JP3751504B2 - Disposable paper diapers - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disposable paper diaper in which side flaps are eliminated to improve appearance, and both side portions of an absorbent body are lifted and fitted to the body side.
[0002]
[Prior art]
Conventionally, the disposable diapers provided on the market are, as shown in FIG. 9 and FIG. 10, a liquid-impermeable back sheet 51 made of polyethylene or the like disposed on the back surface side, a nonwoven fabric disposed on the front surface side, or the like. And a substantially hourglass-shaped absorber 53 disposed between the liquid-impervious back sheet 51 and the liquid-permeable front sheet 52, and both sides of the paper diaper. In, a three-dimensional gather BS standing up on the surface side is formed by a three-dimensional gather sheet 54 made of a nonwoven fabric or the like provided on the surface side, and an elastic elastic member 55 arranged along the inner edge thereof, A side flap portion in which the absorber 53 is not interposed by the liquid-impervious back sheet 51 portion that extends to the side of the side edge of the absorber 53 and the outer sheet portion of the three-dimensional gather sheet 54. F is formed, and a plurality of thread-like elastic rubbers 57, 57... Are arranged between them along the longitudinal direction of the paper diaper, so that a pleated flat gather GK is formed on the side flap portion SF. Yes. Examples of disposable paper diapers adopting such a structure include those described in Japanese Patent Publication No. 6-93901, Japanese Patent Application Laid-Open No. 8-66424, and the like.
[0003]
[Problems to be solved by the invention]
As described above, in the case of the conventional disposable diaper structure, the planar shape of the absorbent body is substantially hourglass-shaped so as not to give a sense of creaking to the crotch portion due to the presence of the relatively rigid absorbent body 53. There has been a problem that the absorbent body width at the crotch part serving as the discharge part becomes narrower than the others and the fluid absorption ability decreases. In order to deal with this problem, for example, it is conceivable to make the absorber relatively large while making it an hourglass shape. However, in this case, as shown in FIG. There was a problem that it did not fit, and on the contrary it gave a sense of rattling and the wearability deteriorated.
[0004]
On the other hand, in recent years, products have been made compact and thin for reasons such as portability and containment. However, in the case of the disposable disposable diapers described above, the width of the absorber at the crotch portion is reduced. It was not possible, and it was an obstacle to downsizing.
[0005]
On the other hand, in order to block body fluid leaking over the three-dimensional gather BS, a side flap SF without an absorber is formed around the legs on the outer side than the side edge of the absorber, and elastic elastic members 57, 57 Are arranged to form a planar gather GK. However, there is a problem that the side flap SF that is formed to protrude outward in a frill-like shape deteriorates in appearance.
[0006]
Therefore, the main problem of the present invention is to ensure sufficient absorption performance while achieving compactness and the like, and to eliminate the feeling of stickiness and stickiness by fitting the absorbent body along the curve line of the buttocks. It is in. At the same time, the side flaps formed along the circumference of the legs are eliminated, and the circumference of the legs is cleaned to improve the appearance.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention includes an absorber, a liquid-permeable surface sheet that covers the surface side of the absorber, and a back sheet that covers the back surface side of the absorber. In disposable disposable diapers with gathers,
The liquid-permeable surface sheet is wound around the absorber side edge at the both sides in the longitudinal direction of the absorbent body and is extended and fixed to the back side of the absorbent body, and the gathered nonwoven fabric for forming the three-dimensional gather is the The absorber side edge wound by the liquid-permeable surface sheet is further wound from the upper side and extended to the back side of the absorber and fixed, and the back side sheet absorbs the side edge in the longitudinal direction at least at the leg portion. The side flaps are eliminated around the legs by almost matching the side edges of the body,
With disposing the resilient and elastic members in the upright front end portion of the gather nonwoven erected involving the absorption side edges disposed a resilient and elastic members on the back sides of the at least the absorber along the diaper longitudinal direction,
In the product state, both sides of the absorbent body are gathered together with the gathered nonwoven fabric by the elastic force of the elastic elastic members arranged at the standing tip portion of the gathered nonwoven fabric and the elastic elastic members arranged on both sides of the back surface of the absorbent body. While standing up, this standing part has a lower half part constituted by the absorbent body side part, and an upper half part of the gathered non-woven fabric forming the three-dimensional gathers extends outward from the edge part of the absorbent body. It is characterized by being configured .
[0008]
In this case, it is desirable that the planar shape of the absorber is rectangular.
[0009]
In the present invention, in order to achieve compactness and the like, the absorber is preferably rectangular, the liquid-permeable surface sheet is wound around the side edge of the absorber and the back surface of the absorber extends to the side, and the three-dimensional gather Similarly, the gathered non-woven fabric is formed so that the side edges of the absorbent body are rolled up so that the back surface of the absorbent body extends to the side. Accordingly, the side flaps are not formed around the legs, so that the appearance is good.
[0010]
Further, since the absorption surface area can be secured even if the width of the absorbent body is narrowed, leakage can be prevented, and the crotch portion can be prevented from being worn. In addition, elastic elastic members are disposed along the longitudinal direction on both sides of the back surface of the absorber. Therefore, since this elastic expansion / contraction member lifts the absorber side portion upward to fit the body, the absorber is fitted along the curve line of the buttocks, and the feeling of shakiness is eliminated. Moreover, even if it is a case where the width | variety of an absorber is made wide, it becomes easy to fit a body.
[0011]
In this disposable paper diaper, the gathering mode of the gathered nonwoven fabric and the absorbent body (actually a liquid-permeable surface sheet is interposed) is, for example, a fastening region of the gathered nonwoven fabric with respect to the absorbent side, from the absorber side edge to the back side. The first aspect of the range extending over the wrinkles, and the fixing region of the gathered nonwoven fabric to the absorber side is a range where the back surface reaches the wrinkle from a position slightly inside the absorber side edge, and the back side of the absorber and the gathers And a second embodiment in which a pocket is formed between the nonwoven fabric and the nonwoven fabric. By preventing the gathered nonwoven fabric from being fixed at least from the absorber side edge to the upper surface of the absorber, the effective area of the absorber can be utilized to the maximum, and the absorber side edge In addition, urine and the like can be re-absorbed from the pocket into the absorber, and the absorption performance can be improved.
[0012]
On the other hand, by forming embossed lines on both side portions on the surface side of the absorbent body, the side portions of the absorbent body are easily bent and easily fitted to the body.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is a partially broken development view of a disposable diaper according to the present invention, FIG. 2 is a view taken along the line II-II in FIG. 1, and FIG. 3 is a view taken along the line III-III in FIG.
[0014]
In FIG. 1, the disposable paper diaper has a rectangular shape in plan and is made of cotton-like pulp or the like, and has an absorbent body 3 having a certain degree of rigidity, crepe paper 4 surrounding the absorbent body 3, urine, and the like. A liquid-permeable topsheet 2 that covers the use surface side of the absorbent body 3 so as to allow quick permeation, and is wound around the side edge portion of the absorbent body 3 and extends to the back surface side of the absorbent body 3 to be bonded. The back sheet 1 is made of nonwoven fabric and covers the back side of the absorbent body 3; the waterproof film 5 made of polyethylene or the like interposed between the absorbent body 3 and the back sheet 1; The three-dimensional gather BS standing on the front surface side was formed, and the absorber side edge portion wound by the liquid-permeable surface sheet 2 was further wound from the upper side to extend to the back surface side of the absorber 3 and bonded. Ga It is mainly composed of over nonwoven 6.
[0015]
Further, the back sheet 1, the waterproof film 9 and the liquid-permeable surface sheet 2 extend together at the abdomen and back of the paper diaper to form an end flap part EF in which the absorbent body 3 does not exist, and the end flap part EF On the other hand, elastic stretch tapes 7 and 7 made of urethane foam or the like are interposed between the waterproof film 5 and the liquid-permeable surface sheet 2 to form a waist gather. Fastening tapes 12 and 12 used for attaching a paper diaper are fixed to both sides on the back side.
[0016]
The paper diaper structure will be described in detail below.
The absorbent body 3 is formed with a planar shape formed into a square shape, and the width dimension thereof is a dimension width that does not give the wearer a feeling of sticking by hitting the crotch portion. A conventional hourglass-like absorber is reduced in size. The absorbent body 3 is surrounded by the crepe paper 4 in order to maintain the shape and improve the diffusibility of the body fluid that has passed through the liquid-permeable surface sheet 2.
[0017]
As the liquid-permeable surface sheet 2 that covers the surface side (skin contact surface side) of the absorbent body 3, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. As the material fibers constituting the nonwoven fabric, in addition to olefins such as polyethylene or polypropylene, polyesters, polyamides, and other synthetic fibers, regenerated fibers such as rayon and cupra, and natural fibers such as cotton can be used. 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, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft. When a large number of through holes are formed in the liquid-permeable surface sheet 2, urine and the like are rapidly absorbed, and the dry touch property is excellent. The liquid permeable top sheet 2 extends to the back surface side of the absorbent body 3 around the absorbent side edge.
[0018]
On the other hand, in this disposable paper diaper, the back sheet 1 made of a nonwoven fabric is used instead of the liquid-impervious back sheet made of polyethylene or the like usually used to cover the outer surface of the diaper, and the liquid-impervious property is ensured. Therefore, a waterproof film 5 made of polyethylene or the like is interposed between the absorber 3 and the back sheet 1.
[0019]
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 is substantially coincident with the side edge line of the absorber 3. In addition, the waterproof film 5 has a rectangular shape in accordance with the shape of the absorber, but its width dimension is shorter than the width dimension of the absorber 3, and both sides of the waterproof film 5 are It joins with the said liquid-permeable surface sheet 2 which rolled in the side edge part and extended to the back surface side of the absorber 3. FIG. The wrapping width of the liquid-permeable surface sheet 2, that is, the distance from the absorber side edge to the waterproof film joint is preferably about 1 to 50 mm, and more preferably about 25 mm.
[0020]
In recent years, a film having moisture permeability is preferably used as the waterproof film 5 from the viewpoint of preventing stuffiness. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. If the sheet thickness is the same, the rigidity is lower than that of the non-porous sheet, which is superior in terms of flexibility.
[0021]
In addition, in this paper diaper, in order to improve the appearance and to ensure air permeability at the waist side portion, the back sheet is made of a nonwoven fabric, and the waterproof film 5 is provided between the absorbent body 3 and the liquid-impervious property. However, the waterproof film 5 may be omitted as usual, and a liquid-impervious plastic sheet such as polyethylene or polystyrene may be used as the back sheet. The waterproof film 5 and the back sheet 1 may not be disposed and laminated individually, but a laminated nonwoven fabric in which a waterproof film and a nonwoven fabric are laminated in advance may be used.
[0022]
On the other hand, as shown in FIG. 2 and FIG. 3, the gathered nonwoven fabric 6 forming the three-dimensional gathered BS is a nonwoven fabric made into a double sheet by folding, and the absorbent body 3 engulfed by the liquid-permeable surface sheet 2. These side edges are further wound from the upper side and extended to the back side of the absorbent body 3 to be bonded. More specifically, the gathered nonwoven fabric 6 has a three-dimensional gather BS forming portion at the middle portion in the longitudinal direction of the paper diaper shown in FIG. 2 and adheres the middle portion in the width direction to the side edge of the absorbent body 3. As shown in FIG. 3, the section S1 up to the edge of the wrap is wrapped around the side edge of the absorbent body 3 and bonded to the back side of the absorbent body with a hot melt adhesive or the like. In addition, the back surface of the absorber 3 is bonded to the section S1 from the intermediate portion in the width direction to the edge of the one side, and the three-dimensional gather BS forming portion is bonded to the upper surface side of the absorber 3 with a hot melt adhesive or the like It is adhered by.
[0023]
As the material fibers constituting the back sheet 1 and the gathered nonwoven fabric 6, as in the case of the liquid-permeable surface sheet 2, in addition to synthetic fibers such as polyethylene or polypropylene such as olefin, polyester, and amide, rayon and cupra Non-woven fabrics obtained by appropriate processing methods such as the spunbond method, thermal bond method, melt blown method, needle punch method can be used. In order to prevent stuffiness, it is preferable to use a non-woven fabric that suppresses the basis weight and has excellent air permeability. Furthermore, with respect to the gathered nonwoven fabric 6, in order to prevent permeation of urine and the like, to prevent fogging, and to improve the touch to the skin (dry feeling), silicon-based, paraffin metal-based, alkylchromic chromoid-based water repellent It is desirable to use a water-repellent non-woven fabric coated with such as.
[0024]
Inside the gathered nonwoven fabric 6 formed of the double sheet nonwoven fabric, a thread-like elastic elastic member 8 is arranged at the standing tip portion, and a thread-like elastic elastic member 9 is arranged near the side edge of the absorbent body 3. Further, the elastic elastic members 10 are respectively disposed on the back side of the absorber 3 on the lateral side. The tip elastic elastic member 8 is mainly used to form a three-dimensional gather BS by raising a non-woven fabric portion protruding from the absorber side edge by its elastic elastic force. As shown in the product state diagram of FIG. 4 mainly by the elastic expansion and contraction force, the side portion of the absorber 3 is bent and the side portion is lifted upward. As shown by ▼ in FIG. 1 and FIG. 4, the bent portion is provided with embossed wires 11, 11 along the bent line on the surface side of the absorbent body 3 so that the side portion of the absorbent body 3 is easily bent. It is desirable to form. The standing length HL from the bent portion to the side edge of the absorber is 5 to 30 mm, preferably 20 to 30 mm. When the standing length HL is less than 5 mm, it is too short to make it difficult to bend the absorber side portion, and sufficient fit to the skin cannot be ensured. On the other hand, if the standing length HL exceeds 30 mm, the standing length is too long and cannot be bent effectively.
[0025]
In addition, about the number of arrangement | positioning of the said thread-like elastic expansion-contraction member, the back surface of the absorber 3 in order to lift the thread-like elastic expansion-contraction member 8 arrange | positioned in the front-end | tip part in order to form solid gather BS, and an absorber side part It is necessary to dispose at least two elastic expansion / contraction members in total with the thread-shaped elastic expansion / contraction member 10 disposed on the side of the flange, but preferably two on the solid gather BS side with the absorber side edge as a boundary. As described above, it is desirable to arrange two or more on the back side of the absorber. As the thread-like elastic elastic members 8 to 10, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, or the like that are generally used are used. it can. Instead of the thread-like elastic elastic member, a tape-like elastic elastic member having a certain width may be used.
[0026]
The adhesion range of the gathered nonwoven fabric 6 to the absorbent body 3 side is a range that extends from the absorption side edge to the back surface in the embodiment shown in FIG. As a result, as shown in FIG. 4, the three-dimensional gather BS extends continuously 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 adhesion range of the gathered nonwoven fabric 6 is started from a position slightly inside the absorber side edge, so that the back side of the absorber 3 and the gathered nonwoven fabric 6 A pocket P may be formed between them. In this case, the liquid-permeable surface sheet 2 covering the surface side of the absorbent body 3 is coupled with the fact that the back surface of the absorbent body 3 extends to the side by wrapping the absorbent side edge section. Even if there is urine or loose stool that leaks over, leakage can be prevented in the pocket. That is, after urine, loose stool, or the like has entered the pocket P, it passes through the liquid-permeable surface sheet 2 extending from the side edge of the absorbent body 3 to the back, and is reabsorbed by the absorbent body 3 again. As a result, side leakage is reliably prevented.
[0027]
The stiffness of the absorber 3 to be used is such that when the thickness is relatively high and the stiffness is relatively high, the side portion of the absorber 3 cannot be effectively bent. Therefore, in the stiffness test defined in FIG. It is desirable to use an absorber whose h is approximately 14 mm or less. In this stiffness test, the absorbent body test body 20 having a width and height of 100 mm × 100 mm is folded so as to have a width of 50 mm, the edge is fixed to the reference line L, and the dimension is 100 mm thereon. X150mm and weight of 60g acrylic plate 21 is brought in, the center part is fixed to the reference line L, one end is brought into contact with the floor, and the other end is attached to the end (absorber bent side). ) Is measured, and a value (h) obtained by subtracting the bulk (thickness t × 2) of the absorber from the height H is used as a stiffness index.
[0028]
The advantages of such a disposable diaper will be described with reference to FIG. 5 showing the wearing state. The elastic elastic members 9 and 10 with the side edges and the back of the absorber 3 arranged on the side lift the absorber side portion upward. Furthermore, since the absorber is fitted along the curve line of the buttocks, the wearer does not feel a feeling of stickiness and is excellent in wearability. Further, since the upper surface of the absorbent body 3 is in close contact with the skin over the entire width and becomes an effective absorbent area, the absorbent performance is remarkably improved, and the liquid-permeable surface sheet 2 is at least a side edge of the absorbent body 3. Since the back surface of the absorber 3 has been trapped and the back surface has reached the side, further absorption of urine and the like can be achieved because the urine can be reabsorbed from the side edge of the absorber 3 and the pocket P formed on the back side of the absorber. It can be made difficult to leak. In addition, the improvement of the absorption performance enables a reduction in size and thickness.
[0029]
Further, the conventional side flap formed along the leg circumference is eliminated, and the leg circumference is neat and the appearance is improved. In addition, various advantages are brought about such as reduction in the use area of the waterproof film 5 and reduction in manufacturing cost as the absorbent body 3 is reduced.
[0030]
By the way, the cross-sectional shape of the three-dimensional gather BS is folded back outward in the middle of the standing portion, as shown in FIG. 7, for example, in addition to the gathered structure standing linearly. It can also be arranged and inverted. These three-dimensional gather shapes are arbitrary. In the above example, in order to make the disposable diaper compact, the planar shape of the absorbent body 3 is a square shape, but it may be an hourglass shape.
[0031]
The present invention has been described above by taking the tape-fixed paper diaper as an example. However, the present invention can be applied to a pants-type paper diaper in exactly the same manner.
[0032]
【The invention's effect】
As described above in detail, according to the present invention, sufficient absorption performance can be ensured while achieving compactness and the like, and by fitting the absorbent body along the curve line of the buttock, a feeling of stickiness and a feeling of stickiness Can be eliminated. At the same time, it is possible to improve the appearance by eliminating the side flaps formed around the legs and making the legs clear.
[Brief description of the drawings]
FIG. 1 is a partially broken 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 the line III-III in FIG. 1;
FIG. 4 is a cross-sectional view of the disposable disposable diaper in a product state.
FIG. 5 is a view showing a wearing state of the disposable paper diaper.
FIG. 6 is a cross-sectional view showing another bonding mode of the gathered nonwoven fabric 6 and the absorbent body.
FIG. 7 is a cross-sectional view illustrating another embodiment of the three-dimensional gather BS.
FIG. 8 is a test procedure diagram for evaluating the stiffness of the absorber.
FIG. 9 is a development view showing a conventional disposable diaper.
10 is a view taken along the line XX in FIG. 9;
FIG. 11 is a mounting state diagram for explaining problems of a conventional disposable diaper.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Back surface sheet (nonwoven fabric), 2 ... Liquid-permeable surface sheet, 3 ... Absorber, 4 ... Crepe paper, 5 ... Waterproof film, 6 ... Gathered nonwoven fabric, 7 ... Elastic elastic tape, 8-1012 ... Yarn-like elasticity Elastic member, 11 ... Embossed wire, EF ... End flap, BS ... Solid gather

Claims (6)

In a disposable paper diaper including a absorbent body, a liquid-permeable surface sheet covering the surface side of the absorbent body, and a back sheet covering the back side of the absorbent body, and a three-dimensional gather formed on both sides of the front surface,
The liquid-permeable surface sheet is wound around the absorber side edge at the both sides in the longitudinal direction of the absorbent body and is extended and fixed to the back side of the absorbent body, and the gathered nonwoven fabric for forming the three-dimensional gather is the The absorber side edge wound by the liquid-permeable surface sheet is further wound from the upper side and extended to the back side of the absorber and fixed, and the back side sheet absorbs the side edge in the longitudinal direction at least at the leg portion. The side flaps are eliminated around the legs by almost matching the side edges of the body,
With disposing the resilient and elastic members in the upright front end portion of the gather nonwoven erected involving the absorption side edges disposed a resilient and elastic members on the back sides of the at least the absorber along the diaper longitudinal direction,
In the product state, both sides of the absorbent body are gathered together with the gathered nonwoven fabric by the elastic force of the elastic elastic members arranged at the standing tip portion of the gathered nonwoven fabric and the elastic elastic members arranged on both sides of the back surface of the absorbent body. While standing up, this standing part has a lower half part constituted by the absorbent body side part, and an upper half part of the gathered non-woven fabric forming the three-dimensional gathers extends outward from the edge part of the absorbent body. Disposable paper diapers characterized by being configured . The disposable diaper according to claim 1, wherein the planar shape of the absorber is a square. The disposable paper diaper according to any one of claims 1 and 2, wherein a fixed region of the gathered nonwoven fabric with respect to the absorber side is a range extending from the absorber side edge portion to the back surface. The fixed region with respect to the absorber side of the gathered nonwoven fabric is set to a range where the back surface reaches the side from a position slightly inside the absorber side edge, and a pocket is formed between the back side of the absorber and the gathered nonwoven fabric. The disposable paper diaper according to any one of? The disposable paper diaper according to any one of claims 1 to 4, wherein a surface of the absorbent body is on both sides of the ridge and an embossed line is formed along a rising portion bending line of the absorbent body. The disposable paper diaper according to any one of claims 1 to 5, wherein the back sheet is a non-woven fabric and a waterproof film bonded to the liquid-permeable surface sheet is interposed between the absorbent body and the absorbent body.

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