JP2021101926A - Absorbent article - Google Patents

Abstract

To provide an absorbent article which can improve a wet feeling of a surface of the absorbent article at the time of wearing the absorbent article by quickly moving body fluid received by a liquid-permeable surface sheet to an absorber while making the user's touch excellent.SOLUTION: An absorbent article 1 comprises: a liquid-permeable surface sheet 2; a liquid-impermeable rear surface sheet 3; and an absorber 4 which is arranged between the liquid-permeable surface sheet 2 and the liquid-impermeable rear surface sheet 3. The liquid-permeable surface sheet 2 comprises: an upper layer nonwoven fabric 21 which is arranged on a skin side and has a hydrophilic property; and a lower layer nonwoven fabric 22 which is integrated with the upper layer nonwoven fabric 21 not through an adhesive layer and has the hydrophilic property. The liquid-permeable surface sheet 2 comprises: a plurality of openings 23 which penetrates through the upper layer nonwoven fabric 21 and lower layer nonwoven fabric 22; and a protrusion part 24 which protrudes to the absorber 4 side from the peripheral edge of each of the plurality of openings 23 and whose tip contacts the absorber 4. An average fiber diameter of the upper layer nonwoven fabric 21 is between 1 dtex and 2 dtex. An average fiber diameter of the lower layer nonwoven fabric 22 is between 4 dtex and 6 dtex.SELECTED DRAWING: Figure 2

Description

The present invention relates to absorbent articles.

Patent Document 1 describes conventional absorbent articles. The sanitary napkin described in Patent Document 1 includes a liquid-permeable front sheet, a liquid-permeable back sheet arranged on the back side of the liquid-permeable front sheet, a liquid-permeable front sheet, and a liquid-permeable back sheet. It is provided with an absorber interposed between the and.

The liquid-permeable surface sheet has a two-layer structure of an upper-layer non-woven fabric arranged on the skin side and a lower-layer non-woven fabric arranged on the non-skin side. In the sanitary napkin described in Patent Document 1, the upper non-woven fabric has hydrophilicity, while the lower non-woven fabric has water repellency, whereby the amount of reversion of the body fluid once absorbed by the absorber is reduced. obtain.

JP-A-2017-221341

However, in the sanitary napkin described in Patent Document 1, since the lower layer non-woven fabric has water repellency, the absorption rate of the liquid-permeable surface sheet is slow. Therefore, when a large amount of body fluid is received by the liquid-permeable surface sheet at one time, there is a problem that the body fluid may overflow before being absorbed by the absorber.

On the other hand, in order to simply increase the absorption rate, it is conceivable to increase the fiber diameter of the liquid-permeable surface sheet to reduce the fiber density, but in this case, there is a problem that the user feels poor.

The present invention has been made in view of the above circumstances, and it is possible to quickly move the body fluid received by the liquid-permeable surface sheet to the absorber and improve the wet feeling of the surface when worn, while making the user feel good. The purpose is to provide an absorbent article that can be produced.

One aspect of the absorbent article according to the present invention includes a liquid-permeable front sheet arranged so as to face the user's skin, an impermeable back sheet arranged on the back side of the liquid-permeable front sheet, and an impermeable back sheet. It includes an absorber arranged between the liquid-permeable front sheet and the impermeable back sheet. The liquid-permeable surface sheet is arranged on the liquid-permeable back sheet side with respect to the hydrophilic upper-layer non-woven fabric arranged on the skin side and the upper-layer non-woven fabric, and does not pass through the adhesive layer on the upper-layer non-woven fabric. It has a hydrophilic underlayer non-woven fabric integrated with. The liquid-permeable surface sheet has a plurality of openings penetrating the upper-layer non-woven fabric and the lower-layer non-woven fabric, and a protrusion that projects from the peripheral edge of each of the plurality of openings toward the absorber and the tip thereof contacts the absorber. And, including. The average fiber diameter of the upper layer non-woven fabric is 1 dtex or more and 2 dtex or less, and the average fiber diameter of the lower layer non-woven fabric is 4 dtex or more and 6 dtex or less.

In the absorbent article, the amount of heat-sealed fibers contained in the absorber is preferably smaller than a predetermined ratio.

In the absorbent article, it is preferable that the absorber does not contain the heat-sealed fibers.

In the absorbent article, the absorber preferably has an embossed portion that has been embossed.

In the absorbent article, the aperture ratio of the plurality of openings is preferably 3% or more and 15% or less.

In the absorbent article, the basis weight of the liquid-permeable surface sheet ^{is preferably 20 g / m 2} or more and 45 g / m ² or less.

In the absorbent article, the thickness of the absorbent article is preferably 2.5 mm or less.

The absorbent article of the above-described aspect according to the present invention quickly moves the body fluid received by the liquid-permeable surface sheet to the absorbent body while improving the feel of the user, and improves the wet feeling of the surface when worn. There is an advantage that it can be done.

FIG. 1 is a front view of an absorbent article according to an embodiment of the present invention. FIG. 2A is a cross-sectional view taken along the line X1-X1 in FIG. FIG. 2B is an enlarged view of a portion A in FIG. 2A.

(1) Embodiment Hereinafter, the absorbent article 1 according to the present embodiment will be described in detail.

(1.1) Overall The absorbent article 1 according to the present embodiment is attached to underwear, clothes, or the like when used to absorb body fluids. As the body fluid, for example, vaginal discharge, menstrual blood, urine, sweat and the like are assumed. Examples of the absorbent article 1 include a vaginal discharge sheet, a sanitary napkin, a diaper, incontinence pants, urine leakage pants, a side sweat pad, and the like. In the present embodiment, as shown in FIG. 1, a vaginal discharge sheet will be given as an example of the absorbent article 1.

As shown in FIG. 2A, the absorbent article 1 includes a liquid-permeable front surface sheet 2, an impermeable back surface sheet 3, and an absorbent body 4. The absorbent article 1 has a multi-layer structure in which a liquid-permeable front sheet 2, an absorber 4, and a liquid-impermeable back sheet 3 are laminated in this order from the front side surface to the back side surface. The "front surface" as used herein means a surface facing the user's skin when worn, and when the absorbent article 1 is worn, the liquid-permeable surface sheet 2 comes into contact with the user's skin.

In the absorbent article 1 according to the present embodiment, an adhesive layer 6 is formed on the back surface of the impermeable back sheet 3. The absorbent article 1 is attached to the underwear when worn by the adhesive layer 6. Further, as shown in FIG. 1, a crimping portion 5 is formed on the outer peripheral edge portion of the absorbent article 1 over the entire outer peripheral edge. The crimping portion 5 fixes the liquid-permeable front sheet 2, the absorber 4, and the impermeable back sheet 3 to each other. The thickness of the crimping portion 5 is thinner than that of the portion other than the crimping portion 5. In the present embodiment, in the absorbent article 1, the crimping portion 5 is not formed except for the outer peripheral edge portion.

