JP3696063B2 - Sanitary article surface material - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a surface material for sanitary products such as sanitary napkins and diapers, and more particularly to a surface material for disposable sanitary products.
[0002]
[Prior art]
In general, absorbent articles such as sanitary napkins and diapers cover an absorber that absorbs liquids such as blood and urine, a surface material that covers the surface of the absorber and is applied to the skin of the human body, and a back surface of the absorber. It is composed of a back material that prevents liquid leakage.
[0003]
And the above-mentioned surface material is absorbed by the absorbent once and the liquid permeability that allows the liquid such as blood and urine to permeate, so that the blood, urine and the like on the skin side are transferred to the absorber and absorbed by the absorber. The liquid return prevention property which does not return a liquid to the skin side is requested | required.
[0004]
[Problems to be solved by the invention]
In order to improve such a liquid return preventing property, conventionally, a technique using a hydrophobic sheet having openings formed in the surface material as the surface material (Japanese Utility Model Laid-Open No. 54-124398, Japanese Patent Application Laid-Open No. 57-1340, JP-A 61-45753) and perforated films having a capillary structure (JP-B 57-17081, JP-A 60-259261, JP-A 1-249052) have been proposed. When these techniques try to enlarge the aperture area in order to give sufficient liquid permeability, the absorber is visually observed through the large aperture portion, so that the shielding property is bad, and the user feels visually uncomfortable. There is a problem.
[0005]
On the other hand, if the aperture area is reduced in order to improve the shielding property, the liquid permeability is deteriorated, and the surface wet state continues for a long time at the point of contact with the human body.
[0006]
Accordingly, an object of the present invention is to provide a sanitary article surface material that is excellent in maintaining a dry surface state and excellent in shielding properties.
[0007]
[Means for Solving the Problems]
The present invention is a surface material using an opaque resin film made of a liquid-impermeable material that covers the surface of an absorbent body of a sanitary product including the absorbent body, and projects to the surface side disposed on the absorbent body side. And a plurality of recesses formed of a wall part and a bottom part, and only a part of the bottom part of the recess part is formed with a liquid-permeable opening, respectively , The object is achieved by providing a sanitary article surface material characterized by being formed in a convex spherical shape on the protruding surface side .
[0008]
[Action]
According to the absorbent article using the surface material of the sanitary article of the present invention, the liquid on the skin side of the surface material is formed on the surface by an opening formed only at a part of the bottom of the recessed portion formed in the surface material. It smoothly flows to the absorber side through the material and maintains a dry surface between the human body and the surface material.
[0009]
On the other hand, the liquid on the absorber side, i.e., the liquid absorbed by the absorber, is difficult to see because the opening is formed only in a part of the bottom.
[0010]
【Example】
Hereinafter, the surface material of the sanitary article of the present invention will be described in detail with reference to the accompanying drawings. 1 to 3 are diagrams showing a first reference example of the present invention, and FIGS. 4 to 6 are diagrams showing a second reference example of the present invention . Surface material of these reference example, as illustrated, except that different from the surface material of the present invention is configured of the recessed portion and the opening is the same as the surface material of the present invention. Accordingly, in the description of these reference examples, description of the same points as the surface material of the present invention is applied properly to the description of embodiments of the present invention described below. 7 and 8 are diagrams showing an embodiment of the present invention.
[0011]
First, a first reference example of the present invention will be described with reference to FIGS.
[0012]
The surface material 1 of the first reference example is a surface material made of a liquid-impermeable material that covers the surface of the absorbent body of a sanitary article including the absorbent body, and projects to the surface side A disposed on the absorbent body side. It has the recessed part 10 which consists of the formed wall part 12a, 12b and bottom part 13a, 13b, and two opening 14a, 14b for liquid penetration is formed in this recessed part 10. As shown in FIG.
Like the conventional surface material, the recesses 10 are formed in a large number so as to be uniformly distributed over the entire surface, and the distance between the adjacent recesses 10 is approximately the same as the diameter of the recesses 10. Is set.
