JP2022156176A - Sheet for absorbent article and absorbent article including the same - Google Patents

Abstract

To provide a high leakproof sheet for absorbent articles regardless of being constituted of a nonwoven fabric.SOLUTION: A sheet 10 for absorbent articles is formed by laminating a plurality of nonwoven fabric layers. The absorbent article sheet 10 includes at least one surface 21 having an uneven structure. The absorbent article sheet 10 has water repellency with respect to liquid with surface tension of 60 mN/m. The width W of a projection part 11 in the uneven structure is preferably 0.5 mm or more and 8 mm or less. The nonwoven fabric layer preferably includes a nanofiber layer 14 using a fiber with a fiber diameter of 1 μm or less as a constituent fiber. It is preferable that the nanofiber layer 14 has an uneven structure.SELECTED DRAWING: Figure 7

Description

The present invention relates to a sheet for absorbent articles. The present invention also relates to an absorbent article provided with a sheet for absorbent articles.

A technique of using a nonwoven fabric having an uneven surface as a constituent member of an absorbent article is known. For example, US Pat. No. 6,200,000 describes a laminated material composed of a first substantially non-stretchable layer and a second layer. The second layer and the first layer are attached with a plurality of spaced apart adhesive areas. The laminate material thereby has a plurality of bonded areas and non-bonded areas, and a bulky pillow is formed in the laminate material. This laminate material is used as a backsheet for absorbent articles.

Patent Document 2 describes that a spunbond-meltblown-meltblown-spunbond nonwoven fabric is given a honeycomb-shaped pattern (tortoise shell concave pattern) by embossing, and the center of the tortoise shell concave pattern is raised. This nonwoven fabric is used as leg cuffs for absorbent articles.

JP-A-6-255006 Japanese Patent Application Laid-Open No. 2004-129810

As described above, the nonwoven fabrics described in Patent Literatures 1 and 2 are used for members required to be leak-proof among constituent members of absorbent articles. However, the nonwoven fabrics described in these documents do not have sufficient leakproof properties in situations where liquid leakage is likely to occur, such as when the wearer moves while the absorbent article is worn by the wearer.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an absorbent article sheet capable of overcoming the above-described drawbacks of the prior art.

The present invention relates to a sheet for absorbent articles in which a plurality of nonwoven fabric layers are laminated,
At least one surface of the sheet has an uneven structure,
Provided is a sheet for absorbent articles having water repellency against a liquid having a surface tension of 60 mN/m.

The sheet for absorbent articles of the present invention is highly leak-proof even though it is made of nonwoven fabric. Therefore, even if a wearer moves while wearing an absorbent article having this absorbent article sheet, the liquid hardly seeps out through the absorbent article sheet.

FIG. 1 is an explanatory diagram showing the width, pitch and height of convex portions in the sheet for absorbent articles of the present invention. FIG. 2 is a perspective view showing one embodiment of the sheet for absorbent articles of the present invention. FIG. 3 is a perspective view showing another embodiment of the absorbent article sheet of the present invention. FIGS. 4(a) to 4(c) are schematic diagrams showing cross-sectional structures in the thickness direction of the sheet for absorbent articles of the present invention. FIG. 5 is a schematic diagram showing a cross-sectional structure in the thickness direction of the sheet for absorbent articles of the present invention. FIGS. 6A and 6B are schematic diagrams showing cross-sectional structures in the thickness direction of the sheet for absorbent articles of the present invention. FIGS. 7A and 7B are schematic diagrams showing cross-sectional structures in the thickness direction of the sheet for absorbent articles of the present invention. FIG. 8 is a schematic diagram showing a cross-sectional structure in the thickness direction of the sheet for absorbent articles of the present invention. FIGS. 9A and 9B are schematic diagrams showing cross-sectional structures in the thickness direction of the sheet for absorbent articles of the present invention. FIG. 10 is a schematic diagram showing the cross-sectional structure in the thickness direction of the sheet for absorbent articles of the present invention. FIG. 11 is a schematic diagram showing an example of a suitable apparatus used for manufacturing the sheet for absorbent articles of the present invention. FIG. 12 is a schematic diagram showing an example of another suitable apparatus used for manufacturing the sheet for absorbent articles of the present invention. FIGS. 13(a) to 13(d) are schematic diagrams showing an example of another preferred apparatus used to produce the sheet for absorbent articles of the present invention, and show a sheet manufacturing process using the apparatus. It is a schematic diagram. FIGS. 14(a) to 14(e) are schematic diagrams showing an example of another preferred apparatus used for producing the sheet for absorbent articles of the present invention, and show the process of producing the sheet using the apparatus. It is a schematic diagram. FIG. 15 is a schematic diagram showing an example of another suitable apparatus used for manufacturing the sheet for absorbent articles of the present invention. FIG. 16 is a schematic diagram showing an example of another suitable apparatus used for manufacturing the sheet for absorbent articles of the present invention.

The present invention will be described below based on its preferred embodiments.
The absorbent article sheet of the present invention (hereinafter also simply referred to as "sheet") is a fiber sheet made of nonwoven fabric. The sheet of the present invention is used as a constituent member of absorbent articles. The sheet of the present invention is a fiber sheet and does not have a liquid-impermeable layer film.
Absorbent articles in which the sheet of the present invention is used generally have a longitudinal shape having a longitudinal direction corresponding to a direction extending from the wearer's abdominal side to the dorsal side through the crotch and a width direction orthogonal thereto. ing. The absorbent article has a crotch part arranged in the wearer's crotch part, and an abdominal part and a back part extending in the front and rear of the crotch part. The crotch portion has an excretion-part facing portion that is arranged to face the wearer's excretory part when the absorbent article is worn. located in

Absorbent articles generally include a topsheet positioned on the wearer's skin-facing side, a backsheet positioned on the non-skin-facing side, and an absorbent core interposed between the two sheets. As the surface sheet, a liquid-permeable sheet such as a nonwoven fabric or a perforated film can be used. The surface sheet may have an uneven surface on the side facing the skin. For example, a plurality of projections can be formed in a scattered pattern on the side of the surface facing the skin of the topsheet. Alternatively, ridges and grooves extending in one direction may be alternately formed on the surface of the topsheet facing the skin. For such purposes, two or more nonwoven fabrics may be used to form the topsheet. On the other hand, as the back sheet, for example, a liquid-impermeable nonwoven fabric or the like can be used.

The absorbent body has an absorbent core. The absorbent core is, for example, a pile of hydrophilic fibers such as cellulose such as pulp, a mixed pile of hydrophilic fibers and an absorbent polymer, a pile of absorbent polymer, or between two absorbent sheets. It is composed of a laminated structure in which an absorbent polymer is carried in the body. At least the skin-facing surface of the absorbent core may be covered with a liquid-permeable core-wrap sheet, or the entire surface including the skin-facing surface and the non-skin-facing surface may be covered with the core-wrap sheet. . As the core wrap sheet, for example, a thin paper made of hydrophilic fibers, a liquid-permeable nonwoven fabric, or the like can be used. As will be described later, the sheet of the present invention is preferably used as a backsheet.

In addition to the above-described topsheet, backsheet, and absorbent body, leakage-preventing cuffs extending in the longitudinal direction are arranged on both sides along the longitudinal direction on the side facing the skin, depending on the specific use of the absorbent article. Sometimes. A leak-tight cuff generally has a proximal end and a free end. The leak-proof cuff has a base end on the skin-facing side of the absorbent article and stands up from the skin-facing side. The leak-tight cuff is constructed from a liquid-resistant or water-repellent and breathable material. The sheet of the present invention is suitable for use as a leak-proof cuff. An elastic member made of rubber thread or the like may be arranged in a stretched state at or near the free end of the leak-proof cuff. When the absorbent article is worn, the contraction of the elastic member causes the leak-proof cuff to stand up toward the wearer's body, and the liquid excreted on the top sheet flows along the top sheet and becomes absorbent. Leakage to the outside in the width direction of the article is effectively prevented.

The absorbent article may further have an adhesive layer on the surface of the non-skin facing surface. The pressure-sensitive adhesive layer is used to fix the absorbent article to underwear or another absorbent article while the absorbent article is worn.

Examples of the absorbent article having the above configuration include, but are not limited to, a spreadable disposable diaper, a pants-type disposable diaper, a sanitary napkin, an incontinence pad, and the like.

The sheet of the present invention is suitable for use in members that require leakproofness among constituent members of absorbent articles because of its high leakproofness. For example, the sheet of the present invention can be used as a backsheet. Alternatively, the sheet of the present invention can be used as a leak-proof cuff.

The sheet of the present invention has a structure in which a plurality of nonwoven fabric layers are laminated. Furthermore, the sheet of the present invention preferably has an uneven structure on at least one surface.
One of the characteristics of the sheet of the present invention is its high water repellency. Specifically, the sheet of the present invention preferably has water repellency against liquids with a surface tension of 60 mN/m (hereinafter also referred to as "low surface tension liquids"), and is resistant to liquids with a surface tension of 50 mN/m. It is more preferable to have water repellency against a liquid having a surface tension of 40 mN/m. By having such water repellency, the sheet of the present invention exhibits high leakproofness. In order for the sheet of the present invention to exhibit such water repellency, at least one surface of the sheet preferably has an uneven structure, as described above. In order for the sheet of the present invention to exhibit such water repellency, it is advantageous for the sheet to have a nanofiber layer, which will be described later. A water repellent agent may be applied to the sheet of the present invention for the purpose of further enhancing water repellency. The details of the water repellent will be described later.
Since the surface tension depends on the temperature, the values of the surface tension mentioned above are those at 25°C.

Whether or not the sheet of the present invention has water repellency against a low surface tension liquid is judged by the following method.
As a low surface tension liquid, a "wet tension test mixed liquid" available from Kanto Kagaku Co., Ltd. is prepared.
A sheet of the present invention having an area capable of covering the entire area of the filter paper is placed on the filter paper having a diameter of 7 cm. A dry pulp sheet (basis weight: 44 g/m ² ) cut into the same size as the sheet is placed on the sheet of the present invention. 1 g of the low surface tension liquid is dropped on the center of the dry pulp sheet, and an acrylic resin plate with a diameter of 6 cm is placed at the dropping position. A weight is placed on this plate so that a pressure of 2 kPa is applied to the sheet of the invention. After applying this pressure for 1 hour, the filter paper is taken out and the area of the low surface tension liquid adhering to the filter paper is measured. For measuring the area, for example, a method of taking a photograph of the filter paper or scanning it with a scanner and binarizing the image obtained thereby by image analysis software can be adopted. If the area ratio (%) obtained by dividing the area thus measured by the area of the filter paper and multiplying it by 100 is less than 5%, the sheet is judged to have water repellency. Ten different sheets are measured for the area ratio, and the arithmetic average value thereof is taken as the area ratio value.

In the sheet of the present invention, it is preferable that the width of the protrusions in the uneven structure formed on at least one surface is set within a specific range. The present inventors have found that such a sheet has an excellent ability to prevent liquid permeation.
The width of the protrusions of the uneven structure is defined according to the form of the uneven structure. For example, as shown in FIG. 2, which will be described later, when the convex portions are arranged in a scattered pattern, the width of the convex portion starts from the most recessed portion located between the convex portions. The straight line distance (straight line distance when the sheet is viewed from the top) between the start point and the end point, when the end point is a depression that passes through the top of the convex portion in the sheet's plan view and is located opposite to the start point. means that
On the other hand, as shown in FIG. 3, which will be described later, for example, when the convex portion is formed in a streaky shape extending continuously along one direction, the width of the convex portion is perpendicular to the direction in which the convex portion extends. The starting point is the most recessed portion in the thickness direction located between the convex portions in the direction, and the end point is the recessed portion at the position facing the starting point that passes through the top of the convex portion in the plan view of the sheet. , it means the straight-line distance between the start point and the end point (straight-line distance when the sheet is viewed from above).

Regardless of the shape of the uneven structure, the width of the protrusion is preferably 0.5 mm or more from the viewpoint of ease of formation of the uneven structure, and from this point of view, the width of the protrusion is more preferably 1 mm or more. , 1.5 mm or more.
On the other hand, it is preferable that the width of the protrusions is 8 mm or less from the viewpoint that the protrusions are less likely to be crushed and the uneven structure can be stably maintained. From the viewpoint of making this advantage even more remarkable, the width of the protrusion is more preferably 6 mm or less, and even more preferably 4 mm or less.
Summarizing the above, the width of the protrusion is preferably 0.5 mm or more and 8 mm or less, more preferably 1 mm or more and 6 mm or less, and even more preferably 1.5 mm or more and 4 mm or less.