The thickness of the absorbent article 1 is preferably 2.5 mm or less, more preferably 2.3 mm or less, still more preferably 2.2 mm or less. The "thickness of the absorbent article 1" as used herein means the average thickness of the portion excluding the crimping portion 5. By adopting the following configuration, the absorbent article 1 according to the present embodiment can realize the absorbent article 1 which is soft to the touch and has a high absorption rate even with a thickness of 2.5 mm or less.

(1.1.1) Liquid-permeable surface sheet The liquid-permeable surface sheet 2 is a sheet having liquid permeability. As shown in FIG. 2A, the liquid-permeable surface sheet 2 is formed by entwining fibers with each other and integrating the upper-layer non-woven fabric 21 and the lower-layer non-woven fabric 22 without interposing an adhesive layer. .. The integration of the upper-layer non-woven fabric 21 and the lower-layer non-woven fabric 22 is realized by, for example, a span lace method, a needle punch method, a water flow entanglement method, or the like. As described above, the liquid-permeable surface sheet 2 is arranged so as to face the user's skin when worn. Therefore, in order to improve the feel on the skin, the upper-layer non-woven fabric 21 is configured to have a smaller average fiber diameter and a higher fiber density than the lower-layer non-woven fabric 22.

Further, the liquid-permeable surface sheet 2 is formed with a plurality of openings 23 penetrating the upper-layer non-woven fabric 21 and the lower-layer non-woven fabric 22. The aperture ratio of the plurality of openings 23 is not particularly limited as long as it is larger than 0%, but is preferably 3% or more and 15% or less, and more preferably 5% or more and 12.5% or less. The "aperture ratio" here means the ratio of the total area of the opening surfaces of the openings 23 to the unit area of the liquid-permeable surface sheet 2. If the aperture ratio is less than 3%, the flow rate of the body fluid that passes through the opening 23 of the liquid-permeable surface sheet 2 and flows to the absorber 4 tends to decrease, and the absorption rate tends to slow down. On the other hand, when the aperture ratio exceeds 15%, the reversion of the body fluid after the absorber 4 has absorbed the body fluid (hereinafter, may be referred to as “reversion of body fluid” or simply “reversion”) is likely to occur.

The size of each opening 23 is not particularly limited, but for example, the maximum dimension between the intersection of the straight line passing through the center of the opening surface and the opening edge is 0.2 mm or more and 2 mm or less. It is preferable, more preferably 0.4 mm or more and 1.5 mm or less. When the opening surface is circular, the inner diameter of the opening surface is the "maximum dimension".

The opening 23 may be formed over the entire surface of the liquid-permeable surface sheet 2, or may be formed only in a portion that is susceptible to body fluid when worn. The shape of the opening 23 is not particularly limited, and examples thereof include a round shape, a fan shape, a triangular shape, a square shape, and a pentagonal shape. The arrangement of the plurality of openings 23 is also not particularly limited, and may be arranged in a grid pattern, in a staggered pattern, or at random.

The opening 23 is formed by integrating the upper-layer non-woven fabric 21 and the lower-layer non-woven fabric 22 and then inserting a needle from the upper-layer non-woven fabric 21 toward the lower-layer non-woven fabric 22. Therefore, as shown in FIG. 2B, a protruding portion 24 protruding toward the absorber 4 is formed from at least a part of the opening peripheral edge of the opening 23.

The protruding portion 24 is a portion that protrudes (protrudes) from the back surface of the lower layer nonwoven fabric 22 when the opening 23 is formed. The protrusion 24 may be formed over the entire length of the opening peripheral edge of the opening 23, or may be formed on a part of the opening peripheral edge. The tip of the opening 23 is in contact with the absorber 4, which may create a slight void 25 between the underlayer non-woven fabric 22 and the absorber 4. The gap 25 can improve the absorbability of the body fluid of the absorbent article 1 and reduce the reversion.

The basis weight of the liquid-permeable surface sheet 2 is not particularly limited, but is preferably 20 g / m ² or more and 45 g / m ² or less, more preferably 25 g / m ² or more and 35 g / m ² or less, and further. It is preferably 35 g / m ² . In the liquid-permeable surface sheet 2, the smaller the basis weight, the more the reversion can be reduced.

(1.1.1.1) Upper layer non-woven fabric The upper layer non-woven fabric 21 constitutes a surface facing the skin when worn. The upper layer non-woven fabric 21 is made of a hydrophilic non-woven fabric. The hydrophilicity of the upper layer nonwoven fabric 21 may be exhibited by the hydrophilicity of the material itself, or may be exhibited by subjecting the synthetic fiber to a surface treatment with a hydrophilic agent. Examples of the hydrophilic material include cotton, linen, wool and the like. Examples of the hydrophilic agent include anionic surfactants, carboxylic acid salts, acylated hydrolyzed proteins, sulfonates, sulfate ester salts, phosphate ester salts, nonionic surfactants, and polyoxyethylene-based surfactants. Examples thereof include agents, carboxylic acid esters, carboxylic acid amides, polyalkyrexide block copolymers, cationic surfactants, quaternary ammonium salts, amphoteric surfactants, imidazolinium derivatives and the like. Since the upper layer non-woven fabric 21 has hydrophilicity, the body fluid can be easily drawn into the liquid-permeable surface sheet 2 and the absorption rate becomes high.

The synthetic fiber constituting the upper-layer non-woven fabric 21 is not particularly limited, and for example, polyester such as polyethylene terephthalate (PET), polyethylene (PE; polyethylene), polypropylene (PP), rayon, nylon, acrylic. , Vinylon, etc., and one or more of these are mixed.

As described above, the average fiber diameter of the upper-layer non-woven fabric 21 is smaller than that of the lower-layer non-woven fabric 22, but specifically, it is set to 1 dtex or more and 2 dtex or less. Of these, 1.2 dtex or more and 1.6 dtex or less are preferable. If the average fiber diameter is smaller than 1 dtex, the fiber density becomes too large and the absorption rate decreases, making it difficult to draw the body fluid into the liquid-permeable surface sheet 2. On the other hand, if the average fiber diameter exceeds 2 dtex, the fiber density becomes too small and it is difficult to obtain a good feel on the skin.

When the "average fiber diameter" referred to in the present specification is a mixture of a plurality of types of fiber diameters, the value obtained by multiplying the fiber diameter by the ratio of the fiber diameter to the whole is calculated for each type of fiber diameter. Above, it is a numerical value obtained by adding up the values calculated for each type of fiber diameter. For example, when a fiber having a fiber diameter of 1.2 dtex and a ratio of 50% and a fiber having a fiber diameter of 2.0 dtex and a ratio of 50% are mixed, 1.2 × 0.5 + 2.0 × 0. Calculate as 5 = 1.6 dtex.

(1.1.1.2) Lower-layer non-woven fabric The lower-layer non-woven fabric 22 is arranged on the back surface side (that is, the impermeable back sheet 3 side) with respect to the upper-layer non-woven fabric 21. The lower layer non-woven fabric 22 is made of a hydrophilic non-woven fabric. Like the upper non-woven fabric 21, the hydrophilicity of the lower non-woven fabric 22 may be exhibited by the hydrophilicity of the material itself, or may be exhibited by subjecting the synthetic fiber to a surface treatment with a hydrophilic agent.