[0013]
In the first reference example, as shown in FIGS. 1 and 2, the recessed portion 10 is formed in a bifurcated shape. Cylindrical wall portions 12a and 12b divided into two are extended obliquely so as to form a V shape with each other, and openings 14a and 14b are formed at the tip portions thereof. The pair of openings 14a and 14b are formed in a substantially elliptical shape. And the center part 15 between cylindrical wall parts 12a and 12b is slightly depressed from the surface, and is formed in the substantially strip | belt shape.
[0014]
Surface material 1, Ri opaque der to impart opacity for by liquid like absorbed in the absorbent body, also resin film Ru is used as the liquid-impermeable material.
[0015]
The thickness of the resin film layer is preferably 3 to 50 μm, and examples of the resin film include polyolefin, copolymer resins of olefin and other monomers, synthetic resins, and blended polymers thereof .
[0016]
The ratio of the area of the apertures 14a and 14b formed in the bottom 3 (hereinafter referred to as the aperture area ratio) is preferably less than 80% with respect to the opening of the recessed portion 10, and the total area of the surface material when viewed from above the surface material It is preferable that the area of the opening portion with respect to is less than 50%. This is because when the aperture area ratio is 80% or more or 50% or more with respect to the total surface material area, the visual shielding property is poor.
[0017]
In addition, it is preferable that the magnitude | size of the opening of the recessed part 10 is about 0.1-50 mm < ² > measured at the top part. In order to hold the liquid to be absorbed in the recessed portion 10 and quickly isolate it from the human body, the distance between the top and the top in the vertical direction from the plane formed by the top in the recessed portion is 0.2 to It is preferably 3.0 mm. The number of the recessed portions 10 per unit area is preferably 4 pieces / cm ^{2 to} 80 pieces / cm ² , and is about 20 pieces / cm ² in the first reference example.
[0018]
Next, the preferable manufacturing method of the surface material concerning a 1st reference example is demonstrated. As shown in FIG. 3, the surface material according to the first reference example is formed by stacking two plates 16a and 16b each having a plurality of circular holes 15 so that the holes partially overlap each other. 16a and 16b are arranged in a shifted manner, a sheet film is heated and melted, or a resin film eluted from a T-die is placed on a plate or roll having a predetermined hole shape, and air or other fluid is sprayed on the film, or the film is The sheet is formed by suction.
[0019]
Next, operation | movement of the surface material of the sanitary goods by a 1st reference example is demonstrated.
When the surface material of the first reference example is used as the surface material of the sanitary napkin, the liquid on the surface material 1 (liquid on the skin side of the human body) enters the recessed portion 10 and is formed in the bottom portions 13a and 13b. It is absorbed into the absorber (not shown) through the holes 14a and 14b. In this case, since the liquid introduced into the recessed portion 10 is quickly introduced into and passes through the openings 14a and 14b of the bottom portions 13a and 13b, the top portion 1a of the surface material 1 in contact with the human body is always kept in a dry surface state. .
[0020]
Since the openings 14a and 14b are formed only in a part of the bottom portions 13a and 13b, the liquid that has passed through or that has been absorbed and absorbed by the absorber becomes difficult to see from the outside, and the concealing property is maintained. The
[0021]
Further, since the openings 14a and 14b are only a part of the bottom portions 13a and 13b, the shape retaining property of the recessed portion 10 in the surface material 1 is excellent, so that the liquid is not easily crushed and is absorbed under pressure. Improves the ability to prevent liquid return. Therefore, by reducing the area efficiency of the hole portion, it is possible to improve the mold retaining property of the recessed portion and improve the liquid return suppressing force of the absorbing liquid under pressure.
[0022]
Further, since the surface material 1 is formed with the recessed portion 10 so that the surface material 1 itself has few portions in contact with the skin, the feeling of stickiness on the surface can be reduced.
[0023]
Next, a second reference example of the present invention will be described with reference to the above-described first reference example shown in FIGS. 1 to 3 and FIGS. In the second reference example , the description in the first reference example is appropriately applied to points that are not particularly detailed.
[0024]
In the second reference example , as shown in FIGS. 4 to 6, the top portion 1 a and the wall portion 22 are bounded by a folding line 21. Although there is no clear distinction between the wall portion 22 and the bottom portion 23, the wall portion is a portion in a direction perpendicular to the recessed portion 20, and the bottom portion is a portion intersecting therewith. The top portion 1a refers to a portion where the recessed portion 20 is not formed, that is, a non-recessed portion of the surface material 1.
