Surgery – Means and methods for collecting body fluids or waste material – Absorbent pad for external or internal application and...
Reexamination Certificate
1998-11-25
2001-05-08
Ruhl, Dennis (Department: 3761)
Surgery
Means and methods for collecting body fluids or waste material
Absorbent pad for external or internal application and...
C604S381000, C604S385080, C604S385101
Reexamination Certificate
active
06229063
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to training pants for infants.
The training pants of this type are well known, for example, from Japanese Utility Model Application Disclosure Gazette (Kokai) No. Hei7-33916, which includes a wetness sensitive sheet provided on an inner surface of the pants in the middle of its crotch region. The sheet has a high water retaining capacity and adapted to give a wearer discomfortable feeling of wetness upon absorption of urine. The wetness sensitive sheet elastically contracts longitudinally of the crotch region and thereby normally biased to be brought in contact with the wearer's crotch region. Therefore, the wetness sensitive sheet reliably functions to give the wearer a feeling of wetness even if urine is discharged on the pants with its crotch region being not in close contact with the wearer's crotch region.
In the above-mentioned training pants, the wetness sensitive sheet will not be brought in contact with the wearer's crotch region even when the wetness sensitive sheet contracts, so long as the pants have slipped down and the wetness sensitive sheet has been spaced from the wearer's crotch region beyond a limited distance.
SUMMARY OF THE INVENTION
In view of the above problem, it is an object of the invention to provide training pants so improved to achieve its desired training effect even when the pants have slipped down.
According to the invention, there are provide training pants having a front region, a rear region and a crotch region therebetween, the pants comprising a liquid-permeable topsheet, a liquid-impermeable backsheet and a liquid-absorbent core disposed therebetween, a waist-opening and a pair of leg-openings, the openings being respectively provided with elastic members adapted to be stretchable/contractile circumferentially of the respective openings, wherein: of the front and rear waist regions and the crotch region, at least the crotch region is partially composed so that the topsheet has a liquid-permeability which is lower in a transversely middle zone than in transversely opposite side zones of the crotch region.
According to another aspect of the invention, the transversely middle zone of the crotch region has a width in a range of 20~70 mm and the liquid-permeability of the topsheet depends on a total aperture area ratio of plural liquid-permeable apertures formed in the topsheet occupying a total area of the topsheet wherein the total aperture area ratio is in a range of 0~20% in the middle zone and in a range of 5~50% in the transversely opposite side zones, i.e., the total aperture area ratio is higher in the transversely opposite side zones than in the transversely middle zone by 5%.
According to still another aspect of the invention, the transversely middle zone of the crotch region has a width in a range of 20~70 mm and the transversely middle zone of the topsheet is made of a liquid-impermeable nonwoven fabric or a liquid-impermeable plastic sheet while the transversely opposite the zones of the topsheet are made of a liquid-permeable nonwoven fabric or a liquid-permeable apertured plastic sheet.
According to further another aspect of the invention, the total aperture area ratio gradually varies between the transversely middle zone and the transversely opposite side zones.
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Inoue Yasushi
Otsubo Toshifumi
Shimoe Nariaki
Baker & Daniels
Bogart Michael
Ruhl Dennis
Uni-Charm Corporation
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