The synthetic fiber constituting the lower-layer non-woven fabric 22 is not particularly limited as in the upper-layer non-woven fabric 21, but for example, polyester such as polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP) , Rayon, nylon, acrylic, vinylon and the like, and one or more of these are mixed.

As described above, the average fiber diameter of the lower layer non-woven fabric 22 is larger than that of the upper layer non-woven fabric 21. As a result, the body fluid drawn in by the upper-layer non-woven fabric 21 can be quickly passed through and sent to the absorber 4. Since the absorption rate of the liquid-permeable surface sheet 2 tends to decrease when the difference between the average fiber diameter of the lower layer non-woven fabric 22 and the average fiber diameter of the upper layer non-woven fabric 21 is small, the absorption rate of the liquid-permeable surface sheet 2 is improved. From the above viewpoint, it is preferable that the difference between the average fiber diameter of the lower layer non-woven fabric 22 and the average fiber diameter of the upper layer non-woven fabric 21 is as large as possible.

The average fiber diameter of the lower layer non-woven fabric 22 is set to 4 dtex or more and 6 dtex or less because the upper layer non-woven fabric 21 is 1 dtex or more and 2 dtex or less. That is, the difference between the average fiber diameter of the lower layer non-woven fabric 22 and the average fiber diameter of the upper layer non-woven fabric 21 may be 2 dtex or more, but more preferably larger than 2 dtex. If the average fiber diameter of the lower layer non-woven fabric 22 is smaller than 4 dtex, the fiber density becomes too large and the absorption rate decreases, and it becomes difficult to send the body fluid drawn by the upper layer non-woven fabric 21 to the absorber 4. On the other hand, if the average fiber diameter of the lower layer non-woven fabric 22 is larger than 6 dtex, the fiber density becomes too small, and the reversion of the body fluid tends to occur.

(1.1.2) Absorber The absorber 4 is arranged between the liquid-permeable front sheet 2 and the impermeable back sheet 3, and is formed in a sheet shape here. The absorber 4 is not particularly limited as long as it has water absorption of body fluid, and generally, for example, an absorber 4 used for sanitary napkins, vaginal discharge sheets, diapers, sweat absorbing sheets and the like can be used. .. From the viewpoint of water absorption of body fluid, the absorber 4 preferably contains a water-absorbent polymer (SAP), but may not contain a water-absorbent polymer, for example, known absorbent materials, textiles, and the like. An aggregate composed of one or more of knitted fabrics, non-woven fabrics, pulp products, natural fibers, synthetic fibers, and composite fibers can be used. Examples of natural fibers include cotton, silk, pulp, wool, hemp and the like. Examples of the synthetic fiber include nylon fiber, polyethylene fiber, polyester fiber, polyamide fiber, acrylic fiber, polyvinyl alcohol fiber, polypropylene fiber, polyethylene terephthalate fiber, ethylene vinyl acetate fiber, urethane fiber, acrylic fiber and the like. Further, as the synthetic fiber, for example, a semi-synthetic fiber such as rayon fiber, acetate fiber, cupra, and a mixed cotton product or a mixed fiber product of various fibers can be used. Examples of the composite fiber include polyethylene / polyester (including polyethylene terefurate) composite fiber, polyethylene / polypropylene composite fiber, ethylene vinyl acetate / polypropylene composite fiber and the like.

However, from the viewpoint of preventing the reversion of the body fluid, the absorber 4 preferably contains a small amount of heat-sealed fibers, more preferably smaller than a predetermined ratio, and does not contain heat-sealed fibers. Is even more preferable. When the absorber 4 contains heat-sealed fibers such as polypropylene and polyethylene in a predetermined ratio or more, the absorption rate becomes faster than that of the absorber 4 which does not contain the heat-sealed fibers, but the body fluid Reversion is likely to occur.

The term "smaller than a predetermined ratio" as used herein means the ratio of heat-sealed fibers to the basis weight within a range in which it can be evaluated that the reversion of body fluid is unlikely to occur. For example, if it is less than 10% with respect to the basis weight, the reversion of body fluid is unlikely to occur, and it is in the category of "less than a predetermined ratio".

Further, the absorber 4 preferably has a plurality of embossed portions from the viewpoint of increasing the amount of absorption. The embossed portion is formed by denting the surface of the absorber 4 by performing a thermocompression bonding process (embossing process) in which heat and pressure are applied to make irregularities. By having a plurality of embossed portions, the fiber density is partially increased in the embossed portions, and the absorption amount is larger than that of the absorber without the embossed portions. The shape of the embossed portion is not particularly limited, and is formed in, for example, a circular shape, a dot shape, a pattern shape, an island shape, a linear shape, a grid shape, a donut shape, or the like. The embossed portion may be formed over the entire surface or may be formed densely only in a part thereof.

(1.1.3) Impermeable back sheet The impermeable back sheet 3 is arranged on the back side of the liquid permeable front sheet 2 and has a property of impermeable to body fluids. The liquid-impermeable back sheet 3 is a back sheet that constitutes the back surface of the absorbent article 1. The liquid-impermeable back sheet 3 is a sheet (including a film) that prevents the body fluid absorbed by the absorber 4 from flowing out to the outside, and is composed of a liquid-impermeable film in the present embodiment. .. Examples of the liquid-impermeable back sheet 3 include a single-layer film made of polyethylene, polypropylene, polyester, nylon, polyvinyl alcohol, cellophane, vinyl chloride, etc., and a multilayer film in which two or more of these are laminated. .. Further, as the impermeable back sheet 3, a liquid impermeable non-woven fabric such as SMS, a spunbonded non-woven fabric, a point-bonded non-woven fabric, or the like laminated with a resin film can be used in consideration of air permeability.

(2) Action and Effect As described above, the absorbent article 1 according to the present embodiment has a hydrophilic upper non-woven fabric 21 and a hydrophilic lower layer integrated with the upper non-woven fabric 21 without an adhesive layer. A liquid-permeable surface sheet 2 having a non-woven fabric 22 and the liquid-permeable surface sheet 2 is provided with a plurality of openings 23 penetrating the upper-layer non-woven fabric 21 and the lower-layer non-woven fabric 22, and peripheral edges of each of the plurality of openings 23. Includes a protruding portion 24 that protrudes toward the absorber 4 and whose tip contacts the absorber 4. The average fiber diameter of the upper-layer non-woven fabric 21 is 1 dtex or more and 2 dtex or less, and the average fiber diameter of the lower-layer non-woven fabric 22 is 4 dtex or more and 6 dtex or less.

