JP2013252333A - Absorbing body and absorbing article with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbing body in which measures against gel block is taken while keeping an absorbing speed of body fluid at a high speed and to provide an absorbing article with the same.SOLUTION: An absorbing body 1 has an absorbing core 2 having liquid absorbability and a core wrap sheet 4 covering the absorbing core 2. The absorbing core 2 contains a fiber layer 5 having thermoplastic fiber and highly absorbable polymer particle 6 arranged dispersed in the fiber layer 5 and having an absorbing speed by a Vortex method of 25 sec or less. The highly absorbable particle 6 includes first particles 6A arranged in a skin side face and second particles 6B arranged in a cloth side having a particle size smaller than that of the first particle 6A.

Description

  The present invention relates to an absorber. More specifically, the present invention relates to an absorbent body that can be suitably used for absorbent articles such as disposable diapers and sanitary napkins, and an absorbent article including the same.

Conventionally, in absorbent articles such as disposable diapers and sanitary napkins, an absorbent body composed of a hydrophilic fiber material such as pulp and superabsorbent polymer particles dispersed in the hydrophilic fiber material is used. In such an absorbent body, liquid such as urine and menstrual blood excreted from a wearer wearing the absorbent article is first absorbed by the hydrophilic fiber material having a high absorption rate, and then into the highly absorbent polymer particles. Absorbed.
In addition, the absorber includes a fiber layer composed of a thermoplastic fiber layer and superabsorbent polymer particles dispersed and arranged in the fiber layer, and the content of the superabsorbent polymer particles is increased. Thus, a technique for keeping the liquid absorbency high while reducing the thickness of the absorber has also been proposed (see, for example, Patent Document 1).

JP-A-10-118113

  However, when the content of the superabsorbent polymer particles is increased, a gel block that coalesces between the swollen superabsorbent polymer particles is generated when the body fluid is absorbed. On the other hand, if the content of the superabsorbent polymer particles is reduced in order to avoid gel block, the absorption rate of the body fluid is decreased.

  An object of the present invention is to provide an absorbent body in which a measure against gel block is taken and an absorbent article including the same while keeping the absorption speed of bodily fluids high.

  The present invention is an absorbent body for an absorbent article comprising an absorbent core having liquid absorbability and a core wrap sheet covering the absorbent core, wherein the absorbent core has thermoplastic fibers. A fiber layer; and a superabsorbent polymer particle dispersed and disposed in the fiber layer, wherein the superabsorbent polymer particle is disposed on the side surface of the clothing and the first particle disposed on the skin side surface. Second particles having a particle size larger than that of the first particles, the first particles have an absorption rate of 22 seconds or less by the Vortex method, and the second particles have an absorption rate of 22 seconds or less by the Vortex method. It is related with the absorber for absorbent articles characterized by being 25 seconds or less.

  The absorption rate of the first particles by the Vortex method is preferably smaller than the absorption rate of the second particles by the Vortex method.

  The first particles preferably have an absorption rate by the Vortex method of 22 seconds or less, and the second particles have an absorption rate by the Vortex method of greater than 22 seconds and 25 seconds or less.

  The ratio of the absorption rate of the first particles by the Vortex method to the absorption rate of the second particles by the Vortex method is preferably in the range of 1.0 to 1.5.

  The first particles preferably have a particle size of 350 μm to 850 μm, and the second particles preferably have a particle size of 150 μm to 450 μm.

  It is preferable that a hydrophilic fiber sheet is included on the clothing side of the absorbent core.

  In the core wrap sheet, it is preferable that the basis weight of the portion disposed on the skin side surface of the absorbent core is smaller than the portion disposed on the clothing side surface of the absorbent core.

  In the core wrap sheet, it is preferable that the number of portions disposed on the clothing side surface of the absorbent core is greater than the number of portions disposed on the skin side surface of the absorbent core.

  The basis weight of the first particles in the region where the first particles are disposed in the absorbent core is smaller than the basis weight of the second particles in the region where the second particles are disposed. Are preferred.

