JP2565493C - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Object of the Invention [Industrial Application Field] The present invention relates to a disposable diaper, particularly to a diaper characterized by a structure for preventing excrement from leaking. (Prior art) Conventionally, a disposable diaper having no side flaps that softly contact around the wearer's legs, in which the opposite side of the water-impermeable back sheet located on the lower surface of the absorbent core covers the opposite side of the core. Japanese Patent Application Laid-Open No. H10-284,197 discloses that a polyurethane foam elastic band for forming a gather in the longitudinal direction is arranged on the opposite side edge of the water-permeable top sheet located on the upper surface of the core in a planar manner. It is disclosed in JP-A-54-10050. The gist of the invention according to this application is that in order to reduce the elasticity of the elastic band from being restrained by the rigidity of the core, each part of the top sheet and the back sheet at the site where the band is adhered is the core. Is to be free from On the other hand, a disposable diaper having side flaps that are in soft contact with the wearer's legs, wherein an elastic band made of polyurethane foam that forms a gather in the longitudinal direction of the flaps is folded in a plane in the width direction, or is folded in an annular cross section. What has been disclosed is disclosed in JP-A-57-89602. The gist of the invention according to this application is to improve the air permeability through the elastic band, give the band a cushioning property, interpose and bond between the water-permeable top sheet and the water-impermeable back sheet, and bond the band. The point is that the top sheet portion of the portion to be pressed is pressed against the skin. [Problems to be Solved by the Invention] In general, in a disposable diaper, the absorbent core is mainly composed of cotton-like pulp, but in order to improve the absorbability, high absorbent polymer particles are mixed, Embossing is also given. However, the absorption rate of the top sheet and the core is not high enough to absorb urine at once as soon as urine is excreted on the upper surface, so that urine flows in the lateral direction on the upper surface of the sheet and the diaper. May leak from the opposite side edge of the It goes without saying that such leakage is more likely to occur as the amount excreted at a time is relatively large. By the way, in the former diaper, the elastic band was elastically pressed around the wearer's leg around the wearer's leg to prevent leakage of excrement only by pressing the elastic band around the wearer's leg. If the condition is any bad, or if the wearer moves to a certain posture, a gap is likely to be formed between the band portion and the skin. Therefore, not only the flowing urine but also the 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 leg due to its elasticity and cushioning property, the top sheet portion where the band is located is protruded and tends to be relatively well in contact with the skin. And is superior to the former diaper in preventing leakage. However, since the top sheet in 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 of both diapers by providing a levee function having a three-dimensional elastic structure to a side flap portion where the elastic band is located. It is to provide disposable diapers that can be made. The main object of the second invention is to provide the same embankment function as the side flap portion on the upper edge of the absorbent core on the opposite side, in addition to the object of the first invention, An object of the present invention is to provide a disposable diaper that can more effectively prevent leakage of excrement of both diapers. In addition, in the conventional diapers, the portion where the elastic band is located does not have a levee function, as is clear from the respective gist and the problem, and a description suggesting that. Nor. Accordingly, they will be understood as not teaching the invention in any way. (2) Configuration of the Invention [Means for Solving the Problems] The first aspect of the present invention relates to an absorbent core having a required thickness, a water-permeable top sheet covering at least the upper surface of the core, An impermeable backsheet covering at least the lower surface, an impermeable side flap extending outward from a lower edge on the opposite side of the core, and a leak-proof embankment forming a stretchable gather in the length direction of the side flap. The side flaps extend outward from a lower edge of the opposite side of the core;
And an impermeable side sheet joined to the upper surface of the back sheet portion.
And a protrusion formed by a part of the side sheet and having a height of at least 3 mm and located between inner and outer edges in the width direction of the side flap; and an upper edge of the protrusion is composed of a Elastica Chick band located along the side sheet, there is provided a disposable diaper, characterized in that covers the side situated on the side of the core from the side flaps. A second aspect of the present invention provides an absorbent core having a required thickness, a water-permeable topsheet covering at least an upper surface of the core, a water-impermeable backsheet covering at least a lower surface of the core, and an opposing side of the core. Impermeable side flaps extending outwardly from a lower edge of the first flap, a first leak-proof embankment forming a telescopic gather along the length of the side flaps, and a length at an upper edge on an opposite side of the core. A second leak barrier that creates telescopic gathers in the direction, wherein the side flaps have impermeable side sheets that form a part thereof, and the first leak barrier is one side of the side sheets. A protruding portion formed between the inner and outer edges in the width direction of the side flap having a height of at least 3 mm, and an elastic band positioned along an upper edge of the protruding portion; The second breakwater is the side sheet A part is formed and has a height of at least 3 mm and is formed of a protrusion located at the upper edge of the core, and an elastic band positioned along the upper edge of the protrusion, and the side sheet includes: A disposable diaper characterized by covering a side portion of the core. [Example] Further, the present invention will be described based on the illustrated embodiment with reference to the drawings.
It is as follows. a) First Invention As shown in FIGS. 1 and 2, the diaper comprises an absorbent core 1 having a required thickness, a water-permeable top sheet 2, a water-impermeable back sheet 3, and a water-impermeable And a leak-proof embankment 5 located between the inner and outer edges in the width direction of the side flap, 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. Back sheet 3
It covers the lower surface of the core 1 and extends outward from the periphery of the core 1. The side flap 4 includes an extension 3b on the opposite side of the back sheet 3 and an impermeable sheet 6 joined to the upper surface thereof. The inner portion 6a of the side sheet 6 is joined to the top sheet 2 covering the opposite side of the core 1. A part of the side sheet 6 that forms a part of the side flap 4 has an inverted U.
An elastic band 8 which projects in a shape or an Ω shape, and which extends and contracts in the length direction of the projecting portion 7 is integrally bonded and interposed, and is formed by projecting on the upper surface of the side flap 4. The height H1 of the leak preventer 4 from the upper surface of the side flap 4 is 3 to 30.
mm, preferably 5 to 20 mm. The elastic band 8 is formed by bending a tape of rubber or polyurethane foam into an inverted U shape in the width direction, and is located in the upper half portion of the protrusion 7. However, as long as the elastic band 8 has elasticity, it does not matter whether it is made of any material or shape, and it does not matter whether it is located in the upper half part of the protruding part 7 or located in the whole. It is preferably located at the top. In any of these materials, forms and positions, the leak-proof embankment 5 keeps protruding from the upper surface of the side flap 4.
The tension caused by a certain amount of expansion or contraction of the elastic band 8 (the band 8 is adhered to the projection 7 and does not completely restore the contraction), and the contraction of the leak-proof embankment 5 is caused by the contraction. It depends on your tendency. However, it is preferable that both ends in the length direction of the leak-proof embankment 5 are outwardly laid down.
This is because the inclination between the two ends is provided with an outward inclination tendency, and the inward inclination tendency is prevented before wearing the diaper. As shown in FIG. 1, the leak preventive embankment 5 is generally formed so that the rear area is wider than the front area of the diaper, but the diaper conforms to the form so that the diaper fits the wearer's body. Therefore, it is preferable that the distance between the opposed sides is wider in the rear area than in the front area of the diaper. The core 1 has an absorbent holding layer 9 in which superabsorbent polymer particles (not shown) are mixed in a cotton-like pile or a fiber web or a nonwoven fabric, and has a lower density, more space, and a greater wetness. The lower insulating layer 10 is a fiber web having a high compression elastic recovery rate. The separating layer 10 is located between the top sheet 2 and the absorption / retention layer 9 to isolate the both, so that the excretion liquid can be quickly transmitted through the separation layer, while the excretion liquid absorbed by the absorption / retention layer 9 can be removed. The backflow on the upper surface of the absorption holding layer is less likely to leak to the top sheet 2 and the core 1 is provided with cushioning properties so that the wearer does not feel rigid.
