JPS6314082B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in disposable diapers to be worn by infants, the elderly, sick people, etc. who are unable to dispose of their own excrement.

Conventionally, various types of disposable diapers that do not require a diaper cover have been proposed and put into practical use.
Generally, these known diapers include a water-permeable top sheet that comes into contact with the skin when worn, a back sheet that does not come into contact with the skin, and an absorbent body interposed between the two sheets.
The absorbent body often uses defibrated pulp as its main material, and a sheet of tissue paper is applied to each of the upper and lower surfaces of the absorbent body, and the top sheet and back sheet are bonded to the sheet using an adhesive. By joining each inner surface, it is temporarily fixed between the two sheets. Furthermore, some of these known diapers have a so-called hourglass shape with a narrower inseam area, and others have a simply rectangular shape.
The former has excellent adhesion to the wearer's legs. A typical example of the former is
The diaper described in Publication No. 40267 is known and is in practical use.

However, in conventional diapers, including the diaper described in the above-mentioned publication, the absorbent body is merely fixed between the top sheet and the back sheet via the tissue paper as described above, so it is difficult to handle and wear them. The absorbent body, which is mainly composed of defibrated pulp, loses its shape relatively easily due to the defibrated pulp having weak fiber binding properties, and forms a lump-like lump, which is unpleasant to the wearer. It gives the feeling of a foreign body and causes leakage of excretory fluid. In particular, in the absorbent body described in the above-mentioned publication in which the absorbent body has an hourglass shape, the absorbent capacity for excretory liquid is reduced in the narrowed part of the crotch area, and this causes leakage of excretory liquid.

The main object of the present invention is to provide a disposable diaper that can eliminate the above-mentioned drawbacks.

Hereinafter, the present invention will be explained with reference to illustrated embodiments. However, in the drawings, some parts are exaggerated for clarity.

1 and 2, preferred embodiments of the disposable diaper according to the present invention are representatively shown. The diaper 11 has a front side part 12 and a back side part 13.
The diaper 11 has a crotch region 14 and waist circumferences 15 and 16, and the diaper 11 is attached to the wearer's body by bonding tapes 17 attached to both ends of the waist region 16 to both ends of the waist region 15. It is designed to be worn. Furthermore, the diaper 11 includes a water permeable top sheet 18 that comes into contact with the skin when worn, an impermeable back sheet 19 that does not come into contact with the skin, an absorbent body 20 interposed between the two sheets, both side flaps 21, It is provided with an extensible member 22 for expanding and contracting both side flaps in the longitudinal direction.

Absorbent body 20 is shown in detail in FIGS. 3-10. That is, the absorber 20 is
It consists of a first absorbent member 23 and a second absorbent member 24. In the first absorbent member 23, as shown in FIGS. 4 and 6, the lower surface and both side edges of the defibrated pulp layer 25 are covered with a hydrophobic net-like sheet 26, and the upper surface is covered with a tissue sheet. paper 27
A slit 29 is cut diagonally so as to form a ladder-shaped portion 28 on both sides, and each portion 28 is folded inwardly and overlapped with the central portion 30 as shown in FIGS. 8 and 9. It is being Therefore, the first absorbent member 23 has an hourglass shape with a narrower folded portion 31 located in the crotch area 14 of the diaper, and
2. The widths of the portions 32 and 33 located on the dorsal side portion 13 are increased. The folded portion 31 is folded over each portion 2.
It is formed by stacking 8s one above the other,
Depending on the thickness of the defibrated pulp layer 25 and the width of the portion 31 to be formed, the portions 28 may be formed with their inner edges facing each other without overlapping each other, and the width of the portion 31, The length is determined by the size of the diaper to be formed. Second absorption member 2
4 is wider than the width of the portion 31, and the first absorbent member 2
It has the same length as the first absorbent member 23 and the upper surface and both side edges of the defibrated pulp layer 34 as shown in FIGS. 5 and 7. is covered with a hydrophobic net-like sheet 35, and the ninth
10, the portions extending outward from both side edges of the folded portion 31 on the upper surface of the first absorbent member 23 are indicated by diagonal lines in FIG. 9 and arrows in FIG. 10, respectively. The portion 36 shown is pressed in the thickness direction. Therefore, the portion of the absorbent body 2 located in the crotch area 14 of the diaper
0 is formed as the thickest layer, and each portion 36 located on both sides thereof is formed as the thinnest layer.

