby calculating the volume from each pixel and voxel.
[Volume ratio calculation]
The volume ratio is calculated from the volume of the target region calculated by software and the total volume of the five cross sections using the following calculation formula (1).
(Volume ratio r) (%) = (volume of the target area) / (total volume of five cross sections existing in the rectangle of the target area) × 100 (1)
(5) Measurement conditions In addition, as a measurement condition in X-ray CT, the following can be used, for example.
Tube voltage: 40 kV
Tube current: 20 μA
Number of pixels: 1024 x 1024 pixels
Field size: 10.1mmφ × 10.1mmh
(6) Device Used As a device used for measuring the volume ratio of the water-absorbing polymer of the absorber, for example, the following can be used.
Three-dimensional measurement X-ray CT system: TDM1000-IS / SP (manufactured by Yamato Kagaku)
Three-dimensional volume rendering software: VG-Studio MAX (NVS).

In the case of what is shown in FIG. 4, the volume of the water-absorbing polymer contained in the first layer, which is a superabsorbent polymer body stack, is 35% with respect to the volume of the water-absorbing polymer contained in the entire absorbent body. This layer is 34%. The third layer was 18%, the fourth layer was 6%, and the fifth layer was 7%.
From FIG. 4, it can be seen that the volume ratio of the water-absorbing polymer increases toward the liquid-impermeable sheet side, that is, the first layer side. In addition, the sum of the volume of the water-absorbing polymer contained in the first layer and the second layer reaches 69% of the volume of the water-absorbing polymer contained in the entire absorbent body, and the liquid impermeability of the absorbent body. It can be seen that the absorbent capacity on the side of the conductive sheet is much higher than that on the side of the liquid-permeable sheet.

In addition, about formation of the absorber from which the volume of the water absorbing polymer to contain differs for every 1st-5th each layer as mentioned above, it is possible to form by arbitrary methods.
For example, a general absorber manufacturing apparatus having a function of mixing a water-absorbing polymer when an absorbent material such as pulp fiber is laminated in a predetermined shape (for example, absorption described in JP 2010-119655 A) Body manufacturing apparatus). And when the pulp fiber which comprises an absorber is laminated | stacked in the type | mold formed in the outer peripheral surface of the suction drum, so that a predetermined amount of water absorbing polymer may be supplied with respect to each of the first to fifth layers. By changing the supply position of the water-absorbing polymer to adjust the supply time of the water-absorbing polymer, or by changing the supply amount or supply timing of the absorbent polymer, the absorbent body having the above-described configuration is formed. Can do.

The movement of the excretory fluid when the absorbent article having the above configuration is worn will be described.
First, when excretion fluid is discharged from the wearer, the excretion fluid passes through the liquid-permeable sheet 10 and moves to the absorber 12.
The excretory fluid that has moved to the absorbent body 12 is diffused along the cover sheet 14, while moving to the absorbent body 12 through the cover sheet 14. The excretory fluid that has moved to the absorbent body 12 moves along the surface of the absorbent body 12, but also moves to the interfiber spaces of the pulp fibers of the absorbent body 12, and absorption by the water-absorbing polymer is started. The At this time, most of the excretory fluid is absorbed in the crotch portion of the absorber 12 or in the vicinity thereof.
When the excretory fluid is absorbed by the water-absorbing polymer, the water-absorbing polymer swells and the density of the absorber 12 in that portion decreases, so that the excreted fluid passes through the absorber 12 without being absorbed, and the absorption. The excreted liquid that has not been reached reaches the liquid diffusion sheet 13.

  Exhaust fluid that has reached the liquid diffusion sheet 13 moves through the interface between the absorber 12 and the liquid diffusion sheet 13 and is absorbed by the liquid diffusion sheet 13. Then, the excretory liquid absorbed by the liquid diffusion sheet 13 starts to move through the liquid diffusion sheet 13 by capillary action, and the longitudinal direction that is the abdomen side and the buttock side of the liquid diffusion sheet 13 irrespective of gravity, that is, the paper diaper 1 Gradually move and diffuse to the buttocks and abdomen.

At this time, since the excretion fluid from the wearer is not directly excreted on the abdomen side and the buttock side of the absorbent body 12, there is still room for the amount of excretion fluid absorbed. The impervious sheet side is hardly used to absorb excretory fluid at this point. Therefore, the excretory liquid diffused in the longitudinal direction of the liquid diffusion sheet 13 is absorbed by the absorbent body 12 on the abdomen side and the buttock side.
Thereby, excretory fluid can be efficiently absorbed by effectively utilizing the abdomen side and the buttocks side of the absorbent body 12 that has hardly been used conventionally.

On the other hand, the liquid diffusion sheet 13 in which the excretory liquid is absorbed on the abdomen side or the buttock side of the absorbent body 12 is restored to the ability to absorb and retain and diffuse the excretion liquid again, as long as the excretion liquid retained is lost. Therefore, the excretory fluid retained by the crotch portion is continuously diffused and sequentially absorbed on the abdomen side and buttocks side of the absorbent body 12.
Therefore, as long as the diffused excretion liquid is absorbed from the abdomen side or the buttock side of the absorber 12, the liquid diffusion sheet 13 continues to recover the liquid diffusion capability, and thus the excretion liquid can be diffused repeatedly.
As a result, even if the wearer discharges the excretion liquid a plurality of times, the liquid diffusion sheet 13 whose liquid diffusion capacity has been restored stably diffuses the excretion liquid each time, so that the excretion liquid is reliably transferred to the absorber 12. It can be absorbed and retained.

Thus, according to the absorbent article of the present invention, the liquid diffusion sheet 13 extending in the longitudinal direction of the absorbent body 12 has repeatedly been diffused in the longitudinal direction of the absorbent body 12 and thus has not been effectively utilized. Moreover, the absorption capacity can be remarkably improved by effectively utilizing the entire absorbent body including the abdomen side and the buttocks side of the absorbent body 12.
In addition, the volume ratio of the water-absorbing polymer containing the first layer 18 located on the most liquid-impermeable sheet side to the volume of the water-absorbing polymer contained in the entire absorbent body is set to be the highest. By using the superabsorbent polymer high-body laminate 23, the excretory liquid retained by the liquid diffusion sheet 13 can be efficiently moved and absorbed by the absorbent body 12. As a result, the ability of the liquid diffusion sheet 13 to absorb and diffuse the discharged liquid repeatedly can be maintained for a long period of time, and the excretory liquid absorbing capacity of the absorbent article as a whole can be improved.

