JP3330025B2 - Disposable diapers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable diaper capable of preventing a body fluid from leaking sideways.

[0002]

2. Description of the Related Art Conventionally, the use of a hydrophobic sheet for a liquid-permeable inner sheet of a disposable diaper is known as a conventional technique. Further, in the training pants disclosed in Japanese Utility Model Laid-Open Publication No. 7-33916, a moisturizing sheet having a higher water retaining capacity than the sheet is joined to the central portion of the upper surface of this kind of inner sheet.

[0003]

The known pants are:
Since the excreted urine can be held in the center of the inner surface of the diaper, it is effective as a means for preventing lateral leakage of urine as long as the amount of the urine does not exceed the limit. However, since the known pants are for training, urine is held on the sheet in a state that gives the skin a wet feeling. Therefore, although these pants have a function of preventing lateral leakage, they naturally have a poor wearing feeling after urination, and are not suitable for use as so-called diapers.

[0004] Therefore, an object of the present invention is to provide a disposable diaper having an excellent lateral leakage prevention function and a feeling of wearing.

[0005]

In order to solve the above-mentioned problems, the present invention is based on the premise that a liquid-permeable inner sheet,
Liquid impermeable outer sheet and liquid absorption interposed between the two sheets
Urine absorbing sheet bonded to the upper surface of the inner core and the conductive core
This is a disposable diaper composed of:

[0006] On this assumption, the present invention is characterized in that the inner sheet includes at least the urine absorbing material.
In the area where the sheet is located and abuts the upper surface of the core,
A plurality of apertures having an aperture area of 0.2-4 cm ²
The urine is formed at an area ratio of 20 to 70%.
The sheet has a hydrophilic property coated with a surfactant.
You.

[0007] In one embodiment of the present invention, prior to
The urine absorbing sheet is joined to the liquid absorbing core at an opening of the inner sheet.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the disposable diaper according to the present invention will be described below with reference to the accompanying drawings.

The diaper 1 shown in a partially cutaway view in FIG.
Hydrophobic and liquid-pervious inner sheet 2 having a large number of open pores 5
, A liquid-impermeable outer sheet 3, and both sheets 2, 3
And a liquid absorbing core 4 interposed therebetween. The diaper 1 in its longitudinal direction, the front waist region and (front body) 6, a rear waist region and (rear body) 7, a crotch region 8 positioned between these two waist regions 6, 7 I have. The inner and outer sheets 2, 3 extend laterally from the four circumferences of the core 4 and overlap, and are joined to each other. A waist elastic member 9 and a leg elastic member 11 are disposed in the rear waist region 7 and the crotch region 8, and at least one of the inner and outer sheets 2 and 3 when the elastic members 9 and 11 are extended. It is joined to the inner surface of
In the crotch region 8, at the center of the upper surface of the inner sheet 2,
The hydrophilic urine absorbing sheet 12 is joined. Rear waist area 7
A tape fastener 13 is attached to each side edge of the tape.

FIG. 2 is a partial sectional view taken along line II-II of FIG. The inner sheet 2 comes into contact with the upper surface of the core 4 and
At least a portion of the inner surface sheet portion in the portion contacting, more preferably an open hole 5 to substantially the entire inner surface sheet portion in the site. The contact portion of the inner sheet 2
Each of the openings 5 has an area of 0.2 to 4
cm ² , and the total area ratio to the inner sheet portion is
20-70%. In the site of the residual, its following open area these are opening area ratio. In addition, the open hole 5, the inner
The remaining portion of the face sheet 2 may not be formed. The inner sheet 2 includes a nonwoven fabric having a basis weight of 10 to 70 g / m ² made of a hydrophobic thermoplastic synthetic fiber,
Thickness of 0.01 to 0.1 made of a hydrophobic thermoplastic synthetic resin.
A 1 mm aperture film is used. Examples of non-woven fabric, thermal bond nonwoven fabric, spunbonded nonwoven fabric, spunlace nonwoven fabric, include meltblown nonwoven fabric, openings 5, for example, the basis weight thereof nonwoven fabric is relatively small,
The constituent fibers may be formed by being largely separated from each other, or may be formed by shaping a nonwoven fabric. The inner sheet 2 may be stretchable or non-stretchable in the width direction and / or the front-rear direction of the diaper 1. If it is elastic sheet, a plurality of slits extending in a direction perpendicular to the stretch direction is formed in advance, the slit extending the sheet may be in the open hole 5 and expanded. The inner sheet 2 may be intermittently joined to the upper surface of the core 4 via the hot melt adhesive 16 as shown in the drawing, or may not be joined at all.

