JPH07184957A - Absorption article - Google Patents

Abstract

PURPOSE:To surely prevent the side leakage from both ends by making the side in contact with the absorbing body the hydrophilic one and the side in direct contact with the skin the hydrophobic one, covering directly the surface in contact with the skin and the side of the absorbing body and absorbing the liquid from the surface in contact with the skin and the side and making the width of the hydrophobic surface of the leakage preventive body wider than that of the absorbing body. CONSTITUTION:The absorption article (sanitary napkin) is provided with a liquid permeable surface member 1 and a member 3 preventing leakage and an absorbing body 2 holding the liquid. The surface member 1 directly covers the surface in contact with the skin and its side and it is fixed through a fixing agent 4 at the non-contact surface with the skin, and the surface member 1 and the member 3 are fixed through the fixing agent 4 at the non-contact surface with the skin. The surface member 1 is hydrophobic on the skin contact surface. The side in contact with the absorbing body 2 is hydrophilic. The surface member 1 directly covers the skin contact side and its side of the absorbing body 2. The liquid is absorbed from the skin contact surface and its side. The member 3 is provided with the hydrophobic surface and its width is made wider than that of the absorbing body 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorbent article such as a sanitary napkin and a pad for an incontinent person, which a user wears with underwear such as shorts (hereinafter represented by "shorts") in a narrow crotch area. Specifically, it relates to an absorbent article having a simple structure and a high degree of leakproofness.

[0002]

BACKGROUND OF THE INVENTION Conventional absorbent articles such as sanitary napkins and incontinence pads are basically liquid-permeable surface materials, liquid-retaining absorbers, and liquids. It is configured with an impermeable leak preventer. Then, in recent years, the absorption performance has been improved by introducing a new material into each member such as an absorbent polymer and a liquid-permeable surface material.

However, even if the new material is introduced and each member has an excellent performance,
In actual use, there was still leakage from the crotch and buttocks, etc., and it was difficult to say that overall performance of the absorbent article was sufficiently exhibited as a whole.

The main cause of such a leak is that an irregular force is applied to the absorbent article that has been worn due to the user's activity, etc., causing the absorbent article to be displaced from the predetermined wearing position, or the absorbent article to be defective. Due to regular deformation, twisting occurs,
For example, the distance between the excretion site, the absorbent article, and the end is reduced.

The leakage caused by the above and also is greatly affected by the shorts worn by the user. For example, when wearing loose shorts that do not come into close contact with the body, the effect is great, and the above-mentioned leakage easily occurs even with a relatively low absorption capacity.

Further, since the conventional absorbent article is substantially vertically long, the width of the absorbent body is narrow, and due to the above-mentioned two main causes, the leakage from the side end is predominant among the leaks. Many. In order to prevent such leakage, the side edges of the absorbent article may be rolled up with a liquid-impermeable leak preventer (see
No. 9-190227), the side end of the absorbent article is made hydrophobic (Japanese Patent Publication No. 59-39134), and a leak preventive wall is installed at the side end (Japanese Utility Model Publication No. 59-190227). It is made discontinuous by a seal or the like (JP-A-48-6).
Although various techniques have been proposed, such as in Japanese Patent No. 3071), in actual use, since the mounting position and the mounting form cannot be controlled due to misalignment and twisting, the respective leak preventive effects cannot always be exhibited.

Therefore, in order to solve these problems, a large number of absorbent articles have been proposed in which a pair of flexible flaps are respectively extended outward in the width direction from the central portions of both longitudinal ends of the absorbent article. (Japanese Patent Application Laid-Open No. 60-75058, Japanese Patent Application Laid-Open No. 1-11002, etc.).

Absorbent articles having these flaps are
When the absorbent article is fixed to the shorts by wrapping each flap around the shorts at the time of use, the stability is further stabilized and the leakproofness is improved. However,
These absorbent articles can effectively prevent the above-mentioned leakage to some extent when properly installed in a regular position, but depending on the shorts to be worn, for example, the close contact with the body is weak. If you wear shorts whose width of the shorts or crotch part is larger than that of the absorbent part, even if you fix the absorbent article to the crotch part with a flap, the absorbent article may be twisted or the flap may be Since the absorbent article is rolled up and covers the surface of the absorbent article, there is a problem that it is not always possible to effectively prevent leakage.

Therefore, an object of the present invention is to absorb lateral leakage from both end portions without fail, regardless of the exercise conditions of the wearer and without being influenced by the type of shorts worn. To provide a sex article.

[0010]

Means for Solving the Problems As a result of various studies on the absorbent article which effectively prevents the leakage from the crotch even if any shorts are worn, the present inventors have found that the liquid permeability used in the absorbent article can be improved. It was found that the above object can be achieved by using a specific surface material as the surface material.

