JPH0670955A - Face material for absorptive article and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide a face material which has not a plastic feel, has a soft and comfortable feel and is less in retaining liquid on the surface thereof so as to be less sweaty and sticky. CONSTITUTION:A face material 1 for an absorptive article is formed thereon with innumerable crests 3 having convex curved surface shapes so as not to have continuous flat surfaces, innumerable troughs 4 having concave curved surfaces and connecting parts 5 respectively connecting the crests 3 and troughs 4, and hole parts P are formed by the connecting parts 5, the crests 3 and the troughs 4, each of the crests 3 having a space. Liquid permeating holes 6 are formed in the face material 1 so that troughs 4 are communicated with the spaces of the crests 3, respectively. With this arrangement, a continuous macroscopic foldable curved structure including the crests 3 and troughs 4 is provided, and further, fine concavities and convexities are formed on the crests 3. That is, the face material has macroscopic foldable curved structure and a fine concave and convex pattern formed only in the crests 3.

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 a human body absorbs and retains a liquid between a liquid-permeable surface material and a liquid-impermeable leak preventer. 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 covering material, a top sheet, a cover stock, etc.)
Is to transfer the liquid to be absorbed to the absorber promptly (hereinafter referred to as "liquid permeability"), and also to give the human body a dry feeling without returning the liquid transferred to the absorber ( Hereinafter, it is required to be referred to as “liquid reversion prevention property”, to shield the color of body fluid diffused in the absorber (hereinafter referred to as “shielding property”), and to have a good texture. . Further, the liquid-impermeable leak-proof material has a main function of preventing the excrement absorbed and held by the absorbent from leaking out, and further, it is strongly desired that the appearance and feel are cloth-like. It became as to be.

Various techniques have been conventionally proposed for this type of absorber. For example, by using a non-woven fabric, which is a hydrophobic fine fiber aggregate, as the surface material, and forming a space of a hydrophobic atmosphere between the body surface and the absorber, the liquid return prevention property is maintained without impairing the liquid permeability. Techniques for improving (Japanese Patent Laid-Open No. 58-180602) are mentioned. In this non-woven fabric, due to the concavo-convex pattern of the fine fibers on the surface and the fine space necessarily formed by the fine fiber aggregate,
It can give the user a soft and smooth feel.

However, in the technique using a non-woven fabric as the surface material, the liquid to be transferred to the absorbent is easily retained in the minute spaces of the non-woven fabric fibers, and when the pressure is applied, the retained liquid is easily transferred to the body surface side. However, even if hydrophobic fibers are used, there is a limit in improving the liquid return prevention property. On the other hand, a technique for improving the liquid return prevention property by using a hydrophobic sheet having apertures (a perforated film sheet), specifically an apertured film as a surface material (Japanese Utility Model Publication No. 54-124398). JP-A-57-1340 and JP-A-61-45753) have also been proposed. If this perforated film sheet is used as the surface material, the retention of the liquid in the surface material does not occur. However, in a film with apertures,
In addition to being often unaesthetic, these films retain the "plastic" feel typical of films with heterocycles in the polymer, which can cause stickiness or discomfort when in contact with the user's skin. There are drawbacks. Especially when a small amount of liquid remains on the surface of the film, body temperature is applied, and pressure is added (due to wearing), the discomfort of this "plastic" becomes extremely large, and stuffiness and stickiness appear, which is extremely severe. Then, skin troubles such as itching and rash occur, and even cases that cannot be used appear.

In order to solve these drawbacks, a technique for imparting a cloth-like feel by forming a microscopic fine concavo-convex pattern (referred to as micro-embossing treatment) on the film surface which is in contact with the body side (Japanese Patent Laid-Open No. 58-58). -1517 gazette) is proposed.

