JP3205360B2 - 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 and a light-blocking property that blocks the color of blood or the like diffused in the absorber.

Conventionally, in order to meet the above demand, for example, a nonwoven 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, thereby impairing liquid permeability. In addition, pores are provided in a surface material (see Japanese Patent Application Laid-Open No. 58-18060) in which liquid return from the absorber is reduced and a liquid-impermeable hydrophobic sheet is used to reduce liquid return from the absorber. Surface material (Japanese Utility Model Application Laid-Open No. 54-124398, Japanese Patent Publication No. Sho 57-17081, Japanese Patent Application Laid-Open No. Sho 57-13)
No. 40, JP-A-61-45753, etc.).

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 easily accumulates in the minute space in the fiber assembly, and the accumulated liquid moves to the surface side (skin side) when pressure is applied. 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.

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. Furthermore, what improved the latter surface material mentioned above,
Although there are some effects at the initial stage of mounting (at the time of drying), there is a disadvantage that once wetted with the liquid, the effect of providing micro-emboss is hardly obtained.

Furthermore, even if the above-mentioned conventional surface materials are made of a flexible material, the shearing force in the direction along the surface of the surface material is large, and there is a sense of incongruity upon mounting. Therefore, an object of the present invention is to have a liquid permeability that allows a liquid to move freely, and to prevent liquid from returning to the skin side once the liquid has been absorbed, and to have a wearability that does not make the user feel uncomfortable when worn. Another object of the present invention is to provide a surface material of an absorbent article having a shielding property for hiding the color of the absorbed liquid so as not to appear on the surface, and a method for producing the same.

[0008]

The present invention SUMMARY OF THE INVENTION, in the surface material and having a myriad of holes Do Ri from the liquid-impermeable material covering the surface of the absorber of an absorbent article having an absorbent body, said surface Each of the materials protrudes upward from the upper surface of the surface material.
It has innumerable tops each of which has a protruded curved surface, countless bottoms each of which has a concave curved surface, and a curved wall portion that connects the top and the bottom respectively, and the holes are connected to each other. A structure formed by the top, the curved wall and the bottom, and having a space between the tops, wherein a maximum diameter between the curved walls in each of the holes is a minimum diameter of the space between the tops. And the bottom and / or the curved wall in each of the holes are
The above object has been achieved by providing a surface material of an absorbent article, wherein an opening for liquid permeation communicating with the space between the top portions is formed.

Further, the present invention provides a preferred method for producing the above surface material, comprising supplying a surface material molding resin to one surface of a surface material molding die made of a spirally knitted wire mesh, and forming the surface material molding resin. A sheet having a hole at a position corresponding to the space between the wires of the wire mesh in a shape along the surface shape of the surface material molding die by performing vacuum suction from the other surface of the mold. It is intended to provide a method for producing a surface material of an absorbent article, characterized in that the surface material is molded into an absorbent article.

[0010]

When the surface material of the present invention is used as a surface material of an absorbent article, the surface material of the present invention is formed on the upper surface of the surface material.
Countless tops each formed of a convex curved surface protruding upward from above, countless bottoms each formed of a concave curved surface, and a curved wall portion connecting the top and the bottom respectively (hereinafter simply referred to as simply
Comprising also referred) and the wall portion, the respective holes, said top portion connected respectively, a structure having a space between each formed and said top by the wall portion and the bottom portion,
The maximum diameter between the walls in each hole is larger than the minimum diameter of the space between the tops, and the bottom and / or the wall in each hole has a space between the top and a space between the tops, respectively. Since the opening for communicating liquid is formed, the space for holding the liquid is larger and the direction along the surface of the surface material (plane direction) as compared with the case where the wall is formed vertically or simply tapered. When it is pulled, the liquid permeation opening is deformed so as to be closed, and has a liquid return preventing property of preventing the liquid once absorbed by the absorber from returning to the skin side. Even when pressure is applied, the wall is curved to relieve this stress, thereby preventing the space between the tops and the liquid permeation opening from being closed, and at the same time, allowing the liquid to flow from the space between the tops to the liquid permeation opening. Performs the function of guiding to the hole, and the curved wall portion serves as an absorber during the deformation. It has a shielding property to shield the collected liquid, and also has a small shearing force in any direction along the surface of the surface material. And a good texture showing the touch of