As described above, since the average fiber diameter of the upper layer non-woven fabric 21 is 1 dtex or more and 2 dtex or less, the fiber density of the surface in contact with the user's skin can be high and the feel can be improved, while the upper layer non-woven fabric 21 and the lower layer non-woven fabric 22 can be improved. Since there is a difference in fiber density between the above and the body fluid, the body fluid can be quickly sent to the absorber 4. Further, since it has a plurality of openings 23 and the protruding portion 24 is in contact with the absorber 4, the body fluid can be sent to the absorber 4 more quickly. As a result, according to the absorbent article 1 according to the present embodiment, the body fluid received by the liquid-permeable surface sheet 2 is quickly moved to the absorbent body 4 while making the user feel good, and the surface of the surface when worn is quickly moved. The wet feeling can be improved.

Further, in the absorbent article 1 according to the present embodiment, since the amount of heat-sealed fibers contained in the absorber 4 is smaller than a predetermined ratio, the reversion of the body fluid can be effectively prevented. In particular, if the absorber 4 does not contain the heat-sealing fibers, the reversion of the body fluid can be further effectively prevented.

Further, in the absorbent article 1 according to the present embodiment, since the absorber 4 has an embossed portion, it is compared with the absorbent article 1 having the absorber 4 having no embossed portion. , Absorption amount is large.

Further, in the absorbent article 1 according to the present embodiment, since the aperture ratio of the plurality of openings 23 is 3% or more and 15% or less, the absorption rate can be further increased.

Further, in the absorbent article 1 according to the present embodiment, since the basis weight of the liquid-permeable surface sheet 2 is 20 g / m ² or more and 40 g / m ² or less, body fluid can be quickly taken in and the surface of the surface when worn can be taken in quickly. The wet feeling can be further improved.

Further, since the thickness of the absorbent article 1 according to the present embodiment is 2.5 mm or less, it is possible to increase the absorption rate and improve the wet feeling of the surface when worn while making the skin feel good. Even though it is a thing, it can be used without discomfort even if it is placed in underwear. Therefore, in particular, when it is used as a vaginal discharge sheet, it can be a vaginal discharge sheet suitable for the needs of the user.

(3) Examples Hereinafter, the present invention will be described in more detail with reference to Examples. However, the absorbent article according to the present invention is not limited to the following examples.

(3.1) Example 1
As the absorbent article according to Example 1, the upper non-woven fabric, the lower non-woven fabric and the absorbent body were composed of the following configurations, and the impermeable back sheet was composed of a polyethylene film. Then, a test was conducted using the absorbent article according to Example 1.
-Upper layer non-woven fabric: Hydrophilic fibers are used, and the fiber composition is 1.2 dtex PET / PE: 50%, 2.0 dtex PET / PE: 50%, basis weight is 10 g / m ^2, and size is 50. It was set to × 150 mm. The average fiber diameter is 1.2 dtex × 50% + 2.0 dtex × 50% = 1.6 dtex.
-Lower layer non-woven fabric: Hydrophilic fibers were used, and the fiber composition was 4.0 dtex PET / PE: 100%, the basis weight was 25 g / m ² , and the size was 50 × 150 mm. The average fiber diameter is 4.0 dtex.
・ Metsuke of liquid permeable surface sheet: 35g / m ²
Absorber: The layer composition was tissue 16 g, SAP 54 g, PP / PE 19.2 g, pulp 44.8 g, tissue 16 g, the overall basis weight was 150 g / m ² , and the entire surface was embossed.
-Aperture ratio of the opening of the liquid-permeable surface sheet: 12.5%
-Thickness of absorbent article: 2.3 mm

As a test, absorption rate, absorption amount, reversion rate after 20 seconds (indicated as "reversion 20 seconds" in Tables 1 and 2), reversion rate after 1 minute (1 ml / 3 ml) (1 ml reversion rate in the table) Is described as "1 ml reversion 1 minute", the reversion rate of 3 ml is described as "3 ml reversion 1 minute"), and the reversion rate after 5 minutes of the viscous liquid (described as "viscous reversion" in the table) was measured. ..

The absorption rate was measured as follows. 3 cc of physiological saline was added dropwise to the surface of the liquid-permeable surface sheet using an auto burette (150 ml / min), and the time until all the physiological saline was absorbed from the surface of the liquid-permeable surface sheet was measured. ..
Then, the measurement result was evaluated as follows. Less than 5 seconds: "◎" 5 seconds or more and less than 10 seconds: "○" 10 seconds or more: "x".

The amount of absorption was measured as follows. The absorbent article of this example was attached to a filter paper (20 × 10 cm), and physiological saline was added dropwise to the surface of the liquid-permeable surface sheet in 1 cc increments using an auto burette (150 ml / min). After 30 seconds, a 3.6 kg weight was placed on the filter paper for 30 seconds, and it was confirmed whether or not the physiological saline had exuded on the filter paper, and the maximum amount of the physiological saline that did not exude was taken as the absorption amount.
Then, the measurement result was evaluated as follows. 7g or more: "◎" 3g or more and less than 7g: "○" Less than 3g: "x".

The relapse rate after 20 seconds was measured as follows. First, the weight of 10 filter papers (150 x 75 mm) is measured. Next, 3 ml of physiological saline was added dropwise to the absorbent article of this example using an auto burette (60 ml / sec), and 20 seconds after the start of the addition, a filter paper was placed on the filter paper, and 1 kg (154 mm × 154 mm ×) was placed on the filter paper. A weight of 65 mm) was placed and left for 1 minute. Then, after 1 minute, the weight of the filter paper in the state of absorbing the physiological saline was measured, and the reversion rate was measured by the following formula.
(Reverse rate (%)) = {(Weight of filter paper after absorbing physiological saline)-(Weight of 10 filter papers)} / 10 x 100
Then, the measurement result was evaluated as follows for the reversion rate after 20 seconds. Less than 2%: "◎" 2% or more and less than 10%: "○" 10% or more: "×".

The relapse rate after 1 minute was measured as follows. First, the weight of 10 filter papers (150 x 75 mm) is measured. Next, 1 ml or 3 ml of physiological saline was added dropwise to the absorbent article of this example using an auto burette (60 ml / sec), 1 minute after the start of the addition, a filter paper was placed, and 1 kg (1 kg (60 ml / sec)) was placed on the filter paper. A weight of 154 mm × 65 mm) was placed and left for 1 minute. Then, after 1 minute, the weight of the filter paper in the state of absorbing the physiological saline was measured, and the reversion rate was measured by the following formula.
(Reverse rate (%)) = {(Weight of filter paper after absorbing physiological saline)-(Weight of 10 filter papers)} / 10 x 100
Then, the measurement results were evaluated as follows for the reversion ratio (1 ml / 3 ml) after 1 minute. Less than 2%: "◎" 2% or more and less than 10%: "○" 10% or more: "×".