The present invention has been made based on the above findings, and has a liquid-permeable surface material, a liquid-impermeable leak preventer, and a liquid-retaining absorber interposed between these members. In the absorbent article formed substantially vertically, (a) the surface material is hydrophobic on the skin contact surface side and hydrophilic on the side in contact with the absorbent body, and (b) is the surface material. The absorbent body can directly cover the skin contact surface side and the side surface, and the absorbent can absorb liquid from the skin contact surface side and the side surface. And an absorbent article having a hydrophobic surface and having a width wider than that of the absorbent body.

[0012]

In the absorbent article of the present invention, the skin-contacting surface side of the surface material is hydrophobic and the side contacting the absorbent body is hydrophilic, and the surface material is the skin-contacting surface side and side surface of the absorbent body. And the absorbent body is capable of absorbing liquid from the skin contact surface side and the side surface. Further, the leak preventer has a hydrophobic surface and the width thereof is the absorbent body. Since it is wider than the width of the absorption part, body fluid can be absorbed from the side surface of the absorption part, and even in the wearing shape where both ends of the napkin are rolled up by using loose shorts, the absorption area is wide and the leakproof material is used. The cover can be surely covered and the body fluid can be absorbed without soiling the shorts. Further, even in a situation where the body fluid slightly leaks from the side surface portion of the absorbent body and leaks out, the bleeding body fluid can be covered with the leak preventer without soiling the shorts and can be absorbed again from the side surface portion of the absorbent article.

[0013]

The present invention will be described in detail below with reference to the drawings, and the present invention will be specifically described with reference to examples and comparative examples.

First, the present invention will be described in detail with reference to FIGS. 1 is a perspective view showing an example of the absorbent article of the present invention, and FIG. 2 is a sectional view taken along line II-II of FIG.
FIG. 3 is a perspective view showing another example of the absorbent article of the present invention (FIG.
4 is a sectional view taken along line IV-IV in FIG.
FIG. 5 is a cross-sectional view (corresponding to FIG. 2) showing a cross section of a conventional (comparative example) absorbent article, and FIG. 6 is a cross-sectional view showing a cross section of another conventional (comparative example) absorbent article (FIG. 2). (Corresponding figure).

Absorbent article of the present embodiment (sanitary napkin)
As shown in FIGS. 1 and 2, reference numeral 10 denotes a liquid-permeable surface material 1 that comes into contact with the skin and allows passage of body fluid such as menstrual blood, and a leak preventive material 3 that comes into contact with shorts and prevents body fluid from leaking. It is configured to have a liquid-retaining absorber 2 interposed between the sheets 1 and 3, and is formed substantially vertically.

More specifically, in the absorbent article 10, the surface material 1 directly covers the skin contact surface side and the side surface of the absorbent body 2, and the fixative 4 is provided on the non-skin contact surface side. Further, the surface material 1 and the leak preventer 3 are fixed via the fixing agent 4 on the non-skin contact surface side. Further, on the surface of the leak preventer 3 on the non-skin contact surface side,
A slip preventing agent 5 for fixing to the shorts at the time of use is provided, and the slip preventing agent 5 is protected by a release paper 6.

Thus, the absorbent article 10 according to this embodiment.
(A) The surface material 1 is hydrophobic on the skin contact surface side and hydrophilic on the side in contact with the absorber, and (b) the surface material 1 is the skin contact surface on the absorbent body 2. The side surface and the side surface are directly covered, and the absorbent body 2 can absorb the liquid from the skin contact surface side and the side surface. (C) The leak preventer 3
Has a hydrophobic surface and its width is wider than that of the absorbent body 2.

The above (a) to (c) will be described below. Incidentally, the points which are not described in detail are the same as those of the conventional sanitary napkin. First, the above (a) will be described.

In order to achieve the above-mentioned object of the present invention, the liquid-permeable surface material used for the absorbent article is subjected to a very high wearing pressure under all conditions of use, for example, when loose shorts are used. Even under low conditions, it is necessary to design so that body fluid can be smoothly absorbed and permeated, no body fluid remains on the surface, and body fluid once absorbed does not return to the surface. For that purpose, the surface material 1 cannot be achieved when both the skin contacting surface side and the non-contacting surface side thereof are both hydrophobic or hydrophilic. If both surfaces are hydrophobic, the ability to absorb body fluid will be poor, and body fluid discharged from the surface of the surface material will flow especially under low wearing pressure. On the contrary, if it is hydrophilic, it easily absorbs body fluid, but body fluid remains on the surface, or body fluid once absorbed returns to the surface under pressure.

Therefore, in the present invention, the surface material satisfying the above (a), that is, the skin contact surface side of the surface material is hydrophobic and the non-skin contact surface side (absorber side) is hydrophilic. A surface material with a designed hydrophilic gradient is used. As a result, even under a low wearing pressure, body fluid can be smoothly absorbed and, on the contrary, it is difficult to return to the surface side, and further, since the side in contact with the skin is hydrophobic, it is difficult for the liquid to remain on the surface. .

Next, the above (b) and (c) will be described. In the absorbent article 10, as shown in FIG. 2, the surface material 1 directly covers the skin-contacting surface side and the side surface of the absorber 2, and absorbs the liquid directly from the skin-contacting surface side and the side surface. The leak preventive material 3 has a hydrophobic surface, and its width is wider than the width of the absorbing portion. And the absorbent article 10 of this invention is the above (a)-.
By satisfying all of (c), it is possible to effectively prevent leakage from the crotch even if any shorts are worn.

For example, as shown in FIG. 7, when loose loose shorts are worn, the absorbent article 10 tends to have a concave mounting shape at the central portion.
Not only the negative side that the mounting pressure of the excretion part becomes low, but also the both ends of the absorbent article roll up, resulting in a very small absorption area.

An absorbent article having a structure in which the leak preventive material 3 shown in FIG. 5, which is a conventional sanitary napkin having an improved leak preventive effect on the side portion, is rolled up from the inside of the surface material 1, and FIG.
In the absorbent article having the structure in which the leak preventive material 3 is rolled up from the outside of the surface material 1, when loose loose shorts are worn, not only the leak preventive effect of the side portion is improved, but also the absorbent surface is further reduced. To reduce the leakage prevention effect.

In the absorbent article 10 of the present invention, body fluid can be absorbed on the entire surface of the absorbent body 2 by satisfying the above condition (b). Further, by satisfying all of the above (a) to (c), even if loose shorts are worn as shown in FIG. 7 and both ends of the absorbent article are rolled up and the absorbent area is reduced. Body fluid can be absorbed over the entire surface from the skin contact surface to the side surface, and since the surface side of the above surface material is hydrophobic and the absorbent side is hydrophilic, no body fluid remains on the surface of the surface material and the absorbent body smoothly Is absorbed by.

Even when the absorbent article 10 is further displaced, as shown in FIG. 2, the width (3
Since W) is wider than the width (1 W) of the absorber 2, the leakage preventive material 3
Even if a part of the body fluid is splashed on, the body fluid on the leak preventer can be absorbed from the side surface of the absorbent body 2 without soiling the shorts.

Also, in the sanitary napkin of which there is a risk of leakage among the absorbent articles, unlike the case where a large amount of urine is excreted at once such as a paper diaper, a large amount of body fluid is excreted little by little. It is extremely rare that the leaks are caused by the above-mentioned two main causes and the amount of blood that bleeds from the end and stains the shorts. Thus, even if a small amount of blood bleeds from the side of the absorbent body, in the absorbent article 10 of the present invention, the leak preventive material 3 does not stain the shorts, and at a lower absorption amount, that is, absorption. In a situation where there is room for absorption on the side of the body, the blood bleeding on the leak preventer 3 can be again absorbed into the absorber from the side.

As described above, by satisfying the above (a) to (c), the absorbent article 10 of the present invention has the effect of being extremely difficult to leak under any wearing condition. As described above, it is essential for the absorbent article of the present invention to satisfy the above (a) to (c), and even if any one is missing, it becomes insufficient. For example, the actual development Sho 59-1902
In one embodiment of Japanese Patent No. 26, the above (b) and (c)
The absorbent article which satisfies the above is shown, but the above (a)
Is not described at all, and as described above, if the above (a) is not satisfied, the desired effect of the present invention cannot be obtained. Furthermore, if the above condition (a) is not satisfied, the above-mentioned leakage prevention effect of the side surface portion cannot be obtained.

That is, if both surfaces of the surface material 1 are hydrophilic, the side surface portion of the absorbent article 10 has low leakproofness (water resistance) and easily leaks to the side surface due to pressure, and conversely it is hydrophobic. In this case, the side surface is highly leak-proof, but as described above, it has no ability to absorb the once leaked blood from the side surface again, and blood bleeding on the leak-proof material is not absorbed. And so on.

In the absorbent article which does not satisfy the above (b), for example, in the absorbent article having the structure shown in FIG. 5 described above, not only the above-mentioned reason but also the once leaked blood should be absorbed from the side surface again. I can't.

