JP5008383B2 - Absorbent articles - Google Patents

Description

  The present invention relates to absorbent articles such as disposable diapers and sanitary napkins.

Conventionally, in an absorbent article comprising a top sheet, a back sheet, and an absorbent body interposed between the two sheets, a surface that forms a skin contact surface in order to reduce the stickiness of the skin when worn and to improve the touch It is known to provide unevenness on the sheet to reduce the contact area with the skin. Further, in order to improve the liquid absorption performance of the absorbent body, the first surface located on the top sheet side of the absorbent body and the second surface located on the back sheet side are fibers that are constituent materials of the absorbent body Different materials with different weights and density of superabsorbent polymer particles are known.
As such an absorber, for example, the density of the superabsorbent polymer particles on the first surface side used as the liquid receiving surface is made larger than the density of the superabsorbent polymer particles on the second surface side. In addition, a fiber material having a density of the fiber material on the second surface side larger than that of the fiber material on the first surface side is known (see Patent Document 1).
Further, there is also known one in which the particle diameter of the first superabsorbent polymer particle is larger than the particle diameter of the second superabsorbent polymer particle (Patent Document 2).

JP-A-6-205806 Special Table 2000-516864

  However, in the absorber described in Patent Document 1, when the superabsorbent polymer particles swell due to liquid absorption on the first surface side where the density of the superabsorbent polymer particles is large, the swollen particles of the superabsorbent polymer Adhering to each other to form a gel layer, gel blocking occurs. Therefore, when the liquid is excreted a plurality of times, the liquid excreted after the second time has poor permeability from the first surface side to the second surface side, and quickly absorbs the liquid into the absorber. Inability to leak and cause skin problems. Further, in the absorbent body described in Patent Document 2, since the density of the fiber material on the first surface side and the second surface side is uniform, the liquid is held in the gap between the fibers also on the first surface side. As a result, the liquid returned from the absorber.

  Accordingly, an object of the present invention is to provide an absorbent article that is excellent in touch when worn, has a high liquid absorption rate in the absorbent body, and has little liquid return from the absorbent body to the topsheet.

The present invention comprises a top sheet, a back sheet, and an absorbent body interposed between the two sheets, the absorbent body comprising pulp fibers and superabsorbent polymer particles, wherein the top sheet is The laminated upper layer sheet and lower layer sheet are partially joined to form a large number of joints, and other than the joints, the upper layer sheet has a large number of convex parts, and the convex parts Between the upper layer sheet and the lower layer sheet is a cavity, the lower layer sheet is a three-dimensional sheet that is a planar sheet, the average particle size of the superabsorbent polymer on the first surface of the absorber is, An absorbent article that is larger than the average particle size of the superabsorbent polymer on the second surface, and wherein the weight of the pulp fibers on the second surface side is greater than the weight of the pulp fibers on the first surface side. The By subjecting, in which to achieve the above object.

  According to the absorbent article of the present invention, the touch at the time of wearing is excellent and the absorption speed of the liquid in the absorbent body is high, and the liquid return from the absorbent body to the top sheet is reduced.

  Hereinafter, an absorptive article of the present invention is explained based on a desirable embodiment (1st embodiment), referring to drawings. As shown in FIG. 1, the absorbent article 1 includes a top sheet 11, a back sheet 12, and an absorbent body 10 interposed between both sheets.

  As shown in FIG. 1, the top sheet 11 is a three-dimensional sheet formed by laminating two sheets, an upper layer sheet 11 </ b> A and a lower layer sheet 11 </ b> B. In the surface sheet 11, the laminated upper layer sheet 11A and lower layer sheet 11B are partially joined to form a large number of joints, and other than the joints, a large number of convex portions 15 are formed by the upper layer sheet 11A. ing. In addition, a space is formed between the upper layer sheet 11A and the lower layer sheet 11B in the convex portion 15, and the lower layer sheet 11B is a flat sheet. The top sheet 11 is arranged so that the upper layer sheet 11A faces the skin side.

Thus, by forming the many convex parts 15 in the surface sheet 11, the contact area between a wearer's skin and the surface sheet 11 becomes small, and the stickiness at the time of wear of an absorbent article is reduced. , Can improve the touch.
Further, a space is formed between the upper layer sheet and the lower layer sheet in the convex portions 15 provided in large numbers on the upper layer sheet 11A, and the air permeability of the top sheet 11 is excellent.
The surface sheet 11 is difficult to transmit liquid from the surface sheet 11 to the absorber 10 at the convex portion 15 whose inside is hollow, and is absorbed from the surface sheet 11 mainly at the joint between the upper layer sheet 11A and the lower layer sheet 11B. Permeation of the liquid to the body 10 is performed. Therefore, the surface sheet 11 has a good touch and excellent air permeability, but has a problem that the liquid permeation rate is slow, the liquid residue is generated, and the time for the skin to touch the liquid becomes long. However, in the absorbent article of this invention, this point was eliminated by using together with the absorber 10 with a high absorption speed mentioned later.

The shape of the convex portion 15 in the surface sheet 11 is not particularly limited, and examples thereof include a rectangular parallelepiped shape, a truncated quadrangular pyramid shape, and a hemispherical shape. Moreover, the convex part 15 becomes like this. Preferably the height is 1-5 mm, More preferably, it is 2-4 mm. The bottom area per protrusion 15 is preferably 0.2 to ¹ cm ² , more preferably 0.4 to 0.8 cm ² . The density (number per unit area) of the protrusions 15 is preferably 8 to 20 / cm ² , more preferably 10 to 15 / cm ² .

As the upper layer sheet 11A and the lower layer sheet 11B, the same type of sheet may be used, or different types of sheets may be used.
As the upper layer sheet 11 </ b> A and the lower layer sheet 11 </ b> B, any material that is substantially non-stretchable in a material used as a surface sheet in a conventionally known absorbent article can be used without particular limitation. For example, various nonwoven fabrics, such as a nonwoven fabric manufactured by the card method, a spunbond nonwoven fabric, a melt blown nonwoven fabric, a spunlace nonwoven fabric, and a needle punched nonwoven fabric. Moreover, the film etc. which enabled liquid permeation | transmission by the opening means can also be used. When using a nonwoven fabric as a sheet, the fineness of the constituent fibers is preferably 1 to 8 dtex, more preferably 1.5 to 5 dtex, from the viewpoint of securing the strength of the top sheet 11 and improving the touch. It is preferable that both the upper layer sheet 11A and the lower layer sheet 11B are subjected to a hydrophilic treatment using a surfactant or the like.