[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. 1A to 3
1A and 1B show an embodiment of the surface material of the absorbent article of the present invention, FIG. 1A is a perspective view of the absorbent article provided with the surface material according to the embodiment with a part cut away, and FIG. , An enlarged partial cross-sectional perspective view showing one hole of the surface material shown in FIG.
1C is a diagram showing each dimension of one hole of the surface material shown in FIG. 1B, FIG. 2A is a partially enlarged plan view of the surface material according to the present embodiment, and FIG. FIG. 3C is a partially enlarged perspective view when the surface material shown in FIG. A is viewed from the back side, and FIG. 3A is FIG.
7A to 7C are partially enlarged plan views of spiral knitted wire meshes for forming the surface materials shown in FIGS.

The surface material 1 according to this embodiment is a surface material made of a liquid-impermeable material covering the surface of the absorbent body 2 of the absorbent article provided with the absorbent body 2 and having an infinite number of holes P. Specifically, the molten resin is wrapped in a right-handed or left-handed spiral knitted mesh 7 (see FIGS. 3A and 3B).
(See FIG. 2) and a sheet having a hole at a position corresponding to the space between the wires of the spiral knitted metal mesh 7.

That is, as shown in FIGS. 2A and 2B, the upper surface of the surface material 1 is formed in a shape following the surface shape of the wire material located at the uppermost part of the spiral knitting wire mesh 7.
An innumerable top 3 consisting of a convex curved surface protruding upward from G, an innumerable bottom 4 falling into the space between the wires of the spirally woven wire mesh 7 and formed into a concavely curved surface, and a wire between the wires of the spirally woven wire mesh 7. And a curved wall 5 connecting the top 3 and the bottom 4 each formed into an inclined curved surface or a step-shaped curved surface in the process of falling into the hole. It is a structure formed by the top part 3, the wall part 5, and the bottom part 4, and has a space between the top parts 3, respectively. The maximum diameter between the wall parts 5 in each hole P is the space between the top parts 3. Are formed in the bottom portion 4 and / or the wall portion 5 of each of the holes P, and the liquid permeation holes 6 are formed so as to communicate with the spaces between the top portions 3, respectively. Further, in the present embodiment, each of the holes P is formed so as to be surrounded by the four tops 3.

When the surface material is manufactured, the shape of the wall portion 5 can be adjusted by appropriately selecting the resin composition and the manufacturing conditions such as the viscosity of the resin at the time of melting and the direction of vacuum suction. "Spiral shape" corresponding to the shape of 7
It is also possible to form it. Furthermore, if the flexibility of the periphery of the liquid permeation opening 6 is made high, this part acts as if it were a valve, so that the liquid conductivity to the absorber 2 and the ability to prevent liquid return can be enhanced. .

The liquid impermeable material (hydrophobic sheet) constituting the surface material 1 includes polyolefins, copolymers of olefins with other vinyl monomers such as acrylates and vinyl acetate, polyesters, Hydrophobic thermoplastic resin sheets such as polyamides may be mentioned, but among these, from the viewpoint of texture, handling, a copolymer of polyolefin or olefin and other monomers, or a polymer blend-based hydrophobic thermoplastic resin sheet is preferred. preferable.

[0016] The liquid impermeable material is preferably opaque. The shape of the top part 3, the bottom part 4, the curved wall part 5 and the like can block the color of the liquid such as blood and urine absorbed by the absorber 2, but the liquid impermeable material itself is opaque. It is more preferable from the viewpoint of shielding properties. Various means are conceivable as means for making the liquid impermeable material itself opaque. For example, white pigments such as titanium oxide and zinc oxide, and fillers such as calcium carbonate and clay are used alone or in combination and added during the molding process of the surface material 1.

Further, as shown in FIGS. 1B and 2B, the top 3 of the surface material 1 has a rounded shape, and has a convex curved surface so as to give a soft and dry feeling by being in point contact with the skin. Is preferred. Next, preferred dimensions of the surface material 1 of the present invention will be described with reference to FIG. 1C.