  The present invention also includes a liquid-permeable top sheet, a liquid-impermeable back sheet, and the above-described absorbent core interposed between the liquid-permeable top sheet and the liquid-impermeable back sheet. And an absorbent article comprising a front waistline region, a back waistline region, and a crotch region located between the two regions along the longitudinal direction, and the crotch region includes a width direction side thereof. A pair of liquid-proof cuffs standing on the edge side from the absorbent core when the absorbent article is worn are provided, and each of the liquid-proof cuffs shrinks when worn and causes the liquid-proof cuff to stand. The liquid member extending from the portion of the liquid-proof cuff attached to the liquid-permeable surface sheet to the inner side of the elastic member disposed on the outermost side in the width direction among the elastic members. A permeable film. About sex articles.

  According to the present invention, it is possible to provide an absorbent body that is unlikely to cause liquid leakage even when a gel block is generated on the surface, and an absorbent article including the same, while maintaining a high body fluid absorption speed.

It is sectional drawing of the absorber of this invention used for absorbent articles, such as the disposable diaper and sanitary napkin concerning 1st Embodiment of this invention. It is sectional drawing of the absorber of this invention used for absorbent articles, such as the disposable diaper and sanitary napkin concerning 2nd Embodiment of this invention. It is sectional drawing of the absorber of this invention used for absorbent articles, such as a disposable diaper and sanitary napkin concerning 3rd Embodiment of this invention. It is sectional drawing of the absorber of this invention used for absorbent articles, such as the disposable diaper and sanitary napkin concerning 4th Embodiment of this invention. It is 5th Embodiment of this invention, and is an expanded view of the disposable diaper using the absorber of 1st Embodiment. It is the XX sectional view taken on the line of Drawing 5 when putting a diaper into a wearing state.

(First embodiment)
Hereinafter, the absorber 1 of 1st Embodiment of this invention is demonstrated.
FIG. 1 is a cross-sectional view of an absorbent body 1 used for absorbent articles such as disposable diapers and sanitary napkins described later.
As illustrated, the absorbent body 1 includes an absorbent core 2, a fiber sheet 3 disposed on the clothing side of the absorbent core 2, and a core wrap sheet 4 that covers the absorbent core 2 and the fiber sheet 3. It is a thin sheet body provided.
The absorbent core 2 is obtained by dispersing superabsorbent polymer particles 6 in a fiber layer 5 made of thermoplastic fibers. The absorptive core 2 has a skin side surface 2A that is the side facing the skin (side that contacts the skin) and a clothing side surface 2B that is the side facing the clothing (side that contacts the clothing).

The fiber layer 5 has a three-dimensional network structure formed by heat-bonding a part of thermoplastic fibers. As the thermoplastic fiber constituting the fiber layer 5, one having a fineness of 0.5 dtex to 10 dtex is preferably used. Further, from the viewpoint of improving the water absorption of the fiber layer 5, it is preferable that the thermoplastic fiber is subjected to a hydrophilic treatment. Moreover, it is preferable that the basic weight of the whole fiber contained in the fiber layer 5 is 20 g-100 g / m < ² >, and the apparent density of the fiber layer 5 is 0.01 g-0.05 g / cm < ³ >. preferable.

As the thermoplastic fiber constituting the fiber layer 5, a seascore type composite fiber having a sheath portion made of a low melting point component and a core portion made of a high melting point component is subjected to a hydrophilization treatment and further subjected to a mechanical crimping process. And side-by-side latent crimpable fibers composed of two resin components having different heat shrinkage rates.

The superabsorbent polymer particles 6 are dispersed and arranged in the fiber layer 5. As the superabsorbent polymer particles 6, those having a water retention of at least 20 g / g are preferably used.
The superabsorbent polymer particles 6 are piled together with the thermoplastic fiber and dispersedly arranged in the thermoplastic fiber. Then, the fiber layer 5 is formed by thermally fusing the thermoplastic fiber, and the superabsorbent polymer particles 6 are dispersedly arranged in the fiber layer 5.

  The absorbent core 2 of the first embodiment is formed by 40 wt% to 5 wt% thermoplastic fibers and 60 wt% to 95 wt% superabsorbent polymer particles.