The reversion rate of the viscous liquid after 5 minutes was measured as follows. First, the weight of 10 filter papers (150 x 75 mm) is measured. Next, 500 μl of a viscous liquid having a viscosity of 200-250 mps (B-type viscometer 30 rpm 30 sec M2 25 ° C.) was dropped onto the absorbent article of this example with a pipette man, and 5 minutes after the start of the dropping, the filter paper was placed on the filter paper. A 1 kg (154 mm × 65 mm) weight was placed on top of the weight and left for 1 minute. Then, after 1 minute, the weight of the filter paper in the state of absorbing the physiological saline was measured, and the reversion rate was measured by the following formula.
(Reverse rate (%)) = {(Weight of filter paper after absorbing physiological saline)-(Weight of 10 filter papers)} / 10 x 100
Then, the measurement result was evaluated as follows with respect to the reversion rate of the viscous liquid after 5 minutes). Less than 15%: "◎" 15% or more and less than 20%: "○" 20% or more: "x".

The results are shown in Table 1 below.

(3.2) Example 2
As the absorbent article according to Example 2, the upper layer non-woven fabric, the lower layer non-woven fabric and the absorber were composed of the following configurations, and the impermeable back sheet was composed of a polyethylene film. Then, a test was conducted using the absorbent article according to Example 2.
-Upper layer non-woven fabric: Hydrophilic fibers are used, and the fiber composition is 1.2 dtex PET / PE: 50%, 2.0 dtex PET / PE: 50%, basis weight is 10 g / m ^2, and size is 50. It was set to × 150 mm. The average fiber diameter is 1.2 dtex × 50% + 2.0 dtex × 50% = 1.6 dtex.
-Lower layer non-woven fabric: Hydrophilic fibers were used, and the fiber composition was 4.0 dtex PET / PE: 100%, the basis weight was 25 g / m ² , and the size was 50 × 150 mm. The average fiber diameter is 4.0 dtex.
・ Metsuke of liquid permeable surface sheet: 35g / m ²
Absorber: The layer composition was 15.5 g of tissue, 75 g of SAP, 44 g of pulp, and 15.5 g of tissue, the overall basis weight was 150 g / m ² , and the entire surface was embossed.
-Aperture ratio of the opening of the liquid-permeable surface sheet: 10%
-Thickness of absorbent article: 1.73 mm

As a test, the absorption rate, the absorption amount, the reversion rate after 20 seconds, the reversion rate after 1 minute (3 ml), and the reversion rate after 5 minutes of the viscous liquid were measured in the same manner as in Example 1. The results are shown in Table 1 below.

(3.3) Example 3
As the absorbent article according to Example 3, the upper layer non-woven fabric, the lower layer non-woven fabric and the absorber were composed of the following constitutions, and the impermeable back sheet was composed of a polyethylene film. Then, a test was conducted using the absorbent article according to Example 3.
-Upper layer non-woven fabric: Hydrophilic fibers are used, and the fiber composition is 1.2 dtex PET / PE: 50%, 2.0 dtex PET / PE: 50%, basis weight is 10 g / m ^2, and size is 50. It was set to × 150 mm. The average fiber diameter is 1.2 dtex × 50% + 2.0 dtex × 50% = 1.6 dtex.
-Lower layer non-woven fabric: Hydrophilic fibers were used, and the fiber composition was 4.0 dtex PET / PE: 100%, the basis weight was 25 g / m ² , and the size was 50 × 150 mm. The average fiber diameter is 4.0 dtex.
・ Metsuke of liquid permeable surface sheet: 35g / m ²
Absorber: The layer composition was 15.5 g of tissue, 75 g of SAP, 44 g of pulp, and 15.5 g of tissue, the overall basis weight was 150 g / m ² , and the entire surface was embossed.
-Aperture ratio of the opening of the liquid-permeable surface sheet: 12.5%
-Thickness of absorbent article: 2.07 mm

As a test, the absorption rate, the absorption amount, the reversion rate after 20 seconds, the reversion rate after 1 minute (3 ml), and the reversion rate after 5 minutes of the viscous liquid were measured in the same manner as in Example 1. The results are shown in Table 1 below.

(3.4) Example 4
As the absorbent article according to Example 4, the upper layer non-woven fabric, the lower layer non-woven fabric and the absorber were composed of the following configurations, and the impermeable back sheet was composed of a polyethylene film. Then, a test was conducted using the absorbent article according to Example 4.
-Upper layer non-woven fabric: Hydrophilic fibers are used, and the fiber composition is 1.2 dtex PET / PE: 70%, 2.0 dtex PET / PE: 30%, basis weight 10 g / m ^2, and size 50. It was set to × 150 mm. The average fiber diameter is 1.2 dtex × 70% + 2.0 dtex × 30% = 1.44 dtex.
-Lower layer non-woven fabric: Hydrophilic fibers were used, and the fiber composition was 4.0 dtex PET / PE: 100%, the basis weight was 25 g / m ² , and the size was 50 × 150 mm. The average fiber diameter is 4.0 dtex.
・ Metsuke of liquid permeable surface sheet: 35g / m ²
Absorber: The layer composition was 15.5 g of tissue, 75 g of SAP, 44 g of pulp, and 15.5 g of tissue, the overall basis weight was 150 g / m ² , and the entire surface was embossed.
-Aperture ratio of the opening of the liquid-permeable surface sheet: 10%
・ Thickness of absorbent article: 1.58 mm

As a test, the absorption rate, the absorption amount, the reversion rate after 20 seconds, the reversion rate after 1 minute (3 ml), and the reversion rate after 5 minutes of the viscous liquid were measured in the same manner as in Example 1. The results are shown in Table 1 below.

(3.5) Example 5
As the absorbent article according to Example 5, the upper non-woven fabric, the lower non-woven fabric and the absorbent body were composed of the following configurations, and the impermeable back sheet was composed of a polyethylene film. Then, a test was conducted using the absorbent article according to Example 5.
-Upper layer non-woven fabric: Hydrophilic fibers are used, and the fiber composition is 1.2 dtex PET / PE: 70%, 2.0 dtex PET / PE: 30%, basis weight 10 g / m ^2, and size 50. It was set to × 150 mm. The average fiber diameter is 1.2 dtex × 70% + 2.0 dtex × 30% = 1.44 dtex.
-Lower layer non-woven fabric: Hydrophilic fibers were used, and the fiber composition was 4.0 dtex PET / PE: 100%, the basis weight was 25 g / m ² , and the size was 50 × 150 mm. The average fiber diameter is 4.0 dtex.
・ Metsuke of liquid permeable surface sheet: 35g / m ²
Absorber: The layer composition was 15.5 g of tissue, 75 g of SAP, 44 g of pulp, and 15.5 g of tissue, the overall basis weight was 150 g / m ² , and the entire surface was embossed.
-Aperture ratio of the opening of the liquid-permeable surface sheet: 12.5%
-Thickness of absorbent article: 1.99 mm

As a test, the absorption rate, the absorption amount, the reversion rate after 20 seconds, the reversion rate after 1 minute (3 ml), and the reversion rate after 5 minutes of the viscous liquid were measured in the same manner as in Example 1. The results are shown in Table 1 below.

