JP2001340380A - Disposable paper diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To assure sufficient absorbability while simplifying a disposable paper diaper and to allow an absorber to be fitted along a curve line of a gluteal region. SOLUTION: In the disposable paper diaper comprising the absorber 3, a liquid permeable surface sheet 2 covering a surface side of the absorber 3 and a rear surface sheet 1 covering a front surface side of the absorber 3 in such a manner that both side parts of the front surface side are formed with stereoscopic gathers BS, the sheet 2 is extended and fixed to the rear surface side of the absorber 3 by winding the absorber side edge at both sides of the absorber 2 in its longitudinal direction, the absorber side edge wound by the sheet 2, the absorber side edge for winding a gather nonwoven fabric 6 for forming the gathers BS by the sheet 3 is further wound from its upper side, extended and fixed to the rear surface side of the absorber 3 and at least an elastically stretching member 10 is arranged along the longitudinal direction at both sides of the rear surface of the absorber 3, and the sheet 1 is substantially brought at the side edge of at least the site around a leg into coincidence with the side edge of the absorber 3 in the longitudinal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable disposable diaper in which the side flaps are eliminated to improve the appearance and both sides of the absorbent body are lifted and fitted to the body.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 9 and 10, a disposable backsheet made of polyethylene or the like is provided on the back side of a disposable diaper.
1, a liquid-permeable topsheet 52 made of a nonwoven fabric or the like disposed on the front side, and a substantially hourglass-shaped absorber 53 disposed between the liquid-impermeable backsheet 51 and the liquid-permeable topsheet 52 On the both sides of the disposable diaper, a three-dimensional gather sheet 54 made of a non-woven fabric or the like provided on the front side and an elastic elastic member 55 disposed along the inner edge thereof on the front side. Standing three-dimensional gather BS
Is formed, and the side where the absorber 53 is not interposed is formed by the liquid-impervious back sheet 51 portion extending to the side of the side edge of the absorber 53 and the outer sheet portion of the three-dimensional gather sheet 54. The flap portions SF are formed, and a plurality of thread-like elastic rubbers 57, 57,... Are arranged between the flap portions along the longitudinal direction of the paper diaper, so that a pleated flat gather GK is formed on the side flap portions SF. Have been. As a disposable paper diaper adopting such a structure, for example, Japanese Patent Publication No. 6-93901,
JP-A-8-66424 and the like can be mentioned.

[0003]

As described above, in the case of the conventional disposable diaper structure, the absorber 53 having a relatively high rigidity is used.
, So as not to give the crotch with the presence of
Since the planar shape of the absorber is substantially hourglass-shaped, there has been a problem that the absorber width at the crotch portion serving as the body fluid discharge portion is narrower than the others, and the body fluid absorbing ability is reduced. In order to cope with this problem, for example, it is conceivable to make the absorber relatively large while making it hourglass-shaped, but in this case, as shown in FIG. There is a problem that it does not fit and conversely gives a feeling of looseness and deteriorates the mountability.

On the other hand, in recent years, products have been reduced in size and thickness for reasons such as portability and storage. However, in the case of the above-mentioned disposable paper diapers, the absorbent material at the crotch portion is used. The width could not be reduced, which was an obstacle to downsizing.

On the other hand, in order to stop the body fluid leaking over the three-dimensional gather BS, a side flap SF having no absorber is formed around the leg outside the side edge of the absorber, and an elastic elastic member is provided. Are arranged to form a planar gather GK. However, the side flaps SF formed to protrude outward in a frill shape
Had a problem with the appearance.

Accordingly, a main object of the present invention is to provide a sufficient absorption performance while achieving compactness and the like, and to make the absorber fit along the curved line of the buttocks to provide a feeling of stiffness and looseness. Is to eliminate.
At the same time, there is a need to eliminate side flaps formed along the leg circumference and to improve the appearance by clearing the leg circumference.

[0007]

In order to solve the above-mentioned problems, the present invention provides an absorber, a liquid-permeable top sheet covering the front side of the absorber, and a back sheet covering the back side of the absorber. In a disposable disposable diaper having three-dimensional gathers formed on both sides thereof, the liquid-permeable topsheet is rolled around the absorber side edges on both sides in the longitudinal direction of the absorber and extends to the back side of the absorber. And a gathered nonwoven fabric for forming the three-dimensional gathers is further wound around the absorber side edge wound by the liquid-permeable top sheet from above and extended to the back side of the absorber and fixed. And, disposed elastic elastic members along the longitudinal direction at least in the vicinity of both sides of the back surface or both sides of the back surface of the absorber,
The back sheet is characterized in that a longitudinal side edge substantially coincides with a side edge of the absorber at least in a leg-surrounding portion. In this case, it is desirable that the planar shape of the absorber be a square shape.