When the above condition (c) is not satisfied,
That is, if the width of the leak preventer (3 W) is narrower than the width of the absorbent part (1 W), the back of the absorbent body may leak to the shorts, and if the leak preventer has a hydrophilic surface, the blood is prevented. It leaks by bleeding on the leaked material. The difference (3W-1W) between the width of the leak preventer (3W) and the width of the absorption part (1W) effectively expresses the function of allowing blood that has once leaked to the side surface to be absorbed by the absorber again without polluting the shorts. Therefore, the thickness is preferably 5 mm or more, more preferably 10 to 100 mm. Specifically, in the absorbent article which does not have a flap on the side surface portion shown in FIGS. 1 and 2, 10 to 30 mm is preferable, and FIGS.
In the absorbent article having a flap on the side surface as shown in, it is preferably 60 to 100 mm.

Further, in order to further develop the effect of re-absorption from the side surface, twisting occurs or the width of the absorber (1
Even if W) is deformed, it is preferable that the width (3 W) of the leak preventer is always wider than the width (1 W) of the absorbing portion. It is preferable that the width (5W) between the outermost portions of the anti-displacement agent is made wider than the width (4W) between the fixatives 4 for fixing the, and the difference in width (5W-4W) is 5 mm or more, and further, More preferably, it is 5 to 100 mm. Specifically, in the absorbent article having no flap on the side surface portion, 5 to 20 mm is preferable, and in the absorbent article having the flap on the side surface portion,
60-100 mm is preferable.

Next, another example of the absorbent article of the present invention will be described with reference to FIGS. 3 and 4. The absorbent article 10 shown in FIGS. 3 and 4 has side flaps formed by extending the center of both side edges of the leak preventer 3 outwardly. Further, by having the side flap, the width of the leak preventer can be surely designed to be wider than the width of the absorber under all wearing conditions. In the case of such a napkin with a flap, the width between the deviation preventing agents in the flap portion corresponds to the outermost width of the deviation preventing agent. Incidentally, the points and the like not specifically described are the same as those in the examples shown in FIGS. 1 and 2 described above.

The surface material 1 which can be used in the absorbent article of the present invention will be further described. The skin contact surface side of the surface material is preferably polyethylene or polypropylene so that it does not get wet even when absorbing body fluid. And a hydrophobic film such as a polyolefin selected from the group consisting of copolymers thereof and the like.

The term "hydrophobic" as used herein means that the liquid does not spread on the skin-contacting surface side and the surface has a contact angle of more than 90 °.
The contact angle is the angle of the water drop between the water / air interface and the water / fixed interface at the normal junction of the two interfaces. The contact angles of the above-mentioned polyolefins are all larger than 90 ° and have a hydrophobic surface (for example, 94 ° for polyethylene and 95 ° for polypropylene). "Goto, T., Surface, 27,689 (1989)"].

The term "hydrophilic" means that the surface on the non-skin contact surface side spreads the liquid by itself, that is, 90 °.
It means having a smaller contact angle, and in order to absorb body fluid from the surface more quickly, it is preferable that the contact angle is 30 ° or less.

On the non-skin contact surface side, the contact angle of the surface is obtained by coating or internally adding a surfactant to the surface of a hydrophilic material such as polyvinyl alcohol, rayon, pulp or a polyolefin such as polyethylene or polypropylene. It is possible to preferably use a polymer having a reduced hydrophilicity and modified to be hydrophilic.

At this time, as a preferable surfactant to be used, a nonionic surfactant can be used as long as the contact angle is 90 ° or less, preferably 30 ° or less by coating on the surface. Anionic surfactants, cationic surfactants, amphoteric surfactants and the like can be used without particular limitation. For example, as specific examples of these surfactants, "New Edition Surfactant Handbook = Second Edition = Issued Date: January 20, 1991, Publisher: Engineering Book Co., Ltd."
The surfactants described on pages 13 to 36 can be mentioned.

Among them, nonionic surfactants and anionic surfactants are excellent because of their performances other than wetting characteristics such as heat resistance, light resistance, oxygen resistance and organic solvent resistance. Of these, a single system or a mixed system of two or more types is selected in accordance with the required performance. Specific examples of preferable surfactants include C8-C18 alkyl glucosides and fatty acids (C8-C18).
C18) sorbitan ester, fatty acid (C8-C18) polyoxyethylene sorbitan ester, polyoxyethylene fatty acid (C8-C18) ester, etc. HLB3-2
0 nonionic surfactant, and alkali metal salt of C8-C24 alkyl phosphate ester, amine salt, alkali metal salt of alkyl sulfate, alkali metal salt of alkyl or alkylbenzene or alkylnaphthalene sulfonate, polyoxyethylene alkyl ether sulfate. And an anionic surfactant such as an alkali metal salt of alkyl sulfosuccinate.
Only one of them may be used, or they may be mixed and used.

