JP2741821B2 - Surface material for absorbent article and method for producing 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 used for absorbent articles such as sanitary napkins and diapers.

[0002]

2. Description of the Related Art Generally, an absorbent article used for absorbing and retaining body fluid from the human body absorbs and retains a liquid between a liquid-permeable surface material and a liquid-impermeable leakproof material. It has a structure with an absorber interposed. In this absorbent article, a liquid-permeable surface material (sometimes referred to as an outer packaging material, a coating material, a top sheet, a cover stock, etc.)
Means that the liquid to be absorbed is promptly transferred to the absorber (hereinafter, referred to as “liquid permeability”), and that the liquid transferred to the absorber is not returned and gives the human body a dry feeling ( Hereinafter, it is demanded that the color of the body fluid diffused in the absorber is shielded (hereinafter, referred to as “shielding property”), and that the texture is good. . The main function of the liquid-impermeable leakproof material is to prevent the excrement absorbed and retained by the absorber from leaking out. However, it is strongly desired that the appearance and feel be cloth-like. It became as to be.

[0003] Various techniques have been proposed for this type of absorber. For example, by using a nonwoven fabric which is an aggregate of hydrophobic fine fibers as a surface material, and forming a space of a hydrophobic atmosphere between the body surface and the absorber, the liquid return preventing property without impairing the liquid permeability. There is a technique for improving the performance (Japanese Patent Application Laid-Open No. 58-180602). In this non-woven fabric, the unevenness pattern of the fine fibers on the surface and the minute space inevitably formed by the fine fiber aggregate,
It can give the user a soft and smooth feel.

However, in the technique using a nonwoven fabric as a surface material, the liquid to be transferred to the absorbent is easily retained in the minute space of the nonwoven fabric fibers, and when the pressure is applied, the retained liquid is easily transferred to the body surface side. Therefore, no matter how much hydrophobic fibers are used, there is a limit in improving the liquid return prevention. On the other hand, a technique for improving the liquid return prevention property by using a hydrophobic sheet having holes (apertured film sheet), specifically, a film having a hole as a surface material (Japanese Utility Model Application Laid-Open No. 54-124398, JP-A-57-1340 and JP-A-61-45753) have also been proposed. If this perforated film sheet is used as a surface material, no liquid is retained in the surface material. However, in films with apertures,
While often lacking in aesthetics, these films retain the "plastic" sensation inherent to films having heterocycles in the polymer, and give a feeling of tackiness or discomfort when in contact with the skin of the user. There are drawbacks. In particular, when a small amount of liquid remains on the film surface, the body temperature is increased, and further pressure is applied (by wearing), the discomfort of this "plastic" becomes remarkably large, and the feeling of stuffiness and stickiness is expressed. Then, skin troubles such as Kayumi and rash occur, and even cases that cannot be used appear.

In order to solve these drawbacks, a technique of forming a microscopic fine uneven pattern (referred to as micro-emboss treatment) on the film surface in contact with the body side to impart a cloth-like feel (Japanese Patent Laid-Open No. 58-1983) -1517 publication) has been proposed.

[0006]

However, simply providing irregularities of several tens of μm on a smooth film surface (usually referred to as “micro-embossing treatment”) is not enough.
Although the "plastic" feeling can be improved to some extent, the "plastic" feeling has not been sufficiently improved in mounting clothes due to the mounting pressure and the flexibility of the skin. Further, by performing micro-embossing treatment on the smooth opening film surface, there is a problem that the remaining stability of the liquid on the smooth surface is increased, and the remaining liquid is increased. Furthermore, in a normal micro-embossing process, a fine uneven pattern extends to the inside of a hole opened in a film (usually referred to as a “connection portion”).
There is also a problem that liquid permeability is inferior as a result of increased wall frictional resistance of the holes. As described above, in the conventional micro-embossing treatment, the above-mentioned problems work synergistically, and the discharged liquid is extremely likely to remain on the surface, which promotes stuffiness and stickiness, and discomfort of “plastic” And the adverse effects on the skin have not been improved.

[0007] Accordingly, an object of the present invention is to provide a surface material for an absorbent article which has a soft and comfortable feeling without a "plastic" feeling, has a small amount of liquid residue on the surface, and is unlikely to cause stuffiness and stickiness. Is to do.