The superabsorbent polymer particles 6 used in the present invention have a high absorption rate of 25 seconds or less according to the Vortex method according to JIS K 7224. In the present embodiment, the superabsorbent polymer particles 6 include first particles 6A present on the skin side surface 2A side of the absorbent core 2, and second particles 6B present on the clothing side surface 2B side of the absorbent core 2. including. And among the superabsorbent polymer particles 6, the particle diameter of the first particles 6A existing on the skin side surface 2A side of the absorbent core 2 is the same as that of the second particles 6B existing on the clothing side surface 2B side of the absorbent core 2. Smaller than particle size.
Specifically, the particle diameter of the first particles are 350Myuemu～850myuemu, it is preferred particle size of the second particles is 1 50Myuemu～450myuemu.

“The particle size of the first particles 6A existing on the skin side surface 2A side” is, for example, a value obtained by taking a photograph of the absorbent core 2 from the skin side surface 2A and measuring the diameter of the particles in the photographed photo. It is. For example, the average particle diameter of particles in a unit area such as 10 square centimeters in the absorbent core 2 is measured.
“The particle size of the second particles 6B existing on the side of the clothing side 2B” is also a value obtained by, for example, taking a photograph of the absorbent core 2 from the clothing side 2B, measuring the diameter of the particles in the photographed photo, and averaging is there. For example, the average particle diameter of particles in a unit area such as 10 square centimeters in the absorbent core 2 is measured.

  Further, the absorption rate of the first particles 6A by the Vortex method is higher than the absorption rate of the second particles 6B by the Vortex method. Specifically, the first particle 6A has an absorption rate by the Vortex method of 22 seconds or less, and the second particle 6B has an absorption rate by the Vortex method of greater than 22 seconds and 25 seconds or less. That is, in the absorbent core 2, the body side absorbs body fluid faster than the clothing side. The ratio of the absorption rate of the first particles by the Vortex method to the absorption rate of the first particles by the Vortex method is preferably in the range of 1.0 to 1.5.

  The absorption rate by the Vortex method is represented by the time required for 2.0 g of the superabsorbent polymer particles 6 to absorb 50 g of 0.9% physiological saline. The water retention rate of the superabsorbent polymer particles 6 is obtained by immersing 1 g of superabsorbent polymer particles 6 in 1 l of 0.9% physiological saline for 1 hour, draining for 15 minutes, and then centrifuging at 850 rpm for 90 seconds. Represented by the weight of

  Moreover, although the shape of the superabsorbent polymer particle 6 shown as an example in FIG. 1 is a spherical shape with a smooth surface, it is not limited thereto, and for example, the surface of the superabsorbent polymer particle may be uneven. If the surface is uneven, the superabsorbent polymer particles 6 are easily caught on the fiber layer 5 and are less likely to fall off the absorbent core 2, and the surface area is relatively large, so that the absorption rate is also improved. Further, the superabsorbent polymer particles 6 may not be spherical but may be an ellipse, a cube, a cone, or the like. When the particles are not spherical as described above, the photograph is taken as described above, the area of the photographed particles is measured, and the diameter of the first particle and the second particle is determined by the diameter of a circle having the same area as that area. Find the average diameter.

The superabsorbent polymer particles 6 in the region between the skin side surface 2A side and the clothing side surface 2B of the absorbent core 2 gradually increase in particle size from the skin side surface 2A toward the clothing side surface 2B. You may change so that an absorption rate may become long gradually.
Further, when the absorbent core 2 is divided into two in the thickness direction (direction between the skin side surface 2A and the clothing side surface 2B), the average of the entire superabsorbent polymer particles in the skin side region, which is one of them, is as described above. The average diameter and absorption rate of the first particle 6A may be the same as those of the second particle 6B described above.

The fiber sheet 3 is a hydrophilic fiber sheet containing pulverized pulp, for example. The fiber sheet 3 is preliminarily disposed in order to absorb body fluid when a large amount of body fluid flows into the absorbent core 2 or the like.
The core wrap sheet 4 covers the upper surface (skin side surface), the lower surface (clothing side surface) and the side surface of the absorbent core 2. The core wrap sheet 4 is composed of a sheet having liquid permeability such as tissue paper.