As an example of the surface material which can be more preferably used in the present invention, a surface material as shown in FIG. 8 can be mentioned. The surface material 1 shown in FIG. 8 is formed of a polyolefin-based hydrophobic film 21 on the skin contact surface side and a non-woven fabric 22 made of synthetic fibers hydrophilized with paper or a surfactant on the non-skin contact surface side. The sheet obtained by laminating the both is perforated to form a recess 23 having a hole 24.
Is formed.

Further, as another preferable example of the surface material, a perforated film obtained by perforating a polyolefin film, more specifically, a large number of tops made of convex curved surfaces having voids on the back side and a large number of An opening bottom portion and a cylindrical wall portion connecting the top portion and the opening bottom portion, respectively, and each hole portion connecting a plurality of adjacent top portions and one opening bottom portion and connecting them. And an opening film having a communicating hole structure, each of which is formed by a single cylindrical wall portion and which constitutes the opening portion for liquid permeation by the opening bottom portion, and is further selectively formed only on the back surface side. A perforated film obtained by applying a surfactant to the skin is hydrophobic on the skin contact surface side and hydrophilic on the back surface side only with the surfactant. As a method of applying the surfactant, a conventionally known method can be used, and for example, the back surface side can be selectively applied by a method such as spray coating or gravure coating.

In order to obtain such a perforated film, a molten resin made of the above-mentioned polyolefin is added to the resin shown in FIGS. 9A and 9B.
By using a right-handed or left-handed same-direction spiral braided wire netting 11 and performing hot air treatment or the like, a space is formed along the surface shape of the wire netting 11 and between the wire rods 11a of the spiral braided wire netting 11 described above. It can be obtained by forming into a sheet having holes at corresponding positions.

With reference to FIGS. 10 and 11, the surface material made of the above-described apertured film will be specifically described. The surface material 1 made of the above-described apertured film is shown in FIG. 10A.
As shown in FIG. 10C, a large number of tops 35 each having a convex curved surface with a void on the back side, a large number of bottoms 36 of apertures,
A cylindrical wall portion 37 that connects the top portion 35 and the hole bottom portion 36, respectively, is provided, and each of the hole portions 34 includes a plurality of adjacent top portions 35, one hole bottom portion 36, and
Each of them is formed from a single cylindrical wall portion 37 connecting them, and the opening bottom portion 36 constitutes an opening portion for liquid permeation. Then, as shown in FIGS. 11A and 11B, the surface material 1 is made hydrophilic by applying a surfactant 20 on the non-skin contact surface side.

The composition of the leak preventer 3 is not particularly limited as long as it has a hydrophobic surface and does not allow liquid to permeate. A laminated non-woven fabric in which a non-woven fabric having a hydrophobic surface and polyethylene are laminated and a polyolefin waterproof film such as polyethylene can be preferably used. In addition, regarding the material of the absorbent body 2, the fixing agent, the deviation preventive agent, and the like, points that are not particularly described can be configured in the same manner as the conventionally known absorbent article.

Hereinafter, the absorbent article of the present invention will be specifically described with reference to Examples and Comparative Examples. In the following examples, a sanitary napkin will be described as an example, but the present invention can be similarly applied to other absorbent articles such as incontinence pads. First, production examples of the surface material, the absorber and the leak preventive material will be shown below.

[Liquid-permeable surface material A] A mixture of an alkyl phosphate and a sorbitan fatty acid ester A polyethylene / polypropylene composite fiber (manufactured by Chisso Corp.) having a surfactant adhering thereto at 0.34% by weight was used. Quantity 25
25 μ of low-density polyethylene [manufactured by Mitsui Petrochemical Co., Ltd.] 21 is laminated on a dry heat-bonded nonwoven fabric 22 of g / m ² ,
The surface material A shown in FIG. 8 was obtained. The surface material A is such that the size of the openings 24 in the wall 23 is 0.1 to ² mm ² and the density of the holes is 52 holes / cm ² , and the hydrophobic surface made of low density polyethylene 21 and the nonwoven fabric 22 It has a hydrophilic surface consisting of.

[Liquid-permeable surface material B] A low density polyethylene 21 (manufactured by Mitsui Petrochemical Co., Ltd.) was extruded from a T die, and a molten resin was extruded onto a spiral braided wire net 11 shown in FIG. 9A to conform to the surface shape. Suction hole forming was performed in the above shape to obtain an apertured film shown in FIG. 10A. Then, from the back side of the obtained apertured film, decyl glucoside AG10
(HLB16, manufactured by Nippon Seika Co., Ltd.) An aqueous solution was selectively coated by a gravure roll coater only on the back side of the film at 0.2 wt% based on the weight of the film, and the back side was made a hydrophilic surface. A surface material B made of a film was obtained.

[Liquid-permeable surface material C] Mixed basis of alkyl phosphate and sorbitan fatty acid ester A basis weight formed using polyethylene-polypropylene composite fiber (manufactured by Chisso Corporation) to which 0.34% by weight of a surfactant is attached. 25 g
The dry heat-bonded non-woven fabric of / m ² was used as the surface material C. The surface material C is hydrophilic both on the front surface and the back surface.

[Liquid-permeable surface material D] Using a hydrophobic polyethylene / polypropylene composite fiber (manufactured by Chisso Corporation) which has not been hydrophilically treated with a surfactant, the basis weight is 25 g / m ^2.
The surface material was prepared in the same manner as the surface material A, except that the nonwoven fabric of No. 1 was prepared and the nonwoven fabric was the non-woven cloth 21 to obtain the surface material D. The surface material D is a surface material composed of a perforated film that is hydrophobic on both the front surface side and the back surface side.

[Liquid-Retaining Absorber A] An ultra-thin absorbent sheet composed of a commercially available ultra-thin napkin [trade name: "Free Day Safety Slim", manufactured by Kao Corporation) and a super-absorbent polymer. The body was designated as absorber A.

[Liquid-Retaining Absorber B] A commercially available regular type napkin [trade name: “FREEDAY”, manufactured by Kao Corporation) is used as an absorber made of absorbent paper, flap pulp, and superabsorbent polymer. It was designated as absorber B.

[Liquid Impermeable Leak-Proof Material A] A polyethylene film obtained by forming a low-density polyethylene [manufactured by Mitsui Petrochemical Co., Ltd.] at a basis weight of 50 g / m ² was used as a leak-proof material A.

[Liquid Impermeable Leakage Preventing Material B] Using a hydrophobic polyethylene / polypropylene composite fiber [manufactured by Chisso Corporation] which has not been hydrophilically treated with a surfactant, the basis weight is 30 g / m ^2.
A non-woven fabric was manufactured by using the above-mentioned method, and low-density polyethylene [manufactured by Mitsui Petrochemical Co., Ltd.] was laminated on the non-woven fabric at 30 g / m ² , and a hydrophobic laminated non-woven fabric having a basis weight of 60 g / m ² was used as a leak preventer B.

[Liquid-permeable Leakage Preventing Material C] A mixed weight of alkyl phosphate and sorbitan fatty acid ester A polyethylene / polypropylene composite fiber (made by Chisso Corporation) having 0.34% by weight of a surfactant adhering to the basis weight. 30 g / m ²
The non-woven fabric of No. 1 was produced, and low-density polyethylene [manufactured by Mitsui Petrochemical Co., Ltd.] was laminated on the non-woven fabric at 30 g / m ² , and a hydrophilic laminated non-woven fabric having a basis weight of 60 g / m ² was used as the leak preventive material C.

Example 1 As the liquid-permeable surface material 1,
The surface material A having a width of 130 mm and a length of 225 mm was cut and used (the hydrophilic surface was used as the non-skin contact surface and the hydrophobic surface was used as the skin contact surface). Further, the absorbent body A was used as the liquid-retaining absorbent body 2, and the absorbent body 2 was wrapped with the surface material 1. Liquid impermeable leak preventer A is 90mm wide and 225mm long.
The leak-proofing material 3 obtained by cutting into pieces was fixed using the hot-melt pressure-sensitive adhesive 4 as the fixing agent 4. Furthermore, on the leak preventer 3,
As the slip preventive agent 5, a hot melt adhesive is used with a basis weight of 30 g.
/ M @ 2, width 20 mm, length 135 mm, two coatings were carried out to prepare a sanitary napkin (invention product 1) having the structure shown in FIGS.

Here, the width 1 W of the absorber portion is 75 mm, the width 3 W of the leak preventer is 90 mm, and the gap 4 between the leak preventer and the absorber is 4
The width W is 60 mm, and the width of the gap preventing agent 5 W is 70 mm.

Example 2 Example 1 was repeated except that the absorber B was used as the absorber 2 and the leak preventer B was used as the leak preventer 3.
A sanitary napkin (invention product 2) having the structure shown in FIGS. Here, the width 1W of the absorber is 7
2 mm, the width of the leak preventer 3 W is 90 mm, the gap 4 W between the leak preventer and the absorber is 60 mm, and the gap 5 W between the gap preventers is 70 mm.

Example 3 A sanitary napkin (invention product 3) having the structure shown in FIGS. 1 and 2 was prepared in the same manner as in Example 1 except that the surface material B was used as the surface material 1. Here, the width of the absorber portion 1 W, the width of the leak preventer 3 W, the space between the fixatives 4 W, and the gap between the gap preventing agents are the same as in Example 1.

Example 4 As the liquid-permeable surface material 1,
The surface material B was cut into a width of 130 mm and a length of 225 mm and used (the hydrophilic surface was used as the non-skin contact surface and the hydrophobic surface was used as the skin contact surface). Further, the absorbent body A was used as the liquid-retaining absorbent body 2, and the absorbent body 2 was wrapped with the surface agent 1.
Further, a leak preventer A having a width of 160 mm and a length of 225 mm and having side flaps provided at both end portions was formed on the leak preventer 3, and a hot melt adhesive was used as a fixing agent 4. Used and fixed. Furthermore, as the slip prevention agent 5,
Two pieces of hot melt adhesive having a basis weight of 30 g / m @ 2, a width of 20 mm and a length of 135 mm are coated on the back side of the central portion of the leak preventive material 3, and the side flaps have a width of 25 mm and a length of 30 mm.
2 were applied to prepare a sanitary napkin (invention product 4) having the structure shown in FIGS. 3 and 4.

Here, the width 1 W of the absorber portion is 75 mm, the width 3 W of the leak preventer is 160 mm, the spacing 4 W between the fixing agent between the absorbing part and the leak preventer is 60 mm, and the width between both side edges of the deviation preventive agent is 60 mm. 5W is 150mm.

[Comparative Example 1] A sanitary product having the structure shown in FIGS. 1 and 2 was prepared in the same manner as in Example 1 except that the leak preventive material C was used as the leak preventive material 3 and the hydrophilic nonwoven fabric side was used as the skin side. A napkin (Comparative product 1) was prepared.

Comparative Example 2 As in Example 1, except that a liquid-permeable surface material C was used as the surface material 1, FIG.
A sanitary napkin (Comparative Product 2) having the configuration shown in 2 was prepared.

Comparative Example 3 A sanitary napkin (Comparative Product 3) having the structure shown in FIGS. 1 and 2 was prepared in the same manner as in Example 1 except that the surface material D was used as the surface material 1.

Comparative Example 4 As the liquid-permeable surface material 1,
The surface material C having a width of 130 mm and a length of 225 mm was cut and used. Further, the absorbent body B is used as the liquid-retaining absorbent body 2,
The absorber 2 was wrapped with the surface material 1. A leak preventive material 3 obtained by cutting the leak preventive material A into a width of 100 mm and a length of 225 mm was fixed thereto by using a hot melt adhesive 4 as a fixing agent 4. Here, the leak preventive material 3 is rolled up from the side end, and the surface material 1 and the leak preventive material 3 are fixed at the skin contact surface side end to form a sanitary napkin. A sanitary napkin (Comparative Product 4) was obtained by applying a slip preventive agent in the same manner as in Example 1 except for these.

Comparative Example 5 Example 4 was repeated except that the surface material C was used as the surface material 1 and the leakage prevention material C was used as the leakage prevention material 3.
A sanitary napkin (comparative product 5) having the configuration shown in FIGS. 3 and 4 was prepared in the same manner as in.

Next, the product 1 of the present invention in Examples 1 to 4
4 to 4 and Comparative Products 1 to 5 in Comparative Examples 1 to 5 in order to observe the absorption performance of each sanitary napkin, the following methods are used to absorb liquid droplets, reduce leakage, and absorb from side portions of the absorbent body. Sex was performed on each sanitary napkin, and the results are shown in [Table 1] below.

[0066]

[Table 1]

(1) Droplet Absorbency Test This test is for conducting an absorptivity test in the absence of pressure, and is a test for observing the absorptivity from the surface under a low mounting pressure. The test sanitary napkins obtained in Examples and Comparative Examples are placed horizontally. Next, use a Komagome pipette to remove defibrinated horse blood (manufactured by Japan Biotest Institute)
1 drop (about 0.
5g) Drop. It is determined whether defibrinated horse blood is absorbed within 1 second after being dropped on the surface. Drop a total of 10 drops,
The number of droplets absorbed within 1 second was counted.

(2) Pressure Leakage Test This test is a side leakage test when pressure is applied from above after absorbing 10 g of defibrinated horse blood. Specifically, as shown in FIG. 12, a test sample (sanitary napkin) 42 is placed horizontally on a cotton kanakin cloth 41 cut into a length of 250 mm and a width of 100 mm, and defibrinated horse blood is placed in the center of the napkin. Is absorbed at a rate of 10 g per minute for 10 g. One minute after the blood is completely absorbed, a 70 × 100 mm pressure plate 43 with a 10 mm thick urethane foam as a cushioning material is placed on the blood injection part and over the entire width of the napkin to prevent partial pressure. Place it like this and add 50g / cm
Place the weight 44 so that the load of ² is applied. After placing a weight on it and leaving it for 1 minute, remove the load and judge whether blood has leaked to the cotton kanakin. The evaluation criteria are as follows.

◯: No leakage ×: Leakage With respect to Comparative product 3, since it was difficult to absorb blood, 10 g of the product was forcibly injected and evaluated.

(3) Absorbency test from the side surface This test shows that blood is absorbed in the absorbent body when the napkin is mounted with a shift and when the side surface of the napkin is rolled up and mounted as shown in FIG. It is a test to check whether it is absorbed by. A test sample (sanitary napkin) was placed horizontally on a cotton kanakin, and a total of 3 g of defibrinated horse blood was dropped with a pipette between the side surface of the napkin and the leak preventer. One minute after dropping the liquid, the napkin was removed and it was determined whether the cotton kanakin was stained with blood. The evaluation criteria are as follows.

○: No leakage ×: Blood leaked

As is clear from the results shown in [Table 1],
The products of the present invention 1 to 4 have droplet absorbability as compared with the comparative products 1 to 5,
It is clear that the evaluation is excellent in all evaluations such as the pressure leakage property and the absorbability from the side surface, and the desired effect of the present invention can be obtained only when all of the above (a) to (c) are satisfied. I understand.

[0073]

The absorbent article of the present invention is capable of reliably preventing lateral leakage from both side edges regardless of the exercise conditions of the wearer and regardless of the type of shorts worn. It is possible.

Specifically, even under a low wearing pressure, the body fluid can be smoothly absorbed without remaining on the surface of the absorbent article, and it is difficult to return to the surface. Even if any shorts are worn, the leakage from the crotch is effective. Can be prevented. Furthermore, when the absorbent article is displaced or even when the body fluid slightly exudes from the side surface, the body fluid can be absorbed again from the side surface portion,
It is a highly leak-proof absorbent article capable of extremely suppressing leakage under any use condition of the user.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of an absorbent article of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a perspective view (corresponding to FIG. 1) showing another example of the absorbent article of the present invention.

4 is a sectional view taken along line IV-IV of FIG.

FIG. 5 is a cross-sectional view (corresponding to FIG. 2) showing a cross section of a conventional (comparative example) absorbent article.

FIG. 6 is a sectional view (corresponding to FIG. 2) showing a section of another conventional (comparative example) absorbent article.

FIG. 7 is a schematic diagram showing a state of an absorbent article when loose loose shorts are worn.

FIG. 8 is a partially enlarged schematic view showing an example of a surface material preferably used in the present invention.

9A and 9B are schematic views showing a wire mesh used in manufacturing a surface material preferably used in the present invention.

FIG. 10A is a schematic view showing another example of the surface material preferably used in the present invention, and FIG.
10A is an enlarged view of part of FIG. 10A, and FIG. 10C is an enlarged cross-sectional view of FIG. 10A.

11A and 11B are partially enlarged cross-sectional views showing another example of the surface material preferably used in the present invention.

FIG. 12 is a schematic diagram showing an apparatus used in a reduction leak test.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical indication location A61F 5/44 H 7108-4C A61F 13/18 320 332 (72) Minoru Nakanishi Minoru Kawachi, Tochigi Prefecture 3298−75 Yakushiji Temple, Kawachi Town Green Town 208 Block 1-2

Claims (2)

[Claims] 1. An absorbent article which is formed substantially vertically and has a liquid-permeable surface material, a liquid-impermeable leak preventer, and a liquid-retaining absorber interposed between these members. In (a) the surface-contacting surface of the absorbent material is hydrophobic and the side contacting the absorbent body is hydrophilic, and (b) the surface-contacting surface of the absorbent material is the skin-contacting surface side and the side surface. And the absorbent body is capable of absorbing liquid from the skin contact surface side and the side surface. (C) The leak preventer has a hydrophobic surface and its width is An absorbent article, characterized in that it is made wider than the width of the absorbent body. 2. The leak preventive material has a fixing agent fixed to the surface material and / or the absorbent body and a deviation preventing agent to fix the underwear, and the fixing agent in the width direction of the absorbent article. The absorbent article according to claim 1, wherein a width between both side edges of the deviation preventive agent is wider than a width between them.