The width W of the protrusion is measured by the following method.
As shown in FIG. 1, the sheet is cut along the thickness direction so that the convex portions 11 and the concave portions 12 are arranged alternately, and the cut sheet is placed on a smooth table so that the convex portions 11 face upward. put. A flat plate is placed on the sheet and a pressure of 49 Pa is applied. The shortest straight line from the most recessed portion of the recess 12 through the top of the protrusion to the most recessed portion of the adjacent recess 12. Distance (length of line segment parallel to platform) is measured with a microscope. When the concave portion 12 is an embossed portion (fused portion), it is the distance from the edge of the embossed portion closest to the convex portion 11 to the opposite edge of the embossed portion (edge of the embossed portion closest to the convex portion). . Five different cross-sections are used as measurement targets, and the distance is measured at three positions for each cross-section. An arithmetic mean of the total 15 measured values is calculated, and the value is defined as the width W of the convex portion 11 . Calculations are made in millimeters and rounded off to the first decimal place.

In the sheet of the present invention, the uneven structure is observed without applying pressure to the sheet. In addition to this, it is preferable from the viewpoint of enhancing the leakproof property that the uneven structure is observed even when a pressure of 49 Pa is applied to the sheet of the present invention.

If the sheet of the present invention has an uneven structure on at least one surface, it is possible to sufficiently prevent liquid permeation. Therefore, the other surface may be a flat surface or a surface having an uneven structure.

The sheet of the present invention may have, for example, a form in which convex portions are arranged in a scattered manner on one surface of the sheet, and concave portions are located between adjacent convex portions. Specifically, in one surface of the sheet of the present invention, convex portions and concave portions are alternately arranged along one direction, and convex portions and concave portions are arranged along a direction orthogonal to the one direction. It may be in a form in which the recesses are alternately arranged. An example of such a sheet is shown in FIG. In the sheet 10 shown in FIG.

In the sheet 10 having the form shown in FIG. 2, the shape of the protrusions 11 in plan view includes, for example, circular and elliptical shapes; polygonal shapes such as triangular, quadrangular and hexagonal shapes; and combinations thereof. The shape of each projection 11 in plan view may be the same or may be different.
On the other hand, in the sheet 10 having the form shown in FIG. 2, the shape of the concave portion 12 in plan view includes, for example, circular and elliptical shapes; polygonal shapes such as triangular, quadrangular and hexagonal shapes;

As another embodiment of the sheet of the present invention, on one surface of the sheet, convex portions continuously extending in a streak-like manner along one direction in the surface and streak-like portions continuously extending in the one direction and recesses extending in a direction perpendicular to the one direction are arranged alternately. An example of such a sheet is shown in FIG. In the sheet 10 shown in FIG.

In any of the embodiments of the sheet of the present invention shown in FIGS. 2 and 3, it is preferable that the pitch of the protrusions is 1 mm or more from the viewpoint of ease of formation of the uneven structure. From the viewpoint of making this advantage more remarkable, the pitch of the protrusions is more preferably 1.5 mm or more, and even more preferably 2 mm or more.
On the other hand, if the pitch of the protrusions is 10 mm or less, the number of protrusions and recesses that can be provided per unit area can be sufficiently increased, and the protrusions are less likely to be crushed, thereby stably maintaining the uneven structure. It is preferable from the viewpoint of obtaining. From the viewpoint of making this advantage even more remarkable, the pitch of the projections is more preferably 9 mm or less, and even more preferably 8 mm or less.
Summarizing the above, the pitch of the protrusions is preferably 1 mm or more and 10 mm or less, more preferably 1.5 mm or more and 9 mm or less, and even more preferably 2 mm or more and 8 mm or less.

The pitch of the protrusions means the distance between the apexes of adjacent protrusions in any of the embodiments shown in FIGS. 2 and 3 of the sheet of the present invention. If the pitch is not constant, the arithmetic average value is used as the pitch of the convex portions.

The pitch P of the protrusions is measured by the following method.
As shown in FIG. 1, the sheet is cut along the thickness direction so that the convex portions 11 and the concave portions 12 are arranged alternately, and the cut sheet is placed on a smooth table so that the convex portions 11 face upward. put. A flat plate is placed on the sheet and a pressure of 49 Pa is applied. and the length of a line segment parallel to ) is measured with a microscope. Five different cross-sections are used as measurement targets, and the distance is measured at three positions for each cross-section. The arithmetic mean of the total 15 measured values is calculated, and the value is taken as the pitch P of the convex portions 11 . Calculations are made in millimeters and rounded off to the first decimal place.

In any of the embodiments shown in FIGS. 2 and 3 for the sheet of the present invention, the protrusions in the sheet may be solid or hollow inside. That the inside of the projection is solid means that the inside of the projection is filled with fibers. The fact that the inside of the projection is hollow means that there is a space inside the projection.
When the inside of the convex portion is hollow, the space inside the convex portion blocks the permeation of liquid, so there is an advantage that the leakproofness of the sheet of the present invention is improved. On the other hand, when the inside of the convex portion is solid, there is an advantage that the seat of the present invention is imparted with a cushion feeling and an advantage that the convex portion is hard to collapse.

Regardless of whether the projections in the sheet of the present invention are solid or hollow, the height of the projections in the sheet is 0.5 mm or more from the viewpoint of imparting high leakproofness to the sheet. is preferred, 0.7 mm or more is more preferred, and 0.9 mm or more is even more preferred.
The height of the projections is preferably 5 mm or less, more preferably 4 mm or less, and even more preferably 3 mm or less. By making the protrusion lower than this value, it is possible to effectively suppress excessive crushing of the protrusion due to pressure resistance of the wearer when the absorbent article is worn.
Summarizing the above viewpoints, the height of the convex portion is preferably 0.5 mm or more and 5 mm or less, more preferably 0.7 mm or more and 4 mm or less, and even more preferably 0.9 mm or more and 3 mm or less. .

The height H of the convex portion is measured by the following method.
As shown in FIG. 1, the sheet is cut along the thickness direction so that the convex portions 11 and the concave portions 12 are arranged alternately, and the cut sheet is placed on a smooth table so that the convex portions 11 face upward. put. A flat plate is placed on the sheet, and under a pressure of 49 Pa, a virtual line is drawn parallel to the plate and the base through the top of the recess 12 . Measure the distance between the imaginary line and the bottom surface of the plate with a microscope. Five different cross-sections are used as measurement targets, and the distance is measured at three positions for each cross-section. The arithmetic mean of the total 15 measured values is calculated, and this value is taken as the height H of the convex portion 11 . Calculations are made in millimeters and rounded to the first decimal place.

As described above, the sheet of the present invention has a structure in which a plurality of nonwoven fabric layers are laminated, and the plurality of nonwoven fabric layers preferably include at least a nanofiber layer. A nanofiber layer is a layer formed by depositing nanofibers. In the present specification, nanofibers generally refer to fibers having a thickness of 0.01 μm or more and 3 μm or less when the diameter is expressed as a circle-equivalent diameter.

The nanofiber layer can be, for example, a meltblown layer. Also, the nanofiber layer can be, for example, an electrospun layer.
The meltblown layer is a layer of nonwoven fabric produced by the meltblown method. Specifically, the melt of a raw material resin having fiber-forming ability is stretched with hot air to form fibers, and the fibers are spread on the collector. It is a layer of nonwoven fabric produced by depositing a
An electrospinning layer is a nonwoven fabric layer produced by an electrospinning method. Specifically, a solution or melt of a resin having fiber-forming ability is charged and ejected into an electric field, and ejected by the electric field. It is a layer of non-woven fabric produced by stretching a liquid to form fibers and depositing the fibers on a collector.
Either the meltblown method or the electrospinning method can easily produce nanofibers having the thickness described above.

The nanofiber layer is preferably composed of fibers having a fiber diameter of 1 μm or less. In particular, the inventors have found that a nonwoven fabric sheet having a nanofiber layer with an uneven structure on the surface is more excellent in the ability to block liquid permeation. The present inventor believes that the reason for this is that the synergistic action of the nanofiber layer composed of thin fibers and the uneven surface structure prevents liquid permeation. However, the present invention is not bound by this theory.

From the viewpoint of further improving leakproofness, the fiber diameter of the constituent fibers of the nanofiber layer is preferably 1 μm or less, more preferably 0.9 μm or less, as described above. The lower limit of the fiber diameter is not particularly limited, and the thinner the fiber, the higher the leakproofness of the sheet of the present invention.
Considering the above points, the fiber diameter of the constituent fibers of the nanofiber layer is preferably 0.4 μm or more and 1 μm or less, more preferably 0.4 μm or more and 0.9 μm or less.
In order to produce a nanofiber layer made of fibers with a fiber diameter of 1 μm or less by, for example, a meltblown method, conditions such as the temperature and discharge rate of the resin during production, the temperature of the hot air, the air volume and air velocity, the temperature of the spinning die, and the nozzle diameter. can be adjusted appropriately, and the setting of those conditions is within the scope of common technical knowledge of those skilled in the art.

The fiber diameter of the constituent fibers of the nanofiber layer is measured by the following method.
Randomly pick 5 small piece samples from the nanofiber layer. Next, using a scanning electron microscope, a photograph magnified 1000 to 10000 times so that 20 to 60 fibers of the nanofiber layer can be seen in the field of view is taken. Measure the fiber diameters of 100 or more fibers so that each fiber in the field of view is counted once, calculate the average value in micrometer order, and round off to the second decimal place. The value thus obtained is taken as the fiber diameter of the constituent fibers of the nanofiber layer.

When the sheet of the present invention has a nanofiber layer, the basis weight of the nanofiber layer is preferably 1 g/m ² or more, more preferably 1.5 g/m ² or more, from the viewpoint of further enhancing the leakproofness of the sheet. and more preferably 2 g/m ² or more. The higher the basis weight of the nanofiber layer, the higher the leakproofness. However, from the viewpoint of the feel of the sheet and economy, the nanofiber layer is preferably 10 g/m ² or less, more preferably 9 g/m ² or less. , 8 g/m ² or less.
Summarizing these, the basis weight of the nanofiber layer is preferably 1 g/m ² or more and 10 g/m ² or less, more preferably 1.5 g/m ² or more and 9 g/m ² or less, and 2 g/m 2 or more. More preferably, it is m ² or more and 8 g/m ² or less.

The basis weight of the nanofiber layer is measured by the following method.
A 10 cm x 10 cm specimen is cut from the sheet of the invention using a razor blade. If it is not possible to cut a specimen of this size, cut a specimen of as large an area as possible. Carefully remove the nanofiber layer from the specimen with a hand or tweezers. The weight of the nanofiber is measured and divided by the area of the test piece to obtain the basis weight of the nanofiber layer.

In relation to the basis weight described above, the thickness of the nanofiber layer is preferably 3 μm or more and 150 μm or less, more preferably 10 μm or more and 120 μm or less, from the viewpoint of further enhancing the leakproofness of the sheet of the present invention. , 15 μm or more and 100 μm or less.

The thickness of the nanofiber layer is measured by the following method.
The sheet of the present invention is cut along the thickness direction with a razor or the like so that convex portions and concave portions are arranged alternately, and a nanofiber layer is observed in the center of the field of view with a scanning electron microscope, and layers adjacent to the nanofiber layer above and below it are observed. Take a photograph magnified 150 to 1000 times so that the
A demarcation line is drawn between the nanofiber layer and its adjacent layers based on the difference in fiber diameter.
The shortest linear distance between two boundary lines sandwiching the nanofiber layer is measured.
This operation is performed for 10 different cross-sections, and the arithmetic mean value of the measured values of 10 points in total, 1 point per 1 cross-section, is calculated. The average value is calculated in micrometer order and rounded off to the first decimal place.

The constituent fibers of the nanofiber layer are preferably made of a thermoplastic resin having fiber-forming ability. The constituent fibers of the nanofiber layer are preferably composed of, for example, polyolefin such as polypropylene, polyethylene, ethylene-α-olefin copolymer, polyester such as polyethylene terephthalate, and the like. From the viewpoint of easily producing a nanofiber layer with a small fiber diameter, it is preferable to use polypropylene.

Sheets of the present invention preferably comprise other nonwoven layers in addition to the nanofiber layer. Other nonwoven fabric layers are used for the purpose of, for example, providing the sheet of the present invention with a good texture, providing an uneven structure on the surface of the sheet of the present invention, and supporting the nanofiber layer. Other non-woven fabric layers include layers manufactured by various non-woven fabric manufacturing methods, such as spunbond layers, air-through layers, air-laid layers, spunlace layers, and needle-punched layers. In addition, it is preferable that the other nonwoven fabric layer has elasticity from the viewpoint of improving followability when the wearer moves while wearing the absorbent article having the sheet of the present invention.