(3.6) Example 6
As the absorbent article according to Example 6, the upper layer non-woven fabric, the lower layer non-woven fabric and the absorber were composed of the following configurations, and the impermeable back sheet was composed of a polyethylene film. Then, a test was conducted using the absorbent article according to Example 6.
-Upper layer non-woven fabric: Hydrophilic fibers were used, and the fiber composition was 1.2 dtex PET / PE: 100%, the basis weight was 13 g / m ² , and the size was 50 x 150 mm. The average fiber diameter is 1.2 dtex.
-Lower layer non-woven fabric: Hydrophilic fibers were used, and the fiber composition was 6.0 dtex PET / PE: 100%, the basis weight was 22 g / m ² , and the size was 50 × 150 mm. The average fiber diameter is 6.0 dtex.
・ Metsuke of liquid permeable surface sheet: 35g / m ²
Absorber: The layer composition was 15.5 g of tissue, 75 g of SAP, 44 g of pulp, and 15.5 g of tissue, the overall basis weight was 150 g / m ² , and the entire surface was embossed.
-Opening ratio of the opening of the liquid-permeable surface sheet: 5%
-Thickness of absorbent article: 1.74 mm

As a test, the absorption rate, the absorption amount, the reversion rate after 20 seconds, the reversion rate after 1 minute (3 ml), and the reversion rate after 5 minutes of the viscous liquid were measured in the same manner as in Example 1. The results are shown in Table 1 below.

(3.7) Example 7
As the absorbent article according to Example 7, the upper layer non-woven fabric, the lower layer non-woven fabric and the absorber were composed of the following constitutions, and the impermeable back sheet was composed of a polyethylene film. Then, a test was conducted using the absorbent article according to Example 7.
-Upper layer non-woven fabric: Hydrophilic fibers were used, and the fiber composition was 1.2 dtex PET / PE: 100%, the basis weight was 13 g / m ² , and the size was 50 x 150 mm. The average fiber diameter is 1.2 dtex.
-Lower layer non-woven fabric: Hydrophilic fibers were used, and the fiber composition was 4.0 dtex PET / PE: 100%, the basis weight was 22 g / m ² , and the size was 50 × 150 mm. The average fiber diameter is 4.0 dtex.
・ Metsuke of liquid permeable surface sheet: 35g / m ²
Absorber: The layer composition was 15.5 g of tissue, 75 g of SAP, 44 g of pulp, and 15.5 g of tissue, the overall basis weight was 150 g / m ² , and the entire surface was embossed.
-Opening ratio of the opening of the liquid-permeable surface sheet: 5%
-Thickness of absorbent article: 2.07 mm

As a test, the absorption rate, the absorption amount, the reversion rate after 20 seconds, the reversion rate after 1 minute (3 ml), and the reversion rate after 5 minutes of the viscous liquid were measured in the same manner as in Example 1. The results are shown in Table 1 below.

(3.8) Example 8
As the absorbent article according to Example 8, the upper layer non-woven fabric, the lower layer non-woven fabric and the absorber were composed of the following constitutions, and the impermeable back sheet was composed of a polyethylene film. Then, a test was conducted using the absorbent article according to Example 8.
-Upper layer non-woven fabric: Hydrophilic fibers were used, and the fiber composition was 1.2 dtex PET / PE: 100%, the basis weight was 13 g / m ² , and the size was 50 x 150 mm. The average fiber diameter is 1.2 dtex.
-Underlayer non-woven fabric: Hydrophilic fibers were used, and the fiber composition was 4.0 dtex PET / PE: 100%, the basis weight was 32 g / m ² , and the size was 50 × 150 mm. The average fiber diameter is 4.0 dtex.
・ Metsuke of liquid permeable surface sheet: 45g / m ²
Absorber: The layer composition was 15.5 g of tissue, 75 g of SAP, 44 g of pulp, and 15.5 g of tissue, the overall basis weight was 150 g / m ² , and the entire surface was embossed.
-Opening ratio of the opening of the liquid-permeable surface sheet: 5%
-Thickness of absorbent article: 2.19 mm

As a test, the absorption rate, the absorption amount, the reversion rate after 20 seconds, the reversion rate after 1 minute (3 ml), and the reversion rate after 5 minutes of the viscous liquid were measured in the same manner as in Example 1. The results are shown in Table 1 below.

(3.9) Example 9
As the absorbent article according to Example 9, the upper non-woven fabric, the lower non-woven fabric and the absorbent body were composed of the following configurations, and the impermeable back sheet was composed of a polyethylene film. Then, a test was conducted using the absorbent article according to Example 9.
-Upper layer non-woven fabric: Hydrophilic fibers are used, and the fiber composition is 1.2 dtex PET / PE: 50%, 2.0 dtex PET / PE: 50%, basis weight is 10 g / m ^2, and size is 50. It was set to × 150 mm. The average fiber diameter is 1.2 dtex × 50% + 2.0 dtex × 50% = 1.6 dtex.
-Lower layer non-woven fabric: Hydrophilic fibers were used, and the fiber composition was 4.0 dtex PET / PE: 100%, the basis weight was 25 g / m ² , and the size was 50 × 150 mm. The average fiber diameter is 4.0 dtex.
・ Metsuke of liquid permeable surface sheet: 35g / m ²
Absorber: The layer composition was 15.5 g of tissue, 50 g of SAP, 139 g of pulp, and 15.5 g of tissue, and the overall basis weight was 220 g / m ² . However, it was not embossed.
-Aperture ratio of the opening of the liquid-permeable surface sheet: 10%
・ Thickness of absorbent article: 1.6 mm

As a test, the absorption rate, the absorption amount, the reversion rate after 20 seconds, the reversion rate after 1 minute (3 ml), and the reversion rate after 5 minutes of the viscous liquid were measured in the same manner as in Example 1. The results are shown in Table 1 below.

(3.10) Example 10
As the absorbent article according to Example 10, the upper layer non-woven fabric, the lower layer non-woven fabric and the absorber were composed of the following constitutions, and the impermeable back sheet was composed of a polyethylene film. Then, a test was conducted using the absorbent article according to Example 10.
-Upper layer non-woven fabric: Hydrophilic fibers are used, and the fiber composition is 1.2 dtex PET / PE: 50%, 2.0 dtex PET / PE: 50%, basis weight is 10 g / m ^2, and size is 50. It was set to × 150 mm. The average fiber diameter is 1.2 dtex × 50% + 2.0 dtex × 50% = 1.6 dtex.
-Lower layer non-woven fabric: Hydrophilic fibers were used, and the fiber composition was 4.0 dtex PET / PE: 100%, the basis weight was 25 g / m ² , and the size was 50 × 150 mm. The average fiber diameter is 4.0 dtex.
・ Metsuke of liquid permeable surface sheet: 35g / m ²
Absorber: The layer composition was 15.5 g of tissue, 50 g of SAP, 139 g of pulp, and 15.5 g of tissue, and the overall basis weight was 220 g / m ² . However, it was not embossed.
-Aperture ratio of the opening of the liquid-permeable surface sheet: 12.5%
・ Thickness of absorbent article: 2.0 mm

As a test, the absorption rate, the absorption amount, the reversion rate after 20 seconds, the reversion rate after 1 minute (3 ml), and the reversion rate after 5 minutes of the viscous liquid were measured in the same manner as in Example 1. The results are shown in Table 1 below.

