JPH10243961A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a wearing feeling and a leakage preventing effect by arranging a distance between elastic members around left and right legs positioned in the most inner sides of a back side part and a belly side part so as to make the back side part wider than the belly side part and also arranging a part of the intermediate parts of the around-leg elastic members by means of bending them outwards. SOLUTION: In a disposable diaper where an absorbing body 3 is arranged between a liquid permeable front surface sheet 1 and a liquid impermeable rear surface sheet 2, an around-waist elastic member 4 is arranged in an extension state between the both the sheets 1 and 2. Then, the around-leg elastic members 6 are arranged in the extension state in side flap parts and are constituted of belly side most inner parts 6c and 6c', back side most inner parts 6d and 6d' and bending parts 6e and 6e' which are arranged by bending outwards against a straight line connecting the belly side and back side most inner parts 6c and 6d. Besides, the distance between the left and right most inner parts 6d and 6d' at the back side is formed to be longer than that between the left and right most inner parts 6c and 6c' at the belly side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD [0001] The present invention is excellent in wearing feeling,
The present invention relates to a disposable diaper that has a high leakage prevention effect and is preferably used.

[0002]

2. Description of the Related Art Conventionally, a disposable diaper is provided with an elastic member around a leg. Generally, the elastic member is fixed to at least one of the top sheet and the back sheet in an extended state with an adhesive.

Conventionally, the elastic members around the legs of a disposable diaper that have been proposed and put to practical use are arranged in the crotch portion in parallel with the longitudinal direction of the disposable diaper or have a narrow width at the crotch portion. It is arranged to be curved inward in order to make.
However, in any case, there is little space between the absorber and the elastic member around the leg, the elastic member around the leg cannot completely follow the movement of the wearer, and a gap is generated between the diaper and the wearer, causing a leak. There was a problem of becoming. In addition, when excretion is excreted at a speed higher than the absorption rate of the absorber, there is another problem that the excrement immediately leaks past the elastic member around the leg. Furthermore, since the size of the leg circumference is almost determined by the size of the arc-shaped part of the diaper used, it is not possible to accommodate wearers of various thicknesses around the leg. there were.

[0004] To cope with these problems, an absorbent article has been disclosed in which elastic members around the legs are arranged at a wider interval at the crotch than at the back and the abdomen (Japanese Patent Laid-Open No. 4-2426).
No. 45). This absorbent article forms a pocket in the crotch when worn to prevent leakage at the crotch. However, since the elastic member is arranged in the same manner on the back side and the abdomen, the absorbent article is not attached so as to wrap the buttocks of the wearer and the fit is poor, and for the same reason, the back side Since the space between the absorbent article and the wearer in the part is small, there was a problem that loose stool and the like could not be accommodated and leaked.

[0005]

DISCLOSURE OF THE INVENTION In view of the above situation, the present inventors have developed a disposable diaper in which an elastic member is attached to the leg circumference to define the size of the opening around the leg. It was concluded that it was necessary for the leg-surrounding elastic member to have an appropriate width between the crotch portion and the absorbent body, while the arc-shaped portion was sufficiently formed.
Also, in order to enhance the fit to the wearer and to further enhance the effect of preventing leakage from the back side, it is necessary to dispose the elastic members around the legs wider on the back side than on the abdomen. I came to the conclusion. An object of the present invention is to provide a disposable diaper that is excellent in wearing feeling, has a high leakage prevention effect, and is preferably used.

[0006]

Means for Solving the Problems The present invention includes an absorbent main body having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between these two sheets, Absorbent body is divided into a crotch positioned at the crotch of the wearer when worn, an abdomen positioned at the abdomen, and a dorsal portion positioned at the back, on both sides in the width direction of the absorbent body. Is
In the disposable diaper in which a pair of left and right elastic members are arranged in an extended state from the abdomen to the crotch and the back, the pair of left and right elastic members are located at the innermost side in the back. The distance between the left and right parts is arranged wider than the distance between the left and right parts located on the innermost side of the abdominal part, and two points located on the innermost sides of the back part and the abdominal part of the elastic member. A disposable diaper characterized in that a part of an intermediate portion of the elastic member is arranged to be curved outward with respect to a straight line to be connected.

