|Publication number||US3926191 A|
|Publication date||Dec 16, 1975|
|Filing date||Nov 20, 1974|
|Priority date||Nov 20, 1974|
|Publication number||US 3926191 A, US 3926191A, US-A-3926191, US3926191 A, US3926191A|
|Original Assignee||Johnson & Johnson|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (3), Referenced by (12), Classifications (5)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States Patent 7 U9] Tritsch Dec. 16, 1975 DISPOSABLE DIAPER HAVING ADHESIVE TABS AND RELEASE STRIPS THEREFOR PERMANENTLY ATTACHED AT MARGINAL EDGES OF DIAPER  Inventor: Ludwig Tritsch, Wilmette, 111.
 Assignee: Johnson & Johnson, New
221 Filed: Nov. 20, 1974 21 Appl. No.: 525,607
 US. Cl 128/287; 128/284  Int. Cl. A61F 13/16  Field of Search 128/284, 287, 290 R  References Cited UNITED STATES PATENTS 3,196,874 7/1965 Hrubecky 128/287 3,776,234 12/1973 l-loey 128/287 3,840,013 10/1974 Mesek 128/287 Primary E.raminerAldrich F. Medberry 4 Claims, 4 Drawing Figures Us. Patent 1560. 16, 1975 3,926,191
DISPOSABLE DIAPER HAVING ADHESIVE TABS AND RELEASE STRIPS THEREFOR PERMANENTLY ATTACHED AT MARGINAL EDGES OF DIAPER BACKGROUND OF THE INVENTION This invention relates to disposable diapers. More particularly, this invention relates to disposable diapers adapted to be secured in place by adhesive tabs.
Disposable diapers provide substantial advantages in convenience over diapers intended to be laundered and reused, particularly when they are used away from home. In recent years, many different disposable diapers have been proposed and some have been successful in the marketplace. Typical disposable diaper structures comprise a moisture-retaining layer of high liq uid-holding capacity and a moisture-impervious backing sheet, generally made of a plastic film such as polyethylene film or the like. Typical disposable diaper structures are shown in US. Pat. No. 3,612,055 to Mesek et al. and in US. Pat. No. Re. 26,151 to Duncan et al.
As may be seen from the above-cited patents, it is desirable to obviate the problems that are inherent in closure systems which utilize extraneous fasteners such as safety pins, snaps and Zippers. To this end adhesive closure systems have presented acceptable solutions.
One of the most convenient adhesive systems that has been developed to date is the system, shown in the above-cited patents, in which adhesive tabs are ad hered to the backing sheet extending outwardly from opposite sides of the diaper at one end thereof, and in which the exposed areas of the adhesive strips are pro- -vided with readily separable cover strips which protect the exposed areas until ready for use. However, disposable diapers using an adhesive closure system of this general type have the disadvantage that the consumer has to dispose of the cover strips when they are separated from the adhesive tabs. This is an inconvenience to the consumer who is placing the diaper on a baby at about the same time.
An illustrative prior an adhesive system having cover strips permanently attached to the diaper is disclosed in US. Pat. No. 3,646,937 to Gellert. The Gellert arrangement has the disadvantage of having a release film permanently anchored to the inside surface of the diaper, where it can possibly come into contact with a babys tender skin. Additional disadvantages are the complexities and expense which are added to the manufacturing process by requiring each adhesive closure to be manipulated on the front side, around the edge, and on to the back side of the diaper, instead of handling the adhesive closure on one side only.
SUMMARY OF THE INVENTION In this invention, the adhesive tab which is used to secure the diaper on a baby is attached at one end thereof to a backing sheet of the diaper while the other end of the tab, the free working end, presents a tacky surface facing in the same direction as the diaper inside surface and which is releasably covered by a release-coated surface of a cover strip which, in turn, is permanently attached to the diaper. One end of the cover strip is at tached to the backing sheet of the diaper and the other end is provided with a grippable end tab to facilitate the subsequent separation of the cover strip from the adhesive tab.
BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a perspective view, partly broken away to show interior detail, of an open unfolded diaper in accordance with one embodiment of the invention;
FIG. 2 is a fragmentary cross-sectional view of the diaper of FIG. 1 taken along plane 2-2 and shown on an enlarged scale;
FIG. 3 is a fragmentary cross-sectional view similar to FIG. 2, illustrating an alternate embodiment of the invention; and
FIG. 4 is a perspective view of the diaper of FIG. I in a configuration assumed by the diaper when placed about an infant.