[0006]

However, if the surface of a smooth film is provided with irregularities of about several tens of μm (usually called “microembossing”),
Although it is possible to improve the "plastic" feel to some extent, the mounting feel and the flexibility of the skin have not been sufficient to improve the "plastic" feel. Further, there is a problem in that the micro-embossing treatment on the surface of a smooth apertured film increases the remaining stability of the liquid on the smooth surface and increases the liquid residue. Furthermore, in the usual micro-embossing process, since a fine uneven pattern extends to the inside of the holes opened in the film (usually referred to as “connecting part”),
There is also a problem that the liquid permeability is poor as a result of the increase in the wall frictional resistance of the holes. As described above, in the conventional micro-embossing treatment, the above-mentioned problems act synergistically, and the discharged liquid is very likely to remain on the surface, which promotes stuffiness and stickiness, and makes the "plastic" discomfort. And the adverse effects on the skin have not been improved.

Therefore, an object of the present invention is to provide a surface material for absorbent articles which has a "plastic" feeling, has a soft and comfortable texture, has a small amount of liquid remaining on the surface, and is resistant to stuffiness and stickiness. To do.

[0008]

According to the present invention, as shown in FIG. 4, an absorbent article having an absorbent body is made of a liquid impermeable material covering the surface of the absorbent body and has a number of holes. In the surface material made of a plastic film, the surface material, innumerable tops each consisting of a convex curved surface and not forming a continuous flat surface, innumerable bottoms each consisting of a concave curved surface, the top and the bottom. Each of the hole portions is 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 comprises: By forming a liquid permeation opening in each of the bottom portions that communicates with the space between the top portions, a continuous macroscopic fold structure that includes the top portion to the bottom portion as a whole is formed, 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 provides a method for producing the surface material 1 for an absorbent article as described above, which is a method for producing a surface material for an absorbent article according to claim 1, wherein a knitted shape is obtained from an extruder. Extruding plastic molten resin to the surface side of the support,
In the sheet forming step of forming a sheet having innumerable tops corresponding to the stitches of the support, in the sheet forming step, the extruded molten resin is sucked from the back surface side of the support to permeate the sheet. A perforating step of perforating the opening for, and the sheet perforated in the perforating step,
By embossing from the surface side on the support, an embossing step of forming a fine concavo-convex pattern only on the top of the sheet, and a method for producing a surface material for an absorbent article, comprising: It is also provided.

The method of manufacturing the surface material for absorbent articles according to the present invention is roughly classified into the following three methods including the method according to the present invention. That is, as a method of imparting a fine concavo-convex pattern only to the skin contact surface, the sheet is perforated /
During the production of the support used for molding, a method of producing by giving a substantial uneven pattern to the support (method 1), the other is one surface of the prepared support by post-treatment. A method (method 2) of providing a substantially uneven pattern on the support. The remaining one method is a method for producing a surface material for absorbent articles according to the present invention, which is a method (embodiment 3) in which the surface of a sheet is embossed on a support immediately after the sheet is actually perforated.

When the above plastic sheet is perforated and used as a surface material, a resin for surface material formation is usually supplied onto one surface of a perforated plate (hereinafter referred to as "support") for surface material formation, A method is used in which vacuum suction is performed from the other surface of the support to provide the sheet with holes corresponding to the holes of the support. Generally, the obtained surface material inherits the macroscopic structure of the surface of this support, and the contact surface with the skin is a flat surface. However, as this support,
For example, by using a wire mesh of spiral knitting,
It is possible to provide a surface material having a macroscopic fold structure as a whole, in which a position corresponding to a space between wire rods of the wire netting is a hole portion and a curved surface shape of the wire netting is a surface shape.
Because of its macroscopic fold structure, the surface material does not have a flat contact with the skin in a planar manner, and approximately a point-like (spot-like) contact, so the plastic feel is largely avoided. In addition, as for the surface persistence of the liquid, in principle, there is no flat portion where the liquid can remain on the surface, so it is possible to greatly improve this.

That is, as shown in FIGS. 3 and 4, the surface material 1 has an infinite number of tops 3 each having a convex curved surface and not forming a continuous flat surface, and an infinite number of bottoms 4 each having a concave curved surface. And a connecting portion 5 that connects the top portion 3 and the bottom portion 4 respectively, and each of the holes P is formed by the connecting portion 5, the top portion 3 and the bottom portion 4, and each of the top portion 3 is formed. It is a structure with a space in between. Further, the surface material 1 is formed with a liquid permeation hole 6 in the bottom portion 4 which communicates with the space between the top portions 3, so that a continuous macroscopic view including the top portion 3 to the bottom portion 4 as a whole. A fold-like structure is formed, and the fine concavo-convex pattern 2 is formed only on the top portion 3.
That is, the surface material 1 has a macroscopic fold structure and the fine concavo-convex pattern 2 provided only on the top portion 3.