In the absorbent body 1 of the present embodiment, when body fluid such as urine is absorbed from the skin side surface 2A, the body fluid first passes through the region where the first particles 6A are disposed. At this time, since the particle diameter of the first particles 6A is small, the gap formed between the first particles 6A is reduced, and the body fluid present in the liquid permeable sheet disposed on the skin side surface 2A side is absorbed by the absorbent core 2. It becomes possible to pull in to the side. Thereby, the quantity of the bodily fluid return to a wearer's skin can be reduced.
Here, for example, when the basis weight is the same, comparing the region where the first particles 6A are present and the region where the second particles 6B are present, the region where the first particles 6A are present has a smaller particle size. Therefore, the surface area per unit volume is large. Therefore, the first particle 6A having a small particle diameter can improve the contact probability with the body fluid remaining between the constituent fibers of the fiber layer 5 located on the skin side surface 2A side. Therefore, since the body fluid can be efficiently taken into the superabsorbent polymer particles on the skin side surface 2A side, the amount of body fluid returning to the wearer's skin can be further reduced.
Moreover, since the particle diameter of 6 A of 1st particle | grains is small, the foreign material feeling (graininess) to a wearer's skin can be suppressed and the touch can be improved.

  In addition, the first particles 6A absorb the body fluid more quickly because the absorption speed by the Vortex method is as short as 22 seconds or less. Thereby, the quantity of the bodily fluid return to a wearer's skin can further be reduced. In this case, when the body fluid flows in, the fluid is instantaneously absorbed by the first particles 6A on the surface. However, if a large amount of body fluid flows and exceeds the allowable amount, the first particles 6A may partially cause a gel block. Gel block is a phenomenon of coalescence between swollen superabsorbent polymer particles.

When the gel block is generated and the body fluid further flows, the body fluid spreads from the portion where the gel block on the surface of the absorbent core 2 is generated to flow to the portion where the gel block is not generated. And it is absorbed by the 1st particle | grains 6A of the part, or flows downward (clothing side) and flows in between 2nd particle | grains 6B.
The second particles 6B have a small surface area per unit volume of particles that absorb the body fluid, and the absorption rate is greater than 22 seconds and not greater than 25 seconds.
That is, in the second particle 6B, the body fluid that has not been absorbed by the first particle 6A is absorbed over a specific time, and the body fluid is retained by the second particle 6B.
When the body fluid is further large and cannot be held by the second particles 6B, the remaining body fluid is absorbed by the fiber sheet 3 disposed in the lower layer (clothing side) of the absorbent core 2.

Moreover, when a bodily fluid flows out to the side surface of the absorptive core 2 by the gel block produced in the area | region where the 1st particle | grains 6A exist, the inflow to the outside is prevented by the core wrap sheet | seat 4 of the bodily fluid.
Moreover, the body fluid absorbed by the side surface of the core wrap sheet 4 flows through the core wrap sheet 4 to the clothing side of the lower core wrap sheet 4 and can be held on the clothing side.
The core wrap sheet 4 can absorb not only body fluid flowing through the side portions but also body fluid leaked from the fiber sheet 3 and could not be absorbed by the fiber sheet 3.

  In addition, when the ratio of the absorption rate by the Vortex method of the first particle 6A to the absorption rate by the Vortex method of the second particle 6B exceeds 1.5, the absorption of the second particle 6B arranged on the clothing side surface 2B side Since the speed is reduced, the body fluid that diffuses on the skin side surface 2A side and moves to the clothing surface 2B side further moves to the back surface side, making it difficult to efficiently absorb body fluid throughout the thickness direction TD of the absorbent core 2. End up. In addition, body fluid diffuses in the lowermost layer on the back side, and there is a concern about leakage.

(Second Embodiment)
FIG. 2 is a view showing an absorbent body 1A according to the second embodiment of the present invention. The absorbent body 1A of the second embodiment is the same as the absorbent body 1 of the first embodiment except for the clothing side of the core wrap sheet 4A. Similar parts are denoted by the same reference numerals, and description thereof is omitted.
In the core wrap sheet 4 </ b> A of the second embodiment, the basis weight of the portion covering the clothing side surface of the absorbent core 2 is larger than the basis weight of the portion covering the skin side surface of the absorbent core 2.

According to this embodiment, although it has the same effect as 1st Embodiment, since the core wrap sheet | seat 4 arrange | positioned at the clothing side has a large basic weight, it can absorb more bodily fluids.
Therefore, the body fluid that has flowed out to the absorbent core 2 by the gel block flows along the side surface of the core wrap sheet 4 to the layer on the clothing side, and is reliably held by the clothing side of the core wrap sheet 4.

(Third embodiment)
FIG. 3 is a view showing an absorbent body 1B according to a third embodiment of the present invention. The absorbent body 1B of the third embodiment is the same as the absorbent body 1 of the first embodiment except for the clothing side of the core wrap sheet 4B. Similar parts are denoted by the same reference numerals, and description thereof is omitted.
As shown in FIG. 1, the core wrap sheet 4B of the second embodiment covers the clothing side surface of the absorbent core 2, extends one side surface of the absorbent core 2, covers the skin side surface of the absorbent core 2, The other side surface of the absorbent core 2 extends and covers the clothing side surface of the absorbent core 2 again. That is, the core wrap sheet 4 is doubled on the clothing side surface of the absorbent core 2.

According to this embodiment, although it has the same effect as 1st Embodiment, since the core wrap sheet | seat 4 arrange | positioned at the clothing side is double, it can absorb more bodily fluids.
Therefore, the body fluid that has flowed out to the absorbent core 2 by the gel block flows along the side surface of the core wrap sheet 4 to the layer on the clothing side, and is reliably held by the clothing side of the core wrap sheet 4.
In addition, although this embodiment demonstrated the case where the core wrap sheet | seat arrange | positioned at the clothing side was double, it is not limited to this, Multiple more than triple may be sufficient.

(Fourth embodiment)
FIG. 4 is a view showing an absorbent body 1C according to a fourth embodiment of the present invention. The absorbent core 2 of the fourth embodiment is different from the absorbent core 2 of the first embodiment in the basis weight balance of the superabsorbent polymer particles 6.
That is, in the first embodiment, the basis weight of the first particle 6A in the region where the first particle 6A is disposed and the basis weight of the second particle 6B in the region where the second particle is disposed are. The same example has been described. However, in the fourth embodiment, the basis weight of the first particles 6A in the region where the first particles 6A are arranged is less than the basis weight of the second particles 6B in the region where the second particles are arranged. .
For this reason, in this embodiment, the total surface area of the first particles 6A is smaller than that in the first embodiment, and the possibility of the occurrence of gel blocks is lower than that in the first embodiment.

(Fifth embodiment)
Next, one Embodiment of an absorbent article provided with the absorber 1 mentioned above is described. In the present embodiment, a disposable diaper 100 will be described as an example of an absorbent article. FIG. 5 is a development view of the disposable diaper 100, as viewed from the skin side (the side in contact with the skin).

  The disposable diaper 100 includes a liquid-permeable top sheet 102 made of a nonwoven fabric or an apertured plastic film, a liquid-impermeable back sheet 103 made of a plastic film, and a first embodiment disposed between the two sheets 102 and 103. And an absorbent body 1 in the form. The disposable diaper 100 is formed in a rectangular shape with a constricted central portion in the longitudinal direction LD.

The top sheet 102 and the back sheet 103 constitute the outer shape of the disposable diaper 100 and have portions extending from the periphery of the absorbent body 1. The top sheet 102 and the back sheet 103 are joined by a hot melt adhesive at a portion extending from the periphery of the absorbent body 1.
Moreover, as for the absorber 1, the core wrap sheet | seat 4 is joined to the surface sheet 102 and the back surface sheet 103 via the hot-melt-adhesive agent. In addition to fixing the position of the absorbent body 1 by bonding the core wrap sheet 4 to the top sheet 102 and the back sheet 103, the adhesion between the absorbent body 1 and the top sheet 102 is improved, and the excreted liquid Quickly penetrates into the absorbent body 1.

  The disposable diaper 100 is positioned between a front waistline region 106 disposed on one end side in the longitudinal direction LD, a rear waistline region 107 disposed on the other end side in the longitudinal direction LD, and the both waistline regions 106, 107. And a crotch region 108.

On the left and right side edges of the crotch region 108, left and right leg periphery side edges 116 curved inward are formed. On the inner surface of the diaper 100, a pair of leak-proof cuffs 118 extending in the longitudinal direction LD on the inner side of the leg periphery side edge 116 are formed.
The cuff 118 has front and rear end edges 121 and 122 and an outer edge 123 fixed to the inner surface of the diaper 100. On the other hand, the inner edge 124 of the cuff 118 is in a non-fixed state, and forms a pocket 118A described later that opens toward a center line (not shown) that bisects the width direction of the diaper 100.
Two elastic members 125A and 125B extending in the front-rear direction are attached to the inner edge portion 124 of each cuff 118 in an extended state. In the unfolded state of FIG. 5, the cuff 118 falls on the top surface of the top sheet 102, and the pocket 118A is closed.

  FIG. 6 is a cross-sectional view taken along line XX of FIG. 5 when the diaper 100 is in a wearing state. As described above, when the diaper 100 is worn, if the inner surface is bent in the front-rear direction, the elastic members 125A and 125B contract, the cuff 118 stands up from the inner surface of the diaper 100 as shown, and the pocket 118A is diaper 100. A large opening inward.

  The cuff 118 includes an inner sheet 120 made of a liquid-impermeable film attached to the upper side (skin side) in FIG. 5 of the top sheet 102 and a liquid-impermeable or attached to the upper side of the inner sheet 120. It has a double structure of an outer sheet 119 made of a liquid poorly permeable nonwoven fabric. However, since the outer sheet 119 is longer in the width direction WD than the inner sheet 120, the outer sheet 119 is single above the cuff 118.

The elastic members 125A and 125B are arranged in the order of the elastic members 125B and 125A from the bottom in FIG. 5 (from the outside of the diaper 100 in FIG. 4). The elastic members 125B and 125A are bonded to the inner surface of the outer sheet 119 of the cuff 118 by a hot melt adhesive (not shown).
In the present embodiment, the inner sheet 120 extends to the inner side of the position where the elastic member 125 </ b> B is disposed in the outer sheet 119. However, the present invention is not limited to this, and the inner sheet 120 may be wider, for example, the same width as the outer sheet 119.

In the disposable diaper 100 of the present embodiment, when urine is absorbed from the skin side surface 2A, the urine first passes through the region where the first particles 6A are disposed, as in the above-described embodiment.
Here, for example, when the basis weight is the same, comparing the region where the first particles 6A are present and the region where the second particles 6B are present, the region where the first particles 6A are present has a smaller particle size. Therefore, the surface area is large.
Moreover, since the absorption speed by the Vortex method is as short as 22 seconds or less, the first particles 6A absorb urine more rapidly. Therefore, when urine flows in, it is instantaneously absorbed by the first particles 6A. However, if a large amount of urine flows and exceeds the allowable amount, the first particles 6A may partially cause a gel block.

When the gel block is generated, if urine further flows, the urine spreads laterally from the portion where the gel block is generated and flows to the portion where the gel block is not generated. And it is absorbed by the 1st particle 6A in the part, or flows under (clothing side) and flows in between 2nd particles 6B.
The second particles 6B have an average particle size larger than that of the first particles 6A and an absorption rate of more than 22 seconds and 25 seconds or less. In addition, the surface area of the particles that absorb urine is small.
That is, in the second particle 6B, the urine that has not been absorbed by the first particle 6A is absorbed over a relatively long time, and the urine is retained by the second particle 6B.
When the amount of urine is larger and cannot be held by the second particles 6 </ b> B, the remaining urine is absorbed by the fiber sheet 3 arranged in the lower layer (clothing side) of the absorbent core 2.

Further, when urine flows out to the side surface of the absorbent core 2 due to the gel block generated in the region where the first particles 6 </ b> A exist, the urine is prevented from flowing to the outside by the core wrap sheet 4.
The urine absorbed by the side surface of the core wrap sheet 4 flows along the core wrap sheet 4 to the lower part (clothing side) and is held by the clothing side of the fiber sheet 3 or the core wrap sheet 4.
The core wrap sheet 4 can absorb not only urine flowing on the side but also urine flowing from the fiber sheet 3 and not absorbed by the fiber sheet 3.

