JP3356420B2 - 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 an absorbent article, and more particularly to an absorbent article such as a disposable diaper used for infants, adults and incontinent persons.

[0002]

2. Description of the Related Art Conventional absorbent articles such as disposable diapers include a liquid-permeable top sheet and a liquid-impermeable back sheet, as disclosed in Japanese Patent Publication No. 52-40267. A diaper main body is constituted from the absorbent body located between the two sheets of the diaper main body, a stretchable elastic member is disposed on a side flap extending left and right of the diaper main body to form a gather, and a back side of the side flap is formed. A so-called flat type diaper is generally used to improve fitting and leak-proofing by disposing fasteners on both side edges so as to be adjustable. Further, JP-A-62-2502
As disclosed in Japanese Patent Application Publication No. 01-001, there has been known one in which the gathers of the leg portions are made three-dimensional, and the flap portion around the absorber is made water-repellent to enhance the leak-proof effect.

Recently, however, as disclosed in Japanese Patent Application Laid-Open No. 57-77304, the abdominal region and the dorsal region of a pair of left and right side flaps have been designed to improve fit and fit. A so-called pants-type disposable diaper has been proposed in which a pair of left and right leg openings and a waist opening are respectively formed by bonding and fixing. The pants-type disposable diaper is configured such that a leg opening and a waist opening are formed to be extendable and contractable, respectively, to fit a body shape. Such pants-type disposable diapers can usually be worn by the wearer in an upright position, and can be used for toilet training to promote the infant's "diaper detachment", or for incontinent persons or people who have difficulty walking. It is considered useful for possible adults.

[0004]

However, in the above-mentioned conventional underpants-type disposable diaper, the crotch must be formed narrow, so that the elastic member cannot be arranged separately from the absorber. As a result, it was difficult to exhibit the original elastic properties due to the influence of the rigidity of the absorber. At the same time, wrinkles and gaps are apt to occur at the joints at both side edges due to the elastic members, which has caused the excrement to leak. In addition, three-dimensional leg gathers, which are effective as leak prevention measures, also have problems in that the crotch is narrow and there is difficulty in manufacturing.

[0005] The water-repellent surrounding technique, which is effective as a measure for preventing leakage of excrement, particularly urine, is also used in pants-type diapers. Since it could not be formed, a sufficient effect could not be exhibited. Furthermore, in the conventional method of manufacturing a pants-type diaper, it was impossible to provide a water-repellent portion in a waist portion for transportation.

[0006] Further, the conventional disposable diaper absorbs and retains excretion only in the vicinity of the urination point.
Since only such a portion is soiled and other portions, for example, the side of the waist, are substantially not soiled, discarding the entire diaper is wasteful and uneconomical. Accordingly, an object of the present invention is to provide an absorbent article that can effectively prevent excrement leakage.

Another object of the present invention is to provide an absorbent article that can replace only a stained portion with excrement.

[0008]

According to the present invention, there is provided an absorbent body having a liquid-permeable top sheet, a back sheet opposed thereto, and an absorber disposed between the two sheets.
And in the absorbent article having a water-repellent outermost layer sheet in which the absorbent body is joined and surrounds the wearer's waist when worn and the absorbent body is held against the wearer, the shape of the absorber is It has an hourglass type or a T-shape having a central concave portion, and the central concave portion has elastic members stretched on both sides in the longitudinal direction of the absorber, and the back sheet has
Only in the center region in the width direction of the absorbent main body, the absorbent body is adhered to the outermost layer sheet. Form the leg opening and the outermost
Between the waist opening and leg opening of the layer sheet,
Stretching a number of elastic members to form waist gathers
The waist opening and the leg opening of the outermost layer sheet
A plurality of elastic members are stretched over the mouth, respectively.
To form waist gathers and leg gathers
The outermost layer sheet has air permeability and the back sheet
The above object has been achieved by providing an absorbent article, which is a liquid-impermeable sheet having moisture permeability .

