JPS61244347A - Disposable diaper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an easy-to-use diaper that does not require a separate diaper cover. Although it can be used for both infants and adults, it is especially suitable for the latter.

(Prior art) Disposable diapers that do not require a separate diaper cover are
Regardless of whether it is used for infants or adults, as shown in FIGS. 8 to 11, it consists of a water-permeable top sheet 1 such as a nonwoven fabric, a water-impermeable back sheet 2 such as a plastic film, and the front and back sheets. An elastic band (ribbon) made of rubber or the like that stretches in the longitudinal direction is placed between the front and back sheets 1 and 2 on opposite sides in the width direction of the diaper. The absorbent body 3 of the diaper shown in FIG. 8 is formed in a rectangular shape, and the absorbent body 3 of the diaper shown in FIGS. 9 to 11 is formed in a concave shape so that the inseam region is narrow. . Further, any of the elastic pads 4 of the diaper shown in each figure are arranged on the outside of the absorbent body 3 at least in the crotch region.

(Problems to be Solved by the Invention) In the diaper shown in FIG. 8, since the absorbent body 3 in the crotch area is not formed narrowly, the absorbent body is strongly compressed in the wearer's crotch area and bent into an irregular shape. Complicated stress is generated due to the rigidity of the elastic band 4, and as a result, the adhesion force of the elastic band 4 to the body becomes uneven.

In general, the contact surface does not act at right angles to the skin, and generally the rigidity of the absorber 3 is such that the elastic band 4 is moved away from the area where it should be in close contact with the skin, or the original contractile force of the elastic band 4 is reduced. This results in unstable contact with the thigh in the crotch area. As a result, a gap is created between the diaper and the thigh, allowing bodily fluids to leak.

In the diapers shown in FIGS. 9 to 11, the absorbent body in the crotch region is formed narrowly, so that when a relatively large amount of body fluid is excreted, this region absorbs the body fluid with the required absorption capacity and speed. Therefore, it is preferable that the width of this region is wide, but if the width of this region is larger than a certain width, substantially the same drawbacks as in the case of the diaper shown in FIG. 8 will occur. arise. Furthermore, in the diaper shown in FIG. 9, a part of the elastic band 4 intersects with the lower surface of the absorbent body 3, so that the elastic band 4 presses the absorbent body 3 on the wearer, and bodily fluids in the absorbent body 3 spread in that area. In addition, the outer region of the elastic band 4 is open to free space.

Body fluid oozes from the intersection area.

In particular, diapers for adults need to have a sufficiently large absorption capacity in the crotch area, as the amount and speed of bodily fluid excretion per adult is incomparably greater than that of infants. Since there are large individual differences, it is necessary to be highly adaptable to these differences. However, adult diapers that have been put into practical use to date have not effectively solved the above-mentioned drawbacks, so even if they exhibit excellent absorption performance when used in the supine position, they do not work well when used in the supine position. When used, the absorption performance is extremely low and unstable, and the adaptability to individual differences in body size and shape is also low.

An object of the present invention is to provide a disposable diaper that has improved adaptability and sealing properties in the crotch region of the wearer, and is adaptable to individual differences in body size and body shape, thereby improving leakage resistance of body fluids. be.

(Means for Solving the Problems) The present invention has a constitution for achieving the above-mentioned object, which includes a water-permeable top sheet, a water-impermeable back sheet,
In a disposable diaper, the disposable diaper includes an absorbent body enclosed between the front and back sheets, and a stretchable elastic part that is disposed at a position facing each other in the width direction of a diaper body made of these and compresses the thighs of the wearer. A water-impermeable sheet member is provided on the upper surface of the top sheet in the facing position and extends integrally from the opposite side of the back sheet in the width direction, and the sheet member is arranged inside the back sheet in the width direction in the longitudinal direction thereof. The diaper is characterized in that it is imparted with stretch elasticity.

The present invention will be further explained based on the illustrated embodiment as follows.6 As shown in FIG. A second tape fastener 6°7 is extended, and a second tape fastener 6°7 is provided. It is assembled by securing the free end of the second tape fastener 6.7 to the front area. 1st. The second tape fastener 6.7 is made of a known pressure-sensitive adhesive tape, the first tape fastener 6 is inclined upward at a predetermined angle, and the second tape fastener 7 is inwardly inclined at a predetermined distance from the first tape fastener 6. The tape fasteners 6 are spaced apart and substantially perpendicular to the longitudinal axis of the diaper, and are slightly longer than the first tape fastener 6. The reason why the first and second tape fasteners 6.7 are provided is to facilitate fixation of these free ends to the front region and to ensure a stable and secure fixation.

