Surgery – Means and methods for collecting body fluids or waste material – Absorbent pad for external or internal application and...
Patent
1998-10-09
2000-11-14
Polutta, Mark O.
Surgery
Means and methods for collecting body fluids or waste material
Absorbent pad for external or internal application and...
604386, 24442, A61F 1315
Patent
active
061463698
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION AND RELATED ART
The present invention relates to closures for fastening adjacent portions or edges of materials together. The closures are useful as fastening system closures for disposable diapers.
Diapers of this general type are widely used. A typical diaper construction comprises an absorbent pad or batt or the like enclosed in an outer plastic shell or a non-woven backsheet that is non-woven fabric laminated with a water impermeable layer such as a polyethylene film. A water permeable inner shell or liner is also provided to promote separation of fluid from the user.
The fastener tape system generally includes adhesive tabs fastened to one end of the diaper assembly construction at each lateral side of the diaper in a permanent "factory joint" by the diaper manufacturer using adhesives or other techniques. Heretofore, the tabs typically have a face coated with pressure-sensitive adhesive. The tabs are releasably attachable to the other end of the diaper at each lateral side in a "user joint". The attachment is releasable both to allow permanent removal of the diaper and to allow unfastening to inspect the diaper followed by refastening if indicated.
There is a need for a diaper tab having a user joint with a mechanical closure, and more particularly, an extensible or stretchable tab having such a mechanical closure. Such closures may include Velcro brand closures with mechanical engaging elements. The tab may engage a specially constructed mechanical receiving or engaging location at a landing member or the non-woven backsheet of a disposable diaper. Such mechanical closure members are typically nonextensible since the integral substrate and engaging elements are formed of relatively stiff and nonextensible materials or plastics. These nonextensible materials are used to assure that the engaging elements provide adequate strength and do not merely bend or flex with disengagement loads.
The use of combined adhesive and mechanical fastener systems is shown in U.S. Pat. Nos. 5,019,065, 5,053,028 and 4,869,724. The teachings of all of these patents being incorporated herein by reference.
Related art includes U.S. Pat. Nos. 4,795,456 and 4,834,820.
SUMMARY OF THE INVENTION
The present invention provides an extensible tab fastener system having a user joint that enables mechanical attachment. An extensible facestock cooperates with an ordinarily nonextensible mechanical fastener to form the extensible tab fastener in accordance with the present invention. The nonextensible mechanical fastener is rendered extensible by providing in at least the nonextensible portions thereof a plurality of separation interfaces or parting planes extending through the thickness of the nonextensible portion or portions at spaced locations in the direction of desired extensibility. The tab fastener system may be produced by high speed manufacturing processes.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic view showing apparatus for making stock for conversion to a diaper tab in accordance with the present invention; and
FIG. 2 is a perspective view showing a tab fastener applied to a diaper with the tab in the deployed position ready for closure.
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIG. 1, the production of stock for a diaper tab 10 is schematically shown in a single width size for convenience of illustration. As indicated in dotted outline, the diaper tab 10 is formed by cutting the stock across its width in the cross direction.
Referring to FIG. 2, the diaper tab 10 is shown deployed for closure of a diaper 12. The diaper tab 10 includes a facestock film 14, a mechanical engagement or closure member 16 having a substrate 18 and protuberances or projecting elements 20 extending therefrom.
The facestock film 14 is extensible or stretchable. It may be separately formed by any suitable process and subsequently joined with the other layer portions of the tab 10, or it may be directly extruded onto the substrate 18 of the member 16. The facestock film 14 may be formed of
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Hartman William G.
Hilston Michael D.
Avery Dennison Corporation
Polutta Mark O.
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