[0008]

According to the present invention, as shown in FIG. 4, an absorbent article provided with an absorber is made of a liquid impermeable material covering the surface of the absorber and has an infinite number of holes. In the surface material made of a plastic film, the surface material is formed of a convex curved surface and countless tops that do not form a continuous plane, countless bottoms each formed of a concave curved surface, and the top and the bottom. Each of the holes has a structure formed by the connecting portion, the top portion and the bottom portion, and has a space between the top portions, and the surface material further includes: By forming an opening for liquid permeation communicating with the space between the tops at the bottom, a continuous macroscopic folded structure including the whole from the top to the bottom is formed as a whole, and It by providing a surface material for absorbent articles, characterized in that only the fine concavo-convex pattern in section is formed, it is obtained by achieving the above object.
The present invention further relates to a method for producing a surface material for an absorbent article according to claim 1, as a method for suitably producing the surface material for an absorbent article, wherein the extruder comprises Extrude the plastic molten resin to the surface side of the support,
In the sheet forming step of forming a sheet having countless tops corresponding to the stitches of the support, and in the sheet forming step, the extruded molten resin is suctioned from the back side of the support, and the liquid permeates through the sheet. A perforating step of perforating an opening for use, and the sheet perforated in the perforating step,
An embossing step of forming a fine uneven pattern only on the top of the sheet by embossing the surface of the support from the surface side thereof, and a method of manufacturing a surface material for an absorbent article, comprising: It is also provided.

The method for producing a surface material for an absorbent article according to the present invention includes the following three methods, including the method according to the present invention. That is, as a method of providing a fine uneven pattern only on the skin contact surface, a sheet is punched /
A method of producing a support used in molding by giving a substantial uneven pattern to the support (method 1). Another method is to apply a post-treatment to one surface of the produced support. A method (method 2) of providing a substantial uneven pattern on the support. One remaining method is a method for producing a surface material for an absorbent article according to the present invention, in which the sheet surface is embossed on a support immediately after the sheet is actually perforated (Method 3).

When the plastic sheet is perforated and used as a surface material, a resin for forming a surface material is supplied on one surface of a perforated plate for forming a surface material (hereinafter referred to as a “support”). A method is used in which vacuum suction is performed from the other surface of the support, and holes corresponding to the holes of the support are provided in the sheet. In general, the surface material obtained inherits the macroscopic structure of the surface of the support, and the surface in contact with the skin is flat. However, as this support,
For example, by using a spiral knit wire mesh,
It is possible to provide a surface material having a macroscopic folded structure as a whole, in which a hole corresponding to a space between wires of a wire mesh is formed and a curved shape of the surface of the wire mesh is formed as a surface shape.
Because the surface material has a macroscopic folded structure, the contact portion with the skin does not closely adhere in a plane, and approximately comes into a point-like (spot-like) contact, thereby largely avoiding a plastic touch. In addition, the surface persistence of the liquid can be greatly improved because, in principle, there is no flat portion where the liquid can remain on the surface.

That is, as shown in FIGS. 3 and 4, the surface material 1 has a myriad of tops 3 each having a convex curved surface and not forming a continuous plane, and an innumerable bottom 4 each having a concave curved surface. And a connecting portion 5 for connecting the top portion 3 and the bottom portion 4 respectively. The holes P are respectively formed by the connecting portion 5, the top portion 3 and the bottom portion 4 and each of the top portions 3 The structure has a space between them. Further, the surface material 1 is provided with a liquid permeation opening 6 communicating with the space between the tops 3 at the bottom 4 so that a continuous macroscopic view including the top 3 to the bottom 4 as a whole. A typical folded structure is formed, and a fine uneven pattern 2 is formed only on the top 3.
That is, the surface material 1 has a macroscopic fold structure and a fine uneven pattern 2 provided only on the top 3.

The use of such a characteristic support is
In particular, in carrying out the above-mentioned method 2 and the method 3 which is the manufacturing method of the present invention, it is not necessarily an essential technical element, but it becomes an inseparable technical element in carrying out the above-mentioned method 1. Hereinafter, in the method for producing a surface material for an absorbent article according to the present invention, the above-described methods 1 and 2 for imparting a fine concavo-convex pattern 2 to the top and the method 3 according to the present invention will be described in more detail.