The basis weight of the upper layer sheet 11A is preferably 5 to 30 g / m ² , more preferably 10 to 25 g / m ² . On the other hand, the basis weight of the lower layer sheet 11B is preferably 5 to 40 g / m ² , more preferably 10 to 30 g / m ² . The overall basis weight of the surface sheet 11 including the upper layer sheet 11A and the lower layer sheet 11B is preferably 10 to 70 g / m ² , more preferably 20 to 55 g / m ² .

  As such a surface sheet 11, the surface sheet of Unexamined-Japanese-Patent No. 2004-174234 can be used, for example.

Next, the absorber 10 will be described.
The absorbent body 10 in the absorbent article 1 includes pulp fibers 2 and superabsorbent polymer particles (hereinafter also referred to as polymer particles) 3, and the first surface 1 </ b> A and the back sheet 12 positioned on the top sheet 11 side. It has the 2nd surface 1B located in the side.

  The polymer particles 3 are dispersed and arranged in the thickness direction of the absorbent body 10 while being held by the pulp fibers 2. The polymer particles 3 usually have a particle size distribution that is not constant. That is, the polymer particle 3 includes particles having a small particle size to a large particle size. As shown in FIG. 1, the polymer particle 3 has an average particle size on the first surface 1 </ b> A of the absorber 10 larger than the average particle size on the second surface 1 </ b> B. In the first embodiment, the polymer particles 3 are of two types, one having a large particle size and one having a small particle size, and a polymer particle having a large particle size in the region from the first surface 1A to half the thickness of the absorber 10. 3 is arranged, and polymer particles 3 having a small particle diameter are arranged in a region from the second surface 1B to half of the thickness of the absorber 10. In addition, when the distribution of the particle diameter of the polymer particles 3 is changed stepwise in the thickness direction of the absorber 10, the portion where the particle diameter of the polymer particles changes is limited to a half position in the thickness direction. Instead, it may be closer to the top sheet 11 than half, and may be closer to the back sheet 12. In addition, the particle size distribution may change in multiple stages.

  Furthermore, the distribution of the particle size of the polymer particles 3 in the thickness direction of the absorbent body 10 is larger than the particle size of the polymer particles 3 on the first surface 1A between the first surface 1A and the second surface 1B. You may have the area | region in which the polymer particle 3 with a big diameter was distribute | arranged. Moreover, even if it has the area | region where the polymer particle 3 smaller than the particle size of the polymer particle 3 in the 2nd surface 1B was distribute | arranged between the 1st surface 1A and the 2nd surface 1B. Good. In short, the particle size of the polymer particles 3 on the first surface 1A only needs to be larger than the particle size of the polymer particles 3 on the second surface 1B.

Here, the particle diameter of the polymer particle 3 is the diameter of the sphere when the polymer particle 3 is spherical, and the average of the short axis and the long axis when the polymer particle 3 is not spherical. The value is defined as the particle diameter of the polymer particle 3.
The particle size of the polymer particles 3 arranged on the first surface 1A is preferably 300 to 800 μm, more preferably 350 to 700 μm. On the other hand, the particle size of the polymer particles 3 arranged on the second surface 1B is preferably 50 to 300 μm, more preferably 100 to 250 μm.

The average density of the polymer particles 3 on the first surface 1A side is preferably larger than the average density of the polymer particles 3 on the second surface 1B side. Specifically, the average density of the polymer particles 3 in the first surface 1A side is preferably 0.1 to 0.8 g / cm ^3, more preferably at 0.2-0.5 g / cm ^3. The average density of the polymer particles 3 on the second surface 1B side is preferably 0.03 to 0.3 g / cm ³ , more preferably 0.05 to 0.25 g / cm ³ .

The average density of the polymer particles 3 on the first surface 1A side and the polymer particles 3 on the second surface 1B side is measured, for example, as follows.
First, the thickness L0 of the absorber 10 and the area S of the test piece are measured. Next, the absorbent body 10 is divided in half in the thickness direction (50% region). Each of the absorbents divided in half is vibrated by a vibrator in a state where the absorbent is placed on a mesh to the extent that the polymer particles 3 fall, and the pulp fibers 2 and the polymer particles 3 are classified. The density of the polymer particles 3 on each side is calculated by dividing the weight of the dropped polymer particles 3 by the volume of each absorber (= L0 / 2 × S). Further, N = 5 of this value is taken as the average density on each side.

  Furthermore, it is preferable to use a polymer particle 3 having a high liquid passing rate. Specifically, the liquid passing speed of the polymer particles 3 is preferably 20 ml / min or more, more preferably 40 ml / min or more.

The liquid passing speed of the polymer particles 3 is measured under a 2.0 kPa load. This load substantially corresponds to the body pressure applied to the absorbent body while wearing the absorbent article.
A specific method for measuring the flow rate is described in paragraph 0005 of Japanese Patent Laid-Open No. 2003-235889, for example. In the present invention, measurement is performed by changing 0.200 g, which is the weight of the sample used in the measurement method described in this publication, to 0.32 g. Specifically, the flow rate is measured by the following procedure.

[Measurement method of flow rate]
The gel flow rate is a filtration cylinder having a vertically arranged cylinder (inner diameter: 25.4 mm) and a narrow tube (inner diameter: 4 mm, length: 8 cm) with a metal mesh (mesh opening: 150 μm) and a cock (inner diameter: 2 mm) at the lower end In the tube, with the cock closed, 0.32 g of a measurement sample adjusted to a particle size of 850 to 150 μm was poured, 50 ml of physiological saline was poured, and after standing for 30 minutes, a wire mesh (mesh 150 μm) , 25 mm diameter) load (21.2 g) was inserted into the filtration cylinder so that the wire mesh and measurement sample were in contact, and after 1 minute, the weight (77.0 g) was placed on the wire mesh load and allowed to stand for 1 minute. Then, the cock is opened, and the time (T1) (seconds) until the liquid level of 0.9 wt% physiological saline reaches the 20 ml scale line from the 40 ml scale line is obtained from the following formula { (T0) It is the time when there is no constant sample}.
Flow rate (ml / min) = 20 × 60 / (T1-T0)

  A more detailed method for measuring the flow rate is described in paragraphs 0008 and 0009 of the above publication. The measuring device is described in FIGS. 1 and 2 of the publication.