The use of such a characteristic support is
In particular, in carrying out Method 2 described above and Method 3 which is the manufacturing method of the present invention, it is not necessarily an essential technical element, but it is an indispensable technical element in carrying out Method 1 described above. Hereinafter, in the method for producing a surface material for absorbent articles of the present invention, the above-mentioned methods 1 and 2 for providing the fine uneven pattern 2 on the top and the method 3 of the present invention will be described in more detail.

The above method 1 is used as a support as shown in FIG.
And, as shown in (b), a wire mesh 10 of spiral knitting or a normal weaving method is used, and the wire rod 11 used for this wire net 10 is a bundle of finer plural wire rods (even if they are simply bundled, May be twisted to form a twisted wire), or the wire itself is a single wire, but the wire is surface-treated in advance and a microscopic (fine) uneven pattern is formed on the surface (for example, 2 (a), FIG. 2 (c))
Is a method of giving.

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

Both the above methods 1 and 2 can use any of the following methods or a combination of any of the following methods for imparting a fine uneven pattern by surface treatment. That is, a surface defect is imparted by etching treatment, spraying of high hardness particles having abrasiveness (referred to as “sandblast”), or a convex surface imparted by spraying of molten metal particles (referred to as “spraying”), Alternatively, there is a method of transferring a fine pattern previously formed on the surface of the mold by pressing a mold (embossing roll or the like) having a hardness higher than the target. Regarding the above method 1, further, at the time of producing the wire rod, or passing the created wire rod through a nozzle (die) having an irregular cross section with low circularity, and further, a method of scratching the surface or die of high hardness It can be used.

The above method 3, which is the manufacturing method of the present invention, is carried out as follows. That is, as shown in FIG. 7, first,
Molten resin 41 is extruded from a T-die 40 as an extruder onto a wire mesh 10 of spiral knitting as a mesh-shaped support to form a sheet having innumerable tops corresponding to the mesh (sheet forming step). Next, the sheet (molten resin) on the wire net 10 is sucked from the back surface side of the wire net 10 by the suction device 42, and a liquid permeation opening is punched in a portion corresponding to the mesh of the wire net 10 (punching step). After that, a mold (typically an embossing roll, in which a fine concavo-convex pattern shape is provided on the surface in advance from the skin contact surface side (front surface side) of the obtained sheet, for example, a flat plate-like metal mesh with a large mesh By pressing 43), which is also possible with a mold, this surface pattern is transferred and embossed to form a fine concavo-convex pattern only on the top of the sheet (embossing step). The embossing roll 43 is preferably a rubber roll or the like having a flexible surface so as to have irregularities so that it can follow the spiral net rather than pressing a hard metal roll. 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 forming the sheet is in the temperature range having thermal depopulation. If the resin has not softened after the perforation step, it is better to reheat with the heater 44 after the perforation step to raise the resin temperature to a moldable temperature or heat the embossing roll 43 to perform the embossing step. 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 spreads to the perforation process and affects the perforation property.In addition, after heating, hot air is blown from the contact surface side with a nozzle. Depending on the method, it is possible to improve the openness by post-treatment.

Whichever of the above methods 1 and 2 is used, a fine concavo-convex pattern is provided only on the surface portion of the support, and as a result, vacuum suction is performed from the other surface of the support to perform punching and molding. At this time, this fine concavo-convex pattern is selectively transferred to the surface portion of the surface material (portion forming the beam, not the hole portion). At this time, the hole portion not placed on the support does not have a fine concavo-convex pattern, the wall surface frictional resistance of the hole (inner) wall remains at a low level, does not adversely affect the liquid permeability, and It is also possible to suppress the amount of liquid remaining in the tank to a low level.