FIG. 5 shows a second embodiment of the absorbent article of the present invention, and the absorbent article of the second embodiment is different from the first embodiment in the configuration of the absorbent body. ing.
That is, when the absorber 31 in the second embodiment is divided into the first to fifth layers 32 to 36 by dividing the cross section of the absorber 31 in the thickness direction into five equal parts in the thickness direction. Of these first to fifth layers 32 to 36, the first layer 32 that is located closest to the liquid-impermeable sheet, the third layer 34 that is the central layer of the absorber, and the most liquid The fifth layer 36 located on the side of the permeable sheet is the water-absorbing polymer high-body laminate 37.

  The first, third, and fifth layers 32, 34, and 36, which are the water-absorbing polymer high-layer laminate 37, all contain water absorbency with respect to the volume of the water-absorbing polymer contained in the entire absorber. The volume ratio of the polymer is the highest among the five layers, and the basis weights are the same as each other. On the other hand, each of the second and fourth layers 33 and 35 is a water-absorbing polymer low-body laminate 38 in which the volume ratio of the water-absorbing polymer contained is lower than that of the water-absorbing polymer high-body laminate 37. It has the same basis weight.

As described above, the three layers of the first layer 32, the third layer 34, and the fifth layer 36 in the case where the absorber is divided into five layers are formed as the water-absorbing polymer high body laminate 37. This is because the entire body is effectively utilized for absorption of excretory fluid.
As for the first layer 32, as described in the first embodiment, the liquid-impermeable sheet side of the absorbent body 31 that is in contact with the liquid diffusion sheet 13 is placed on the water-absorbing polymer high body laminate 37. This is because the excretory liquid retained by the liquid diffusion sheet 13 is efficiently and stably moved toward the absorber 31. Thereby, since the excretion liquid which the liquid diffusion sheet 13 hold | maintains reduces early and reliably, the capability to diffuse excretion liquid recovers early, and can respond also to excretion of multiple times stably. .

Thus, in addition to the first layer 32, the third layer 34 and the fifth layer 36 are made of water-absorbing polymer high-body laminates by dispersing a plurality of water-absorbing polymer high-body laminates. This is because, when moistened with excretory fluid, blocking of the water-absorbing polymers due to expansion of the water-absorbing polymer is suppressed as much as possible, and inhibition of excretion fluid absorption due to the blocking is suppressed.
Furthermore, when the water-absorbing polymer expands, the entire absorber is deformed, and in some cases, the absorber is partially separated, and the absorption capacity of the absorber may be reduced. This is also to prevent the excretory fluid from being absorbed and retained only in the first layer. Thereby, the amount of deformation of the absorber as a whole is made as small as possible to suppress a partial detachment of the absorber, and a decrease in the absorption capacity of the absorber is suppressed.
The reason why the fifth layer 36 is made of a water-absorbing polymer high-body layer is to absorb the moisture remaining on the covering sheet, thereby reducing rewetting.
On the other hand, in addition to the first layer 32, the third layer 34 and the fifth layer 36 are water-absorbing polymer high-body laminates, whereby the second layer 33, which is a water-absorbing polymer low-body laminate, Since there are more pulp fibers in the fourth layer 35 than in the first, third, and fifth layers 32, 34, and 36, it is possible to improve the diffusibility of excretory fluid in the absorber. The effect of becoming is obtained.

Here, the volume of the water-absorbing polymer contained in the first layer 32, the third layer 34, and the fifth layer 36 that are the water-absorbing polymer high-body laminate 37 is included in the entire absorber 31. The total volume of the water-absorbing polymer that is 25% or more of the volume of the water-absorbing polymer and is contained in each of these water-absorbing polymer high body laminates, that is, the first layer 32, the third layer 34, and the fifth layer. The total volume of the water-absorbing polymer contained in 36 is preferably 75% to 100% of the volume of the water-absorbing polymer contained in the entire absorbent body.
In particular, the volume ratio of the water-absorbing polymer contained in each of the first layer 32, the third layer 34, and the fifth layer 36 is contained in the entire absorbent body and is less than 25% of the volume of the water-absorbing polymer. The chance of excretory fluid transfer to the water-absorbing polymer of these first layer 32, third layer 34, and fifth layer 36 is significantly reduced. As a result, it may be difficult to obtain the function of absorbing and retaining the excretory fluid expected as a super absorbent polymer laminate, and as a result, it may not be possible to ensure the necessary absorption performance as a whole There is.
At this time, the second and fourth layers 33 and 35 which are the laminated body of the low water-absorbing polymer may contain little or no water-absorbing polymer.

The volume ratio of the water-absorbing polymer of each of the layers 32 to 36 divided into five equal parts can be measured by the same method as in the first embodiment.
The absorber 31 can be formed by a method similar to the forming method described in the first embodiment.

  In the second embodiment, the structure of the absorbent body 31, particularly the water absorbent polymer contained in the first to fifth layers 32 to 36 with respect to the volume of the water absorbent polymer contained in the entire absorbent body. Except for the configuration related to the volume ratio, the configuration is basically the same as that of the first embodiment described above, and the same reference numerals are given to omit the detailed description in order to achieve the same effect.

The absorbent article of 2nd Embodiment which has the said structure can acquire the effect equivalent to the above-mentioned 1st Embodiment fundamentally.
In addition to this, the three layers of the first layer 32, the third layer 34, and the fifth layer 36 are formed as a water-absorbing polymer high-body laminate 37 containing a large amount of water-absorbing polymer, so that , Suppresses the inhibition of excretion absorption due to blocking of the water-absorbing polymers due to the expansion of the water-absorbing polymer, suppresses the deterioration of the absorption function due to deformation of the entire absorbent body due to the expansion of the water-absorbing polymer, liquid permeability Further effects such as reduction of sheet rewet can be obtained.
Moreover, since the second and fourth layers 33 and 35 are the water-absorbing polymer low body laminate 38 mainly composed of pulp fibers, it is possible to stably ensure liquid diffusibility in the absorbent body. There is.