When the sheet of the present invention has a nanofiber layer, the nanofiber layer is preferably a meltblown layer, and the meltblown layer preferably has a spunbond layer disposed on at least one surface thereof. As described above, since the meltblown layer is composed of fine fibers, its strength tends to be low. Therefore, by disposing a spunbond layer adjacent to the meltblown layer on at least one surface of the meltblown layer, the strength of the meltblown layer is maintained. From this point of view, it is more preferable that the meltblown layer has a spunbond layer disposed adjacent to the meltblown layer on both sides thereof.

In the following description, a laminated structure of a nanofiber layer such as a meltblown layer or an electrospun layer and a pair of spunbond layers arranged adjacent to the nanofiber layer on both sides thereof is referred to as an "SNS layer." Also called

When the sheet of the present invention has an SNS layer, each spunbond layer in the SNS layer may have the same basis weight and/or different thickness. In addition, each spunbond layer in the SNS layer may have the same or different types of resins in the constituent fibers.
The basis weight of each spunbond layer in the SNS layer is preferably 3 g/m ² or more and 50 g/m ² or less, and more preferably 4 g/m ² or more and 40 g/m ² or less. It is more preferably 5 g/m ² or more and 30 g/m ² or less.
Each spunbond layer in the SNS layer has an independent thickness of preferably 50 μm or more and 500 μm or less, more preferably 60 μm or more and 400 μm or less, and even more preferably 70 μm or more and 300 μm or less. The thickness of the spunbond layer is measured by a method similar to the method for measuring the thickness of the nanofiber layer described above.
It is preferable that each spunbond layer in the SNS layer is independently composed of a fiber resin composed of, for example, polypropylene, polyethylene, polyolefin such as ethylene-α-olefin copolymer, polyester such as polyethylene terephthalate, or the like.

When the sheet of the present invention has an SNS layer, the SNS layer (a) may constitute the uneven structure in the sheet of the present invention, or (b) may be present in a part other than the uneven structure. or (c) it constitutes the rugged structure and may be present in a portion other than the rugged structure.
In the case of (a), there is an advantage that the SNS layer itself is less likely to be pulled even if the sheet itself is pulled. Therefore, even when the wearer moves while wearing the absorbent article provided with the sheet of the present invention, the SNS layer is likely to maintain the leakproof property.
In the case of (b), there is an advantage that the sheet can be easily manufactured without destroying the fiber structure of the SNS layer.
In the case of (c), even if the fiber structure of the SNS layer forming the concave-convex structure is destroyed during the production of the sheet, the advantage is that the SNS layer existing in a portion other than the concave-convex structure can ensure leakproofness. There is

FIG. 4(a) schematically shows the cross-sectional structure of the sheet of the present invention in the thickness direction. The seat 10 shown in the figure has a first surface 21 and a second surface 22 located on the opposite side. The first surface 21 side of the sheet 10 has an uneven structure. On the other hand, the second surface 22 is a flat surface.
A single spunbond layer 13 is positioned on the first surface 21 side of the sheet 10 . The spunbond layer 13 constitutes the protrusions 11 and the recesses 12 . The inside of the convex portion 11 is hollow.
The SNS layer 15 composed of the spunbond layer 13 , the nanofiber layer 14 and the spunbond layer 13 is located on the second surface 22 side of the sheet 10 . Each surface of the SNS layer 15 is flat.
The spunbond layer 13 located on the first surface 21 side is joined to the spunbond layer 13 in the SNS layer 15 located on the second surface 22 side at the concave portion 12 thereof. A joint portion 16 is formed by this joining. The shape of the joint portion 16 in plan view can take various shapes according to the shape of the convex portion 11 in plan view. For example, when the convex portion 11 has the shape shown in FIG. 2, the joint portions 16 may be arranged in a scattered manner, such as a circle, an ellipse, a polygon, a cross, or the like. For example, when the convex portion 11 has the shape shown in FIG. 3, the joint portion 16 may be linear, curved, broken line, or the like.
The joint portion 16 is formed by various joining means such as fusion bonding and adhesion.
Since the sheet 10 of the embodiment shown in FIG. 4(a) has the projections 11 and the nanofiber layer 14, it exhibits high leakproofness.

In the sheet 10 shown in FIG. 4B, the SNS layer 15 composed of the spunbond layer 13, the nanofiber layer 14 and the spunbond layer 13 is located on the first surface 21 side. The SNS layer 15 forms the convex portion 11 and the concave portion 12 . The inside of the convex portion 11 is hollow.
A single spunbond layer 13 is positioned on the sheet 10 on the second side 22 side. Each surface of the spunbond layer 13 is flat.
The SNS layer 15 is bonded at its recess 12 to the spunbond layer 13 located on the second surface 22 side. A joint portion 16 is formed by this joining.
Other configurations are the same as those of the embodiment shown in FIG.
Since the sheet 10 of the embodiment shown in FIG. 4(b) has the protrusions 11 and the meltblown layer 14 is located on the protrusions 11, the sheet 10 has a higher resistance than the embodiment shown in FIG. 4(a). It develops leakiness.

In the sheet 10 shown in FIG. 4C, the first SNS layer 15a composed of the spunbond layer 13, the nanofiber layer 14 and the spunbond layer 13 is located on the first surface 21 side. The first SNS layer 15 a constitutes the convex portion 11 and the concave portion 12 . The inside of the convex portion 11 is hollow.
A second SNS layer 15 b is located on the second surface 22 side of the sheet 10 . The second SNS layer 15 b also consists of the spunbond layer 13 , the nanofiber layer 14 and the spunbond layer 13 . Each surface of the second SNS layer 15b is a flat surface.
Other configurations are the same as those of the embodiment shown in FIG.
According to the sheet 10 of the embodiment shown in FIG. 4(c), in addition to the nanofiber layer 14 being positioned on the convex portion 11, the nanofiber layer 14 is also positioned on the second surface 22 side. Therefore, the leakproofness is further enhanced as compared with the embodiment shown in FIG. 4(b).

The sheet of the present invention preferably has an air-through layer. The air-through layer is used for the purpose of imparting good touch to the sheet of the present invention. When the sheet of the present invention is produced by the method shown in FIG. 11, which will be described later, the air-through layer is used for the purpose of imparting unevenness to the surface of the sheet of the present invention.

When the sheet of the present invention includes an air-through layer, the air-through layer can be placed adjacent to the nanofiber layer. For example, an air-through layer can be arranged on one side of the nanofiber layer and adjacent to the nanofiber layer. Alternatively, an air-through layer can be placed adjacent to the nanofiber layer on each side of the nanofiber layer.

When an air-through layer is arranged on each side of the nanofiber layer, each air-through layer may have the same basis weight and/or different thickness. In addition, each air-through layer may have the same or different types of resins in the constituent fibers.
The basis weight of each air-through layer is preferably 6 g/m ² or more and 70 g/m ² or less, more preferably 8 g/m ² or more and 60 g/m ² or less, and 10 g/m ² . It is more preferable that it is more than or equal to 50 g/m ² or less.
The thickness of each air through layer is preferably 0.3 mm or more and 5 mm or less, more preferably 0.4 mm or more and 4 mm or less, and even more preferably 0.5 mm or more and 3 mm or less. The thickness of the air-through layer is measured by the same method as the method for measuring the thickness of the nanofiber layer described above.
It is preferable that the resin of the constituent fibers of each air-through layer is made of, for example, polypropylene, polyethylene, polyolefin such as ethylene-α-olefin copolymer, polyester such as polyethylene terephthalate, or the like. The type of resin of the constituent fibers of each air-through layer may be the same or different. Further, each air-through layer may be composed of core-sheath type composite fibers or side-by-side type composite fibers containing these resins.

FIG. 5 schematically shows the cross-sectional structure of the sheet of the present invention in the thickness direction. The seat 10 shown in the figure has a first surface 21 and a second surface 22 located on the opposite side. The first surface 21 side of the sheet 10 has an uneven structure. On the other hand, the second surface 22 is a flat surface.
The sheet 10 shown in FIG. 5 has a structure in which air-through layers 17a and 17b are arranged on each surface of the nanofiber layer 14. As shown in FIG. Both the nanofiber layer 14 and the pair of air-through layers 17 a and 17 b protrude toward the first surface 21 side to form the protrusions 11 . The inside of the convex portion 11 is solid. The inside of the convex portion 11 is mainly filled with the constituent fibers of the air-through layer 17b located on the second surface 22 side.
Of the pair of air-through layers 17a and 17b, the air-through layer 17b located on the second surface 22 side has a flat outer surface (ie, exposed surface).
The nanofiber layer 14 and the pair of air-through layers 17a, 17b are consolidated in the recess 12 of the sheet 10 and joined together.
The configuration other than these is the same as the embodiment shown in FIG. 4(a) described above.
Since the sheet 10 of the embodiment shown in FIG. 5 has the projections 11 and the nanofiber layer 14 is positioned on the projections 11, it exhibits high leakproofness.

When the sheet of the present invention has an SNS layer, an air through layer is provided on the outer surface of at least one of the pair of spunbond layers in the SNS layer (that is, the surface opposite to the surface facing the nanofiber layer) is also preferably arranged. That is, the sheet of the present invention preferably has an SNS layer and an air-through layer arranged adjacent to the outer surface of at least one spunbond layer in the SNS layer. In the following description, the laminated structure of the SNS layer and the air-through layer arranged adjacent to the outer surface of at least one spunbond layer in the SNS layer is also referred to as "[SNS+AT] layer".

When the sheet of the present invention has a [SNS+AT] layer, the air-through layer in the [SNS+AT] layer may (a) constitute the uneven structure in the sheet of the present invention, or (b) have a structure other than the uneven structure. may be present in the site.
In the case of (a), when the uneven surface is the surface facing the skin, the uneven structure has the advantage of reducing the contact area with the absorbent body and suppressing the adhesion of body fluids to the SNS layer. On the other hand, when the uneven surface is the non-skin-facing surface, there is an advantage that the appearance of the sheet can be given a design. The preferred basis weight of the air-through layer in this case is as described above.
In the case of (b), when the air-through layer is positioned on the skin-facing surface, there is an advantage that the contact area between the absorber and the SNS layer can be reduced. When the air-through layer is positioned on the non-skin-facing surface, there is an advantage that the feel can be improved. The preferred basis weight of the air-through layer in this case is as described above.

FIG. 6(a) schematically shows the cross-sectional structure in the thickness direction of the sheet of the present invention having the [SNS+AT] layer. The seat 10 shown in the figure has a first surface 21 and a second surface 22 located on the opposite side. The first surface 21 side of the sheet 10 has an uneven structure. On the other hand, the second surface is a flat surface.
In the sheet 10 shown in FIG. 6(a), the air-through layer 17 is positioned on the first surface 21 side. The air-through layer 17 constitutes the convex portion 11 and the concave portion 12 . The inside of the convex portion 11 is solid.
The SNS layer 15 is positioned on the second surface 22 side of the sheet 10 . Each surface of the SNS layer 15 is flat.
The air-through layer 17 is compacted and integrally joined with the SNS layer 15 located on the second surface 22 side at the concave portion 12 . A joint portion 16 is formed by this joining.
Other configurations are the same as those of the embodiment shown in FIG.
Since the sheet 10 shown in FIG. 6(a) has the projections 11 and the nanofiber layer 14, it exhibits high leakproofness.

In the sheet 10 shown in FIG. 6(b), the inside of the projections 11 formed by the air-through layer 17 is hollow. Other configurations are the same as those of the embodiment shown in FIG.
In the sheet 10 shown in FIG. 6(b), since the inside of the protrusions 11 is hollow, the liquid permeation blocking property is higher than that of the sheet shown in FIG. 6(a).

FIG. 7(a) schematically shows a cross-sectional structure in the thickness direction of a sheet according to another embodiment of the present invention having [SNS+AT] layers. The seat 10 shown in the figure has a first surface 21 and a second surface 22 located on the opposite side. The first surface 21 side of the sheet 10 has an uneven structure. On the other hand, the second surface is a flat surface.
In the sheet 10 shown in FIG. 7A, the SNS layer 15 is positioned on the first surface 21 side. The SNS layer 15 forms the convex portion 11 and the concave portion 12 .
An air-through layer 17 is positioned on the second surface 22 side of the sheet 10 . The air-through layer 17 has a flat outer surface (that is, an exposed surface). The surface of the air-through layer 17 facing the SNS layer 15 has an uneven structure. This concave-convex structure has a complementary shape to the concave-convex structure formed by the SNS layer 15 . Therefore, the inside of the convex portion 11 is solid, and the inside of the convex portion 11 is filled with the constituent fibers of the air-through layer 17 .
The SNS layer 15 is compacted and integrally joined with the air through layer 17 located on the second surface 22 side at the recess 12 . A joint portion 16 is formed by this joining.
Other configurations are the same as those of the embodiment shown in FIG.
Since the sheet 10 shown in FIG. 7A has the projections 11 and the nanofiber layer 14, it exhibits high leakproofness.