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

Countless minute uneven patterns 2 to be formed
2A and 2C, the distance (pitch) H between adjacent protrusions is approximately 20 to 150 μm,
More preferably, it is 50 to 100 μm, and the height (depth of unevenness) T is 5 to 60 μm, further preferably 10 to 40.
It must be in the μm range. Pitch is 150μ
If it is larger than m, the skin comes into contact with the concave portion due to the flexibility of human skin between the convex portions, which is not preferable because a “plastic” feeling is felt.
This is because if it is less than 20 μm, the interval between the convex portions is too narrow and the feel is similar to that of a continuous flat surface, and a “plastic” feeling is felt, which is not preferable. Also, the height is 5 μm
If it is lower than 60 μm, the contact area with the skin will not be sufficiently reduced and you will feel a “plastic” feeling.
The above is not preferable because the user recognizes the unevenness feeling as an unfavorable texture such as roughness / bulkness. The pitch H and the height T are set similarly in FIGS. 2B and 2D.

In order to keep the texture away from the "plastic" feel, the uneven pattern has a pitch / height /
It is preferable that the patterns are irregularly distributed and the convex shape is a round mountain shape because it has no artificial feeling due to the texture, but on the other hand, in the method 1, a method in which the wire material is a bundle of thin wires or In the scratched and linear scratched method, the surface structure of the sheet to be formed is very similar to the woven filament aggregate structure,
It can be suitably used in the same manner as the one with irregular fine patterns having fine irregularities.

According to the above-mentioned method 3 of the present invention, selectively providing a fine uneven pattern on the topmost portion of the top portion makes the texture and the liquid remaining property compatible with each other and provides the most ideal surface structure. 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 ~ ⁶ mm
More preferably, it is in the range of ² . When the uneven pattern area becomes larger than 15 mm ² , there is no particular problem in terms of texture, but a 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 wearing pressure when wearing is large (50 g / cm ² or more), if the uneven pattern area is less than 0.002 mm ^2, the area up to the outside of the area with the fine uneven pattern will contact the skin. The reason is that it is not preferable because it causes a “plastic” feeling upon contact. As described above, when the areas of the concavo-convex pattern 2 exist independently and the areas are separated from each other, it is preferable that the areas have a center-to-center distance of 50 μm to 500 μm, and 100 μm. More preferably, it is in the range of ˜500 μm.

In the method for manufacturing the surface material 1 of the present invention,
To obtain the surface material 1 easily and without losing flexibility,
A method in which a sheet of thermoplastic resin is molded in advance and heated to a plastic temperature and sent onto the wire net 10 of a spiral net as a support, and a method in which these resins are melted
A typical method is pouring out into a film form on the wire netting 10 with a die 40 or the like, and a laminated non-woven fabric in which a hydrophobic film and a fiber assembly are integrated is used as a support. Alternatively, a method of applying a fine concavo-convex pattern according to Method 3 may be used. To open the processed product of the fine uneven pattern of the laminated nonwoven fabric of the latter, there are a method of punching with a needle, a method of utilizing a pressure difference of fluid, etc., as long as the uneven pattern according to the present invention is not damaged. However, any method may be used. The openings P are provided uniformly over almost the entire surface of the sheet, and the shape may be any of a circle, an ellipse, and a slit, and the density of the openings is generally 50 to 500 pieces / cm ² , preferably 70 to 300 pieces. / Cm ² .

The plastic sheet preferably used for the surface material 1 of the present invention is not particularly limited, but polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polyolefin, olefin and other vinyl monomers (vinyl acetate, acryl) are used. Ethyl ester) and copolymer resin,
Hydrophobic resins such as polyester, nylon, acetate and blend polymers thereof are preferable, and in consideration of texture, polyolefin, copolymer resin of olefin and other monomer or blend polymers thereof are preferable.

When the surface material 1 of the present invention is used as a leak preventer for absorbent articles, it is preferable to use a laminated nonwoven fabric having a fine uneven pattern as it is. In this case, by appropriately controlling the suction force when performing vacuum suction on the support, use a plastic sheet having a recess at a position corresponding to the support hole (or a portion corresponding to the hole). You can In terms of the flexibility and texture of the sheet, the latter form in which fine irregularities and macroscopic depressions are mixed can be more preferably used. In addition, in the usage mode in which the surface material and the leak preventer are integrated to form the outer packaging material, the suction pressure is changed between the part corresponding to the surface part and the part corresponding to the other part (side surface and back surface), and the surface material part is different. It is possible to produce both of them at once by completely opening the opening of the support and leaving it in the recess without opening the other parts.

