JP2565493B2 - Disposable diapers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Object of the Invention [Industrial field of use] The present invention relates to a disposable diaper, and more particularly to a diaper characterized by a structure for preventing leakage of excrement.

[Conventional technology]

Conventionally, a disposable diaper that does not have a side flap that softly contacts the wearer's legs, and the opposite side of the water-impermeable backsheet located on the lower surface of the absorbent core is bent upward so as to cover the opposite side of the core. Moreover, an elastic band made of polyurethane foam, which gathers in the longitudinal direction of the water-permeable topsheet located on the upper surface of the core, is arranged flat on the opposite side edges thereof.
-10050. The gist of the invention according to this application is to reduce the stretchability of the elastic band from being restrained by the rigidity of the core, so that each part of the topsheet and the backsheet at the part to which the band is bonded is the core. The point is that I was free to.

On the other hand, a disposable diaper having side flaps that softly contact the wearer's legs, wherein an elastic band made of polyurethane foam that gathers in the longitudinal direction of the flap is folded flat in the width direction or is folded in an annular cross section. This is disclosed in JP-A-57-89602. The gist of the invention pertaining to this application is
The elastic band is made to have good breathability, and the band is provided with cushioning properties so as to be interposed between the water-permeable top sheet and the water-impermeable back sheet, and the top sheet portion where the band is adhered is the skin. The point is that they are pressed against.

[Problems to be solved by the invention]

Generally, in disposable diapers, the absorbent core is
The main material is cotton-like pulp, but in order to improve its absorbability, super absorbent polymer particles are mixed or embossed. However, the absorption rate of the top sheet and the core is not so high as to absorb urine all at once once it is excreted on the top surface, so that urine flows laterally on the top surface of the sheet. May leak from the opposite edge of the. It goes without saying that such leakage is more likely to occur as the amount of excreted at one time is relatively large.
By the way, in the former diaper, since the elastic band prevents the leakage of excrement only by pressing the elastic band around the wearer's leg in a planar manner due to its elasticity, the diaper was worn. If the condition is a little bad or the wearer moves to a certain posture, a gap is likely to be formed between the band and the skin. Therefore, not only the flowing urine but also fluid stool (soft stool) may leak from the gap.

On the other hand, in the latter diaper, since the elastic band is pressed against the wearer's legs due to its elasticity and cushioning property, the top sheet portion in which the band is located tends to be raised and relatively well contact with the skin. There is
The former is better than the diaper in preventing leakage. However, since the top sheet that comes into contact with the skin is water-permeable, its prevention is still insufficient.

The first main object of the present invention is to effectively prevent leakage of excrement contained in the diapers of the two by giving a levee function having a three-dimensional stretchable structure to the side flap portion where the elastic band is located. It is to provide a disposable diaper that can.

The main purpose of the second aspect of the present invention is to provide the same levee function as the side flap portion to the upper edge of the absorbent core on the opposite side, in addition to the above-mentioned purpose of the first aspect of the present invention. It is an object of the present invention to provide a disposable diaper that can more effectively prevent leakage of excrement contained in both diapers.

In both of the conventional diapers, as is clear from the above-mentioned main points and problems, the portions in which the respective elastic bands are located do not have a levee function, and a suggestion therefor. Nor. Therefore, it should be understood that they do not teach the present invention.

(2) Configuration of the Invention [Means for Solving the Problems] The first aspect of the present invention is directed to an absorbent core having a required thickness, a water-permeable topsheet that covers at least the upper surface of the core, and the core. It includes a water-impermeable backsheet that covers at least the lower surface, a water-impermeable side flap that extends outward from the lower edge of the core on the opposite side, and a leak preventive dike that forms a stretchable gather in the lengthwise direction of the side flap. , The side flap has an impermeable side sheet forming a part thereof,
The leak-proof embankment is formed by a part of the side sheet, has a height of at least 3 mm, and is located between inner and outer edges in the width direction of the side flap, and along the upper edge of the projection. In the disposable diaper, the side sheet covers the side portion of the core.

A second aspect of the present invention provides an absorbent core having a required thickness, a water-permeable topsheet that covers at least an upper surface of the core, a water-impermeable backsheet that covers at least a lower surface of the core, and an opposite side of the core. A water-impervious side flap that extends outward from the lower edge of the core, a first leak preventive dike that forms a stretchable gather in the lengthwise direction of the side flap, and the length of the core at the upper edge on the opposite side of the core. A second breakwater that makes a stretchable gather in a direction, the side flaps have impermeable sidesheets forming a part thereof, and the first breakwater is one of the sidesheets. A protrusion formed between the inner and outer edges of the side flap in the width direction and having a height of at least 3 mm, and an elastic band located along the upper edge of the protrusion, The second breakwater is one of the side sheets. A protrusion positioned on the upper edge of the core but has a height of forming at least 3 mm,
The disposable diaper is characterized in that it comprises an elastic band located along the upper edge of the projecting portion, and the side sheet covers the side portion of the core.

〔Example〕

Further, the present invention will be described below based on the illustrated embodiments with reference to the drawings.

a) First invention of the present invention As shown in FIGS. 1 and 2, the diaper has an absorbent core 1 having a required thickness, a water-permeable top sheet 2, a water-impermeable back sheet 3, and a water-impermeable material. Sex side flaps 4
And the leak preventive dike 5 located between the inner and outer edges of the side flap in the width direction, that is, in the vicinity of the outer edge.

The top sheet 2 covers the upper surface and the peripheral side of the core 1. The backsheet 3 covers the lower surface of the core 1 and
It extends outward from the peripheral edge of the core 1. The side flap 4 includes an extending portion 3b on the opposite side of the back sheet 3 and a water impermeable sheet 6 joined to the upper surface thereof. Side seat 6
The inner portion 6a of the above is joined to the top sheet 2 covering the opposite side of the core 1.

The leak-proof dike 5 has an elastic band 8 in which a part of the side sheet 6 forming a part of the side flap 4 projects in an inverted U shape or an Ω shape, and expands and contracts in the longitudinal direction within the projecting portion 7.
Are integrally bonded and interposed, and are formed by projecting on the upper surface of the side flap 4. Side flaps 4
The height H1 of the leak preventive dike 4 from the upper surface is 3 to 30 mm, preferably 5 to 20 mm. The elastic band 8 is located in the upper half of the protrusion 7 by bending a rubber or polyurethane foam tape in an inverted U shape in the width direction. However, as long as the elastic band 8 is stretchable, it does not matter whether it is made of a material or a shape, and whether it is located in the upper half of the protrusion 7 or the whole thereof, at least It is preferably located at the top. In any of these materials, forms and positions,
The leak preventer 5 remains projecting on the upper surface of the side flap 4, which is due to the rigidity (waist) of the projection 7 and some extension or contraction of the elastic band 8 (where the band 8 extends over the projection 7). (Because they are adhered, they do not completely contract and restore), and the tendency of the leakproof dike 5 to curve upward in accordance with the contraction. However, it is preferable that both ends in the lengthwise direction of the leak preventive dike 5 are laid down to the outside, but when this is done, a portion between the both ends is provided with an inclination tendency to the outside. This is because the prone tendency to fall inside when the diaper is worn is prevented. As shown in FIG. 1, the leak-proof dike 5 is generally formed so that its rear region is wider than its front region, but its shape allows the diaper to fit the wearer's body. In order to
It is preferable that the opposing side interval is formed wider in the rear region than in the front region of the diaper.

The core 1 has an absorbent / retaining layer 9 in which super absorbent polymer particles (not shown) are mixed in a cotton-like pile, a fibrous web or a non-woven fabric, and has a lower density and a large amount of space and is wet. It consists of a separating layer 10 which is a fibrous web having a high compression elastic recovery rate. The isolation layer 10 is the top sheet 2
Is located between the absorption holding layer 9 and
While excreted liquid quickly permeates the isolation layer, the excreted liquid absorbed in the absorbent holding layer 9 is prevented from flowing back to the upper surface of the absorbent holding layer and exuding to the top sheet 2, and further, the core 1 has a cushioning property. To give the wearer a sense of rigidity. In order to have such a function sufficiently, it is preferable that the separating layer 10 maintain a web form by fusion of fibers having a length of 35 to 100 mm at the intersections. As the fiber, a hydrophobic fiber, preferably at least 50% by weight of which has a water absorbing property (so-called sweat absorbing property), particularly a sweat absorbing polyester fiber is used. A low melting point (110-200 ℃) to facilitate fiber fusion
It is preferable that the polyester fiber, polyethylene fiber, polypropylene fiber, polyethylene / polypropylene / low melting point polyester / normal polyester conjugate fiber (side-by-side, core-sheath type) and the like are contained at a maximum of 30% by weight. The thickness of the isolation layer 10 is 2 to 10 mm after applying a load of 3 g / cm2 for 1 minute, and the basis weight is 20 to 80 g / m.
2. The compression elastic recovery rate in the wet state is 30% or more, preferably 50% or more, and the fineness is 3 to 13d.

The top sheet 2 has fibers 11 entangled with each other to maintain a non-woven fabric shape, and has regular openings 11 throughout to improve the permeability of excreted liquid, and the openings 11 have fibers distributed therein. Is formed by. The apertures 11 preferably have apparently a clear contour with no fibers traversing the apertures. Such a top sheet 2 can be obtained by, for example, a method in which a fiber web is guided to a support having projections, and a high-speed water stream is jetted from the upper surface to entangle the fibers and distribute the fibers to the surroundings by the projections. The apertures 11 preferably have an area of 7 to 50 mm 2, a circular diameter of 2 to 10 mm, an arrangement pitch of 6 to 20 mm, and a total aperture ratio of 15 to 70% based on the total surface area. The top sheet 2 is configured so that the surface of the non-opened portion does not get wet with body fluid such as urine and sweat, and the body fluid permeates through the top sheet 2, and is treated with a known water repellent. Most preferably, 70% by weight or more of rayon fiber having a fineness of 0.5 to 3d is used as the fiber. However, 70% by weight or more of the water-absorbing fiber or the ordinary hydrophobic fiber may be used, and the most preferable fiber is a polyester fiber having a fineness of 1 to 3d. The basis weight of the top sheet 2 is generally 15 to 45 g / m2.

The back sheet 3 is made of a plastic film having a breathable liquid-proof property or a laminate of the plastic film and a fibrous nonwoven fabric.

The water-impermeable side sheet 6 forming a part of the side flap 4 is preferably a non-woven fabric, preferably a spun-bonded non-woven fabric of polypropylene, which is water-repellent and has breathability.

These diapers, like known disposable diapers,
Tape fastener 12 on opposite side of waist in back area
It is assembled and worn by fixing its free end to the opposite side of the backsheet 2 in the front region.

b) Second Invention As shown in FIGS. 1, 3 and 4, the diaper includes a second leak preventer 12 in addition to the configuration of the first invention described above.

In the leak-proof dike 12, a part of the saddle sheet 6 forming a part of the side flap 4 protrudes in an inverted U shape or an Ω shape,
A second elastic band 14 that expands and contracts in its length direction is integrally adhered and interposed in 13 and is formed by protruding from the upper edge of the core 1 on the opposite side. It is necessary that the inside of the protrusion 13 is joined to the top sheet 2 located on the opposite side of the core 1, and the joining is made at least near the upper end. The height H2 of the leakproof dike 12 from the upper surface of the top sheet 2 located at the upper edge of the core 1 on the opposite side is 3
-20 mm, preferably 5-15 mm. The leak-proof dike 12 shown in FIG. 4 is bent inward in the vicinity of its upper end and is positioned on the upper surface of the core 1 on the opposite side. In this case, at least on the upper surface of the top sheet 2 positioned on the upper surface. It is preferably bonded. Other points and other components of the breakwater 12 are exactly the same as those of the first invention described above.

As shown in FIG. 1, the breakwaters 5 and 12 extend near the opposite ends of the diaper, but may be provided at least in the crotch area.

(3) Effects of the Invention a) According to the first aspect of the present invention, even if the excreted liquid is absorbed by the core and reaches the opposite side edge of the core, the opposite side of the core is covered with the impermeable sheet. Since it is covered, it will not leak from the opposite side of the core. Further, even if the excreted liquid overflows on the upper surface of the core before it is absorbed by the core and flows out to the side flaps located on the outer side of the core, the flap is gathered and elastically pressed around the legs. Since the breakwater with is located,
It is blocked by the leak-proof dike, and leaks from the opposite side edges of the diaper are extremely small. The leak-prevention bank generally tilts or lays outward due to the body pressure of the wearer, but since it has an erecting tendency due to the action of the elastic band located inside the leak-prevention bank, there is a gap between the skin and the skin. Very few are produced.

b) Second invention According to the present invention, since the second breakwater having the same function as the above-mentioned breakwater is located at the upper edge on the opposite side of the core,
Even if the excreted liquid overflows on the upper surface of the core and flows to the upper edge on the opposite side, it is blocked by the leak preventer. In addition, even if it flows over the side wall located on the outside of the leak barrier, in this case, the amount of excreted liquid and excretion site are the same as in the case of the first diaper of the present invention. If there is, the amount of outflow is extremely small compared to the latter case, but the discharged excretory liquid is also blocked by the above-mentioned leak-proof dike located at the side flap. Therefore, leakage from the opposite side edges of the diaper is almost certainly prevented. In addition, since the leak-proof dike is double located inside and outside, the upper surface (inner surface) of the diaper is simpler than that of a known disposable diaper in which a flat elastic band is simply provided on the side flaps. Is less likely to come into contact with the skin, and therefore the skin is less likely to be wetted by the inner surface wetted with the excretion liquid.

[Brief description of drawings]

FIG. 1 is a developed plan view showing the first and second diapers of the present invention, FIG. 2 is a sectional view taken along line XX of FIG. 1 showing the first diaper of the present invention, and FIG. FIG. 1 is a sectional view taken along line XX of FIG. 1 showing a diaper according to the second aspect of the present invention, and FIG. 4 is a sectional view taken along the line XX of FIG. 1 showing another example of the diaper according to the second aspect of the present invention. 1 ... Core, 2 ... Topsheet, 3 ... Backsheet, 4 ... Side flaps, 5 ... Leakage barrier, 6 ... Impermeable sheet, 7 ... Projection part, 8 ... Elastic band, 12 …… Leakage barrier, 13 …… Projection part, 14 …… Elastic band

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP 57-210003 (JP, A) JP 59-25741 (JP, A) JP 59-146651 (JP, A) Actual 60- 169204 (JP, U)

Claims (6)

(57) [Claims] 1. An absorbent core having a required thickness, a water-permeable topsheet that covers at least an upper surface of the core, a water-impermeable backsheet that covers at least a lower surface of the core, and a lower edge of an opposite side of the core. Includes a water-impermeable side flap extending outwardly from the side flap, and a leak-proof embankment that forms a stretchable gather in the lengthwise direction of the side flap, the side flap includes a water-impermeable side sheet forming at least a part thereof. The leak preventer has a protrusion formed by a part of the side sheet and has a height of at least 3 mm, and is located between inner and outer edges in the width direction of the side flap, and above the protrusion. A disposable diaper characterized by comprising an elastic band located along an edge, and the side sheet covers a side portion of the core. 2. The diaper according to claim 1, wherein the leak preventer is formed by a part of the side sheet protruding in an inverted U shape or an Ω shape. 3. The diaper according to claim 1, wherein the distance between the leak preventive walls facing each other is wider in the rear region than in the front region of the diaper. 4. An absorbent core having a required thickness, a water-permeable topsheet that covers at least the upper surface of the core, a water-impermeable backsheet that covers at least the lower surface of the core, and a lower edge of the core on the opposite side. Watertight side flaps extending from the outside to the first side, first leak-blocking levee that creates stretchable gathers in the lengthwise direction of the side flaps, and stretchable in the lengthwise direction at the upper edge of the opposite side of the core. A second leak preventer for forming a gather, the side flap has an impermeable side sheet forming at least a part thereof, and the first leak preventer has a part of the side sheet. A protrusion that is formed between the inner and outer edges of the side flap in the width direction and has a height of at least 3 mm, and an elastic band that is located along the upper edge of the protrusion, The side wall of the leakage barrier A part formed to have a height of at least 3 mm and located at the upper edge of the core, and an elastic band located along the upper edge of the projection, the side sheet, A disposable diaper, characterized in that it covers the sides of the core. 5. The diaper according to claim 4, wherein the first and second leak preventers are formed by protruding a part of the side sheet in an inverted U shape or an Ω shape. . 6. The diaper according to claim 4, wherein the facing interval of the first breakwater is wider in the rear region than in the front region of the diaper.