JPH03231664A - Disposable diaper - Google Patents

Abstract

PURPOSE:To prevent an absorptive body from deformation caused by movement of a wearer and absorption of discharged substance and to attempt to keep absorptive characteristics by fixing an upper sheet on a surface sheet at both end parts in the longer direction and to bring the central part of the upper sheet into contact with the surface sheet when a weight with a specified weight is placed on the central part of the upper sheet as it is. CONSTITUTION:A diaper 11 has a liq.-impermeable rear sheet 13, a liq.-permeable surface sheet 12, an absorptive body 14 and a liq.-permeable upper sheet 15 and the upper sheet 15 is fixed on a surface sheet 12 at both end parts 25 and 26 in the longer direction of the diaper 11 and the intermediate part thereof is not fixed and forms a free part 27. The length of the free part 27 is pref. made shorter than the distance between inside ends of fixing means 28 and 29 when the diaper 11 is flatly extended and the free part 27 is thus separated from the absorptive body 14. Furthermore, while it is kept under a natural condition and when a weight 30 of 40g is placed on the central part of the upper sheet 15, the part is brought into contact with the surface sheet 12. In addition, the position of the fixing means 28 and 29 are pref. in a range of about 10-50mm from the front and rear ends in the longitudinal direction of the diaper 11 and the width is pref. close to the front width of the upper sheet 15.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a disposable diaper, particularly a disposable diaper that has a liquid-permeable top sheet that adapts to the movements of the wearer and has an excellent fecal leakage prevention effect. The invention relates to disposable diapers.

[Prior art and problems to be solved by the invention] Conventionally,
As a means to prevent excrement from leaking from the legs of disposable diapers,
It is generally well known that an elastic member is installed in a side flap portion extending to the side of an absorbent body of a disposable diaper, and the side flap is brought into close contact with the leg portion by the expansion and contraction action of the elastic member. There are also disposable diapers that have a pocket structure or a leak-proof wall in the side flaps, as described in Japanese Utility Model Application Publication No. 58-18520 and Japanese Patent Application Publication No. 59-53702.

On the other hand, as a means to easily treat and dispose of excrement retained on the top sheet of disposable diapers,
As in Publication No. 175, the top sheet has a laminated structure,
Disposable diapers are known in which the top layer is peeled off to enclose excrement and make it easier to dispose of.

However, disposable diapers equipped with leg leakage prevention measures as described above cannot follow the movement of the wearer's crotch, and the gap between the legs creates a gap between the legs, which prevents large amounts of urine and feces from being excreted. The leakage prevention effect is poor.

In addition, since the absorbent body placed between the top sheet and the back sheet is adhesively fixed to both sheets, it is easily deformed due to movement of the wearer and absorption of excrement, resulting in a significant loss of absorption performance and deformed areas. leakage is likely to occur.

[Means to solve the problem]

The present inventors have conducted intensive studies to improve the shortcomings of conventional disposable diapers and to find a disposable diaper that is particularly excellent in leak-proofing properties against feces, and as a result, the present invention has been achieved.

That is, the present invention provides a disposable diaper having a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorbent body located between the two sheets, and a liquid-permeable top sheet located on the top surface of the top sheet. , a disposable diaper characterized in that both end portions in the longitudinal direction of the top sheet are fixed, and when a 40 g weight is placed on the center of the top sheet in a natural position, the portion on which the weight is placed comes into contact with the top sheet. It provides:

In the disposable diaper of the present invention, when a 40 g weight is placed on the center of the top sheet installed on the top surface of the liquid-permeable top sheet, the portion on which the weight is placed comes into contact with the top sheet, causing certain By creating a pocket structure, the liquid portion of stool is quickly guided to the absorbent body through the top sheet, and the stool is held in the pocket portion, thereby preventing stool leakage. In particular, diarrheal stools and soft stools seen in young children are highly fluid and difficult to absorb with conventional disposable diapers, resulting in leakage and much dissatisfaction among caregivers. In the present invention, the liquid portion of excrement can be guided to the absorbent body by the pocket structure formed by the top sheet, so that the leakage prevention effect is exhibited even for highly fluid excrement.