FIGS. 6-10 shows 3rd Embodiment of the absorbent article of this invention, This 3rd Embodiment is a liquid diffusion sheet with the said 1st and 2nd Embodiment. The configuration is different.
That is, the liquid diffusion sheet 41 in the third embodiment is provided on the absorber-side surface of the band-like base portion 42 disposed on the liquid-impermeable sheet side and on the absorber-side surface of the base portion 42. And a plurality of flanges 43 extending in the longitudinal direction of the absorber are integrally formed, and the length in the longitudinal direction is substantially the same as the length in the longitudinal direction of the absorber. Further, a groove 44 having a bottom 44 a substantially formed by the base 42 is provided between the adjacent flanges 43.
In the third embodiment, the absorber having the same configuration as that of the absorber 12 of the first embodiment is used.

  The liquid diffusion sheet 41 is bonded to the absorber 12 with the flange 43, more specifically, the tip side of the flange 43 in contact with the absorber 12 via the hot melt adhesive 16. ing. Further, the liquid-impermeable sheet side of the base portion 42 of the liquid diffusion sheet 41, that is, the surface opposite to the surface where the flange portion 43 is provided in the base portion 42 is applied to the covering sheet 14 by the hot melt adhesive 17. It is glued.

  The liquid diffusion sheet 41 is formed such that the fiber-occupied cross-sectional area ratio of the base portion 42 is higher than that of the flange portion 43. Further, the surface side region 43a corresponding to the surface layer portion of the flange portion 43 is an inner region 43b located inside the surface side region 43a, that is, the flange portion 43 surrounded by the surface side region 43a and the base portion 42. The fiber-occupied cross-sectional area ratio is higher than that of the inner layer region.

Here, in the present invention, the fiber-occupied cross-sectional area ratio is a measurement of the area occupied by the fiber in the measurement region in a tomographic image obtained by X-ray CT of the nonwoven fabric. The ratio to the area of the region.
In the liquid diffusion sheet 41, the portion where the fiber occupation cross-sectional ratio is high is basically high in density, and therefore the excretion fluid easily moves due to capillary action in the portion where the fiber occupation cross-sectional ratio is high. It is thought that excretory fluid can be moved regardless of gravity. On the other hand, it is considered that the portion where the fiber occupation cross-sectional ratio is low is basically low in density and hardly causes capillary action, but has a high ability to retain excretory fluid and functions as a conduit.
Therefore, the liquid diffusion sheet 41 can surely move and diffuse the excretory liquid in the length direction, so that an excellent liquid absorption height can be obtained, while a sufficient amount of suction is secured. can do.

Further, in the liquid diffusion sheet 41, the excretion liquid is diffused particularly rapidly against the gravity at the base portion 42 having a high fiber occupation cross-sectional area ratio. Furthermore, since this liquid diffusion sheet 41 has an interface generated due to a difference in density, that is, a region where two density differences are continuous, it is considered that capillary action is promoted at the interface.
Therefore, in this liquid diffusion sheet 41, from the inner region 43b (sparse) of the flange portion 43 having a low fiber occupied cross-sectional area ratio, the base portion 42 (dense) or the flange portion having a higher fiber occupied cross-sectional area ratio than the inner region 43b. It is considered that the excretory fluid is transferred to the surface side region 43a (dense) of 43 more efficiently, and that the excretory fluid can be diffused more effectively and quickly against gravity.

About the fiber occupation cross-sectional area ratio of each part of the base part 42 of the said liquid diffusion sheet 41, the surface side area | region 43a of the collar part 43, and the inner side area | region 43b, what is necessary is just to satisfy the height relationship mentioned above, and the fiber occupation cross-section ratio of The absolute value is not particularly limited.
However, when the average fiber occupation cross-sectional ratio of the entire cross section in the width direction (short direction) of the liquid diffusion sheet 41 is r _O , the fiber occupation cross-sectional area ratio r ₁ of the base portion 42 is preferably 1.2 r _O or more. , fibers occupied cross-sectional area ratio r ₂ of the surface area 43a of the ridge portion 43 is 0.8 r _O or more and less than 1.2R _O, fibers occupied cross-sectional area ratio r ₃ of the inner region 43b of the ridges 43 is 0. it is less than 8r _O. More preferably, the fibers occupied cross-sectional area ratio r ₁ of the base portion 42 is 1.2R _O or more and less than 2.0R _O, fibers occupied cross-sectional area ratio r ₂ of the surface area 43a of the ridge portion 43 is 0.8 R _O or more and less than 1.2R _O, fibers occupied cross-sectional area ratio r ₃ of the inner region 43b of the ridge portion 43 is 0.1 r _O or more and less than 0.8 r _O.