(3.11) Example 11
As the absorbent article according to Example 11, the upper layer non-woven fabric, the lower layer non-woven fabric and the absorber were composed of the following constitutions, and the impermeable back sheet was composed of a polyethylene film. Then, a test was conducted using the absorbent article according to Example 11.
-Upper layer non-woven fabric: Hydrophilic fibers are used, and the fiber composition is 1.2 dtex PET / PE: 70%, 2.0 dtex PET / PE: 30%, basis weight 10 g / m ^2, and size 50. It was set to × 150 mm. The average fiber diameter is 1.2 dtex × 70% + 2.0 dtex × 30% = 1.44 dtex.
-Lower layer non-woven fabric: Hydrophilic fibers were used, and the fiber composition was 4.0 dtex PET / PE: 100%, the basis weight was 25 g / m ² , and the size was 50 × 150 mm. The average fiber diameter is 4.0 dtex.
・ Metsuke of liquid permeable surface sheet: 35g / m ²
Absorber: The layer composition was 15.5 g of tissue, 50 g of SAP, 139 g of pulp, and 15.5 g of tissue, and the overall basis weight was 220 g / m ² . However, it was not embossed.
-Aperture ratio of the opening of the liquid-permeable surface sheet: 10%
・ Thickness of absorbent article: 1.5 mm

As a test, the absorption rate, the absorption amount, the reversion rate after 20 seconds, the reversion rate after 1 minute (3 ml), and the reversion rate after 5 minutes of the viscous liquid were measured in the same manner as in Example 1. The results are shown in Table 1 below.

(3.12) Example 12
As the absorbent article according to Example 12, the upper layer non-woven fabric, the lower layer non-woven fabric and the absorber were composed of the following constitutions, and the impermeable back sheet was composed of a polyethylene film. Then, a test was conducted using the absorbent article according to Example 12.
-Upper layer non-woven fabric: Hydrophilic fibers are used, and the fiber composition is 1.2 dtex PET / PE: 70%, 2.0 dtex PET / PE: 30%, basis weight 10 g / m ^2, and size 50. It was set to × 150 mm. The average fiber diameter is 1.2 dtex × 70% + 2.0 dtex × 30% = 1.44 dtex.
-Lower layer non-woven fabric: Hydrophilic fibers were used, and the fiber composition was 4.0 dtex PET / PE: 100%, the basis weight was 25 g / m ² , and the size was 50 × 150 mm. The average fiber diameter is 4.0 dtex.
・ Metsuke of liquid permeable surface sheet: 35g / m ²
Absorber: The layer composition was 15.5 g of tissue, 50 g of SAP, 139 g of pulp, and 15.5 g of tissue, and the overall basis weight was 220 g / m ² . However, it was not embossed.
-Aperture ratio of the opening of the liquid-permeable surface sheet: 12.5%
・ Thickness of absorbent article: 2.0 mm

As a test, the absorption rate, the absorption amount, the reversion rate after 20 seconds, the reversion rate after 1 minute (3 ml), and the reversion rate after 5 minutes of the viscous liquid were measured in the same manner as in Example 1. The results are shown in Table 1 below.

(3.13) Example 13
As the absorbent article according to Example 13, the upper layer non-woven fabric, the lower layer non-woven fabric and the absorber were composed of the following configurations, and the impermeable back sheet was composed of a polyethylene film. Then, a test was conducted using the absorbent article according to Example 13.
-Upper layer non-woven fabric: Hydrophilic fibers were used, and the fiber composition was 1.2 dtex PET / PE: 100%, the basis weight was 13 g / m ² , and the size was 50 x 150 mm. The average fiber diameter is 1.2 dtex.
-Lower layer non-woven fabric: Hydrophilic fibers were used, and the fiber composition was 6.0 dtex PET / PE: 100%, the basis weight was 22 g / m ² , and the size was 50 × 150 mm. The average fiber diameter is 6.0 dtex.
・ Metsuke of liquid permeable surface sheet: 35g / m ²
Absorber: The layer composition was 15.5 g of tissue, 50 g of SAP, 139 g of pulp, and 15.5 g of tissue, and the overall basis weight was 220 g / m ² . However, it was not embossed.
-Opening ratio of the opening of the liquid-permeable surface sheet: 5%
・ Thickness of absorbent article: 1.2 mm

As a test, the absorption rate, the absorption amount, the reversion rate after 20 seconds, the reversion rate after 1 minute (3 ml), and the reversion rate after 5 minutes of the viscous liquid were measured in the same manner as in Example 1. The results are shown in Table 1 below.

(3.14) Comparative Example 1
As the absorbent article according to Comparative Example 1, the upper non-woven fabric, the lower non-woven fabric and the absorbent body were composed of the following configurations, and the impermeable back sheet was composed of a polyethylene film. Then, a test was conducted using the absorbent article according to Comparative Example 1.
-Upper layer non-woven fabric: Hydrophilic fibers are used, and the fiber composition is 1.2 dtex PET / PE: 50%, 2.0 dtex PET / PE: 50%, basis weight is 10 g / m ^2, and size is 50. It was set to × 150 mm. The average fiber diameter is 1.2 dtex × 50% + 2.0 dtex × 50% = 1.6 dtex.
-Lower layer non-woven fabric: Hydrophilic fibers were used, and the fiber composition was 4.0 dtex PET / PE: 100%, the basis weight was 25 g / m ² , and the size was 50 × 150 mm. The average fiber diameter is 4.0 dtex.
・ Metsuke of liquid permeable surface sheet: 35g / m ²
Absorber: The layer composition was 15.5 g of tissue, 75 g of SAP, 44 g of pulp, and 15.5 g of tissue, the overall basis weight was 150 g / m ² , and the entire surface was embossed.
-Aperture ratio of the opening of the liquid-permeable surface sheet: 0% (no opening)
-Thickness of absorbent article: 1.55 mm

As a test, the absorption rate, the absorption amount, the reversion rate after 20 seconds, the reversion rate after 1 minute (3 ml), and the reversion rate after 5 minutes of the viscous liquid were measured in the same manner as in Example 1. The results are shown in Table 1 below.

