|Publication number||US3881490 A|
|Publication date||6 May 1975|
|Filing date||20 Dec 1973|
|Priority date||20 Dec 1973|
|Also published as||CA1031503A, CA1031503A1, DE2460712A1, DE2460712B2|
|Publication number||US 3881490 A, US 3881490A, US-A-3881490, US3881490 A, US3881490A|
|Inventors||Howard A Whitehead, Ralph V Braun|
|Original Assignee||Kimberly Clark Co|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (5), Referenced by (155), Classifications (22)|
|External Links: USPTO, USPTO Assignment, Espacenet|
O United States Patent 1 [111 3,881,490 Whitehead et al. May 6, 1975 THIN, FLEXIBLE ABSORBENT PADS  ABSTRACT Inventors: whitehead, Appleton; Thin, absorbent pads with soft, flexible edges. The pad lp Bmlln, Neenah, bQth of structure comprises a fluid pervious non-woven cover sheet, a central absorbent batt of comminuted wood  Assignee: Kimberly-Clark Corporation, pulp fibers, and a fluid-impervious backing element. Neenah, Each element is coextensive with the others. The integrity of the central absorbent batt is maintained in Flledi 1973 the x and y directions by adhering the cover sheet and  Appl. No.: 426,521 fluid impervious backing element to the respective top and bottom surfaces of the central batt by light applications of flexible adhesive, and in the z direction by Cl 128/290 R; 161/DIG- 3 hydrogen bonding of the wood pulp fibers in selected  Int. Cl. A6lf 13/16 areas Th lected areas of hydrogen bonding com- Field of Search 123/287, 290 R, 290 P, prise a spaced pattern of embossment lines which ex- 128/156; 161/66, 67, 79, 3 tend generally longitudinally of the pad and intersect the edges and ends of the pad at spaced intervals. The References Cited pad may be adapted for secure placement on a suit- UNITED STATES PATENTS able support such as a snug-fitting undergarment by 2,788,003 4 1957 Morin 128/284 the use of Pressure Sensitive adhesive on the backing 3 5 3 243 2 971 Lindquist 123/237 element or by increasing the frictional properties of 3,595,237 7/1971 Sargent et al.. 128/290 R the bottom side by the use of flexible foam or other 3,670,731 6/1972 Harmon 128/284 friction increasing materials, 3,693,622 9/1972 Jones, Sr 128/284 X Primary Examiner-Richard A. Gaudet Assistant Examiner--J. Yasko Attorney, Agent, or Firm--Daniel J. Hanlon, Jr.; William D. Herrick; Raymond J. Miller 9 Claims, 5 Drawing Figures TENTEBHAY 61975 3,881,490
sum 10F 2 FIG. I FIG. 2
mgmmm ems 3.881 #490 SHEET 2 0F 2 THIN, FLEXIBLE ABSORBENT PADS BACKGROUND OF THE INVENTION This invention relates to improvements in the structure of very thin absorbent pads primarily for feminine hygiene which may be used for undergarment protection between menstrual periods as well as for absorbing light flow between and during periods.
There are a number of prior art patents relating to thin absorbent pads for the above purposes. The pad structure defined in these patents broadly fall into two categories. One in which the main absorbent medium comprises multiple plies of creped absorbent tissue commonly called cellulose wadding, and the other in which the main absorbent medium is an airformed batt of comminuted wood pulp fibers commonly known as fluff.
This invention relates to improvements in the latter type of pad in which the main absorbent medium is fluff.
In prior art pads where fluff is the main absorbent component, it has always been considered necessary to confine or bind the short wood pulp fluff fibers in some way to prevent undesirable dusting of the short fibers which would otherwise occur. One common way of accomplishing this is to enclose the fluff batt in a tissue or nonwoven wrap as is taught for example in U.S. Pat. No. 2,826,200 issued Mar. II, 1958. Another way to prevent dusting is to cover the tops, sides and ends of the pad with a nonwoven wrapper as shown in US. Pat. No. 3,575,175 issued Apr. 20, l97l. Still another way is to cover or adhesively bind the surface fibers and then seal all the pad edges by highly compressing the pad around its entire periphery as taught in British Pat. No. 1.07 l ,l9l published Jun. 7, 1967. Adhesive binder to secure all or part of the fluff fibers to each other has also been used in combination with some of the above structures.
While the above structures do accomplish the job of fiber confinement in various ways and do minimize or prevent dusting out of the fibers, some disadvantages in comfort and disposability remain when such structures are used for absorbent pads which contact the body as in feminine hygiene uses. In addition the cost of the confining elements special adhesive combination and multiple operations necessary to assemble the prior art pads add undesirably to the final cost of the product.
An encircling outerwrap of nonwoven material with an all fluff central batt and a thin film baffle for example, is relatively quite an expensive component when very thin pads are involved. In addition because of the inherent flexibility of thin pads, such wrappers tend to wrinkle excessively at the fold lines along the pad edges when the pad is arcuately bent into the usual shape which results when worn for catamenial uses.
When, as taught in the prior art, the entire periphery of the pad is compacted or compressed sufficiently to seal the edges with or without supplementary adhesive, relatively harsh and sharp edges are formed which, because of the resulting cardboard-like structure, tend to wrinkle and form undesirable abrasive edges during use. Continuous peripheral embossing also limits the thickness of the absorbent element which can be satisfactorily used and still remain sealed at the edges.
