JP2741816B2 - Surface material of absorbent article and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface material for absorbent articles such as sanitary napkins and diapers and a method for producing the same.

[0002]

2. Description of the Related Art In general, absorbent articles such as sanitary napkins and diapers include an absorbent for absorbing liquids such as blood and urine, a surface material covering the surface of the absorbent and applied to the skin, and And a back surface material for covering the back surface of the base material to prevent liquid leakage. The surface material of the absorbent article is required to have a liquid permeability for promptly transferring liquids such as blood and urine to the absorber and absorbing the liquid into the absorber. There is a demand for a liquid return preventing property that does not return the absorbed liquid to the skin side, a dry property that essentially leaves no liquid on the skin, and a shielding property that blocks the color of blood and the like diffused in the absorber.

[0003] Conventionally, in order to meet the above demand, for example, a non-woven fabric which is an aggregate of hydrophobic fine fibers is used, and a space under a hydrophobic atmosphere is formed between the skin and the absorber.
A surface material that reduces the liquid return from the absorber without impairing the liquid permeability (Japanese Patent Application Laid-Open No. 58-18060), and a surface material using a perforated nonwoven fabric to improve the permeability of a high-viscosity liquid ( 6
No. 2-150661) and a surface material in which holes are provided in a hydrophobic liquid-impermeable sheet to reduce liquid return from the absorber (Japanese Utility Model Application Laid-Open No. 54-124398, Japanese Patent Publication No. 57-17).
No. 081, JP-A-57-1340, JP-A-67-1
No. 1-47553, etc.) have been proposed.

Further, among the above-mentioned surface materials, the latter surface material is further improved, and a surface provided with a micro-emboss so that the base surface which is a non-opening portion adheres to the skin and does not give discomfort. Materials have also been proposed.

[0005]

However, in the former surface material described above, the liquid tends to accumulate in the minute space of the fine fiber aggregate, and when the pressure is applied, the accumulated liquid moves to the surface side (skin side). In addition to giving a tactile discomfort such as stickiness and stickiness, there is a drawback of giving visual discomfort such as staining with blood. In addition, although the perforated nonwoven fabric has improved permeability for the high-viscosity liquid, the nonwoven fabric portion is in the base region, so that the liquid easily stays and exhibits the same phenomenon as described above. Increases shear yield stress in the direction along the surface of the material, giving a sense of incongruity when mounted.

The above-mentioned surface material uses a hydrophobic film, and it is necessary to increase the open area for free transfer of the liquid. There was a drawback that the liquid return prevention property was reduced.

Further, the improved surface material of the latter is substantially impervious to moisture, although it has some effect at the initial stage of mounting (at the time of dryness). The effect provided was not obtained, and there was a drawback that it was easy to be uncomfortable, gave uncomfortable feeling to the touch, and caused rash. Furthermore, even if the above-mentioned conventional surface materials (other than those made only of fine fiber aggregates) are all made of a soft material, the shear yield stress in the direction along the surface of the surface material is large, I felt uncomfortable. Therefore, an object of the present invention is to have a liquid permeability that allows the liquid to move freely, a liquid return preventing property that the liquid once absorbed does not return to the skin side, and a feeling of discomfort such as unpleasant touch feeling and unevenness when worn. It is an object of the present invention to provide a surface material of an absorbent article having a tactilely excellent wearability that does not make the user feel sensation and a shielding property that hides the color of the absorbed liquid so that it does not appear on the surface, and a method of manufacturing the same.

[0008]

According to the present invention, there is provided an absorbent article provided with an absorbent body, wherein the surface material is made of a liquid-impermeable material and has a myriad of pores, which covers the surface of the absorbent body. The material includes a myriad of tops each formed of a convex curved surface and not forming a continuous plane, an innumerable bottom each formed of a concave curved surface, and a curved wall connecting the top and the bottom respectively. , Each of the holes is a structure formed by the connected top, the wall, and the bottom, and each having a space between the tops,
Each of the tops is formed in a non-woven structure having a rounded convex shape and a low fiber density and air permeability, and each wall and bottom is formed in a film-like structure having a high fiber density and almost no liquid permeability. The bottom material and / or the wall portion of each of the holes is provided with a liquid permeation opening communicating with the space between the top portions, respectively. The above object has been achieved by providing.