  Moreover, the diaper 100 of this embodiment is provided with the cuff 118, and the inner sheet 120 made of a liquid-impermeable film extends to the inside of the cuff 118 up to a position where at least the elastic member 125B is provided. . Therefore, the possibility of liquid leakage is further reduced, and urine is reliably held in the pocket 118A.

  As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to this, For example, the absorber 1 of this invention absorbs disposable body fluids, such as a sanitary napkin other than the diaper 100 mentioned above. It can also be used for a property article.

  1: Absorber, 2: Absorbent core, 2A: Skin side, 2B: Clothing side, 3: Fiber sheet, 4: Core wrap sheet, 5: Fiber layer, 6: Superabsorbent polymer particle, 6A: First particle , 6B: second particles, 25: elastic member, 100: disposable diaper, 102: top sheet, 103: back sheet

Claims (10)

An absorbent body for an absorbent article comprising an absorbent core having liquid absorbency and a core wrap sheet covering the absorbent core,
The absorbent core is
A fiber layer having thermoplastic fibers;
Containing the superabsorbent polymer particles that are dispersed in the fiber layer and have an absorption rate of 25 seconds or less by the Vortex method,
The superabsorbent polymer particles are
First particles arranged on the skin side surface;
Including second particles having a larger particle diameter than the first particles, disposed on a clothing side surface;
An absorbent body for absorbent articles. An absorbent body for an absorbent article according to claim 1,
The absorption rate by the Vortex method of the first particles is smaller than the absorption rate by the Vortex method of the second particles;
An absorbent body for absorbent articles.   The absorber according to claim 2, wherein the ratio of the absorption rate of the second particles by the Vortex method to the absorption rate of the first particles by the Vortex method is in the range of 1.0 to 1.5. An absorbent body for an absorbent article according to claim 2 or 3,
The first particles have an absorption rate by the Vortex method of 22 seconds or less,
The second particles have an absorption rate by the Vortex method of more than 22 seconds and 25 seconds or less,
An absorbent body for absorbent articles. An absorbent body for an absorbent article according to any one of claims 1 to 4,
The particle size of the first particles is 150 μm to 450 μm,
The particle size of the second particles is 350 μm to 850 μm,
An absorbent body for absorbent articles. An absorbent body for an absorbent article according to any one of claims 1 to 5,
Containing a hydrophilic fiber sheet on the clothing side of the absorbent core;
An absorbent body for absorbent articles. An absorbent body for an absorbent article according to any one of claims 1 to 6,
The core wrap sheet has a basis weight of a portion disposed on the skin side surface of the absorbent core.
It is smaller than the portion disposed on the clothing side surface of the absorbent core,
An absorbent body for absorbent articles. An absorbent body for an absorbent article according to any one of claims 1 to 7,
The core wrap sheet has a larger number of parts arranged on the clothing side surface of the absorbent core than the number arranged on the skin side surface of the absorbent core,
An absorbent body for absorbent articles. An absorbent body for an absorbent article according to any one of claims 1 to 8,
The basis weight of the first particles in the region where the first particles are disposed in the absorbent core is smaller than the basis weight of the second particles in the region where the second particles are disposed. ,
An absorbent body for absorbent articles. The absorbent body according to any one of claims 1 to 9, wherein the absorbent body is interposed between a liquid-permeable surface sheet, a liquid-impermeable back sheet, and the liquid-permeable surface sheet and the liquid-impermeable back sheet. And an absorbent article comprising, along the longitudinal direction, a front waistline region, a back waistline region, and a crotch region located between these regions,
The crotch region is provided with a pair of liquid-proof cuffs standing upright from the absorbent core when the absorbent article is worn on the side edge in the width direction,
Each of the liquid cuffs is
Two or more elastic members that contract when being worn to erect the liquid-proof cuff;
A liquid-impermeable film extending from the portion attached to the liquid-permeable surface sheet in the liquid-proof cuff to the inner side of the elastic member disposed on the outermost side in the width direction among the elastic members; Having
Absorbent article characterized by.

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