In the sheet 10 shown in FIG. 7( b ), constituent fibers of the air-through layer 17 are present inside the protrusions 11 . However, the constituent fibers of the air-through layer 17 do not completely fill the inside of the convex portion 11, and a space exists inside the convex portion 11, making the inside of the convex portion hollow. Other configurations are the same as those of the embodiment shown in FIG.
In the sheet 10 shown in FIG. 7(b), since the insides of the protrusions 11 are hollow, the liquid permeation blocking property is higher than that of the sheet shown in FIG. 7(a).

FIG. 8 schematically shows a cross-sectional structure in the thickness direction of a sheet according to still another embodiment of the present invention having [SNS+AT] layers. The seat 10 shown in the figure has a first surface 21 and a second surface 22 located on the opposite side. The first surface 21 of the sheet 10 has an uneven structure. On the other hand, the second surface 22 is a flat surface.
The sheet 10 shown in FIG. 8 has a structure in which air-through layers 17 a and 17 b are arranged on each side of the SNS layer 15 . Both the SNS layer 15 and the pair of air-through layers 17 a and 17 b protrude toward the first surface 21 side to form the convex portion 11 . The inside of the convex portion 11 is solid. The inside of the convex portion 11 is mainly filled with the constituent fibers of the air-through layer 17b located on the second surface 22 side.
Of the pair of air-through layers 17a and 17b, the air-through layer 17b located on the second surface 22 side has a flat outer surface (ie, exposed surface).
The SNS layer 15 and the pair of air-through layers 17a and 17b are compacted in the recess 12 of the sheet 10 and integrally joined.
The configuration other than these is the same as the embodiment shown in FIG. 4(a) described above.
Since the sheet 10 of the embodiment shown in FIG. 8 has the projections 11 and the nanofiber layer 14 is positioned on the projections 11, it exhibits high leakproofness.

FIG. 9(a) schematically shows a cross-sectional structure in the thickness direction of a sheet according to still another embodiment of the present invention having [SNS+AT] layers. The seat 10 shown in the figure has a first surface 21 and a second surface 22 located on the opposite side. The first surface 21 side of the sheet 10 has an uneven structure. On the other hand, the second surface is a flat surface.
In the sheet 10 shown in FIG. 9A, the first SNS layer 15a composed of the spunbond layer 13, the nanofiber layer 14 and the spunbond layer 13 is located on the first surface 21 side. The first SNS layer 15 a constitutes the convex portion 11 and the concave portion 12 .
A second SNS layer 15 b is located on the second surface 22 side of the sheet 10 . The second SNS layer 15 b also consists of the spunbond layer 13 , the nanofiber layer 14 and the spunbond layer 13 . Each surface of the second SNS layer 15b is a flat surface.
An air-through layer 17 is arranged between the first SNS layer 15a and the second SNS layer 15b. The air-through layer 17 is positioned within the convex portion 11 so as to fill the entire space of the convex portion 11 defined by the first SNS layer 15a and the second SNS layer 15b. Therefore, the inside of the convex portion 11 is solid, and the inside of the convex portion 11 is filled with the constituent fibers of the air-through layer 17 .
According to the sheet 10 of the embodiment shown in FIG. 9A, in addition to the nanofiber layer 14 being positioned on the convex portion 11, the nanofiber layer 14 is also positioned on the second surface 22 side. Therefore, the leakproofness is further improved.

In the sheet 10 shown in FIG. 9(b), the constituent fibers of the air-through layer 17 are present inside the protrusions 11 defined by the first SNS layer 15a and the second SNS layer 15b. However, the constituent fibers of the air-through layer 17 do not completely fill the inside of the convex portion 11, and a space exists inside the convex portion 11, making the inside of the convex portion hollow. Other configurations are the same as those of the embodiment shown in FIG.
In the sheet 10 shown in FIG. 9(b), since the insides of the projections 11 are hollow, the liquid permeation blocking property is higher than that of the sheet shown in FIG. 9(a).

Figure 10 shows yet another embodiment of the sheet 10 of the present invention. The seat 10 shown in the figure has a first surface 21 and a second surface 22 located on the opposite side. The first surface 21 side of the sheet 10 has an uneven structure. On the other hand, the second surface 22 is a flat surface. The sheet 10 has a first nonwoven fabric layer 23 having an uneven structure on the first surface 21 side. A second nonwoven fabric layer 24 is located on the second surface 22 side. Both nonwoven fabric layers 23 , 24 are joined together at the joint 16 .

The first nonwoven fabric layer 23 in the sheet 10 forms the convex portions 11 and the concave portions 12 . The inside of the convex portion 11 is hollow.
The first nonwoven layer 23 consists of a nanofiber layer or a nonwoven layer containing a nanofiber layer.
If the first nonwoven layer 23 consists of a nanofiber layer, the nanofiber layer is preferably a meltblown layer or an electrospun layer.
On the other hand, when the first nonwoven fabric layer 23 is composed of a nonwoven fabric layer containing a nanofiber layer, the first nonwoven fabric layer 23 is a laminate obtained by laminating a spunbond nonwoven fabric or an air-through nonwoven fabric on one or both surfaces of the nanofiber layer. A non-woven fabric is preferred. Preferably, the nanofiber layer is a meltblown layer or an electrospun layer.

Each surface of the second nonwoven fabric layer 24 positioned on the second surface 22 side of the sheet 10 shown in FIG. 10 is a flat surface.
The second nonwoven layer 24 is preferably a nonwoven containing elastic filaments, and a particularly preferred nonwoven is a nonwoven containing elastic filaments and inelastic fibers.
The second nonwoven layer 24 preferably has elastic filaments 25 bonded in a substantially non-stretched state to nonwovens 26, 26 comprising inelastic fibers. Moreover, it is preferable to have a configuration in which a plurality of elastic filaments 25 are joined to two nonwoven fabrics 26 , 26 .
The plurality of elastic filaments 25 are preferably arranged so as to extend in one direction X without intersecting each other. Each elastic filament 25 may extend linearly or meander as long as it does not cross each other.
Moreover, it is preferable that the plurality of elastic filaments 25 are arranged at intervals in a direction perpendicular to the X direction (that is, a direction perpendicular to the plane of the drawing).

Both of the nonwoven fabrics 26, 26 forming the second nonwoven fabric layer 24 are preferably extensible. Nonwoven fabrics 26, 26 typically comprise substantially inelastic fibers and are substantially inelastic.
The "elastic" of elastic filaments 25 and the inelastic "elastic" of non-woven fabric 26 are defined as being stretchable and stretched 50% of their original length (150% of their original length, i.e. 1.5 It is the property of returning to 110% or less of the original length when the force is released from the double length state.
The nonwoven fabrics 26, 26 are preferably stretchable in the same direction as the X direction in which the elastic filaments 25 extend.
In this specification, the term "stretchable" refers to (a) the case where the constituent fibers of the nonwoven fabrics 26, 26 themselves are stretched, and (b) the fibers that are bonded at the intersections even if the constituent fibers themselves are not stretched. When the nonwoven fabric as a whole stretches due to separation of fibers, structural changes in the three-dimensional structure formed by multiple fibers due to bonding between fibers, breakage of constituent fibers, or stretching of slack in fibers. and
Each of the nonwoven fabrics 26 , 26 may already be extensible in the raw state before being joined with the elastic filaments 25 . Alternatively, the original fabric is not stretchable before being joined to the elastic filaments 25, but is processed so as to be stretchable after being joined to the elastic filaments 25, so that it becomes stretchable. good too. Specific methods for making the nonwoven fabric 26 extensible include heat treatment, stretching between rolls, bite stretching by tooth grooves or gears, tensile stretching by a tenter, and the like. In view of the preferred manufacturing method of the sheet 10, which will be described later, the nonwoven fabric 26 can be easily conveyed when the elastic filaments 25 are welded to the nonwoven fabric 26. It is preferably non-extensible.

Preferably, each of the plurality of elastic filaments 25 forming the second nonwoven fabric layer 24 is substantially continuous over the entire length of the second nonwoven fabric layer 24 . Each elastic filament 25 typically contains an elastic resin.

The elastic filament 25 may be thread-like synthetic rubber or natural rubber. Alternatively, it may be obtained by dry spinning (melt spinning) or wet spinning. The elastic filaments 25 are preferably obtained by direct melt spinning without winding them once. Moreover, it is preferable that the elastic filaments 25 are obtained by drawing an undrawn yarn.
Moreover, the elastic filament 25 is preferably formed by drawing an elastic resin in a melted or softened state. This facilitates joining the elastic filaments 25 to the nonwoven fabric 26 in a non-stretched state.
As a specific drawing operation, (a) the resin that is the raw material of the elastic filament 25 is melt-spun to obtain an undrawn yarn, and the elastic filament of the undrawn yarn is heated again to reach the softening temperature (hard segment Examples include an operation of drawing at a glass transition temperature (Tg) or higher, and (b) an operation of directly drawing a molten fiber obtained by melt-spinning a resin that is a raw material of the elastic filament 25 . In a preferred method of manufacturing the sheet 10, which will be described later, the elastic filaments 25 are obtained by directly drawing fibers in a molten state obtained by melt spinning.

Each elastic filament 25 is preferably bonded over its entire length to a nonwoven fabric 26,26.
"Bonded over the entire length" does not require that all fibers (constituent fibers of the nonwoven fabric 26) in contact with the elastic filaments 25 are bonded to the elastic filaments 25, and the elastic filaments 25 Second, it means that the elastic filaments 25 and the constituent fibers of the nonwoven fabric 26 are joined in such a manner that there are no intentionally formed unjoined portions.
Methods of joining the elastic filaments 25 and the nonwoven fabrics 26, 26 include, for example, welding and bonding with an adhesive. It is also preferable to weld the elastic filaments 25 to the nonwoven fabric 26 before solidifying the elastic filaments 25 obtained by melt spinning. In this case, before bonding the nonwoven fabric 26 and the elastic filaments 25, an adhesive can be applied as an auxiliary bonding means. Alternatively, after bonding each nonwoven fabric 26 and the elastic filaments 25, heat treatment (steam jet, heat embossing) or mechanical entangling (needle punch, spunlace) can be performed as auxiliary bonding means.
The bonding between the nonwoven fabric 26 and the elastic filaments 25 is achieved only by solidifying the molten or softened elastic filaments 25 in contact with the nonwoven fabric 26, that is, bonding without using an adhesive. From the point of view of improving the flexibility of the second nonwoven fabric layer 24, it is preferable that

The stretchability of the second nonwoven fabric layer 24 is developed due to the elasticity of the elastic filaments 25 . When the second nonwoven fabric layer 24 is stretched in the same direction as the direction in which the elastic filaments 25 extend, the elastic filaments 25 and the nonwoven fabrics 26, 26 are stretched. When the stretching of the second nonwoven fabric layer 24 is released, the elastic filaments 25 contract, and the nonwoven fabric 26 returns to the state before stretching along with the contraction.

As the second non-woven fabric layer 24, non-stretchable non-woven fabrics 26, 26 are bonded to non-stretched elastic filaments 25 to produce a non-stretchable composite material. It is preferable to use a material that exhibits stretchability by being passed between a pair of mutually meshing uneven surfaces having portions and grooves alternately, specifically, between a pair of rolls having tooth grooves. The details of this manufacturing method will be described later.

In the sheet of the present invention, part or all of the nanofiber layer is preferably positioned on one side of the half in the thickness direction. This makes the sheet of the invention more leakproof. In particular, when the sheet of the present invention is incorporated into an absorbent article as a constituent member of the absorbent article, part or all of the nanofiber layer is located at a position closer to the absorber than the half of the sheet in the thickness direction. It is preferable that the entire nanofiber layer is located, from the viewpoint of further improving the leakproofness. 4(b), 4(c), 5, 7(a), 7(b), 8, 9(a), 9(b) and 10, for example In the embodiment shown, it is preferable to arrange the sheet 10 so that the first surface 21 faces the absorbent body, and in the embodiment shown in FIGS. It is preferable to place the sheet 10 so that the second surface 22 faces the absorbent body.
The above-mentioned "half in the thickness direction" means half the thickness measured with a pressure of 49 Pa applied to the sheet of the present invention.

