JP3008126B2 - Disposable diapers with pocket structure - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a disposable diaper, and in particular, to prevent urine from returning from an absorbent core (wet back),
The present invention relates to a disposable diaper having a pocket structure capable of reducing the feeling of squeezing and discomfort of the skin in contact with the diaper, and covering the stool excreted from a human.

[Conventional technology and its problems] In recent years, disposable disposable diapers have rapidly spread in place of cloth diapers. One of the reasons is that the capacity of the absorbent core for storing excrement has been greatly improved, and its convenience has become known. However, conventional products have a point of preventing excretion leakage and a feeling of squeezing of the skin in contact with the diaper,
It was still inadequate in eliminating discomfort.

Many proposals have been made on the prevention of leakage of disposable diapers, one example of which is disclosed in JP-A-62-250201.
No. 6,009,036. The above disposable diapers
This is a disposable diaper having an absorbent core disposed between a liquid-permeable topsheet and a liquid-impermeable backsheet, and having elastic shrinkage gasket cuffs and barrier cuffs on side edges of the topsheet. In this diaper, another set of elastically contractible barrier cuffs is attached to the inside of the gathered left and right elastically contractible gasket cuffs to form double three-dimensional gathers (barriers). In addition, human excrement is restrained and held by the barrier cuffs raised inside and not deviated outside, and the leakage of excrement from the diaper is reduced by the double and three-dimensional gathers described above. Or was intended to be delayed.

However, the above-mentioned diaper has a drawback that urine absorbed by the absorbent core returns to the top sheet and leaks out from the end of the top sheet to the abdomen or back side. However, since the skin came into wide contact with the skin, the wearer felt a feeling of squeezing and discomfort.

In the above-mentioned diaper, a gasket cuff and a barrier cuff are raised by elastic elastic members attached to their respective edges to form a double three-dimensional gather during the manufacturing process. Therefore, in order to mount the elastic elastic member in the above cuff, it is necessary to turn each cuff edge into a tunnel shape by folding the cuff edge, and to seal the elastic elastic member inside the tunnel in an extended state and adhesively fix it. . The operation of folding the cuff edge and the operation of sealing the elastic elastic member to the edge in an extended state and bonding and fixing the same are time-consuming and mechanically complicated operations. Operation cannot be achieved. In addition, since it takes time to attach a pair of barrier cuffs to the inside of the pair of gasket cuffs, there is a disadvantage that the manufacturing efficiency is low in this respect as well.

[Object of the Invention] Here, the present invention prevents the reversion (wet back) of urine after urination by simple processing, and oozes and leaks urine from the end of the topsheet in contact with the diaper to the abdomen or back. It is an object of the present invention to propose a disposable diaper having a novel pocket structure that can eliminate the feeling of squeezing and discomfort of the skin, and can cover stool excreted from humans.

[Means for Solving the Problems] In order to achieve the above object, the present invention proposes a diaper having the following structure as a gist. That is, in a disposable diaper in which an absorbent core is disposed between a top sheet and a liquid-impermeable back sheet, the top sheet is formed of three sheets in a three-layer structure and a first layer. The topsheet is formed from a hydrophilic material having substantially the same length as the absorbent core and is mounted immediately above the absorbent core, and the second and third layer topsheets are both formed from a hydrophobic material. Attached on the first-layer topsheet, both side edges of the second-layer topsheet and the third-layer topsheet are adhered to both side edges of the backsheet, and the center of the second-layer and third-layer topsheet. A pocket hole for excrement dropping in the area, and a second layer and a third layer;
Between the surface sheets of the layer, a stretchable elastic member that applies a contracting force in a direction in which the pocket hole is opened is bonded to both sides of the pocket hole.

In a preferred embodiment of the present invention, the topsheet is partially formed of three sheets that can cover the absorbent core, and the topsheet of the first layer is a hydrophilic sheet having substantially the same length as the absorbent core. The surface sheets of the second and third layers are both made of a hydrophobic sheet, and a plurality of stretchable elastic bodies are provided between the second and third layer surface sheets. They are arranged in an extended state along the longitudinal direction. The hydrophobic sheet is configured to have an area covering at least 1/2 of the width of the absorbent core based on the width of the absorbent core. The opening width of the pocket hole is formed in the range of 1/6 to 1/3 of the width of the absorbent core. Further, the hydrophobic sheet has both side edges adhered and fixed to both side edges of the back sheet, and covers the excreted stool between the hydrophobic sheet and the hydrophilic sheet attached to the upper surface of the absorbent core. It forms an accommodation space.

[Invention and Specific Description] Hereinafter, the present invention will be specifically described with reference to the drawings. FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a sectional view thereof, and FIG. 3 is a perspective view showing an elastically contracted state before wearing the diaper of FIG. .

In the drawings, reference numeral 1 denotes a top sheet, 2 denotes a back sheet,
3 denotes an absorbent core interposed between the top sheet and the back sheet. The topsheet 1 is made of an absorbent core 3 as described later.
Is formed of three superposed three sheets that can partially cover the sheet. The lowermost layer of the three sheets, that is, the first layer surface sheet 1A, is made of a sheet made of a hydrophilic material formed to have substantially the same length as the absorbent core 3, and covers the upper surface of the absorbent core 3 with this. It is arranged as follows. The absorbent core 3 covered with the first layer top sheet 1A is disposed on the liquid-impermeable back sheet 2.

The second layer surface sheet 1B and the third layer surface sheet 1C
Both are made using sheets made of a hydrophobic material. The surface sheet of the second layer or the third layer made of the hydrophobic material has at least one of the same width and the same length as the product diaper, and has a central area of the second layer and the third layer sheet. A vertically long pocket hole 4 is provided for dropping an object. When a pocket hole is formed in the sheet, the surface sheet of the second layer or the third layer made of a hydrophobic material is configured to have a width that covers at least a half or more of the width S of the absorbent core 3. I do. The opening width of the pocket hole is
Set within the range of 1/6 to 1/3 of the width of the absorbent core. If the opening width l of the pocket hole is less than 1/6 of the above absorbent core width, the excrement is likely to protrude from the pocket and not be stored well in the pocket. If the core width exceeds 1/2, the area of the hydrophilic first layer top sheet exposed from the pocket holes increases, and the skin often feels squeezed and uncomfortable when urinating. By the way, in the case of infants, the length of the diaper is formed to 470-490 mm as an example, and the width of the absorbent core is 80-180 m
m is often formed. For example, when an absorbent core having a width of 150 mm and a length of 430 mm is used, it is preferable to form a pocket hole having an opening width l of 25 to 50 mm and a length of 200 to 350 mm.

In a step before or after the step of forming such pocket holes, a plurality of elastic elastic members 5 are provided between the second layer surface sheet and the third layer surface sheet along the longitudinal direction of the sheet. After being arranged in a stretched state, these are adhered to the surface sheets of the second and third layers, respectively, by using a hot melt adhesive, or by means of heat sealing, ultrasonic sealing or the like. Then, the pocket hole 4 is formed by cutting out a suitable shape having a predetermined length and width between the elastic members or a lateral position avoiding the elastic member. After the surface sheets of the second layer and the third layer configured as described above are overlapped on the surface sheet of the first layer, both side edges of one of the surface sheets of the second layer and the third layer are formed. The part is adhesively fixed to both side edges of the back sheet to obtain a finished product. In addition, the completed product is in the state shown in FIG. 3 before the elastic body 5 is contracted and worn before wearing. The details of the diaper shown in FIGS. 1 to 3 will be described below.

Absorbent core 3 interposed in the central region between liquid-permeable first layer topsheet 1A and liquid-impermeable backsheet 2
Has a substantially I-shaped planar shape as a whole, that is, an hourglass shape with the center constricted, but a rectangular absorbent core without the center constricted may be used. Then, at least one of the top sheet 1 and the back sheet 2 is extended so as to protrude laterally from both side edges in the width direction of the absorbent core to form side flaps 7 on both sides. And this side flap cuts off the center part inward,
A crotch portion 9 including an absorbent core 3 and sheets 1 and 2 covering the front and back thereof is formed in a central region. The width of the front and back sheets at both ends in the longitudinal direction is formed wider than the width between the crotch portions to form front and rear waist portions 10 and 11 that can surround the abdomen and back of the wearer. A pair of concave notches 12 for leg holes is formed in a portion confined on the inner side forming the widthwise facing side edge of the crotch portion. A fastening tape 13 is attached to both edges of the rear waist, a front reinforcing tape 14 is attached to the front waist, and waist gathers 16 and 17 are formed at both front and rear waist portions.

By the way, in the diaper of this embodiment, the topsheet 1 is formed of three layers as described above. Of these three-layer sheets, the second and third layer sheets are both formed using sheets made of a hydrophobic material, and the excrement drop pocket holes are formed in the central regions of the second and third layer sheets. The pocket hole has a function of storing and concealing the stool excreted by a human due to the contraction of the elastic elastic body 5. That is, at the four sides or at least the side positions of the pocket hole, the stretchable elastic body 5 for applying a contraction force in the direction of opening the mouth of the pocket is extended and the second layer and the third elastic body 5 are extended.
When the elastic body is contracted, as shown in FIG. 2 and FIG. 3, since the elastic body is adhered and integrated with the sheet of the layer, the surface sheet of the first layer is replaced with the surface sheet of the second and third layers. Is raised, and the surface sheet of the first layer and the second
A pocket space is formed between the face sheets of the layers to accommodate and cover the stool.

Therefore, when this diaper is worn, the hydrophilic portion in contact with the skin after urination can be limited to the limited area of the first layer surface sheet exposed from the pocket, and the outer four sides of the other pockets The second or third layer sheet is a hydrophobic material. The hydrophobic sheet fits widely along the wearer's thigh, rises in the direction opposite to the direction in which the excrement leaks out, prevents leakage in the crotch direction, and allows excrement to be separated from the skin. In addition, it is possible to prevent urine from leaking and leaking from the edge of the hydrophilic first layer top sheet to the belly or back side, so that it is possible to reduce the feeling of squeezing and discomfort of the skin in contact with the diaper. is there.

In the illustrated embodiment, about 4 to 6 elastic elastic bodies 5 are bonded and integrated between the surface sheets of the second layer and the third layer. However, a plurality of the absorbent cores may be attached in parallel at different attachment intervals, or the absorbent core may be attached such that the portions from both sides in the width direction become dense. Further, it may be mounted in a direction perpendicular to the hole outside the longitudinal end of the hole so as to surround the pocket hole, or may be mounted so that a part of the elastic body intersects (not shown). Furthermore, various design changes are possible within a range that does not impair the purpose of the present invention, such as mounting by changing the elongation rate of the elastic body and making the surface sheets of the second and third layers easily float from the surface sheet of the first layer. It is. Furthermore, the shape of the pocket hole 4 is not limited to the long hole shape shown in the above-described embodiment, but may be formed in a T-shape, a Y-shape, a cross shape, or the like.

The above is the basic configuration of the diaper applied to the present invention. Hereinafter, the materials of the components constituting the diaper will be briefly described.

First, the absorbent core 3 disposed between the front and back double-sided sheets 1 and 2 is generally a laminate of an absorbent sheet such as a tissue paper or a dry pulp nonwoven fabric on the upper and lower surfaces. The space is composed of two or more layers of absorbent fiber layers such as flap pulp and rayon. Highly water-absorbing particulates may be provided between the layers of the absorbent core. The superabsorbent granules referred to here are generally known superabsorbent polymer particles alone or granules obtained by mixing activated carbon, carboxymethylcellulose, zeolite, or the like.

As the hydrophobic sheet used in the present invention, a hydrophobic nonwoven fabric using polypropylene fiber, polyester fiber, polypropylene polyethylene composite fiber, polyester polyethylene composite fiber, or the like is frequently used. The portion in contact with the wearer's groin urination position is subjected to a hydrophilic treatment in order to impart water permeability. Instead of this hydrophobic nonwoven fabric, a water-repellent treatment was applied to the area other than the part in contact with the wearer's urination position using a perforated plastic sheet with small holes at the urination position or using a hydrophilic dry nonwoven fabric. Things can be used.

As the liquid-impermeable back sheet, polyethylene film, hydrophobic non-woven fabric and the like can be used. In addition, the second
The elastic elastic body 5 disposed between the layer and the surface sheet of the third layer and between the front and back sheets is made of natural or synthetic rubber, urethane or the like thread, string, or band. The sheet is fixed between the front and back sheets by means of an adhesive, heat sealing, ultrasonic sealing, or the like.

[Effects of the Invention] According to the diaper configuration of the present invention described above, the pocket hole for water permeability provided in the central region of the hydrophobic sheet accommodates the stool excreted from a human due to the contraction of the elastic elastic body. It also functions as a storage space that can be concealed. The part in contact with the skin after urination can be stopped at the part of the hydrophilic sheet of a limited area exposed from the pocket, and the other four sides of the pocket holes are separated from the skin by a hydrophobic material on the outside of the pocket hole. Therefore, it is possible to prevent urine from returning from the absorbent core (wet back). Moreover, since it is possible to prevent the hydrophilic surface sheet attached to the upper surface of the absorbent core from leaking to the belly or back side from the end of the hydrophilic surface sheet, it is possible to reduce the feeling of squeezing and discomfort of the skin in contact with the diaper. Can be.

Therefore, it is possible to produce a disposable diaper having a simpler structure than the conventional diaper forming double three-dimensional gathers and having extremely little leakage and discomfort when worn.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a sectional view thereof, and FIG. 3 is a perspective view showing an elastically contracted state before wearing the diaper of FIG. . 1: Top sheet, 1A: First layer top sheet, 1B: Second layer top sheet, 1c: Third layer top sheet, 2: Back sheet, 3: Absorbent core, 4: Pocket hole, 5: Elastic body , 7: side flap, 9: crotch, 10: front waist, 11: rear waist, 1
2: Recessed hole for leg hole, 13: fastening tape, 14: front reinforcing tape, 16, 17: waist gather, 18: auxiliary absorber

Claims (4)

(57) [Claims] 1. A disposable diaper having an absorbent core disposed between a top sheet and a liquid-impermeable back sheet, wherein the top sheet is formed of three sheets in a three-layer structure, The first layer topsheet is formed from a hydrophilic material having substantially the same length as the absorbent core and is mounted immediately above the absorbent core, and both the second layer topsheet and the third layer topsheet are formed from a hydrophobic material. And attached to the first layer surface sheet, and both side edges of the second layer surface sheet and the third layer surface sheet are adhered to both side edges of the back sheet. A pocket hole for excrement dropping is provided in a central area of the topsheet, and a second layer and a third layer are formed.
A disposable diaper having a pocket structure in which a stretchable elastic body which applies a contraction force in a direction in which the pocket hole is opened is bonded to both sides of the pocket hole between surface sheets of the layer. 2. The surface sheet according to claim 1, wherein the second layer surface sheet and the third layer surface sheet made of a hydrophobic material have a width covering at least half the width of the absorbent core. Disposable diapers with pocket structure. 3. The disposable diaper having a pocket structure according to claim 1, wherein an opening width of the pocket hole is in a range of 1/6 to 1/3 of a width of the absorbent core. 4. A first layer surface sheet made of a hydrophilic material,
The disposable having the pocket structure according to any one of claims 1 to 3, wherein an accommodation space for covering the excreted stool is formed between the second layer surface sheet made of a hydrophobic material and the second layer surface sheet. Diapers.