Stock material or miscellaneous articles – Structurally defined web or sheet – Including aperture
Reexamination Certificate
1999-01-14
2001-08-07
Cole, Elizabeth M. (Department: 1771)
Stock material or miscellaneous articles
Structurally defined web or sheet
Including aperture
C428S153000, C428S154000, C428S156000
Reexamination Certificate
active
06270875
ABSTRACT:
FIELD OF THE INVETION
The present invention is related to disposable wiping articles, and more particularly to disposable wiping articles having two or more layers.
BACKGROUND OF TIE INVENTION
Disposable wiping articles are well known in the art. Such wiping articles typically have a substrate which includes one or more materials or layers. The substrate can be pre-moistened with a wetting agent prior to use, or alternatively, can be combined with a liquid at the point of use of the article. Pre-moistened wiping articles are also referred to as “wet wipes” and “towelettes.”
Desirable features of such wiping articles include texture, caliper (thickness) and bulk (volume per unit weight). A relatively high value of texture is desirable for aiding in cleaning of surfaces. Wipe structures that result in increased texture upon wetting are particularly beneficial. Such structures may be achieved by utilizing multiple layers having differential wet extensibility. One such structure is disclosed in U.S. Pat. No. 4,469,735 issued Sep. 4, 1984 to Trokhan. However, increased texture does. not necessarily produce increased caliper. Relatively high values of caliper and bulk are desirable for providing volume in the article for receiving and containing liquids.
In addition to physical features such as texture, caliper, and bulk, other desirable properties of a wiping article include its propensity to create foam, its ability to maintain directional fluid flow, and its strength. For example, when used as a facial wipe, certain lotions or cleansers may be used with the wipe, and it would be desirable to generate a lather with the wipe. When used with a hard surface cleaner, for example on kitchen countertops, it would be desirable for the wipe to help produce sudsing of the detergent or surfactant. For entrapment of dirt, grime, and the like, it would be helpful if the wipe had the built-in ability to capture dirt, much like a filter. For all wiping tasks, particularly wet wiping, improved wet strength is beneficial. Wet strength is especially important for scrubbing applications.
Accordingly, it would be desirable to provide a disposable wiping article that exhibits increased texture and bulk upon wetting.
Additionally, it would be desirable to provide a disposable wiping article having a propensity to aid in generation of foam, suds, or lather in applications involving cleansers, detergents, lotions, and the like.
Additionally, it would be desirable to provide a disposable wiping article having a propensity to aid in entrapment of dirt, grime, and the like, upon wiping.
Further, it would be desirable to provide a disposable wiping article which has improved wet strength in wet wiping applications.
SUMMARY OF THE INVETION
The present invention provides a multiple layer disposable wiping article. The wiping article includes at least at least two layers, or plies. The first layer is extensible in a plane of the first layer when wetted. The second layer comprises a plastic film which is less extensible when wetted than the first layer. Selected portions of the first layer are joined to the second layer to inhibit wet extension of the first layer in the plane of the first layer.
When the first layer is wetted, the second layer constrains extension of the first layer in the plane of the first layer. As a result, the first layer deforms, such as by buckling or puckering, in the Z-direction (perpendicular to the plane of the first layer).
The first layer can comprise a wetting agent prior to use of the article, which provides wetting of the first layer. The wetting agent can be an aqueous lotion. Preferably, selected portions of the first layer are joined to the second layer in a predetermined bonding pattern to provide a plurality of unbonded regions of the first layer.
The second layer preferably comprises a three dimensional formed film having a caliper of about 20 mils (0.020 inch). The three dimensional film can provide caliper, bulk, and texture independent of the caliper, bulk, and texture provided by puckering of the first layer. The plastic film can be a macroscopically expanded three dimensional plastic film.
In one embodiment, the disposable wiping article comprises three layers: a first cellulosic layer, a second layer comprising a three dimensional apertured plastic film and an apertured third layer. The third layer can comprise a dry creped, aperturedt web of cellulosic fibers. The second layer is disposed intermediate the first layer and the third layer. The apertures in the third layer can be larger than the apertures in this second layer to provide two stage filtering of small particles.
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Bullock Roddy M.
Cole Elizabeth M.
The Procter & Gamble & Company
Tucker Joan B.
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