The surface material 1 has a surface portion and an opening portion for liquid permeation. The surface portion is composed of a top 3 which projects out of an upper surface G, the thickness thereof is represented by L _5. The liquid permeation opening is a portion extending from the upper surface G to the bottom 4 extending downward, and the thickness thereof is equal to the distance L from the upper surface G to the liquid permeation opening 6.
It is represented by the sum L ₆ + L ₇ of the height difference L ₇ between the opening 6 for liquid permeation ₆ and the opening 6 for liquid permeation. L ₆ + L ₇ are Shi preferred to be larger than L ₅
No.

The distance L ₂ between the tops 3 is 0.05 mm to 5 mm.
mm, preferably 0.2 mm to 3 mm.
It is more preferable to set the range of mm, also the minimum diameter L ₄ between the top 3 is preferably set in a range of 0.02～2.0Mm, particularly set in a range of 0.1~1.0mm Is more preferable. Maximum diameter L ₃ between the wall portions 5, 0.
It is preferably set in the range of 0.05 to 5.0 mm, and more preferably set in the range of 0.2 to 3.0 mm.

By setting the maximum diameter L ₃ between the wall portions 5 to be larger than the minimum diameter L ₄ between the top portions 3, blood and the like absorbed by the absorber can be effectively blocked visually. . Also, the projection height L of the top 3 from the upper surface G of the surface material 1
₅ is preferably set in the range of 0.02 to 2.0 mm, more preferably in the range of 0.1 to 1.0 mm.

The distance L ₆ from the upper surface G of the surface material 1 to the opening 6 for liquid permeation is preferably set in the range of 0.01 to 5.0 mm, and particularly preferably in the range of 0.1 to 2.0 mm. It is more preferable to set. The height difference L ₇ of the opening 6 for liquid permeation is
It is preferably set in the range of 0 to 2.0 mm, and more preferably set in the range of 0.1 to 1.0 mm.

The diameter L _{8 of the} opening 6 for liquid permeation is 0.02 to 0.02.
It is preferably set to a range of 2.0 mm, particularly 0.1 mm
More preferably, it is set in the range of 1.0 mm to 1.0 mm. By setting the dimensions of the surface material 1 as described above, even if the material is excellent in elasticity and substantially rigid, excellent elasticity will be exhibited. The line connecting the center point y of the center point x and the liquid-transmitting opening 6 of minimum diameter L ₄ parts between the top 3, the angle α formed by the upper surface (horizontal surface) G of the surface material, 90 ° to 30
° is preferably set in the range of, especially 60 ° ~ 45
It is more preferable to set the angle in the range of °.

Further, it is preferable that the top portion 3 and the curved wall portion 5 shield the liquid permeation opening 6 by 10% or more, so that not only the shielding property is improved but also the liquid is returned. The prevention is also improved. Opening area of the liquid passage for opening 6 is preferably 0.02mm ² ~9mm ^2. If the opening area is smaller than 0.02 mm ² , the liquid permeability is poor, and if it is larger than 9 mm ² , the liquid return property is poor. The opening density of the liquid-permeating openings 6 is limited by the above-mentioned opening area from the viewpoint of the liquid permeability and the property of preventing the liquid from returning back, but is preferably ² / cm ² to 200 / cm ² .
That is, a small opening area, because if the opening density is small is inferior substantially liquid-permeable and sheet formability is poor according to the opening area is increased, in consideration of these two / cm ² It is preferable to set the number to 200 / cm ² .

A back surface member 8 (see FIG. 1) for covering the back surface and preventing liquid leakage is disposed on the back surface of the absorber 2. Next, the operation of the surface material 1 of the present embodiment will be described. When the absorbent article provided with the surface material 1 is mounted, 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 the surface material 1 having liquid permeability through the liquid permeable opening 6, the top part 3 is deformed due to a change in the mounting pressure to increase or decrease the contact area with the skin. Together with the constricted shape, it has a function of promoting the transfer of blood, urine, and the like to the absorber 2 side, as in the transfer of food by peristaltic movement of the esophagus.