Even when the sheet of the present invention is any of the embodiments shown in FIGS. 4 to 10 described above, when the sheet of the present invention is used as a constituent member of an absorbent article, the surface of the sheet having an uneven structure is preferably arranged so as to face the absorber. For example, the sheet of the present invention can be placed on the non-skin-facing surface of an absorbent body so that the surface of the sheet having an uneven structure faces the absorbent body, and the sheet can be used as a backsheet. Moreover, the sheet of the present invention can be used as a leak-proof cuff so that the surface of the sheet having the concave-convex structure becomes the inner surface (that is, the surface facing the absorber). By arranging the sheet of the present invention in this way, it is possible to further improve the leakproofness of the sheet.

When the surface having an uneven structure in the sheet of the present invention is arranged so as to face the absorbent body, the sheet has a non-woven fabric layer flatter than the skin-facing surface on the non-skin-facing surface side of the nanofiber layer. is preferred. This makes it easier to maintain the uneven structure. Therefore, even when the wearer moves while wearing the absorbent article provided with the sheet of the present invention, it is possible to stably reduce the contact area between the sheet of the present invention and the absorbent body. be done. The nonwoven fabric layer flatter than the skin-facing surface is preferably a layer other than the nanofiber layer, but may be a nanofiber layer or a layer containing a nanofiber layer. 4(b), 4(c), 5, 7(a), 7(b), 8, 9(a), 9(b) and 10, for example In the illustrated embodiment, it is preferred to position the sheet 10 so that the first side 21 faces the absorbent body.

When the surface of the sheet of the present invention having an uneven structure is arranged so as to face the absorbent body, the sheet preferably has an air-through layer on the non-skin-facing surface side of the nanofiber layer. As a result, the cushioning feeling of the air-through layer becomes remarkable, and the absorbent article becomes pleasant to the touch.
For example, in the embodiments shown in FIGS. 5, 7 (a), 7 (b), 8, 9 (a), 9 (b) and 10, the first surface 21 is used as a skin facing surface, It is preferable to use the second surface 22 as a non-skin facing surface.

When the surface of the sheet of the present invention having an uneven structure is arranged so as to face the absorber, the sheet preferably has an air-through layer on the side facing the skin rather than the nanofiber layer. As a result, the cushioning feeling of the air-through layer becomes remarkable, and the absorbent article becomes pleasant to the touch.
For example, in the embodiment shown in FIG. 5, it is preferable to use the first surface 21 as the skin facing surface and the second surface 22 as the non-skin facing surface.

The sheet of the present invention may or may not have stretchability even when the sheet of the present invention is any of the embodiments of FIGS. 4 to 10 described above. good too. When the sheet of the present invention has stretchability, there is an advantage that, when the absorbent article having the sheet of the present invention is worn, the followability is improved when the wearer moves. As used herein, the term "stretchability" refers to the property of being able to stretch in a given direction and contracting when the stretch is released.

Next, a preferred method for manufacturing the sheet of the present invention will be described. FIG. 11 schematically shows an example of suitable equipment used to manufacture the sheet of the present invention. The apparatus 40 shown in the figure is preferably used for manufacturing the sheet 10 shown in FIGS. 7(a), 7(b) and 8, for example.

The device 30 shown in FIG. 11 comprises a card machine 31 . A card web 32 is manufactured in the card machine 31 . The card web 32 preferably contains heat-shrinkable fibers that can be shrunk by applying heat. It is preferable to use latently crimped fibers as the heat-shrinkable fibers from the viewpoint of obtaining a sheet having distinct protrusions.

The card web 32 drawn out from the card machine 31 is overlapped with the SNS web 33 during the transport process. The SNS web 33 is a laminated web having a three-layer structure in which a spunbond layer is arranged on each surface of a meltblown layer. In the SNS web 33, the three layers may be joined and integrated by various joining means such as heat embossing or adhesive. Alternatively, the three layers may be laminated without bonding. Instead of the SNS web 33, a meltblown web may be used, or a laminated web having a two-layer structure in which a spunbond layer is arranged on one surface of a meltblown layer may be used.

The card web 32 and the SNS web 33 are introduced into a thermal embossing roll device 34 having an embossing roll 34a and an anvil roll 34b and are thermally embossed. Both webs 32 and 33 are partially joined and integrated by thermal embossing. As a result, the desired sheet precursor 35 is obtained.

The obtained sheet precursor 35 is introduced into a heat treatment device 36 arranged on the conveying path and subjected to heat treatment. The heat treatment is performed at a temperature equal to or higher than the heat shrinkage starting temperature of the heat shrinkable fibers contained in the card web 32 .
The heat treatment heat-shrinks the heat-shrinkable fibers in the card web 32 and shortens the dimension of the card web 32 in the surface direction. On the other hand, since the SNS web 33 does not contain heat-shrinkable fibers, the SNS web 33 does not undergo heat shrinkage. Even if the dimension of the card web 32 in the plane direction is shortened, the dimension of the SNS web 33 in the plane direction does not change. As a result, the SNS web 33 rises. The bulging of the SNS web 33 occurs between the joints of the card web 32 and the SNS web 33 . As a result, the SNS web 33 has many protrusions. The junction becomes a recess located between the protrusions. Thus, the intended sheet 10 is obtained.
The heat treatment in the heat treatment device 36 may be performed by blowing hot air through an air-through method, or by microwave irradiation, steam blowing, infrared irradiation, contact with a heat roll, or the like.
During the heat treatment, it is preferable to fix the sheet precursor 35 with a pin tenter from the viewpoint of forming distinct projections 11 .

When the degree of shrinkage of the card web 32 is increased by appropriately controlling the heat treatment conditions in the heat treatment device 36, the sheet 10 in which the insides of the protrusions 11 are filled with fibers is obtained as shown in FIG. 7(a). . On the other hand, when the degree of shrinkage of the card web 42 is small, as shown in FIG.

FIG. 12 schematically shows an example of suitable equipment used to manufacture the sheet of the present invention. The apparatus 40 shown in the figure is suitably used for manufacturing the sheet 10 shown in FIGS. 4(a), 4(b), 4(c), 6(b) and 7(b), for example.

In manufacturing the sheet 10 using the device 40 shown in FIG. A step of joining the second fiber sheet 42 is performed. Before the bonding step, a step of shaping the first fiber sheet 41 to form unevenness is performed.
The first fiber sheet 41 is a raw fabric of a nonwoven fabric layer positioned on the first surface 21 side of the sheet 10. For example, in the sheet 10 shown in FIG. is.
The second fiber sheet 42 is the raw fabric of the nonwoven fabric layer positioned on the second surface 22 side of the sheet 10, and is the raw fabric of the SNS layer 15 in the sheet 10 shown in FIG. 4A, for example.

Manufacture of the sheet 10 using the apparatus 40 shown in FIG. 12 will be described in detail. First, the uneven shaping of the first fiber sheet 41 will be described. Concavo-convex shaping of the first fiber sheet 41 is performed by a first roll 43 having a concavo-convex peripheral surface and a second roll having a concavo-convex peripheral surface that meshes with the uneven shape of the first roll 43. 44, preferably by a shaping device 45.
Both the first roll 43 and the second roll 44 have a structure in which the protruded streaks 46A and the recessed streaks 46B extending along the rotation axis of the rolls are alternately provided along the rotation direction of the rolls. preferable.
The first roll 43 and the second roll 44 are configured to rotate in directions opposite to each other while the circumferential surfaces of both rolls are meshed with each other.

While both rolls 43 and 44 are in mesh with each other, the first fiber sheet 41 is supplied to the meshing portion of both rolls 43 and 44 to shape the first fiber sheet 41 into unevenness. At the meshing portion of both rolls 43 and 44, a plurality of portions of the first fiber sheet 41 are pushed into the concave portion of the first roll 43 by the convex portion of the second roll 44, and the pushed portion serves as the target. It becomes the convex part 11 of the sheet|seat 10 which makes it.

When forming unevenness, air is sucked from the outside of the peripheral surface of the first roll 43 toward the inside of the roll 43 on the peripheral surface of the first roll 43, and the first fiber sheet 41 is brought into close contact with the peripheral surface. This is preferable from the point of reliably shaping the fiber sheet 41 into irregularities. For this purpose, a suction hole (not shown) is provided in the recessed portion provided in the first roll 43, and air is sucked from the outside to the inside of the roll 43 through the suction hole. preferable.

It is preferable that the first fiber sheet 41, which has been formed into irregularities, is conveyed while being held on the peripheral surface of the first roll 43, and moved from the meshing portion.
On the other hand, the second fibrous sheet 42 is unwound from the original fabric and overlapped with the first fibrous sheet 41 which has been unevenly shaped. Simultaneously with or after the superposition of the two sheets 41 , 42 , the two sheets 41 , 42 are introduced into the joining device 47 . The bonding device 47 can be, for example, a heat roll as shown. Alternatively, the bonding device 47 can be an ultrasonic sealing device (not shown) with an ultrasonic horn.
In the joining device 47, the first fiber sheet 41 and the second fiber sheet 42 are partially joined to form the joint portion 16 described above.

In manufacturing the sheet 10 using the apparatus 40 shown in FIG. 12, it is preferable to set the supply speed V1 of the first fibrous sheet 41 faster than the supply speed V2 of the second fibrous sheet 42 . As a result, the first fiber sheet 41 is less likely to be damaged when the first fiber sheet 41 is shaped to be uneven. This is particularly effective when the first fibrous sheet 41 includes a meltblown layer. The reason for this is that the meltblown layer has relatively low strength and is susceptible to damage due to uneven shaping. The supply speed V1 of the first fiber sheet 41 may be faster than the supply speed V2 of the second fiber sheet 42 to the extent that unevenness can be formed. Just do it.

Figures 13(a)-(d) show another example of a suitable apparatus used to manufacture the sheet of the present invention. The apparatus 50 shown in the figure is preferably used for manufacturing the sheet 10 shown in FIGS. 4(a), 4(b) and 4(c), for example.

In the device 50 shown in FIG. 13( a ), a plurality of partition walls 52 are arranged parallel to each other at regular intervals on the main surface of a flat substrate 51 . This device 50 is used as a sheet concavo-convex forming member.

As shown in FIG. 13(b), the first fiber sheet 53 is placed on the partition wall 52 of the device 50 shown in FIG. 13(a). The first fiber sheet 53 can be, for example, a spunbond layer or an SNS layer.

Next, as shown in FIG. 13(c), the pressing member 54 is used to press the first fiber sheet 53 into the space between the partition walls 52 to shape the first fiber sheet 53 into an uneven shape. The type of the pushing member 54 is not particularly limited as long as the material is capable of pushing the first fiber sheet 53 into the space between the partition walls 52 . The pushing member 54 can thus be, for example, a filament. Of course, the pushing member 54 may be a rigid body such as a rod.

After the first fibrous sheet 53 has been shaped to have unevenness, a second fibrous sheet 55 is placed on the first fibrous sheet 53 as shown in FIG. 13(d). As described above, since the first fiber sheet 53 is unevenly shaped, the tops of the protrusions of the first fiber sheet 53 come into contact with the second fiber sheet 55 . The second fiber sheet 55 can be, for example, a spunbond layer or an SNS layer.
With the second fiber sheet 55 placed on the first fiber sheet 53, heat is applied to both the sheets 53 and 55 to separate the two sheets 53 and 55 at the portions where the two sheets 53 and 55 are in contact. Join. Heat can be applied by, for example, pressing a heating element against the second fiber sheet 55, blowing hot air, or irradiating with infrared rays.

Figures 14(a)-(e) show another example of a suitable apparatus used to manufacture the sheet of the present invention. The apparatus 60 shown in the figure is suitably used, for example, for manufacturing the sheet 10 shown in FIGS. 4(a), 4(b), 4(c) and 6(b).

In the device 60 shown in FIG. 14(a), a plurality of columnar members 62 are arranged on the principal surface of a flat substrate 61 at regular intervals in the longitudinal and lateral directions of the principal surface. This device 60 is used as a sheet concavo-convex shaping member. The columnar member 62 may be a cylinder or a prism.
As shown in FIG. 14(b), the device 60 has shaping restricting members 63 arranged between adjacent columnar members 62. As shown in FIG. The shaping restricting member 63 is arranged for the purpose of adjusting the degree of uneven shaping applied to the first fiber sheet 64 in the step shown in FIG. 14(d), which will be described later.
Under the condition shown in FIG. 14(b), the first fiber sheet 64 is placed on the columnar member 62 of the device 60 as shown in FIG. 14(c). The first fiber sheet 64 can be, for example, a spunbond layer or an SNS layer. Alternatively, the first fibrous sheet 64 can be a carded web.