It has such a function. In order to sufficiently have such a function, it is preferable that the separating layer 10 maintains a web form by fusing fibers having a length of 35 to 100 mm at intersections. As the fiber, a hydrophobic fiber, preferably a fiber having at least 50% by weight of water absorbency (so-called sweat absorbency), particularly a sweat absorbable polyester fiber is used. To facilitate fiber fusion, polyester fiber, polyethylene fiber, polypropylene fiber, polyethylene / polypropylene with low melting point (110-200 ° C)
It is preferred to contain at most 30% by weight of low-melting polyester / normal polyester conjugate fibers (side-by-side, core-sheath type). The thickness of the isolation layer 10 is 2 to 10 mm after a load of 3 g / cm2 is applied for 1 minute, and the basis weight is 20 to 80 g.
/ M 2, the compressive elastic recovery 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 form, and has regular openings 11 throughout to improve the permeability of excreted liquid. Is formed by It is preferable that the opening 11 has a clear contour in which no fiber crosses the inside of the opening. Such a top sheet 2 is obtained, for example, by a method in which a fiber web is guided to a support having a group of projections, and a high-speed water stream is jetted from the upper surface to entangle the fibers and distribute the fibers to the periphery by the group of projections. The apertures 11 each have an area of 7 to 50 mm2, a circular shape has a diameter of 2 to 10 mm, an arrangement pitch of 6 to 20 mm, and a total aperture ratio of 15 to 70% with respect to the total surface area.
It is preferred that The topsheet 2 is configured so that the surface of the non-opening portion is not wetted by bodily fluid such as urine or sweat and the bodily fluid is permeated, and is treated with a known water repellent. 70% by weight of rayon fiber with fineness of 0.5-3d
Most preferably, it is used as described above. However, the water-absorbing fiber or the ordinary hydrophobic fiber may be used in an amount of 70% by weight or more, and the most preferable of these fibers 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 / m 2. The back sheet 3 is formed of a plastic film having liquid permeability and a laminate of the plastic film and the nonwoven fabric. The water-impermeable side sheet 6 forming a part of the side flap 4 is preferably a nonwoven fabric, preferably a breathable sheet obtained by subjecting a spunbonded nonwoven fabric made of polypropylene to a water-repellent treatment. Such a diaper is assembled and worn by fixing the free end of a tape fastener 12 provided on the opposite side of the waist in the rear area to the opposite side of the back sheet 2 in the front area, similarly to the known disposable diapers. b) Second Embodiment of the Present Invention As shown in FIGS. 1, 3 and 4, the diaper includes a second leak barrier 12 in addition to the above-described first embodiment of the present invention. A part of the saddle sheet 6 forming a part of the side flap 4 is formed by a reverse U.
A second elastic band 14 that protrudes in a shape or an Ω shape and that extends and contracts in the length direction of the protruding portion 13 is integrally bonded and interposed, and is formed by protruding from the upper edge of the opposite side of the core 1. ing. The protruding portion 13 is joined to the top sheet 2 whose inside is located on the opposite side of the core 1, and the joining needs to be made at least near the upper end. The height H2 of the leak preventer 12 from the upper surface of the top sheet 2 located on the upper edge of the core 1 on the opposite side is 3 to 20 mm, preferably 5 to 15 mm. The leak-proof embankment 12 shown in FIG. 4 is bent inward near the upper end and located on the upper surface on the opposite side of the core 1. In this case, at least the upper surface of the top sheet 2 located on the upper surface is provided. Preferably, they are joined. The other points and other components of the breakwater 12 are exactly the same as those of the first embodiment of the present invention. In addition, as shown in FIG. 1, the leak preventers 5 and 12 extend to near the opposite end of the diaper, but may be provided at least in the crotch area. (3) Effects of the Invention a) First Invention According to the present invention, even when 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 a water-impermeable sheet. So that it does not leak from the opposite side of the core. In addition, 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 flap located outside the core, the flap is formed with a gather and is elastically pressed against the leg around the water-impermeable material. Is located, so that it is blocked by the levees and leaks very little from the opposite side edge of the diaper. The leak barrier generally tilts or falls down outward due to the body pressure of the wearer, but has a