The fiber occupation cross-sectional area ratio is measured, for example, as follows.
(1) X-ray CT observation and image analysis of non-woven fabric cross section Non-destructive observation of the internal structure of the sample is performed using X-ray CT. Then, a tomographic image is obtained by analyzing the obtained data.
* Rotate the sample 360 degrees. At that time, the X-ray absorption status data when rotated once, the same data when the sample is rotated twice, and so on are acquired.
(2) Stereo observation with analysis software
A three-dimensional image is created from the tomogram obtained by X-ray CT using analysis software, and the internal situation (XY tomogram) is confirmed on an arbitrary XY section.
* A tomogram is a two-dimensional image, and a three-dimensional image is created by stacking tomograms.
(3) Fiber area measurement by analysis software A measurement area is extracted from an XY tomogram obtained by X-ray CT, and the fiber area is measured.
From the three-dimensional image and the XY tomographic image, the fibers constituting the XY tomographic image to be measured are connected to the outermost fibers present mainly in the part forming the buttock, thereby forming the ridge forming range.
Draw a rectangle that touches the outermost part of the buttock, divide into 3 parts in length, 5 parts in width, measure the cross-sectional area of the region, the cross-sectional area of the heel part in the rectangle, and the cross-sectional area of the fiber, The fiber occupation cross-sectional area ratio for each part is calculated.
The cross section is extracted as much as possible where there are no irregular parts, and the average is obtained after 10 points are measured.
(4) Details of how to obtain fiber cross-sectional area To perform two-dimensional evaluation, a tomographic image is extracted and the area is calculated. At this time, since the three-dimensional volume rendering software can be evaluated in two dimensions, it is used.
[Boundary determination]
Specify the target area. (1 section of 15 divisions, etc.)
Extract the contrast of the fiber part.
Extract contrast other than fiber.
The white, black, and gray parts are binarized (white and black) to create an interface.
[Area calculation]
After software analyzes the pixel of the heel part (pixel) and the pixel of the fiber part inside the rectangle that touches the buttock, the pixel is converted to μm ² as a unit, and the area is calculated from each pixel. .
[Area ratio calculation]
The cross-sectional area ratio is calculated from the area of the region calculated by the software and the fiber cross-sectional area using the following calculation formula (1).
(Fiber occupation cross-sectional area ratio r) (%) = (Fiber cross-sectional area of the target region) / (Cross-sectional area of the buttocks existing in the rectangle of the target region) × 100 (1)
(5) Measurement conditions In addition, as a measurement condition in X-ray CT, the following can be used, for example.
Tube voltage: 40 kV
Tube current: 15 μA
Number of pixels: 512 x 512 pixels
Field size: 2.5mmφ × 2.5mmh
(6) Used device As a used device for measuring the fiber occupation cross-sectional area ratio, for example, the following device can be used.
Three-dimensional measurement X-ray CT system: TDM1000-IS / SP (manufactured by Yamato Kagaku)
Three-dimensional volume rendering software: VG-Studio MAX (NVS).

An example of a method for producing the liquid diffusion sheet 41 will be briefly described. First, a fiber web is formed on a conveyor surface by a wet method using cellulose fibers as a main raw material, and then subjected to a water jet treatment to obtain a wet span. Make a lace nonwoven fabric.
Next, a steam jet process is performed from the conveyor surface side during the water jet process of the wet spunlace nonwoven fabric.

  At this time, as shown in FIGS. 9 and 10, the fibers of the wet spunlace nonwoven fabric 52 on the suction drum 53 are scraped at regular intervals by the fluid jet from the steam jet nozzle 50 to the original wet span. Protrusions having a density lower than that of the lace nonwoven fabric 52 are formed. When the steam jet 51 strikes strongly, the fiber push-up amount increases, and the protrusion 52a formed by the fiber push-up is warped, and the tip of the protrusion 52a is far from the original position on the wet spunlace nonwoven fabric 52. Land on. Thereby, the low density surrounded by the high density part A which is the original wet spunlace nonwoven fabric 52, the medium density part B composed of the fibers of the raised protrusions, and the high density part A and the medium density part B A density portion C is formed.

As a result, on the high-density portion that is the original wet spunlace nonwoven fabric, that is, the base portion 42, the groove portion 44 having the bottom portion 44a adjacent to the high-density portion (that is, the base portion 42) remaining after the fibers are pushed up by the steam jet is adjacent. Between the groove portion 44, one or two flange portions 43 are formed in which the tips of the warped protrusions 52a and 52a are brought to face each other. At this time, as for the collar part 43, the said medium density part becomes the surface side area | region 43a, and the said low density part becomes the inner side area | region 43b.
Moreover, the pattern of the collar part 43 can be changed with the pressure of a nozzle pattern, a conveyor mesh pattern, or a steam jet.

  In the third embodiment, except for the configuration of the liquid diffusion sheet 41, the configuration is basically the same as that of the first embodiment described above, and the same reference numerals are used to achieve the same effect. Detailed description will be omitted.

  When the absorbent article having the above-described configuration is used, when the excretory fluid discharged from the wearer reaches the liquid diffusion sheet 41, the excretion fluid is absorbed by the absorbent body 12 and the liquid diffusion sheet 41, particularly, the surface side of the collar portion 43. While moving on the interface with the region 43a, it is absorbed by the inner region 43b through the surface side region 43a of the flange 43. Further, the excretory fluid absorbed in the inner region 43b is further moved to the base portion 42 and absorbed. The excretory fluid absorbed by the base portion 42 starts to move through the base portion 42 by capillary action, and moves and diffuses in the longitudinal direction of the liquid diffusion sheet 41, that is, the buttocks side and the abdomen side of the paper diaper 1 regardless of gravity. And it will be absorbed by the buttocks side and the abdomen side of the absorber 12.

Therefore, according to the absorbent article of this 3rd Embodiment, the effect similar to the said 1st Embodiment can be acquired fundamentally.
However, compared with the case of the first embodiment, the liquid diffusion sheet 41 has a configuration capable of diffusing the excretory liquid more effectively and rapidly, and the excretion liquid by the liquid diffusion sheet 41 can be diffused. Diffusion can be performed more efficiently and the liquid diffusing ability of the liquid diffusing sheet 41 is recovered early, so that there is an advantage that the absorption function of the absorbent article can be further improved.

FIG. 11 shows a fourth embodiment of the absorbent article of the present invention, and the absorbent article of the fourth embodiment includes the first embodiment and a water-absorbing polymer in the absorbent body. The structure of the low layer stack is different.
That is, when the absorber 61 in the fourth embodiment is divided into first to fifth layers 62 to 66 by dividing the cross section of the absorber 61 in the thickness direction into five equal parts in the thickness direction. Of these first to fifth layers 62 to 66, only the first layer 62 located closest to the liquid-impermeable sheet side is used as the water-absorbing polymer high-body laminate 67, while the other second to second layers 62 to 66 are used. The fifth layers 63 to 66 are the water-absorbing polymer low body laminate 68.
And among the 2nd-5th layers 63-66 which are the said water-absorbing-polymer low body lamination | stacking 68, it is located in the 3rd layer 64 which is the center layer of the absorber 61, and the most liquid permeable sheet side. With respect to the fifth layer 66, the volume ratio of the water-absorbing polymer to the volume of the water-absorbing polymer contained in the entire absorbent body is set to the other water-absorbing polymer low body laminate, that is, the second layer. 63 and the volume ratio of the water-absorbing polymer contained in the fourth layer 65, respectively.