The present invention is also directed to a method of manufacturing a surface material of an absorbent article according to claim 1, as a preferred method of manufacturing the surface material, wherein a number of projection pins and a concave shape formed between the projection pins are provided. The non-woven fabric is supplied to the mold in which the holes are formed, and the fibers are pushed and spread by the projecting pins provided in the mold to form openings for liquid permeation in the bottom of the surface material, and in the bottom and the wall. A film having a high fiber density is formed, and in the opening formed between the projecting pins of the mold, the top portion is left as a nonwoven fabric to form a nonwoven fabric convex curved surface having a low fiber density. And a method for producing a surface material of an absorbent article.

[0010]

The surface material of the present invention has a nonwoven fabric-like structure at the top of the absorbent article, which is in contact with the skin, as a surface material of the absorbent article. It has a mounting property, and each top part has a convex curved surface, so that there is no liquid pool, and since the wall part is formed in a film-like structure, it has a liquid return preventing property and an absorbing liquid shielding property. I have. Furthermore, the surface material of the absorbent article of the present invention has a small shear yield stress in any direction along the surface, and the so-called peach skin, which is capable of following complicated movements in a state where the top is in point contact with the skin, It has a good texture with a cloth-like feel such as silk satin.

[0011]

【Example】

(Embodiment of Surface Material) First, an embodiment of the surface material of the absorbent article of the present invention will be described with reference to the drawings. FIG. 1 is a partially cutaway perspective view of an absorbent article provided with a surface material according to an embodiment of the present invention, and FIG. 2 shows one embodiment of the surface material of the absorbent article of the present invention. FIG. 2A is an enlarged sectional view showing a part of the surface material according to the present embodiment, FIG. 2B is an enlarged plan view of the surface material shown in FIG. A viewed from the front side, and FIG. 3A is a cross-sectional view of a surface material forming die used for manufacturing a surface material of the absorbent article of the present invention, FIG. 3A is a cross-sectional view showing a non-meshing state, FIG. 3B is a cross-sectional view showing a meshing state at the time of molding, and FIG. FIG. 4A is a plan view showing a part of the surface material molding die shown in FIG.
B is a plan view of a female mold, FIG. 5 is a cross-sectional view showing a manufacturing state of the surface material of the absorbent article of the present invention, and FIG. 6 is a view showing physical properties of the surface material of the absorbent article of the present invention. 6A is a side view showing a state where the surface material of the absorbent article of the present invention is pressed with a flat plate, FIGS. 6B to 6E are plan views of the top of the surface material pressed against the flat plate surface, and FIG. , C at low load, D at medium load, and E at high load.

The surface material 1 of the absorbent article of this embodiment is shown in FIG.
As shown in FIG. 2 and FIG. 2, the surface material 1 is made of a liquid-impermeable material and has an infinite number of holes P, which covers the surface of the absorbent article provided with the absorber 2. 1 is
Innumerable tops 3 each formed of a convex curved surface and not forming a continuous plane, innumerable bottoms 4 each formed of a concave curved surface, and a curved wall 5 connecting the top 3 and the bottom 4 respectively. Each of the holes P has a structure formed by the connected top 3, the wall 5, and the bottom 4 and having a space between the tops 3, and each of the tops 3 is rounded. The wall 5 and the bottom 4 are formed into a film-like structure having a high fiber density and almost no air permeability. Each hole P
In the bottom part 4 and / or the wall part 5 in the above, a liquid permeation opening 6 communicating with a space between the top parts 3 is formed.

Here, as the liquid impermeable material (hydrophobic sheet) constituting the surface material 1, a nonwoven fabric web made of any type of resin filament is preferable. For example, a spunbonded nonwoven fabric having a filament of 1 to 2 denier or larger, and its material includes polyester, polyamide, polypropylene, polyethylene and the like. In addition, the above-mentioned resin alone filament, a single filament or a mixture of two or more thereof, or a composite filament composed of two resins, for example, a side-by-side (Side by Side) embraced in a semi-cylindrical shape composed of polyester / polyethylene, polypropylene / polyethylene. type), or a composite filament such as a sheath and core (Sheath Core Type). Also, once filaments are multi-component / multi-layer,
Further, a defibrated filament, a mechanically and thermally crimped filament, or the like is used. These filaments form a web by the usual dry or wet process. In addition, a nonwoven fabric or the like in which filament formation and web formation are simultaneously performed by a melt blown method or the like is also used.