In the above-mentioned method 1, as a support, FIG.
And (b) a spiral knitting or a normal knitting wire mesh 10, and the wire 11 used for the wire mesh 10 is a bundle of a plurality of finer wires (even if they are simply bundled, The wire may be a single wire, but the wire itself is subjected to a surface treatment in advance, and a microscopic (fine) concavo-convex pattern (for example, FIG. 2 (a), FIG. 2 (c))
It is a method of giving a.

The above method 2 is a method in which a microscopic (fine) concavo-convex pattern (for example, FIGS. 2A and 2C) is applied to one surface of the formed support by post-processing. is there. In this case, it is preferable to use the spirally woven wire mesh 10 as a support similar to the method 1 from the viewpoint of the feeling such as the reduction of the surface material contact area and the improvement of the flexibility, and it can be more suitably used. Basically, the same surface treatment can be applied to a normal perforated plate (support).

Regarding the provision of the fine concavo-convex pattern by the surface treatment in both of the above methods 1 and 2, any of the following methods or a combination of any of the following methods can be used. That is, the surface treatment is imparted by etching treatment, spraying of abrasive high-hardness particles (referred to as “sand blast”), or the like, or the application of a convex surface by spraying molten metal particles (referred to as “spraying”). Alternatively, there is a method of transferring a fine pattern formed in advance on the surface of a mold by pressing a mold (emboss roll or the like) having a higher hardness than the target. The above method 1 further includes a method of passing a wire at the time of wire production or passing the produced wire through a nozzle (mold) having a non-circular cross section with a low roundness, and further, scratching the surface with a hard surface or a mold. It can be used.

The above method 3, which is the production method of the present invention, is carried out as follows. That is, as shown in FIG.
As an extruder, a molten resin 41 is extruded from a T-die 40 onto a spirally knitted wire mesh 10 as a knitted support to form a sheet having countless tops corresponding to the mesh (sheet forming step). Next, the sheet (molten resin) on the wire mesh 10 is sucked from the back side of the wire mesh 10 by the suction device 42, and a liquid-permeable opening is formed in a portion corresponding to the mesh of the wire mesh 10 (piercing step). Then, a mold (typically embossed rolls, for example, embossed rolls, for example, having a flat plate-like shape such as a wire mesh having a large mesh) is formed on the surface of the obtained sheet from the skin contact surface side (surface side) in advance. (It is also possible to use a mold.) 43 is pressed, and the surface pattern is transferred and embossed to form a fine uneven pattern only on the top of the sheet (embossing step). It is preferable that the embossing roll 43 is not a hard metal roll but a rubber roll or the like having a flexible surface with irregularities so as to follow the spiral net. In order to enhance the transferability of the pattern in the embossing process, it is necessary to bring the embossing process as close as possible to the perforating process and complete the process while the resin constituting the sheet is in a temperature region having heat depopulation. If the resin is not softened after the perforation step, it is better to raise the resin temperature to a moldable temperature by reheating by the heater 44 after the perforation step, or to perform the embossing step by heating the embossing roll 43. By this method, it is possible to strictly eliminate the risk that the distortion of the support due to the pressurization in the embossing process affects the perforation process and affect the perforation property, and also performs post-heating such as blowing hot air from the contact surface side with a nozzle. According to the method, the porosity can be improved by the post-treatment.

In any of the above methods 1 and 2, a fine uneven pattern is provided only on the surface of the support, and the hole is formed by performing vacuum suction from the other surface of the support. At this time, the fine concavo-convex pattern is selectively transferred to a surface portion (a portion forming a beam, not a hole) of the surface material. At this time, in the hole which is not placed on the support, a fine uneven pattern is not formed, the wall friction resistance of the hole (inner) wall remains at a low level, the liquid permeability is not adversely affected, and the hole is not affected. Can be kept at a low level.

Further, in the above-mentioned method 3, which is the method of the present invention, it is easy to control the area where the fine concavo-convex pattern 2 is provided by appropriately controlling the transfer pressure. In particular, when a spiral knit wire mesh is used for the support and combined with a surface material having a macroscopic folded structure on the surface, a fine uneven pattern 2 is pinpointed at the top of the top of the surface material. As a result, the fine uneven pattern 2 exists only in the spot that comes into contact with the skin, and the fine uneven pattern does not exist in the hem portion that is difficult to come into contact with the skin even in the surface structure. Thus, a surface material with little liquid residue is formed.

