JPH04364843A - Surface material of absorbing product and its manufacture - Google Patents

Abstract

PURPOSE:To provide a surface material of an absorbing product and the manufacture thereof which has a liquid return preventing property eliminating fear of making the liquid absorbed once return to the side of skin, a mounting property with no feeling of discrepancy in mounting and a shielding property of concealing the color of the liquid absorbed so as not to appear on the surface along with a liquid permeabil ity allowing free movement of the liquid. CONSTITUTION:In a surface material which comprises a liquid-impermeable material covering the surface of an absorbent of an absorbing product with the absorbent while having numerous hole parts, it includes numerous tops each comprising a convex curved surface, numerous bottom parts each comprising concave curved surface and curved surface-shaped wall parts connecting the tops and bottoms, respectively. Hole parts P are formed with the tops 3, wall parts and the bottoms 4 connected respectively while having a space between the tops 3. The maximum diameter of each hole part P between the wall parts 5 is larger than the minimum diameter of the space between the tops 3 and a hole for permeation of a liquid is formed on the bottoms 4 and/or the wall parts 5 at each hole P to make the spaces between the tops communicate therebetween.

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

[Prior Art] In general, absorbent articles such as sanitary napkins and diapers include an absorbent body that absorbs liquids such as blood and urine, a surface material that covers the surface of the absorbent body and is applied to the skin, and the absorbent body that absorbs liquids such as blood and urine. and a backing material that covers the backside of the container to prevent liquid leakage. It goes without saying that the surface material of the above-mentioned absorbent article is required to have liquid permeability so that liquids such as blood and urine can be quickly transferred to the above-mentioned absorbent body and absorbed by the absorbent body. There are demands for liquid return prevention properties that prevent the absorbed liquid from returning to the skin side, and shielding properties that block the color of blood, etc. that has diffused into the absorbent body.

[0003] Conventionally, in order to meet the above-mentioned demands, for example, a nonwoven fabric that is an aggregate of hydrophobic fine fibers has been used to impair liquid permeability by forming a space under a hydrophobic atmosphere between the skin and the absorbent material. A surface material that reduces liquid return from the absorbent body (see JP-A-58-18060) and a hydrophobic liquid-impermeable sheet with pores to reduce liquid return from the absorbent body. Surface material (Japanese Utility Model Publication No. 54-124398, Japanese Patent Publication No. 57-17081, Japanese Patent Application Publication No. 57-13
40, Japanese Unexamined Patent Publication No. 61-45753, etc.) have been proposed.

[0004] Furthermore, among the above-mentioned surface materials, as a further improvement of the latter surface material, a surface is provided with micro-embossments so that the base surface, which is a non-perforated portion, comes into close contact with the skin and does not cause discomfort. Materials have also been proposed.

[0005]

[Problems to be Solved by the Invention] However, with the above-mentioned former surface material, liquid tends to accumulate in the micro spaces in the fiber aggregate, and when pressure is applied, the accumulated liquid moves to the surface side (skin side). In addition to being tactilely unpleasant, such as being sticky, it also has the disadvantage of being visually unpleasant, such as being stained with blood.

[0006] In addition, the latter surface material mentioned above uses a hydrophobic film, and it is necessary to increase the aperture area in order to allow the liquid to move freely. There was a drawback that the liquid return prevention property was reduced. Furthermore, although the improved surface material of the latter mentioned above has some effect at the initial stage of installation (when dry), it has the drawback that once it gets wet with liquid, the effect of providing micro-emboss is hardly obtained.

Furthermore, even though all of the above-mentioned conventional surface materials are made of flexible materials, the shearing force in the direction along the surface of the surface material is large, giving a feeling of discomfort when worn. Therefore, it is an object of the present invention to have liquid permeability that allows liquid to move freely, prevent liquid from returning to the skin side once absorbed, and wearability that does not make you feel uncomfortable when wearing it. Another object of the present invention is to provide a surface material for an absorbent article that has a shielding property that hides the color of absorbed liquid from appearing on the surface, and a method for manufacturing the same.