The filaments obtained by the defibration method and the filaments formed by the melt blown method, which will be described below, are extremely fine, having a denier of 1 denier or less, and have a good feel. In addition, the above nonwoven fabric may be used as it is as long as it is a blend or composite of a high and low melting temperature. A nonwoven fabric of a single composition or an extremely high melting temperature (eg, 250
In the case of using a non-woven fabric composed of only a material, a resin or a resin composition having a melting temperature (low melting temperature) lower than the melting temperature of the non-woven fabric by 30 ° C. or more is sprayed or applied in powder, granular or liquid form. Is preferred. The low melting temperature resin and the like are preferably in a combination that easily adheres to the nonwoven fabric. For example, a polyester resin or a vinyl ester resin for an olefin nonwoven fabric, a polyolefin resin alone for a polyolefin nonwoven fabric, or a resin and a plasticizer, a hydrophilizing agent Are preferred.

The color of blood and the like absorbed by the absorber 2 can be shielded from irregular reflection of light by the nonwoven fabric of the top 3 and the shape of the curved wall 5 and the like. Opaque is preferred in terms of shielding. Various means are conceivable as means for making the liquid impermeable material itself opaque. For example, titanium oxide, white pigments such as zinc oxide, calcium carbonate, talc, clay, calcium sulfate, alone or in combination with fillers such as barium sulfate,
These may be added when producing the raw nonwoven fabric, but may also be added to the low melting point resin. The surface material 1 of the present embodiment is manufactured by using the liquid-impermeable material to form a nonwoven fabric portion having a low fiber density and a film portion having a high fiber density as described above. It is.

Next, a preferred shape and physical properties of the surface material 1 of the present invention will be described with reference to FIGS. A hole P is formed in the surface material 1, and the hole P includes a top 3, a bottom 4, a wall 5, and an opening 6 for liquid permeation. The top portion 3 is a portion that is in direct contact with the skin, and is formed into a rounded convex non-woven fabric having a thickness smaller than the thickness of the raw fabric non-woven fabric N and a low fiber density. The top 3 and the top 3
The space is connected by the wall 5 and the bottom 4, but the top 3 is not a continuous layer. The wall 5 is formed downward from the top 3 to the bottom 4 where the liquid permeation opening 6 is formed. The wall portion 5 has a lower fiber density near the top portion 3 and gradually changes from a film shape near the bottom portion 4 to a non-woven fabric shape at the top portion 3.

The distance L between the top 3 and the top 3
Is preferably set in the range of 0.05 mm to 8 mm, more preferably in the range of 0.2 mm to 5 mm. Further, when the surface material 1 of this embodiment is pushed by the flat plate Y from above, the top 3 is flattened to the flat plate Y according to the load, and FIGS.
Contact as shown in FIG. FIG. 6B shows the state when no load is applied, and FIG.
Is a low load (0.5 to 1.0 g / cm ² ), (D) is a medium load (30 to 50 g / cm ² ), and (E) is a high load (80
１００100 g / cm ² ). The perimeter of the contact surface shape Z at each load is 0.5 g / cm
^The thickness is preferably 0.1 mm to 5 mm under ^two loads and 0.3 mm to 15 mm under 50 g / cm ² load. The fiber density in the top 3 is preferably ^{5g / m 2 ~100g / m 2} , particularly preferably ^{15g / m 2 ~50g / m 2} . 5g
/ Small, sufficient shape retention and good feel than m ² is because can not be obtained, because not obtained sufficient breathability and good feel and greater than 100 g / m ^2.

The fibers in the wall 5 and bottom 4 Density is preferably ^{15g / m 2 ~300g / m 2} , particularly preferably ^{20g / m 2 ~100g / m 2} . 15 g / m ²
If the amount is less than this, a sufficient film shape cannot be obtained, and if it is more than 300 g / m ² , the density becomes unnecessarily high.

The perimeter of the liquid permeation opening 6 (which connects the bottom end of the wall) is preferably 0.1 mm to 15 mm.
More preferably, it is 5 mm to 5 mm.

The number of the openings 6 for liquid permeation is 2 / cm ^2-
Preferably, the number is 100 / cm ² . That is, when the periphery of the opening 6 is small and the opening density is small, the liquid permeability is substantially inferior, and when the periphery of the opening 6 is too large, the liquid return prevention is inferior. In consideration of these, the aperture density and the aperture circumference are set. In addition, on the back surface of the absorber 2, a back material 8 (see FIG. 1) that covers the back surface and prevents liquid leakage is disposed.

