JP3183357B2 - Disposable diapers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention prevents a liquid permeable topsheet, a leakage prevention sheet, relates a disposable diaper having an absorbent body located between these two sheets, in particular, the leakage from the waist Related to disposable diapers.

[0002]

2. Description of the Related Art A conventional disposable diaper is formed vertically from a liquid-permeable top sheet, a liquid-impermeable leak-proof sheet, and an absorber interposed between these sheets.
The dimensions of the topsheet and the leak-proof sheet in the longitudinal direction are substantially the same, and both ends in the longitudinal direction are substantially aligned. Further, since the topsheet is hydrophilic, in general, when a large amount of urine is excreted or when the excreted posture is prone, leakage from the waist easily occurs along the topsheet.

[0003] As a measure to prevent such leakage, at the end of the absorber,
There is known a technique for preventing leakage from a waist portion by arranging a liquid-impermeable film or a hydrophobic nonwoven fabric and forming a so-called waist barrier (first conventional technique). In addition, there is known a technique in which gathers are provided at a waist portion to enhance fit to a body to prevent leakage from the waist (second conventional technique). Further, a technique using both the above-described first conventional technique and the second conventional technique is known (third conventional technique). Furthermore,
It is known that a hydrophobic nonwoven fabric is provided at both ends of the topsheet so as to cover the top surface of the topsheet (fourth prior art).

[0004]

However, the first prior art described above is effective in preventing leakage from the end of the absorber in the longitudinal direction, but is transmitted through the hydrophilic surface sheet on the top surface of the absorber. There is a problem that it leaks. The second prior art is effective as a means for enhancing the fit of the body, for example, it is possible to prevent the wearer's underwear from entering the diaper, but it is not enough to prevent liquid leakage. There is a problem. This is because if the tightening force of the gathers is increased, the wearer's skin will be pressed and adversely affected, so that the gathers cannot be tightened sufficiently to prevent leakage sufficiently. Furthermore, leakage of the liquid transmitted through the hydrophilic topsheet cannot be prevented.

The third prior art has a problem that, similarly to the second prior art, it is impossible to prevent leakage of a liquid transmitted through a hydrophilic surface sheet. In the fourth prior art, at first glance, it seems that leakage of the liquid transmitted through the hydrophilic topsheet can be prevented, but the hydrophobic sheet in the waist flap substantially aligns the end with the topsheet and the leakproof sheet. Since they are arranged as described above and they have a certain thickness, there is an inconvenience that leakage occurs due to bleeding from the end face of the waist flap.

Accordingly, an object of the present invention is to provide a disposable diaper capable of reliably preventing liquid from leaking from the waist.

[0007]

According to the present invention, there is provided a disposable diaper having a liquid-permeable top sheet, a leak-proof sheet, and an absorber located between the two sheets. Direction both ends are extended outside so as to be located outside the longitudinal ends of the absorbent body, and from both longitudinal ends of the leak-proof sheet, both ends of the absorbent body and both ends of the topsheet A hydrophobic sheet covering them is provided over the surface of the sheet, an elastic member is stretched on a waist flap formed by both ends of the leak-proof sheet and the hydrophobic sheet, and a waist gather is formed. , Its both ends in the longitudinal direction absorb the above
Located on the inner side of the diaper than the body,
The longitudinal end of the leak-proof sheet from the longitudinal end of the
The distance to the part is 5 to 295 mm,
Is the longitudinal direction of the absorber at its longitudinal end.
The hydrophobic sheet extends from 10 to 200 mm from the end.
Is 10 mm inward from the longitudinal end of the leak-proof sheet.
It is obtained by achieving the above objects by providing a disposable diaper characterized that you have extended more.

[0008]

When the disposable diaper of the present invention is worn, the excreted excretion is absorbed by the absorber through the topsheet, but the absorbed excrement gradually propagates on the absorber or the topsheet thereafter. Thus, the absorbent and the topsheet tend to ooze out from the edge to the waist. Since the hydrophobic sheet is disposed on the waist so as to completely cover the end including the end face of the absorbent body and the topsheet, leakage of liquid from the waist is prevented.

[0009]

EXAMPLES Hereinafter, the present invention will be described with reference to the embodiments shown in FIGS. 1 to 3 of the accompanying drawings. FIG. 1 shows the first embodiment of the present invention.
FIG. 2 is a partially cutaway plan view of the disposable diaper of the embodiment, FIG. 2 is a cross-sectional view showing a main part of the disposable diaper shown in FIG. 1 cut along line II-II, and FIG. 3 is a disposable diaper shown in FIG. FIG. 4 is a cross-sectional view of a hydrophobic sheet used for the present invention.

