Surgery – Means and methods for collecting body fluids or waste material – Absorbent pad for external or internal application and...
Reexamination Certificate
1999-09-30
2002-04-09
Weiss, John G. (Department: 3761)
Surgery
Means and methods for collecting body fluids or waste material
Absorbent pad for external or internal application and...
C604S385300
Reexamination Certificate
active
06368312
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a disposable pull-on diaper for absorption and containment of bodily wastes.
A disposable pull-on diaper is well known, which comprises a liquid-pervious topsheet, a liquid-impervious backsheet and a liquid-absorbent core disposed between these two sheets. These components are assembled together to form a waist-opening and a pair of leg-openings.
FIG. 4
in the accompanying drawings is a sectional view showing an example of such well-known diaper. As shown, front and rear waist regions
106
,
107
of a diaper
100
are put flat together and joined to each other along their respective side edges so as to form a waist-opening
111
and a pair of leg-openings
112
, thereby to present a pants-like or brief configuration. Both the waist-opening
111
and the leg-openings
112
are provided along their peripheral edges with elastic members
113
,
114
, respectively, extending circumferentially and secured under appropriate tension thereto.
FIG. 5
is a view similar to
FIG. 4
, showing the same well-known diaper as the elastic members
113
,
114
have contracted. Referring now to
FIGS. 4 and 5
, movements of the diaper components before and after the elastic; members
114
for the leg-opening have contracted will be described with respect to the uppermost point
121
of the leg-opening
112
. As will be apparent from this comparison, contraction of the members
114
causes a crotch region
108
of the diaper
100
to move upward together with a liquid-absorbent core
102
. However, topsheet
103
and the backsheet
104
are joined to teach other by means of hot melt adhesive
116
,
116
A, provided at front and rear ends of the topsheet
103
and the backsheet
104
and provided immediately above front and rear ends
119
,
120
of the liquid-absorbent core
102
. Such arrangement disadvantageously restricts the liquid-absorbent core
102
against freely moving upward and, in consequence, forcibly crook the liquid-absorbent core
102
as seen in FIG.
5
.
Once such crookedness occurring in the liquid-absorbent core has become permanent, a gap is left due to the permanent crookedness between the diaper put on the wearer's body and the wearer's skin. Such gap makes it difficult for the liquid-absorbent core to absorb body fluids discharged on the diaper as rapidly as possible. Furthermore, the crookedness of the liquid-absorbent core increases an apparent thickness of the diaper and makes the packaged diaper inconveniently bulky.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a disposable pull-on diaper having a liquid-absorbent core that is free from crookness or deformation.
According to the present invention, there is provided a disposable pull-on diaper having a front region, a rear region and a crotch region therebetween, the diaper comprising a liquid-absorbent core, a topsheet overlying the liquid-absorbent core and a backsheet underlying the liquid-absorbent core, the liquid-absorbent core extending across the crotch region into the front and rear waist regions, the front and rear waist region being joined to each other along side edges thereof to form a waist-opening and a pair of leg-openings; the waist-region and the leg-openings being provided with elastic members secured under tension thereto and extending circumferentially along peripheral edges of the respective openings; and the topsheet and the backsheet being joined to each other along the peripheral edges of the respective openings.
In such disposable pull-on diaper, the liquid-absorbent core has front and rear ends adjacent outer ends of the front and rear waist regions, respectively, defining together the peripheral edge of the waist-opening so that the liquid-absorbent core is restrained against a movement thereof relative to the topsheet in the front and rear waist regions as well as in the crotch region but freely movable relative to the backsheet at least in the front and rear waist regions; and the topsheet and the backsheet are not joined to each other at portions thereof extending outward beyond the front and rear ends of the liquid-absorbent core to the peripheral edge of the waist-opening.
According to one embodiment of the present invention, a portion of the topsheet extending outward beyond any one of the front and rear ends of the liquid-absorbent core to the peripheral edge of the waist-opening is tucked between the liquid-absorbent core and the backsheet.
REFERENCES:
patent: 4578066 (1986-03-01), O'Conner
patent: 4610681 (1986-09-01), Strohbeen et al.
patent: 5137526 (1992-08-01), Coates
patent: 5185011 (1993-02-01), Strasser
patent: 5324278 (1994-06-01), Visscher et al.
patent: 5575782 (1996-11-01), Hasse et al.
patent: 5593400 (1997-01-01), O'Leary
patent: 5626571 (1997-05-01), Young et al.
patent: 5846232 (1998-12-01), Serbiak et al.
patent: 0 226 789 (1987-07-01), None
patent: 0 763 353 (1997-03-01), None
patent: 0 933 073 (1999-08-01), None
patent: 2 242 821 (1991-10-01), None
patent: WO 99/07319 (1999-02-01), None
Copy of European Search Report completed Feb. 13, 2001.
Uni-Charm Corporation
Webb Jamisue
Weiss John G.
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