Next, the operation of the absorbent article using the surface material 1 of the present embodiment at the time of use will be described.
In the mounted state of the absorbent article provided with, the blood, urine, and the like migrate from the surface material 1 to the absorber 2 and are absorbed by the absorber 2. At this time, in addition to having the liquid permeability through the liquid permeable apertures 6, the surface material 1 has a rounded convex shape so that the liquid does not accumulate even though it is a nonwoven fabric-like filament aggregate, and Because of its moisture permeability, it gives the wearer a dry feeling and a silky feel. Furthermore, the top 3 is deformed due to a change in the mounting pressure, and the contact area with the skin is increased or decreased, so that the wearer does not feel uncomfortable while having a fit.

By setting the top 3, the wall 5, and the hole 4 to the above-mentioned shapes, even if a material having a substantially high elastic modulus is used, the material has excellent elasticity and compressive elasticity, and has a low shear yield stress. Since it becomes small, the shearing force is small in any direction along the surface of the surface material 1, and the surface material can follow the complicated movement of the wearer while the top 3 is in point contact with the skin, without causing a mounting displacement. Even when in close contact with skin, it does not give stickiness or discomfort. Further, it is preferable that the top portion 3 and the wall portion 5 shield the opening 6 for liquid permeation by 10% or more, so that not only the shielding property is improved,
Liquid return prevention is also improved.

(Embodiment of Method of Manufacturing Surface Material) Next, one embodiment of the method of manufacturing the surface material 1 according to the above embodiment will be described.
This will be described with reference to FIGS. 3, 4, and 5. FIG. 3 is a cross-sectional view of the surface material forming mold, FIG. 4 is a plan view showing a part of the surface material forming mold in a developed state, FIG. 4A is a plan view of a male mold, and FIG. FIG. 5 is a plan view, and FIG. 5 is a process explanatory view showing one embodiment of the method for producing a surface material according to the present invention. still,
In the developed view of FIG. 4, the male mold and the female mold rotate in the directions of the arrows, respectively. First, the male mold 9 and the female mold 10 used in the production method of the present invention will be described. The male mold 9 and the female mold 10 are both formed in a drum shape, and the shape to be formed on the surface material is formed on the peripheral surface thereof. The male mold 9 and the female mold 10 are preferably made of a metal having excellent toughness and heat resistance, because the raw nonwoven fabric is heated / pressurized.

FIG. 3 is a sectional view of the male mold 9 and the female mold 10 in a state where the male mold 9 and the female mold 10 are developed in a plane. In the sectional view, the male mold 9 has a large number of projecting pins 11 formed thereon. The projecting pins 11 are arranged at substantially equal intervals, and the tip is formed in a conical shape. The projecting pin 11 forms a liquid permeable opening 6 in the surface material in cooperation with a female pin hole 14 described later.
As the shape of the protruding pin 11, a circle, an ellipse, a triangle, a square, a hexagonal column or a cone is used, and a cone is preferable in order to easily penetrate the raw nonwoven fabric N. It should be noted that the shape of the opening 6 formed by the projection pin 11 is not limited to a completely transferred shape of the projection pin 11. For example, even if a prism or a pyramid is used, the shape may be rounded.

Openings 13 are formed between the projecting pins 11, and form the tops 3 on the surface material in cooperation with a female projecting portion 17 described later. The slope 13 is formed inside the opening 13. The opening 13 is preferably circular or elliptical. However, the opening of the cavity 13 may be square from the viewpoint of mold production, as long as the top 3 of the molded product has a rounded shape. These projection pins 11,
The size and the like of the opening 13 are determined by the opening 6, the top 3,
It is determined by the dimensions of the bottom 4 and the wall 5. still,
The male inclined surface 12 does not need to be uniform around the entire circumference of the projecting pin 11 and the pin hole 14, like the female inclined surface 15 described later. It is preferable from the viewpoint of reducing the shear yield stress of the surface material to impart flexibility and shielding the liquid that has been transmitted and absorbed.

On the other hand, the female die 10 is formed with a pin hole 14 meshing with the projection pin 11. This pin hole 14
Needless to say, considering the thickness of the surface material 1,
1, the entire inner peripheral wall of the pin hole 14 does not need to be in close contact with the entire outer peripheral wall of the protruding pin 11, but rather has to be partially adhered due to the softness of the surface material and the provision of liquid-conducting properties. It is preferable that there is a portion that is not completely formed into a film. In addition, an inclined surface (taper) 15 is formed around the opening of the pin hole 14, so that the burden on the surface material 1 generated when forming the opening is reduced. Pin hole 1
Between the four, a flat portion 16 and a projection 17 are formed, and the raw material nonwoven fabric is pushed up by the projection 17 to form a rounded top 3 on the surface material 1 together with the opening 13. As described above, since the projections 17 are configured to slightly push up the raw nonwoven fabric N, the top portions 3 having the raw nonwoven shape as they are can be formed at corresponding portions. The flat portion 16 is blocked by the pin hole inclined surface 15 and the projection 17 or is connected to such an extent that at least a continuous flat portion is not formed in the molded product.