As shown in FIGS. 2 and 3, the diaper has a main body consisting of a water-permeable top sheet 8, a water-impermeable back sheet 9, and an absorbent core 10 enclosed between the front and back sheets. The absorbent core 10 of the diaper shown in FIG. 2 is formed in a rectangular shape, and the absorbent core 10 of the diaper shown in FIG. 3 has a concave portion 11 formed so that the crotch region is narrowed.

Top sheet 8. Back sheet 9. The absorbent body 10 is made of materials used in conventional disposable diapers, for example,
The top sheet 8 is a nonwoven fabric, a porous plastic film, etc., the back sheet 9 is a plastic film, a waterproof nonwoven fabric, etc., and the absorbent body 10 is mainly made of cotton-like pulp, preferably containing highly absorbent polymer particles. A mixture of each is used. Also as conventionally known.

If necessary, the absorbent body 10 is covered with tissue paper or a hydrophobic net-like sheet. However, the present invention does not particularly care about the materials of these constituent members.

In the diaper shown in FIGS. 3 and 4, water-impermeable sheet members 12a and 12b, which are integrally joined to the face sheet 9, extend on the upper surface of the top sheet 8 on one side opposite to each other in the width direction.

The sheet member 12a shown in FIG. 3 is made of the same material as the back sheet 9, and a plurality of rubber elastic bands 13a are attached along between the inner edges in the width direction folded back on the lower surface by adhesive means such as hot melt adhesive. Attached to the bottom of the extension. The sheet member 12b shown in FIG. 4 is made of a thin highly flexible plastic film that becomes thermoplastic and exhibits elasticity when heat treated.The sheet member 12b shown in FIG. 13b is given.

Plastic films having such properties have been proposed as elastic bands for conventional disposable diapers, such as Japanese Patent Application Laid-open No. 144601/1983, US Patent No. 3,819,401, and US Patent No. 3,912,565. It is possible to use those disclosed in No.

In the diaper shown in FIGS. 5 and 6, one top sheet 8
The widthwise opposing outer edges of the sheet members 12c and 13d are joined together as a pair.

Sheet members 12a and 12b1 shown in FIGS. 3 to 6
The widthwise inner edges of 2c and 12d do not necessarily need to be folded back. These sheet members, especially their elastic parts, are in a free state with respect to the top sheet 8 at least during wearing of the diaper, that is, they are not fixed to the top sheet 8 so as to be able to contract freely. Although it covers the top sheet 8, as long as it is in such a free state with respect to the top sheet 8, even if it is temporarily joined to the top sheet 8 so that it easily separates from the top sheet 8 due to wetness due to body fluids or body movements during wear. good.

As shown representatively in FIG. 3, the distance between the opposing sheet members 12a, 12b, 12c, and 12d, that is, the upper surface width W of the absorbent body 10 not covered with these sheet members, is 35III+ or more, and The width between the inner edge of these sheet members and the outer edge in the width direction of the absorbent body 10, that is, the effective width W of these sheet members is preferably 10wn or more, and if it is less than that, the effect of the present invention described below will not be applied. The effect is not sufficient.

Note that the sheet members 12a, 12b, 12c, 12d
It is preferable that the elastic bands 13a, 13b and the elastic parts 13c, 13d are provided over the entire length of the diaper as shown in the illustrated example, but it is sufficient if they are provided at least in the crotch area. Preferably, it is provided in the crotch area.

Note that the longitudinal ends of the sheet members 12a, 12b, 12c, and 12d are integrally joined to the same ends of the top sheet 8 and/or the back sheet 9. Further, the top sheet 8 and the back sheet 9 are joined together at their outer peripheral edges using a hot melt adhesive, welding, or the like, as in conventional disposable diapers.

(Function) The diaper according to the embodiment of the present invention having the above-mentioned configuration is assembled and worn as shown in FIG. Bands 13a, 13b, elastic part 1
3c and 13d make it elastically close to the wearer's thigh. In this case, since these elastic bands or elastic parts are arranged in a free state relative to the absorbent body 10, which is a rigid sheet member, the contractile force is not reduced by the absorbent body 10 and acts freely. Improves adhesion.

The excreted body fluid is absorbed by the absorber 10 from the top sheet 8 between the facing sheet members and diffused into the surroundings, but
When diffused in the width direction, leakage from the region where the sheet member is located is prevented because the sheet member has water impermeability. In particular, in the posture of the wearer, the sheet member separates from the upper surface of the absorbent core 10 and forms an angle with the back sheet 9. Since the patient is often placed in either a supine or lateral position, the sheet member prevents even a relatively large amount of excreted body fluid from overflowing on the upper surface of the absorbent body 10 and flowing in the width direction. .