[0007] In the disposable diaper according to the present invention having the above-described structure, the distance between the innermost leg-around elastic members located on the back side and the abdomen is wider on the back side than on the abdomen. Because it is arranged, it is used to wrap the wearer's buttocks in the back part, so that the diaper fits the wearer, and it is excellent in wearing feeling, and the back part of the elastic member around the leg and the ventral side A part of the middle part is curved outward with respect to the straight line connecting the two points located at the innermost part of the part, so that there is room for the sheet between the absorber and the elastic member around the leg. Is formed so that the leg-surrounding-portion elastic member can easily follow the movement of the wearer, thereby preventing leakage without creating a gap between the diaper and the wearer.

[0008] Further, since the allowance of the sheet between the absorber and the elastic member around the leg is formed from the crotch part to the back part, the diaper can be used with the wearer with the butt wrapped. A space is formed between them, and even when loose stool is excreted, the loose stool is temporarily held to prevent the loose stool leaking from the absorber from immediately passing over the elastic member around the leg. In addition, the straight line connecting the two innermost points on the dorsal and ventral parts with the diaper expanded,
The leg-surrounding elastic member disposed to be curved outwardly enters the inside when worn by the wearer, and forms a substantially larger leg-surrounding opening, so that it is possible to cope with wearers around legs with various thicknesses. .

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The surface sheet used in the present invention is a hydrophilic or hydrophobic nonwoven fabric, woven fabric, porous plastic film, or the like, and its constituent fibers are polypropylene, polyethylene, polyester, nylon or Composite fibers composed of two or more components such as polyester, polypropylene, polyethylene and nylon may be used. In particular, polyester / polyester, polyester / polyethylene, and polypropylene / polyethylene composite fibers are preferred from the viewpoint of strength, but are particularly limited. is not.

The top sheet does not need to be composed of a single sheet, but may be composed of a plurality of sheets, such as replacing the sheet with the upper surface of the absorber and the side flaps. When the top sheet is composed of a plurality of sheets, each sheet may be made of a different material, or may be made of the same material.

The back sheet used in the present invention is:
A liquid-impermeable film such as polyethylene, a material for bonding a liquid-impermeable film to a nonwoven fabric, a material for bonding a liquid-impermeable film to a woven fabric, and the like, and is preferably a material having air permeability or moisture permeability. is there.

The absorbent used in the present invention is made of cotton pulp, SAP, hydrophilic sheet, etc., and is not particularly limited. Also, the absorber is made from a known absorbent material commonly used in conventional disposable diapers and other absorbent articles. That is, it is formed of a single-layer or multi-layer mat made of absorbent fibers such as cotton-like pulp and rayon, and is wrapped with a hydrophilic sheet. The SAPs are uniformly mixed in each mat or are arranged in layers between the mats. Alternatively, 3 to 60% by weight of a heat-fusible substance may be mixed with the cotton-like pulp and thermocompression-bonded. Alternatively, only the SAP may be wrapped by the hydrophilic sheet.

As the cotton-like pulp, a chemical pulp sheet or a pulp sheet obtained by defibrating a mechanical pulp sheet with a crusher and having a fiber length of 5 mm or less is used. The pulp raw material is not limited to softwoods, but hardwoods, straws, bamboos, and kenafs are also applicable. The amount of the pulp used varies depending on the intended absorber, for example, depending on whether the pulp is used alone, a plurality of layers are used, or another absorbent is used in combination. It is in m ^2.

The SAP includes starch, cellulose, and synthetic polymer. That is, starch-acrylic acid (salt) graft copolymer, saponified starch-ethyl acrylate graft copolymer, starch-
Saponified product of methyl methacrylate graft copolymer, starch-acrylonitrile graft copolymer, saponified starch-acrylamide graft copolymer,
Starch-acrylonitrile-2-acrylamide-2
-Saponified methylpropanesulfonic acid graft copolymer, acrylic acid (salt) polymer, polyethylene oxide crosslinked with acrylic acid, crosslinked product of sodium carboxymethyl cellulose, crosslinked product of polyvinyl alcohol-maleic anhydride reactant And so on. It absorbs urine, body fluid, and water at least 20 times its own weight, and sodium polyacrylate is most suitable from the viewpoint of absorption performance. S
The distribution amount of AP was 10% of the total weight of the dry floc pulp.
５００500% by weight, preferably 15-300% by weight, such amounts of SAP being substantially uniformly distributed in the floc. When the SAP absorbs and swells, the particles have minimal interference with each other, are less likely to form continuous permeation barriers, and penetrate and absorb urine and bodily fluids in three dimensions.

The hydrophilic sheet may be any hydrophilic sheet such as a tissue, an absorbent paper, a hydrophilic nonwoven fabric, or the like. As a method of compressing the absorber, the surface of the absorber may be compressed by a roll or the like having a smooth peripheral surface so that the density of the absorber is continuous to be substantially uniform throughout the entire surface, or the peripheral surface may be uneven. Depending on a certain roll or the like, the density of the absorber may be partially different, and the absorbent may be compressed so as to be embossed in a pattern arrangement for guiding urine and body fluid in the vertical and oblique directions. In the case of embossing, the compression section and the non-compression section may be continuous or discontinuous.

A diffusion layer may be provided on at least a part of the absorber. By providing the diffusion layer, even if the space under the topsheet is not sufficiently provided due to the posture of the wearer,
It is possible to prevent leakage of urine, body fluid, and the like without reducing the absorption rate of urine, body fluid, and the like.

The diffusion layer is a hydrophilic liquid-permeable nonwoven fabric, woven fabric, porous plastic, flocculent pulp, or the like, and its component may be polypropylene, polyethylene, polyester, rayon, pulp, or a composite fiber thereof. There is no particular limitation. The diffusion layer is provided between the topsheet and the absorber, and is fixed to the absorber with an adhesive or the like.

In the present invention, it is preferable to arrange a three-dimensional gather on the side of the absorber. Solid gathers
Although it may be formed of a three-dimensional gather sheet and a stretchable elastic body, it may be formed of a stretchable sheet, and may be arranged on the absorber side only one set, or may be arranged in a plurality of sets, particularly Not limited.

The material of the three-dimensional gather sheet is a hydrophilic or hydrophobic nonwoven fabric, woven fabric, porous plastic film or the like, or a liquid-impermeable film, or a laminate of these materials. May be a single fiber such as polypropylene, polyethylene, polyester, or nylon, or a composite fiber composed of two or more components such as polyester, polypropylene, polyethylene, or nylon. In particular, polyester / polyester, polyester / polyethylene, polypropylene / Polyethylene composite fibers are preferred from the viewpoint of strength, but are not particularly limited.

As the elastic member, a thread-like, cord-like, or flat-shaped elastic material such as natural rubber, synthetic rubber, or urethane is used according to the installation position. The disposition of the elastic member is performed by fixing the elastic member to the sheet.

As the bonding method, a hot-melt, starch-based or water-soluble glue such as CMC (carboxymethylcellulose), a highly fluid adhesive, or welding by heat or ultrasonic waves may be used.

[0022]

Hereinafter, the absorbent article of the present invention will be described in detail with reference to the drawings, taking a disposable diaper as an example, but the present invention is not limited to these. FIG. 1 is an exploded plan view of a disposable diaper according to the present invention, with a portion cut away. In FIG. 1, the absorbent article 3 is disposed between a liquid-permeable top sheet 1 and a liquid-impermeable back sheet 2 of the disposable diaper. The top sheet 1 and the back sheet 2 are laminated such that the top sheet 1 is superimposed on the back sheet 2, and the whole is adhered so as to be integral with each other on the outer periphery (periphery), and includes the absorber 3. Outside the both sides in the width direction of the absorber 3, the front and back double-sided sheets are extended to form side flaps on both sides.

Between the top sheet 1 and the back sheet 2 forming the back flap portion, in order to improve the fit to the waist of the wearer and prevent leakage of exudate from around the waist,
The waist elastic member 4 is disposed in an extended state. Also,
A fastening tape 5 is provided to allow the wearer to easily remove the wearable diaper. An elastic member 6 around the leg is provided in the flap portion in an extended state in order to prevent leakage of exudate from around the leg during wearing.

The elastic members 6 around the abdomen are abdominal end portions 7a and 6a ', abdominal end fixing portions 6a and 6a', a dorsal end fixing portions 6b and 6b ', and the leg elastic members are the innermost portions. The innermost parts 6c and 6c 'on the ventral side, which are the parts arranged in the innermost parts 6d and 6d' on the dorsal side, and the outermost parts 6c and 6d between the abdominal part and the dorsal part are located outward with respect to the straight line. It is composed of a curved portion that is arranged in a curved manner, and a curved portion 6e that is a portion that is located farthest away from the straight line and is located outside.
The distance between the left and right innermost parts (6d-6d ') of the back side is longer than the distance between the left and right innermost parts (6c-6c') of the ventral part.