DESCRIPTION OF THE PREFERRED EMBODIMENTS Disposable diaper 10, illustrated in FIGS. 1 and 4, is of substantially quadrilateral configuration and presents inside surface 11 for direction toward an infant and outside surface 12 for direction away from the infant. Adhesive tabs 13 and 14 are attached to diaper 10 for securing diaper 10 about an infant. The tacky adhesive surfaces of tabs 13 and 14 are covered by protective cover strips 15 and 16, respectively, which are permanently attached to respective opposed marginal edges of diaper 10. In FIG. 1, adhesive tab 13 is shown with cover strip 15 partially lifted therefrom, andadhesive tab 14 is shown with cover strip 16 in place and covering the entire adhesive surface of tab 14. The cover strips such as strips 15 and 16 can be made of paper coated on one side with a suitable release coating such as a silicone composition, or they can be made of a smooth polyolefin film provided with a non-tacky surface, or the like.
Diaper 10 comprises a moisture-retaining layer made up of moisture-pervious facing sheet 17, overlying absorbent pad 18, and backing sheet 19 made of a moisture-impervious material. Absorbent pad 18 is somewhat smaller than backing sheet 19 and is centrally disposed thereon; however, pad 18 can be made coextensive with backing sheet 19 if desired. Facing sheet 17 is substantially coextensive with backing sheet 19. Both facing sheet 17 and pad 18 can be anchored to backing sheet 19 by means of adhesive beads 20, or in any other convenient manner. For example, if backing sheet 19 is made of a thermoplastic material, facing sheet 17 and pad 18 can be attached thereto by heat bonding.
Referring to FIG. 2, adhesive tab 14, having fixed end 21 and an outwardly extending free working end 22, is attached to backing sheet 19 on the diaper outside surface by securing fixed end 21 thereto with pressuresensitive adhesive layer 23 which also covers free working end 22. If backing sheet 19 is a thermoplastic web, fixed end 21 can also be attached to backing sheet 19 by heat bonding in which case adhesive layer 23 is coextensive only with free working end 22.
Cover strip 16 extends over that portion of adhesive layer 23 which covers free working end 22 and is releasably held thereon. One end of cover strip 16 is affixed to backing sheet 19 by adhesive bead 24 along the longitudinal margin of diaper I0, and the distal end of cover strip 16 extends longitudinally beyond the tacky surface on free working end 22 and provides flat grippable end tab 25 which facilitates the uncovering of adhesive layer 23 on free working end 22, which faces in the same direction as inside surface 11, when the diaper is prepared for use. When the diaper is applied about the infant, cover strip 16 can be folded out of the way in any convenient manner.
Another embodiment of the present invention is shown in FIG. 3 where adhesive tab 26 comprises fixed end 29 and free working end 33 which is releasably covered by curlable cover sheet 31 having coiled grippable end tab 32. Fixed end 29 is secured to backing sheet 27 by means of pressure-sensitive adhesive layer 30 which also covers free working end 33 and which provides an exposed tacky surface when cover sheet 31 is lifted therefrom. Adhesive bead 34 permanently affixes cover sheet 31 to backing sheet 27 in a manner hereinaboveset forth. Coil 31, shown in phantom and abutting facing sheet 28, illustrates the configuration assumed by cover sheet 31 when that portion of adhe sive layer 30 which covers free working end 33 is exposed. Curlable cover sheet 31 can be made of any suitable material having a memory and to which release properties can be imparted. Illustrative of such materials are prestressed polyethylene terephthalate webs having a non-tacky release surface, release sheets having embedded therein longitudinally-extending strands of coiling material, coiled webs produced by skiving an ultra-high molecular weight polyethylene rod, and the like. In a still further embodiment of this invention only the grippable end tab of the cover sheet can be provided with coiling properties.
Adhesive tabs suitable for the purposes of the present invention can be made from a wide variety of materials, provided that such materials are sufficiently flexible. Particularly preferred materials for this purpose are polyalkylene webs such as polyethylene sheet, polypropylene sheet, and the like.
The pressure-sensitive adhesive layers such as layer 23 and layer 30 are formed by applying a coating of a pressure-sensitive adhesive composition known in the art to the appropriate surfaces of tabs 14 and 26. The applied adhesive shall have good tack, good cohesive strength, good resistance to moisture and good resistance to aging. Illustrative of such adhesive compositions are mixtures of natural or synthetic rubber, zinc oxide, and various resins, also latices of natural or synthetic rubber, or water dispersions of acrylic tacky polymers or copolymers.
Several different types of facing materials may be used for diaper facing sheets 19 and 27. For example, facing sheets 19 and 27 may be made up of a mixture of fibers consisting predominantly of inexpensive short cellulosic fibers such as wood pulp fibers or cotton linters, in amounts of about 75 percent to about 98 percent, the balance being textile length fibers such as rayon as described in U.S. Pat. No. 3,663,348 to Liloia et a1.
Facing sheet materials suitable for use in this invention can have fabric weights in the range of about 1 to oz/yd and densities of less than 0.15 g/cc, generally in the range between 0.05 and 0.1 g/cc. The dry strength of the facing sheet for fabric having a weight of about 1.5 oz/yd is at least 0.15 lbs/in of width in the machine direction and at least 0.1 lbs/in of width in the cross direction. Such fabrics have unusually good elongation, loft, softness, and drape characteristics in comparison to prior products incorporating any substantial amount of short fibers.