propensity to stand up due to the action of the elastic band located in the leak barrier, so that it separates from the skin and leaves a gap between it and the skin. It is extremely rare. b) Second Invention According to the present invention, since the second leak barrier having the same function as that of the leak barrier is located on the upper edge of the core on the opposite side, the excreted liquid is discharged from the core. Even if it overflows on the upper surface and flows to the upper edge on the opposite side, it is blocked by the leak preventer. In addition, even if the spill flows out of the leak barrier into the side flaps located outside the levee, in this case, the amount of excreted liquid and the excreted part are the same under the same conditions as in the case of the first diaper of the present invention. If so, the amount of the outflow is extremely small as compared with the latter case, but the outflowing excretion is also blocked by the above-described leak barrier located on the side flap. Therefore, leakage from the opposite side edge of the diaper is almost certainly prevented. In addition, since the breakwaters are doubly positioned on the inner and outer sides in this manner, the upper surface (inner surface) of the diaper is simply compared to a known disposable diaper in which a flat elastic band is provided on the side flap. Is less likely to come into contact with the skin, and therefore the skin is less likely to be wet by the inner surface wetted by the excreted liquid.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a developed plan view showing first and second diapers of the present invention, and FIG.
FIG. 1 is a cross-sectional view taken along the line XX of the first diaper of the present invention, FIG. 3 is a cross-sectional view taken along the line XX of FIG. 1, showing the second diaper of the present invention, and FIG. FIG. 1 is a sectional view taken along the line XX of FIG. 1 showing another example of the diaper of the present invention. DESCRIPTION OF SYMBOLS 1 ... Core 2 ... Top sheet 3 ... Back sheet 4 ... Side flap 5 ... Leak-proof levee 6 ... Water-impermeable sheet 7 ... Projection part 8 ... Elastic Band 12: Leakage barrier 13 ... Projection 14: Elastic band

Claims (1)

Claims: 1. An absorbent core having a required thickness, a water-permeable top sheet covering at least an upper surface of the core, and a water-impermeable back sheet covering at least a lower surface of the core.
An impermeable side flap extending outwardly from a lower edge of the opposite side of the core, and a leak-proof embankment forming a telescopic gather in a length direction of the side flap ; The bag extending outward from the lower edge of
And a water-impermeable side sheet joined to an upper surface of the back sheet portion.
The leakage barrier is formed by a part of the side sheet, has a height of at least 3 mm, and is located between the inner and outer edges in the width direction of the side flap; It is composed of a Elastica Chick band located along the upper edge, the side sheet, a disposable diaper, characterized in that covers the side situated on the side of the core from the side flaps. 2. The diaper according to claim 1, wherein the leak-proof embankment is formed by projecting a part of the side sheet in an inverted U shape or an Ω shape. 3. The diaper according to claim 1, wherein an interval between the leakage-prevention embankments is wider in a rear area than in a front area of the diaper. 4. An absorbent core having a required thickness, a water-permeable topsheet covering at least an upper surface of the core, and a water-impermeable backsheet covering at least a lower surface of the core.
An impervious side flap extending outwardly from a lower edge on the opposite side of the core, a first leak-proof embankment forming a telescopic gather along the length of the side flap, and an upper edge on the opposite side of the core. A second leak-proof embankment that has a telescopic gather in its length direction, wherein the side flap has an impermeable side sheet forming at least a part thereof; A protrusion formed by a part of the side sheet and having a height of at least 3 mm and located between inner and outer edges in the width direction of the side flap; and an elastic band located along an upper edge of the protrusion. The second breakwater is formed by a part of the side sheet and has a height of at least 3 mm and is located at the upper edge of the core; Consists of an elastic band located along the edge It is, the side sheet, a disposable diaper, characterized by covering the sides of the core. 5. The first and second leak barriers are each formed by projecting a part of the side sheet in an inverted U shape or in an Ω shape.
Diapers described in the section. 6. The diaper according to claim 4, wherein an interval between the first leak-proof breakwaters is wider in a rear area than in a front area of the diaper.