Disposable diaper

Details Disposable diaper Disposable diaper

1999-04-20

2001-05-29

Weiss, John G. (Department: 3761)

Surgery

Means and methods for collecting body fluids or waste material

Absorbent pad for external or internal application and...

C604S358000, C604S385290, C604S385101

Reexamination Certificate

active

06238380

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates to disposable diapers for absorbing and containing body exudates.
Japanese Patent Publication No. Sho52-40267 discloses a disposable diaper comprising a liquid-pervious topsheet, a liquid-impervious backsheet and a liquid-absorbent core disposed between these two sheets. The topsheet and the backsheet are bonded together along their portions extending outwards beyond a peripheral edge of the core. The known diaper is provided in proximity of its transversely opposite side edges with elastic members extending longitudinally of the diaper so that the lines along which these elastic members are stretched and contracted should be spaced from respective side edges of the core at least by 1.91 cm.
According to the disclosure of the Japanese Patent Publication No. Sho52-40267, the elastic members provided in association with leg-openings are spaced from the respective side edges of the core by 1.91 cm or more so that these elastic members may be free from a restriction by the core of a relatively high rigidity. According to such disclosure, it will be desired to further enlarge the distance by which the elastic members should be spaced from the respective side edges of the core as a rigidity of the core increases. However, a width of the crotch region of the diaper may be unacceptably enlarged as the distance is enlarged.
SUMMARY OF THE INVENTION
In view of the problem as has been described above, it is an object of the present invention to provide a disposable diaper allowing the elastic members associated with the leg-openings to be stretchable and contractile freely from any restriction by the rigidity of the core.
According to one embodiment of the invention, there is provided a disposable diaper comprising a liquid-pervious topsheet, a liquid-impervious backsheet and a liquid-absorbent core disposed between the topsheet and the backsheet which define a front waist region, a rear waist region and a crotch region extending between the front waist region and the rear waist region, and elastic members associated with leg-openings longitudinally extending along transversely opposite side edges of the diaper from the crotch region into the front and rear waist regions, wherein:
the core extends across the crotch region into the front and rear waist regions and has a top surface facing a body side of a wearer, a bottom surface opposed to the top surface, longitudinally opposite ends extending circumferentially of the diaper and transversely opposite side edges extending longitudinally of the diaper; the topsheet covering the top surface of the core is folded along the side edges of the core onto the bottom surface of the core so as to cover the bottom surface at least partially; the backsheet underlies the sections of the topsheet folded onto the bottom surface of the core and extends outwards beyond the side edges of the core; the sections of the topsheet folded onto the bottom surface of the core are bonded to the backsheet along zones extending, inside the side edges of the core, in parallel to a center line dividing a width of the diaper in two halves; and the elastic members associated with the leg-openings are secured to the backsheet in vicinity of the side edges of the core.
According to one embodiment of the present invention, the elastic members associated with the leg-openings respectively lie in the crotch region of the diaper within a range corresponding to a width defined by 10 mm as measured inwardly from the side edges of the core plus 30 mm as measured outwardly from the lateral surfaces.
According to another embodiment of the present invention, the backsheet is formed on its inner surface with a pair of barrier cuffs each having a relatively deformable distal edge extending longitudinally of the diaper inside each of the side edges of the core, a proximal edge fixed to the inner surface of the backsheet outside or inside the side edge of the core and extending in parallel to the distal edge, and an elastic member secured to the distal edge along an apex thereof under tension given longitudinally of the diaper so that the barrier cuff is normally biased by the tension to rise on the inner surface of the backsheet.


REFERENCES:
patent: 4822435 (1989-04-01), Igaue et al.
patent: 5458592 (1995-10-01), Abuto et al.
patent: 5520673 (1996-05-01), Yarborough et al.
patent: 0593082 (1994-04-01), None
patent: 0781539 (1997-07-01), None
patent: 52-40267 (1977-10-01), None

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