Wet resilient absorbent article

Details Wet resilient absorbent article Wet resilient absorbent article

1999-03-19

2001-06-12

Ruhl, Dennis (Department: 3761)

Surgery

Means and methods for collecting body fluids or waste material

Absorbent pad for external or internal application and...

C604S378000, C604S385010

Reexamination Certificate

active

06245962

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to a disposable absorbent article and particularly to a sanitary napkin having an improved absorbent core that effectively and efficiently acquires and distributes fluids absorbed therein. More specifically, the invention relates to a sanitary napkin having a multi-layered absorbent core with at least one of the layers having a resilient cellulosic material exhibiting excellent wet crush recovery.
BACKGROUND OF THE INVENTION
The present invention relates to disposable absorbent articles, such as diapers, sanitary napkins, training pants, incontinent garments, overnight pads, panty liners, underarm shields, as well as other absorbent devices used for medical purposes, such as, surgical absorbents which utilize, to some degree, fluffed wood pulp fibers. Such articles are designed to absorb body fluids, such as urine, menses, blood, perspiration and other excrement discharged by the body. In order for such absorbent articles to function efficiently, the absorbent core must quickly absorb into the structure body fluids insulting its surface, retain the body fluid within the absorbent core and prevent body fluids from being discharged onto the person and/or the wearer's adjacent clothing.
The basic form of the absorbent article is well known and typically includes a bodyside, liquid-permeable cover, a garment-side, liquid-impermeable baffle and an absorbent core positioned between the cover and the baffle. Numerous variations of the elements in addition to the basic cover, baffle and absorbent core arrangement are known. Each additional element is usually directed to improving a specific characteristic of the absorbent article. Generally, on the larger absorbent articles, i.e. those designed to absorb and retain at least 20 grams of fluid, such as diapers, training pants, incontinent garments, overnight pads and maxi sanitary napkins, the absorbent core incorporates an absorbent batt that is used to absorb and retain the body fluids. This batt, sometimes referred to as “wadding”, is composed of one or more layers of fluffed wood pulp and typically has a substantial thickness, that is, greater than about 5 millimeters. Advantageously, the fluffed wood pulp layer is quite soft, flexible, and comfortable. However fluffed wood pulp has a disadvantage of poor in-plane wicking ability. Since the fluid to be absorbed is usually deposited in a localized area within the absorbent batt the fluff wood pulp does not efficiently transport body fluids for effective utilization of absorbent article absorbent capacity.
Another disadvantage of the fluffed wood pulp is that it has a low wet resiliency or a low wet stability. This allows the batt to collapse when wet, exacerbating low in plane fluid distribution, enhancing the probability that the absorbent article will sag, clump-up, bunch, twist or rope. To overcome these disadvantages it is known in the absorbent art to incorporate into a fluffed wood pulp batt a moisture stable material such as a polymeric material. Although these polymeric materials provide a wet stability to the batt they are generally hydrophobic. To obtain a satisfactory wet stability it usually requires a substantial amount of the polymeric material, relative to the amount of pulp, be incorporated into the batt which impedes the fluid distribution and capacity of the fluffed wood pulp batt.
Improving the performance of a disposable absorbent article which utilizes a fluffed wood pulp absorbent batt continues to be a formidable undertaking, although a number of improvements have been made in both the materials used and its construction. Improving fluid handling performance and wet resiliency protection without compromising comfort and fit has not yet met the desired needs of the consumer.
SUMMARY OF THE INVENTION
Briefly, this invention relates to an absorbent article having a liquid permeable cover, a liquid impermeable baffle and an absorbent core positioned between the cover and the baffle. The absorbent core has at least two layers of an absorbent material. The first absorbent layer comprises substantially a fluff wood pulp having an acquisition orifice therein. The acquisition orifice is configured to have a ratio of the length dimension to width dimension greater than unity. The second absorbent layer is one or more layers of a wet resilient, cellulosic material. This combination provides an absorbent article having greater absorbent utilization, is very comfortable and provides an absorbent core with an wet crush width recovery of greater than about 70 percent.
The general object of this invention is to provide an absorbent article having an absorbent core that is highly effective and efficient in rapidly acquiring and containing fluids. A more specific object of this invention is to provide a sanitary napkin having at least two absorbent layers with an acquisition orifice in the absorbent layer proximate the cover.
It is another object of the invention is to provide a sanitary napkin having a wet resilient, cellulosic absorbent material as that is especially effective in acquiring, distributing, and storing fluid insults.
Another object of the invention is to provide a sanitary napkin having an absorbent Core with a width recovery of greater than about 70 percent when the absorbent core is loaded with 25 milliliters of water and laterally compressed to 40% of its preloaded and precrushed dimension.