At least a part of the leg-surrounding elastic member 6 is arranged outside a straight line connecting the innermost parts 6c and 6d, and in the drawing, a curved portion 6e located farthest from the straight line.
Is located almost in the middle of the disposable diaper, but it is not always necessary to be in the middle, and it may be present preferably in the back side 7. Further, in the drawing, the distance between the left and right innermost portions (6d-6d ') on the back side is the distance between the left and right curved portions (6e-6).
Although it is formed longer than the distance e ′), the space between the curved portions may be formed wider, and there is no particular limitation. Further, the shortest distance between the curved portion 6e and the line connecting the innermost portions 6c and 6d is preferably 5 mm or more and 250 mm or less, and more preferably 20 mm or more and 100 mm or less. If this distance is too small, there is less room for the sheet between the absorber and the elastic member around the leg, and it is difficult for the elastic member around the leg to follow the movement of the wearer. On the other hand, if it is too large, the sheet will be loose around the legs, and the fit will be poor.

The end fixing portions 6a and 6b are innermost 6c and 6d
However, the end fixing portions 6a and 6b may be
It may be arranged outside of c and 6d, and is not particularly limited.

In the drawing, four leg elastic members 6 are arranged on the left and right, but may be one, and there is no particular limitation. The interval between the elastic members when a plurality of elastic members are arranged may be constant, but the interval may vary. In some cases, there may be intersections between the elastic members. Further, the thickness, draft rate, and gather strength of each elastic member may be the same or different. In addition, the leg elastic member 6
The draft rate and gather rate may be the same or different depending on the fixed position. The draft rate and the gather rate are calculated according to the following equations. Draft rate (%) = 100 × (length of elastic member in stretched state) / (length of elastic member in non-stretched state) Gather rate (%) = 100 × ｛(length of sheet in stretched state) − ( Length of unstretched sheet)｝ / (length of unstretched sheet)

FIG. 2 is an exploded plan view of the disposable diaper of FIG. 1 in a state where the elastic members around the legs are naturally contracted. In FIG. 2, the leg elastic member 6 of the diaper for use shrinks on a straight line connecting the innermost parts 6 c and 6 d and is stably present.
Pocket 10 is formed between absorber 3 and absorber 3. Since the wearer wears such a diaper in a state where the leg elastic members 6 are naturally contracted, the wearer 3 substantially
This is similar to the case where the diaper of the leg-surrounding elastic member 6 which is wider on the dorsal side than on the abdominal side and is arranged in a straight line is attached to the side.

FIG. 3 is a developed plan view assuming a state in which the disposable diaper of FIG. 1 is worn by a wearer. In FIG. 3, a part of the leg-surrounding elastic member 6 enters inside and exists above the absorber 3. The width of the leg-surrounding elastic member 6 entering the inside is determined by the distance between the absorber 3 and the leg-surrounding elastic member 6. In the conventional disposable diaper, the absorbent body 3 is narrowed in the crotch portion 8 to improve fit.
Alternatively, since the leg elastic member 6 is arranged by being bent inward at the crotch portion 8, the distance between the absorber 3 and the leg elastic member 6 is small, and the leg elastic member 6
Did not enter inside and come to the top of the absorber 3. For this reason, the diaper width of the crotch portion 8 has been specified by the width of the absorbent body 3 and the width of the leg-surrounding elastic members 6 arranged on the sides of the absorbent member 3 to sufficiently absorb the crotch portion 8.

However, as shown in the drawing, by arranging a part of the leg-surrounding elastic member 6 outside a straight line connecting the innermost part of the back part 7 and the abdominal part 9, the leg-surrounding elastic member 6 is formed. There is room for the seat between the absorber 3 and the elastic member 6 around the leg.
Not only enlarges the leg opening 11 by entering part of the upper part of the absorber 3, but also the diaper width of the crotch 8 is specified by the width of the absorber 3 of the crotch 8. The fit of the crotch part 8 can be improved without lowering the absorption capacity of the crotch part 3. Further, since the innermost part of the back part 7 is formed wider than the abdomen part 9 of the leg elastic member 6, the leg elastic member 6 is arranged so as to wrap the buttocks of the wearer. In addition, the feeling of fitting to the wearer is good, and the effect of preventing loose stools from leaking from the back side part 7 is enhanced.