In the present invention, the absorber is preferably formed in a rectangular shape in order to achieve compactness or the like, and the liquid-permeable topsheet is wound around the side edge of the absorber so that the back surface of the absorber extends all the way. Similarly, a gathered nonwoven fabric for forming a three-dimensional gather is configured so that the side edges of the absorber are rolled up so that the back surface of the absorber extends all the way. Therefore,
Since no side flaps are formed around the legs, the appearance is good.

Further, since the absorption surface area can be ensured even when the width of the absorber is reduced, leakage can be prevented, and the crotch can be prevented from having a crunch. In addition, elastic elastic members are disposed along the longitudinal direction on both sides of the back surface of the absorber. Therefore, since the elastic elastic member lifts the side of the absorber upward and fits the body, the absorber fits along the curved line of the buttocks, and the feeling of looseness is eliminated. Further, even if the width of the absorber is widened, it becomes easy to fit the body.

In the disposable disposable diaper, the gathered nonwoven fabric and the absorbent body (actually, a liquid-permeable topsheet is interposed therebetween) may be fixed, for example, by fixing a fixed region of the gathered nonwoven fabric to the absorbent body side with an absorbent side edge portion. And a region where the back surface of the absorbent body is fixed from the position slightly inside the side edge of the absorber to the back surface of the absorbent body. A second embodiment in which a pocket is formed between the side and the gathered nonwoven fabric can be given. By preventing the gathered nonwoven fabric from being fixed at least in the range from the absorber side edge to the absorber upper surface, the effective area of the absorber can be maximized, and the absorber side edge In addition, urine and the like can be re-absorbed from the pocket to the absorber again, so that the absorption performance can be improved.

On the other hand, by forming embossed lines on both sides of the surface side of the absorber, the side portions of the absorber are easily bent and fitted to the body.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a partially exploded development view of the disposable diaper according to the present invention, FIG. 2 is a view taken along line II-II of FIG. 1, and FIG. 3 is a view taken along line III-III of FIG.

In FIG. 1, a disposable disposable diaper has a square planar shape and is made of cotton-like pulp or the like and has a certain degree of rigidity.
And a crepe paper 4 surrounding the absorbent body 3 and covering the use surface side of the absorbent body 3 for quickly transmitting urine and the like, and extending to the back surface side of the absorbent body 3 by wrapping around the side edge of the absorbent body 3. Surface sheet 2 adhered and bonded, back sheet 1 made of non-woven fabric and covering the back side of absorber 3, waterproof film made of polyethylene or the like interposed between absorber 3 and back sheet 1 5 and a three-dimensional gather BS in which the surface of the disposable diaper stands on the front side on both sides, and the absorber side edge portion wound by the liquid-permeable top sheet 2 is further rolled up from the upper side to form the absorber 3. And a gathered non-woven fabric 6 extending to and adhered to the back surface side.

On the abdomen and back of the disposable diaper, the back sheet 1, the waterproof film 9 and the liquid-permeable top sheet 2 extend together to form an end flap portion EF in which the absorber 3 does not exist. For department EF,
Between the waterproof film 5 and the liquid permeable surface sheet 2, elastic elastic tapes 7, 7 made of urethane foam or the like and having air permeability are interposed to form waist gathers. Fastening tapes 12 used for attaching the disposable diaper are fixed to both sides on the back side.

In the following, the structure of the paper diaper will be described in more detail. The absorbent body 3 has a rectangular shape in plan view, and its width dimension is applied to the wearer by hitting the crotch portion. The dimension width does not give a feeling of stickiness. The conventional hourglass-shaped absorber has been reduced in size. The absorber 3 is surrounded by crepe paper 4 for maintaining the shape and improving the diffusivity of the bodily fluid transmitted through the liquid-permeable topsheet 2.

As the liquid permeable surface sheet 2 covering the surface side (skin contact surface side) of the absorber 3, a perforated or non-porous nonwoven fabric or a porous plastic sheet is preferably used. The material fibers constituting the nonwoven fabric can be synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, polyamides, etc., recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a method, a spun bond method, a thermal bond method, a melt blown method, and a needle punch method can be used. Among these processing methods, the spunlace method is excellent in that it is rich in flexibility and drapability, and the thermal bond method is excellent in that it is bulky and soft. When a large number of holes are formed in the liquid-permeable topsheet 2, urine and the like are quickly absorbed, and the dry touch property is excellent. The liquid-permeable topsheet 2 extends to the back side of the absorber 3 wrapping around the edge of the absorber.

On the other hand, in this disposable disposable diaper, a back sheet 1 made of a nonwoven fabric is used instead of a liquid-impermeable back sheet made of polyethylene or the like which is usually used to cover the outer surface of the diaper. A waterproof film 5 made of polyethylene or the like is interposed between the absorber 3 and the back sheet 1 in order to secure the waterproofness.

The back sheet 1 has a substantially hourglass shape, and at least the width around the legs is substantially the same as the width of the absorber 3 and has a shape substantially coincident with the side edge line of the absorber 3. I have. The waterproof film 5 is formed in a rectangular shape according to the shape of the absorber, but the width of the waterproof film 5 is shorter than the width of the absorber 3. It is joined to the liquid-permeable topsheet 2 wrapping around the side edge and extending to the back side of the absorber 3. The winding width of the liquid-permeable topsheet 2, that is, the distance from the side edge of the absorber to the joint portion of the waterproof film is approximately 1 to 5
It is preferably set to 0 mm, and particularly preferably set to about 25 mm.

As the waterproof film 5, in recent years, a film having moisture permeability from the viewpoint of preventing stuffiness is suitably used.
The water-impermeable and moisture-permeable sheet is a microporous sheet obtained by melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching the sheet uniaxially or biaxially. Yes, if the sheet thickness is the same, the rigidity is lower than that of the non-porous sheet, so that it is superior in flexibility.

In this paper diaper, the back sheet is made of a nonwoven fabric in order to improve the appearance and to secure air permeability at the waist side, and is waterproof to ensure liquid impermeability between the absorbent body 3 and the diaper. Although the film 5 is interposed, the waterproof film 5 may be omitted as usual and a liquid-impermeable plastic sheet such as polyethylene or polystyrene may be used as the back sheet. Instead of individually arranging and laminating the waterproof film 5 and the back sheet 1, a laminated nonwoven fabric in which a waterproof film and a nonwoven fabric are laminated in advance may be used.

On the other hand, as shown in FIGS. 2 and 3, the gathered nonwoven fabric 6 forming the three-dimensional gathers BS is a nonwoven fabric formed by folding back into a double sheet, and is wound by the liquid-permeable topsheet 2. The side edge portion of the absorber 3 is further rolled up from above and extends to the back surface side of the absorber 3 and is bonded. More specifically, the gathered nonwoven fabric 6 adheres the widthwise middle portion to the side edge portion of the absorber 3 while leaving a three-dimensional gather BS forming portion in the longitudinal middle portion of the disposable diaper shown in FIG. A section S1 up to one edge is wound around a side edge portion of the absorber 3 and adhered to the back surface side of the absorber with a hot melt adhesive or the like, and as shown in FIG. A section S1 from the middle portion in the width direction to one end of the wad is adhered over the back surface of the absorber 3, and the three-dimensional gather BS forming portion is attached to the upper surface of the absorber 3 with a hot melt adhesive or the like. It is adhered by.

The material fibers constituting the back sheet 1 and the gathered non-woven fabric 6 are also used as the liquid-permeable top sheet 2.
Similarly to synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters and amides, as well as recycled fibers such as rayon and cupra, and natural fibers such as cotton, the spun bond method and the thermal bond method A nonwoven fabric obtained by an appropriate processing method such as a melt blown method and a needle punch method can be used. In particular, it is preferable to use a nonwoven fabric having a low basis weight and excellent air permeability in order to prevent stuffiness. Further, regarding the gathered nonwoven fabric 6, in order to prevent permeation of urine and the like, prevent fogging, and enhance the feel (dry feeling) to the skin,
It is desirable to use a water-repellent nonwoven fabric coated with a silicon-based, paraffin-metal-based, alkylchromic-cloid-based water-repellent, or the like.

Inside the gathered non-woven fabric 6 formed by the double sheet non-woven fabric, a thread-like elastic elastic member 8 is disposed at the upright end portion, and a thread-like elastic elastic member is provided near the side edge of the absorber 3. 9 are provided, and furthermore, thread-like elastic elastic members 10 are provided on the back side of the absorber 3 respectively. The tip elastic elastic member 8 is used to form a three-dimensional gather BS by mainly erecting a nonwoven fabric portion protruding from the side edge of the absorber by its elastic elastic force. Is for bending the side of the absorber 3 and lifting the side upward, as shown in the product state diagram of FIG. 4 mainly by the elastic stretching force. 1 and 4, embossed lines 11, 11 are provided along the bending lines on the surface side of the absorber 3 so that the side portions of the absorber 3 are easily bent, as indicated by marks ▼ in FIGS. It is desirable to form. The upright length HL from the bent portion to the side edge of the absorber is 5 to 30 mm, preferably 20 to 30 mm.
It is desirable to set it to 30 mm. The standing length HL is 5 mm
If it is less than 10 mm, it will be too short to bend the absorber side portion, and sufficient fit to the skin cannot be ensured. On the other hand, if the upright length HL exceeds 30 mm, a problem arises that the upright length is too long to bend effectively.

The number of the thread elastic elastic members provided is such that the thread elastic elastic member 8 arranged at the tip of the upright portion for forming the three-dimensional gather BS, and the absorbent member for lifting the absorber side portion. It is necessary to dispose at least a total of two elastic elastic members with the thread-like elastic elastic member 10 whose back surface is disposed on the waist side, but it is preferable to arrange the three-dimensional gather BS side with the absorber side edge as a boundary. It is desirable to arrange two or more pieces on the back side of the absorber. As the thread-like elastic elastic members 8 to 10, it is possible to use materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, and polyester which are usually used. it can. It should be noted that a tape-shaped elastic elastic member having a certain width may be used instead of the thread elastic elastic member.

In the embodiment shown in FIG. 4, the range of adhesion of the gathered nonwoven fabric 6 to the absorber 3 side is a range extending from the absorption side edge to the back surface. As a result, as shown in FIG. 4, the three-dimensional gather BS extends as if continuous from the side edge of the absorber 3, and the entire width of the absorber 3 becomes an effective absorption area. Further, as shown in FIG. 6, the bonding range of the gathered nonwoven fabric 6 is started from a position slightly inside the side edge of the absorber, so that the back side of the absorber 3 and the gathered nonwoven fabric 6 are joined. A pocket P may be formed therebetween. In this case,
The urine leaking over the side edge of the absorber 3 in combination with the fact that the liquid-permeable top sheet 2 covering the surface side of the absorber 3 wraps around the side edge of the absorber and the back surface of the absorber 3 extends all the way. Even if there is loose stool or the like, leakage can be prevented in the pocket. That is, after the urine, loose stool and the like enter the pocket P, the urine, loose stool and the like penetrate the liquid-permeable topsheet 2 extending from the side edge to the back side of the absorber 3 and are re-absorbed by the absorber 3 And lateral leakage is reliably prevented.

The stiffness of the absorber 3 to be used is such that when the absorber 3 is thick and has relatively high stiffness, the side portion of the absorber 3 cannot be bent effectively. It is desirable to use an absorber having an index height h of about 14 mm or less. In this rigidity test, 50 samples of the absorbent body 20 having a width and a height of 100 mm × 100 mm were measured.
mm, and the edge is fixed to the reference line L, and a dimension of 100 mm × 15
Acrylic plate 21 of 0 mm and weighing 60 g is brought in, the central part is fixed to the reference line L, one end is in contact with the floor surface, and the other is the end (absorbent bent side). Is a test method in which a value (h) obtained by subtracting the bulk (thickness t × 2) of the absorber from this height H is used as a stiffness index.

The advantages of such a disposable diaper will now be described with reference to FIG. 5, which shows a state in which the disposable diaper is mounted. Since the absorbent body is fitted along the curve line of the buttocks to lift the body, the wearer does not feel a feeling of looseness and the wearability is excellent. In addition, since the upper surface of the absorber 3 is in close contact with the skin over the entire width to form an effective absorption area, the absorption performance is remarkably improved, and the liquid-permeable topsheet 2 is formed at least at the side edges of the absorber 3. Since the back surface reaches the alligator, the urine and the like can be reabsorbed from the side edge of the absorber 3 and the pocket P formed on the lower surface of the absorber.
The absorption performance is improved, and it is possible to make it difficult for side leakage to occur. Also,
By improving these absorption performances, it is possible to reduce the size and thickness.