Next, as shown in FIG. 14(d), a pressing member 65 is used to press the first fiber sheet 64 into the space between the columnar members 62 to form the first unevenness. The pushing member 65 can be a rigid body such as a rod. The pressing of the first fiber sheet 64 by the pressing member 65 is adjusted to a certain degree by the shaping restricting member 63 .

After the first fibrous sheet 64 is formed into the primary concave-convex shape, the pressing member 65 is retracted and the shaping restricting member 63 is removed. Next, as shown in FIG. 14(e), hot air is blown onto the first fiber sheet 64 to form secondary unevenness. The blowing of hot air may be performed only once, or may be performed twice or more. When the hot air is blown twice or more, it is clear that the temperature of the hot air is set to be the same for the first time and the second time and thereafter, and the speed of the hot air after the second time is set slower than that of the first time. It is preferable from the point that uneven shaping is possible.

After the first fibrous sheet 64 is thus shaped to be uneven, a second fibrous sheet (not shown) is arranged on the first fibrous sheet 64 in the same manner as the procedure shown in FIG. 13(d). . The second fibrous sheet can be, for example, a spunbond layer or an SNS layer. Thereafter, the desired sheet is obtained by bonding the first fiber sheet and the second fiber sheet in the same manner as in the procedure shown in FIG. 13(d) described above. A hot-melt adhesive can also be used for joining the first fiber sheet and the second fiber sheet.

Figures 15 and 16 show another example of a suitable apparatus for use in making the sheet of the present invention. The apparatus 70 shown in FIG. 16 is preferably used for manufacturing the sheet 10 shown in FIG. 10, for example.
As shown in FIG. 16, the method for manufacturing the sheet 10 using the manufacturing apparatus 70 includes a first fiber sheet 23A that is the original fabric of the first nonwoven fabric layer 23 and a second fiber sheet 23A that is the original fabric of the second nonwoven fabric layer 24. a joining step of partially joining the sheet 24A to obtain the sheet 10; Specifically, this manufacturing method includes a step of superimposing the second fiber sheet 24A on one side of the first fiber sheet 23A in a stretched state of the second fiber sheet 24A having stretchability; and partially joining the sheets 23A and 24A.

15, the manufacturing method of the sheet 10 using the manufacturing apparatus 70 is a precursor manufacturing method for manufacturing a composite material 24B, which is a precursor of the second fiber sheet 24A, as the raw fabric of the second nonwoven fabric layer 24, as shown in FIG. and, as shown in FIG. 16, a stretchability expression treatment step of stretching the composite material 24B to obtain a stretchable second fiber sheet 24A, which is the original fabric of the second nonwoven fabric layer 24. is preferred.

In the precursor manufacturing process, as shown in FIG. 15, a plurality of elastic filaments 25 are joined to nonwoven fabrics 26, 26 so as to extend in one direction and in a substantially unstretched state to form a second fiber sheet. It is preferred to have composite 24B that is a precursor of 24A. More specifically, a large number of molten elastic filaments 25 spun from the spinning nozzle 86 are drawn at a predetermined speed and stretched so that the elastic filaments 25 do not cross each other before solidification. Preferably, the elastic filaments 25 are welded to two nonwoven fabrics 26, 26 so as to be aligned in one direction. This produces a composite material 24B as a precursor of the second fibrous sheet 24A, in which the plurality of elastic filaments 25 are bonded over their entire lengths to the nonwoven fabrics 26, 26 in a substantially unstretched state.

In the stretchability development treatment step in the present embodiment, the tooth gap stretching device 75 is used to stretch the composite material 24B as a precursor of the second fiber sheet 24A.
This stretching process is a process of stretching the composite material 24B along the direction in which the elastic filaments 25 extend to impart extensibility to the two nonwoven fabrics 26,26. The imparting of extensibility here includes the case of greatly improving the extensibility of the nonwoven fabric 26 having some extensibility.

The tooth space extending device 75 has teeth, which are axially extending ridges, and axially extending grooves formed between the teeth alternately in the circumferential direction. Preferably, grooved rolls 76,77 are provided.
In the stretchability development treatment step using the tooth groove stretching device 75, the composite material 24B obtained in the precursor manufacturing step is supplied between a pair of tooth groove rolls 76 and 77, and the composite material 24B is stretched. , to obtain a second fiber sheet 24A in which the nonwoven fabrics 26, 26 contained in the composite material 24B are stretchable. For the purpose of effective stretching, a first nip roll 88 is arranged upstream of the tooth space stretching device 75 and a second nip roll 89 is arranged downstream of the tooth space stretching device 75 to stretch the composite material 24B. It is preferable to perform the stretchability development treatment step in a state in which tension is applied.
As the tooth profile of the tooth groove rolls 76 and 77, a general involute tooth profile and a cycloid tooth profile are used.

In this way, the second fiber sheet 24A is obtained by partially stretching the composite material 24B by the pair of tooth groove rolls 76, 77 and the like. The obtained second fiber sheet 24A exhibits stretchability along the direction in which the elastic filaments 25 extend.
15 and 16 show a case where the composite material 24B is wound into a roll to form a roll 24R, and then the composite material 24B unwound from the roll 24R is stretched. The resulting composite material 24B may be introduced into a tooth space stretching device using tooth space rolls 76 and 77 without being wound into a roll.
As for the first fiber sheet 23A, as shown in FIG. 16, the first fiber sheet 23A can be used by unwinding from a roll 23R of the first fiber sheet 23A.
The method of stretching the composite material 24B by the tooth groove rolls 76 and 77 to impart stretchability to the composite material 24B has been described above. The second fiber sheet 24A may be produced by using a nonwoven fabric having elasticity and laminating the nonwoven fabric in a stretched state.

In the bonding step in the present embodiment, the first fiber sheet 23A and the second fiber sheet 24A are partially joined to the laminated sheet 10A in which the stretched second fiber sheet 24A and the first fiber sheet 23A are superimposed. It is preferable that a joining process is performed to join to.
Any device capable of partially joining the first fiber sheet 23A and the second fiber sheet 24A can be used for the joining process. For example, a heat sealing device, an ultrasonic sealing device, a high frequency sealing device, or the like can be used.
FIG. 16 shows a state in which the first fiber sheet 23A and the second fiber sheet 24A are partially joined using an ultrasonic sealing device 71A. The ultrasonic sealing device 71A has an ultrasonic horn 72 and an anvil roll 71 arranged at a position facing the horn 72 . The laminated sheet 10A is conveyed along the peripheral surface of the anvil roll 71. As shown in FIG. The laminated sheet 10A is irradiated with ultrasonic waves by an ultrasonic horn 72 during the transport process, thereby partially joining the second fiber sheet 24A and the first fiber sheet 23A.

In the production of the sheet of the present invention using the apparatuses 30, 40, 50, 60 and 70 shown in FIGS. 11 to 16, a water repellent agent can be applied to the sheet 10 after production. Alternatively, a water repellent agent can be applied to the raw fabric before manufacturing. By adding a water-repellent agent, the sheet of the present invention is more leak-proof. A water repellent agent may be internally added to the resin used for spinning the spunbond nonwoven fabric, the meltblown nonwoven fabric, or the electrospun nonwoven fabric. Water repellency is imparted to the fiber surface by bleeding out of the water repellent added to the resin.
Examples of water repellents include nonionic water repellents, anionic water repellants, cationic water repellants, amphoteric water repellants, silicone water repellants, fluorine compound water repellants, oils and fats. Although not limited to these water repellents as long as the effects of the present invention are exhibited, it is preferable to use fluorine compound water repellents and oils and fats from the viewpoint of water repellency. As fats and oils, triglycerides are preferable, and triglyceride palmitate, triglyceride stearate, extremely hardened palm oil, and high erucine rapeseed hardened oil are more preferable.

Although the present invention has been described above based on its preferred embodiments, the present invention is not limited to the above embodiments.
For example, in the embodiment shown in FIGS. 4 to 10, the first surface 21 of the sheet 10 has an uneven structure and the second surface 22 is a flat surface. Both of the two surfaces 22 may have an uneven structure.

Regarding the above-described embodiment, the present invention further discloses the following sheet for absorbent articles.
<1>
An absorbent article sheet in which a plurality of nonwoven fabric layers are laminated,
At least one surface of the sheet has an uneven structure,
A sheet for absorbent articles having water repellency against a liquid having a surface tension of 60 mN/m.

<2>
The absorbent article sheet according to <1> above, which has water repellency against a liquid having a surface tension of preferably 50 mN/m, more preferably against a liquid having a surface tension of 40 mN/m.
<3>
In one surface of the sheet, convex portions and concave portions are alternately arranged along one direction, and convex portions and concave portions are alternately arranged along a direction orthogonal to the one direction. , the absorbent article sheet according to <1> or <2>.
<4>
A convex portion extending continuously in a streaky shape along one direction in one surface of the sheet and a recessed portion extending continuously in a streaky shape along the one direction are provided along a direction orthogonal to the one direction. The sheet for absorbent articles according to <1> or <2>, wherein the sheets are arranged alternately.
<5>
The absorbent article sheet according to any one of <1> to <4>, wherein the width of the protrusions in the uneven structure is 0.5 mm or more and 8 mm or less.
<6>
The width of the protrusions in the uneven structure is preferably 1 mm or more, more preferably 1.5 mm or more,
The sheet for absorbent articles according to <5> above, wherein the width of the protrusions in the uneven structure is preferably 6 mm or less, more preferably 4 mm or less.

<7>
The pitch of the protrusions in the uneven structure is preferably 1 mm or more, more preferably 1.5 mm or more, and even more preferably 2 mm or more,
The pitch of the protrusions in the uneven structure is preferably 10 mm or less, more preferably 9 mm or less, and even more preferably 8 mm or less, according to any one of <1> to <6>. sheet for absorbent articles.
<8>
The height of the protrusions in the uneven structure is preferably 0.5 mm or more, more preferably 0.7 mm or more, and even more preferably 0.9 mm or more,
The height of the protrusions in the uneven structure is preferably 5 mm or less, more preferably 4 mm or less, and still more preferably 3 mm or less, according to any one of <1> to <7> The sheet for absorbent articles described.
<9>
The sheet for absorbent articles according to any one of <1> to <8>, wherein the inside of the protrusions in the uneven structure is solid.
<10>
The sheet for absorbent articles according to any one of <1> to <8>, wherein the inside of the protrusions in the uneven structure is hollow.
<11>
The absorbent article sheet according to any one of <1> to <10>, including a nanofiber layer.

<12>
The absorbent article sheet according to <11>, wherein the nanofiber layer has an uneven structure.
<13>
The absorbent article sheet according to <11> or <12>, wherein part or all of the nanofiber layer is located on one side of the half in the thickness direction.
<14>
The absorbent article sheet according to <13>, wherein the entire nanofiber layer is located on one side of the half in the thickness direction.
<15>
The absorbent article sheet according to any one of <11> to <14>, including the nanofiber layer having fibers having a fiber diameter of 1 μm or less as constituent fibers.
<16>
The fiber diameter of the constituent fibers of the nanofiber layer is preferably 1 μm or less, more preferably 0.9 μm or less,
The absorbent article sheet according to any one of <11> to <15>, wherein the fiber diameter of the constituent fibers of the nanofiber layer is preferably 0.4 μm or more.

<17>
The thickness of the nanofiber layer is preferably 3 μm or more and 150 μm or less, more preferably 10 μm or more and 120 μm or less, and still more preferably 15 μm or more and 100 μm or less. 1. The sheet for absorbent articles according to 1 above.
<18>
Having another nonwoven fabric layer in addition to the nanofiber layer,
The absorbent article sheet according to any one of <11> to <17>, wherein the other nonwoven fabric layer has stretchability.
<19>
the nanofiber layer comprises a meltblown layer,
The absorbent article sheet according to any one of <11> to <18>, wherein the meltblown layer is disposed between a pair of spunbond layers.
<20>
The absorbent article sheet according to <19>, wherein an SNS layer in which the meltblown layer is arranged between the pair of spunbond layers constitutes the uneven structure.
<21>
The absorbent article sheet according to any one of <1> to <20>, which has an air-through layer.

<22>
having an SNS layer in which the nanofiber layer is disposed between a pair of spunbond layers;
The absorbent article sheet according to <21>, wherein an air-through layer is arranged on the outer surface of at least one of the pair of spunbond layers in the SNS layer.
<23>
The absorbent article sheet according to <21> or <22>, wherein the air-through layer constitutes the uneven structure.
<24>
The absorbent article sheet according to <21> or <22>, wherein the air-through layer is present at a site other than the uneven structure.
<25>
The air-through layer is arranged on each surface of the nanofiber layer,
Both the nanofiber layer and the air-through layer protrude toward one surface side of the sheet to form a convex portion,
The absorbent article sheet according to any one of <21> to <24>, wherein the inside of the convex portion is solid.
<26>
The absorbent article sheet according to any one of <21> to <25>, wherein the air-through layer contains crimped fibers.