[0025]

The surface material for absorbent articles of the present invention has a large concave-convex curved surface structure and a fine concave-convex pattern selectively applied to the apex to be the contact surface with the skin, The contact area with the skin in the skin can be reduced as much as possible, and it gives a smooth touch without the conventional plastic feeling. Further, the surface material for absorbent articles of the present invention has no smooth surface as a surface sheet and has no fine concavo-convex pattern in the pores, so that the surface friction resistance is suppressed to be small and the surface liquid remaining after liquid absorption is small. Furthermore, the method for producing a surface material for an absorbent article of the present invention preferably produces the surface material for an absorbent article described above.

[0026]

The present invention will be described in more detail below, 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 preventive material, a backsheet other paper diaper and the like.

(Preparation of Support) FIG. 1 shows a wire mesh of spiral knitting used for manufacturing a surface material for an absorbent article of the present invention. FIG. 1A is an enlarged plan view of the 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 as the support as described above, it is shown as a typical example having a surface-specific fold structure, which is the most characteristic of flexibility, texture, and liquid retention. In each of the examples described below, the basic pattern is the knitting method shown in this figure, and the fine surface 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 here, and any weave method applied to the wire mesh / woven fabric such as plain weave and satin weave can be used.

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

Support 2 A wire made of steel having a diameter of 0.35 mm is used as a wire material of the wire net 10. Fine particles of quartz having an average particle size of 100 μm are sprayed on the wire to obtain an average surface depth of 50 μm and an average convex distance. As shown in FIG.
The wire 11a shown in (a) is prepared, and the wire mesh of spiral knitting shown in FIG.
A support net having a length of cm and a length of 10 m was obtained.

Support 3 A wire made of steel having a diameter of 0.07 mm is used as a wire material for the wire net 10. Five wires are bundled into a stranded wire,
A wire 11b shown in (b) is prepared, and the wire mesh of spiral knitting shown in FIG. 1 is formed by using the wire 11b.
A support net having a length of m and a length of 10 m was obtained.

Support 4 As a wire rod of the wire mesh 10, a wire made of steel having a diameter of 0.35 mm was used to form the spiral mesh wire mesh shown in FIG. Molten stainless steel is sprayed and fixed to this wire net, and the height of the surface is 40 μm on average as shown in FIG. 2 (c).
A fine uneven pattern with an average pitch of 100 μm is applied,
A support net having a width of 40 cm and a length of 10 m was obtained.

Support 5 As a wire rod of the wire mesh 10, steel wire having a diameter of 0.35 mm was used to form the spiral mesh wire mesh shown in FIG. This wire net was sandwiched between two embossing rolls made of stainless steel having a fine concavo-convex pattern having a depth of 30 μm and a pitch of 150 μm and molded. As a result, a support net having a width of 40 cm and a length of 10 m in which a fine concavo-convex pattern was provided on the tops of both surfaces of the wire 11d of the wire mesh (FIG. 2 (d)) was obtained.

(Preparation of Surface Material) Example 1 A polyethylene resin (UZ-15100C, manufactured by Mitsui Petrochemical Co., Ltd.) was used as a single-screw extruder (VZ-32-T, manufactured by Sumitomo Heavy Industries, Ltd.). Extruded by the above-mentioned support 1
Pour onto 0 (support 2 used as support). The support 10 is preliminarily molded into a belt shape, and is sucked from below by a suction nozzle installed at the dropping position of the extruded resin, so that molding and opening are performed at the same time. 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 (Example 2) having a film basis weight of 30 g / m ² was obtained by the same method as in Example 1 except that Support 3 was used as the support.

Example 3 A polyolefin film (Example 3) having a film basis weight of 30 g / m ² 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 film 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 by a single-screw extruder (VZ-32-T, manufactured by Sumitomo Heavy Industries, Ltd.) to obtain a support. Pour over 1. Immediately after the film was sucked from below by a suction nozzle installed at the dropping position of the extruded resin, and the film was formed and opened at the same time, the film was pressed by an embossing roll having a diameter of 50 mm installed on the support belt. The embossing roll is preliminarily lined with rubber mixed with inorganic fine particles, and is provided with a fine uneven pattern having a softness and an average depth of 25 μm and a pitch of 150 μm.
By transferring this to the top, as shown in FIG.
A 0 g / m ² polyolefin film (Example 5) was obtained.