Furthermore, the conventional side flap formed along the leg circumference is eliminated, and the leg circumference is made clearer, so that the appearance is improved. In addition, absorber 3
Various advantages are brought about, such as the use area of the waterproof film 5 is reduced along with the reduction in size, so that the manufacturing cost can be reduced.

The cross-sectional shape of the three-dimensional gather BS is different from that of the above-described gather structure which stands straight, for example, as shown in FIG. Arrange the member 12,
It can also be inverted. These three-dimensional gather shapes are optional. In the above example, the absorber 3 has a square planar shape in order to make the disposable diaper more compact. However, the absorber 3 may have an hourglass shape.

Although the present invention has been described above with reference to a tape-fastened paper diaper as an example, the present invention can be applied to a pants-type paper diaper.

[0031]

As described above in detail, according to the present invention, it is possible to secure a sufficient absorption performance while achieving compactness and the like, and to fit the absorbent body along the curved line of the buttocks by fitting the absorbent body. It is possible to eliminate a feeling of stickiness and a feeling of looseness. At the same time, it is possible to eliminate side flaps formed along the circumference of the leg and to improve the appearance by clearing the circumference of the leg.

[Brief description of the drawings]

FIG. 1 is a partially exploded development view of the disposable paper diaper.

FIG. 2 is a view taken along the line II-II in FIG.

FIG. 3 is a view taken along line III-III of FIG. 1;

FIG. 4 is a cross-sectional view of a product state of the disposable paper diaper.

FIG. 5 is an attached state diagram of the disposable paper diaper.

FIG. 6 is a cross-sectional view showing another mode of bonding the gathered nonwoven fabric 6 and the absorber.

FIG. 7 is a cross-sectional view showing another mode of forming the three-dimensional gather BS.

FIG. 8 is a test procedure diagram for evaluating the rigidity of the absorber.

FIG. 9 is a development view showing a conventional paper diaper.

FIG. 10 is a view taken along line XX of FIG. 9;

FIG. 11 is a mounting state diagram for explaining a problem of a conventional disposable diaper.

[Explanation of symbols]

1: back sheet (nonwoven fabric), 2: liquid-permeable top sheet, 3
... absorbent, 4 ... crepe paper, 5 ... waterproof film, 6 ... gathered non-woven fabric, 7 ... elastic elastic tape, 8-10.12 ...
Thread elastic elastic member, 11: embossed wire, EF: end flap, BS: solid gather

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 3B029 BA02 BC02 BC06 BC07 BD13 BD14 BD16 BD17 4C098 AA09 CC04 CC08 CC10 CC12 CC15 CE08 DD03 DD04 DD10 DD22 DD23 DD25 DD26

Claims (6)

[Claims] 1. A disposable article comprising an absorber, a liquid-permeable top sheet covering the front side of the absorber, and a back sheet covering the back side of the absorber, wherein a three-dimensional gather is formed on both sides of the front surface. In the disposable diaper, the nonwoven fabric for forming the three-dimensional gather while fixing the liquid-permeable topsheet on both sides in the longitudinal direction of the absorber by winding the side edges of the absorber and extending to the back side of the absorber. The side edge portion of the absorber wound by the liquid-permeable top sheet is further wound from above and extended to the back side of the absorber and fixed, and at least in the vicinity of both back side portions or the back side portions of the absorber. An elastic elastic member is provided along the longitudinal direction, and the back sheet has a longitudinal side edge substantially coincident with a side edge of the absorber at least in a leg surrounding area. Disposable diapers. 2. The disposable disposable diaper according to claim 1, wherein the absorber has a square planar shape. 3. The disposable disposable diaper according to claim 1, wherein a fixing area of the gathered nonwoven fabric to the absorber side extends from an edge of the absorber side to a back surface. 4. A region where the gathered nonwoven fabric is fixed to the absorber side is a range from a position slightly inside the side edge of the absorber to the back side, and a pocket is provided between the back side of the absorber and the gathered nonwoven fabric. 3. The disposable disposable diaper according to claim 1, which is formed. 5. The disposable paper diaper according to claim 1, wherein the surface of the absorbent body has embossed lines formed on both sides thereof. 6. The disposable disposable diaper according to claim 1, wherein said back sheet is made of a non-woven fabric, and a waterproof film bonded to said liquid-permeable top sheet on both sides thereof is interposed between said back sheet and said absorber. .