[0008]

[Means for Solving the Problems] The present invention provides a surface material made of a liquid-impermeable material that covers the surface of the absorbent article of an absorbent article, wherein each of the surface materials has a convex curved surface. Each of the holes includes a plurality of top portions, a plurality of bottom portions each having a concave curved surface, and a curved wall portion that connects the top portions and the bottom portions. and the bottom part, and each has a space between the top parts, and the maximum diameter between the wall parts in each of the holes is larger than the minimum diameter of the space between the top parts, and each of the holes The above object is achieved by providing a surface material for an absorbent article, wherein the bottom and/or the wall of the absorbent article are each formed with apertures for liquid permeation that communicate with the space between the top parts. has been achieved.

The present invention also provides a preferable manufacturing method for producing the above-mentioned surface material, in which a resin for molding the surface material is supplied to one side of a mold for molding the surface material made of a spiral knitted wire mesh, and the surface material is molded. Apply vacuum suction from the other side of the mold,
An absorbent article characterized in that the resin for molding the surface material is molded into a sheet having holes in positions corresponding to the spaces between the wires of the wire mesh in a shape that follows the surface shape of the surface material mold. A method for manufacturing a surface material is provided.

0010

[Operation] 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 has numerous top portions each consisting of a convex curved surface, countless bottom portions each consisting of a concave curved surface, and the top portion. and a curved wall portion that connects the bottom portions, and each hole is formed by the top portion, the wall portion, and the bottom portion that are connected to each other, and has a space between the top portions. , the maximum diameter between the walls in each of the holes is larger than the minimum diameter of the space between the tops, and the bottom and/or wall of each hole has a space between the tops, respectively. Since liquid permeation holes are formed that communicate with ) When the liquid is pulled into the absorbent body, the liquid permeation openings are deformed to close, thereby preventing liquid from returning to the skin side once absorbed by the absorbent body. Even if body pressure is applied to the part, the wall part curves and relieves this stress, thereby preventing the space between the top parts and the liquid permeation opening from being blocked,
At the same time, it functions to guide the liquid from the space between the tops to the liquid permeation opening, and also has the shielding property that the curved wall part shields the liquid absorbed by the absorbent body during the deformation, and furthermore, the surface material The shearing force is small in any direction along the surface, and the top part has a good wearability that allows it to follow complex movements while in point contact with the skin, and a good texture that feels like cloth.

[0011]

【Example】

(Example of Surface Material) First, an example of the surface material of the absorbent article of the present invention will be described with reference to the drawings. Figures 1A to 3
A and B show an example of the surface material of the absorbent article of the present invention, FIG. 1A is a partially cutaway perspective view of the absorbent article equipped with the surface material according to the present example, and FIG. 1B is a , FIG. 1C is a diagram showing dimensions of a hole in the surface material shown in FIG. 1B, and FIG. 2A is an enlarged perspective view showing a hole in the surface material shown in FIG. A partially enlarged plan view of such a surface material,
Figure B is a partially enlarged perspective view of the surface material shown in Figure A viewed from the front side, Figure C is a partially enlarged perspective view of the surface material shown in Figure A viewed from the back side, and Figure 3A is the 2A to 2C are partially enlarged plan views of the spiral knitted wire mesh used to form the surface material, and FIG. 2B is a partially enlarged perspective view of the same portion.

[0012] The surface material 1 according to this embodiment is a surface material that is made of a liquid-impermeable material that covers the surface of the absorbent body 2 of an absorbent article equipped with the absorbent body 2, and has numerous pores P. (see FIG. 1), specifically, the molten resin is passed through a right-handed or left-handed co-directional spiral knitted wire mesh 7 (FIGS. 3A and 3B).
(see) and is formed into a sheet shape having holes at positions corresponding to the spaces between the wires of the spiral knitted wire mesh 7.

That is, as shown in FIGS. 2A and 2B, the surface material 1 has innumerable tops formed of convex curved surfaces shaped to follow the surface shape of the wire located at the top of the spiral knitted wire mesh 7. 3, numerous bottom parts 4 formed into a concave curved surface by falling into the spaces between the wire rods of the spiral knitted wire mesh 7, and formed into an inclined curved surface shape or a stepped curved surface shape in the process of falling between the wire rods of the spiral knitted wire mesh 7. , each having a curved wall portion 5 connecting the top portion 3 and the bottom portion 4, each hole P being formed by the top portion 3, the wall portion 5, and the bottom portion 4 connected to each other, and The structure has a space between the top parts 3, and the maximum diameter between the wall parts 5 in each hole P is larger than the minimum diameter of the space between the top parts 3, and the space in each hole P has a space between the walls 5. bottom 4 and/or
Alternatively, each of the wall portions 5 is formed with a liquid permeation opening that communicates with the space between the top portions 3. Further, in this embodiment, each of the holes P is surrounded by the four tops 3.

Furthermore, when manufacturing the surface material, the shape of the wall portion can be changed to the shape of the spiral knitted wire mesh 7 by appropriately selecting the viscosity of the resin when melted, the direction of vacuum suction, the resin composition, and the manufacturing conditions. "Spiral shape" corresponding to the shape of
It is also possible to form Furthermore, if the periphery of the liquid permeation hole 6 is made highly flexible, this part acts as if it were a valve, increasing the ability to introduce liquid to the absorbent body 2 and prevent the liquid from returning. .

Here, the liquid-impermeable material (hydrophobic sheet) constituting the surface material 1 includes polyolefins, copolymers of olefins and other vinyl monomers such as acrylic esters and vinyl acetate, polyesters, Examples include hydrophobic thermoplastic resin sheets such as polyamide, but among these, polyolefins, copolymers of olefins and other monomers, or polymer blend hydrophobic thermoplastic resin sheets are preferred from the viewpoint of texture and handling. preferable.

[0016] Furthermore, it is preferable that the liquid-impermeable material is opaque. Although the shape of the top portion 3, bottom portion 4, curved wall portion 5, etc. can block the color of liquids such as blood and urine absorbed into the absorber 2, the liquid-impermeable material itself is opaque. It is more preferable from the viewpoint of shielding properties. Various means can be considered to make the liquid-impermeable material itself opaque. For example, it is common to add white pigments such as titanium oxide and zinc oxide, and fillers such as calcium carbonate and clay alone or in combination during the molding process of the surface material 1.

Further, as shown in FIGS. 1B and 2B, the top portion 3 of the surface material 1 is rounded and has a convex curved shape that makes point contact with the skin and gives a soft and dry feeling. is preferred. Next, each preferable dimension of the surface material 1 of the present invention will be explained with reference to FIG. 1C.

The surface material 1 consists of a surface portion and an aperture portion for liquid permeation. The surface part is constituted by a top 3 projecting from the upper surface G, the thickness of which is designated L5. In addition, the liquid permeation hole portion is a portion extending downward from the top surface G to the bottom portion 4, and its thickness is the distance L6 from the top surface G to the liquid permeation hole 6 and the height difference L7 between the liquid permeation hole 6. sum L6 +L
It is expressed as 7. L6 +L7 is preferably larger than L5, more preferably twice or more.

[0019] The distance L2 between the top portions 3 is 0.05 mm.
It is preferable to set it in the range of ~5 mm, especially 0.2 mm.
It is more preferable to set it in the range of mm to 3 mm, and the minimum diameter L4 between the top parts 3 is preferably set in the range of 0.02 to 2.0 mm, particularly 0.1 to 1.0 m.
It is more preferable to set it within the range of m. The maximum diameter L3 between the wall portions 5 is preferably set within a range of 0.05 to 5.0 mm, particularly preferably set within a range of 0.2 to 3.0 mm.

[0020] Then, the maximum diameter L3 between the wall parts 5 is defined as the top part 3
By setting the diameter to be larger than the minimum diameter L4 between the absorbers, blood etc. absorbed by the absorber can be effectively shielded from visual observation. Further, the protrusion height L5 of the top portion 3 from the upper surface G of the surface material 1 is preferably set in the range of 0.02 to 2.0 mm, and particularly preferably set in the range of 0.1 to 1.0 mm. More preferred.

The distance L6 from the upper surface G of the surface material 1 to the liquid permeation opening 6 is preferably set in the range of 0.01 to 5.0 mm, particularly in the range of 0.1 to 2.0 mm. It is more preferable to do so. Height difference L of liquid permeation hole 6
7 is preferably set in the range of 0 to 2.0 mm, particularly preferably set in the range of 0.1 to 1.0 mm.

The diameter L8 of the liquid permeation hole 6 is 0.02
It is preferable to set it in the range of ~2.0 mm, especially 0
．． It is more preferable to set it in the range of 1 to 1.0 mm. By setting each dimension of the surface material 1 as described above,
It has excellent elasticity, allowing even substantially flexible materials to exhibit excellent elasticity. Also, the minimum diameter L between the tops 3
The angle α between the line connecting the center point x of the part 4 and the center point y of the liquid permeation hole 6 with the upper surface (horizontal surface) G of the surface material is 90
It is preferable to set it in the range of 30° to 30°, especially 60°.
It is more preferable to set the angle in the range of 45° to 45°.