Example 6 In a state where the film obtained in Example 2 was not removed from the support, hot air of 120 ° C. was again blown from the upper side with a wide-mouth nozzle, and vacuum suction was further applied from the lower side.
The same embossing roll as that used in 1. 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, it was unwound onto a normal conveyor belt, and hot air of 120 ° C. was blown again from above with a wide mouth and a nozzle. Then, a steel embossing roll similar to that used in Example 5 was synchronized with the conveyor belt. The surface (top portion) of the surface material was touched while rotating at an angle angle. Thus, a polyolefin film having a basis weight of 30 g / m ² (Example 7) was obtained.

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

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

Comparative Example 3 Polyethylene resin (UZ-15100C, manufactured by Mitsui Petrochemical Industry Co., Ltd.) was placed on a conveyor belt by a single-screw extruder (VZ-32-T, manufactured by Sumitomo Heavy Industries, Ltd.). The film was developed into a film, and immediately thereafter, the same steel embossing roll as that used in Example 5 was pressed from above, and the surface was generally smooth except that it had a fine concavo-convex 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. This film is placed on a support 1, hot air of 150 ° C. is blown from above with a wide-mouth nozzle while being conveyed, and vacuum suction is performed immediately below from immediately below, so that a polyolefin film having a fine concavo-convex pattern even on the inner wall of the opening. (Comparative example 3) was obtained.

(Evaluation method) 1. Evaluation of High Viscous Liquid Residue Using the films of Examples 1 to 7 and Comparative Examples 1 to 3, FIG.
The absorbent article shown in FIG. That is, the absorbent holding sheet 22a is superposed on the lower side of the absorbent body portion 22a to form the absorbent body 22, and the absorbent holding sheet 22b is made up of the absorbent papers 22c and 22c.
The absorbent polymer 22d sprinkled 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 embodiment were used as an absorbent article shown in FIG. A sanitary napkin was prepared. In FIG. 5, reference numeral 27 is a double-sided tape, a tape or the like, and the surface material 1 was detachably fixed to the absorber 22 and the leak-proof sheet 23 to obtain a sample 20.

Each absorbent article was attached to a very movable female waist model 30 shown in FIG. 6, and shorts were put on, followed by walking for 10 minutes at a walking speed of 100 steps / minute (50 m / minute). Then, 3 g of defibrinated horse blood (highly viscous liquid) in which sodium carboxymethyl cellulose (manufactured by Wako Pure Chemical Industries, Ltd.) was added to adjust the kinematic viscosity to 50,000 cp was injected while walking with a tube 31, and then at the same speed of 10 Walk for a minute, then inject 3 g of the same defibrinated horse blood (highly viscous liquid) from the tube 31 while walking, let it lame for 10 minutes, stop the device, take out sample 20, and spread the liquid on sample 20. Was measured as (vertical spread length) × (horizontal spread length). After this, the surface material was removed from the sample, the weight was measured, and the amount of liquid remaining on the surface material was silicic acid based on the initial surface material weight measured in advance.
The same evaluation was repeated for each sample 20 for 15 points, and the average value was used as the liquid spreading area and the liquid remaining amount.

2. Texture The prepared surface material was cut into 15 × 30 cm, and the texture was evaluated according to the following procedure for each of the following items. In each evaluation, 35 women were actually touched and the results evaluated according to each procedure were averaged and expressed. 2-1. Feeling of stickiness (feeling of stickiness) Most appropriate as a word to express the feeling obtained as a whole while touching the cut sample with the tip of a finger or watching the feeling that the palm is raised on the surface material and the hand is instantly pulled up to cling I was asked to select a word from the following 5 items and evaluated it. 5: It is slatted. 4: Slightly latted. 3: Neutral. 2: Slightly sticky. 1: Sticky.