Thus, the volume ratio of the water-absorbing polymer contained in the third layer 64 and the fifth layer 66 out of the second to fifth layers 63 to 66 which are the absorber polymer low-body laminates, The reason why the height is higher than that of the second and fourth layers 63 and 65 is that the third and fifth layers 64 and 66 have a function of the superabsorbent polymer stack in addition to the function of the superabsorbent polymer stack. This is to bring out the close function.
That is, since there are more pulp fibers than the first layer, which is a superabsorbent polymer superstructure laminate, while ensuring the diffusibility of excretory fluid in the absorber, the volume ratio of the superabsorbent polymer contained is relatively Since it is high, a certain amount of excretory fluid can be absorbed and retained.
In addition, by dispersing a plurality of layers having a relatively high volume ratio of the water-absorbing polymer to the volume of the water-absorbing polymer contained in the entire absorbent body, the water-absorbing polymer expands when wet with excretory fluid. It has the function to suppress blocking of the water-absorbing polymers associated with as much as possible, and to suppress the inhibition of excretion absorption due to the blocking. Here, the third layer and the fifth layer have a lower volume ratio of the water-absorbing polymer to be contained than the first layer which is a water-absorbing polymer high-body laminate. Is less likely to occur and the diffusibility of excretory fluids is less likely to be impaired.

Furthermore, as described above, when the water-absorbing polymer expands, the absorbent body as a whole is deformed, and in some cases, the absorbent body may be partially separated, which may cause a decrease in the absorption capacity of the absorbent body. Even in the case of the water-absorbing polymer low-body laminate as in the third and fifth layers, the amount of deformation can be reduced as a whole by dispersing and arranging the layer having a relatively high volume ratio of the water-absorbing polymer to be contained. There is also a function of reducing the absorption capacity of the absorber by reducing it as small as possible to suppress partial detachment of the absorber.
Moreover, since the volume ratio of the water-absorbing polymer to be contained is relatively high, the fifth layer can absorb water remaining in the covering sheet to some extent, so that the re-wetting can be performed. Can be reduced.

Here, the volume of the water-absorbing polymer of the first layer 62 that is the water-absorbing polymer high-body laminate 67 is preferably 33 to 50% of the volume of the water-absorbing polymer contained in the entire absorber 61.
In addition, the volume of the water-absorbing polymer of the third layer 64 and the fifth layer 66 that are the water-absorbing polymer low layer laminate 68 is 25 to 33% of the volume of the water-absorbing polymer contained in the entire absorber. It is preferable to do. However, the volume ratio of the water-absorbing polymer contained in the water-absorbing polymer lower layer stack 68 is lower than the volume ratio of the water-absorbing polymer high-layer stack 67, and the total volume of the water-absorbing polymer contained in each layer is absorbed. It is contained in the whole body and does not exceed 100% of the volume of the water-absorbing polymer.
The third layer 64 and the fifth layer 66 do not have to have the same volume ratio of the water-absorbing polymer contained therein, and can be arbitrarily set within the range of 25 to 33. In addition, the other layers that are the water-absorbing polymer low-body laminate 68, that is, the second and fourth layers 63 and 65 may contain little or no water-absorbing polymer.

Thus, the volume ratio of the water-absorbing polymer of the first layer 62, which is the absorber polymer of the water-absorbing polymer high body laminate 67, is 33 to 50%, and the volume of the water-absorbing polymer of the third and layers 64 and 66 is The reason why the ratio is set to 25 to 33% is as follows.
That is, when the volume ratio of the water-absorbing polymer of the third and fifth layers 64 and 66 exceeds the volume ratio of the water-absorbing polymer of the first layer 62, the water-absorbing polymer of the first layer 62 from the liquid diffusion sheet 13. This is because the chance of liquid transfer to the water is reduced. Further, the third layer 64 and the fifth layer 66 are likely to be blocked due to the expansion of the water-absorbing polymer, and the diffusibility of excretory liquid is also reduced, so that the absorption performance of the entire absorbent body may be impaired. It is because there is sex.

In addition, when the volume ratio of the water-absorbing polymer contained in the first layer 62 is less than 33% of the volume of the water-absorbing polymer contained in the entire absorbent body 61, In addition to less chance of excretory fluid transfer, the superiority of the absorption capacity with respect to the third and fifth layers 64 and 66 is reduced, and the absorption and retention function of the excretory fluid as a whole of the absorber 61 and diffusibility The balance may be lost. As a result, it becomes difficult to obtain a function of absorbing and holding excretory liquid expected as a superabsorbent polymer high-layer laminate, and as a result, the absorbent body 61 as a whole may not be able to ensure the necessary absorption performance.
Conversely, if it exceeds 50%, the ratio of the pulp fibers in the absorbent body 61 becomes too large in each layer of the water-absorbent polymer low-layer laminate 68, and the excreta remains concentrated in the first layer 62. There is a possibility that it will be difficult to separate water.

Furthermore, when the volume ratio of the water-absorbing polymer contained in the third and fifth layers is less than 25% of the volume of the water-absorbing polymer contained in the entire absorbent body 61, each of the third and fifth layers The chance of excretion transfer to the water-absorbing polymer is reduced, and the superiority of the absorption capacity in the third and fifth layers 64 and 66 may be reduced with respect to other water-absorbing polymer low-layer laminates. And the function of absorbing and retaining excretory fluids in accordance with the expected superabsorbent super absorbent laminate cannot be exhibited.
On the other hand, if it exceeds 33%, it may have a water absorption capacity equivalent to or higher than that of the superabsorbent polymer body, so that the balance between the absorption and retention function of the excretory fluid in the absorber 61 and the diffusibility is lost. On the other hand, there is a possibility that the necessary absorption performance cannot be secured for the entire absorber 61.

The volume ratio of the water-absorbing polymer of each of the layers 62 to 66 divided into five equal parts can be measured by the same method as in the first embodiment.
The absorber 61 can be formed by a method similar to the forming method described in the first embodiment.

  In the second embodiment, except for the configuration of the absorber 61, particularly the configuration related to the volume ratio containing the water-absorbing polymer with respect to the volume of the entire absorber of the first to fifth layers 62 to 66, The configuration is basically the same as that of the first embodiment described above, and the same reference numerals are given to omit the detailed description in order to achieve the same effect.