<27>
having a first surface and a second surface located on the opposite side;
The first surface side has an uneven structure,
The second surface is a flat surface,
A single spunbond layer is located on the first surface side,
The spunbond layer constitutes a convex portion and a concave portion,
The inside of the convex portion is hollow,
An SNS layer composed of a spunbond layer, a nanofiber layer and a spunbond layer is located on the second surface side,
The absorbent article sheet according to any one of <1> to <26>, wherein each surface of the SNS layer is a flat surface.
<28>
having a first surface and a second surface located on the opposite side;
An SNS layer composed of a spunbond layer, a nanofiber layer and a spunbond layer is located on the first surface side,
The SNS layer constitutes a convex portion 11 and a concave portion 12,
The inside of the convex portion is hollow,
A single spunbond layer is located on the second side, and
The absorbent article sheet according to any one of <1> to <26>, wherein each surface of the spunbond layer is a flat surface.
<29>
having a first surface and a second surface located on the opposite side;
A first SNS layer consisting of a spunbond layer, a nanofiber layer and a spunbond layer is located on the first surface side,
The first SNS layer comprises a convex portion and a concave portion,
The inside of the convex portion is hollow,
A second SNS layer consisting of a spunbond layer, a nanofiber layer and a spunbond layer is located on the second surface side,
The absorbent article sheet according to any one of <1> to <26>, wherein each surface of the second SNS layer is a flat surface.
<30>
having a first surface and a second surface located on the opposite side;
The first surface side has an uneven structure,
The second surface is a flat surface,
It has a structure in which an air-through layer is arranged on each surface of the nanofiber layer,
Both the nanofiber layer and the pair of air-through layers protrude toward the first surface side to form convex portions,
The inside of the convex portion is solid,
The interior of the convex portion is mainly filled with constituent fibers of the air-through layer located on the second surface side,
Of the pair of air-through layers, the air-through layer located on the second surface side has a flat outer surface,
The absorbent article sheet according to any one of <1> to <26>, wherein the nanofiber layer and the pair of air-through layers are compacted and integrally joined in the recesses of the sheet.
<31>
having a first surface and a second surface located on the opposite side;
The first surface side has an uneven structure,
The second surface is a flat surface,
An air-through layer is located on the first surface side,
The air-through layer constitutes a convex portion and a concave portion,
The inside of the convex portion is solid,
An SNS layer in which a nanofiber layer is arranged between a pair of spunbond layers is located on the second surface side,
Each surface of the SNS layer is a flat surface,
The absorbent article according to any one of <1> to <26>, wherein the air-through layer is compacted and integrally joined to the SNS layer located on the second surface side in the concave portion. sheet for.

<32>
having a first surface and a second surface located on the opposite side;
The first surface side has an uneven structure,
The second surface is a flat surface,
An air-through layer is located on the first surface side,
The air-through layer constitutes a convex portion and a concave portion,
The inside of the convex portion is hollow,
An SNS layer in which a nanofiber layer is arranged between a pair of spunbond layers is located on the second surface side,
Each surface of the SNS layer is a flat surface,
The absorbent article according to any one of <1> to <26>, wherein the air-through layer is compacted and integrally joined to the SNS layer located on the second surface side in the concave portion. sheet for.
<33>
having a first surface and a second surface located on the opposite side;
The first surface side has an uneven structure,
The second surface is a flat surface,
An SNS layer having a nanofiber layer disposed between a pair of spunbond layers is located on the first surface side,
The SNS layer comprises a convex portion and a concave portion,
An air-through layer is located on the second surface side,
The air-through layer has a flat outer surface,
The surface of the air-through layer facing the SNS layer has an uneven structure,
The concave-convex structure has a shape complementary to the concave-convex structure formed by the SNS layer,
The inside of the convex portion is solid,
The inside of the convex portion is filled with the constituent fibers of the air-through layer,
The absorbent article according to any one of <1> to <26>, wherein the SNS layer is densified and integrally joined with the air-through layer located on the second surface side in the concave portion. sheet for.
<34>
having a first surface and a second surface located on the opposite side;
The first surface side has an uneven structure,
The second surface is a flat surface,
An SNS layer having a nanofiber layer disposed between a pair of spunbond layers is located on the first surface side,
The SNS layer comprises a convex portion and a concave portion,
An air-through layer is located on the second surface side,
The air-through layer has a flat outer surface,
The surface of the air-through layer facing the SNS layer has an uneven structure,
Constituent fibers of the air-through layer are present inside the convex portion,
The constituent fibers of the air-through layer do not completely fill the inside of the convex portion, there is a space inside the convex portion, and the inside of the convex portion is hollow,
The absorbent article according to any one of <1> to <26>, wherein the SNS layer is densified and integrally joined with the air-through layer located on the second surface side in the concave portion. sheet for.
<35>
having a first surface and a second surface located on the opposite side;
The first surface side has an uneven structure,
The second surface is a flat surface,
It has an SNS layer in which a nanofiber layer is arranged between a pair of spunbond layers, and an air-through layer arranged on each surface of the SNS layer 15,
Both the SNS layer and the pair of air-through layers protrude toward the first surface side to form a convex portion,
The inside of the convex portion is solid,
The interior of the convex portion is mainly filled with constituent fibers of the air-through layer located on the second surface side,
The air-through layer located on the second surface side has a flat outer surface,
The absorbent article sheet according to any one of <1> to <26>, wherein the SNS layer and the pair of air-through layers are densified and integrally joined in the recesses of the sheet.
<36>
having a first surface and a second surface located on the opposite side;
The first surface side has an uneven structure,
The second surface is a flat surface,
A first SNS layer having a nanofiber layer disposed between a pair of spunbond layers is located on the first surface side,
The first SNS layer comprises a convex portion and a concave portion,
a second SNS layer having a nanofiber layer disposed between a pair of spunbond layers on the second surface side;
Each surface of the second SNS layer is a flat surface,
An air-through layer is arranged between the first SNS layer and the second SNS layer,
The air-through layer is positioned within the convex portion so as to fill the entire space of the convex portion defined by the first SNS layer and the second SNS layer,
The inside of the convex portion is solid,
The absorbent article sheet according to any one of <1> to <26>, wherein the inside of the convex portion is filled with constituent fibers of the air-through layer.

<37>
having a first surface and a second surface located on the opposite side;
The first surface side has an uneven structure,
The second surface is a flat surface,
A first SNS layer having a nanofiber layer disposed between a pair of spunbond layers is located on the first surface side,
The first SNS layer comprises a convex portion and a concave portion,
a second SNS layer having a nanofiber layer disposed between a pair of spunbond layers on the second surface side;
Each surface of the second SNS layer is a flat surface,
An air-through layer is arranged between the first SNS layer and the second SNS layer,
In the air-through layer, constituent fibers of the air-through layer are present inside convex portions defined by the first SNS layer and the second SNS layer,
The constituent fibers of the air-through layer do not completely fill the inside of the convex portion, there is a space inside the convex portion, and the inside of the convex portion is hollow. 26>, the absorbent article sheet according to any one of above.
<38>
having a first surface and a second surface located on the opposite side;
The first surface side has an uneven structure,
The second surface is a flat surface,
A first nonwoven fabric layer having an uneven structure is located on the first surface side,
A second nonwoven fabric layer 24 is located on the second surface side,
The first nonwoven fabric layer constitutes a convex portion and a concave portion,
The inside of the convex portion is hollow,
wherein the first nonwoven layer consists of a nanofiber layer or a nonwoven layer containing a nanofiber layer;
Each surface of the second nonwoven fabric layer is a flat surface,
the second nonwoven layer is a nonwoven comprising elastic filaments and inelastic fibers;
The absorbent according to any one of <1> to <26>, wherein the second nonwoven fabric layer has the elastic filaments bonded to the nonwoven fabric containing the inelastic fibers in a substantially unstretched state. Goods sheet.
<39>
An absorbent article comprising an absorbent body and the absorbent article sheet according to any one of <1> to <38>,
An absorbent article, wherein the sheet for absorbent article is arranged such that the surface having the uneven structure of the sheet for absorbent article faces the absorber.
<40>
The absorbent article sheet has a nanofiber layer,
The absorbent article according to <39> above, which has a nonwoven fabric layer flatter than the skin-facing surface on the non-skin-facing surface side of the nanofiber layer.
<41>
The absorbent article according to <40>, which has an air-through layer on the skin-facing side of the nanofiber layer.
<42>
The absorbent article according to any one of <39> to <41>, wherein the absorbent article sheet is arranged on the non-skin facing side of the absorbent body.

EXAMPLES The present invention will be described in more detail below with reference to examples. However, the scope of the invention is not limited to such examples. "%" means "% by mass" unless otherwise specified.

[Example 1]
In this example, the apparatus shown in FIG. 11 was used to manufacture an absorbent article sheet having the structure shown in FIGS. 2 and 7(b).
(1) Manufacture of card web Using eccentric core-sheath type conjugate fibers whose core is made of low-density polyethylene (hereinafter also referred to as “LDPE”) and whose sheath is made of polyethylene (hereinafter also referred to as “PE”), the basis weight is A carded web with a weight of 27 g/m ² was produced. This eccentric sheath-core composite fiber had a fineness of 2.3 dtex and a fiber length of 51 mm. This eccentric core-sheath type conjugate fiber is a latently crimped fiber that crimps when heat is applied.
(2) Production of SNS web On a spunbond nonwoven fabric with a basis weight of 9 g/m ² made of polypropylene (hereinafter also referred to as “PP”) fibers with an average fiber diameter of 20 μm, a PP fiber with a basis weight of 5 g/m ² is placed. A meltblown nonwoven fabric was laminated, and a spunbond nonwoven fabric having a basis weight of 9 g/m ² made of PP fibers with an average fiber diameter of 20 μm was further laminated thereon to produce an SNS web having a three-layer structure. The fiber diameter of the constituent fibers of the meltblown nonwoven fabric was 0.8 μm.
(3) Bonding of Card Web and SNS Web An SNS web continuously transported in the same direction was overlaid on a card web continuously transported in one direction, and the two were bonded together by ultrasonic embossing. The linear pressure for ultrasonic embossing was set to 60 N/cm. A sheet precursor was thus obtained. The shape of the joint was a cross.
(4) Heat Treatment of Sheet Precursor Hot air was blown to the sheet precursor by an air-through method while both side edges of the sheet precursor which was continuously conveyed in one direction were fixed by pin tenters. As a result, the eccentric core-sheath type composite fibers forming the card web were crimped and shrunk. As a result, many protrusions were formed on the SNS web. Thus, an absorbent article sheet having the structure shown in FIG. 7(b) was obtained. This absorbent article sheet had stretchability.
The temperature of the hot air was set at 105° C., and the wind speed of the hot air was set at 1.7 m/sec. The shrinkage rate of the sheet precursor was 80% in the conveying direction and 90% in the direction perpendicular to the conveying direction.
(5) Application of water-repellent agent An ethanol solution of Asahi Guard AG-E082, which is a fluorine-based water-repellent/oil-repellent agent available from AGC, was prepared (concentration 1%). After the absorbent article sheet obtained in (4) was immersed in this ethanol solution, it was annealed and dried at 80° C. for 2 hours to impart a water repellent to the sheet.

[Example 2]
In Example 1, the fiber diameter of the constituent fibers of the meltblown nonwoven fabric in the SNS web was set to 2 μm. A sheet for absorbent articles having the structure shown in FIGS. 2 and 7(b) was obtained in the same manner as in Example 1 except for this. This absorbent article sheet had stretchability.

[Example 3]
In this example, the apparatus shown in FIG. 11 was used to manufacture an absorbent article sheet having the structure shown in FIGS.
(1) Manufacture of carded web The same procedure as in Example 1 was carried out.
(2) Manufacture of meltblown composite web An air-through nonwoven fabric with a basis weight of 9 g/m ² made of core-sheath type composite fibers with a core made of polyethylene terephthalate and a sheath made of PE is placed on an air-through nonwoven fabric with a basis weight of 5 g/m ² made of PP fibers. was laminated to produce a meltblown composite web having a two-layer structure. The fiber diameter of the constituent fibers of the meltblown nonwoven fabric was 0.8 μm.
The fineness of the core-sheath type composite fibers constituting the air-through nonwoven fabric was 2.4 dtex, and the fiber length was 51 mm.
(3) Bonding of Carded Web and Meltblown Composite Web A meltblown composite web continuously conveyed in the same direction was overlaid on a carded web continuously conveyed in one direction. The superposition was performed so that the meltblown nonwoven fabric in the meltblown composite web faced the carded web. The rest was the same as in Example 1.
(4) Heat Treatment of Sheet Precursor Same as in Example 1.
(5) Application of Water Repellent Agent The same procedure as in Example 1 was carried out. The absorbent article sheet thus obtained had stretchability.