Innumerable fine uneven patterns 2 to be formed
As shown in FIGS. 2 (a) and 2 (c), the distance (pitch) H between adjacent protrusions is approximately 20 to 150 μm,
More preferably, the height (depth of unevenness) T is 5 to 60 μm, and still more preferably 10 to 40 μm.
It needs to be in the range of μm. Pitch is 150μ
If it is larger than m, the skin will also contact the concave portion due to the flexibility of the human skin between the convex portion and the convex portion, and the "plastic" feeling will be felt, which is not preferable,
If the thickness is smaller than 20 μm, the interval between the projections is too small, and the same feeling as a continuous flat surface is obtained. The height is 5 μm
If it is lower, the area of contact with the skin is not sufficiently reduced, and a “plastic” feeling is felt.
The above is not preferable because the user recognizes the unevenness as an unfavorable texture such as roughness / bulk. Note that the pitch H and the height T are set in the same manner in FIGS. 2B and 2D.

In order to keep the texture away from the “plastic” tactile sensation, the concave / convex pattern has a pitch / height /
It is preferable that the pattern is irregularly distributed and the convex shape has a rounded mountain shape without an artificial tactile sensation due to the texture. On the other hand, in the method 1, a method in which the wire is formed into a bundle of fine wires, In the method of scratching and forming linear scratches, the surface structure of the sheet to be formed is very similar to the woven filament aggregate structure,
It can be suitably used similarly to the one in which fine irregularities of an irregular pattern are provided.

According to the above-mentioned method 3 of the present invention, by selectively applying a fine concavo-convex pattern to the topmost portion of the top portion, both the hand and the liquid retention are provided, and the most ideal surface structure is provided. Convex pattern region fine irregularities is given in this case is formed by a generally oval top, the region is preferably in the range of 0.002mm ² ~15mm ² respectively, further 0.006mm ^{2 ~6mm}
More preferably, it is in the range of ² . When the uneven pattern area becomes larger than 15 mm ² , although there is no particular problem in texture, the surface with many unevenness that easily causes liquid residue is unnecessarily large, resulting in a large amount of liquid remaining on the surface as a whole. When the uneven pattern area is less than 0.002 mm ² , when the wearing pressure during wearing is large (50 g / cm ² or more), the outer part of the area provided with the fine uneven pattern is exposed to the skin. This is because it is not preferable because a “plastic” feeling is generated upon contact. As described above, when the regions of the concavo-convex pattern 2 exist independently of each other and are separated from each other, the distance between the regions is preferably in the range of 50 μm to 500 μm in terms of the center-to-center distance, and is preferably 100 μm. More preferably, it is within a range of from 500 μm to 500 μm.

In the method of manufacturing the surface material 1 according to the present invention,
To obtain the surface material 1 easily and without losing flexibility,
A method in which a resin having a thermoplastic property is molded into a sheet in advance and heated to a plasticizing temperature and sent onto a wire mesh 10 of a spiral mesh as a support.
A typical method is to pierce the wire mesh 10 by pouring it out of the die 40 or the like in the form of a film. A laminated nonwoven fabric in which a hydrophobic film and a fiber aggregate are integrated is spirally knitted on a wire mesh 10 as a support. And a method of providing a fine uneven pattern according to method 3 may be used. There are a method of perforating with a needle, a method of utilizing a pressure difference of a fluid, and the like in order to open the processed product of the fine uneven pattern of the latter laminated nonwoven fabric. However, as long as the uneven pattern according to the present invention is not damaged. Any method may be used. The apertures P are provided uniformly over substantially the entire surface of the sheet, and the shape may be any of a circle, an ellipse, and a slit. The density of the apertures is generally 50 to 500 holes / cm ² , preferably 70 to 300 holes. / Cm ² .

The plastic sheet suitably used for the surface material 1 of the present invention is not particularly limited, but may be polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polyolefin, olefin and other vinyl monomers (vinyl acetate, acrylic Ethyl acid) and copolymer resin,
Hydrophobic resins such as polyesters, nylons, acetates and blended polymers thereof are preferred, and polyolefins, copolymerized resins of olefins with other monomers or blended polymers of these are preferred in view of the feeling.