Further, the present invention provides an absorbent body having a liquid-permeable top sheet, a back sheet opposed thereto, and an absorber disposed between the two sheets, and the absorbent body is joined. In an absorbent article having a water-repellent outermost layer sheet that surrounds the wearer's waist when worn and holds the absorbent body against the wearer, the shape of the absorber has a central recess, an hourglass type or An elastic material is stretched on both sides in the longitudinal direction of the absorber in the central concave portion, and the back sheet has a T-shape only in the central region in the width direction of the absorbent body. is bonded to the outermost layer sheet, the central recess of the absorbent body, Yes erected the crotch portion gathers state, and are the 20mm or more standing設高of crotch lower gathers, waist of the outermost layer sheet
Between the opening and the leg opening, a plurality of elastic members
It is stretched to form waist gathers.
At the waist and leg openings of the
A number of elastic members are stretched and each waist gathers
And the outermost layer sheet forming a leg gather
Has air permeability, and the back sheet has a liquid permeability.
By providing an absorbent article characterized by impermeable sheet der Rukoto it is obtained by achieving the above object.

[0010]

[0011]

[0012]

According to the absorbent article of the present invention, since the bonding portions of the main absorber and the outermost layer sheet is only the central region in the width direction of the absorbent body, expansion and contraction of the elastic member (also referred to as elastic member) In some cases, the influence of the rigidity of the absorber is reduced, and the formation of a crotch gather for preventing leakage can be facilitated. In addition ,
In the case of the light absorbent article, if the absorbent body is detachably joined from the outermost sheet, after excretion, a new absorbent body for replacement is fixed to the portion of the outermost sheet and the outermost sheet is reused. It is possible to

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following explanation
The examples shown in FIGS. 1 to 4 are reference examples of the present invention,
Examples shown in FIGS. 5 to 8 are embodiments of the present invention. At the beginning,
A reference example of the present invention will be described with reference to FIGS.

FIG. 1 is a perspective view of a disposable diaper according to a reference example of the present invention, FIG. 2 is a partially cutaway plan view of the disposable diaper shown in FIG. 1 in an unfolded state, and FIG. Sectional view taken along the line III, FIG.
FIG. 4 is a cross-sectional view of the disposable diaper shown in FIG. 1 taken along the line IV-IV. The disposable diaper 1 as an absorbent article according to the reference example of the present invention is a so-called pants-type disposable diaper, and as shown in FIG. 1, a liquid-permeable top sheet 15 and a back sheet 16 opposed thereto, An absorbent body 3 having an absorbent body 17 disposed between the two sheets; and a repellent for joining the absorbent body 3 and surrounding the waist of the wearer during wearing to hold the absorbent body to the wearer. A water-borne outermost sheet 2 is provided, and the waist opening 11 and a pair of the waist opening 11 are fixed by joining and fixing both side edges of the ventral part located on the ventral side and the dorsal part located on the dorsal side of the outermost layer sheet 2. a disposable diaper formed with the leg-opening 7, 7, to form at least the number of telescopic elastic member leg-opening 7 and 7 of the outermost layer sheet 2 (third elastic member) 13 by leg gathers 13a A.

The outermost layer sheet 2 is formed in a substantially quadrangular shape having a size substantially larger than that of the absorbent main body 3, and the absorbent main body 3 is detachably fixed to the substantially central portion in the longitudinal direction thereof with an adhesive A. I have. A concave notch 6 is formed on both sides to which the absorbent main body 3 is adhered, so that the leg openings 7 are formed when the pants type is formed. A pair of left and right side flaps 8, 8, 9, 9 extend outward from the both sides of the absorbent main body 3 in the width direction above and below the constricted portion where the concave notch 6 is formed. ing.