The hydrophobic net-like sheets 26 and 35 are made by, for example, adding a foaming agent to hydrophobic resins such as polypropylene, polyethylene, vinyl chloride, etc. alone or in a mixture, and melting and extruding them in an extrusion molding machine and simultaneously foaming them. It is obtained by molding and is known under the trade name "Noinet" and can be obtained from Mitsui Toatsu Co., Ltd. As shown in FIG. 11, these sheets 26 and 35 are thin, lightweight, and each fiber 37 is shaped like a continuous filament, and these are partially connected to form countless eyes 38. It has elasticity in the direction crossing the line of the strip 37, that is, in the width direction. These sheets 26 and 35, while covering the first absorbent member 23 and the second absorbent member 24, respectively, press down on the surfaces of these members when these members are subjected to bending or tensile stress during handling or wearing of the diaper. It acts to attach. Although one sheet is used for each of the first absorbent member 23 and the second absorbent member 24, a plurality of sheets may be used for each of these sheets 26 and 35. Further, as shown in the figure, it is preferable that it is also located inside the absorbent body 20, but the surface of the absorbent body 20 may simply be covered.

In this way, the first absorbent member 23 and the second absorbent member 24
As shown in FIG. It is sandwiched between the sheet 18 and the back sheet 19. The side flap 21 is
A first side flap 39 and a second side flap 40
The first side flap 39 is composed of the absorbent body 2
The second side flap 40 is formed by sandwiching the portion 36 between the top sheet 18 and the back sheet 19 that extend outward from both side edges of the folded portion 31 of 0, and the second side flap 40 extends outward from the side edges of the portion 36. It is formed by joining the top sheet 18 and back sheet 19 of the portion, and has a high degree of flexibility.

As shown in FIGS. 12 and 13, the top sheet 18 and the back sheet 19 are formed to have the same shape and size, and have cutout portions 18a and 19a on both sides. As the material for the top sheet 18, a nonwoven fabric or the like that is commonly used in disposable diapers is used. As a material for the back sheet 19, a thin flexible plastic film such as polyethylene, which is conventionally used in disposable diapers, is used. A cotton-like hot melt adhesive 41 is applied at appropriate intervals on the inner surface of the back sheet 19, and a relatively wide hot melt adhesive 42 is applied on both sides of the inner surface of the top sheet 18, and cotton is applied on the center region of the inner surface of the top sheet 18. A hot melt adhesive 43 is applied in the shape. Therefore, in the state of the completed diaper 11 as shown in FIGS. 1 and 3, the inner surfaces of the top sheet 18 and the back sheet 19 are bonded to the absorbent body 20 by the adhesives 41 and 43. part 3
The adhesive 42 and the adhesive 41, 43 are fixedly bonded to the hydrophobic net-like sheets 26 and 35 located on the upper and lower surfaces of the top sheet 18 and the back sheet 19, respectively. Joined at the ends. Therefore, the absorbent body 20 and the portion 36 are completely covered by the top sheet 18 and the back sheet 19 and are not moved in any direction between the two sheets.

In the present invention, it does not matter whether the side flap 21 is necessarily formed by twisting both the front and back sheets 18 and 19, or whether the elastic member 24 is located in the flap. Furthermore, it is necessary that the both sides formed by the cuts cut into both sides of the first absorbent member 23 are folded inwardly, but it is not necessary that the both sides overlap each other in the folded state. It doesn't matter whether you are familiar with it or not.

The present invention having the above configuration has the following effects.