[Example 4]
In this example, the apparatus shown in FIG. 13 was used to manufacture an absorbent article sheet having the structure shown in FIGS. 3 and 4(b).
(1) Manufacture of SNS web A meltblown nonwoven fabric made of PP fibers with a basis weight of 5 g/m ² is laminated on a spunbonded nonwoven fabric made of PP fibers with an average fiber diameter of 20 µm and having a basis weight of 9 g/m ² , and further above it. A spunbonded nonwoven fabric having a basis weight of 9 g/m ² made of PP fibers having an average fiber diameter of 20 µm was laminated on the web to produce an SNS web having a three-layer structure. The fiber diameter of the constituent fibers of the meltblown nonwoven fabric was 0.8 μm. The three pieces were joined by ultrasonic embossing. The linear pressure for ultrasonic embossing was set to 60 N/cm.
(2) Concavo-convex shaping of SNS web Using the device 50 shown in Fig. 13(a), the SNS web was formed concavo-convex in the procedure shown in Figs. 13(b) and 13(c).
(3) Lamination of spunbond webs In accordance with the procedure shown in Fig. 13(d), a spunbond web having a basis weight of 9 g/m ² made of PP fibers with an average fiber diameter of 20 µm was placed on the unevenly shaped SNS web. placed. Next, a heating element heated to 155° C. was pressed against the spunbond nonwoven fabric to join the spunbond web and the SNS web.
(4) Application of Water Repellent Agent The same as in Example 1 was used. The sheet for absorbent articles thus obtained did not have stretchability.

[Example 5]
In this example, the apparatus shown in FIG. 14 was used to manufacture an absorbent article sheet having the structure shown in FIGS. 2 and 6(b).
(1) Manufacture of Carded Web A carded web was manufactured using core-sheath type composite fibers having a fineness of 1.8 dtex. The core-sheath type conjugate fiber had a core made of polyethylene terephthalate (hereinafter also referred to as "PET") and a sheath made of PE. The mass ratio of core to sheath was 5:5.
(2) Primary Concavo-convex Forming of Card Web Using the device 60 shown in FIGS. did. The pushing depth of the pushing member 65 was set to 2 mm.
(3) Secondary irregularity shaping of card web The card web was subjected to secondary irregularity shaping by blowing hot air onto the card web according to the procedure shown in Fig. 14(e). Hot air was blown twice. The first spraying was performed under the conditions of a temperature of 160° C., a wind speed of 68 m/sec, and a spraying time of 5 seconds. The second spraying was performed under conditions of a temperature of 160° C., a wind speed of 6.0 m/sec, and a spraying time of 5 seconds. The card web after uneven shaping had a fineness of 1.8 dtex and a basis weight of 40 g/m ² .
(4) Lamination of SNS webs A meltblown nonwoven fabric made of PP fibers with a basis weight of 5 g/m ² is laminated on a spunbonded nonwoven fabric made of PP fibers with an average fiber diameter of 20 μm and having a basis weight of 9 g/m ² . A spunbond nonwoven fabric having a basis weight of 9 g/m ² made of PP fibers having an average fiber diameter of 20 μm was laminated thereon to produce an SNS web having a three-layer structure. The fiber diameter of the constituent fibers of the meltblown nonwoven fabric was 0.8 μm. After the hot-melt adhesive was applied to the card web described above, the SNS web was placed on the coated surface, and the SNS web and the card web were joined together.
(5) Application of Water Repellent Agent The same procedure as in Example 1 was carried out. The sheet for absorbent articles thus obtained did not have stretchability.

[Example 6]
In Example 1, the joining pattern between the card web and the SNS web was changed, and the width of the protrusions and the pitch of the protrusions were changed. Except for this, in the same manner as in Example 1, an absorbent article sheet having the structure shown in FIGS. 2 and 7(b) was obtained. The sheet for absorbent articles thus obtained had stretchability.

[Example 7]
In Example 1, as the fibers used for producing the carded web, fibers that did not develop crimps when heat was applied were used. A sheet for absorbent articles having the structure shown in FIGS. 2 and 7(b) was obtained in the same manner as in Example 1 except for this. The sheet for absorbent articles thus obtained did not have stretchability.

[Example 8]
In Example 1, the joining pattern of the card web and the SNS web was changed, and the width of the protrusions and the pitch of the protrusions were changed. A sheet for absorbent articles having the structure shown in FIGS. 3 and 7(b) was obtained in the same manner as in Example 1 except for this. The absorbent article sheet thus obtained had stretchability.

[Example 9]
In this example, a sheet having the structure shown in FIG. 10 was manufactured according to the method shown in FIGS.
(1) Preparation of First Fiber Sheet A spunbond nonwoven fabric made of PP resin having an average fiber diameter of 15 μm and a basis weight of 18 g/m ² was prepared.
(2) Production of First Fiber Sheet A nanofiber layer made of PP resin was formed on one surface of the spunbond nonwoven fabric by an electrospinning method. The basis weight of the nanofiber layer was 3 g/m ² and the average fiber diameter was 500 nm.
(3) Production of the second fiber sheet Two spunbond nonwoven fabrics made of PP resin with an average fiber diameter of 18 µm and a basis weight of 18 g/m ² are used. 15 to produce a composite material 24B shown in FIG. The total basis weight of the elastic filaments was 9 g/m ² for the area of composite 24B. This composite material 24B was passed between a pair of tooth groove rolls 76 and 77 shown in FIG.
(4) Production of Sheet According to the method shown in FIG. 16, the first fiber sheet 23A having the nanofiber layer and the second fiber sheet 24A are superimposed and joined while the second fiber sheet 24A is stretched. and manufactured the sheet.

[Comparative Example 1]
(1) Manufacture of SNS web A meltblown nonwoven fabric made of PP fibers with a basis weight of 5 g/m ² is laminated on a spunbonded nonwoven fabric made of PP fibers with an average fiber diameter of 20 μm and having a basis weight of 9 g/m ² , and further above it. A spunbonded nonwoven fabric having a basis weight of 9 g/m ² made of PP fibers having an average fiber diameter of 20 µm was laminated on the web to produce an SNS web having a three-layer structure. The fiber diameter of the constituent fibers of the meltblown nonwoven fabric was 0.8 μm. The three pieces were joined by ultrasonic embossing. The linear pressure for ultrasonic embossing was set to 60 N/cm.
(2) Application of Water Repellent Agent The same procedure as in Example 1 was carried out. The sheet for absorbent articles thus obtained did not have stretchability.

[Comparative Example 2]
The SNS web obtained in Comparative Example 1 was pressed by a concave-convex forming press machine equipped with a pair of mutually meshing forming plates. The press pressure was 0.4 MPa. A sheet for absorbent articles was obtained in the same manner as in Comparative Example 1 except for this. The sheet for absorbent articles thus obtained did not have stretchability.

〔evaluation〕
The width W, height H and pitch P of the protrusions were measured by the methods described above for the sheets for absorbent articles obtained in Examples and Comparative Examples. Also, the water repellency to the low surface tension liquid was evaluated by the method described above. Table 1 shows the results.
Furthermore, the degree of penetration of the low surface tension liquid into the meltblown layer was evaluated by the method described later. Table 1 shows the results.
Furthermore, the sheets for absorbent articles obtained in Examples and Comparative Examples were incorporated into sanitary napkins, and a dynamic exudation test was performed according to the following procedure to evaluate leakage prevention according to the following criteria. Table 1 shows the results.

[Dynamic seepage test]
The back sheet of Kao Corporation's sanitary napkin "Laurier (registered trademark) F Shiawase Suhada Super Slim Daytime Use" (manufactured in 2019, 22.5 cm) was carefully removed using a cold spray. Instead of the removed backsheet, the sheets for absorbent articles obtained in Examples and Comparative Examples were adhered to the absorbent body by hot-melt. The sheet for absorbent articles was arranged such that the first surface having the uneven structure faced the absorber. A hot melt adhesive was applied to the non-skin side of the sheet for absorbent articles to secure the napkin to the shorts.
The sanitary napkin thus obtained was placed horizontally with the surface sheet facing vertically upward, and an oval injection port (50 mm long diameter, 23 mm short diameter) was placed on the surface sheet. placed. 6.0 g of defiberized horse blood whose viscosity was adjusted was injected from this oval injection port and allowed to stand for 1 minute. The defiberized horse blood was manufactured by Nippon Biotest Co., Ltd. and adjusted to have a viscosity of 8 cp at a liquid temperature of 25°C. Viscosity is a value measured at a rotation speed of 12 rpm with a TVB-10M viscometer manufactured by Toki Sangyo Co., Ltd. using a rotor with a rotor name of L/AdP (rotor code 19).
A sanitary napkin into which defibrinated horse blood was injected was attached to a movable female waist model described in FIG. 9 of JP-A-9-187476, and shorts were attached thereon. After the model was allowed to walk at a speed of 100 steps/min for 1 hour, the shorts and the sanitary napkin were taken out, and the shorts were visually observed to see if horse blood had oozed out.
When the sheets for absorbent articles obtained in Examples and Comparative Examples were incorporated into napkins, the uneven surface of the sheets was arranged to face the absorber. However, in the sheet for absorbent articles obtained in Example 6, the concave-convex forming surface was made to face the outer surface of the napkin.

[Extent of penetration into the meltblown layer]
After the dynamic bleed test described above, the sanitary napkin was removed from the shorts. The non-skin side of the sheet for absorbent articles in the removed sanitary napkin was visually observed. When spots with horse blood reaching the surface of the non-skin side of the sheet for absorbent articles were found, the number of spots was visually counted. If the horse blood does not reach the surface of the non-skin side of the absorbent article sheet, the area where the redness of the horse blood appears darker than the surrounding area when the absorbent article sheet is visually observed from the non-skin side. was selected at 10 locations. Each point was cut in the thickness direction with a razor or the like from the non-skin side, and the cross section was observed with a microscope. When the horse blood permeated throughout the meltblown layer in the thickness direction, the number of spots permeated into the meltblown layer was counted.

As is clear from the results shown in Table 1, the sheets for absorbent articles obtained in each example have water repellency against low surface tension liquids.
In addition, it can be seen that when the sheet for absorbent articles obtained in each example is used as the back sheet of a sanitary napkin, the bleeding of liquid is prevented.

REFERENCE SIGNS LIST 10 Absorbent article sheet 11 Convex portion 12 Concave portion 13 Spunbond layer 14 Meltblown layer 15 SNS layer 16 Joining portion 17 Air-through layer 21 First surface 22 Second surface

Claims (12)

A sheet for absorbent articles in which a plurality of nonwoven fabric layers are laminated,
At least one surface of the sheet has an uneven structure,
A sheet for absorbent articles having water repellency against a liquid having a surface tension of 60 mN/m. 2. The absorbent article sheet according to claim 1, wherein the width of the protrusions in the uneven structure is 0.5 mm or more and 8 mm or less. 3. The absorbent article sheet according to claim 1, comprising a nanofiber layer. 4. The absorbent article sheet according to claim 3, wherein the nanofiber layer has an uneven structure. 5. The absorbent article sheet according to claim 3, comprising said nanofiber layer comprising fibers having a fiber diameter of 1 [mu]m or less. the nanofiber layer comprises a meltblown layer,
6. The absorbent article sheet according to any one of claims 3 to 5, wherein the meltblown layer is arranged between a pair of spunbond layers. The absorbent article sheet according to any one of claims 1 to 6, which has an air-through layer. The absorbent article sheet according to claim 7, wherein the air-through layer contains crimped fibers. An absorbent article comprising an absorbent body and the absorbent article sheet according to any one of claims 1 to 8,
An absorbent article, wherein the sheet for absorbent articles is arranged such that the surface having the concave-convex structure of the sheet for absorbent articles faces the absorber. The absorbent article sheet has a nanofiber layer,
10. The absorbent article according to claim 9, which has a nonwoven fabric layer flatter than the skin-facing surface on the non-skin-facing surface side of the nanofiber layer. 11. The absorbent article according to claim 10, having an air-through layer on the skin-facing side of the nanofiber layer. The absorbent article according to any one of claims 9 to 11, wherein the absorbent article sheet is arranged on the non-skin facing side of the absorbent body.

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