Thus, since the average density of the polymer particles 3 on the first surface 1A side of the absorber 10 is larger than the average density of the polymer particles 3 on the second surface 1B side, the first surface 1A side Then, a structure in which the pulp fibers 2 are difficult to pack in the gap between the polymer particles 3 is formed, and the closest distance between the polymer particles 3 is very short. On the other hand, since the pulp fiber 2 separates the polymer particles 3 on the second surface 1B side, the closest distance between the polymer particles 3 is longer than the first surface 1A side.
In such a structure, since the liquid introduction paths formed by the pulp fibers 2 are discontinuous or separated from each other on the first surface 1A side and the second surface 1B side, the second surface The liquid that has returned from the 1B side cannot pass through the first surface 1A side, and has the effect of making it difficult to return the liquid.
On the other hand, on the first surface 1A side with a small amount of fibers, the liquid introduction effect by the pulp fibers 2 is small. Therefore, in particular, by using a polymer particle 3 having a high liquid passage speed of 20 mL / min or more under a load of 2.0 kPa, the liquid permeation speed on the first surface 1A side is increased. Can do.
Thus, by making the average density of the polymer particles 3 different between the first surface 1A side and the second surface 1B side, liquid return from the second surface 1B side to the first surface 1A side is prevented. As a result, liquid return from the absorbent body 10 to the top sheet 11 can be reduced. Further, by defining the physical properties (liquid passing speed) of the polymer particles 3, the permeation speed of the liquid is not impaired by the presence of the polymer particles 3 having a high liquid passing speed on the first surface 1A side where the polymer density is high. .

In the absorbent body 10, as shown in FIG. 1, the weight of the pulp fiber 2 on the second surface 1B side is larger than the weight of the pulp fiber 2 on the first surface 1A side.
Here, the weight of the pulp fiber on the first surface 1A side and the weight of the pulp fiber on the second surface 1B side refer to the amount of fiber per unit area in each region on the surface side. That is, the absorbent body 10 has a region with a large amount of fiber on the second surface 1B side and a region with a small amount of fiber on the first surface 1A side. In the first embodiment, the first surface 1A to half of the thickness of the absorbent body 10 is a region having a small amount of fiber, and the second surface 1B to half of the thickness of the absorbent body 10 is fiber. It is a large area.

  Moreover, the 1st surface 1A side means the area | region of the vicinity including the 1st surface 1A in the thickness direction of the absorber 10, and the 2nd surface 1B side is the 2nd in the thickness direction of the absorber 10. FIG. The area | region of the vicinity containing the surface 1B of this. Further, the region in the vicinity of the first surface and the region in the vicinity of the second surface preferably refer to a range from the first surface 1A and the second surface 1B to 50% of the thickness of the absorber 10, and more preferably. Refers to a range of up to 30%.

The distribution of the fiber amount of the pulp fiber 2 in the thickness direction of the absorbent body 10 is not limited to the distribution form shown in FIG. For example, the part where the fiber amount of the pulp fiber 2 changes is not limited to the half position in the thickness direction, and may be on the surface sheet 11 side or the back sheet 12 side than the half. Moreover, the fiber amount may increase continuously from the first surface 1A toward the second surface 1B. That is, the weight of the pulp fiber 2 on the second surface 1B side only needs to be larger than the weight of the pulp fiber 2 on the first surface 1A side.
The fiber amount on the first surface 1A side is preferably 25 to 150 g / m ² , more preferably 50 to 100 g / m ² . On the other hand, the amount of fibers on the second surface 1B side is preferably 100 to 300 g / m ² , more preferably 150 to 250 g / m ² .

  Thus, since the particle size and the fiber amount of the polymer particles 3 are different between the first surface 1A and the second surface 1B, the porosity on the first surface 1A side and the second surface 1B side This is different from the porosity. In the first embodiment, the porosity on the first surface 1A side is larger than the porosity on the second surface 1B side. The porosity on the first surface 1A side and the porosity on the second surface 1B side are measured according to the following porosity measurement method.

[Measurement method of porosity]
First, a cross section in the thickness direction of the absorber 10 is observed with a microscope, and a cross-sectional photograph thereof is taken. The obtained cross-sectional photograph is analyzed with image analysis software (Image-Pro Plus, manufactured by Nippon Visual Science Co., Ltd.). The area of the region without the pulp fibers 2 and the polymer particles 3 in each of the region on the first surface 1A side and the region on the second surface 1B side in the cross-sectional photograph is measured, and the area is defined as the space area. The area of the void in the region on the first surface 1A side and the area of the void in the region on the second surface 1B side obtained are the cross-sectional area of the region on the first surface 1A side and the region on the second surface 1B side, respectively. The porosity is obtained by dividing by the cross-sectional area. Here, the porosity of the region of 50% in the thickness direction of the absorber from the first surface 1A is compared with the porosity of the region of 50% in the thickness direction of the absorber from the second surface 1B.

When the polymer particles 3 having a large particle diameter are arranged on the first surface 1A and the polymer particles 3 having a small particle diameter are arranged on the second surface 1B, the absorption rate of the absorber 10 is increased.
In general, the larger the particle size of the polymer particle 3, the smaller the surface area per unit weight and the slower the rate of absorbing the liquid into the polymer particle 3. In addition, since the polymer particles 3 having a large particle size are difficult to close-pack, a large number of large spaces are formed between the polymer particles 3. Therefore, the liquid that has entered from the first surface 1A side is not immediately absorbed by the polymer particles disposed on the first surface 1A side having a large particle size, but is directly on the second surface 1B side of the absorber 10. Flow down toward Moreover, the amount of fibers on the first surface 1A side is less than the amount of fibers on the second surface 1B side, and has a sparse structure with large gaps between the fibers, and the diffusibility of the liquid in the planar direction is low. In addition, after the polymer particles 3 having a large particle size are swollen by repeatedly absorbing the liquid, the swollen polymer particles 3 are not in contact with each other and do not form a gel layer, so that the liquid is quickly transmitted. Accordingly, the liquid does not diffuse so much in the planar direction on the first surface 1A side, and quickly reaches the second surface 1B side on which the polymer particles 3 having a small particle diameter are arranged.