The respective edges of the side flaps 8, 8, 9 and 9 are adapted to fuse the upper and lower side flaps 8 and 9 together at a joint to form a pants-type. In addition, a pair of waist flaps 1 extending outward from the absorbent main body 3 are provided on the edge portions of the outermost layer sheet 2 in the longitudinal direction.
0a and 10b are provided, and when the pants type is formed, the waist opening 11 is formed. Each of the waist flaps 10a and 10b has a plurality of elastic
Member (second elastic member) 12 is, in the concave portion 6 of the side flaps are stretched third elastic members 13, waist gathers 12a of each waist flap, leg Re'
Grayed gathers 13a is formed to enhance the fit of the wearer when worn, slipping prevention is achieved. Further, a plurality of elastic members ( fourth elastic member ) 14 are stretched between the waist opening 11 and the leg openings 7 when wearing the waist opening 11 to form waist gathers , and the fit of the wearer around the waist is formed . Is to increase.

The absorbent main body 3 is arranged so as to be located inside the third elastic member 13 stretched in the concave portion 6 when the absorbent main body 3 is adhered to the outermost layer sheet 2, and has a leg gather 13a and a crotch gather. 5 are sequentially formed without overlapping. The absorbent main body 3 includes a liquid-permeable top sheet 15 that forms a side in contact with the wearer's skin, a liquid-impermeable back sheet 16 corresponding to the top sheet 15, a top sheet 15, and a back sheet 16. And an absorber 17 interposed therebetween. The absorbent main body 3 has a pair of left and right main body flaps 18, 18 extending outward in the width direction from both side edges of the absorber 17, and the main body flap 1.
The first elastic members 4, 4 described above are stretched along the longitudinal direction of the absorbent main body 3 so as to form crotch gathers 5 on both side edges of 8, 18.

The main body flaps 18 are free ends, and the absorbent main body 3 has only a substantially central portion of the back sheet 16 adhered to the bottom surface thereof, so that the inseam gathers 5 are formed.
Facilitates formation. The top sheet 15 is preferably a liquid-permeable sheet that allows excrement to pass through the absorber 17 and has a feeling similar to underwear. Examples of such a liquid-permeable sheet include a woven fabric, a nonwoven fabric, and a porous film. Are preferred. Also, a method of applying a hydrophobic compound such as a silicone oil agent or paraffin wax to the periphery of the top sheet 15 or a method of applying a hydrophilic compound such as an alkyl phosphate ester in advance and washing the periphery with warm water are used. By performing water treatment, it is possible to prevent leakage due to bleeding of urine and the like in the peripheral portion.

The back sheet 16 is made of a moisture-permeable liquid-impermeable sheet that has been stretched by adding a filler to a thermoplastic resin .
For example, a composite material having a feeling close to that of underwear, for example, a composite material of a film and a nonwoven fabric or a composite material of a film and a woven fabric is used. The absorbent 17 is preferably composed mainly of fibrillated pulp and used in combination with a high-molecular-weight water-absorbing polymer, and is also preferably one obtained by heat-treating a mixture of a thermoplastic resin, cellulose fiber and a high-molecular-weight water-absorbing polymer. The location of the high-molecular-weight water-absorbing polymer may be any of the upper layer, the middle layer, and the lower layer, and may be a mixture with pulp. The high-molecular water-absorbing polymer has a retaining performance of absorbing and holding a liquid 20 times or more its own weight, and is preferably in the form of particles having a gelling property. For example, a starch-acrylic acid (salt) graft copolymer, a starch-acrylonitrile acid (salt) polymer and the like are preferable. The shape of the absorber 17 is preferably an hourglass shape that matches the body shape of the wearer, but may be rectangular.

The outermost layer sheet 2 is preferably a liquid-impermeable, air-permeable, highly flexible sheet having a feeling similar to underwear, and such a sheet is subjected to a water-repellent treatment. Woven fabrics and non-woven fabrics can be used. In particular, one or both sides of a liquid-impermeable film laminated with a nonwoven fabric are excellent in the feel, the function of preventing leakage due to bleeding of urine, etc.
Particularly preferred.