(1) The important area for absorption of excreta in the absorber 20 is the first area.
The absorbent member 23 and the second absorbent member 24 are overlapped, and the crotch area 14 of the first absorbent member 23 is folded over, that is, the crotch area 14 of both absorbent members is multilayered. The areas of the absorbent body 20 excluding the corners are made thinner than the crotch area, and the corners (ears), which are not normally related to absorbing excrement fluid, are made of a single layer of the first absorbent member 23. , and the second absorbent members 24 located around the wearer's legs are also formed in a single layer.
In view of the fit of the diaper 11 to the body when worn and the function of absorbing excreta, the absorbent material is efficiently distributed to each area. In addition, each of the corner portions is where the diaper 11 is overlapped with each other when worn, and since only the single layer of the first absorbent member 23 is located and is the thinnest, the difference in level that occurs at the overlapping portion is small. There is no unsightliness or discomfort when worn due to the large step difference, and there is no inconvenience when the infant turns over in bed.

(2) The first absorbent member 23 and the second absorbent member 24 that constitute the absorber 20 are mainly made of defibrated pulp that easily loses its shape.
The upper surface is covered with hydrophobic net-like sheets 26 and 35, and in addition, the both sides 28 of the member 23 are folded over on the inner upper surface, so that the hydrophobic net-like sheet 26 is also located inside the absorbent body 20. This effectively prevents the absorbent body 20 from losing its shape when handling or wearing the diaper, and eliminates the leakage of excreta and discomfort caused to the wearer due to the deformation. This effectively prevents the excreted liquid from flowing back to the upper surface of the absorbent body and exuding from the upper surface of the diaper.

(3) The second absorbent member 24 extends outward from both sides of the first absorbent member 23 in the horizontal direction excluding both ends in the vertical direction.
The portion 36 is overlapped with the hydrophobic net-like sheet 35 in that portion.
It prevents the material from losing its shape and can perform the required absorption function.

[Brief explanation of the drawing]

The drawings show one embodiment of the diaper according to the present invention. Figure 1 is a developed plan view of the diaper viewed from the front side. FIG. 2 is a perspective view of the diaper being worn.
FIG. 3 is an enlarged sectional view taken along line 3-3 in FIG. Fourth
The figure is a developed plan view of the first absorbent member. FIG. 5 is a developed plan view of the second absorbent member. FIG. 6 is an enlarged sectional view taken along line 6-6 in FIG. FIG. 7 is an enlarged sectional view taken along line 7-7 in FIG. FIG. 8 is a plan view of the first absorbent member in a state where both side portions are folded up. FIG. 9 is a plan view of the second absorbent member stacked on top of the first absorbent member in FIG. 8. FIG. 10 is an enlarged sectional view taken along line 10-10 in FIG. 9. FIG. 11 is a partially enlarged plan view of a hydrophobic net-like sheet. FIG. 12 is a plan view of the inner surface of the back sheet. FIG. 13 is a plan view of the inner surface of the back sheet. 11... Diaper, 12... Front side part, 13... Back side part,
14... Crotch area, 18... Top sheet, 19... Back sheet, 20... Absorber, 23... First absorbent member, 2
4... Second absorbent member, 25... Defibrated pulp layer, 26...
Net-like sheet, 28... Ladder-shaped portion, 29... Slit, 31... Folded portion, 34... Defibrated pulp layer, 35... Net-like sheet.

Claims (1)

[Claims] 1. A disposable diaper comprising a water-permeable top sheet, a water-impermeable back sheet, and an absorbent body interposed between the two sheets and having a narrow crotch area and mainly made of defibrated pulp; , consisting of a first absorbent member and a second absorbent member; the first absorbent member is substantially vertically rectangular, at least its lower surface is covered with a hydrophobic net-like sheet, and both sides are spaced apart. the second absorbent member has a substantially vertically rectangular shape, and the first absorbent member has both side portions folded inwardly into each other; Wider than the width of the crotch area of the absorbent member and narrower than the width of the waist area of the first absorbent member, at least its upper surface is covered with a hydrophobic net-like sheet, and the upper surface of the first absorbent member is covered with a hydrophobic net-like sheet. overlapped, leaving the corner located in the lumbar region;
The diaper as described above.