REFERENCES:
patent: 810122 (1906-01-01), Green
patent: 810123 (1906-01-01), Green
patent: 810125 (1906-01-01), Green
patent: 810127 (1906-01-01), Green
patent: 810130 (1906-01-01), Green
patent: 2024976 (1935-12-01), Mathey et al.
patent: 3364931 (1968-01-01), Hirsch
patent: 3592194 (1971-07-01), Duncan
patent: 3699966 (1972-10-01), Chapuis
patent: 3749627 (1973-07-01), Jones, Sr.
patent: 3828786 (1974-08-01), Cervantes
patent: 3897784 (1975-08-01), Fitzgerald
patent: 3954107 (1976-05-01), Chesky et al.
patent: 4029101 (1977-06-01), Chesky et al.
patent: 4195634 (1980-04-01), DiSalvo et al.
patent: 4333463 (1982-06-01), Holtman
patent: 4531945 (1985-07-01), Allison
patent: 4731065 (1988-03-01), Yamada
patent: 4834735 (1989-05-01), Alemany et al.
patent: 4988344 (1991-01-01), Reising et al.
patent: 4988345 (1991-01-01), Reising
patent: 5013309 (1991-05-01), Baigas, Jr. et al.
patent: 5047023 (1991-09-01), Berg
patent: 5048489 (1991-09-01), Fischer et al.
patent: 5048589 (1991-09-01), Cook et al.
patent: 5062840 (1991-11-01), Holt et al.
patent: 5134007 (1992-07-01), Reising et al.
patent: 5176672 (1993-01-01), Bruemmer et al.
patent: 5294478 (1994-03-01), Wanek et al.
patent: 5300053 (1994-04-01), Genaro
patent: 5300054 (1994-04-01), Feist et al.
patent: 5304161 (1994-04-01), Noel et al.
patent: 5318553 (1994-06-01), Weeks et al.
patent: 5330459 (1994-07-01), Lavon et al.
patent: 5399412 (1995-03-01), Sudall et al.
patent: 5401267 (1995-03-01), Couture-Dorschner et al.
patent: 5437653 (1995-08-01), Gilman et al.
patent: 5439458 (1995-08-01), Noel et al.
patent: 5451442 (1995-09-01), Pieniak et al.
patent: 5462541 (1995-10-01), Bruemmer et al.
patent: 5728084 (1998-03-01), Palumbo et al.
patent: 5810798 (1998-09-01), Finch et al.
patent: 5895379 (1999-04-01), Litchholt et al.
patent: 5941863 (1999-08-01), Guidotti et al.
patent: 5961507 (1999-10-01), Widlund
patent: 6011195 (2000-01-01), Muhs et al.
patent: 0 165 807 A1 (1985-12-01), None
patent: 0 335 253 B1 (1989-10-01), None
patent: 0 343 941 A3 (1989-11-01), None
patent: 0 422 504 A3 (1991-04-01), None
patent: 0 572 033 A3 (1993-12-01), None
patent: 2 133 987 (1984-08-01), None
patent: WO 85/02110 (1985-05-01), None
patent: WO 94/23761 (1994-10-01), None
patent: WO 95/00095 (1995-01-01), None

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