JPH0465694B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention is applicable to disposable diapers, sanitary napkins,
The present invention relates to an absorbent body used in sanitary articles such as incontinence pads, and particularly relates to an absorbent body in which a special nonwoven fabric that has excellent directivity for body fluid diffusion and also has compression recovery properties is arranged as a support material for superabsorbent polymer particles. (Prior art) Cotton wood pulp is economical and flexible, and superabsorbent polymer particles have high absorption and retention properties and do not release absorbed moisture even under pressure. , used as an absorbent material in sanitary products. However, when the pulp is formed into a layer as an absorbent body, its shape retention is poor, and its fiber binding strength is weak and there is little capillary action, so crepe is used as a constituent material of the absorbent body. Compared to water-absorbing paper (paper cotton), it has poor body fluid diffusion properties. In addition, the polymer particles have poor body fluid diffusivity and permeability, making it impossible to utilize them effectively.Moreover, when they absorb body fluids and swell, they continuously come into contact with each other and form a barrier to body fluid permeation. There are some drawbacks when forming a . For this reason, the following techniques are known. (1) To eliminate the above-mentioned drawbacks of flocculent wood pulp,
Compressing and densifying the pulp layer in the presence or absence of water is disclosed in publications such as Utility Model Application Publication No. 143589/1989, US Pat. (2) In order to eliminate the above-mentioned drawbacks of superabsorbent polymer particles, it has been proposed in Japanese Patent Application Laid-Open No. 1983-1987 to bond the polymer particles to water-absorbing paper, non-woven fabric, etc. that have body fluid diffusing properties.
No. 4498, No. 54-141857, No. 54-158096, No. 4498, No. 54-141857, No. 54-158096, No.
It is disclosed in publications such as No. 56-60555. (3) In order to eliminate the above-mentioned drawbacks of superabsorbent polymer particles, cotton wood pulp is placed on both sides of the central layer in which the fiber web contains a mixture of cotton wood pulp and super absorbent polymer particles. Utility Model Publication No. 56-6096, which compresses the laminate as necessary.
Disclosed in No. 56-6097, No. 56-6098, etc. (4) In order to reduce the bulk of the absorbent body and impart high absorption retention, it is known that cotton-like wood pulp and powdered highly absorbent polymer particles are mixed and compressed, as disclosed in US Pat. No. 52-20692, No. 55-3632
This is disclosed in the issue. (5) In order to bond the superabsorbent polymer particles to a sheet or nonwoven fabric having body fluid diffusing properties, the polymer particles are made sticky in the presence of moisture;
The polymer particles are fixed to the sheet or nonwoven fabric by utilizing this adhesive property as described in Japanese Patent Application Laid-open No. 54
This is disclosed in publications such as No. -4498, No. 54-141857, and No. 59-135149. (6) In order to eliminate the above-mentioned drawbacks of superabsorbent polymer particles, the polymer particles are intermittently distributed and compressed in a fibrous web having compression resilience, and the compression is released by absorption of body fluids to form the polymer particles. According to the above-mentioned Japanese Patent Application Laid-open No. 59,
This is disclosed in publications such as No.-135149. (Problems to be Solved by the Invention) In particular, the techniques disclosed in (2), (3), and (6) above are effective in effectively utilizing superabsorbent polymer particles. It deserves better recognition. However, in the absorbent body according to the techniques (2) and (3) above, when water-absorbing paper is used as the body fluid-diffusing sheet that binds and supports superabsorbent polymer particles, the water-absorbing paper Because it has extremely low strength under wet conditions, it is easily deformed and damaged by the movement of the wearer's crotch, and cannot fulfill its function. However, body fluids generally do not have a directionality of body fluid diffusion, so body fluids diffuse in the vertical and horizontal directions. Such a tendency is undesirable in sanitary articles such as disposable diapers, sanitary napkins, and incontinence pads.
In this type of article, it is preferable to increase the dispersibility of body fluids in the vertical direction and reduce it in the lateral direction, thereby making effective use of the absorbent material and preventing leakage from the lateral direction. It is.
Even in the case of non-woven fabrics, this diffusion in the longitudinal direction may be improved to some extent by using parallel webs in the longitudinal direction as the constituent fibers.
This is inferior to crepe water-absorbing paper and the like, and therefore, when used as a support material for superabsorbent polymer particles, it cannot be used effectively. Furthermore, the absorbent body made of crepe water-absorbing paper or nonwoven fabric does not have compression recovery elasticity, so it does not increase in bulk when released from the compressed state. Therefore, there are drawbacks such as the inability to increase the body fluid retention volume, the inability to effectively utilize the superabsorbent polymer particles, and the lack of cushioning properties. In addition, in the absorbent body according to the technique (6) above, a body fluid diffusion layer made of a hydrophilic material whose density has been increased by compression is integrally formed in the structure described in (6) above. The diffusivity of the diffusion layer is not sufficient, and the fiber web supporting the superabsorbent polymer particles also has low diffusivity, so the effective use of the polymer particles is still unsatisfactory.Moreover, even if they are diffused, Since it has no such directionality, it has the disadvantage of the absorbers according to the techniques (2) and (3) above due to the lack of such directionality. In the present invention, this type of article has body fluid diffusion directionality comparable to that of crepe absorbent paper, which is known and used as a sheet with excellent body fluid diffusion properties, and also has compression recovery elasticity. It is an object of the present invention to effectively solve the above-mentioned problems by arranging a special nonwoven fabric having the following properties as a part of the absorbent body. (Means for Solving the Problems) The present invention for achieving the above object is based on an absorbent body for sanitary articles including a first layer, a second layer, and a third layer, and has the following points. Features. That is, the first layer includes a first fiber web in which hydrophobic fibers are bonded to each other, superabsorbent polymer particles intermittently distributed in the web, and 5 to 30% of the weight of the polymer particles. and hydrophilic fiber particles mixed with the polymer particles; the second layer is
It is formed by fiber entanglement of hydrophilic fibers, and has a vertical striped pattern in which high fiber density areas and low fiber density areas are alternately arranged in the width direction of the absorbent body, and has a density higher than that of the first fiber web. a second fibrous web that is tall and integrally coupled with the first fibrous web;
consisting of a fibrous web; the third layer is formed by frictionally engaging hydrophilic fiber particles and being in close contact with the first layer; the first layer, the second layer, and the third layer are , which are integrated by being compressed in the thickness direction in a laminated state. Further, the present invention will be explained based on illustrated examples as follows. FIG. 1 is a schematic cross-sectional view of an absorbent body as an example of the present invention in an uncompressed state, and FIG. 2 is a schematic enlarged cross-sectional view of a first layer and a second layer constituting the absorbent body of the present invention in an uncompressed state. It is. The absorber 1 has a first layer 2
, a second layer 3 , a third layer 4 , and a fourth layer 5 . However, although the fourth layer 5 is preferably present in the present invention, it is not an essential component. Further, on the surfaces of the third layer 4 and the fourth layer 5, there is a carrier sheet 6 used when forming these layers as described later, and these sheets are also essential in the present invention. It is not a constituent element. The first layer 2 includes a relatively low-density first fiber web 7 in which hydrophobic fibers are bonded together by fusion, adhesion, or entanglement, and superabsorbent polymer particles intermittently distributed in the web. 8 and hydrophilic fiber particles 9 mixed between the polymer particles.
These particles 8 and 9 will be described in more detail later, but
It is fixed between the fibers of the first fibrous web 7 so as to be wrapped, so to speak, by the fibers that are combined. As a hydrophobic fiber, it has the required compression recovery elasticity,
Staple fibers are used that retain their properties even when wet, so that they do not lose their elasticity. The most preferred are polyester fibers, and in addition, polypropylene, polyethylene, polyamide, acrylonitrile fibers, and polyester fibers whose surfaces are hydrophilic and whose cores are hydrophobic can also be used. The first fibrous web made of such fibers must have a weight of 10 to 150 in order to have a volume that supports a predetermined amount of superabsorbent polymer particles 8 in a desirable state and a predetermined compression recovery elasticity.
g/m ² , density 0.006 to 0.05 g/cm ³ , and fineness 3 to 12 d. As the superabsorbent polymer particles 8, for example,
Examples include starch-based, cellulose-based, and synthetic polymer-based. Namely, starch-acrylic acid (salt) graft copolymer, starch-ethyl acrylate graft copolymer saponified product, starch-
Saponified product of methyl methacrylate graft copolymer,
Saponified product of starch-acrylonitrile graft copolymer, saponified product of starch-acrylamide graft copolymer, saponified product of starch-acrylonitrile-2-acrylamide-2-methylpropanesulfonic acid graft copolymer, starch-
Crosslinked products of saponified acrylonitrile-vinyl sulfonic acid graft copolymer, acrylic acid (salt)
These include polymers, saponified products of methyl methacrylate-vinyl acetate copolymers, polyethylene oxide cross-linked with acrylic acid, cross-linked products of sodium carboxymethyl cellulose, and cross-linked products of polyvinyl alcohol-maleic anhydride reaction products. Such superabsorbent polymer particles 8 have an absorption and retention capacity of 20 times or more of their own weight, and have the property of being water-insoluble and swelling and gelling when absorbing a large amount of water. Such particles 8 must have a weight of 30 to 800 g/m ² , preferably 100 to
400g/m ² , particle size 50~1000μ, preferably 100~
500μ is used. The hydrophilic fiber particles 9 may be cotton-like pulp obtained by crushing a wood pulp sheet or rayon fibers alone or in combination, with the former being preferred.
In addition, polyester fibers having a hydrophilic surface and a hydrophobic core may also be used. This particle 9 is
The fiber length is 5 mm or less, and 5 to 30% of the weight of the polymer particles 8 is used. This particle 9
The reason why is used is to eliminate spaces in the first layer 2 that would be an obstacle to body fluid transfer, as will be described later, and to prevent the polymer particles 8 from coming into contact with each other when they swell and forming a barrier to body fluid permeation. If it is less than 5%, the desired effect cannot be obtained, and if it is more than 30%, a predetermined amount of the polymer particles 8 cannot be supported by the first fiber web, so that the desired effect cannot be obtained. Body fluid absorption and retention capacity cannot be obtained. The second layer 3 is composed of a relatively high-density second fiber web in which hydrophilic fibers are bonded to each other, and is integrally bonded to the relatively low-density first fiber web 7,
In other words, it constitutes a composite nonwoven fabric. This combination is
The fibers are welded together by heat treatment, bonded by binder treatment, or entangled by high-speed water jet or needle treatment. Stable fibers that permeate and diffuse body fluids are used as such hydrophilic fibers. The most preferable fiber is rayon fiber, and polyester fiber whose surface is hydrophilic and whose core is hydrophobic may also be used. In the second layer 3 made of such fibers, that is, the second fiber web, the fibers are bonded by any of the above-mentioned welding, adhesion, and entanglement, but
In terms of body fluid diffusivity, it is most preferable that the fibers are intertwined and bonded by the high-speed water jet treatment. Web (non-woven fabric) obtained through this process
As illustrated in the schematic enlarged view in FIG. 3, the fiber has a vertical striped pattern in which high-density parts 10 and low-density parts 11 are arranged alternately in the horizontal direction, and the fibers are intertwined with each other in a three-dimensional direction. The pattern is used in the vertical direction of the absorbent body 1. Such non-woven fabrics are disclosed in Japanese Unexamined Patent Application Publication No. 1983-1999 filed by the present applicant.
No. 71853, No. 57-3926, etc., in which a fibrous web is guided onto a support and ejected from orifices placed at predetermined intervals across the width of the web. Obtained by a water treatment method. The third layer 4 and the fourth layer 5 are formed by friction bonding of hydrophilic fiber particles with a fiber length of 5 mm or less, and the former forms the first layer 2.
and the latter are in close contact with the second layer 3, respectively. Examples of the hydrophilic fiber particles include cotton-like pulp and rayon fiber obtained by mechanically defibrating wood pulp, and the former is preferably used. The total weight of the third layer 4 and the fourth layer 5 is 200 to 600 g/m ² , and the ratio of the former is ≦the latter, but the former is preferably 80 to 300 g/m ² . As illustrated in FIG. 4, the first layer 2, second layer 3, third layer 4, and fourth layer 5 as described above are integrated by compression in the thickness direction in their laminated state. . As illustrated in FIGS. 4, 5, and 7, this compression is achieved by forming first grooves 12 that extend a predetermined length in the longitudinal direction of the absorbent body 1 and have a predetermined interval in the lateral direction; It is preferable that the embossing is formed on the upper surface of the absorbent body 1 with a second groove groove 13 that is thinner, shallower, and shorter than the second groove groove 13 and is oriented in a direction that intersects with these grooves. Under such a compressed state, the spacing between the superabsorbent polymer particles becomes narrower than when uncompressed, but the amount of superabsorbent polymer particles is distributed intermittently to the extent that they do not interfere with each other during absorption and expansion. There is. The absorbent body 1 as described above is manufactured, for example, by the following method. The first fiber web 7 of the first layer 2 is a composite nonwoven fabric.
and the second fiber web of the second layer 3 is manufactured in advance. In its production, the fibers of the first fibrous web 7 and the second fibrous web 3 are bonded by welding by heat treatment, adhesion by binder treatment, entanglement by high-speed water jet treatment or needle treatment to form the respective webs 7 and 3. After forming the
The two may be overlapped and integrated by any of the above-mentioned bonding methods, or the two without bonding fibers may be overlapped and integrated by any of the above-mentioned bonding methods. The first fibrous web 7 and the second fibrous web 3 thus combined and integrated are moved by a mesh conveyor that moves the first fibrous web 7 in the horizontal direction with the first fibrous web 7 facing upward. While spraying superabsorbent polymer particles 8 prepared in advance from above,
Hydrophilic fibers obtained by spraying 60 g/m ² of water to moisten the surface of superabsorbent polymer particles 8, supporting the upper surface with a carrier sheet 6, and defibrating the pulp sheet with garnet or the like. A third layer 4 made of particles is laminated, air is applied by a vacuum device placed below the second fiber web 3, and if necessary, the hydrophilic fibers are supported by a carrier sheet 6 and The other fourth layer 5 made of the same material as the particles is placed on the lower surface of the second layer 3, and the thus laminated absorbent body 1 has grooves 12 formed by an embossing roll on its surface and grooves formed by a wire mesh. Emboss is applied so that 13 appears. At that time, water may be sprayed as necessary, and the grooves 12 and 13 may be formed on the back surface of the absorbent body 1. Concave groove 12 has a pressure of 2 to 15 kg/
cm ² , and the grooves 13 are preferably formed at a pressure of 1 to 8 kg/cm ² . What should be noted here is that, first, the superabsorbent polymer particles 8 are infiltrated and distributed in the first fiber web 7 due to the suction action, and at the same time, the third layer 4
A part of the hydrophilic fiber particles forming the first fiber web 7 (a part of the particles located on the lower surface of the third layer)
In other words, it is intermixed between the polymer particles 8. The amount of hydrophilic fiber particles penetrating into the first fiber web 7 varies depending on the density, fineness, the suction force, etc. of the first fiber web 7, but in specifying those conditions described above, the weight described above, i.e. , 5 to 30% of the weight of the polymer particles 8. However, in order to mix a predetermined amount of hydrophilic fiber particles in the polymer particles 8 in this way, the former may be mixed with the latter in advance and then dispersed as described above. Second, the wetted polymer particles 8 become sticky, and hydrogen bonds occur in the hydrophilic fiber particles, and furthermore,
Since the first layer 2 is compressed by the compression process,
This means that the compressed state is fixed and will not be released even when dry. Thirdly, the third layer 4 (and also the fourth layer 5, if arranged) is endowed with a predetermined body fluid diffusion directionality and capillary action by said compression. Furthermore, in order to distribute the polymer particles 8 on the first fiber web 7, as described above, the polymer particles 8 are scattered from above the first fiber web 7, and
When adopting a method of infiltrating the polymer particles 8 into the first fibrous web 7 by causing suction air to act below the second fibrous web 3, the weight of the first fibrous web 7 and the second fibrous web 3 (g/m ² ), density (g/cm ³ ), fineness (d), weight (g/m ² ), and particle size (μ) of the polymer particles 8 are the specific values described above for the first fiber web of the polymer particles 8. 7 to facilitate a substantially uniform penetration distribution to the second fibrous web 3 and to enhance fixation, the polymer particles 8
This is preferable in that it prevents the passage of Although not shown, the third layer 4 and the fourth layer 5 have grooves 12 and 1 formed by the embossing process.