[0025]
An opening 24 having a predetermined size is formed in each bottom portion 23 in a strip shape so as to cross the bottom portion 23.
[0026]
Such a surface material 1 of the second reference example is manufactured by an ordinary method as disclosed in, for example, Japanese Patent Publication Nos. 1-248524 and 2-162268. That is, the impermeable sheet is allowed to flow between a roll formed with a pressing mold having a convex portion corresponding to the recessed portion 20 and a roll formed with a pressing mold fitted to the convex portion. The push mold is fitted. At this time, the pressing die forms the recessed portion 20 in the sheet and applies a shearing force to the sheet to form the opening 24.
[0027]
As another manufacturing method, a film in a sheet state is heated and melted, or a resin film eluted from a T-die is placed on a plate or roll having a predetermined hole shape, and a fluid such as air is sprayed on the film, or the film is sucked. By doing so, a recess is formed, and at the same time, an opening is formed. Further, the concave portion may be molded and the hole may be perforated by applying a mechanical force such as punching. At this time, it is preferable that the film or the like is softened by heat or other methods to facilitate molding and perforation.
[0028]
The embodiment of the present invention will be described with reference to the first reference example shown in FIGS. 1 to 3, the second reference example shown in FIGS. 4 to 6, and FIGS. In the embodiments of the present invention, the description in the first reference example and the second reference example is appropriately applied to points that are not described in detail.
In the embodiment of the present invention , as shown in FIGS. 7 and 8, unlike the second reference example , the recessed portion 30 is formed in a spherical shape instead of a quadrangular frustum shape. In addition, the opening 34 is formed in a circular shape at a substantially central portion of the bottom 33. In this case, the top part 1a and the wall part 32, the wall part 32, and the bottom part 33 are changing continuously, and cannot be clearly distinguished. In the present invention, it is needless to say that such a distinction is not necessarily clarified. However, the bottom 33 of the concave portion 30 having the shape shown in FIGS. 7 and 8 is defined as follows. be able to. The bottom portion 33 is a portion including the deepest portion 35 in the recessed portion 30 and a portion 33 having an angle α formed by the tangent line X and the plane Y including the top portion 1a in the portion 36 where the recessed portion 30 is present (less than 30 °) ( (See FIG. 8). It is possible to obtain the same effect as in the second reference example, according to the actual施例this.
[0029]
[0030]
[0031]
The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.
For example, the number of openings formed in the bottom is not limited to one or two for each bottom, but may be three or more.
[0032]
【The invention's effect】
The surface material of the sanitary article of the present invention is excellent in maintaining a dry surface and excellent in shielding properties.
Furthermore, since there are few parts which touch skin, there is no stickiness of the surface.
[Brief description of the drawings]
FIG. 1 is a plan view of a surface material according to a first reference example of the present invention.
FIG. 2 is a cross-sectional view of a recessed portion of a surface material according to a first reference example.
FIG. 3 is a plan view of a plate used for manufacturing a surface material according to a first reference example.
FIG. 4 is a perspective view of a second reference example of the present invention.
FIG. 5 is a perspective view showing a recessed portion shown in FIG. 4;
6 is a cross-sectional view of the recessed portion shown in FIG.
FIG. 7 is a perspective view of a concave portion of a surface material according to an embodiment of the present invention ,
8 is a cross-sectional view of a recessed portion shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Surface material 12a, 12b, 22, 3 2 Wall part 13a, 13b, 23, 3 3 Bottom part 14a, 14b, 24, 3 4 Opening 10 , 20, 30 Recessed part

Claims (2)

A surface material using an opaque resin film made of a liquid-impermeable material that covers a surface of the absorbent body of a sanitary product including the absorbent body,
A plurality of concave portions formed of wall portions and bottom portions, which are formed so as to protrude on the surface side arranged on the absorber side, and only a part of the bottom portion of the concave portions is an opening for liquid permeation, respectively. Is formed,
The sanitary article surface material , wherein the concave portion is formed in a convex spherical shape on the protruding surface side .   The sanitary article surface material according to claim 1, wherein the opening is formed in a central portion of the bottom.

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