Surgery – Means and methods for collecting body fluids or waste material – Absorbent pad for external or internal application and...
Reexamination Certificate
2000-04-20
2003-07-22
Lo, Weilun (Department: 3761)
Surgery
Means and methods for collecting body fluids or waste material
Absorbent pad for external or internal application and...
C604S385020, C604S385030, C604S385040, C604S385050
Reexamination Certificate
active
06595977
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an absorbent article having a substantially tack free, high coefficient of friction backsheet for holding the article in place during use, and at least one self-release tape tab for positioning the article in a user's undergarments and maintaining its position in the absence of any exerted normal force on the article. Absorbent articles of the present invention include sanitary napkins, pantiliners, incontinence devices, diapers, and the like.
BACKGROUND OF THE INVENTION
Many absorbent articles, especially those designed and configured to absorb vaginal and/or urethral discharge, utilize pressure sensitive positioning adhesive on a backsheet layer to attach the article to a user's undergarment. To protect the positioning adhesive prior to use, a releasable sheet is typically applied over the adhesive. Disadvantages accompanying the use of a release sheet and positioning adhesive are numerous; some of which are illustrated below.
Release sheets are typically constructed from silicone coated paper, accounting for an expensive component in an absorbent article's composition. Moreover, consumers find it inconvenient and indiscreet to dispose of the sheet after removing it from the article.
One approach proposed for eliminating the need for a separate release sheet is to apply a release coating to a film overwrapper and adhere the article directly to the overwrapper. This approach eliminates some of the cost of a release sheet, but maintains the most expensive component, the coating itself. Another disadvantage of this approach is the requirement of an overwrapper. Many commercially available absorbent articles are sold in cartons or bags, and are thus not individually packaged with overwrappers.
U.S. Pat. No. 5,217,448 discloses an absorbent product having optional side panel usage. The products have side flaps with adhesive thereon and corresponding release areas on the undergarment-facing side of the product for the flaps to releasably adhere to. This configuration eliminates the need for a release sheet to protect the flap adhesive. The flaps can optionally be removed from the release area and attached to a user's undergarment. Additional zones of pressure sensitive adhesive occupy the undergarment-facing side of the article for maintaining the product's position during use, especially when the flaps are not employed. However, zones of positioning adhesive present other disadvantages. Portions of the positioning adhesive may remain in a user's undergarment after removing the absorbent article, creating the potential for the remaining adhesive to come into contact with the user's skin or permanently discolor her undergarment. Alternatively, the article may delaminate or tear upon removal if the adhesive has a bond strength to the undergarment greater than the integrity of the article itself. This presents difficult or unsanitary removal and disposal issues of the portions left in the undergarment.
Positioning adhesive can also exacerbate a common consumer complaint referred to as “bunching,” which renders absorbent articles uncomfortable and vulnerable to increased probability of peripheral leakage. The forces created between the article and the user's adjacent body parts create this phenomenon. During the dynamics of bunching, the positioning adhesive can adhere to itself creating a permanent crease or fold.
To eliminate positioning adhesives and release sheets altogether, absorbent articles have been designed having high coefficient of friction backsheets. U.S. Pat. No. 5,011,480 discloses such an article. A high coefficient of friction backsheet is a useful means for maintaining the article's position in the user's undergarment when the undergarment is next to the body, which applies a normal force to the article. When the user's undergarment is away from her body, little to no normal forces are exerted on the article, and the frictional characteristics of the backsheet provide minimal resistance to movement of the article. This allows the article to become shifted or separated from the undergarment when the user urinates or initiates usage of the article for the first time. Shifting can create comfort problems and positioning that is less than optimal for absorbing exudates. Separation may also result in article contamination, requiring the user to discard the article.
SUMMARY OF THE INVENTION
The present invention provides an absorbent article comprising a liquid permeable cover; a substantially tack-free, high coefficient of friction backsheet having at least one tape tab affixed to its outwardly disposed surface; and absorbent material. The tape tab has a fixed end, a free end, a first surface, and a second surface opposite the first surface. The second surface of the tape tab has adhesive and release zones thereon. The tape tab can be folded such that the adhesive and release zones face one another prior to article use. These design features eliminate the need for any release sheet or release coating on a wrapper, and also minimize the use of positioning adhesive. The tape tab comprises a minimum amount of adhesive sufficient to maintain the position of the article when a user's undergarments are away from her body. When the undergarments are near her body, the high coefficient of friction backsheet acts as the predominant means for maintaining the position of the article. The tape tab also provides a hygienic and convenient means of placing and removing the article, eliminating or reducing the need for the consumer to touch any portion of the article that will be used to absorb exudates.
The present invention also provides the above absorbent article in a wrapped configuration wherein a portion of the tape tab extends external to the wrapper, allowing the user to open the wrapped product and separate the article from the wrapper using the tape tab.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1
is a plan view illustrating the backsheet of an article of the present invention comprising two tape tabs, wherein one of the tape tabs is in an extended position, and the second tape tab is folded upon itself.
FIG. 2
is a cross-sectional view taken along line A—A in FIG.
1
.
FIG. 3
is a plan view illustrating the backsheet portion of an article of the present invention comprising two tape tabs extending from longitudinal sides of the article.
FIG. 4
is a plan view illustrating the backsheet of an article of the present invention comprising two tape tabs maintained within the periphery of the article.
FIG. 5
is a plan view of an individually folded and wrapped product of the present invention comprising a tape tab, which extends externally of the wrapper.
FIG. 6
is a cross-sectional view taken along line B—B in FIG.
5
REFERENCES:
patent: 3888255 (1975-06-01), Shah et al.
patent: 4850991 (1989-07-01), Nakamishi et al.
patent: 5011480 (1991-04-01), Gossens et al.
patent: 5217448 (1993-06-01), Glaug et al.
patent: 5591147 (1997-01-01), Couture-Dorschner et al.
patent: 5993430 (1999-11-01), Gossens et al.
patent: 6063065 (2000-05-01), Costa
patent: 6365794 (2002-04-01), Dabi et al.
patent: 6508795 (2003-01-01), Samuelsson et al.
patent: 6524289 (2003-02-01), Larsson et al.
patent: 05103812 (1993-04-01), None
Luizzi, Jr. Joseph Michael
Motta Miriam
Bogart Michael G
Lo Weilun
Mc-Neil-PPC, Inc.
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