First, second, third and fourth elastic members 4, 1
2, 13, 14 are generally the absorbent body 3 in the extended state.
The outermost layer sheet 2 is bonded to the outermost layer sheet 2 by means known in the art such as ultrasonic welding, heat welding, and an adhesive. As the material,
Yarn rubber, flat rubber, such as foamed polyurethane film type of rubber or tape-like, anything Ru can be used as long as it is known in the industry. Such an elastic member is 15
Those having a stress at 0% elongation of 70 to 100 g are particularly preferred.

As the adhesive A, a known adhesive which can be peeled off is used, and is adhered in a dot-like or linear manner inside the absorbent main body 3, preferably inside the absorber 17. As the material of the adhesive A, hot melt adhesive, styrene
Butadiene copolymer, acrylate copolymer, vinyl acetate, ethylene / olefin copolymer, petroleum resin, cold glue and the like are used.

Next, the operation of the reference example will be described. Pants type in which the side edges of the side flaps 8 and 9 of the outermost layer sheet 2 in the unfolded state shown in FIG. 2 are joined to each other to form a waist opening 11 and a pair of leg openings 7 and 7 as shown in FIG. Form a diaper. An absorbent main body 3 is adhered to the innermost surface of the outermost layer sheet 2 by an adhesive A so as to be releasable.

At the time of wearing, the pants-type diaper is pulled up by passing both feet through the waist opening 11, and the legs are worn through the leg openings 7,7. During the wearing, gathers are formed at the waist opening 11 and the leg openings 7, 7 of the outermost layer sheet 2 , so that the fitting to the wearer, the followability, and the leakage prevention are achieved. Further, the fit of the fourth elastic member 14 to the wearer around the waist is improved.

During wear, crotch gathers 5 are formed in the absorbent body 3 so that excretions and the like can be removed.
From the outermost layer sheet 2 is prevented. Further, since the double gathers are formed together with the leg gathers of the leg openings 7, 7 of the outermost layer sheet 2, the leakage is reliably prevented from the legs. Then, after excretion of excrement, the absorbent main body 3 is peeled off from the outermost layer sheet 2 and a new absorbent main body 3 is attached to the outermost layer sheet 2 with an adhesive A.
And replace it. As described above, according to the reference example, it is possible to easily replace only the absorbent main body that is contaminated with excrement.

Next, referring to FIGS. 5 to 7 of the accompanying drawings,
A first embodiment of the present invention will be described. In the first embodiment, the same parts as those of the above-described reference example are denoted by the same reference numerals, and a detailed description of those parts will be omitted. 5 is a plan view of the disposable diaper according to the first embodiment of the present invention , FIG. 6 is a sectional view of the disposable diaper shown in FIG. 5 taken along the line VI-VI, and FIG.
It is sectional drawing cut | disconnected along the VII-VII line.

As shown in FIG. 6, a disposable diaper 1 as an absorbent article according to the first embodiment is disposed between a liquid-permeable top sheet 15, a back sheet 16 opposed thereto, and these two sheets. A disposable diaper 1 comprising an absorbent body 3 having an absorbent body 17 and a water-repellent outermost layer sheet 2 that surrounds the waist of the wearer when worn and holds the absorbent body against the wearer, The shape of the absorber 17 is an hourglass or a T-shape having a central recess 6, and the elastic member 4 is stretched in the central recess 6 of the absorber along the longitudinal direction of the absorber 17. and, and, the backsheet only in the central region 25 in the width direction of the absorbent main body 3, is adhered to the outermost layer sheet 22
You .

[0028] More specifically the above-described configuration, above the outermost sheet 2, ginseng Reference Example as well as waist flap 10a,
10b, side flaps 8, 8, 9, 9 and a central concave portion 6 are stretched and stretched elastic members (not shown), and are the same as in the reference example.
Each gather is formed in the same manner. As shown in FIG. 5, in the first embodiment, the absorber 17 disposed in the absorbent main body 3 is formed in a substantially hourglass shape in which the center is recessed corresponding to the central recess 6. The hourglass shape is a different hourglass shape from the reference example.

Further, as shown in FIG.
At the time of wearing, the crotch gathers 5 are erected, and the erected height H is preferably 20 mm or more, more preferably 20 mm to 50 mm. If it is less than 20 mm, the fit to the wearer's leg is not sufficient, and a three-dimensional gather that is sufficient to hold the excrement cannot be obtained.

The elastic members 4 are stretched on both sides of the absorber 17 in the longitudinal direction, are arranged from once to the other end of the absorber 17, and extend over a wide area around the legs at the crotch of the wearer. To form inseam gathers. In the first embodiment, the adhesive A is applied only to the central region 25 substantially at the center of the absorbent main body 3 in the width direction, and adheres the back sheet 16 and the outermost layer sheet 2 of the absorbent main body 3. However, the central region 25 may be applied in a planar shape so as to fill the entirety such as a square or a circle, or may be applied linearly along a circular or square outline. By applying the adhesive A in this manner, not only the body flaps 18 and 18 to which the adhesive A is not applied but also the absorber 17
Is also raised by the elastic member 4, which is effective in improving the fit and preventing side leakage. The position of the central region 25 to which the adhesive A is applied depends on the position of the absorbent main body 3.
There is no particular limitation on the longitudinal direction of the absorbent body 3.
Is preferably at least 20 mm shorter than the minimum width of the absorber. That is, it is preferable to apply at a position having a distance of 10 mm or more from each of the left and right side edges in the minimum width portion of the absorbent body 3. By applying to such a position, at least 10 mm left and right of the side edge of the absorber can be erected.

As the adhesive A, the same adhesive as that of the above-mentioned reference example is used. According to the first embodiment, by applying and bonding the adhesive A only to the central region 25, the influence of the rigidity of the absorber 17 is reduced, and the crotch gather 5 of the absorbent main body 3 is in a three-dimensional state during use. Thus, it fits well to the wearer, and the liquid leakage from the crotch gather 5 can be reliably prevented. Furthermore, the bonding point is located in the central region
Since it is the narrow range of only 5, the outermost layer sheet 2 of the absorbent main body 3 can be easily peeled off.

Incidentally, the disposable diaper 1 according to the first embodiment.
May be a pants type as in the above-described reference example, or a so-called flat type which is fastened with a fastener tape. Next, the referring to FIG 2
An example will be described. FIG. 8 is a plan view showing a main part of the disposable diaper according to the second embodiment of the present invention. This second embodiment is the same as the first embodiment except that the shape of the absorber 17 is different. The same portions as those in the first embodiment are denoted by the same reference numerals, and detailed description of those portions will be omitted.

That is, in the second embodiment, the shape of the absorber 17 is formed in a substantially T-shape, the area of the absorber at the wearer's abdomen is increased, and the absorption amount at the abdomen is increased. It was done. According to the second embodiment, the minimum necessary absorber 1
7, leakage can be effectively prevented. The present invention is not limited to the embodiments described above, and can be variously modified without departing from the gist of the present invention.

For example, in the reference example described above, the elastic members are not arranged on both side edges of the outermost layer sheet 2, but the first elastic member 4 is arranged on the absorbent main body 3, and the crotch gathers 5 are formed.
May be formed .

In the first and second embodiments, the adhesive A
It has been applied only to one place in the central region in the width direction, if the central region in the width direction, or may be applied in a plurality of locations. Further, in the first and second embodiments, both side edges of the abdominal portion and the back portion of the outermost layer sheet 2 are joined and fixed, and the waist opening and the pair of legs are similar to the reference example. A so-called pants-type disposable diaper having an opening formed therein can also be used. And
In the case of a pants-type disposable diaper like this,
It is desirable to form a waist gather and a leg gather by disposing elastic members at the waist opening and the leg opening, respectively.

[0036]

According to the absorbent article of the present invention, it is possible to effectively prevent excretion from leaking and to replace only the stained portion with excrement.

[Brief description of the drawings]

FIG. 1 is a perspective view of a disposable diaper according to a reference example of the present invention.

FIG. 2 is a partially cutaway plan view of the disposable diaper shown in FIG. 1 in a developed state.