In addition to or in place of 3, a large number of slits in an appropriate pattern such as minus (-) or plus (+) may be provided under a predetermined pressure. This not only provides the same effect as the embossing, but also has the advantage of improving the permeability of body fluids and reducing the stiffness of the absorbent body 1 due to compression. The absorbent body 1 having the above-described structure and obtained by the manufacturing method is used for sanitary articles such as disposable diapers 14 and sanitary napkins 15, as shown in FIGS. 8 and 9. The diaper 14 is produced by joining a water-permeable top sheet 16 such as a non-woven fabric and a water-impermeable back sheet 17 such as a plastic film to each other with the absorber 1 interposed between the outer peripheral parts of the front and back sheets. It is configured. The napkin 15 is constructed by placing a water-impermeable sheet 18 such as a plastic film from the bottom surface of the absorbent core 1 to both side surfaces thereof, and surrounding the entirety with a water-permeable sheet 19. In addition, when the absorbent body 1 is used for these sanitary articles, a plurality of the absorbent bodies may be laminated or used in combination with other absorbent materials, if necessary. (Function) The absorbent body 1 is placed inside the sanitary article so that the third layer 4 is located on the wearer's skin side. The body fluid that came into contact with the third layer 4 is diffused in the surface direction by the compression grooves 12 and 13, and a part of it is absorbed and retained in the third layer 4, and the rest permeates in the layer direction and is absorbed into the first layer. 2
guided by. In the first layer 2, body fluids are mainly absorbed and retained by the superabsorbent polymer particles 8,
In addition, the absorption causes the polymer particles 8 to expand, and this expansion, the adhesion of the polymer particles 8 to the first fiber web 7, and the decrease in hydrogen bonding of the hydrophilic fiber particles 9 when they come into contact with a relatively large amount of body fluid. Due to the release, the compressed state of the first fibrous web 7 is released, so that the first fibrous web 7 restores its original shape and increases in volume and volume, thereby creating a space in which the polymer particles 8 can sufficiently expand. At the same time, the remaining body fluids that are not absorbed and retained by the polymer particles 8 are
It is guided to the second layer 3 by the fibers of the first fiber web 7 and the hydrophilic fiber particles 9. In the second layer 3, body fluid is diffused in the plane direction, particularly in the vertical direction, and is absorbed and retained by the polymer particles 8 again. Furthermore, there is residual body fluid that is not absorbed and retained by the polymer particles 8;
In addition, when the fourth layer 5 is disposed, body fluids permeate through the second layer 3 and are absorbed and retained by the fourth layer 5. Note that, as mentioned above, the absorber 1 usually has a third
Layer 4 is arranged inside the sanitary article so that it is located on the wearer's skin side, but if a fourth layer 5 is arranged, it is arranged so that the fourth layer 5 is located on the wearer's skin side. In this case, it is preferable that the fourth layer 5 is also provided with compressed grooves 12 and 13. (Example) As shown in the following table. However, the fibers of the second fibrous web were entangled by high-speed water jet treatment, and the first fibrous web was superimposed on the second fibrous web and entangled and integrated by needle treatment. The first fibrous web was sprayed with 40 g/m ² of water after being sprinkled with polymer particles. Polymer particles are manufactured by Sanyo Chemical Co., Ltd. 1M2000, 200
~800μ was used. The third and fourth layers are made of cotton-like wood pulp, and their surfaces are embossed like the compressed grooves 12 and 13 in the illustrated example, and the former embossing is 5 kg/m ² , the latter was 2Kg/ ^m2 . Approximately 10% of the weight of the polymer particles was found to be cotton-like wood pulp mixed in the first layer. (1) Examples 1 to 4 show those in which the density of the first fiber web was changed. In Example 1, too many voids were formed in the first fiber web, and the fixation of the polymer particles was poor. In Example 4, an appropriate amount of voids were not formed in the first fiber web, and the polymer particles were not sufficiently expanded. In Examples 2 and 3,
There were no defects like those in Examples 1 and 4, and the expected effects were observed. (2) Examples 5 to 8 show those in which the weight of the first fiber web was changed. In Example 5, the amount of fibers to fix an appropriate amount of polymer particles to the first fiber web was insufficient, and the fixation could not be performed sufficiently. In Example 8, no voids were formed when an appropriate amount of polymer particles 8 were fixed on the first fiber web, and body fluid retention was poor. In Examples 6 and 7, there were no defects like Examples 5 and 8, and the expected effects were observed. (3) Examples 9 to 12 show those in which the fineness of the first fiber web was changed. In Example 9, the fibers of the first fiber web were weak and did not exhibit compression recovery properties. In Example 12, the stiffness and compression recovery properties were sufficient, and no further fineness was required. In Examples 10 and 11, there were no defects like in Example 9, and the expected effects were observed. (4) Examples 13 to 16 show changes in the density of the second fiber web, and Examples 17 to 20 show changes in the weight. In Examples 13 and 17, the body fluid diffusivity was low. In Examples 16 and 20, the diffusivity was high, but higher density and weight were unnecessary. Examples 14, 15, 18, and 19 did not have the drawbacks of Examples 13 and 17, and the expected effects were observed. (5) Examples 21 to 24 show different weights of polymer particles. In Example 21, the desired amount of absorption and retention could not be obtained. In Example 24,
Although the amount of absorption and retention was almost good, there was no space for the polymer particles to expand sufficiently, so that their effective use could not be recognized. In Examples 22 and 23, there were no defects like Examples 21 and 24, and the expected effects were observed.