In addition, in the present invention, the reason why the weight is specified as 40g is that the solid content of excrement remaining on the top sheet of a normal diaper for a wearer of a disposable diaper is the same for both infants and adults per diaper. Since both weights are about 40 g, 40 g is the standard for determining whether or not to form a pocket structure.

Furthermore, in the disposable diaper of the present invention, by fixing both ends in the longitudinal direction of the liquid-permeable top sheet installed on the top surface of the liquid-permeable top sheet, the side edges of the top sheet can be attached to the crotch area or the crotch area when worn. It adheres closely to the legs and follows the wearer's movements, increasing adhesion, and when the diaper is worn, a space is created between the top sheet and the top sheet to firmly hold excreted feces and provide protection against feces. It can significantly increase leakage. Furthermore, since the top sheet covers the wearer's crotch area, it is possible to prevent urine from leaking in large quantities or in any position.

Further, it is preferable to introduce an elastic member into the side edge portion of the top sheet, and by introducing the elastic member, it is possible to further improve the adhesion with the wearer's crotch region or leg region. The elastic member may be made of natural rubber, polyurethane, or the like, and may also be a thread that exhibits elasticity after getting wet with water.

The relationship between the longitudinal side edges of the top sheet and the longitudinal side edges of the top sheet is such that in the natural state of the diaper, the longitudinal side edges of the top sheet are the same as the longitudinal side edges of the top sheet. It is preferable to be located above.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a plan view of a disposable diaper 11 according to the present invention in a flat, stretched state, and in order to more clearly show the structure of this diaper 11, a part of the structure is cut away, and the surface that contacts the wearer is shown in FIG. FIG.

As shown in FIG. 1, the diaper 11 has a liquid-impermeable back sheet 13, a liquid-permeable top sheet 12, an absorbent body 14, and a liquid-permeable upper sheet H5, and a dorsal waist portion 21; Ventral waist part 23, crotch part 22, and side flaps 24
including. Furthermore, it may include a pair of tape fasteners 16 and an elastic body 17 inside the side flap 24,
This improves the functionality and performance of the diaper.

The diaper 11 has such a structure that an absorber 14 is installed between a liquid-impermeable back sheet 13 and a liquid-permeable top sheet 12, and a liquid-permeable top sheet 15 is installed on the top surface of the liquid-permeable top sheet 12. be done. In a more preferred embodiment, an elastic body 17 is provided between the back sheet 13 of the side flap 24 and the top sheet 12, and a pair of tape fasteners 16 are fixed to the back waist portion 21 of the side flap 24.

The diaper 11 is generally long in the vertical direction (the back sheet 13 and the top sheet 12 have approximate lengths and widths).

As the back seam 3, a low-density opaque polyethylene sheet with a thickness of 10 to 60 μm is generally used.
Particularly preferred is a vapor-permeable, liquid-impermeable porous sheet that has low crunching noise and is less likely to cause stuffiness or rash. Here, the term "scraping sound" refers to the sound that occurs when a sheet or the like is rubbed. Surface sea H2 generally has a basis weight of 15
A nonwoven fabric having a weight of 40 g/n+'' is used, but any liquid permeable film, net, etc. may be used, and it is particularly preferable to use a nonwoven fabric with a saltwater surrounding area and a hydrophilic center area.

As the elastic body 17, polyurethane, natural rubber, etc. in the shape of a string or ribbon, or a thread that becomes elastic after getting wet with water, is generally used, and one piece of this is attached to each of the left and right side flaps of the diaper. A total of 5 or more books will be installed. The attached length of the elastic body 17 is preferably about 30 to about 60% of the length of the diaper, and the degree of elongation is preferably about 1.3 to about 2.0 times the free length.