The absorbent article of 2nd Embodiment which has the said structure can acquire the effect equivalent to the above-mentioned 1st Embodiment fundamentally.
In addition, for the third and fifth layers 63 and 65, the volume ratio of the water-absorbing polymer contained is higher than that of the second and fourth layers 64 and 66, although the water-absorbing polymer low-layer laminate. And while providing the water absorption and retention performance according to the 1st layer 62 which is a water absorbing polymer high body lamination | stacking, the liquid diffusibility which makes pulp fiber a main component is also ensured to some extent. Therefore, inhibition of excretion absorption due to blocking of the water-absorbing polymers due to expansion of the water-absorbing polymer is suppressed, reduction of the absorption function due to deformation of the entire absorbent body due to expansion of the water-absorbing polymer, liquid permeation The effect of reducing the rewet of the adhesive sheet can be expected to some extent. On the other hand, since the liquid diffusibility can be sufficiently ensured, the absorbent body 61 as a whole can have both the performance of absorption, retention ability and liquid diffusibility.

In the first and third embodiments, the volume ratio of the water-absorbing polymer contained in the second layer 19 adjacent to the first layer 18 is changed to a layer that is another water-absorbing polymer low-body laminate 24. The volume of the water-absorbing polymer contained in the first layer 18 and the second layer 19 is set to 50 to 80% of the volume of the water-absorbing polymer contained in the entire absorbent body.
However, in the present invention, if at least the first layer located closest to the liquid-impermeable sheet is a water-absorbing polymer high-body laminate, the volume ratio of the water-absorbing polymer contained in the second layer is not necessarily changed. It is not necessary to make it higher than the layers, and the volume ratio of the water-absorbing polymer contained in each of the second to fifth layers can be arbitrarily set. Further, the sum of the volume of the water-absorbing polymer contained in the first layer and the second layer is not necessarily 50 to 80% of the volume of the water-absorbing polymer contained in the entire absorbent body.

  In the second embodiment, the first layer 32, the third layer 34, and the fifth layer 36 of the absorber 31 are formed as the water-absorbing polymer high-body laminate 37. However, in the present invention, the absorption is performed. The body is composed of a superabsorbent polymer stack and a superabsorbent polymer stack, and at least the first layer may be a superabsorbent polymer stack, and the third layer and the fifth layer are not necessarily required. May not be a water-absorbing polymer high body laminate. Alternatively, in addition to the first layer, one to three of the second to fifth layers are formed as a water-absorbing polymer high body laminate, and the absorbent body has a configuration other than the absorbent body as in the second embodiment. May be adopted.

  In the third embodiment, the absorber 12 having the same configuration as that of the first embodiment is used. However, in the present invention, as the absorber, the absorber 31 of the second embodiment, Or you may use the thing of the same structure as the absorber 61 of 4th Embodiment.

In the third embodiment, as the liquid diffusion sheet 41, as shown in FIG. 7 and FIG. 8, each flange 43 has substantially the same width. As shown in FIG. 12, a configuration in which the widths of the flange portions 43 are different from each other can be used.
Or the thing of the structure that the space | interval between each collar part is irregular can be used.

Furthermore, in the present invention, as the liquid diffusion sheet 41, as shown in FIG. 13, a depression extending in the longitudinal direction of the liquid diffusion sheet 41 at the approximate center of the flange 43 and not reaching the base at the end surface on the absorber side. What formed the center area | region 43c in which 45 was formed can be used.
The central region 43c is formed in the manufacturing process of the liquid diffusion sheet, and when forming the collar portion by the steam jet, the pressure from the steam jet is larger than that at the time of forming the collar portion shown in FIG. Formed. That is, when the pressure of the steam jet increases, the separated fibers are blown farther, and the protrusion pushed up by the steam jet becomes longer. Then, at the position where the tips of the warped projections land, the tips of adjacent projections collide with each other, and the colliding portion becomes the central region. The depression in the central region is formed because adjacent protrusions having a curved shape collide with each other.

As described above, when the liquid diffusion sheet 41 includes the central region 43c of the flange portion 43, the fiber occupation cross-sectional ratio is lower than the surface side region 43a of the flange portion 43, but higher than the inner region 43b. .
Specifically, the fibers occupied cross-sectional area ratio r ₁ of the base portion 42 at this time is 1.2R _O or more, the fiber occupied cross-sectional area ratio r ₂ of the surface area 43a of the ridge portion 43 is 0.8 R _O above, 1.2R less than _O, the center region 43c fibers occupied cross-sectional area ratio r ₄ of the ridges 43 is 0.5r _O or more and less than 0.8 r _O, the inner region 43b fiber occupied cross-sectional area ratio r ₃ of the ridges 43 Is preferably less than 0.5 r 2 _O. More preferably, the fibers occupied cross-sectional area ratio r ₁ of the base portion 42 is 1.2R _O to less than 2.0R _O, fibers occupied cross-sectional area ratio r ₂ of the surface area 43a of the ridge portion 43 is 0.8 R _O above, less than 1.2R _O, fibers occupied cross-sectional area ratio r ₄ of the central region 43c of the ridge portion 43 is 0.5r _O or more and less than 0.8 r _O, fibers occupied cross-sectional area ratio r ₃ of the inner region 43b of the ridge portion 43 0.1 r 2 _O or more and less than 0.5 r 2 _O.

  Furthermore, in the third embodiment, as shown in FIG. 6, the tip end side of the flange portion 43 of the liquid diffusion sheet 41 is in contact with the absorber 12, but this flange portion bites into the absorber. As a result, there is an advantage that the liquid diffusion sheet follows the deformation of the absorbent body and the like, and the excretory liquid moves stably between the absorbent body and the liquid diffusion sheet. In addition, the liquid diffusion sheet has an effect of reinforcing the absorber.

  Moreover, although the said 1st-3rd embodiment demonstrated the case of the disposable paper diaper as an absorbent article, the absorbent article of this invention is a sanitary napkin, an incontinence pad, etc. besides this. There may be.