Facing sheets 19 and 27 may also be made of an apertured, nonwoven fabric which is formed, for example,
4 in accordance with the teachings of commonly assigned U.S. Pat. Nos. 2,862,251; 3,081,514; and 3,081,515. Briefly, such fabrics are foraminous structures wherein groups or groupings of fibers have been rearranged from a fibrous nonwoven starting web into positions surrounding less dense fabric portions by passage of a fluid through the starting material. The fibers within the groupings are mechanically interlocked, and may be arranged into various patterns, as is well known by those skilled in the art. A suitable binder may be utilized to help retain the fibers in their rearranged locations, as is also well known by those skilled in the art. The fabric can be made of naturally occurring fibers, synthetic fibers, or blends thereof. Typical facing sheets made of a polyester type material can have a weight of about 0.75 oz/yd In addition, facing sheets 17 and 28 can be formed of a nonaperatured material, such as a nonwoven isotropic web, or the like. In all of the aforementioned facing materials, the material should be relatively hydrophobic so as to retard wicking within the facing layer.
Highly moisture-absorbent fibrous pad or batt 18, which usually is substantially rectangular in shape but smaller than the facing sheet and the backing sheet, can be formed in accordance with the teachings of U.S. Pat. No. 3,612,055 to Mesek et a1. If desired, a highly moisture-absorbent layer can be provided substantially coextensive with the backing sheet and the facing sheet.
A suitable backing sheet material for the diapers embodying the present invention can be an opaque polyethylene web about 0.001 inch thick. Another suitable material for this purpose is a polyethylene terephthalate web having a thickness of about 0.0005 inch. Typical disposable diapers which can be fitted with tab-type adhesive fasteners described hereinabove are shown in U.S. Pat. No. 3,612,055 to Mesek et al. and in U.S. Pat. No. 3,683 ,916 to Mesek et al. Other suitable disposable diaper structures which can be improved by the present tab-type fasteners are shown in U.S. Pat. No. Re. 26,151 to Duncan et al.
In use, a diaper equipped with the adhesive fasteners of the present invention is applied to the infant by laying out the diaper on a suitable flat surface and placing the infant thereon so that the waist-underlying end of the diaper is that having the fastener means. The other end of the diaper then extends downwardly between the infants legs. Next, the downwardly-extending end of the diaper is brought up between the infants legs to a position contiguous with the front of the infants waist. The diaper is thereafter secured to the infant by placing the corners of the waist portion of the abdomen-covering end as far around the infants waist as they will go and by bringing the corners of the underlying end of the diaper into an overlapping relationship with the aforementioned corners so that the diaper snugly encircles the infants waist and provides a custom fit. The adhesive fasteners are then prepared for use by grasping cover strip terminal portions such as flat portion 25 or coiled portion 32 and pulling the cover strip away from the adhesive surface on the free end of the adhesive tab. The tabs are then used to secure the diaper in the desired position by simply urging the pressure-sensitive adhesive surfaces in contact with the adjacent outer surface of the diaper.
The foregoing description and the drawing are illustrative but are not to be taken as limiting. Still other variations and modifications are possible without departing from the spirit and scope of the present invention.
1. In combination with a disposable diaper having an inside surface for direction toward an infant when the 6 1 said cover strip extending longitudinally beyond said tacky surface and being permanently attached to said backing sheet at a marginal location thereof. 2. The combination in accordance with claim 1 diaper is worn by that infant and an outside surface for 5 wherein that portion of the cover strip which extends direction away from said infant and provided with a moisture-retaining layer and a moisture-impervious backing sheet, an improved adhesive tab having a fixed end secured to said backing sheet on the outside surface of the diaper and at a marginal location thereof, and an outwardly extending free end provided with a tacky surface facing in the same direction as said inside surface; and a cover strip provided with a release coating on one surface thereof, releasably attached to, and covering said tacky surface;
longitudinally beyond said tacky surface is flat and provides a grippable end tab.
3. The combination in accordance with claim 1 wherein that portion of the cover strip which extends longitudinally beyond said tacky surface is coiled and provides a grippable end tab.
4. The combination in accordance with claim 1 wherein said cover strip is curlable and forms a coil upon lifting from said tacky surface.
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|US5860965 *||Nov 8, 1996||Jan 19, 1999||The Procter & Gamble Company||Absorbent article having a releasable adhesive patch|
|US6648866 *||Nov 26, 2001||Nov 18, 2003||The Procter & Gamble Company||Absorbent article fastening device|
|USRE40247||Apr 21, 2004||Apr 15, 2008||The Procter & Gamble Company||Absorbent article fastening device|
|WO1992017139A1 *||Mar 23, 1992||Oct 15, 1992||Minnesota Mining And Manufacturing Company||Sanitary napkin|
|International Classification||A61F13/58, A61F13/56|