(Example) A diaper having a structure as shown in FIG. 4 was produced. The components of this diaper were as follows. That is,
The water-permeable surface sheet is made of 100% polyester fiber.
, a non-woven fabric with a basis weight of 30 g/rrr and dimensions of 800 x 340 m, and a water-impermeable straight sheet with a thickness of 30 μ and dimensions of 80 m.
0 x 340m+ plus the width dimension equivalent to the water-impermeable sheet member, as an absorber, the weight per area is 150g/durability, dimensions? Cotton-like bulbs measuring 10 x 340 x 5+e were used, and the water-impermeable sheet members were provided by folding back both sides of the water-impermeable back sheet in the width direction. Further, two natural rubber threads having a diameter of 0.635 mm and a length of 150 I and stretched to a length of 450 na were fixed to the inner edge in the width direction of the folded portion as the water-impermeable sheet member using a hot melt adhesive.

The distance between the opposing elastic bands located on the innermost sides of such diapers, the width of the portion corresponding to the water-impermeable sheet member, the amount of absorption in lying and supine positions, and the leakage test results are as shown in the table below. Ta.

For absorption tests in the lateral and supine positions, the test diaper was attached to a device that incorporates an artificial excretion mechanism into a human body model made based on the body shape of a bedridden elderly person.

Artificial urine was injected at a constant rate while the body was tilted at an angle corresponding to the lateral or supine position, and the amount absorbed until leakage occurred was measured. The amount of excretion per adult is 150-200c.
c. Therefore, it is evaluated whether or not there is leakage after one excretion amount. In the table above, the O mark indicates no leakage, and the X mark indicates leakage.

(Effect of the invention) According to the present invention, it has the above-described structure and operation.

Furthermore, leakage of excreted body fluid can be effectively prevented even when the wearer is in a lying position or supine position, and even when the amount of excreted body fluid is relatively large. Furthermore, even if there are individual differences in the physique and body shape of the wearer, the absorbent body can be given any size and shape to accommodate these differences and have the required absorbent capacity. Furthermore, the function of the elastic part is not diminished by the rigidity, size, shape, etc. of the absorbent body.
It exerts the crimp force as designed in the area designed and placed to fit the wearer's crotch area.

There is an inherent contradiction between ensuring that the diaper has the best fit and complete seal in the crotch area and widening the width of the absorbent material in the crotch area to provide sufficient absorbent capacity. can be realized without contradiction. Therefore, it is particularly useful as a diaper for adults who excrete a larger amount of body fluid than infants and for adults such as bedridden elderly and sick people.

[Brief Description of the Drawings] Fig. 1 is an assembled perspective view of a diaper according to an embodiment of the present invention, Fig. 2 is a partially cutaway exploded plan view, and Fig. 3 is a cross section taken along the line A-A in Fig. 2. Figures 4, 5, and 6 are cross-sectional views taken along line A-A in Figure 2, and Figure 7.
1 to 10 are partially cutaway exploded perspective views of a conventional diaper. 8...Top sheet, 9...Back sheet, 10...
・Absorber, 12a (b, c, d) +++ Sheet member, 13a (b, c, d) - Stretchable elastic part Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 9 Fig. 8 1θ diagram

Claims (7)

[Claims] (1) A water-permeable top sheet, a water-impermeable back sheet, and an absorbent body enclosed between the front and back sheets, which are arranged at positions facing each other in the width direction of the diaper body made of these sheets, and press the wearer's thighs. In the disposable diaper including a stretchable elastic portion, an impermeable sheet member is provided on the upper surface of the top sheet at a position opposite to the diaper main body in the width direction, and extends integrally therefrom from a side portion of the back sheet opposite to the width direction. have,
The diaper as described above, wherein the sheet member is provided with stretch elasticity in the longitudinal direction on the inner side in the width direction. (2) The disposable diaper according to claim 1, wherein the sheet member is provided by folding back widthwise opposite sides of the back sheet. (3) The disposable diaper according to claim 1, wherein the sheet member is provided by being formed separately from the back sheet and integrally joined thereto. (4) The disposable diaper according to claim 1, wherein the sheet member is made of a flexible plastic film that does not substantially inhibit the elasticity. (5) The disposable diaper according to claim 1, wherein the elasticity is imparted by an elastic band stretched over the sheet member. (6) The disposable diaper according to claim 1, wherein the elasticity is imparted to the material itself of a required portion of the sheet member without attaching any separate member to the sheet member. (7) A disposable disposable according to claim 1, wherein a distance between opposing inner edges of the sheet member in the width direction is at least 35 mm, and a width between the inner edges and an outer edge in the width direction of the absorbent body is at least 10 mm. Diapers.