(3.15) Comparative Example 2
As the absorbent article according to Comparative Example 2, the upper layer non-woven fabric, the lower layer non-woven fabric and the absorber were composed of the following constitutions, and the impermeable back sheet was composed of a polyethylene film. Then, a test was conducted using the absorbent article according to Comparative Example 2.
-Upper layer non-woven fabric: Hydrophilic fibers were used, and the fiber composition was 1.2 dtex PET / PE: 100%, the basis weight was 13 g / m ² , and the size was 50 x 150 mm. The average fiber diameter is 1.2 dtex.
-Lower layer non-woven fabric: Hydrophilic fibers are used, and the fiber composition is 6.0 dtex PET / PE: 30%, 2.0 dtex PET / PE: 70%, basis weight 22 g / m ^2, and size 50. It was set to × 150 mm. The average fiber diameter is 6.0 dtex × 30% + 2.0 dtex × 70% = 3.2 dtex.
・ Metsuke of liquid permeable surface sheet: 35g / m ²
Absorber: The layer composition was 15.5 g of tissue, 75 g of SAP, 44 g of pulp, and 15.5 g of tissue, the overall basis weight was 150 g / m ² , and the entire surface was embossed.
-Opening ratio of the opening of the liquid-permeable surface sheet: 5%
-Thickness of absorbent article: 1.45 mm

As a test, the absorption rate, the absorption amount, the reversion rate after 20 seconds, the reversion rate after 1 minute (3 ml), and the reversion rate after 5 minutes of the viscous liquid were measured in the same manner as in Example 1. The results are shown in Table 1 below.

(3.16) Comparative Example 3
As the absorbent article according to Comparative Example 3, the upper non-woven fabric, the lower non-woven fabric and the absorbent body were composed of the following configurations, and the impermeable back sheet was composed of a polyethylene film. Then, a test was conducted using the absorbent article according to Comparative Example 3.
-Upper layer non-woven fabric: As the fiber composition, 1.2 dtex water-repellent PET / PE: 30%, 2.0 dtex hydrophilic PET / PE: 70%, basis weight was 10 g / m ^2, and size was 50 x 150 mm. .. The average fiber diameter is 1.2 dtex × 30% + 2.0 dtex × 70% = 1.76 dtex.
-Lower layer non-woven fabric: Hydrophilic fibers were used, and the fiber composition was 4.0 dtex PET / PE: 100%, the basis weight was 13 g / m ² , and the size was 50 × 150 mm. The average fiber diameter is 4.0 dtex.
・ Metsuke of liquid permeable surface sheet: 23g / m ²
Absorber: The layer composition was 15.5 g of tissue, 75 g of SAP, 44 g of pulp, and 15.5 g of tissue, the overall basis weight was 150 g / m ² , and the entire surface was embossed.
-Aperture ratio of the opening of the liquid-permeable surface sheet: 12.5%
-Thickness of absorbent article: 1.75 mm

As a test, the absorption rate, the absorption amount, the reversion rate after 20 seconds, the reversion rate after 1 minute (3 ml), and the reversion rate after 5 minutes of the viscous liquid were measured in the same manner as in Example 1. The results are shown in Table 1 below.

(3.17) Result

As shown in Table 1, from Example 1-13 and Comparative Example 1-3, the absorption rate is effectively improved while suppressing the reversion that occurs 1 minute after the absorption of 1 ml of physiological saline to a certain extent. For this purpose, the liquid-permeable surface sheet is composed of a hydrophilic upper-layer non-woven fabric and a hydrophilic lower-layer non-woven fabric, and the liquid-permeable surface sheet is provided with a plurality of openings penetrating the upper-layer non-woven fabric and the lower-layer non-woven fabric. The upper layer nonwoven fabric has an average fiber diameter of 1 dtex or more and 2 dtex or less, and is configured to include a protruding portion that projects from the peripheral edge of each of the plurality of openings toward the absorber and the tip thereof contacts the absorber. It was demonstrated that it is effective to set the average fiber diameter of the non-woven fabric to 4 dtex or more and 6 dtex or less.

Comparing Example 1 and Example 2-13, in Example 1, the absorber contained 19.2 g of PP / PE, whereas in Example 2-13, the absorber contained PP / PE. However, in each of Examples 2-13, the evaluations of "reversion 20 seconds", "3 ml reversion 1 minute", and "viscous reversion" are good. Therefore, in an absorbent article, the smaller the amount of heat-sealed fibers contained in the absorber, the more effectively the reversion after absorbing the body fluid can be prevented, and the more effectively the reversion is performed if the heat-sealed fibers are not contained. We were able to demonstrate that it can be prevented.

Comparing Examples 2-8 and 9-13, in Example 2-8, the absorber has an embossed portion, whereas in Example 9-13, the absorber has an embossed portion. Where there is no, in each of Examples 2-8, the absorption amount is "⊚". Therefore, in an absorbent article, it was demonstrated that the amount of absorption can be effectively increased when the absorber has an embossed portion.

The aperture ratio differs from the relationship between Example 2 and Example 3, the relationship between Example 4 and Example 5, the relationship between Example 9 and Example 10, and the relationship between Example 11 and Example 12. Has a certain effect on the absorption rate, and in particular, it has been found that the absorption rate tends to increase as the aperture ratio increases.

From the results of Examples 1-13, an absorbent article that effectively improves the absorption rate while suppressing reversion to a certain degree can be obtained in an amount of 2.5 mm or less without providing a second sheet on the liquid permeable surface sheet and the absorber. I was able to demonstrate that it can be realized with.

1 Absorbent article 2 Liquid-permeable front sheet 21 Upper-layer non-woven fabric 22 Lower-layer non-woven fabric 23 Opening 24 Protruding part 3 Impermeable back sheet 4 Absorbent

Claims (7)

A liquid-permeable surface sheet that is placed so that it faces the user's skin,
The impermeable back sheet arranged on the back side of the liquid permeable front sheet and
An absorber arranged between the liquid-permeable front sheet and the impermeable back sheet,
Absorbent article to be prepared
The liquid-permeable surface sheet is
The hydrophilic upper non-woven fabric arranged on the skin side and
A hydrophilic lower-layer non-woven fabric that is arranged on the impermeable back sheet side with respect to the upper-layer non-woven fabric and is integrated with the upper-layer non-woven fabric without an adhesive layer.
Have,
The liquid-permeable surface sheet is
A plurality of openings penetrating the upper-layer non-woven fabric and the lower-layer non-woven fabric, and
A protrusion that projects from the peripheral edge of each of the plurality of openings toward the absorber and the tip thereof contacts the absorber.
Including
The average fiber diameter of the upper layer non-woven fabric is 1 dtex or more and 2 dtex or less.
The average fiber diameter of the lower layer non-woven fabric is 4 dtex or more and 6 dtex or less.
Absorbent article. The amount of heat-sealed fibers contained in the absorber is less than a predetermined ratio.
The absorbent article according to claim 1. The absorber does not contain the heat-sealed fibers,
The absorbent article according to claim 2. The absorber has an embossed portion that has been embossed.
The absorbent article according to any one of claims 1 to 3. The aperture ratio of the plurality of openings is 3% or more and 15% or less.
The absorbent article according to any one of claims 1 to 4. The basis weight of the liquid-permeable surface sheet is 20 g / m ² or more and 45 g / m ² or less.
The absorbent article according to any one of claims 1 to 5. The thickness of the absorbent article is 2.5 mm or less.
The absorbent article according to any one of claims 1 to 6.

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