JP3527031B2 - Absorbent articles - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to absorbent articles such as sanitary napkins and incontinence pads, and more particularly to absorbent articles excellent in leakproofness and also in feeling of use.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
In absorbent articles such as sanitary napkins, excreted bodily fluid flows on the surface of the topsheet without being absorbed by (a) the absorbent, or (b) dust in the topsheet in the lateral direction of the absorbent article. However, (c) there is a problem that the once absorbed body fluid oozes out to the top sheet of the absorbent article and bleeds laterally, resulting in liquid leakage from the side surface. For this reason,
In order to solve such a problem, JP-A-64-45
No. 801, Japanese Examined Patent Publication No. 57-45178, and Japanese Utility Model Publication No. 2-88625 disclose absorbent articles having grooves along the longitudinal direction of the absorbent articles.
Japanese Utility Model Laid-Open No. 3-33262 and Japanese Patent Laid-Open No. 2-277.
Japanese Patent No. 453 or the like proposes an absorbent article in which a leak-proof wall is formed at a side edge portion of the absorbent article.

However, the absorbent articles according to the above and the above proposals have not yet sufficiently satisfied the above problems. That is, in the absorbent article according to the above and the above proposals, in the case of an ideal mounted state in which the shapes of the groove and the leak preventive wall are stabilized in the same shape as before mounting, the absorbent article flows on the surface. Lateral leakage can be suppressed to some extent by trapping body fluid in the groove or the leak preventive wall. However, since the absorbent article according to the above and the above proposal has the groove and the leakproof wall, the distance between the topsheet and the absorber is reduced,
There has been a problem that once absorbed body fluid easily returns from the absorber to the top sheet, causing the top sheet to bleed and leak.

Therefore, an object of the present invention is to provide an absorbent article in which the flow of surface liquid and the liquid bleeding in the top sheet which cause the lateral leakage are suppressed and the lateral leakage prevention property is remarkably improved. .

[0005]

Means for Solving the Problems The inventors of the present invention have made diligent studies to solve the above-mentioned problems, and as a result, a leak-proof sheet such as the above-mentioned back sheet is arranged on both left and right sides of the surface, and a pair of hydrophobic regions are formed. It has been found that an absorbent article, which is formed and in which the hydrophobic regions have grooves formed along the longitudinal direction of the absorbent article, can achieve the above object.

The present invention has been made on the basis of the above findings, and includes a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber interposed between the top sheet and the back sheet. comprising, in an absorbent article comprising a substantially elongated form, the absorbent article is, in the right and left sides at the surface, are formed a pair of hydrophobic regions toward the side edges inward, the hydrophobic The leak-proof area is
Or the back sheet is arranged and formed,
The hydrophobic region has a continuous or discontinuous leak-proof groove formed along the longitudinal direction of the absorbent article, the leak-proof groove does not have a hole portion, and the top. Seat and top
The leak-proof sheet or the back sheet and the absorber,
The present invention provides an absorbent article, characterized in that it is adhered on the bottom side of the leak-proof groove .

[0007] Also, the present invention, the width of the anti-Momizo is, 0.
1 to 20 mm, and the ratio of the depth of the leakproof groove to the thickness of the absorbent article in the portion where the leakproof groove is not formed is 0.01 to 0.8. Depth is 0.1
There is provided the absorbent article as described above, which is 12 mm.
Further, in the present invention, the width of the leakproof groove is 0.1 to 10 mm, and the ratio of the depth of the leakproof wall to the thickness of the absorbent article in the portion where the leakproof groove is not formed is 0. The depth of the leak-proof groove is 1 to 8 mm, and the absorbent article is provided. Further, in the present invention, the width of the leakproof groove is 0.1 to 10 mm, and the ratio of the depth of the leakproof groove to the thickness of the absorbent article in a portion where the leakproof groove is not formed. Is 0.01 to 0.5, and the depth of the leakproof groove is
There is provided the above absorbent article, which is 0.1 to 8 mm. Further, in the present invention, the width of the hydrophobic region is 3 to 30.
The width of the water-absorbing region located between the pair of hydrophobic regions is 30 to 70 mm, and the absorbent article is provided.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in more detail with reference to the drawings. Here, FIG. 1 is a partially cutaway perspective view showing an embodiment of a sanitary napkin as an absorbent article of the present invention, and FIG. 2 is a sanitary napkin II-II shown in FIG.
FIG.

A sanitary napkin 1 as an absorbent article of the present embodiment shown in FIGS. 1 and 2 has a liquid-permeable top sheet 2
And a liquid impermeable back sheet 3 and the top sheet 2
And an absorber 4 interposed between the back sheets 3 and formed substantially vertically. Such a structure is the same as that of a conventionally known sanitary napkin.

More specifically, as shown in FIGS. 1 and 2, in the sanitary napkin 1, the top sheet 2 is provided so as to cover the front surface, the left and right side surfaces, and the back surface side of the absorbent body 4. The back sheet 3 is fixed to the top sheet 2 on the back surface side of the absorber 4 with an adhesive. A leak preventive sheet 5 is provided between the absorber 4 and the top sheet 2.

Further, an adhesive agent is applied to the surface of the back sheet 3 to form a shift preventing portion 6. Here, as a material for forming the top sheet 2, the back sheet 3, and the absorber 4, generally known materials can be used without particular limitation.

Further, the material for forming the leakproof sheet 5 can be used without particular limitation as long as it is used as a leakproof sheet in a sanitary napkin or the like.

Thus, the sanitary napkin 1 has a pair of hydrophobic areas A formed on both sides of the surface thereof from the side edge 7 toward the inside (toward the water absorbing area B described later). The hydrophobic region A has a continuous leak-proof groove 10 formed along the longitudinal direction of the sanitary napkin. The leak-proof groove 10 has a hole as shown in FIG.
Absent.

More specifically, the leak preventive sheet 5 is arranged between the absorbent body 4 and the top sheet 2 so as to cover the back surface of the absorbent body 4, the left and right side edges, and the left and right sides of the front surface. Thus, a pair of hydrophobic regions A are formed on the left and right sides of the surface of the sanitary napkin, and a water absorbing region B located between the hydrophobic regions A is formed.

The width w of the leakproof groove 10 is preferably 0.1 to 20 mm, more preferably 0.1 to 10 mm.
Is. Further, the ratio (D / T0) of the depth D of the leakproof groove 10 to the thickness T0 of the portion of the sanitary napkin 1 where the leakproof groove 10 is not formed is 0.01 to 0.8. The depth D of the leakproof groove 10 is preferably 0.1 to 12 mm.
Is preferred.

Further, when designing an absorbent article which is used for a long time and which is used for a long time and which is more resistant to leakage,
It is preferable to form the leakproof groove firmly. For this purpose, the width W of the leakproof groove 10 is preferably 0.1 to 10 mm, and the leakproof groove 10 having a depth D is formed. The ratio (D / T0) of the portion where the groove 10 is not formed to the thickness T0 of the sanitary napkin 1 is preferably 0.3 to 0.8, and the depth of the leakproof groove 10 is 1 to More preferably, it is 8 mm. In addition, when the wearing feeling is enhanced by using a soft fluff pulp absorber, the leak-proof groove 10
Is preferably made shallower. For this purpose, the width W of the leakproof groove 10 is preferably 0.1 to 10 mm, and the leakproof groove 10 having a depth D of the leakproof groove 10 is formed. The ratio (D / T0) to the thickness T0 of the sanitary napkin 1 at the portion where no is formed is preferably 0.01 to 0.5, and the depth of the leakproof groove is 0.1 to 8 mm. Is preferred. As described above, the depth of the leakproof groove 10 and the leakproof groove 1
It is desirable that the ratio of the depth of 0 to the thickness of the sanitary napkin 1 be appropriately selected according to the required performance and the purpose of use.

If the width W of the leakproof groove 10 is less than 0.1 mm, the effect of the leakproof groove 10 to suppress the diffusion of body fluid flowing on the surface of the topsheet or oozing into the surface material becomes poor. If it exceeds 20 mm, the feeling of wearing may deteriorate, which is not preferable. Further, the leak-proof groove 10
If the ratio of the depth D to the thickness T0 of the portion of the sanitary napkin 1 in which the leakproof groove 10 is not formed is less than 0.01, the leakproof groove 10 is too shallow and has flowed on the surface or dust. 0.8 may not be able to trap body fluid effectively
If it exceeds, the portion where the leak-proof groove 10 is formed is strongly compressed, so that the rigidity of the portion where the leak-proof groove 10 is formed is excessively improved and the wearing feeling may be deteriorated, which is not preferable. If the depth D of the leakproof groove 10 is less than 0.1 mm, the leakproof groove 10 may be too shallow to effectively trap body fluid that has flowed or oozes on the surface.
If the thickness exceeds mm, it is not preferable to design such a leak-proof groove 10 because the thickness of the entire absorbent article becomes too thick and the wearing feeling may be deteriorated.

The width Wa of the hydrophobic area A is 3 to 3
The width Wb of the water absorbent region B located between the pair of hydrophobic regions A is preferably 30 to 70 mm. The width Wa of the hydrophobic region A is 3 mm
When it is less than, the hydrophobic region becomes too narrow and it is difficult to form the leak-proof groove 10 thereon due to processing. When it exceeds 30 mm, the width of the absorbent region B becomes narrow and the absorbability deteriorates. It is not preferable because there is. If the width Wb of the water-absorbent region B is less than 30 mm, the absorbing area may be too small and may not be stably absorbed in various wearing states. If it exceeds 70 mm, the required hydrophobic region is designed, This is not preferable because the entire absorbent article may become too wide and the wearing feeling may deteriorate.

The distance d1 from the inner edge of the hydrophobic area A to the leak-proof groove 10 is preferably 1 to 20 mm, and the outer edge of the hydrophobic area A (side edge of the sanitary napkin). To the leak-proof groove 10 is 1 to 2
It is preferably 0 mm. If the distance d1 is less than 1 mm, the hydrophobic region until reaching the groove is narrow and the amount of body fluid diffused into the groove is large, and if it exceeds 20 mm, the hydrophobic region from the absorbent region B to the leak-proof groove 10 is large. Is wide, which may reduce the area of the absorbent region, which is not preferable. When the distance d2 is less than 1 mm, the distance from the leak-proof groove 10 to the absorbent article side edge is short,
Depending on the wearing condition, the underwear may come into contact with the leakproof groove 10 to cause lateral leakage, and if it exceeds 20 mm, the hydrophobic area formed outside the leakproof groove 10 covers the groove during wearing. It is not preferable because it may happen.

Since the sanitary napkin 1 of the present embodiment has the leak-proof groove 10 in the hydrophobic region A, the liquid once absorbed does not exude to the surface again to cause a surface liquid flow, The bleeding of the liquid in the top sheet can be suppressed, and further the liquid bleeding can be effectively suppressed by the leakproof groove 10. Also,
Since it has the leak-proof groove 10 having the above-mentioned configuration, even if the napkin is twisted due to the usage state of the sanitary napkin, the space and the step of the leak-proof groove 10 can be maintained, and the leak-proof performance depends on the usage state. It does not decrease (in particular, this effect is remarkable in the case of the leakproof groove 10 that satisfies the width and depth ranges described above). Further, as described above, since the liquid does not seep out in the hydrophobic region, the liquid accumulates in the leakproof groove 10,
No discomfort to the user. Therefore, the absorbent article of the present invention is clean and has excellent leakproofness, and is excellent in usability.

The sanitary napkin 1 of the present embodiment described above is manufactured by a generally known method after producing a grooveless sanitary napkin,
By using an embossing roll or the like, the sanitary napkin can be easily manufactured by compressing (heating and compressing if necessary) along the longitudinal direction of the sanitary napkin.

Next, another form of the absorbent article of the present invention will be described with reference to FIGS. Here, FIG.
4 is a cross-sectional view (corresponding to FIG. 2) in the width direction showing another embodiment of the sanitary napkin as the absorbent article of the present invention.
FIG. 5 is a cross-sectional view (corresponding to FIG. 2) in the width direction showing another form of the sanitary napkin as the absorbent article of the present invention.
6 is a cross-sectional view (corresponding to FIG. 2) in the width direction showing another form of the sanitary napkin as the absorbent article of the present invention.
FIG. 4 is a cross-sectional view (corresponding to FIG. 2) in the width direction showing another form of the sanitary napkin as the absorbent article of the present invention. In addition, here, the points that are different from the sanitary napkin of the embodiment shown in FIGS. 1 and 2 will be described. For the points that are not particularly described, the description regarding the sanitary napkin in the form shown in FIGS. 1 and 2 is appropriately applied.

In the sanitary napkin 1 of the form shown in FIG. 3, the backsheet 3 is formed by being extended outward of the napkin at the central portion in the longitudinal direction of the napkin. It has a pair of flaps 20.

In the sanitary napkin 1 shown in FIG. 4, the top sheet 2 covers the front surface and the left and right side surfaces of the absorbent body 4, and the absorbent body 4 is provided on the back surface side of the sanitary napkin 1.
The side flap portion C is formed by extending outward from the side edge of the sheet, and the extended portion is bonded to the back sheet 3 with the leak preventive sheet 5 interposed. . The leak preventive sheet 5 is arranged between the absorber 4 and the top sheet 2 on both left and right sides of the surface of the sanitary napkin 1.

In the sanitary napkin 1 of the form shown in FIG. 5, the back sheet 3 is extended outward from the side edge of the absorbent body 4 on the back surface side of the sanitary napkin 1, and further The absorber 4 is bent toward the body 4 side, and is provided so as to cover the side surface and the side portion of the surface of the absorber 4. The top sheet 2 covers the front surface and the left and right side surfaces of the absorbent body 4 and extends outward from the side edge of the absorbent body 4 on the back surface side of the sanitary napkin 1. The formed portion is attached to the folded back sheet 3 to form the side flap portion C. That is,
In the sanitary napkin 1 of the present embodiment, the hydrophobic region A is formed by disposing the back sheet 3 on both sides of the surface. As described above, it is optional whether the hydrophobic region is formed by the back sheet or by disposing another leak preventive sheet.

In the sanitary napkin 1 shown in FIG. 6, the top sheet 2 is provided in contact with the absorber 4. Further, the back sheet 3 is provided so as to cover the surface of the top sheet 2 and to cover the back surface, the left and right side surfaces, and the left and right sides of the surface of the sanitary napkin 1, whereby the hydrophobic area A is formed. Has been done. As described above, it is arbitrary which of the top sheet 2 and the back sheet 3 (or the leak preventive sheet 5) is positioned on the outermost surface of the absorbent article.

The absorbent article of the present invention is not limited to the above-described form and can be variously modified without departing from the gist of the present invention. For example, in the above-described embodiment, the description has been made on the case where the continuous leakproof groove 10 is provided, but the present invention is not limited to this, and a large number of leakproof grooves 10 having a rectangular shape such as a rectangular shape or a circular shape can be absorbed. It may have a non-continuous leakproof groove 10 formed along the longitudinal direction of the article. Also, the shape (cross-sectional shape) of the leak-proof groove 10 is not limited to the above-mentioned form, and the shape of the bottom surface of the leak-proof groove 10 is undulated, the cross-sectional shape is triangular, the bottom surface of the leak-proof groove 10. The portion may have various shapes such as a shape in which the portion is further concave. Further, the leak-proof groove 10 may be provided in a plurality of two or more on each of the left and right sides. Further, in the leakproof groove, the top sheet, the backsheet and the absorber are preferably bonded to each other, and particularly preferably to the bottom side of the leakproof groove in order to prevent leakage.

[0028]

The absorbent article of the present invention suppresses the flow of surface liquid and the liquid bleeding in the top sheet, which causes the above-mentioned lateral leakage, and is extremely improved in the lateral leakage prevention property.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of a sanitary napkin as an absorbent article of the present invention.

FIG. 2 is a II-II sectional view of the sanitary napkin shown in FIG.

FIG. 3 is a cross-sectional view (corresponding to FIG. 2) in the width direction showing another embodiment of the sanitary napkin as the absorbent article of the present invention.

FIG. 4 is a cross-sectional view (corresponding to FIG. 2) in the width direction showing another embodiment of the sanitary napkin as the absorbent article of the present invention.

FIG. 5 is a cross-sectional view (corresponding to FIG. 2) in the width direction showing another embodiment of the sanitary napkin as the absorbent article of the present invention.

FIG. 6 is a cross-sectional view (corresponding to FIG. 2) in the width direction showing another embodiment of the sanitary napkin as the absorbent article of the present invention.

[Explanation of symbols] 1 Absorbent articles (sanitary napkins) 2 top sheet 3 back sheet 4 absorber 5 Leak prevention sheet 10 Leakage prevention groove

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Minoru Nakanishi Minoru Nakanishi 2606 Akabane Kai, Haga-gun, Tochigi Prefecture Kao Institute of Stock Companies (56) Reference JP-A-9-70413 (JP, A) JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) A61F 13/15-13/84

Claims (5)

(57) [Claims] 1. A liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber interposed between the top sheet and the back sheet, and formed substantially vertically. In the absorbent article, the absorbent article has a pair of hydrophobic regions formed inwardly from the side edges on both left and right sides of the surface thereof, and the hydrophobic region is a leak-proof sheet or the backsheet. But
Provided that is formed by, the hydrophobic region is formed along the longitudinal direction of the absorbent article has a continuous or discontinuous proof Momizo, the anti Momizo is a hole It does not have the above-mentioned top sheet and the leak-proof sheet or the above-mentioned back sheet.
And the absorber on the bottom side of the leakproof groove.
An absorbent article characterized by being worn . 2. The width of the leak-proof groove is 0.1 to 20 mm, and the ratio of the depth of the leak-proof groove to the thickness of the absorbent article in the portion where the leak-proof groove is not formed. 0.01-0.8
2. The absorbent article according to claim 1, wherein the leak-proof groove has a depth of 0.1 to 12 mm. 3. The width of the leakproof groove is 0.1 to 10 mm, and the ratio of the depth of the leakproof wall to the thickness of the absorbent article in a portion where the leakproof groove is not formed is 0. It is 0.3-0.8, and the depth of this leak-proof groove is 1-8 mm, The absorbent article of Claim 1 characterized by the above-mentioned. 4. The width of the leak-proof groove is 0.1 to 10 mm, and the ratio of the depth of the leak-proof groove to the thickness of the absorbent article in the portion where the leak-proof groove is not formed. 0.01-0.5
The depth of the leak-proof groove is 0.1 to 8 mm, and the absorbent article according to claim 1. 5. The absorbent according to claim 1, wherein the hydrophobic region has a width of 3 to 30 mm, and the water absorbent region located between the pair of hydrophobic regions has a width of 30 to 70 mm. Sex goods.