When the surface material 1 of the present invention is used as a leakproof material for an absorbent article, it is preferable to use a laminated nonwoven fabric provided with a fine uneven pattern as it is. In this case, by appropriately controlling the suction force at the time of vacuum suction on the support, a plastic sheet having a recess at a position corresponding to the support hole (or a portion corresponding to the hole) is used. Can be. In terms of sheet flexibility, texture, and the like, the latter form in which fine irregularities and macroscopic depressions are mixed can be more preferably used. Further, in the usage form in which the surface material and the leakproof material are integrated to form the outer packaging material, the suction pressure is changed between a portion corresponding to the surface portion and a portion corresponding to the other portion (side surface and back surface). It is possible to produce both at the same time by completely opening the opening portion of the support and leaving the remaining portion in the recess without opening.

[0025]

The surface material for the absorbent article of the present invention has a large uneven curved surface structure and a fine uneven pattern selectively provided on the top portion which is the contact surface with the skin, so that it can be used at the time of use. The contact area with the skin can be reduced as much as possible, giving a slatted feeling without the conventional plastic feeling. Further, the surface material for an absorbent article of the present invention has a smooth surface as a surface sheet, and has no fine uneven pattern in the holes, so that the surface friction resistance is suppressed to a small value and the surface liquid residue after liquid absorption is small. Furthermore, the method for producing a surface material for an absorbent article of the present invention suitably produces the surface material for an absorbent article.

[0026]

EXAMPLES The present invention will be described below in more detail, but the present invention is not limited to these examples. In the following examples, a sanitary napkin surface material will be described as an example, but the present invention can be similarly used for a napkin leak-proof material, a back sheet, and other paper diapers.

(Preparation of Support) FIG. 1 shows a spirally knitted wire mesh used for manufacturing a surface material for an absorbent article of the present invention. FIG. 1A is an enlarged plan view of a wire mesh, and FIG.
FIG. 2 is an enlarged perspective view of the wire mesh shown in FIG. Although a perforated plate can be used for the support as described above, it is shown as a representative example having a surface-specific fold structure most characteristic in flexibility, hand, and liquid retention. In each of the examples described below, the knitting method shown in this figure is used as a basic pattern, and a fine uneven pattern is provided by performing the surface treatment described above. The method of knitting the wire mesh is not limited to the spiral knitting described herein, and any weaving method applied to wire mesh / woven fabric, such as plain weave and satin weave, can be used.

Support 1 A steel wire having a diameter of 0.35 mm was used as the wire 11 of the wire mesh 10 to form a spiral knitted wire mesh shown in FIG. 1 to obtain a support net having a width of 40 cm and a length of 10 m.

Support 2 A steel wire having a diameter of 0.35 mm was used as a wire material of the wire net 10, and fine quartz powder having an average particle diameter of 100 μm was sprayed on the wire to obtain an average surface depth of 50 μm and an average distance between protrusions. By giving a fine uneven pattern of 150 μm, FIG.
A wire 11a shown in FIG. 1A is prepared, and a wire mesh of spiral knitting shown in FIG.
A support net having a length of 10 m and a length of 10 cm was obtained.

Support 3 A steel wire having a diameter of 0.07 mm was used as a wire material of the wire netting 10, and the five wires were bundled to form a stranded wire.
A wire 11b shown in FIG. 1 (b) is prepared, and a wire mesh of spiral knitting shown in FIG.
m and a support net having a length of 10 m were obtained.

Support 4 A wire made of steel having a diameter of 0.35 mm was used as a wire material of the wire mesh 10 to form a spirally knitted wire mesh shown in FIG. The molten stainless steel is sprayed and fixed to the wire mesh, and a surface having an average height of 40 μm and a surface as shown in FIG.
Giving a fine uneven pattern with a pitch average of 100 μm,
A support net having a width of 40 cm and a length of 10 m was obtained.