[Table] (Effects of the Invention) According to the present invention, since it has the above-mentioned configuration and operation, it has the following effects. (1) The first fiber web 7, which is maintained in a compressed state by fixing the polymer particles 8, is hydrophobic and has a desired stiffness, and when it comes into contact with a relatively large amount of body fluid, it is released from its compressed state and loses its bulk. This increases the body fluid retention volume, thereby creating a void in which the polymer particles 8 can expand sufficiently without interfering with each other.As a result, body fluids are sufficiently absorbed and retained by the polymer particles 8, and the polymer particles 8 Effective utilization increases significantly. (2) The second fibrous web 3 integrally combined with the first fibrous web 7 has hydrophilic properties and has a desired density, in particular, areas with high fiber density and areas with low fiber density are arranged alternately in the width direction of the absorbent body. It has an array of vertical stripes and is excellent in the directionality of body fluid diffusion in the longitudinal direction of the absorber. Therefore, the body fluid is sufficiently distributed to the polymer particles 8, and the effective utilization of the polymer particles 8 is further increased. (3) Since a predetermined percentage of the weight of the polymer particles 8 is intermixed in the first layer 2, the required expansion space of the polymer particles 8 is not reduced; It reduces the formation of an inappropriate amount of voids that impede the transfer of body fluids, and as a result, improves the transfer of body fluids, especially the transfer to the second layer (fibrous web) 3, and makes effective use of the polymer particles 8. Contribute. (4) Due to (1) to (3) above, the amount of body fluid absorbed per unit area of the absorbent body 1 is reduced, so the backflow and seepage of body fluid to the surface is significantly reduced, and especially from the lateral direction. (5) Furthermore, since the second fiber web 3 has excellent shape retention, it also compresses the entire absorbent body 1 and retains its shape even when the absorbent body 1 is wet. Effectively prevents deformation. Moreover, since it is integrally bonded to the first fiber web 7, there is no possibility of partial delamination that would impede capillary action between the first fiber web 7 and the first fiber web 7, thereby further enhancing the diffusion effect of the body fluid.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway schematic cross-sectional view of an uncompressed absorbent body according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view with a portion of the first and second layers of the absorbent body cut away. FIG. 3 is a schematic enlarged plan view with a part of the second layer cut away. FIG. 4 is a schematic cross-sectional view of a state in which a part of the absorbent body is cut out to form compressed first grooves.
Figure 5 shows a part of the absorbent body cut out and further compressed.
FIG. 3 is a schematic cross-sectional view of a state in which grooves are formed. FIG. 6 is a partially cutaway perspective view of the absorbent body in an uncompressed state. 7th
Figures A and B are partially cutaway plan views illustrating first and second grooves on the surface of the absorbent body, respectively. 8th
Figure A is a partially cutaway plan view of a diaper to which an absorbent body is applied. FIG. 8B is a sectional view taken along line XX in FIG.
FIG. 9A is a plan view of a napkin to which an absorbent material is applied. FIG. 9B is a sectional view taken along the line XX in FIG. 1... Absorbent body, 2... First layer, 3... Second layer (second fiber web), 4... Third layer, 5... Fourth layer, 7... First
Fiber web, 8...polymer particles, 9... fiber particles,
10... High density portion, 11... Low density portion, 12... First groove, 13... Second groove.

Claims (1)

[Claims] 1 An absorbent body in a sanitary article comprising a first layer, a second layer, and a third layer; the first layer comprises a first fibrous web in which hydrophobic fibers are bonded to each other; It consists of superabsorbent polymer particles that are intermittently distributed therein, and hydrophilic fiber particles that are mixed in the polymer particles in an amount of 5 to 30% of the weight of the polymer particles;
The second layer is formed by fiber entanglement of hydrophilic fibers, and is provided with a vertical striped pattern in which high fiber density portions and low fiber density portions are alternately arranged in the width direction of the absorbent body. The third layer consists of a second fibrous web that has a higher density than the fibrous web and is integrally bonded to the first fibrous web; the third layer has hydrophilic fiber particles frictionally bonded and is in close contact with the first layer. The absorbent body in the sanitary article, wherein the first layer, the second layer, and the third layer are integrated by compression in the thickness direction in a laminated state.