As the absorbent body 14, a cotton-like body made by crushing coniferous kraft pulp is covered with water-absorbing paper, and it is particularly preferable that it contains a superabsorbent polymer.The weight of the cotton-like body is generally Approximately 10g to 40g. The superabsorbent polymer used in the absorbent material may exist in the upper, middle, or lower layer of the absorbent material, or may be mixed with the pulp, and the superabsorbent polymer particles may be starch-based, cellulose-based, or synthetic polymer-based. For example, starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, crosslinked sodium carboxymethyl cellulose, acrylic acid (salt) polymers, etc. are suitable. Such superabsorbent polymer particles weigh 2
It has a liquid absorption and retention power of 0 times or more and has the property of gelling.

The liquid-permeable top sheet 15 is located on the top surface of the top sheet 12 and is fixed to the top sheet 12 at both ends 25 and 26 in the longitudinal direction of the diaper 11, and the middle portion is not fixed and forms a free portion 27. are doing. The width of the upper surface seam 5 is preferably about 30% to about 70% of the width of the diaper 11, and in particular, the width of the upper surface seam 5 is narrower than the minimum width of the crotch portion 22 of the absorbent body 14.
This is preferable because the absorption performance of the absorber 14 can be effectively utilized. The length of the top sheet 15 is the same as that of the diaper 11 (
However, it is preferable that the length be substantially shorter. Top sheet 15
The planar shape of 1 is such that the width of the free portion 27 is narrow and the ends 25 and 26 are narrow so that the top sheet 15 can closely fit the wearer's crotch.
An hourglass shape with a wide width is preferred, but the width of the end portion 25,26 and the width of the free portion 27 may be the same, and the width of the free portion 2
7 is wider than the width of the ends 25 and 26 (but it doesn't matter.

As a material for the top sheet 15, a liquid-permeable sheet such as a nonwoven fabric, a mesh-like sheet, a porous sheet, an elastic sheet, etc. is used.

Fig. 2 is a cross-sectional view taken along the line A-A in Fig. 1 when worn, and Fig. 3 is a cross-sectional view showing the state when a 40 g weight is placed on the center of the top sheet. . The liquid-permeable topsheet 15 is secured to the liquid-permeable topsheet 12 at the ends 25,26 of the diaper 11 by means of fastening means 28,29, the free portion 27 being unsecured. The length of the free portion 27 is preferably substantially less than the distance between the inner ends of the securing means 28 and 29 when the diaper 11 is stretched flat, so that the length shown in FIG. As such, the free portion 27 is released from the absorbent body 14. Furthermore, in the disposable diaper of the present invention,
As shown in Figure 3, 40g
When the weight 30 is placed, the part on which the weight is placed is in contact with the top sheet 12.

The fixing means 28 and 29 are located at two places in the longitudinal direction of the diaper 11, at the front and back (both must be in the position where the free part 27 exists, and from about 10 mm to about 50111I11 from the longitudinal ends of the diaper 11). A range of is preferred.

It is desirable that the width of the fixing means 28, 29 is approximately the same as the front width of the top sheet 15, and the area of the fixing means 28, 29 is not particularly limited. The peeling force between the top sheet H2 and the top sheet 15 in the fixing means 28 and 29 is such that at least the top sheet 15 is not peeled off during wear and is almost weakened during a peeling process for disposing of secretions, etc. It is preferable that the film be peeled off without any peeling. Specific methods for the fixing means 28 and 29 include hot melt adhesive, thermal adhesive, ultrasonic adhesive, suture, hook and loop combination, and the like.

In FIGS. 1 to 3, the liquid-permeable top sheet 15 is placed on the liquid-permeable surface seam 2, and the top sheet 12 is arranged on the entire surface of the diaper 11. It does not have to exist in the entire area under the seam 5. In this case, some of the fixing means 28 , 29 of the top sheet 15 may be associated with the back sheet 13 .