  Since the polymer particle 3 having a small particle size has a large surface area per unit weight, and the rate of absorbing the liquid into the polymer particle 3 is high, the liquid that has reached the second surface 1B side has a small particle size. Is absorbed quickly. Further, the amount of fibers on the second surface 1B side is larger than the amount of fibers on the first surface 1A side, and has a dense structure with small gaps between the fibers. It diffuses widely in the direction, and improves the liquid absorption on the second surface 1B side. Excess liquid that has not been absorbed by the polymer particles 3 having a small particle diameter is absorbed by the polymer particles 3 having a large particle diameter disposed on the first surface 1A side.

  In the first embodiment, as described above, the liquid is quickly transmitted to the second surface 1B side without diffusing much in the plane direction on the first surface 1A side, and the liquid is quickly absorbed on the second surface 1B side. In addition, the absorption speed of the liquid in the absorber 10 is increased by diffusing the absorbed liquid widely in the plane direction. Further, as described above, the liquid absorbed on the second surface 1B side is unlikely to return to the first surface 1A side. In addition, when the absorber 10 is pressurized or the like, the liquid that attempts to return to the first surface 1A side is absorbed by the polymer particles 3 having a large particle diameter. Thus, the liquid return from the absorber 10 is reduced in all actual conditions (presence / absence of pressure, posture, urine volume). In addition, since the liquid quickly permeates into the absorbent body 10, the time for which the liquid remains on the topsheet is shortened, and the liquid remaining in the topsheet is not squeezed, so that the absorbent body 10 exhibits a dry feeling.

  Furthermore, since the space between the particles of the polymer particle 3 having a large particle size is larger than that of the polymer particle 3 having a small particle size, the polymer particle 3 having a large particle size absorbs the liquid and swells. Even if the volume increases, the increase in the volume can be absorbed in the space. Therefore, gel blocking is unlikely to occur on the first surface 1A side. On the other hand, the polymer particle 3 having a small particle size tends to be gel-blocking more easily than the polymer particle 3 having a large particle size. However, on the second surface 1B side, the amount of the pulp fiber 2 is large. The pulp fibers 2 are interposed between the polymer particles 3 having a diameter to prevent contact between the polymer particles 3, and gel blocking is effectively prevented.

  As the polymer particles 3, the same particles as those used in conventional absorbent articles can be used without particular limitation. Specifically, a polyacrylic acid soda (acrylic acid-vinyl alcohol) copolymer, a polyacrylic acid soda cross-linked product, a (starch-acrylic acid) graft polymer, an (isobutylene-maleic anhydride) copolymer and its ken Compound, potassium polyacrylate, cesium polyacrylate, and the like.

Examples of the pulp fiber 2 that holds the polymer particles 3 include wood pulp such as softwood kraft pulp and hardwood kraft pulp, natural cellulose fiber such as cotton pulp, and straw pulp.
The fiber length of the pulp fiber 2 is preferably 0.1 to 10 mm, more preferably 0.5 to 3 mm.

  Although not shown, it is also preferable that the absorbent body 10 is wrapped with various sheet materials (hereinafter also referred to as a core wrap sheet). The core wrap sheet may be disposed on the upper surface and / or the lower surface of the first surface 1A and / or the second surface 1B. Examples of the core wrap sheet include paper such as tissue paper, nonwoven fabric (for example, spunbond nonwoven fabric, SMS (spunbond-meltblown-spunbond) nonwoven fabric, airlaid nonwoven fabric) and the like.

Next, the preferable manufacturing method of the absorber 10 mentioned above is demonstrated.
The absorber 10 shown in FIG. 1 can be manufactured by the manufacturing apparatus 20 shown in FIG. 2, for example.
As shown in FIG. 2, the absorbent body manufacturing apparatus 20 includes a rotating drum 30 having a plurality of accumulation recesses 40 formed on the outer peripheral surface at predetermined intervals, and one end portion that covers a part of the outer peripheral surface of the rotating drum 30. And a duct 50 that supplies the raw material of the absorber in a scattered state to the outer peripheral surface of the rotary drum 30.

  The rotating drum 30 has a cylindrical shape and is driven to rotate in the direction of arrow A in FIG. On the outer peripheral surface of the rotating drum 30, there are formed recesses 40, 40,. An intake fan (not shown) is connected to the rotary drum 30, and the partitioned spaces B and C in the rotary drum are maintained at a negative pressure by driving the intake fan. A large number of pores (not shown) are formed on the bottom surface of each of the accumulation recesses 40, and the accumulation recesses pass through the space where the accumulation recesses are maintained at a negative pressure. The pores on the bottom surface of each function as suction holes.

Near the end of the duct 50 opposite to the rotating drum 30 side, a fiber material supply device (not shown) that supplies fiber material such as pulp fibers in a scattered state into the duct 50 is provided. Further, a polymer introduction port 51 for introducing the polymer particles 3 into the duct 50 is provided between the rotary drum 30 and the fiber material introduction site in the duct 50.
As shown in FIGS. 3 and 4, the duct 50 has an internal space having a rectangular cross section surrounded by an upper surface 52, a lower surface 53, and a pair of side surfaces 54, 54. As shown in FIG. 4, the internal space of the duct 50 is gently up and down from the introduction portion of the fiber material to the intermediate portion between the introduction portion of the polymer particles and the rotating drum 30 through the introduction portion of the polymer particles. In the vicinity of the rotating drum 30, it expands rapidly in the vertical direction. On the other hand, the pair of side surfaces 54, 54 of the duct 50 are substantially parallel to each other over substantially the entire length of the drum. Hereinafter, the upper surface 52, the lower surface 53, and the side surface 54 constituting the inner wall surface of the duct 50 are referred to as the upper surface 52, the lower surface 53, and the side surface 54 of the duct 50, respectively.

The absorbent body manufacturing apparatus 20 is configured to introduce the polymer particles 3 into the duct 50 from two polymer inlets 51 provided on both sides of the upper half of the internal space of the duct 50. As shown in FIG. 4, the polymer inlet 51 is formed in the vicinity of the intersections 55, 55 between the upper surface 52 in the duct 50 and the side surfaces 54, 54. More specifically, it is formed near the upper surface 52 of the pair of side surfaces 54, 54 of the duct 50. The polymer inlet 51 opens in a rectangular shape on the inner wall surface of the duct 50.
A pocket-shaped connecting member 56 is attached to the outer wall surface of the duct 50 at the portion where the polymer inlet 51 is formed. The pocket-shaped connecting member 56 can be fixed by inserting one end portion of the polymer supply pipe 57. The other end of the polymer supply pipe 56 is connected to a polymer container 58. The polymer accommodated in the polymer accommodating portion 58 is divided into two polymer supply pipes 57 in equal amounts, and each is introduced into the duct from the polymer introduction port 51.

  The movement of the polymer from the polymer container 58 to the polymer inlet 51 is mainly a natural fall due to gravity, but a blowing means such as an air supply fan is provided on the polymer container 58 side to assist the movement of the polymer. May be. The start and stop of the introduction of the polymer from the polymer introduction port 51 is performed by rotating or stopping a large screw-like member called an auger (not shown) provided in the polymer container 58. Can do. The polymer is introduced by filling the polymer into the hole (gap) of the auger screw and rotating the auger. The amount of polymer introduced is adjusted by the rotational speed of the auger. The introduction of the polymer is stopped by stopping the auger and stopping the supply of the polymer to the polymer introduction port 51.

In the absorbent body manufacturing apparatus 20, as shown in FIGS. 2 and 3, substantially triangular pyramid-shaped members 41, at positions closer to the rotary drum 30 than the polymer inlet 51, on each side surface 54 of the duct 50, 42 is fixed. A triangular prism-shaped member 43 is provided on the lower surface 53 of the duct 50 at a position closer to the rotating drum 30 than the polymer inlet 51. By providing the members 41, 42 and 43, the volume of the internal space of the duct 50 is reduced, and the flow velocity of the airflow in the duct 50 is increased. Further, depending on the shape of the members 41, 42, and 43, air current is disturbed in the internal space of the duct 50 on the rotating drum 30 side than the members 41, 42, and 43. In the absorbent body manufacturing apparatus 20, the members 41, 42 are provided in the internal space of the duct 50 on the rotary drum 30 side of the members 41, 42, 43 due to the substantially triangular pyramid shape of the members 41, 42. Turbulence occurs in the space above the position. Further, turbulence does not occur in the space below the position where the members 41 and 42 are provided.
The shape of the members 41 and 42 is not particularly limited as long as it can change the flow velocity of the air flow and generate turbulence.

  The absorbent body manufacturing apparatus 20 further includes a first core wrap sheet supply mechanism for supplying the first core wrap sheet 5B onto the outer peripheral surface of the rotating drum 30 before the raw material is deposited on the accumulation recess 40, and an accumulation recess. The second core wrap sheet supply mechanism for supplying the second core wrap sheet 5A onto the outer peripheral surface of the rotating drum 30 after the raw material is deposited on the first and the first and first immediately before being supplied onto the outer peripheral surface of the rotating drum. Two adhesive coating apparatuses 6A and 6B for applying an adhesive to the two-core wrap sheets 5A and 5B are provided.

In order to manufacture the absorber 10 using the absorber manufacturing apparatus 20, first, the rotary drum 30 is rotated and the intake fan is operated. Further, the first and second core wrap sheet supply mechanisms and the adhesive coating apparatuses 6A and 6B are operated.
By the operation of the intake fan, a suction force is generated on the bottom surface of the accumulation recess 40 located on the space B, and an air flow flowing toward the outer peripheral surface of the rotary drum 30 is generated in the duct 50.
Then, the fiber material is introduced into the duct 50 so as to be scattered, and polymer particles are introduced into the duct 50 from the two polymer introduction ports 51.

  First, the first core wrap sheet 5B is supplied to the rotating drum 30. The fiber material and polymer particles introduced into the duct are supplied in a scattered state toward the rotating drum, and are sucked into the accumulation concave portion 40 in the state where the inner surface is covered with the sheet 5B in the rotating drum 30. accumulate. And the 2nd core wrap sheet | seat 5A is supplied on the recessed part 40 for accumulation | stacking after these have accumulated.

  Here, in the manufacturing apparatus shown in FIG. 2, when the polymer particles 3 having two sharp particle size distribution peaks are introduced into the duct 50 from each of the pair of polymer inlets 51 provided at two locations on both sides of the duct 50, Since the introduced polymer particles fall faster as the particle diameter becomes larger, the polymer particles having a larger particle diameter are larger than the space in the duct 50 where turbulence is not generated, that is, the position where the members 41 and 42 are provided. The accumulation concave portion 40 that is conveyed in the lower space and rotates is deposited on the bottom surface of the accumulation concave portion 40 when positioned in the lower portion B1 in the portion covered with the duct 50. In addition, among the polymer particles that have been swollen by the turbulent air, the smaller the particle size, the more the particles are conveyed. The polymer particles having a small particle size are deposited on the surface of the accumulation recess 40 when the rotating accumulation recess 40 is positioned in the upper portion B3 in the portion covered with the duct 50. That is, polymer particles 3 having a large particle size are deposited on the bottom surface (inner surface) and those having a small particle size are deposited on the surface (outer surface) in the accumulation recess 40 provided on the rotary drum 30.

The polymer particles 3 having such two sharp particle size distribution peaks can be obtained by mixing two kinds of polymer particles 3 having monodispersed particle size distributions each having a different average particle size. In this case, two types of polymer particles 3 having different characteristics can be used.
Further, by classifying the polymer particles 3 having a single peak particle size distribution, it is also possible to obtain a portion having a desired particle size of a large particle size and a small particle size. In this case, it is possible to obtain two particle sizes having significantly different physical properties in one kind of polymer particles 3.

  The pulp fibers 2 supplied from the fiber material supply device are conveyed in a uniformly dispersed manner in the duct 50 on the front side of the portion where the members 41 and 42 are provided. Since the pulp fiber 2 is more strongly affected by the airflow than the polymer particles because of its shape, most of the pulp fiber 2 is swollen by the turbulent air on the rotating drum 30 side of the portion where the members 41 and 42 are provided. A small amount of pulp fiber 2 is transported through a space where no turbulent airflow occurs. Therefore, when the rotating accumulation recess 40 is positioned in the lower portion B1 in the portion covered with the duct 50, the amount of the pulp fibers 2 deposited on the bottom surface of the accumulation recess 40 is reduced. Further, when the rotating accumulation recess 40 is positioned in the upper portion B3 in the portion covered with the duct 50, the amount of the pulp fiber 2 deposited on the surface of the accumulation recess 40 increases. That is, in the accumulation recess 40 provided in the rotary drum 30, the amount of the pulp fibers 2 deposited on the bottom surface (inner surface) side decreases, and the amount of the pulp fibers 2 deposited on the surface (outer surface) side increases.