Further, the surface material 1 is deformed so as to close the liquid-permeating opening 6 when a pulling force acts in the direction along the surface thereof.
The shape returns to its original shape. That is, only when a large force acts upon the mounting of the absorbent article (only when a force that returns the liquid once absorbed in the absorbent body 2 to the skin side acts), the surface material 1 is opened through the liquid permeating opening. 6, so that the liquid from the absorber 2 to the skin side is reliably prevented from returning.

The curved wall 5 of the surface material 1 is absorbed by the absorber 2 together with the top 3 because the maximum diameter L _{3 of the} wall 5 is larger than the minimum diameter L _{4 of} the top 3. It has the function of reliably blocking the color of blood, urine, etc. Also, the bottom 4 and / or
Alternatively, the liquid-permeable aperture 6 is provided in the curved wall portion 5 and the maximum diameter L _{3 of the} wall portion 5 is larger than the minimum diameter L ₄ of the top portion 3. The shearing force is small in any of the directions along the surface, and the surface material 1 can follow the complicated movement of the wearer while the top 3 is in point contact with the skin, and the surface material 1 adheres to the skin without causing displacement and gives an uncomfortable feeling. Absent.

4A to 4C show another embodiment of the surface material 1. FIG. The surface material 10 of the other embodiment is formed by spirally knitting a molten resin along a surface shape of a spiral knitted wire mesh 70 (see FIGS. 5A and B) in which spirals alternately wound right and left are connected by a strong bone (rod). And formed into a sheet having holes at positions corresponding to the holes between the wires of the spiral knitting wire mesh 70, and similarly to the surface material 1, each sheet is formed from the upper surface of the surface material 10 upward. Toward
Each of the holes P includes an innumerable top portion 30 having a protruding curved surface, an innumerable bottom portion 40 each having a concave curved surface, and a curved wall portion 50 connecting the top portion 30 and the bottom portion 40, respectively. Is the top 3 connected to each other
0, a structure formed by the wall portion 50 and the bottom portion 40 and each having a space between the top portions 30. The maximum diameter between the wall portions 50 in each of the holes P is the maximum diameter of the space between the top portions 30. The liquid permeation opening 60 which is larger than the small diameter and is provided in the bottom portion 40 and / or the wall portion 50 in each of the hole portions P and communicates with the space between the top portions 30 respectively.
Are formed, and the same effect as that of the surface material 1 can be obtained. (Embodiment of Method of Manufacturing Surface Material) Next, an embodiment of a method of manufacturing the surface materials 1 and 10 will be described with reference to the drawings.

FIGS. 6A to 6E are process explanatory views showing one embodiment of the method for producing a surface material according to the present invention. The manufacturing method of this embodiment is to manufacture the surface materials 1 and 10 by melt molding of a thermoplastic resin, and to use the spiral knitting wire mesh 7 shown in FIGS. 3A and 3B as a surface material forming die, or FIG. A spiral knit wire mesh 70 shown in FIG.

The material of the spiral knitted metal meshes 7 and 70 is preferably a metal because toughness and cooling properties for solidifying the molten resin are required. When a metal is used as the material of the spiral knitted wire meshes 7 and 70, it is preferable to coat with a resin from the viewpoint of anticorrosion properties and releasability.
In addition to the above-mentioned spiral knitting meshes 7 and 70, a spiral knitting mesh using a plurality of twisted wires, a spiral knitting mesh having an uneven shape, and a spiral knitting mesh combining a wire having a different thickness are exemplified.

According to the manufacturing method of this embodiment, the sheet-like molten resin 9 (see FIG. 6A) as the resin for molding the surface material is used.
For example, the sheet-like molten resin 9 is supplied along the surface of the wire 7a, 7b of the spiral knitted wire mesh 7 by supplying from the upper portion of the spiral knitted wire mesh 7 and suctioning the vacuum from the lower portion of the spiral knitted wire mesh 7. The wire is cooled and solidified by the wires 7a and 7b, and is shaped into a shape following the surface shape of the spiral knitted wire mesh 7 and having a hole at a position corresponding to the space between the wires of the spiral knitted wire mesh 7. I'm doing like that.