[0011] urine absorbent sheet 12, hydrophobic thermoplastic synthetic fiber consisting of a basis weight 15~150g / ^{m 2} nonwoven fabric, for example, thermal bond nonwoven fabric, spunbond nonwoven, and the like spun lace nonwoven fabric, a surfactant 0.1-0.
6 each other by applying a ratio of weight%, have a hydrophilic
You. Urine absorbing sheet 12, in addition to being joined to the upper surface of the inner sheet 2 by hot melt adhesive 17, and joined to the upper surface of the core 4 by hot melt adhesive 16 or 17 in the open hole 5 I have. By this joining, the urine absorbing sheet 12 is in close contact with the core 4.

In the diaper 1 thus configured, excreted urine is intensively absorbed by the hydrophilic urine absorbing sheet 12. Since the periphery of the urine absorbing sheet 12 is hydrophobic, urine does not exude from the sheet 12 and diffuse to the periphery, and the diaper 1 has little lateral leakage . The surfactant of the sheet 12 dissolves in the absorbed urine and moves to the core 4 via the opening 5 together with the urine. In the urine absorbing sheet 12, as the dissolution of the surfactant proceeds, the hydrophobic fibers are exposed, and the sheet 12 changes from a hydrophilic one to a hydrophobic one. The sheet 12 thus changed does not have a wet feeling even when it is in contact with the wearer's skin.

In the diaper 1, the elasticity of the inner and outer sheets 2 and 3 can be improved by using a stretchable material. In this case, the non-stretchable urine absorbing sheet 12 suppresses the expansion and contraction of the inner sheet 2 at the portion where it is joined.
Has a constant shape and does not close unnecessarily.

In the present invention, the shape of the diaper 1 may be a pants type other than the illustrated example. To join the respective members of the diaper 1, the members may be bonded with a hot melt adhesive or the like, or may be welded with a heat-fusible material.

[0015]

In the disposable diaper according to the present invention, a urine absorbing sheet made of a hydrophobic fiber non-woven fabric coated with a surfactant is bonded to the upper surface of the hydrophobic inner sheet, and the urine absorbing sheet is formed.
Over bets is bonded to the upper surface of the liquid-absorbent core in the open hole of the inner sheet. The excreted urine is intensively absorbed by the urine absorbing sheet and transferred to the core. Since the urine absorbing sheet is surrounded by the hydrophobic inner sheet, the urine does not exude from the urine absorbing sheet and diffuse to the surroundings, thereby preventing lateral leakage of the diaper. Surfactants urine absorbent sheet is shifted to the core by dissolving absorbed urine, urine absorbent sheet is gradually changed to hydrophobic ones from that of the parent aqueous.

Therefore, this diaper has less side leakage after excretion of urine, and has a slight wet feeling and is excellent in wearing feeling.

[Brief description of the drawings]

FIG. 1 is a partially broken plan view of a disposable diaper.

FIG. 2 is a partial sectional view taken along line II-II of FIG.

[Explanation of symbols]

1 disposable diaper 2 inner sheet 3 outer sheet 4 core 5 aperture 12 urine absorbent sheet

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A61F 13/15-13/84 A61F 5/44

Claims (4)

(57) [Claims] (1)Liquid permeable inner sheet and liquid impermeable outer sheet
And an absorbent core interposed between the sheets, and
And a urine absorption sheet joined to the top surface of the face sheet
In disposable diapers, At least the urine absorbing sheet is located on the inner sheet.
And the area of the hole in contact with the upper surface of the core is
0.2-4cm ² Have an area ratio of 20
Of the urine absorbing sheet,
Before being characterized by having a hydrophilic property coated with a surfactant
Note disposable diapers. 2. The diaper according to claim 1, wherein said urine absorbing sheet is joined to said liquid absorbing core at an opening of said inner sheet. 3. The diaper according to claim 1, wherein said urine absorbing sheet is joined to said inner sheet and said liquid absorbing core via a hot melt adhesive. Wherein a said inner sheet is elastic, the absorption
3. The diaper according to claim 1, wherein the urine sheet is non-stretchable.