2-2. Overall evaluation While touching the cut-out samples as appropriate, the most appropriate words for expressing the feeling obtained as a whole were selected from the following 5 items and evaluated. 5: I like it. 4: I like it a little. 3: Neutral. 2: I hate it a little. 1: I hate.

(Evaluation Results) Table 1 below shows the results of evaluations based on the above-described evaluation methods for each of these Examples and Comparative Examples.

[0048]

[Table 1]

As is clear from Table 1, in the liquid spreading area, the liquid spreading areas of Examples 1 to 7 were 55 mm × 47.
mm to 60 mm × 50 mm, while Comparative Example 1 to
The spread area of No. 3 is 66 mm × 55 mm, and the product of the present invention is smaller than the spread area of Comparative Examples 1 to 3. In this embodiment, the residual amount of high-viscosity liquid is 2.00 g in each case.
Whereas below, 2.3 in Comparative Examples 2 and 3.
In this example, the residual amount of the highly viscous liquid was low, which was 5 g and 2.19 g, and good values were obtained. On the other hand, in Comparative Example 1, the residual amount of the high-viscosity liquid was 1.79 g, which seemed to be superior to those of the Examples, but the sensation and overall evaluation were significantly inferior to 1 and 2. Therefore, Comparative Example 1 is inferior to Examples 1 to 7 when comprehensively considering the satin feeling and the overall evaluation. That is, the product of this example is
The balance between the slat and soft feeling is excellent, and the area where a fine uneven pattern is applied is controlled. As a result, the amount of liquid remaining on the surface material is also suppressed, and the stickiness caused by the residual liquid is also released. . In other words, these means the realization of a surface material which does not have a "plastic" feel, has less stuffiness and stickiness, is excellent in texture, and is gentle on the skin.

[0050]

EFFECTS OF THE INVENTION According to the surface material for absorbent articles of the present invention, the absorbent material has a soft and comfortable texture without a "plastic" feel, has a small amount of liquid remaining on the surface, and is resistant to stuffiness and stickiness. It is possible to obtain a surface material for a sex article. Moreover, according to the method for producing a surface material for an absorbent article of the present invention, the surface material for the absorbent article can be suitably produced.

[Brief description of drawings]

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

FIG. 2 (a) to FIG. 2 (d) are enlarged views of a wire net having a finely textured surface.

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

FIG. 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 partial cross section. 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 diagram schematically showing a manufacturing process for manufacturing a surface material for absorbent articles.

[Explanation of symbols]

 1 Surface material for absorbent article 2 Concavo-convex pattern 3 Top part 4 Bottom part 5 Connecting part 6 Opening

Claims (6)

[Claims] 1. A surface material made of a liquid-impermeable material for covering the surface of the absorbent body of an absorbent article having an absorbent body, and made of a plastic film having innumerable holes, wherein the surface material is convex. Innumerable tops made of curved surfaces and not forming a continuous flat surface, innumerable bottoms each made of a concave curved surface, and connecting portions respectively connecting the tops and the bottoms, and each of the holes is A structure formed by the connecting part, the top part and the bottom part and having a space between the top parts, and the surface material for liquid permeation communicating with the space between the top parts on the bottom part. By forming the openings, a continuous macroscopic fold 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 absorbent articles, 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, wherein the surface material is in a range of 0 μm. 3. The areas to which the fine concavo-convex pattern is applied are 0.002 mm ² to
The surface material for absorbent articles according to claim 2, wherein the surface material is in the range of 15 mm ² . 4. The area between the adjacent areas to which the fine concavo-convex pattern is applied has a center-to-center distance of 5 in actual use.
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 absorbent articles according to claim 1, wherein the surface material is composed of a laminate of a plastic film and a non-woven fabric. 6. The method for manufacturing a surface material for an absorbent article according to claim 1, wherein a molten plastic resin is extruded from an extruder to a surface side of a knitted support to obtain a surface of the support. In the sheet forming step of forming a sheet having innumerable tops corresponding to the stitches, in the sheet forming step, the extruded molten resin is sucked from the back surface side of the support to perforate a liquid permeation opening in the sheet. And an embossing step of forming a fine concave-convex pattern only on the top of the sheet by embossing the sheet punched in the punching step from the surface side on the support. A method for producing a surface material for an absorbent article, comprising: