JP4205978B2 - Absorbent articles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to absorbent articles such as sanitary napkins and paper diapers that are used by being attached to the inside of underwear such as shorts, and more particularly to an absorbent article excellent in breathability.
[0002]
[Prior art]
Conventionally, such an absorbent article, for example, a sanitary napkin 100 as shown in a perspective view in FIG. 11, is known in various forms depending on the purpose of use, etc., but the basic configuration is substantially the same. In general, an article main body 104 is formed by a top sheet 101 having liquid permeability, a back sheet 102 having liquid impermeability, and an absorbent body 103 interposed between the sheets. A release sheet 105 is attached to the outer surface of the back sheet 102. In addition, a substantially elliptical concave body fluid reservoir 106 is provided at a substantially central portion of the article main body 104, and a three-dimensional gather 107 for preventing liquid leakage is provided on both sides in the width direction.
[0003]
FIG. 12 is a cross-sectional view taken along the line II in FIG. 11 and shows a detailed layer structure of the sanitary napkin 100. As shown in the figure, this sanitary napkin 100 covers a liquid-permeable top sheet 101, a top sheet 101 and an absorbent body 103 made of a nonwoven fabric or a resin film in order from the surface side, that is, the side in contact with the wearer's body. An adhesive layer 109 (hereinafter referred to as “first adhesive layer”) for adhering to the upper tissue 108a, an absorbent body 103 made of cotton-like pulp or a polymer, and the lower tissue The adhesive layer 110 (hereinafter referred to as “second adhesive layer”) for bonding the liquid-impervious back sheet 102 made of nonwoven fabric or the like 108b, the back sheet 102, the back sheet 102, and the release sheet 105. It consists of an adhesive layer 111 (hereinafter referred to as “third adhesive layer”) for bonding. This release sheet 105 protects the third adhesive layer 111 and prevents it from adhering to other objects. During use, the release sheet 105 is peeled off from the article main body 104, and the third adhesive layer 111 is used for underwear such as shorts. The sanitary napkin 100 is used by being attached inside.
[0004]
In addition, regarding the absorbent body 103 as described above, conventionally, as shown in a plan view of only a main part in FIG. 13, a plurality of gap portions 112 penetrating in the thickness direction of the absorbent body 103 are provided, so An absorbent article 100A (not shown) having an improved absorbent body 103A is known (see, for example, Patent Document 1).
[0005]
However, in the conventional absorbent article as described above, that is, the sanitary napkin 100 (or the absorbent article 100A), the first adhesive layer 109 is usually formed inside the top sheet 101 as shown in FIG. As shown in FIG. 15, the adhesive 113 forms an adhesive 114 that forms the second adhesive layer 110 inside the back sheet 102. As shown in FIG. 16, the third adhesive layer 111 forms outside the back sheet 102. The adhesive 115 to be formed is arranged differently in each coating position and shape.
[0006]
For this reason, when the article body 104 is configured by sequentially stacking the top sheet 101, the absorber 103, and the back sheet 102, due to the difference in the application position and shape of the adhesive 113, 114, 115 as described above, As shown in a partially broken rear view in FIG. 17, the adhesive is applied over the entire surface of the absorber 103. As a result, as indicated by an arrow X in FIG. 12, air cannot move in the vertical direction from the top sheet 101 side to the back sheet 102 side of the sanitary napkin 100, and the air permeability of the article body 104 is obstructed. There was a problem. When the air permeability of the article main body 104 is thus inhibited, the absorbent body 103 is thick, particularly when the sanitary napkin 100 is a thick type such as a night sanitary napkin. The moisture accumulated between the medical napkin 100 and the body and the heat generated from the body could not be released to the outside. As a result, stuffiness was caused by moisture and heat accumulated between the sanitary napkin 100 and the body. In this stuffiness, the excreted body fluid remains as an unfixed body fluid between the paper and pulp fibers of the absorber 103. Therefore, particularly when the amount of excreted body fluid is large, water vapor is generated from the unfixed fluid. Caused by As a result, unpleasant odors and the like are given to the wearer, and the wearer's behavior is hindered.
[0007]
Conventionally, in order to improve the air permeability of such an absorbent article, it has been proposed and put to practical use, for example, a material having good air permeability, such as polyethylene, for the top sheet 101 and the back sheet 102. However, even if the components of the top sheet 101 and / or the back sheet 102 have air permeability as described above, the air permeability is hindered by the adhesive applied when the article main body 104 is assembled as described above. However, even with such an absorbent article, the above-described improvement in air permeability was not achieved.
[0008]
[Patent Document 1]
JP-A-5-253259
[Problems to be solved by the invention]
The present invention has been made in view of the above-described circumstances, and its purpose is to improve the air permeability of the entire article formed by superimposing these components without impairing the air permeability of the components themselves. Is to provide an absorbent article.
[0010]
The object of the present invention is to provide a top sheet having at least liquid permeability, a first adhesive layer for adhering an absorbent body interposed between the top sheet and the back sheet, the absorbent body and the back sheet. In an absorbent article comprising a second adhesive layer to be bonded and a third adhesive layer to be bonded to the back sheet and underwear, the first adhesive layer, the second adhesive layer, And the third adhesive layer is extended in the longitudinal direction of the absorbent article body , and the first adhesive layer, the second adhesive layer, and the third adhesive are disposed in the longitudinal longitudinal direction of the absorbent body. a position not overlapping with all adhesive layer, the gap portion is provided, airspace is a through hole penetrating in a thickness direction of the absorbent body, also, the gap portion, the longitudinal central portion of the absorbent body Then, the opening area is large, and it should be formed gradually smaller toward each end. By providing the absorbent article to symptoms is achieved.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
[0014]
FIG. 1 is a partially broken plan view of a body fluid reservoir 206 of a sanitary napkin 200 (not shown) that is an example of an absorbent article according to an embodiment of the present invention when viewed from the top sheet 201 side. FIG. 3 is a partially broken rear view when the body fluid reservoir 206 is viewed from the back sheet 202 side, and FIG. 3 is a sectional view taken along the line II-II in FIG. The sanitary napkin 200 includes an adhesive 213 that forms the first adhesive layer 209 inside the top sheet 201, an adhesive 214 that forms the second adhesive layer 210 inside the back sheet 202, and a back sheet. For other configurations except that the application position and shape of the adhesive 215 that forms the third adhesive layer 211 on the outer side of 202 differs from the sanitary napkin 100 as will be described later, It is substantially the same as the napkin 100. For this reason, in the sanitary napkin 200, the components corresponding to the sanitary napkin 100 will be described with the same corresponding numbers in the 200s.
[0015]
As shown in FIG. 3, the sanitary napkin 200 according to the present invention is interposed between the top sheet 201, the back sheet 202, and the sheet and covered with a tissue 208, as in the conventional sanitary napkin 100. The absorbent body 203 thus bonded is adhered with adhesives 213 and 214 to form an article main body 204 (not shown). In addition, an adhesive 215 for attaching underwear or the like is applied to the outer surface of the article main body 204.
[0016]
Here, the top sheet 201 is a liquid-permeable sheet that allows body fluid to permeate through the absorbent body 203, has a touch close to underwear, is fine and has a high fiber density, such as a nonwoven fabric, or liquid permeation. For example, a resin film made of a material having excellent properties and liquid return prevention properties, such as polyethylene, polypropylene, or vinyl acetate polymer, is preferably used.
[0017]
On the other hand, the back sheet 202 is a liquid-impermeable sheet that does not allow the body fluid absorbed by the absorbent body 203 to permeate to the outside, and is a moisture-permeable material, such as an olefin resin such as polyethylene or polypropylene, and an inorganic filler. A microporous sheet obtained by stretching a kneaded mixture is preferably used.
[0018]
The absorbent 203 is preferably made of a combination of a high-molecular polymer mainly composed of a defibrated polymer, a thermoplastic resin, or cellulose fiber.
[0019]
FIG. 4 is a plan view of the absorbent body 203 with the tissue 208a on the upper side removed. As shown in the drawing, a plurality of voids 212 are provided in the longitudinal direction of the central portion in the width direction of the absorbent body 203. The gap 212 is a through hole, and the gap 212 located in the longitudinal center of the absorbent body 203, that is, in the vicinity of the blood drainage port, has a large opening area and a small opening area toward each end. It is formed to become. The gap 212 is preferably a through hole, but may be a blind hole. By forming the gap 212 in this way, the solid content in the body fluid can be accommodated in the gap 212 and the absorption area of the absorber 203 can be increased. There is an effect that the body fluid absorption rate can be improved.
[0020]
In the sanitary napkin 200, as shown in FIG. 5, an adhesive 213 for forming a first adhesive layer 209 on the inner side of the top sheet 201, and as shown in FIG. 6, a second adhesive on the inner side of the back sheet 202. As shown in FIG. 7, the adhesive 214 that forms the layer 210, and each coating position P of the adhesive 215 that forms the third adhesive layer 211 on the outside of the back sheet 202 and the shape (width) W1 of a linear stripe , W2 are all set to match. Thus, by making all the coating positions and shapes of the adhesives 213, 214, and 215 coincide with each other, an air flow path is formed in the vertical direction as indicated by an arrow Y in FIG.
[0021]
In this absorbent body 203, the air gap portion 212 overlaps with the air flow path, in other words, the air gap portion 212 of the absorbent body 203 does not overlap the first adhesive layer or the third adhesive layer. Thus, the article main body 204 is assembled. By assembling the article main body 204 in this way, an air flow path is formed in the vertical direction of the article main body 204, and a region 216 that does not hinder the air flow in the vertical direction is formed. Therefore, in the sanitary napkin 200 configured as described above, moisture and heat accumulated between the article main body 204 and the body can be released to the outside through the region 216. As a result, the air permeability of the article main body 204 is remarkably improved, and it is possible to prevent stuffiness and to prevent odor generated due to stuffiness.
[0022]
In this embodiment, a hot melt adhesive is used as the adhesives 213, 214, and 215. However, this embodiment is not limited to such a hot melt adhesive, and other known adhesives are used. Needless to say, this is applicable.
[0023]
Although the contents of the present invention have been described based on one embodiment, the present invention can be variously modified in configuration.
[0024]
FIG. 8 is a plan view showing a modified example of the absorbent body according to the present invention. As shown in the figure, this absorber 203A is provided with a rectangular gap 212A that has a large opening area in the central portion in the longitudinal direction and that gradually decreases toward the end. The planar shape of the gap 212A can be changed to various shapes such as a circle, a triangle, or a star.
[0025]
FIG. 9 shows a modified example of the first adhesive layer 209A inside the top sheet 201 according to the present invention. (The changed portion is marked with A.) In this modified example, the adhesive 213A forming the first adhesive layer 209A is coated in a wavy stripe shape. The adhesive can be applied in various shapes as long as it is a spiral shape or the like and extends in a stripe shape in the longitudinal direction of the article body.
[0026]
Further, in this modification, the main body is formed by narrowing the width at the crotch position as shown in the figure, including the top sheet 201 and all the constituent elements superimposed on the top sheet 201. For this reason, when wearing, the wearer does not feel uncomfortable in the crotch part and can freely move the leg part.
[0027]
In the present invention, as described above, it is desirable that the adhesive application positions and shapes of the first adhesive layer to the third adhesive layer are all the same, but this is changed as follows. Even applicable.
[0028]
That is, as shown in the cross-sectional view of FIG. 10, an adhesive 213B that forms the first adhesive layer 209B, an adhesive 214B that forms the second adhesive layer 210B, and an adhesive layer that forms the third adhesive layer 211B. Each coating position and coating shape (width) of 215B do not necessarily coincide with each other, and if a region 216B that does not hinder the flow of air is formed, a desired object can be achieved.
[0029]
In the above-described embodiment, the sanitary napkin having no second sheet between the top sheet and the absorber has been described. However, as described above, the air flow is inhibited between the top sheet, the second sheet, the absorber, and the back sheet. If a region without any problem is formed, there is no problem even if there is a second sheet between the top sheet and the absorber.
[0030]
Further, the contents of the present invention have been described by taking a sanitary napkin whose absorbent article has no wing as an example. However, the present invention is not limited to such a sanitary napkin, and other sanitary napkins with wings and tape-type paper diapers. Needless to say, the present invention can also be applied to known absorbent articles such as pants-type paper diapers, urine-absorbing pads, or incontinence pants.
[0031]
【The invention's effect】
As described in detail above, the absorbent article according to the present invention is configured so as to form a region in which the air flow is improved in the vertical direction of the absorbent body, so that moisture is absorbed between the absorbent article and the body. No longer accumulates. Therefore, according to the absorptive article concerning the present invention, stuffiness and a smell can be prevented and a wearer can be given a feeling of comfort.
[Brief description of the drawings]
FIG. 1 is a partially broken plan view of a body fluid reservoir, which is a main part of a sanitary napkin according to an embodiment of the present invention, as viewed from the top sheet side.
FIG. 2 is a partially broken rear view of a body fluid reservoir, which is a main part of a sanitary napkin according to an embodiment of the present invention, as viewed from the back sheet side.
3 is a cross-sectional view taken along the line II-II in FIG.
FIG. 4 is a plan view of an absorbent body according to an embodiment of the present invention.
FIG. 5 is a plan view showing a coating position and a shape of a first adhesive layer inside a top sheet according to an embodiment of the present invention.
FIG. 6 is a plan view showing a coating position and shape of a second adhesive layer on the inner side of the back sheet according to the embodiment of the present invention.
FIG. 7 is a plan view showing a coating position and shape of a third adhesive layer on the outer side of the back sheet according to the embodiment of the present invention.
FIG. 8 is a plan view showing a modification of the absorbent body of the present invention.
FIG. 9 is a plan view showing a modification of the first adhesive layer, the second adhesive layer, and the third adhesive layer of the present invention.
FIG. 10 is a cross-sectional view showing a modification example of the bonding position and shape of the adhesive of each adhesive layer of the present invention.
FIG. 11 is a perspective view of a conventional sanitary napkin.
12 is a cross-sectional view taken along the line II of FIG.
FIG. 13 is a plan view of a conventional absorber.
FIG. 14 is a plan view showing a coating position and shape of a first adhesive layer inside a conventional top sheet.
FIG. 15 is a plan view showing a coating position and shape of a second adhesive layer inside a conventional back sheet.
FIG. 16 is a plan view showing a coating position and shape of a third adhesive layer on the outside of a conventional back sheet.
FIG. 17 is a partially broken rear view of a body fluid reservoir, which is a main part of a conventional sanitary napkin, as viewed from the back sheet side.
[Explanation of symbols]
101, 201 Top sheet 102, 202 Back sheet 103, 203 Absorbent body 104, 204 Sanitary napkin body 109, 209 First adhesive layer 110, 210 inside the top sheet Second adhesive layer 111 inside the back sheet, 211 Third adhesive layers 112, 212 outside the back sheet Adhesives 114, 214 forming the first adhesive layer inside the top sheet 113, 213 Forming the second adhesive layer inside the back sheet Adhesives 115 and 215 Adhesive that forms the third adhesive layer outside the backsheet

Claims (1)

A first adhesive layer for adhering at least a liquid-permeable top sheet, an absorber interposed between the top sheet and the back sheet, and a second adhesive for adhering the absorber and the back sheet. In an absorbent article comprising a layer and a third adhesive layer for adhering the backsheet and the undergarment,
Extending the first adhesive layer, the second adhesive layer, and the third adhesive layer in the longitudinal direction of the absorbent article body;
Wherein the planar longitudinal direction of the absorbent body, said first adhesive layer, the second adhesive layer, and a position that does not overlap with any of the third adhesive layer, the gap portion is provided,
The void is a through-hole penetrating in the thickness direction of the absorber,
Moreover, the said cavity part has an opening area large in the longitudinal direction center part of the said absorber, and is formed gradually small toward each edge part direction, The absorbent article characterized by the above-mentioned.

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