FIG. 4 is a sectional view taken along line XX 'of FIG.
In FIG. 4, the leg circumference elastic member 6 enters the upper part of the absorber 3, so that not only the leg circumference opening 11 is enlarged, but also the diaper width of the crotch portion 8 is specified by the absorber 3 width of the crotch portion 8. Thus, the fit of the crotch portion 8 is improved without lowering the absorption capacity of the absorber 3. In addition, since there is room for the seat between the absorber 3 and the leg-surrounding elastic member 6, even if the wearer takes a posture in which the legs are greatly opened, a gap is not generated in the leg-surrounding portion.
The leg surrounding elastic member 6 follows the leg surroundings and prevents leakage of excrement from around the legs.

In the drawings, the absorber 3 is rectangular, but may be an hourglass or a T-shape, and is not particularly limited. Also, three-dimensional gathers may be arranged on the side of the absorber 3.

[0033]

As described above, in the disposable diaper of the present invention, the distance between the left and right innermost leg elastic members located on the back side and the abdominal side is more dorsal than the abdominal side. The diaper fits around the wearer's hips at the back, so that the diaper fits the wearer. A part of the middle part is curved outwardly with respect to the straight line connecting the two points located on the innermost side of the part and the abdominal part, so that it is located between the absorber and the elastic member around the leg. A margin is formed in the seat, the leg-surrounding elastic member is easily made to follow the movement of the wearer, and leakage is prevented without creating a gap between the diaper and the wearer.

Further, since the allowance of the sheet between the absorber and the elastic member around the leg is mainly formed from the crotch part to the back part, the diaper can be used with the wearer with the buttocks wrapped. To form a space between them and temporarily hold the loose stool even when loose stool is excreted to prevent the loose stool leaking from the absorber from immediately leaking past the leg surrounding elastic member. I have. Furthermore, with the diaper deployed, a leg elastic member that is curved outward is disposed on the wearer's body with a curved outer portion with respect to a straight line connecting the two innermost points of the back and the abdomen. At times, it may be stepped inside to form a substantially larger leg opening to accommodate wearers around the leg of various thicknesses.

[Brief description of the drawings]

FIG. 1 is a developed plan view of a disposable diaper according to the present invention, with a portion cut away.

FIG. 2 is a developed plan view of the disposable diaper of FIG. 1 in a state in which a leg elastic member is naturally contracted.

FIG. 3 is a developed plan view assuming a state in which the disposable diaper of FIG. 1 is worn by a wearer.

FIG. 4 is a sectional view taken along line X-X ′ of FIG. 3;

[Explanation of symbols]

 1. 1. Liquid-permeable topsheet 2. Liquid-impermeable back sheet Absorber 4. Waist elastic member 5. Fastening tape 6. Leg surrounding elastic members 6a, 6a '. Leg surrounding elastic member ventral end fixing portion 6b, 6b '. Leg surrounding elastic member back end fixing portion 6c, 6c '. 6d, 6d '. 6e, 6e '. 6. Elbow elastic member curved portion Ventral side 8. Inseam 9. Dorsal side 10. Pocket 11. Leg opening

[Procedure amendment]

[Submission date] October 14, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0027

[Correction method] Change

[Correction contents]

In the drawing, four leg elastic members 6 are arranged on the left and right, but may be one, and there is no particular limitation. The interval between the elastic members when a plurality of elastic members are arranged may be constant, but the interval may vary. In some cases, there may be intersections between the elastic members. Further, the thickness, draft rate, and gather strength of each elastic member may be the same or different. In addition, the leg elastic member 6
The draft rate and gather rate may be the same or different depending on the fixed position. The draft rate and the gather rate are calculated according to the following equations. Draft rate (%) = 100 × (length of elastic member in stretched state) / (length of elastic member in non-stretched state) Gather rate (%) = 100 × ｛(length of sheet in stretched state) − ( Length of unstretched sheet)｝ / (length of unstretched sheet)

Claims (1)

[Claims] 1. An absorbent body having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between the two sheets, wherein the absorbent body is worn by a wearer when worn. A crotch portion located at the crotch portion, an abdomen portion located on the abdomen side, and a dorsal portion portion located on the dorsal side, the both sides in the width direction of the absorbent body, the crotch portion from the abdomen portion And a pair of left and right elastic members arranged in a stretched state over the back side portion, the distance between the left and right elastic members located on the back side portion is abdominal. A disposable diaper characterized by being disposed wider than a distance between left and right elastic members located on a side portion, and an intermediate portion of the elastic member being curved outward.