The accumulation of the fiber material and the polymer particles in the accumulation recess 40 has a configuration in which the polymer particles 3 are contained in a fiber aggregate composed of the pulp fibers 2, and these are the first and second core wrap sheets 5A, What is intermittently disposed between 5B is a continuous body 10A of the absorber. The pulp fiber 2 and polymer particle 3 deposits are conveyed to the deposit discharge section E, and are pulled and accumulated in a direction away from the rotary drum 30 while being sandwiched between the first and second core wrap sheets 5A and 5B. The mold is released from the recess 40 for use.
The absorbent continuum 10 </ b> A away from the outer peripheral surface of the rotating drum 30 is conveyed by an arbitrary conveying means such as a belt conveyor, and is cut at a portion where the pulp fibers 2 and polymer particles 3 are not deposited in a subsequent process. Thus, an individual absorber 10 is obtained.

The thickness of the absorber 10 is preferably 1 to 5 mm, more preferably 2 to 3 mm.
The basis weight of the whole absorbent member 10 is preferably 40~700g / m ^2, more preferably a 100 to 500 g / m ^2. The basis weight of the pulp fiber 2 in the absorbent body 10 is preferably 20 to 350 g / m ² , more preferably 50 to 250 g / m ^2. The basis weight of the polymer particles 3 in the absorbent body 10 is preferably 20 It is -350g / m < ² >, More preferably, it is 50-250g / m < ² >.

In the absorbent article 1, it is preferable that a sheet (not shown) different from the surface sheet 11 is disposed between the absorbent body 10 and the surface sheet 11. Such another sheet is generally called a second sheet.
By arranging the second sheet, the liquid permeability from the top sheet 11 to the absorber 10 is improved. Furthermore, the evaporation of the liquid absorbed by the absorber 10 can be suppressed, and the liquid return from the absorber 10 to the top sheet 11 can be reduced. Furthermore, the deterioration of the touch caused by the polymer particles 3 having a large particle diameter disposed on the first surface 1A of the absorbent body 10 can be suppressed. For such a purpose, the second sheet is preferably a bulky material having a certain thickness. Specifically, the second sheet preferably has a thickness of 0.1 to 5 mm.

The second sheet is preferably made of a hydrophilic nonwoven fabric or a hydrophilic fiber assembly. Moreover, what laminated | stacked the fiber assembly on the nonwoven fabric can also be used. Examples of the nonwoven fabric include an air-through nonwoven fabric, a resin bond nonwoven fabric, a spunlace nonwoven fabric, and an airlaid nonwoven fabric.
Natural fibers, semi-synthetic fibers, and synthetic fibers can be used as the fibers constituting the nonwoven fabric and the fiber assembly. Examples of natural fibers include pulp, cotton, hemp and the like. Examples of semisynthetic fibers include triacetate fibers and diacetate fibers. As synthetic fibers, single fibers of polyethylene, polyethylene terephthalate, polypropylene, polyvinyl alcohol, and composite fibers containing two or more of these resins can be used. Examples of the composite fiber include a core-sheath type, a side-by-side type, and an eccentric type.

The second sheet preferably has a higher hydrophilicity than the top sheet. Moreover, it is preferable that the density of a second sheet is larger than the density of a surface sheet. Further, the hydrophilicity and density of the second sheet may change in the thickness direction of the second sheet.
The basis weight of the second sheet is preferably 10 to 50 g / m ^2.

  As the back sheet 12 in the absorbent article 1 of the present invention, materials that are usually used in the technical field can be used without particular limitation. As the back sheet 12, a liquid-impermeable or water-repellent sheet such as a thermoplastic resin film or a laminate of the film and a nonwoven fabric can be used. The back sheet 12 may have water vapor permeability.

  According to the absorbent article 1 of the present invention having the above-described configuration, the topsheet 11 has a large number of convex portions 15 and the inside of the convex portions 15 is a three-dimensional sheet that is hollow, so that air permeability is improved. In addition to being excellent, it reduces the stickiness of the skin and is excellent in the touch. The absorbent body 10 has a particle size of the superabsorbent polymer on the first surface larger than that of the superabsorbent polymer on the second surface, and the weight of the pulp fiber on the second surface side is Since it is larger than the weight of the pulp fiber on the surface side of 1, the absorption speed of the liquid in the absorbent body 10 is fast. Therefore, even when the top sheet 11 having a low liquid permeation rate is used, the liquid that has permeated through the top sheet 11 can be quickly absorbed, and the remaining liquid in the top sheet 11 can be reduced.

  The absorbent article 1 of the present invention may further include various members depending on the specific application of the absorbent article. Such members are known to those skilled in the art. For example, when applying an absorbent article to a disposable diaper or a sanitary napkin, a pair or two or more pairs of three-dimensional guards can be disposed on the left and right sides of the topsheet.

In the first embodiment, the absorbent article 1 is arranged so that the first surface 1A of the absorbent body 10 is located on the top sheet side, but the second surface 1B of the absorbent body 10 is the surface. You may arrange | position and use so that it may be located in the sheet | seat 11 side.
In this case, since the excreted liquid is diffused widely in the planar direction on the second surface 1B side which is the liquid receiving surface and then transmitted to the first surface 1A side, the liquid is absorbed once. This is excellent in that the entire surface of the absorber 10 can be used. Therefore, the amount of excretion such as light incontinence and panty liner is small, and it can be suitably used for an absorbent article that is relatively replaced by a single excretion.

Next, 2nd Embodiment of the absorbent article of this invention is described. About 2nd Embodiment, a different point from 1st Embodiment mentioned above is demonstrated, the same point attaches | subjects the same code | symbol and abbreviate | omits description. For the points that are not particularly described, the description of the first embodiment is applied as appropriate.
In the absorbent article 1 of 2nd Embodiment, as shown in FIG. 5, compared with 1st Embodiment, between the 1st surface 1A side and 2nd surface 1B side in the absorber 10, as shown in FIG. It differs in that it has a region 1C in which the weight of the pulp fiber 2 is larger than the region on the first surface 1A side and the region on the second surface 1B side.
The weight of the pulp fiber 2 in the region 1C where the weight of the pulp fiber 2 in the second embodiment is high is preferably 50 to 200 g / m ² , more preferably 100 to 150 g / m ² .