Further, it is preferable that the liquid permeation opening 6 is shielded by 10% or more by the top portion 3 and the curved wall portion 5. In this way, not only the shielding property is improved, but also the liquid return Prevention is also improved. The aperture area of the liquid permeation aperture 6 is preferably 0.02 mm2 to 9 mm2. This is because if the opening area is smaller than 0.02 mm2, the liquid permeability will be poor, and if the opening area is larger than 9 mm2, the liquid return property will be poor. The aperture density of the liquid permeation apertures 6 is limited by the aperture area in view of liquid permeability and liquid backflow prevention property, but is 2/cm2 to 200/cm2.
It is preferable to That is, when the aperture area is small and the aperture density is low, the liquid permeability is substantially inferior, and as the aperture area becomes larger, the sheet forming property is inferior. It is preferable to set the number to 200 pieces/cm2.

A back material 8 (see FIG. 1) is disposed on the back surface of the absorbent body 2 to cover the back surface and prevent liquid leakage. Next, the action of the surface material 1 of this example will be explained. When an absorbent article provided with the above surface material 1 is worn, blood, urine, etc. are transferred from the surface material 1 to the absorbent body 2 and absorbed into the absorbent body 2. At this time, the surface material 1 has liquid permeability due to the liquid permeable apertures 6, and the top portion 3 deforms due to changes in the mounting pressure, increasing or decreasing the contact area with the skin, and the curved wall portion 5 Combined with the constricted shape, it has the function of promoting the transfer of blood, urine, etc. to the absorber 2 side, just as food is transferred by the peristaltic movement of the esophagus.

Furthermore, when a tensile force along the surface of the surface material 1 is applied, the surface material 1 deforms so as to close the liquid permeation holes 6, and when the above-mentioned tensile force is released, the liquid permeation holes 6 close.
It returns to its original shape as if it were opened. That is, only when a large force is applied when the absorbent article is worn (only when a force that returns the liquid once absorbed by the absorbent body 2 to the skin side is applied), the surface material 1 opens the liquid permeation opening. 6 is closed to reliably prevent liquid from returning from the absorbent body 2 to the skin side.

Furthermore, since the maximum diameter L3 of the curved wall portion 5 of the surface material 1 is larger than the minimum diameter L4 of the top portion 3, blood absorbed into the absorbent body 2 along with the top portion 3 is ,
It has the ability to reliably block the color of urine, etc. In addition, liquid permeation holes 6 are provided in the bottom portion 4 and/or the curved wall portion 5,
In addition, the maximum diameter L3 of the wall portion 5 is the minimum diameter L4 of the top portion 3.
Since the shearing force is smaller in any direction along the surface of the facing material 1, the facing material 1 can follow the wearer's complex movements while the top part 3 remains in point contact with the skin, thereby preventing wearer's slippage. It adheres closely to the skin without causing any discomfort, and does not cause any discomfort.

FIGS. 4A to 4C show other embodiments of the surface material 1 described above. The surface material 10 of the above-mentioned other embodiment is constructed by applying molten resin along the surface shape of a spiral knitted wire mesh 70 (see FIGS. 5A and 5B) in which spirals of right-handed and left-handed spirals are connected by rods. It is formed into a sheet shape and has holes at positions corresponding to the holes between the wires of the spiral knitted wire mesh 70, and similarly to the surface material 1, it has numerous top portions 30 each having a convex curved surface. , countless bottom portions 40 each having a concave curved surface, and the top portion 30.
and a curved wall portion 50 that connects the bottom portions 40, and each of the holes P is formed by the top portion 30, the wall portion 50, and the bottom portion 40 that are connected to each other, and the hole portion P is formed by the top portion 30, the wall portion 50, and the bottom portion 40 that are connected to each other. It is a structure with space in
The maximum diameter between the wall parts 50 in each of the holes P is larger than the minimum diameter of the space between the top parts 30, and each of the holes P
The bottom portion 40 and/or the wall portion 50 are provided with liquid permeation holes 6 that communicate with the space between the top portions 30, respectively.
0 is formed, and the same effect as the above-mentioned surface material 1 can be obtained. (Example of method for manufacturing surface material) Next, the above surface materials 1, 1
An example of a method for manufacturing 0 will be described with reference to the drawings.

FIGS. 6A to 6E are process explanatory diagrams showing one embodiment of the method for manufacturing the surface material of the present invention. In the manufacturing method of this embodiment, the surface materials 1 and 10 are manufactured by melt molding a thermoplastic resin, and the spiral knitted wire mesh 7 shown in FIGS. 3A and 3B, or the spiral knitted wire mesh 7 shown in FIG. A spiral knitted wire mesh 70 shown in B is used.

The material of the spiral knitted wire meshes 7 and 70 is preferably metal, since toughness and cooling properties for solidifying the molten resin are required. When metal is used as the material for the spiral knitted wire meshes 7 and 70, it is preferable to coat it with a resin from the viewpoint of corrosion resistance, mold releasability, etc. In addition to the spiral knitted wire meshes 7 and 70, there may be mentioned spiral knitted wire meshes using a plurality of twisted wires, spiral knitted wire meshes with irregularities, spiral knitted wire meshes in which wires of different thicknesses are combined, and the like.

According to the manufacturing method of this embodiment, the sheet-shaped molten resin 9 (see FIG. 6A) as the resin for molding the surface material is
For example, the sheet-shaped molten resin 9 is supplied from the upper part of the spiral knitted wire mesh 7 and vacuum-suctioned from the lower part of the spiral knitted wire mesh 7, so that the sheet-like molten resin 9 is distributed along the surfaces of the wire rods 7a and 7b of the spiral knitted wire mesh 7. It is poured, cooled and solidified by the wires 7a and 7b, and formed into a shape that follows the surface shape of the spiral knitted wire mesh 7 and has holes at positions corresponding to the spaces between the wires of the spiral knitted wire mesh 7. That's how I do it.

To explain this in detail, as shown in FIG. 6A, a sheet-shaped molten resin 9 is supplied from the upper part of the spiral knitted wire mesh 7 from a T-die (not shown), while a vacuum is supplied from the lower part of the spiral knitted wire mesh 7. When suctioning, first B
As shown in Figure C, the sheet-shaped molten resin 9 contacts the wire rod 7a at the top of the spiral knitted wire mesh 7 and is cooled and solidified. As shown in Figure D, the sheet-shaped molten resin 9 is deformed by the vacuum suction force, contacts the lower wire rod 7b, cools and solidifies, and then does not come into contact with the lower wire rod 7b. Then, it is deformed into a concave shape and solidified by air cooling, and a part of it is expanded and torn as shown in FIG. In this molding process, as the sheet-like molten resin 9 moves into the spiral knitted wire mesh 7 by the vacuum suction force, the maximum diameter L3 of the wall portion 5 becomes larger than the minimum diameter L4 of the top portion 3, and In this example, it will be twisted in a spiral shape, so
The bottom portion 4 and the curved wall portion 5 are formed even in the portion that is shielded from directly above, and the liquid permeation opening 6 is formed in this portion. As a result, the surface material 1 as shown in FIGS. 2A to 2C
is molded, and the surface material 1 is released from the spiral knitted wire mesh 7 using a compressed air flow from the same side as the vacuum suction side.

[0032] By using the spiral knitted wire mesh 70 as shown in Figs. 5A and 5B, it is possible to form the surface material 10 in the shapes shown in Figs. 4A to 4C. Furthermore, a film may be used as the resin for molding the surface material instead of the molten resin 9 supplied from the T-die. In this case, the spiral knitted wire mesh 7 is heated in advance to soften the film.
Alternatively, after being supplied to the spiral knitted wire mesh 7, the film is heated and softened. (Other examples of surface material and method for manufacturing the same) Above surface material 1
, 10, the case where the surface material of the present invention was formed using spiral knitted wire meshes 7 and 70 was shown, but the surface material of the present invention is not limited to this. Each of the holes P is connected to the top portion 3,
The structure is formed by the wall portion 5 and the bottom portion 4, and has a space between the top portions 3, and each hole P.
The maximum diameter between the wall portions 5 is larger than the minimum diameter of the space between the top portions 3, and the bottom portion 4 and/or the wall portion 5 of each hole P has a space between the top portions 3. It is sufficient that a liquid permeation hole communicating with the space is formed.
There are no particular limitations on the manufacturing method.

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

As the spiral knitted wire mesh 7, the wire diameter is 0.3
Using a 26-mesh wire mesh (SP-26-0.3 manufactured by Kansai Wire Mesh Co., Ltd.) consisting of spirals in the same direction of mm,
Further, as the sheet-shaped molten resin 9, an LD-PE molten resin containing 5% of TiO2 was used. The sheet-like molten resin 9 was supplied from the T-die onto the spiral knitted wire mesh 7 at a concentration of 25 g/m2, and when vacuum suction was performed from the lower part of the spiral knitted wire mesh 7 using a vacuum nozzle, the mesh number of the wire mesh was Surface material 1 having the same number of liquid permeation holes 6 and corresponding to the surface shape of the spiral knitted wire mesh 7
was formed.

When a sanitary napkin was manufactured using the above surface material 1, it exhibited superior absorbency and a dry feel (feeling dry) compared to sanitary napkins using conventional surface materials. Despite the weak wearing pressure, it followed the wearer's movements, provided a good fit, and was comfortable without causing any discomfort.

[0036]

Effects of the Invention The surface material of the absorbent article of the present invention not only has liquid permeability that allows liquid to move freely, but also has liquid return prevention properties that prevent liquid from returning to the skin side once absorbed, and is easy to wear. In addition to being easy to wear without making people feel uncomfortable and having shielding properties that hide the color of the absorbed liquid from appearing on the surface, it also has the various effects mentioned above.

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

[Brief explanation of the drawing]

FIG. 1 shows an example of the surface material of an absorbent article according to the present invention, and FIG. 1A is a partially cutaway perspective view of an absorbent article equipped with the surface material according to the present example. Figure 1B is Figure 1
FIG. 1C is an enlarged partial cross-sectional perspective view showing a hole in the surface material shown in FIG. 1B. FIG. 1C is a diagram showing dimensions of a hole in the surface material shown in FIG. 1B.

FIG. 2 shows an example of the surface material of the absorbent article of the present invention, FIG. 2A is a partially enlarged plan view of the surface material according to this embodiment, and FIG. 2B is a surface material shown in FIG. Figure C is a partially enlarged perspective view of the surface material shown in Figure A 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 used to form the surface material shown in FIGS. 2A to C, and FIG. It is an enlarged perspective view of the same part.

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

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

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

[Explanation of symbols]

1, 10 Surface material P Hole 2 Absorber 3, 30 top 4, 40 bottom 5, 50 Curved wall part 6, 60 Liquid permeation hole 7, 70 Surface material molding mold 7a, 7b Wire rod 70a, 70b wire rod 9 Resin for surface material molding (molten resin)

Claims (6)

[Claims] Claim 1. A surface material made of a liquid-impermeable material and having countless pores covering the surface of the absorbent article of an absorbent article, wherein each of the surface materials has a convex curved surface. The holes include countless tops, countless bottoms each having a concave curved surface, and a curved wall that connects the top and bottom, and each of the holes has a plurality of connected tops, walls, and a wall. The structure is formed by the bottom part and has a space between the top parts, and the maximum diameter between the wall parts in each of the holes is larger than the minimum diameter of the space between the top parts, and in each of the holes, A surface material for an absorbent article, wherein the bottom portion and/or the wall portion are each formed with a liquid permeation opening that communicates with the space between the top portions. 2. The surface material for an absorbent article according to claim 1, wherein the curved wall portion has a spirally twisted shape. 3. The surface material of the absorbent article according to claim 1, wherein the maximum diameter of the liquid permeation opening is smaller than the minimum diameter of the space between the top parts. . 4. The surface material of the absorbent article according to claim 1, wherein a peripheral portion of the liquid permeation opening has higher flexibility than the top, wall and bottom portions. . 5. A method for manufacturing a surface material for an absorbent article according to claim 1, comprising: supplying a surface material molding resin to one side of a surface material molding mold made of a spiral knitted wire mesh;
Vacuum suction is applied from the other side of the surface material mold, and holes are formed in the surface material molding resin at positions corresponding to the spaces between the wires of the wire mesh in a shape that follows the surface shape of the surface material mold. 1. A method for producing a surface material for an absorbent article, the method comprising forming a surface material into a sheet having a thickness of 1. 6. The absorbent material according to claim 5, wherein the fluid is moved from one side of the mold for molding the surface material to the other side to apply pressure, and at the same time vacuum suction is performed from the other side. A method for producing a surface material for an article.