First, a first embodiment of the present invention will be described with reference to FIGS. Disposable diaper 1 of the first present embodiment, the topsheet 2 of liquid-permeable, leakproofness sheet 3
In the disposable diaper having the absorbent body 4 located between the two sheets, the leak-proof sheet 3 is arranged such that its longitudinal end portions 3a are located outside the longitudinal end portions 4a of the absorber. issued long extending from the respective upper Kibomo sheet longitudinal ends 3a, hydrophobic sheet 5 covering the both end portions 4a and the surface of both end portions 2a of the topsheet of the absorbent body is provided, the barrier sheet And a waist flap 11 consisting of an end of a hydrophobic sheet and an elastic member 6
Is stretched to form waist gathers , and
The two ends 2a, 2a in the longitudinal direction of the
Located on the inner side of the diaper .

The topsheet 2 is a liquid-permeable sheet that allows excrement to permeate into the absorber 4 and has a feeling similar to underwear, and is generally used as a disposable diaper. As the sheet, for example, to improve the absorbability of urine sheeted by a spunbond method or a heat bond method using a fiber made of polyethylene, polypropylene, polyester or the like or a composite fiber of these fibers and a hydroentanglement method A single layer or a plurality of layers of nonwoven fabric which has been subjected to a hydrophilization treatment at least on a portion provided on the upper surface of the absorber, and a nonwoven fabric having a thickness of 5 to 35 g / m ² is used in consideration of feeling, strength, and urine absorbability. The topsheet 2 is arranged with a shorter dimension than the leakproof sheet 3 in the longitudinal direction of the disposable diaper. If the length is equal to or longer than the leak-proof sheet 3, bleeding leaks over the leak-proof sheet.

Therefore, the distance T from each longitudinal end of the topsheet 2 to each longitudinal end of the leak-proof sheet 3 is 5
~295mm, good Mashiku is a 30~150mm. Further, the topsheet 2 is provided with its longitudinal end portions 2a, 2a.
However, as shown in FIGS. 1 and 2, it does not come into contact with the elastic member 6. The leak-proof sheet 3 may be a liquid-impermeable film that is usually used, but a liquid-impermeable and moisture-permeable film may be used in order to further secure the wearer's comfort. preferable. In particular,
A liquid-impermeable and moisture-permeable film sheet or a fiber aggregate or a composite sheet of the film sheet and the fiber aggregate obtained by adding a filler to a thermoplastic resin is used.When the composite sheet is used, a normal sheet is used. Like the disposable diaper, the fiber assembly is used so as to be located on the outside.

[0013] leak-barrier sheet 3 in its longitudinal ends, but extends a distance S from each longitudinal edge of the absorbent core 4, the distance S is 1 0-200 mM, is good Mashiku 30
１００100 mm. It is preferable that the absorber 4 is formed in an hourglass shape in which a substantially center is constricted. As a material of the absorber 4, it is preferable to use a fibrillated pulp as a main material and a polymer water-absorbing polymer in combination. Preferably, a mixture of a thermoplastic resin, a cellulose fiber, or a polymer water-absorbing polymer is heat-treated. The location of the high-molecular-weight water-absorbing polymer may be any of the upper layer, the middle layer, and the lower layer, and may be a mixture with pulp. The high-molecular water-absorbing polymer has a performance of absorbing and retaining a liquid at least 20 times its own weight, and is preferably in the form of particles having a gelling property. (Salt) saponified graft copolymer,
A crosslinked product of sodium carboxymethyl cellulose, an acrylic acid (salt) polymer and the like are preferable.