In order to confirm the effect of the absorbent article of the present invention, a comparative experiment for comparing the absorbency of the absorbent article according to the present invention and the absorbent article not having the configuration of the present invention was performed.
As a first example, the absorbent article according to the present invention is most liquid-impermeable when the cross section in the thickness direction of the absorbent body is divided into five equal parts in the thickness direction to form first to fifth layers. Absorption in which only the first layer located on the sheet side is a water-absorbing polymer high-body laminate, and a particularly large amount of water-absorbing polymer is contained in the first layer and the second layer adjacent to the first layer. Using the body. And the thing (henceforth "Example 1") which has the structure which has arrange | positioned the liquid diffusion sheet between the absorber and the liquid-impermeable sheet was used.
As a second example, the first layer of the absorber is a water-absorbing polymer high-body laminate, but the absorption ratio of the water-absorbing polymer contained in each layer is different from that of Example 1, and the absorption is performed. A liquid diffusion sheet provided between the body and the liquid-impermeable sheet (hereinafter referred to as “Example 2”) was used.

On the other hand, the absorbent article that does not have the configuration of the present invention, as a first example, the volume ratio of the water-absorbing polymer contained in each of the first to fifth layers is the same as in Example 2, The thing of the structure which uses the absorber from which the basic weight of the pulp fiber which comprises an absorber differs from Example 2, and does not have a liquid diffusion sheet (henceforth "the comparative example 1") was used.
As a second example, the volume ratio of the water-absorbing polymer contained in each of the first to fifth layers is the same as in Example 1, and the basis weight of the pulp fibers constituting the absorber is different from that in Example 1. A structure using an absorber and having no liquid diffusion sheet (hereinafter referred to as “Comparative Example 2”) was used.
As a third example, the volume ratio of the water-absorbing polymer contained in each of the first to fifth layers is the same as in Example 1, and the basis weight of the pulp fibers constituting the absorber is Example 1 and comparison. An absorbent body different from that of Example 2 and having no liquid diffusion sheet (hereinafter referred to as “Comparative Example 3”) was used.

Regarding Example 1, Comparative Example 2, and Comparative Example 3, the volume ratio of the water-absorbing polymer contained in each of the first to fifth layers to the water-absorbing polymer contained in the entire absorber is 35 in the first layer. %, The second layer is 34%, the third layer located in the center of the absorber is 18%, the fourth layer adjacent to the third layer is 6%, and is located on the most liquid-permeable sheet side. The fifth layer was 7%. Regarding the basis weight of the pulp fibers in the absorbent bodies of Example 1, Comparative Example 2, and Comparative Example 3, Example 1 is 170 g / m ² , Comparative Example 2 is 220 g / m ² , and Comparative Example 3 is 250 g / m ^2. It was.
Moreover, about the said Example 2 and the comparative example 1, the volume ratio of the water absorbing polymer which each layer of the 1st-5th layer with respect to the water absorbing polymer which the whole absorber contains is 25% for the first layer, The second layer was 22%, the third layer was 21%, the fourth layer was 20%, and the fifth layer was 12%. These examples 2, the basis weight of the pulp fibers in the absorbent of Comparative Example 1, Example 2 170 g / m ^2, Comparative Example 1 was 202 g / m ^2.
The basis weight of the water-absorbing polymer was 250 g / m ² in any of the examples and comparative examples.

Moreover, as a liquid diffusion sheet used in Example 1 and Example 2, NBKP (softwood bleached kraft pulp) 45%, rayon fiber (manufactured by Daiwabo Rayon Co., Ltd., trade name corona, grade 1.1 dtex × 8 mm length) A flat strip formed of a wet spunlace nonwoven fabric (basis weight 55 g / m ² ) made of 25% and beating pulp 30% was used, and the fluff surface of the liquid diffusion sheet was disposed on the absorbent body.

  And about these Example 1 and Example 2, Comparative Example 1- Comparative Example 3, the absorptivity experiment described below is conducted, and about absorption time, liquid return amount (rewetting), and the diffusion length to a longitudinal direction, excretion Assuming that the liquid was discharged three times, data for each time was obtained.

  In the absorbent test, for each absorbent article having a size of 300 mm in length, 100 mm in width, and 2.9 mm in thickness, the same component and a certain amount of artificial urine were injected into the center of the absorber. The absorption time of the artificial urine, the diffusion lengths on the liquid permeable sheet side (front surface) and the liquid impermeable sheet side (back surface), and the liquid return amount (rewetting amount) were examined.

Specifically, the test was performed according to the following procedure.
(1) An absorber is arrange | positioned at the U-shaped instrument which hold | maintains an absorbent article in the side view substantially U shape. At this time, the positions of the absorber center and the U-shaped instrument center (the lowest position) are aligned.
(2) 80 mL of artificial urine is injected into the center of the absorber at 80 mL / 10 seconds from a 100 mL burette.
(3) Record the time from the start of artificial urine injection until the artificial urine in the U-shaped device disappears as the absorption time.
(4) Three minutes after the start of the experiment, record the outline of the area where the artificial urine spreads on the front and back surfaces of the absorber.
(5) 4 minutes after the start of the experiment, spread the absorber on an acrylic flat plate of 200 mm × 450 mm and let it stand. Then, the spread of artificial urine is measured on both the front and back surfaces and recorded as the diffusion length.
(6) Five minutes after the start of the experiment, 50 g of 100 mm × 100 mm filter paper is left on the absorber with the artificial urine injection point in the middle. Further, a weight of 3.5 kg, 100 mm × 100 mm × 50 mm (height) is placed on the plate. For filter paper, the weight before the test is measured in advance.
(7) Eight minutes after the start of the experiment, the weight is removed, the weight of the filter paper is measured, the weight of the filter paper before the test is subtracted, and the difference is taken as the liquid return amount.
(8) After 9 minutes from the start of the experiment, place the sample on the U-shaped instrument again.
(9) Ten minutes after the start of the experiment, the same steps as (2) to (8) are repeated again. This is repeated up to the third round, and each result is recorded.
The results are shown in Table 1.

