Disposable body fluid absorbent wearing article

Details Disposable body fluid absorbent wearing article Disposable body fluid absorbent wearing article

2001-08-28

2004-08-03

Calvert, John J. (Department: 3761)

Surgery

Means and methods for collecting body fluids or waste material

Absorbent pad for external or internal application and...

C604S380000

Reexamination Certificate

active

06770795

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates to a disposable body fluid absorbent wearing article such as a disposable diaper, an urine absorbent pad or a sanitary napkin.
FIG. 9
of the accompanying drawings is a perspective view showing a liquid-pervious flexible composite sheet
100
described in Japanese Patent Application Publication No. 1999-217453A. This composite sheet
100
is adapted to be used as a liquid-pervious topsheet covering a liquid-absorbent core in a body fluid absorbent wearing article. The composite sheet
100
comprises a plastic sheet
101
and a fibrous layer
102
bonded to the lower surface of the sheet
101
. The sheet
101
has a plurality of flat zones
108
extending in parallel one to another in Y-direction and a plurality of opening arrays
111
extending in the Y-direction, each of the arrays comprising a plurality of openings
109
. Each of the flat zones
108
are formed along its edges
118
with rising portion
112
extending upward from the flat zone
108
. Upper edge
117
a
of the rising portion
112
undulates along the edges
118
. In the case of the disposable diaper using this composite sheet
100
as its liquid-pervious topsheet, a quantity of body fluids discharged on the flat zones
108
of the composite sheet
100
will flow through the troughs defined between respective pairs of the adjacent individual rising portions
112
,
112
into the openings
109
and then will be absorbed by the core underlying the composite sheet
100
. The plastic sheet
101
has its initial shape held by the fibrous layer
102
and therefore it is not apprehended that the sheet
101
might be wrinkled and consequently a plurality of the openings
109
might be substantially closed. The composite sheet
100
preferably has a breathability of 5~700 cm
3
/cm
2
·sec as measured in accordance with prescription of JIS L 1096 and a water-resistance of 0~200 mm as measured in accordance with prescription of JIS L 1092.
The flexible composite sheet of prior art is certainly advantageous in that a plurality of projections, i.e., individual rising portions serve to offer a cloth-like touch in spite of being made from plastic sheet material and a plurality of openings serve to improve the liquid- and air-permeability. In addition, this composite sheet is hydrophobic in its flat zones as well as in its rising portion so that a cloth-like touch free from wetness may be maintained even after body fluids have been discharged thereon. However, these flat zones and rising portion are rather repellent against body fluids and may deteriorate the desired liquid-permeability of the composite sheet.
SUMMARY OF THE INVENTION
It is an object of this invention to provide a disposable body fluid absorbent wearing article that maintains a dried cloth-like touch and the high liquid-permeability.
According to this invention, there is provided a disposable body fluid absorbent wearing article comprising a liquid-pervious topsheet, a liquid-impervious backsheet and a liquid-absorbent core disposed between these top- and backsheets.
According to this invention the topsheet comprises plastic film layer sections each having upper and lower surfaces and a thickness of 0.001~0.05 mm, liquid-pervious openings defined between respective pairs of the adjacent plastic film layer sections and a first fibrous layer bonded to the lower surfaces of the plastic film layer sections and immediately underlying the openings, the topsheet having a Klemm's water absorbency lower than 10 mm, each of the openings has a width of 0.05~1 mm so that a total open area thereof occupies 3~40% of a surface area of the topsheet, edges of the plastic film layer sections defining the openings being partially fibrillated so as to form a rising portion having the maximum height of 1.5 mm and component fibers of the first fibrous layer having a fineness of 0.5~20 dtex and a basis weight of 5~60 g/m
2
; and the core has a second fibrous layer being closely contiguous to the lower surface of the first fibrous layer and a third fibrous layer being closely contiguous to the lower surface of the second fibrous layer wherein the second fibrous layer has a Klemm's water absorbency is lower than 35 mm but higher than a Klemm's water absorbency of the topsheet by 15 mm or more and the third fibrous layer has a Klemm's water absorbency of at least 35 mm but higher than the Klemms water absorbency of the second fibrous layer by 15 mm or more.


REFERENCES:
patent: 5395359 (1995-03-01), Nakanishi et al.
patent: 5865822 (1999-02-01), Hamajima et al.
patent: 6068619 (2000-05-01), Hamajima et al.

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