The hydrophobic sheet 5 may be a general nonwoven fabric having hydrophobicity, but preferably has hydrophobicity as shown in FIG. 3 in order to completely prevent exudation of urine. The nonwoven fabric 5a and a liquid-permeable and moisture-permeable sheet 5b are laminated (composite).
It is arranged so that the nonwoven fabric side is in direct contact with the skin. Hydrophobic nonwoven fabric used for the hydrophobic sheet by these composites,
Like the topsheet, polyethylene, polypropylene,
It is made into a sheet by a spun bond method, a heat bond method, or a hydroentanglement method using a fiber made of polyester or the like or a composite fiber thereof, but is not subjected to a hydrophilic treatment. In addition, the liquid-impermeable and moisture-permeable film is already used as a backsheet of a disposable diaper, and is generally stretched by mixing a fine inorganic material into a general-purpose resin such as polyethylene. It can be obtained by:

The composite of the nonwoven fabric 5a and the sheet 5b may be a composite using an adhesive, a heat embossing system for applying heat, or an ultrasonic system. Adhesion is preferred. The hydrophobic sheet 5 has a dimension U extending inward from both ends (both ends in the diaper longitudinal direction) of the leak-proof sheet 3 in order to sufficiently exhibit its function is set to 10 mm or more . The dimension U is preferably S + 10 mm or more, particularly preferably S + 30 mm to S
Although it is +100 mm, if it covers more than 1/3 of the length of the absorber, the absorption area of the absorber 4 is reduced, which is not preferable. Further, in order to reliably prevent liquid leakage from the topsheet 2, the dimension W of the overlapping portion between the topsheet 2 and the hydrophobic sheet 5 is preferably 5 mm or more. The waist elastic member 6 may be any of a resin sheet such as natural rubber, synthetic rubber, and urethane having elasticity, a thread, and a foam, and may have any shape, but is preferably hydrophobic.

Reference numeral 7 in the drawing denotes a leg elastic member, which is formed of a member similar to the above-mentioned waist elastic members 6, 6 and forms a gather around the leg when worn, and Leakage is prevented. Next, the operation of the disposable diaper 1 of the first embodiment will be described. The disposable diaper 1 of this embodiment is absorbed by the absorber 4 via the topsheet 2 when the wearer urinates. The urine absorbed by the absorber 4 spreads around from the urination point, reaches the end 4a of the absorber 4 located on the waist flap 11, and tends to leak from the end 4a.
On the other hand, the liquid discharged to the urination point via the topsheet 2 not only allows the urine to pass through the absorber 4 but also spreads the topsheet 2 itself and reaches the end 2 a of the waist flap 11.

However, the end 2a of the topsheet 2 and the end 4a of the absorber 4 are covered with the hydrophobic sheet 5, and leakage of liquid (urine) reaching the ends 2a, 4a is prevented. Is prevented. In particular, since the topsheet 2 does not reach the end of the leakproof sheet 3, the leakproof sheet 3 and the hydrophobic sheet 5
And the topsheet 2 and the absorber 4
, And leakage from the flap 11 where the end portions of the topsheet 2 and the leakage prevention sheet 3 are located is prevented.

A gather is formed on the waist flap 11 by the elastic member 6 to improve the fit with the wearer, so that leakage from this portion is further enhanced. Especially for sudden urination
The gather of the waist flap 11 reliably prevents leakage .

[0019]

[0020]

According to the disposable diaper of the present invention, the leakage of the liquid from the waist can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view showing a disposable diaper according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a main part of the disposable diaper shown in FIG. 1 taken along the line II-II.

FIG. 3 is a sectional view of a hydrophobic sheet used in the disposable diaper shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Top sheet 3 Leak-proof sheet 5 Hydrophobic sheet 6 Waist elastic members 10a and 10b

Claims (2)

(57) [Claims] 1. A disposable diaper having a liquid-permeable top sheet, a leak-proof sheet, and an absorber located between the two sheets, wherein the leak-proof sheet has both ends in the longitudinal direction of the absorber. It is extended so that it may be located outside both ends in the longitudinal direction, and covers them from both ends in the longitudinal direction of the leakproof sheet to both ends of the absorber and both ends of the topsheet. A hydrophobic sheet is provided, and an elastic member is stretched on a waist flap formed by both ends of the leak-proof sheet and the hydrophobic sheet to form waist gathers. The absorber is also located on the inward side of the diaper, and the end of the topsheet in the longitudinal direction is not covered with the leakproof sheet.
The distance to the end in the longitudinal direction is 5 to 295 mm,
The leak-proof sheet is provided at the longitudinal end thereof with the absorber
Extends from the longitudinal end of the
The hydrophobic sheet extends from the longitudinal end of the leak-proof sheet.
Disposable diapers, characterized that you have extended more than 10mm on the side. 2. The disposable diaper according to claim 1, wherein the hydrophobic sheet comprises a composite sheet of a liquid-impermeable and moisture-permeable sheet and a hydrophobic nonwoven fabric.