  According to the absorbent article 1 of 2nd Embodiment, the liquid which has permeate | transmitted the area | region of the 1st surface 1A side by providing the area | region 1C with much weight of the pulp fiber 2 in the center vicinity of the thickness direction of the absorber 10. Since the liquid can be transferred to the region on the second surface 1B side after being diffused widely in the planar direction in the region 1C, the area where the liquid can be transferred to the second surface 1B side is increased. The amount of the polymer particles 3 that are in contact with each other during the excretion of the liquid increases and the absorption efficiency increases. Moreover, when the area | region 1C with much weight of the pulp fiber 2 exists in the center vicinity of the thickness direction of the absorber 10, when the absorber 10 is pressed from any surface of the 1st surface 1A and the 2nd surface 1B, it is. Has a good texture and excellent cushioning.

  In order to form the absorbent body 10 having the region 1C where the pulp fiber is heavy in the central region in the thickness direction of the absorbent body, like the absorbent body 10 in the absorbent article 1 of the second embodiment, the production shown in FIG. In the apparatus, the characteristics (specific gravity, thickness, length, shape, etc.) of the pulp fiber to be introduced are adjusted to control the transport distance of the pulp fiber, and the rotating recess 40 for accumulation is covered with the duct 50 in the rotary drum 30. The pulp fibers may be densely deposited when positioned in the central portion B2 in the vertical direction of the portion.

FIG. 6 shows an absorbent article according to a third embodiment of the present invention. In 3rd Embodiment, as shown in FIG. 6, the absorber is formed from the upper layer absorber 14 located in the surface sheet side, and the lower layer absorber 13 located in the back surface sheet 12 side. That is, the absorbent article of the third embodiment is the same as the first embodiment except that the absorbent body is formed by laminating two absorbent bodies in the absorbent article of the first embodiment shown in FIG. It is the composition. The upper layer absorber 14 has an average particle size of the polymer particles 3 on the first surface 14A located on the top sheet 2 side, and an average particle size of the polymer particles 3 on the second surface 14B located on the lower layer absorber 13 side. The weight of the pulp fiber 2 on the second surface 14B side is larger than the weight of the pulp fiber 2 on the first surface 14A side. In the lower layer absorber 13, the average particle size of the polymer particles 3 on the first surface 13A located on the upper layer absorber 14 side is the average particle size of the polymer particles 3 on the second surface 13B located on the back sheet 13 side. It is larger and the weight of the pulp fiber 2 on the first surface 13A side is smaller than the weight of the pulp fiber 2 on the second surface 13B side .
Thus, by laminating two absorbers, a large amount of liquid can be absorbed while maintaining the liquid absorption speed.

FIG. 7 shows an absorbent article according to a reference example of the present invention. This absorbent article is outside the scope of the present invention, but for convenience, will be referred to as the fourth embodiment. The fourth embodiment is different from the third embodiment in that the lower layer absorber 13 is arranged upside down. That is, in the absorbent article of the fourth embodiment, as shown in FIG. 7, the absorbent body 10 includes an upper layer absorbent body 14 located on the top sheet 2 side and a lower layer absorbent body 13 located on the back sheet 3 side. Has been formed. The upper layer absorber 14 has an average particle size of the polymer particles 3 on the first surface 14A located on the top sheet 2 side, and an average particle size of the polymer particles 3 on the second surface 14B located on the lower layer absorber 13 side. The weight of the pulp fiber 2 on the second surface 14B side is larger than the weight of the pulp fiber 2 on the first surface 14A side. The lower layer absorber 13 has an average particle size of the polymer particles 3 on the first surface 13A located on the back sheet 3 side, and an average particle size of the polymer particles 3 on the second surface 13B located on the upper layer absorber 14 side. The fourth embodiment in which the weight of the pulp fiber 2 on the second surface 13B side is larger than the weight of the pulp fiber 2 on the first surface 13A side is the same as in the third embodiment. An effect is produced.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to embodiment mentioned above, As long as it does not deviate from this invention, it can change suitably.
For example, in the first embodiment, in the first embodiment, the porosity of the first surface 1A is larger than the porosity of the second surface 1B, but the porosity of the second surface 1B is the first. It may be larger than the porosity of the surface 1A.
Further, in the third embodiment and the fourth embodiment, the upper layer absorbent body 14 is arranged such that the first surface 14A is positioned on the topsheet 11 side, but the second surface 14B is the surface. You may distribute | arrange so that it may be located in the sheet | seat 11 side.
Moreover, the absorbent article of this invention is not restricted to a disposable diaper or a sanitary napkin, An incontinence pad etc. may be sufficient.

  Hereinafter, preferred specific examples of the present invention will be described. However, the scope of the present invention is not limited to such examples.

[Example 1]
The disposable diaper which is an absorptive article of the present invention was manufactured using the following materials.
First, the absorber shown in FIG. 1 was manufactured using the manufacturing apparatus shown in FIG. [NB416] manufactured by Wafer User Co. was used as the pulp fiber. [IM930] manufactured by Sundia Co., Ltd. was used as the polymer particles.
The obtained absorbent had a basis weight of 489 g / m ² and a thickness of 2.0 mm. The basis weight of the pulp fibers in the entire absorbent body was 195 g / m ² , and the basis weight of the polymer particles was 294 / m ² . The average particle size of the polymer particles on the first surface was about 500, and the particle size of the polymer particles on the second surface was about 125 m. The weight of the pulp fiber on the first surface side was 80 g / m ² , and the weight of the pulp fiber on the second surface side was 115 / m ² . As a result of observing the cross section in the thickness direction of the absorber with an electron microscope, it was confirmed that the absorber had the structure shown in FIG.

As the surface sheet 11, a surface sheet described in JP-A No. 2004-174234 was used. As the upper layer sheet 11A and the lower layer sheet 11B, an air-through nonwoven fabric was used, and the constituent fiber was a core-sheath type composite fiber made of polyethylene terephthalate and polyethylene. The fineness of the constituent fibers was 2.2 dtex, and the average fiber length was 51 mm. The basis weight of the upper layer sheet was 10 g / m ² , and the basis weight of the lower layer sheet 11B was 20 g / m ² . The upper layer sheet 11A and the lower layer sheet 11B were each subjected to a hydrophilic treatment using a surfactant.
The height of the convex portion 15 was 2 mm, and the bottom area of one convex portion 15 was 0.07 cm ² . The basis weight of the entire surface sheet 11 was 30 g / m ² .
A moisture permeable sheet was used as the back sheet 12.
Other than that, according to the manufacturing method of a normal disposable diaper, the disposable diaper which is the absorbent article of this invention was obtained.