FIG. 3 is a sectional view of the disposable diaper shown in FIG. 1 taken along the line III-III.

FIG. 4 is a cross-sectional view of the disposable diaper shown in FIG. 1 taken along line IV-IV.

FIG. 5 is a plan view of the disposable diaper according to the first embodiment of the present invention.

FIG. 6 is a cross-sectional view of the disposable diaper shown in FIG. 5 taken along line VI-VI.

7 is a cross-sectional view of the disposable diaper shown in FIG. 5 taken along line VII-VII.

FIG. 8 is a plan view showing a main part of a disposable diaper according to a second embodiment of the present invention.

[Explanation of symbols]

1 disposable diaper 2 outermost sheet 3 absorbent body 4 first elastic member (elastic member) 5 crotch gathers 6 central recess 12 second elastic member (stretchable elastic member) 12a waist gather 13 third elastic member (elastic elastic member) 13a Leg gather 14 Fourth elastic member (stretchable elastic member) 15 Top sheet 16 Back sheet 17 Absorber A Adhesive 25 Central region

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-162001 (JP, A) JP-A-1-246402 (JP, A) JP-A-59-76903 (JP, A) JP-A-60-1985 194947 (JP, A) JP-A 1-125311 (JP, U) JP-A 61-142805 (JP, U) Patent 3187110 (JP, B2) Patent 2340331 (JP, B2) , A) (58) Field surveyed (Int. Cl. ⁷ , DB name) A61F 13/15 A61F 5/44

Claims (4)

(57) [Claims] 1. An absorbent body having a liquid-permeable top sheet, a back sheet opposed thereto, and an absorber disposed between the two sheets, and a wearer to which the absorbent body is joined and worn when worn. An absorbent article provided with a water-repellent outermost layer sheet that surrounds the waist and holds the absorbent body against a wearer, wherein the shape of the absorber is an hourglass or T-shaped having a central concave portion. In the central concave portion, an elastic material is stretched on both sides in the longitudinal direction of the absorber, and the back sheet is formed on the outermost layer sheet only in the central region in the width direction of the absorbent main body. are bonded, the both side edge portions of the respective ventral and dorsal sides of the outermost sheet and fixedly joined to form a waist opening and a pair of leg openings, a waist opening of the outermost layer sheet Leg opening Of
In between, stretchable elastic members are stretched to create waist gathers.
Formed and, waist opening and the leg openings of the outermost layer sheet
A plurality of stretchable elastic members
The outermost layer sheet has air permeability, and the back sheet has a moisture-permeable liquid-impermeable sheet , forming an est gather and a leg gather.
Absorbent article characterized in that it. 2. An absorbent body having a liquid-permeable top sheet, a back sheet opposed thereto, and an absorber disposed between the two sheets, and a wearer to which the absorbent body is joined and worn when worn. An absorbent article provided with a water-repellent outermost layer sheet that surrounds the waist and holds the absorbent body against a wearer, wherein the shape of the absorber is an hourglass or T-shaped having a central concave portion. In the central concave portion, an elastic material is stretched on both sides in the longitudinal direction of the absorber, and the back sheet is formed on the outermost layer sheet only in the central region in the width direction of the absorbent main body. A crotch gather is erected in the central concave portion of the absorbent body, and the crotch gather has an erect height of 20 mm or more.
Between the waist opening and the leg opening of the outermost layer sheet.
In between, stretchable elastic members are stretched to create waist gathers.
Formed and, waist opening and the leg openings of the outermost layer sheet
A plurality of stretchable elastic members
The outermost layer sheet has air permeability, and the back sheet has a moisture-permeable liquid-impermeable sheet , forming an est gather and a leg gather.
The absorbent article according to claim der Rukoto. 3. The waist opening and a pair of leg openings formed by joining and fixing both side edges of the abdominal side and the back side of the outermost layer sheet.
The absorbent article according to Item. 4. The absorbent article according to claim 1, wherein the absorbent main body is detachable from the outermost layer sheet.