Support 5 A steel wire having a diameter of 0.35 mm was used as a wire material of the wire mesh 10 to form a spiral knitted wire mesh shown in FIG. This wire mesh was sandwiched between two embossing rolls made of stainless steel to which a fine uneven pattern having a depth of 30 μm and a pitch of 150 μm had been previously formed. As a result, a support net having a width of 40 cm and a length of 10 m was obtained in which a fine uneven pattern was provided on both tops of the wire 11d of the wire net (FIG. 2D).

(Preparation of Surface Material) Example 1 A polyethylene resin (UZ-15100C, manufactured by Mitsui Petrochemical Industries, Ltd.) was extruded from a single screw extruder (VZ-32-T, manufactured by Sumitomo Heavy Industries, Ltd.). And the above-mentioned support 1
0 (using support 2 as support). The support 10 is formed into a belt shape in advance, and is sucked from below by a suction nozzle provided at a position where the extruded resin falls, and the molding and the opening are simultaneously performed. The obtained film was cooled while being conveyed together with the belt, and wound up to obtain a polyolefin film having a basis weight of 30 g / m ² (Example 1) as shown in FIG.

Example 2 A polyolefin film having a film basis weight of 30 g / m ² (Example 2) was obtained in the same manner as in Example 1, except that Support 3 was used as the support.

Example 3 A polyolefin film having a basis weight of 30 g / m ² (Example 3) was obtained in the same manner as in Example 1, except that the support 4 was used as the support.

Example 4 A polyolefin film having a basis weight of 30 g / m ² (Example 4) was obtained in the same manner as in Example 1, except that Support 5 was used as the support.

Example 5 A polyethylene resin (UZ-15100C, manufactured by Mitsui Petrochemical Industry Co., Ltd.) was extruded with a single screw extruder (VZ-32-T, manufactured by Sumitomo Heavy Industries, Ltd.), and the support was extruded. Pour on top. Immediately after the extruded resin was sucked from below by a suction nozzle provided at a dropping position and the film was formed and opened at the same time, the film was pressed against an embossing roll having a diameter of 50 mm provided on a support belt. The embossing roll is lined with a rubber in which inorganic fine particles are blended in advance, and is provided with a fine uneven pattern having a flexibility and an average depth of 25 μm and a pitch of 150 μm,
This is transferred to the top to obtain a basis weight of 3 as shown in FIG.
A polyolefin film of 0 g / m ² (Example 5) was obtained.

Example 6 Hot air of 120 ° C. was blown again from above with a wide-mouth nozzle without removing the film obtained in Example 2 from the support, and the film was suctioned from below.
The same embossing roll as used in the above was pressed. Thus, a polyolefin film having a basis weight of 30 g / m ² (Example 6) was obtained.

Example 7 The film obtained in Example 2 was removed from the support,
After being rolled, the sheet is unwound onto a normal conveyor belt, and hot air of 120 ° C. is again blown from above through a wide mouth and a nozzle. Then, the same steel embossing roll as used in Example 5 is synchronized with the conveyor belt. The surface (top) of the surface material was touched while being rotated at the desired angle. Thus, a polyolefin film having a basis weight of 30 g / m ² (Example 7) was obtained.

Comparative Example 1 A polyolefin film having a basis weight of 30 g / m ² (Comparative Example 1) was obtained in the same manner as in Example 1, except that Support 1 was used as the support.

Comparative Example 2 10 parts of polyethylene resin (UZ-15100C, manufactured by Mitsui Petrochemical Industries, Ltd.) and 10 parts of silica (Mizukazol C-1, manufactured by Mizusawa Chemical Industries, Ltd.) having an average particle size of 10 μm were used.
Shaft kneader (Laboplast mill, ME type, Toyo Seiki Co., Ltd.)
And kneaded into pellets. Two parts of the obtained pellets and 8 parts of the above polyethylene were mixed with a single screw extruder (VZ-32).
-T, manufactured by Sumitomo Heavy Industries, Ltd.), and extruded onto the support 1 and wound into a film to obtain a polyolefin film containing fine particles having a basis weight of 30 g / m ² (Comparative Example 2).

Comparative Example 3 A polyethylene resin (UZ-15100C, manufactured by Mitsui Petrochemical Industries, Ltd.) was placed on a conveyor belt by a single screw extruder (VZ-32-T, manufactured by Sumitomo Heavy Industries, Ltd.). It was developed into a film, and immediately afterwards, a steel embossing roll similar to that used in Example 5 was pressed from above, and the surface was roughly smooth except that it had a fine uneven pattern with a depth of 25 μm and a pitch of 150 μm. A film with an amount of 30 g / m ² was obtained. The polyolefin film having a fine uneven pattern even on the inner wall of the opening portion by installing the film on the support 1 and spraying hot air at 150 ° C. from the upper portion with a wide-mouth nozzle while transporting the film, and immediately suctioning the vacuum from the lower portion. (Comparative Example 3) was obtained.

(Evaluation method) Evaluation of High Viscous Liquid Remaining Using the films of Examples 1 to 7 and Comparative Examples 1 to 3, FIG.
Was constructed. That is, the absorbent holding sheet 22a is superimposed on the lower side of the absorber 22a to form the absorbent 22, and the absorbent holding sheet 22b is made of the absorbent papers 22c and 22c.
In this example, the absorbent polymer 22d sprayed between c is sandwiched. Next, the absorbent 22, the liquid-impermeable leak-proof sheet 23 laminated with polyethylene, and the surface material 1 of the present example were formed into an absorbent article shown in FIG. Sanitary napkin was made. In FIG. 5, reference numeral 27 denotes a double-sided tape, a tape, or the like, and the surface material 1 is detachably fixed to the absorber 22 and the leak-proof sheet 23 to obtain a sample 20.

Each absorbent article was attached to the extremely movable female waist model 30 shown in FIG. 6, and after putting on shorts, the subject was allowed to walk at a walking speed of 100 steps / minute (50 m / minute) for 10 minutes. 3 g of the defibrillated horse blood (high viscous liquid) whose kinematic viscosity was adjusted to 50,000 cp by adding sodium carboxymethylcellulose (manufactured by Wako Pure Chemical Industries, Ltd.) was injected while walking through the tube 31, and then the same speed was used. After walking for 3 minutes, 3 g of the same defibrillated horse blood (high viscous liquid) was injected from the tube 31 while walking, and after 10 minutes of lameness, the device was stopped, the sample 20 was taken out, and the liquid spread on the sample 20. Was measured as (vertical extension length) × (horizontal extension length). Thereafter, the surface material was removed from the sample, the weight thereof was measured, and the amount of liquid remaining on the surface material was silicified based on the weight of the first surface material measured in advance.
The same evaluation was repeated for each sample 20 by 15 points, and the average value was used as the liquid spreading area and liquid remaining amount.

2. Texture The created surface material was cut out to a size of 15 × 30 cm, and the texture was evaluated for the following items according to the following procedure. In each evaluation, 35 women actually touched each other, and the results of evaluation according to each procedure were averaged and expressed. 2-1. Sarat feeling (stickiness) Touching the cut sample with the tip of a finger, raising the palm on the surface material and immediately raising the hand to see the feeling of clinging together, is the most appropriate word to express the feeling obtained as a whole The following words were selected from the following five items and evaluated. 5: Surratting. 4: Slightly slatted. 3: Neutral. 2: Slightly sticky. 1: Sticky.

2-2. Overall Evaluation While touching the cut-out sample by hand as appropriate, the most appropriate words expressing the feeling obtained as a whole were selected from the following five items and evaluated. 5: I like it. 4: Somewhat like. 3: Neutral. 2: Somewhat dislike. 1: I hate it.

(Evaluation Results) The results of evaluation of each of these Examples and Comparative Examples based on the above-described evaluation methods are shown in Table 1 below.

[0048]

[Table 1]

As is clear from Table 1, the liquid spreading area of Examples 1 to 7 is 55 mm × 47.
mm to 60 mm x 50 mm, whereas Comparative Examples 1 to
The spread area of each of No. 3 is 66 mm × 55 mm, and the product of the present invention is smaller than the spread areas of any of Comparative Examples 1 to 3. The residual amount of the highly viscous liquid is 2.00 g in this embodiment.
On the other hand, in Comparative Examples 2 and 3, 2.3
In this example, the remaining amount of the high-viscosity liquid was 5 g and 2.19 g, and good values were obtained. On the other hand, Comparative Example 1 had a residual amount of the high-viscosity liquid of 1.79 g and seemed to be superior to the Examples at a glance, but the Sarat feeling and the overall evaluation were significantly inferior to 1 and 2. Therefore, Comparative Example 1 is inferior to Examples 1 to 7 when judged comprehensively in consideration of the feeling of sat and overall evaluation. In other words, the product of the present example is
The area where the fine uneven pattern is imparted is controlled with an excellent balance between the salat feeling and the soft feeling. As a result, the amount of liquid remaining on the surface material is suppressed, and the stickiness caused by the remaining liquid is released. . In other words, it means the realization of a surface material which has no "plastic" feeling, has less stuffiness and stickiness, has an excellent texture and is gentle on the skin.