Using the rotating drums of the male mold 9 and the female mold 10, the surface material 1 of this embodiment is manufactured as follows. FIG.
As shown in the figure, the raw non-woven fabric N is supplied to the surface of the male mold 9 of the upper rotating drum, and the projection pin 11 is penetrated to form an opening 6 in the raw non-woven fabric N. To the fitting part of. Here, an opening 6 for liquid permeation is formed in the bottom 4 of the surface material 1 by the projection pin 11 provided on the male die 9, and the formation of the opening 6 causes the fibers to be pushed up, so that the bottom 4 and the wall are formed. The portion 5 is formed into a film having a high fiber density. At this time, it is preferable that the projection pins 11 of the male mold 9 are heated, and in this heating method, the heat is transmitted from the outside by radiant heat such as far-infrared rays at a portion not in contact with the nonwoven fabric, rather than by heat transfer from the inside of the male mold. The method is preferred.

The temperature of the projecting pin is preferably in a range where the raw nonwoven fabric N does not melt and flow under no load. The female mold 10 is controlled at a lower temperature than the male mold 9. Subsequently, the projections 17 of the female die 9 push up the raw fabric non-woven fabric corresponding to the openings 13 formed between the male projection pins 11 to form the top portions 3. The nonwoven fabric is left as a raw nonwoven fabric and formed into a nonwoven fabric with a low fiber density and a rounded convex curved surface. Before supplying the raw nonwoven fabric N to the male mold 9, a low-melting-point resin is applied or sprayed on the nonwoven fabric and / or the mold to supply the raw nonwoven fabric to the mold.
It is preferred to heat and / or press the nonwoven.

By applying the low melting point resin in this manner, it is possible to form a good-touch film on the surface material 1. In particular, when a nonwoven fabric of a single composition or a nonwoven fabric made of only a material having an extremely high melting temperature (for example, 250 ° C) is used, a resin or a resin composition having a melting temperature (low melting temperature) lower than the melting temperature of the nonwoven fabric by 30 ° C or more. What is formed by applying or spraying an object in powder, granular or liquid form is preferred.

As such a melting temperature resin, a combination which easily adheres to a nonwoven fabric is preferable. For example, a polyester resin or a vinyl ester resin is used for a polyester nonwoven fabric, and a polyolefin resin alone or a resin and a plasticizer are used for a polyolefin nonwoven fabric. It is preferable to use a composition such as a hydrophilizing agent. The pressurization may be performed at the same time as heating, or may be performed without heating. The pressure acting on the raw nonwoven fabric N is preferably 3
0 to 600 kg / cm ² , particularly preferably 100 to 40 kg / cm ² .
It is 0 kg / cm ² . According to the manufacturing method of this embodiment, the above-described nonwoven fabric of the present invention can be continuously and suitably manufactured.

Next, a specific example in which the surface material 1 is actually formed will be described. (1) Regarding the male mold 9, the projection pin 11: diameter 0.7mm, length 1.5mm, pitch 2.
0mm. Void 13: diameter 1.2 mm, depth 2.5 mm, major axis of opening 1.
5mm, minor diameter of opening 1.1mm. The inclination angle 45 of the inclined surface 15
Every time.

(2) Regarding the female mold 10, the pin hole 14 is 0.8 mm in diameter, the major axis of the opening is 1.5 mm, and the minor axis of the opening is 1.1 mm. (3) Others The elliptical inclined surface of the male type 9 and the elliptical inclined surface of the female type are 70 degrees × 11.
A steel mold having a shape crossed at 0 degrees was used.

(4) Raw nonwoven fabric N Core material: polyethylene terephthalate (PET). Sheath material: polyethylene (PE). Both are 2 denier, 51 mm long, and have a basis weight of 20 g / m ² . (5) Manufacturing process The projecting pin is heated to 130 ° C. by a far-infrared heater, and LD-PE having a melting point of 102 ° C. is formed on the inclined surface 15 around the female pin hole.
A 2% blend of polyoxyethylene (10 mol) lauric acid monoester was melt-coated so as to have a thickness of about 5 μm, the mold temperature was set to 80 ° C., and the raw nonwoven fabric N was subjected to male mold 9 and female mold 1.
0 and pressure pressed for about 2 seconds. The resulting apparent thickness was about 1 mm.

(6) Evaluation of obtained product A sanitary napkin as shown in FIG. 1 was manufactured using the surface material 1 obtained as described above. As compared with the napkins for use, it was excellent in absorptivity, had a dry feeling, and had good fit following the movement of the wearer, despite the weak mounting pressure, and did not make the user feel uncomfortable. The present invention is not limited to the above-described embodiment, and can be variously modified without departing from the gist of the present invention. For example, the opening for liquid permeation is not limited to being formed at the bottom, and may be formed only at the wall or at the bottom and the wall.

[0035]

The surface material of the absorbent article according to the present invention has a liquid permeability that allows the liquid to move freely, and has a liquid return-preventing property that does not cause the once absorbed liquid to return to the skin side. It has a wearability that sometimes does not cause discomfort such as unpleasant touch and unpleasant feeling, and a shielding property that hides the color of the absorbed liquid so that it does not appear on the surface. Further, according to the method for producing a surface material of an absorbent article of the present invention, a surface material having the above-described effects can be efficiently produced.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of an absorbent article provided with a surface material according to an embodiment of the present invention.

FIG. 2 shows an embodiment of the surface material of the absorbent article of the present invention, FIG. 2A is an enlarged sectional view showing a part of the surface material according to the embodiment, and FIG. It is an enlarged plan view of the state which looked at the surface material shown in A from the front side.

3 is a cross-sectional view of a surface material forming die used for manufacturing a surface material of the absorbent article according to the present invention. FIG. 3A is a non-meshed state, and FIG. 3B is a cross-sectional view showing a meshed state during molding. FIG.

4 is a developed plan view showing a part of the surface material molding die shown in FIG. 3, FIG. 3A is a plan view of a male mold, and FIG. 3B.
Is a female plan view.

FIG. 5 is a cross-sectional view showing a manufacturing state of a surface material of the absorbent article of the present invention.

6 is a view showing physical properties of a surface material of the absorbent article of the present invention, and FIG. 6A is a side view showing a state where the surface material of the absorbent article of the present invention is pressed with a flat plate, and FIGS. 6B to 6E. FIG. 6B is a plan view of the top of the surface material pressed against the flat plate surface, FIG. 6B shows no load, C shows a low load, D shows a medium load, and E shows a high load.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Surface material P hole part 2 Absorber 3 Top part 4 Bottom part 5 Wall part 6 Liquid permeation opening 8 Back surface material 11 Projection pin 12 Vent hole inclined surface 14 Pin hole 15 Pin hole inclined surface

Claims (3)

(57) [Claims] 1. A surface material, which is made of a liquid-impermeable material and has an infinite number of holes, which covers the surface of the absorbent body of the absorbent article provided with the absorbent body, wherein each of the surface materials has a convex curved surface. Comprising a myriad of tops that do not form a continuous plane, an myriad of bottoms each consisting of a concave curved surface, and a curved wall connecting the top and the bottom respectively. A structure formed by the connected top, the wall, and the bottom, and each having a space between the tops, wherein each of the tops is a rounded convex shape and has a low fiber density and a gas-permeable nonwoven structure. Each wall and bottom are formed in a film-like structure having a high fiber density and almost no liquid permeability, and the bottom and / or the wall in each of the holes have the top portion respectively. Surface material of the absorbent article, wherein a liquid-transmissive apertures which space communicates with the is formed. 2. The method for producing a surface material of an absorbent article according to claim 1, wherein the nonwoven fabric is supplied to a mold having a large number of projection pins and a concave hole formed between the projection pins. The projecting pins provided in the mold, spread the fibers to form openings for liquid permeation at the bottom of the surface material, and form a film having a high fiber density at the bottom and walls, A method of manufacturing a surface material for an absorbent article, wherein a non-woven fabric-like convex curved surface having a low fiber density is formed by leaving the top portion as a non-woven fabric in an opening formed between projection pins. 3. Before supplying the nonwoven fabric to the mold, a low-melting resin is applied or sprayed on the nonwoven fabric and / or the mold, and the nonwoven fabric is heated and / or heated while supplying the nonwoven fabric to the mold.
3. The method for producing a surface material of an absorbent article according to claim 2, wherein the pressure is applied.