As can be seen from Table 1, in Examples 1 and 2 and Comparative Examples 1 to 3, the absorption time and the diffusion length of the surface were almost the same, but Example 1 and Example 2 were rewet amounts. In the evaluation of the diffusion length on the back surface, better results were obtained than in Comparative Examples 1 to 3. That is, in Example 1 and Example 2, the amount of rewet was small and the diffusion length of the back surface was long as compared with Comparative Examples 1 to 3.
This is because Example 1 and Example 2 are provided with a liquid diffusion sheet, so that the artificial urine is efficiently diffused on the liquid-impermeable sheet side of the absorber, and the artificial urine is utilized using the entire absorber. It is thought that this is because it absorbs.
Further, even when artificial urine was injected three times, the results of the rewet amount and the diffusion length on the back surface were good, so in the liquid diffusion sheet, artificial urine diffused in the liquid diffusion sheet It is considered that the liquid diffusing function is restored relatively quickly by efficiently moving to the absorber side, and artificial urine is stably absorbed by the absorber.
From the above, according to the present invention, while sufficiently ensuring the ability of the liquid diffusion sheet to repeatedly diffuse the excretory liquid, the entire absorbent body is effectively and efficiently used to improve the excretion liquid absorbing capacity. Has been demonstrated to be possible.

DESCRIPTION OF SYMBOLS 1 Paper diaper 10 Liquid permeable sheet 11 Liquid impermeable sheet | seat 12,31 Absorber 13,41 Liquid diffusion sheet 18,32 1st layer 19,33 2nd layer 20,34 3rd layer 21,35 1st 4 layers 22, 36 5th layer 23, 37 super absorbent polymer stack 24, 38 super absorbent polymer laminate 42 base 43 flange 43a surface side region 43b inner region 44 groove 44a bottom of groove

Claims (9)

A liquid-permeable sheet, a liquid-impermeable sheet, and an absorbent article having a long unidirectional absorber disposed between the liquid-permeable sheet and the liquid-impermeable sheet,
Between the absorbent body and the liquid-impermeable sheet, a liquid diffusion sheet formed of a nonwoven fabric containing cellulose fibers and extending in the longitudinal direction of the absorbent body is disposed,
The absorber includes pulp fibers and a water-absorbing polymer, and is included in the entire absorber when a cross section in the thickness direction of the absorber is divided into five layers in the thickness direction. The water-absorbing polymer high-body laminate in which the volume ratio of the water-absorbing polymer to be contained is set to be the highest with respect to the volume of the water-absorbing polymer, and the volume of the water-absorbing polymer contained in the water-absorbing polymer high-body laminate ratio is composed of a low water absorption polymer low volume layer, only the first layer located most liquid impervious sheet side is configured as a water-absorbing polymer and high laminated, included in the layer of the first The volume of the water-absorbing polymer is 25 to 50% of the volume of the water-absorbing polymer contained in the entire absorbent body,
The liquid diffusion sheet includes a base portion disposed on the liquid-impermeable sheet side, and a plurality of flange portions provided at regular intervals on the absorber side of the base portion, protruding toward the absorber side and extending in the longitudinal direction of the absorber. is formed between the ridge portion adjacent the bottom that are provided by a groove formed by the base, absorbed article. The sum of the volume of the water-absorbing polymer contained in the first layer and the second layer adjacent to the first layer is 50 to 80% of the volume of the water-absorbing polymer contained in the entire absorbent body. Item 10. An absorbent article according to Item 1 . The volume of the water-absorbing polymer contained in prior Symbol first layer, with a 33 to 50% of the volume of the water-absorbing polymer contained in the entire absorbent member, of the water-absorbing polymer low volume layer, the central absorbent body The volume of the water-absorbing polymer contained in each of the third layer, which is a layer, and the fifth layer located closest to the liquid-permeable sheet is 25 to 33 of the volume of the water-absorbing polymer contained in the entire absorbent body. a%, the absorbent article according to claim 1. A liquid-permeable sheet, a liquid-impermeable sheet, and an absorbent article having a long unidirectional absorber disposed between the liquid-permeable sheet and the liquid-impermeable sheet,
Between the absorbent body and the liquid-impermeable sheet, a liquid diffusion sheet formed of a nonwoven fabric containing cellulose fibers and extending in the longitudinal direction of the absorbent body is disposed,
The absorber includes pulp fibers and a water-absorbing polymer, and is included in the entire absorber when a cross section in the thickness direction of the absorber is divided into five layers in the thickness direction. The water-absorbing polymer high-body laminate in which the volume ratio of the water-absorbing polymer to be contained is set to be the highest with respect to the volume of the water-absorbing polymer, and the volume of the water-absorbing polymer contained in the water-absorbing polymer high-body laminate Consists of a low water-absorbing polymer body laminate with a low proportion,
The absorber includes a first layer located closest to the liquid-impermeable sheet among five layers when the cross section in the thickness direction of the absorber is divided into five equal parts in the thickness direction, and the absorber a third layer which is a central layer, Ri fifth both a layer of said water-absorbent polymer and high volume layer der located closest the liquid-permeable sheet side,
The liquid diffusion sheet includes a base portion disposed on the liquid-impermeable sheet side, and a plurality of flange portions provided at regular intervals on the absorber side of the base portion, protruding toward the absorber side and extending in the longitudinal direction of the absorber. It is formed between the ridge portion adjacent the bottom that are provided by a groove formed by the base, suction Osamusei article. The volume of the water-absorbing polymer contained in each water-absorbing polymer body laminate is 25% or more of the volume of the water-absorbing polymer contained in the entire absorbent body, and is contained in each water-absorbing polymer body laminate. The absorbent article according to claim 4 , wherein the total volume of the water-absorbing polymer is contained in the entire absorbent body and is 75% to 100% of the volume of the water-absorbing polymer. The absorbent article according to any one of claims 1 to 5 , wherein the liquid diffusion sheet is a wet spunlace nonwoven fabric. In the liquid diffusion sheet, the base has a fiber-occupied cross-sectional area ratio higher than that of the collar part, and a surface-side area in the collar part is formed to have a fiber-occupied cross-sectional area ratio higher than an area inside the surface-side area. The absorbent article according to claim 1 or 4 . The liquid diffusion sheet has a liquid absorption height after 5 minutes of artificial urine in a water absorption test by the Krem method performed in accordance with JIS P 8141: 2004 “Paper and paperboard—Water absorption test method—Krem method”. There is 130mm or more, the absorbent article according to any one of claims 1-7. The absorbent article according to any one of claims 1 to 8 , wherein a weight ratio of the water-absorbing polymer contained in the absorbent body is 0.5 or more.