[0050]

According to the surface material for an absorbent article of the present invention, the absorbent material has a soft and comfortable texture without a "plastic" feeling, has a small amount of liquid residue on the surface, and is less likely to cause stuffiness and stickiness. A surface material for a sexual article can be obtained. Further, according to the method for producing a surface material for an absorbent article of the present invention, the surface material of the above-described absorbent article can be suitably produced.

[Brief description of the drawings]

FIG. 1 (a) is an enlarged plan view of a spirally woven wire mesh used for manufacturing a surface material for an absorbent article of the present invention,
FIG. 1B is an enlarged perspective view of the wire mesh.

FIGS. 2 (a) to 2 (d) are enlarged views of a wire mesh whose surface is finely unevenly processed.

FIG. 3 is a plan view of the obtained film.

4 is an enlarged view of a surface material for an absorbent article of the present embodiment, FIG. 4 (a) is an enlarged perspective view, and FIG. 4 (b) is an enlarged perspective view showing a part of the cross section. It is.

FIG. 5 is a configuration diagram of a napkin used for evaluation.

FIG. 6 is a view showing a mounted state of a movable female waist and a napkin.

FIG. 7 is a view schematically showing a manufacturing process for manufacturing a surface material for an absorbent article.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Surface material for absorbent articles 2 Concavo-convex pattern 3 Top 4 Bottom 5 Connecting part 6 Opening

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-279160 (JP, A) JP-A-5-177696 (JP, A) JP-A-5-162192 (JP, A) 17126 (JP, U)

Claims (6)

(57) [Claims] 1. A surface material made of a liquid-impermeable material for covering the surface of the absorbent body of the absorbent article provided with the absorbent body and made of a plastic film having a myriad of pores, wherein each of the surface materials is convex. A myriad of tops formed of a curved surface and not forming a continuous plane, innumerable bottoms each formed of a concave curved surface, and a connecting portion for connecting the top and the bottom respectively, and each of the holes is A structure formed by the connection portion, the top portion, and the bottom portion, respectively, and having a space between the top portions. Further, the surface material includes a liquid permeation liquid communicating with the space between the top portions at the bottom portion. By forming the opening, a continuous macroscopic folded structure including the top to the bottom as a whole is formed, and a fine uneven pattern is formed only on the top. A surface material for an absorbent article, comprising: 2. The distance between adjacent protrusions of the fine concavo-convex pattern is 20 to 150 μm, and the height of the protrusions is 5 to 6
The surface material for an absorbent article according to claim 1, which is in a range of 0 µm. 3. The area where the fine concavo-convex pattern is provided is 0.002 mm ² to 0.002 mm ² in actual use.
The surface material for an absorbent article according to claim ² , which is in a range of 15 mm2. 4. An adjacent region provided with the fine concavo-convex pattern has a center-to-center distance of 5 in an actual use state.
The surface material for an absorbent article according to claim 2, which is in a range of 0 µm to 500 µm. 5. The surface material for an absorbent article according to claim 1, wherein said surface material comprises a laminate of a plastic film and a nonwoven fabric. 6. The method for producing a surface material for an absorbent article according to claim 1, wherein a plastic molten resin is extruded from an extruder to a surface side of the knitted support to form a support. In a sheet forming step of forming a sheet having countless tops corresponding to the stitches, in the sheet forming step, the extruded molten resin is sucked from the back side of the support, and a liquid-permeable opening is formed in the sheet. A perforating step of performing a perforating step; and an embossing step of forming a fine uneven pattern only on the top of the sheet by embossing the sheet perforated in the perforating step from the surface side on the support. A method for producing a surface material for an absorbent article, comprising: