JPH04242645A - Absorbent article - Google Patents

Abstract

PURPOSE:To provide an absorbent article which can prevent excretion from leaking. CONSTITUTION:A pair of resilient members 14, 14 are arranged extending from a back side part 7 of a body 5 to an inside leg part thereof by way of a belly side part 8 thereof and opposing to each other. The space between the pair of resilient members 14, 14 is wider in the inside leg part 6 than those in the back side part 7 and the belly side part 8, and a pocket 16 is formed during wearing thereof.

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 disposable diapers, used for infants, adults, menstrual use, and incontinent persons.

0002

2. Description of the Related Art Various leakage prevention mechanisms for the crotch portion of disposable diapers have been proposed. For example, Japanese Patent Publication No. 52-40267, Japanese Patent Publication No. 54-1
No. 15939, Japanese Patent Application Laid-open No. 120045/1983,
and Japanese Patent Application Laid-Open No. 57-89602, as shown in FIG.
2 are arranged in a straight line to form gathers in the crotch area, and the gathers are brought into close contact with the wearer's crotch area to prevent excrement from leaking. Also, JP-A-49-93143, JP-A-50-33044, JP-A-50-161347, JP-A-52-
The absorbent articles described in JP-A No. 84041 and JP-A-57-210004 are so-called box pleat diapers in which pockets are formed by folding back portions on both sides of the absorbent body in the longitudinal direction. Absorbent articles are also designed to create pockets by folding back the absorbent body to improve the absorption, retention, and sealing properties of excreta.

[0003] Also, JP-A-58-65002, JP-A-62-199802, and JP-A-62-19
The absorbent article disclosed in Japanese Patent No. 9806 has side flaps on both longitudinal edges, and a technique is disclosed in which a folded portion is provided on the side flap to form a pocket. All of these techniques, like those described in the above-mentioned publications, are intended to improve the absorption, retention and sealing properties of excreta.

Furthermore, in recent years, Japanese Unexamined Patent Application Publication No. 62-25
No. 0201, Japanese Patent Application Laid-Open No. 62-223303, etc., have proposed a technique in which a side flap of a disposable diaper is provided with an elastic side wall portion to improve the ability to contain and retain excrement.

[0005]

[Problems to be Solved by the Invention] However, in the former box pleat type disposable diaper, the absorbent material is folded back to form a sealing mechanism with the absorbent material. Difficult to fit your body shape,
Another problem was that it was difficult to follow changes in body shape during activities. In addition, since the folded absorbent core is configured to fit around the legs, body fluids and other excreta absorbed by the absorbent core in that area may overflow onto the top sheet and wet bedding, etc. There was a problem that excrement leaked and caused discomfort.

On the other hand, the latter type of disposable diaper with folded side flaps has flexible pockets, so the pockets may collapse due to body pressure of the wearer or changes in body shape during activities, and sometimes the side flaps may fold inward. There was a problem in that the sealing properties were deteriorated.

[0007] In addition, the former box pleat type and the latter absorbent articles with multi-layered side flaps complicate the manufacturing process and hinder high-speed productivity, and the folded dimensions of the absorbent articles are not stable. Lacks sex. moreover,
These articles have problems in that the folded portions are thick and bulky, making them uncomfortable to wear, and also extremely unsightly for some wearers, making these absorbent articles unsuitable for normal use.

[0008] Therefore, the object of the present invention is to provide a simple structure,
An object of the present invention is to provide an absorbent article having pockets capable of preventing leakage of excrement.

[0009]

[Means for Solving the Problems] The present invention includes a main body having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body located between these two sheets. , in an absorbent article that is divided into a crotch area located under the wearer's crotch, a ventral part located on the ventral side, and a dorsal part located on the back side when worn, on both sides of the main body in the longitudinal direction. A pair of elastic members is stretched across the abdominal part, the crotch part, and the dorsal part, and the distance between the pair of elastic members at the crotch part is set so as to extend between the ventral part and the dorsal part. The above object has been achieved by providing an absorbent article characterized in that the absorbent articles are arranged at wider intervals than the sides.

0010

[Operation] According to the absorbent article according to the present invention, the main body is unfolded, and the dorsal part is located on the wearer's back side, the crotch part is located under the wearer's crotch, and the ventral part is located on the wearer's ventral side. and wear it.

[0011] When worn, in its natural state, the main body:
Gathers are formed in the crotch area due to the stretching force of the elastic members, but the distance between the pair of elastic members in the crotch area
Since it is formed wider than the back side part, an elastic force acts on the gathers in the crotch area toward the inside of the main body, and the gathers stand up toward the inside to form a pocket.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the invention will now be described in detail with reference to FIGS. 1 to 5 of the accompanying drawings.

In the embodiments described below, a disposable diaper for infants will be used as an example of the absorbent article.

As shown in FIG. 1, the disposable diaper 1 includes:
A liquid-permeable top sheet 2 forming the side that contacts the wearer's skin, a liquid-impermeable back sheet 3, and an absorbent body 4 disposed between these two sheets 2 and 3 that absorbs excrement. It has a main body 5.

[0015] The top sheet 2 absorbs excrement into the absorbent body 4.
It is preferable to use a liquid-permeable sheet that has a feel similar to that of underwear; such liquid-permeable sheets include:
For example, woven fabrics, nonwoven fabrics, porous films, etc. are preferred. In addition, a method of applying a hydrophobic compound such as a silicone oil or paraffin wax to the peripheral edge of the top sheet 2, or a method of applying a hydrophilic compound such as an alkyl phosphate ester in advance and washing the peripheral edge with warm water can be used to make the top sheet 2 repellent. After water treatment,
It is possible to prevent leakage due to oozing of urine or the like in the peripheral portion.

The back sheet 3 is made of a moisture permeable, liquid impermeable sheet that is made by adding a filler to a thermoplastic resin and stretched and is permeable to steam, or a material that has a feel similar to underwear, such as a water repellent nonwoven fabric or film. A composite material with a non-woven fabric, a composite material with a film and a woven fabric, etc. are used.

[0017] The absorbent material 4 is preferably one mainly made of defibrated pulp and combined with a high-molecular water-absorbing polymer, or preferably a mixture of a thermoplastic resin, cellulose fiber, or a high-molecular water-absorbing polymer that is heat-treated. . The water-absorbing polymer may be present in any of the upper layer, middle layer, and lower layer, and may be mixed with the pulp. The high-molecular water-absorbing polymer is preferably in the form of particles that have the ability to absorb and retain liquid of 20 times or more its own weight and have the property of gelling. Preferred are starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, crosslinked sodium carboxymethyl cellulose, acrylic acid (salt) polymers, and the like. The shape is preferably an hourglass shape that matches the body shape of the wearer, but it may also be rectangular.

The main body 5 is formed into an hourglass shape constricted at the center in the longitudinal direction (vertical direction in the figure), and a crotch portion 6 is formed at the constricted portion. In the hourglass-shaped wide part,
A dorsal side part 7 located on the back side of the wearer is formed, and a ventral side part 8 located on the ventral side of the wearer is formed in the other wide part.

Waist flaps 9, 9 extending outward from the absorbent body 4 are formed at both ends of the main body 5 in the longitudinal direction of the back side portion 7 and the ventral side portion 8, respectively. A pair of left and right side flaps 10, 10 are formed outward in the width direction. The side flaps 10 include dorsal side flaps 10A, 10A located on the dorsal side, ventral side flaps 10B, 10B located on the ventral side, and an inseam side flap 1.
It is divided into 0C and 10C.

[0020] The waist flaps 9, 9 may be provided with a waist elastic member stretched in the width direction to form gathers.

The side flaps 10, 10 are integrally formed by polymerizing the top sheet 2 and the back sheet 3, and it is preferable that the top sheet 2 and the back sheet 3 have substantially the same dimensions. One side may be formed long.

The crotch portion 6 is formed to be concave inward as a whole, but the side flaps 10C of the crotch portion 6 are formed to slightly protrude outward. Here, "outside" means a direction away from the longitudinal centerline of the main body 5.

[0023] A pair of tape fasteners 12 are arranged in parallel outwardly in the width direction of the absorbent body 4 on each of the left and right pair of back side side flaps 10A, 10A formed on the back side part 7, and when worn, the pair of tape fasteners 12 are arranged in parallel. A tape fastener 12 is fixed to a target tape 13 provided on the ventral side 7 of the backsheet 3.

A pair of elastic members 14, 14 are stretched in the longitudinal direction of the main body 5 from its proximal end to its terminal end, that is, over the dorsal side 7, crotch area 6, and ventral side 8. .

The pair of elastic members 14, 14 are arranged so as to protrude outward so that the distance between them is widest in the crotch region 6, and the distance between them is the shortest in the ventral region 8 and dorsal region 7. In addition, the elastic members 14, 14 overlap and are stretched over the absorbent body 4. In FIG. 1, by joining the side edges of the absorbent body 4 and the elastic members 14, 14, the contraction force of the elastic members 14, 14 is suppressed by the rigidity of the absorbent body in the region where the elastic members 14, 14 overlap with the absorbent body 4. The side flaps 10 of the crotch area 10C are contracted to form gathers. Although the elastic members 14, 14 have the ventral part 8 and the dorsal part 7 at different intervals from the crotch part 6, they may be arranged by displacing either the ventral part 8 or the dorsal part 7. .

By tensioning the pair of elastic members 14, 14 at symmetrical positions with respect to the longitudinal centerline of the main body 5, a good mounting condition and appearance can be obtained.

The shape of the recess formed in the crotch portion 6 is preferably such that it has constricted portions 6A, 6A at both ends thereof. These constricted portions 6A, 6A are formed by the elastic member 14.
, 14 in the width direction, making it easy to form the pocket portion. Furthermore, since the substantial effective depth of the recessed portion can be increased, the size of the diaper can be increased.

As shown in FIG. 3, the elastic members 14, 14 are preferably arranged between the intersections with the side edges of the absorbent body (between X and Y).
, and are arranged in a continuous extended state. Further, the elastic members 14, 14 are preferably arranged in a non-stretched state between the intersection point and the end portion A, and between the intersection point Y and the end portion B, and the elastic members 14, 14 are preferably arranged in a non-stretched state between the intersection point Y and the end portion B. 14, it is preferable to leave them in a non-stretched state. In this case, the elastic member 7 does not need to have a constant elongation rate. As a method of stretching such an elastic member only to a desired position and making it elastic, and arranging the rest as inelastic, there are two methods:
A method of controlling the elongation rate of the elastic member and arranging it; ■ A method of supplying and arranging an elastic member that has been intermittently elongated; There are various methods available, such as pre-cutting the adhesive in the area to be made inelastic, and applying a release agent to the adhesive in the area that is desired to be made inelastic, but any method known in the industry can be used.

Further, the elastic members 14, 14 and the back sheet 3 and top sheet 2 are joined by ultrasonic welding, thermal welding, adhesive bonding, or the like.

As each elastic member 14, 14 on both sides of the main body 5, three rubber threads are used in this embodiment. In this embodiment, it is preferable that the elongation rate of the inner thread rubber is higher than that of the outer thread rubber. By doing so, when the diaper is worn, the gathered portion assumes a planar shape and comes into close contact with the wearer's crotch area. In order to obtain a planar shape, other known inversion prevention means such as using an adhesive to suppress inversion of the gathered portion can be used. When such an inversion prevention means is used, the diaper can be put on quickly, and the gathered surface can be surface-adhered to the wearer's crotch to reliably and softly seal the inside.

[0031] When three-dimensional gathers are formed in the disposable diaper of this example, the leakage prevention effect is further improved. The three-dimensional gathers are formed by stretching from the outermost elastic member between the longitudinal center lines of the diaper symmetrically to the longitudinal center line of the diaper.

The elastic members 14, 14 are not limited to thread-like elastic members, but may also be tape-like elastic members or flat rubber. The material of the elastic member is particularly preferably one having a stress of 100 grams or less at 150% elongation, and elastic fibers capable of absorbing water and contracting may also be used.

Next, the operation of this embodiment will be explained.

When wearing the disposable diaper 1, the crotch section 6 is placed against the wearer's crotch, and the dorsal side flaps 10A are extended toward the ventral side. Next, the dorsal side flap 10C is overlapped with the ventral side flap 10B of the ventral part 8 on the waist side of the wearer, and each tape fastener 12 is attached at an arbitrary position on the ventral target tape 13.

In the state before the disposable diaper 1 is worn, as shown in FIG. 2, the elastic members 14 are arranged in a stretched state;
14 contracts in the longitudinal direction, and at this time, the main body 5 curves toward the top sheet 2 and deforms to fit the shape of the wearer. Further, since the elastic members 14, 14 are arranged in a curved manner, a contraction force acts also in the width direction. As a result,
The back part 7 and the ventral part 8 are contracted almost in line with the straight line connecting the side edges of the absorbent body 4, and a pocket part 16 is formed in a portion surrounded by the elastic members 14, 14 and the side edges of the absorbent body 4. Form.

That is, as shown in FIG. 3, in the unfolded state of the disposable diaper 1, the elastic members 14, 14 are subjected to a force that tends to move toward the straight line connecting the intersection points X and Y with the side edges of the absorbent body 4. F acts, and at the same time as the main body 5 curves, the side flaps 10C of the crotch section 6 stand up and move inside the main body 5, forming the pocket 16 shown in FIGS. 2 and 4. At this time,
In FIG. 3, the elastic member 7 at the straight line X, Y and the crotch area 6
If the dimension between the two is W2, this W2 becomes the amount of slack (depth) of the pocket 16. Therefore, the distance from the excretion point to the periphery can be increased compared to conventional diapers.

The pocket 16 protrudes outward when worn, and has the function of holding urine and feces excreted by the wearer. Part or all of the retained excrement is absorbed by the absorbent body 4 placed in the pocket 16. Therefore, this pocket 16 is effective even when excrement is not absorbed instantaneously, such as so-called sudden urine, because the excrement is retained in the pocket and gradually absorbed into the absorbent body.

Preferably, the pocket 16 is arranged to cover the evacuation point. Therefore, the pocket portion mainly containing urine is formed at the center of the crotch 6 for women, and near the ventral side 8 of the crotch 6 for men. The formation position of such a pocket 16 can be easily adjusted by changing the arrangement shape of the elastic member 7.

Next, another embodiment of the present invention will be described with reference to FIG.

Disposable diaper 2 according to the embodiment shown in FIG.
1 is different in that an auxiliary absorbent body 22 is provided between the absorbent body 4 and the elastic member 7 in the crotch area 6, and other parts are substantially the same as the above-mentioned embodiment, so the same parts , by assigning the same reference numerals, a detailed explanation of those parts will be omitted.

That is, disposable diaper 2 according to another embodiment
1, an auxiliary absorbent body 22 made of the same material as the absorbent body 4 is arranged between the absorbent body 4 and the elastic member 7 in the crotch area 6, and when the pocket 16 is formed, the auxiliary absorbent body 22 is placed on the wall of the pocket. This position improves the absorption efficiency of excrement and improves the leakage prevention effect.

A predetermined distance is provided between the auxiliary absorbent body 22 and the absorbent body 4, so that the auxiliary absorbent body 22 can move independently. Note that a slit is formed between the absorbent body 4 and the auxiliary absorbent body 22, so that the auxiliary absorbent body 22
It may also be something that ensures independent movement.

Furthermore, in the disposable diaper 21 of the other embodiment, the pocket 16 is difficult to collapse due to the rigidity of the auxiliary absorbent body 22, and even if the width of the absorbent body 4 in the crotch area 6 is made smaller, it can be formed to match the width of the crotch area. Even if it does, there is no need to worry about the absorption capacity decreasing.

[0044] The present invention is not limited to the above-mentioned embodiment;
Various modifications can be made without departing from the gist of the invention.

For example, although the elastic members are arranged one on each side along the longitudinal direction of the main body, the present invention is not limited to this, and a plurality of elastic members may be used.

[0046]

[Effects of the Invention] According to the absorbent article of the present invention, leakage of excrement can be prevented with a simple structure. According to the absorbent article of the present invention, the following effects are further exhibited. ■ By forming a pocket part in the crotch area that has excrement storage properties, fluid solids such as loose stool are stored in the pocket part and retained until the absorbent article is removed from the wearer. On the other hand, when sudden urine is not absorbed instantly, it is gradually absorbed into the absorbent body while being held in the pocket. ■In the crotch area, the elastic member is placed at a certain distance from the absorbent body, so it is not affected by the rigidity of the absorbent body and allows the absorbent article to fit according to the wearer's movements. Can be done. Moreover, in the waist region, it can be made to fit snugly to the wearer's body. ■Even if the absorbent body is shaped like an hourglass with a narrow width at the crotch area to match the wearer's crotch width, a sufficient distance from the excretion point to the gathers can be maintained. ■As it is a flat type absorbent article, it is not bulky and looks beautiful when worn. ■Since it is a flat type absorbent article that does not require any special processing technology during the production process, it is excellent for high-speed production and can have stable folded dimensions even during high-speed operation. If the folding shape is good, the product can be easily packaged during the interior packaging and packaging processes, and the product will look good when displayed in stores.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an unfolded state of a disposable diaper according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the disposable diaper shown in FIG. 1 in its natural state.

3 is a plan view illustrating the operation of the disposable diaper shown in FIG. 1. FIG.

FIG. 4 is a sectional view showing the disposable diaper shown in FIG. 1 in a worn state.

FIG. 5 is a plan view showing an unfolded state of a disposable diaper according to another embodiment of the present invention.

FIG. 6 is a plan view showing a conventional disposable diaper in an unfolded state.

[Explanation of symbols]

1, 21 Disposable diapers 2 Top sheet 3 Back sheet 4 Absorber 6 Lower crotch 7. Dorsal part 8 Ventral part 14 Elastic member

Claims (6)

[Claims] Claim 1: A main body having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body located between these two sheets, the main body being attached to the wearer's crotch when worn. The crotch area is located at the crotch area, and the ventral area is located at the ventral side.
The absorbent article is divided into a dorsal part located on the dorsal side, and a pair of elastic members is provided on both sides in the longitudinal direction of the main body, spanning the ventral part, the crotch area, and the dorsal part. What is claimed is: 1. An absorbent article, characterized in that the pair of elastic members are stretched at a wider interval in the crotch region than in the ventral and dorsal regions. 2. The main body includes side flaps extending outward in the width direction from both longitudinal edges of the absorbent body, and the side flaps are formed in an outwardly convex shape in the crotch area. The absorbent article according to claim 1, characterized in that: 3. The elastic member according to claim 1 or 2, wherein the elastic member is stretched over the absorbent body at the ventral side portion and the dorsal side portion of the main body. Absorbent articles. 4. The pair of elastic members each include a plurality of linear elastic bodies, and each of the linear elastic bodies has a different elongation rate. absorbent articles. 5. The absorbent body according to claim 1, wherein the crotch portion is narrower than the ventral and dorsal portions.
The absorbent article according to any one of claims 1 to 4. 6. The absorbent article according to claim 1, wherein an auxiliary absorbent body is provided between the absorbent body and the elastic member in the crotch area. .