To explain this in detail, as shown in FIG. 6A, a sheet-like molten resin 9 is supplied from the upper part of the spiral mesh 7 by a T-die (not shown), and a vacuum is applied from the lower part of the spiral mesh 7. When suctioned, first, FIG.
As shown in FIG. 3, the sheet-like molten resin 9 contacts the uppermost wire 7a of the spiral knitted metal mesh 7 to be cooled and solidified, and then the portion of the sheet-like molten resin 9 not in contact with the wire 7a is shown in FIG. As shown in the drawing, the sheet-like molten resin 9 which is deformed by the vacuum suction force and contacts the lower wire 7b to be cooled and solidified, and thereafter does not contact the lower wire 7b, as shown in FIG. Then, while being concavely deformed and solidified by air cooling, a part thereof is spread and broken as shown in FIG. In this molding process, the maximum diameter L ₃ of the wall 5 becomes larger than the minimum diameter L ₄ of the top 3 as the sheet-like molten resin 9 moves into the spiral knitted metal mesh 7 by the vacuum suction force. In addition, in this embodiment, the bottom 4 and the curved wall 5 are formed even in a portion that is shielded from directly above, and a liquid-permeation opening 6 is formed in the portion that is twisted in a spiral shape. Will be. As a result, the surface material 1 as shown in FIGS. 2A to 2C is formed, and the surface material 1 is released from the spiral knitted wire mesh 7 using the compressed air flow from the same side as the vacuum suction side.

By using a spiral knitting wire mesh 70 as shown in FIGS. 5A and 5B, the surface material 10 having the shape shown in FIGS. 4A to 4C can be formed. Further, a film may be used as the surface material molding resin instead of the molten resin 9 supplied from the T-die. In this case, the film is supplied to the spiral knitted mesh 7 in a state where the film is heated and softened in advance, or the film is heated and softened after being supplied to the spiral knitted mesh 7. (Other Examples of Surface Material and Manufacturing Method Thereof) According to the examples of the surface materials 1 and 10, the case where the surface material of the present invention is formed by using the spiral knitted metal meshes 7 and 70 has been described. However, the surface material of the present invention is not limited to this. In the surface material of the present invention, each of the holes P is formed by the connected top 3, wall 5 and bottom 4, respectively, and is located between the tops 3 respectively. It is a structure having a space, and the maximum diameter between the wall portions 5 in each of the hole portions P is larger than the minimum diameter of the space between the top portions 3, and the bottom portion 4 in each of the hole portions P and / or The wall 3 has the top 3
It is sufficient that a liquid permeation opening communicating with the space therebetween is formed, and the manufacturing method is not particularly limited.

According to the embodiment of the method for manufacturing the surface materials 1 and 10, the method for manufacturing the surface material according to the present invention is shown in FIG.
Although the case where the spiral knitting wire mesh 7 shown in A and B and the spiral knitting wire mesh 70 shown in FIGS. 5A and 5B are used is shown,
The method of manufacturing the surface material of the present invention is not limited to these, and any method may be used as long as it can manufacture the surface material having the above-described structure using the spiral knitted metal mesh as the surface material forming die. (Experimental Example) Next, an experimental example in which the surface material 1 is formed based on the above embodiment will be described.

The spiral knitted wire mesh 7 has a wire diameter of 0.3
A 26-mesh wire mesh (SP-26-0.3, manufactured by Kansai Wire Mesh Co., Ltd.) consisting of spirals in the same direction with a diameter of 1 mm was used, and LD-PE melt containing 5% TiO ₂ as the sheet-like molten resin 9 was used. Resin was used. When the sheet-like molten resin 9 was supplied from the T-die onto the spiral knitted wire mesh 7 so as to be 25 g / m ² , while vacuum suction was performed from a lower portion of the spiral knitted wire mesh 7 with a vacuum nozzle, the mesh number of the wire mesh was reduced. A surface material 1 having the same number of openings 6 for liquid permeation as described above and corresponding to the surface shape of the spiral knitted wire mesh 7 was formed.

When a sanitary napkin was manufactured using the above-mentioned surface material 1, the sanitary napkin was superior in absorbency to that of a conventional sanitary napkin using a surface material and showed a dry feel (having a dry feeling). Despite the low mounting pressure, the fit was good following the movement of the wearer, and was pleasant without giving a sense of incongruity.

[0036]

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. In addition to the wearability that does not sometimes give a sense of discomfort and the shielding property that hides the color of the absorbed liquid so that it does not appear on the surface, it has various effects as described above.

Further, according to the method for producing a surface material of an absorbent article of the present invention, a surface material having the above-mentioned effects can be efficiently produced.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a surface material of an absorbent article according to the present invention, and FIG. 1A is a partially cutaway perspective view of an absorbent article provided with the surface material according to the present embodiment; FIG. 1B shows FIG.
FIG. 1C is an enlarged partial cross-sectional perspective view showing an enlarged shape of one hole of the surface material shown in FIG. 1 from one direction . FIG. 1C is a diagram showing each dimension of one hole of the surface material shown in FIG. 1B.

2 shows an embodiment of the surface material of the absorbent article according to the present invention, FIG. 2A is a partially enlarged plan view of the surface material according to the embodiment, and FIG. 2B is the surface material shown in FIG. Is a partially enlarged perspective view when viewed from the front side, and FIG. C is a partially enlarged perspective view when the surface material shown in FIG. A is viewed from the back side.

FIG. 3 shows an embodiment of the surface material of the absorbent article of the present invention, FIG. 3A is a partially enlarged plan view of a spiral knitted wire mesh for forming the surface material shown in FIGS. 2A to 2C, and FIG. It is the same part expansion perspective view.

4A to 4C show another embodiment of the surface material, FIG. 4A is a partially enlarged plan view of the surface material according to another embodiment, and FIG. 4B is a front view of the surface material shown in FIG. FIG. C is a partially enlarged perspective view when the surface material shown in FIG. A is viewed from the back side.

FIG. 5 is a partially enlarged plan view of a spiral knitted wire mesh for forming the surface material shown in FIGS. 4A to 4C, and FIG.
Is a partially enlarged perspective view of the same.

6A, 6B, 6C, 6D, and 6E are process explanatory views showing one embodiment of the method for producing a surface material of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 10 Surface material P hole part 2 Absorber 3, 30 Top part 4, 40 Bottom part 5, 50 Curved wall part 6, 60 Liquid permeation opening 7, 70 Surface material forming die 7a, 7b Wire rod 70a, 70b Wire rod 9 Surface material molding resin (molten resin)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-64-65565 (JP, A) JP-A-2-10826 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) A61F 13/15-13/84

Claims (6)

(57) [Claims] 1. A surface material made of a liquid-impermeable material for covering the surface of an absorbent body of an absorbent article provided with the absorbent body and having an infinite number of holes, wherein each of the surface materials is an upper surface of the surface material. Upward from
Innumerable tops each having a convex curved surface projecting therefrom, innumerable bottoms each including a concave curved surface, and a curved wall connecting the top and the bottom respectively.
A structure formed by the connected top, the curved wall, and the bottom, and having a space between the tops, wherein the maximum diameter between the curved walls in each hole is between the tops. Larger than the minimum diameter of the space,
A surface material for an absorbent article, characterized in that the bottom portion and / or the curved wall portion of each of the holes has a liquid permeation opening communicating with the space between the tops. 2. The surface material of an absorbent article according to claim 1, wherein said curved wall portion has a spirally twisted shape. 3. The surface material for an absorbent article according to claim 1, wherein a maximum diameter of the liquid-permeation opening is smaller than a minimum diameter of the space between the tops. . 4. A peripheral portion of the liquid permeation opening is the top portion,
Surface material of the absorbent article according to any one of claims 1 to 3, wherein the more flexible than the curved wall portion and the bottom portion. 5. The method for producing a surface material of an absorbent article according to claim 1, wherein the surface material molding resin is supplied to one surface of a surface material molding die made of a spirally knitted wire mesh. Vacuum suction is performed from the other surface of the material forming die, and the surface material forming resin is formed in a shape along the surface shape of the surface material forming die, and a hole is formed at a position corresponding to a space between the wires of the wire mesh. A method for producing a surface material of an absorbent article, characterized by forming into a sheet having the same. 6. The absorptive material according to claim 5, wherein the fluid is moved from one surface portion to the other surface portion of the surface material molding die and pressurized, and simultaneously, vacuum suction is performed from the other surface portion. A method for producing a surface material of an article.