〔Example〕

Hereinafter, the present invention will be explained in more detail with reference to Examples.
The present invention is not limited to these examples.

Comparative Example 1 A nonwoven fabric (35 g/Iw") made of polyethylene/polypropylene fibers was used as a liquid-permeable top sheet, and a composite of fluff pulp and a superabsorbent polymer (crosslinked polyacrylic acid Na) (length: 390 g/Iw") was used as an absorbent material. wsX horizontal 15
0 mm), a polyethylene film (thickness: 40 μm) was used as the liquid-impermeable back sheet, and a polyurethane film was used as the elastic material for the rectangular part.
A diaper with a width of 30,011 mm and a width of 30,011 III was produced.

Comparative Example 2 Holes with a diameter of 5II and 11 were formed at a pitch of 1 in a hard vinyl chloride sheet.
Opened with 0■ (length 390 rare, width 180 r
aIl, thickness 30μ) was used as a top sheet and placed on top of the top sheet of the disposable diaper of Comparative Example 1 to make a disposable diaper.

Comparative Example 3 Heat-fused polyolefin fiber (25g/, z)
is used as the top sheet, and has the same dimensions in the longitudinal direction as the liquid-permeable top sheet of the disposable diaper of Comparative Example 1 (vertical 450 ++n
, width 180 mm) and placed on top of the top sheet to make a disposable diaper.

Example 1 In Comparative Example 3, the length of the top sheet was set shorter than the length of the liquid-permeable top sheet in the longitudinal direction.
A disposable diaper was obtained in the same manner except that the width was 180 ms+).

Example 2 A thread-like elastic body containing natural rubber as a main component was introduced into the side edges of the top sheet of Example 1, one on each side, to obtain a disposable diaper in which the top sheet had elasticity.

The diapers obtained in Examples 1 to 2 and Comparative Examples 1 to 3 were attached to a baby model designed and manufactured based on an infant weighing 10 kg, and the leakage prevention effect was evaluated.

The leakage prevention effect was evaluated by applying the test liquid at a rate of 3g/sec for 10 minutes.
Inject every g at once, and calculate the absorbed amount until it leaks from the back when lying on your back (back leak value), and the absorbed amount before leaking from your stomach when lying on your stomach (front leak value). Ta.

The results are shown in Table 1.

Table 1

[Brief explanation of drawings]

The drawings show how the absorbent article of the present invention is applied. Figure 1 is a partially cutaway plan view of the disposable diaper according to the present invention in a flat stretched state, and Figure 2 is a partial cutaway view of the disposable diaper of the present invention. A-
FIG. 3 is a cross-sectional view showing the A-line cross section in the worn state, and FIG. 3 is a cross-sectional view showing the state when a 40 g weight is placed on the center of the top sheet. 11... Diaper 13... Back sheet 15... Top sheet 17... Elastic body 22... Crotch portion 24... Side flaps 26... End portion 28... Fixing means 30...・40g weight 12...Top sheet 14...Absorber 16...Tape fastener 21...Dorsal waist part 23...Ventral waist part 25...End part 27...Free part 29...fixing means

Claims (3)

[Claims] 1. Liquid-permeable top sheet, liquid-impermeable back sheet,
In a disposable diaper having an absorbent body located between the two sheets and a liquid-permeable top sheet located on the upper surface of the top sheet, both end portions in the longitudinal direction of the top sheet are fixed, and the center of the top sheet is fixed in the natural position. A disposable diaper characterized in that when a 40 g weight is placed on the diaper, the portion on which the weight is placed comes into contact with the top sheet. 2. The disposable diaper according to claim 1, further comprising an elastic member on the side edge of the top sheet. 3. Claim 1 or 2, wherein the side edges of the top sheet are located above the side edges of the top sheet when the diaper is in its natural state.
Disposable diapers as described.