[Example 2]
A disposable diaper was obtained in the same manner as in Example 1 except that a second sheet was disposed between the absorbent body of Example 1 and the top sheet.
As the second sheet, an air-through nonwoven fabric was used, and the constituent fiber was a core-sheath type composite fiber made of polyethylene terephthalate and polyethylene. The basis weight of the second sheet was 40 g / m2. The second sheet was hydrophilized using a surfactant.

[Comparative Example]
In the apparatus 20 used in the embodiment, members 41, 42, and 43 that cause changes in turbulence and flow velocity are removed, the introduction position of the polymer is changed from the side surface to the upper surface of the duct, and the input port is changed from two to one. Then, the polymer particles and the pulp fibers were piled up, and an absorbent body of a comparative example in which there was no change in the weight of the pulp fibers and no change in the average particle diameter of the polymer particles in the thickness direction of the absorbent body was produced.
The obtained absorbent had a basis weight of 514 g / m ² and a thickness of 3.2 mm. The basis weight of the pulp fibers in the entire absorbent body was 257 g / m ² , and the basis weight of the polymer particles was 257 g / m ² . The average particle size of the polymer particles was 350 μm.
Otherwise, a disposable diaper was obtained in the same manner as in the example. As a result of observing the cross section in the thickness direction of the absorber with an electron microscope, changes in the weight of the pulp fibers and changes in the average particle diameter of the polymer particles were not observed over the thickness direction of the absorber.

[Evaluation]
About the disposable diaper obtained by the Example and the comparative example, the liquid absorption time and the liquid return amount were measured with the following method. The results are shown in Table 1.

(Measurement of liquid absorption time)
The diapers obtained in the examples and comparative examples were put on a model that could repeatedly urinate pseudo-urine at a predetermined speed and amount, and imitated a baby's body shape and weight, so that the body was lying on its back. In this posture, the body pressure applied to the absorber near the stomach becomes approximately 2.0 kPa. In this state, 40 ml of simulated urine was urinated, and the time until the simulated urine disappeared from the surface sheet was measured as the liquid absorption time. The measurement was performed 4 times at predetermined urination intervals. It means that the longer the liquid absorption time, the longer the simulated urine remains between the model and the surface sheet. The second, third, and fourth urinations were performed 5 minutes after the previous measurement.

[Liquid return amount]
Ten minutes after completion of the fourth urination of simulated urine, filter paper No. 1 manufactured by Advantech. 10 sheets of 4A cut into 10 cm × 10 cm are stacked and placed on a diaper near the urination section. A pressure of 3.43 kPa is applied from the top of the filter paper for 2 minutes to allow the filter paper to absorb the simulated urine. The weight of the filter paper is measured, and the increase in weight is taken as the liquid return amount.

  As is clear from the results shown in Table 1, it can be seen that the disposable diaper of the example is less likely to cause a decrease in the absorption rate even when the liquid is repeatedly absorbed as compared with the disposable diaper of the comparative example. Moreover, it turns out that the liquid return amount on the severe conditions of pressurization is also reduced with the absorber of an Example compared with the absorber of a comparative example.

Drawing 1 is a mimetic diagram showing the section of the thickness direction of the absorptive article of one embodiment (the 1st embodiment) of the present invention. FIG. 2 is a schematic diagram illustrating an example of an absorbent body manufacturing apparatus in the absorbent article illustrated in FIG. 1. FIG. 3 is a perspective view showing a configuration in the vicinity of the superabsorbent polymer inlet of the duct in the absorbent body manufacturing apparatus shown in FIG. 2. 4 is a vertical cross-sectional view (cross-sectional view taken along the line III-III in FIG. 2) showing a cross-section passing through the superabsorbent polymer inlet of the duct in the absorbent body manufacturing apparatus shown in FIG. 2. Drawing 5 is a mimetic diagram showing the section of the thickness direction of the absorptive article of a 2nd embodiment of the present invention. Drawing 6 is a mimetic diagram showing the section of the thickness direction of the absorptive article of a 3rd embodiment of the present invention. Drawing 7 is a mimetic diagram showing the section of the thickness direction of the absorptive article of a 4th embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Absorbent article 10 Absorber 11 Top sheet 12 Back sheet 13 Lower layer absorber 14 Upper layer absorber 15 Convex part 15
16 Liquid-permeable sheet 2 Pulp fiber 3 Super absorbent polymer (polymer particles)
DESCRIPTION OF SYMBOLS 20 Absorbent body manufacturing apparatus 30 Rotating drum 31 Space located on the back side of the bottom surface of the accumulation recess 40 Deposition for accumulation 41 Bottom surface 50 Duct

Claims (4)

A top sheet, a back sheet, and an absorbent body interposed between the two sheets, the absorbent body being an absorbent article containing pulp fibers and superabsorbent polymer particles,
In the surface sheet, the laminated upper layer sheet and lower layer sheet are partially joined to form a large number of joints, and other than the joints, a large number of convex portions are formed by the upper layer sheet, Between the upper layer sheet and the lower layer sheet in the convex portion is a cavity, the lower layer sheet is a three-dimensional sheet that is a planar sheet,
The absorber is formed by laminating an upper layer absorber and a lower layer absorber,
The average particle size of the superabsorbent polymer in the first surface of the upper absorbent body is greater than the average particle size of the superabsorbent polymer in the second surface of the upper layer absorbent body,
The weight of the pulp fiber on the second surface side is larger than the weight of the pulp fiber on the first surface side ,
The first surface is located on the top sheet side;
The lower layer absorber has an average particle size of the polymer particles on the first surface located on the upper layer absorber side larger than the average particle size of the polymer particles on the second surface located on the back sheet side, and An absorbent article in which the weight of the pulp fiber on the side of the surface is smaller than the weight of the pulp fiber on the second side . The average density of the superabsorbent polymer on the first surface of the absorber is larger than the average density of the superabsorbent polymer on the second surface, and the liquid passing rate at 2.0 kPa of the superabsorbent polymer is The absorbent article according to claim 1 , wherein the absorbent article is 20 ml / min or more. The absorbent article according to claim 1 or 2 , wherein the porosity of the first surface is larger than the porosity of the second surface. The absorptive article according to any one of claims 1 to 3 with which a second sheet is arranged between said absorber and said surface sheet.

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