In the structure disclosed herein it has been found that a suitable pad can be provided, in which the short fibered fluff comprising the absorbent material in the central pad terminates at the peripheral edges without employing an enclosing wrapper or continuous peripheral sealing. The pad described herein can also be produced at low cost. While the resulting pad may dust moderately at the unbonded edge areas this slight disadvantage is overshadowed by the more important advantage of providing comfortable soft edges for the user. In emergencies, the pad may also be disposed of in a toilet since the main fluff element will delaminate and break apart as water destroys the hydrogen bonding in the embossed line areas hereinafter described thus permitting dispersion of the major portion of the fibers when the pad is agitated in water during the flushing action.
SUMMARY OF THE INVENTION The pad of this invention comprises a thin elongate air felted absorbent batt of intermingled wood fluff fibers, a fluid pervious nonwoven cover sheet and a fluid impervious film backing sheet. The absorbent batt, cover sheet and backing film are all coextensive with each other.
The nonwoven cover sheet may be any of the many known types of pervious non-woven materials in common use as wrappers for sanitary napkins, the most common of which comprises carded rayon fibers of staple length bonded by a flexible adhesive.
In the preferred embodiment, the entire undersurface of the cover sheet is secured to the top of the fluff batt by a very thin adhesive layer. Preferably, the adhesive is applied to the top surface fibers of the fluff batt in the form of an atomized spray of aqueous based adhesive prior to placing the cover sheet material onto the batt.
The cover sheet is then placed on top of the sprayed batt and the fibers in the fluff batt are caused to bond to the cover sheet by the simultaneous application of heat and pressure. While moderate overall pressure is applied to bond the cover sheet to the batt, a critical consideration is to bond the fibers in selected areas by using heavy pressure sufficient to provide hydrogen bonding in areas defined by a pattern of narrow spaced lines of compression. Many suitable patterns may be used. A particularly preferred pattern comprises spaced longitudinally extending lines arranged in a sinuous pattern with the lines terminating at points spaced from each other around the pad periphery. The spacing between the lines of compression and the width of the lines is preferably such that the non-woven cover area between lines is not highly stressed in order that the batt areas between lines remains substantially uncompressed and thus provide soft, resilient, cushioned areas. Another important consideration is that the primary direction of the impressed lines be in the longitudinal direction of the pad and that the major portion of the edge area of the pad remain unbonded to retain its softness and resiliency.
After the batt and overlying cover sheet are integrated by heat and pressure, and the fluff fibers are hydrogen bonded by line embossing, the embossed pad structure is secured to a plastic film backing to complete the pad structure. Preferably such securement is obtained by an intermittent pattern of adhesive applied to the surface of the underlying film, with the spacing between adhesive areas being sufficient to permit easy flexing of the completed pad structure.
The completed pad may be used in combination with a tight fitting undergarment without supplementary attachment means if desired. Preferably, however, pressure sensitive adhesive is disposed on a portion of the bottom surface of the plastic film and covered with a removable protective strip which may be peeled off by the user for more positive attachment purposes. The bottom surface may alternatively be provided with a thin, flexible, high friction material such as synthetic sponge of polyurethane or the like which will help retain it in position on an undergarment by frictional engagement therewith.
BRIEF DESCRIPTION OF THE DRAWINGS In the drawings:
FIG. 1 is a plan view of one embodiment of the pad of the invention.
FIG. 2 is a plan view of a modified pad shape.
FIG. 3 is an enlarged section taken along line 33 of FIG. 1.
FIG. 4 is a section similar to FIG. 3 showing a modification thereof.
FIG. 5 is a perspective view of the bottom of another embodiment of the pad.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [n the plan view of FIG. 1 there is shown a substantially elliptical pad having a top cover sheet 12 of nonwoven material with a pattern of spaced longitudinally extending line embossments l4 impressed therein. Undulating line embossments 14 extend the full length of the pad and intersect the ends and edges of the pad at intervals indicated at 15, leaving major portions 16 of the periphery unembossed and therefore unbonded in the z-direction.
FIG. 2 illustrates an oblong tapered pad with undulating line embossments 14 of a similar nature.
The internal structure of the pad is shown in FIG. 3 which is an enlarged section taken along line 3--3 of FIG. 1. As shown therein, fiber batt 17 of absorbent wood pulp fibers is heavily compressed along line embossments 14 and by being so heavily compressed provide hydrogen bonding of the wood pulp fibers in areas 18. It is this hydrogen bonding which provides the fluff batt 17 with sufficient integrity to prevent delamination in the z-direction. Cover sheet 12 is puffed up in rounded cushion-like contours between the line embossments l4'where uncompressed and unbonded portions of fiber batt 17 press upwardly against cover sheet 12 between embossments.
Backing element 19 is a thin film, such as polyethylene, which is adhesively attached to batt l7 and which film retains its substantially planar configuration.
Cover sheet 12 is bonded to batt 17 over its entire common interface with batt 17 by a light layer of adhesive applied as hereinafter described, while film backing element 19 is intermittently bonded to the bottom surface of batt 17 by a spaced pattern of adhesive printed on the upper surface of the film 19 before assembling the pad into its final form.
Referring again to FIG. 1, unbonded edge portions 16 also retain a plumped up cushion-like configuration similar to that shown between embossments in FIG. 3 and thereby provide the pad with the desired soft edges.
The FIG. 4 pad structure is the same as that of the FIG. 3 pad except that a layer of lightweight synthetic sponge 20 such as polyurethane foam is additionally laminated to the backing element 19. The foam 20 provides a high friction surface which assists in maintaining the pad in place when the pad is worn with a tightfitting undergarment.
In FIG. 5 a perspective view of the underside of a completed pad is shown wherein another means for attaching the pad to an undergarment is illustrated. As shown in FIG. 5 the backing element 19 has applied thereto a narrow band of pressure sensitive adhesive 22 which is covered by a peelable strip of protective release paper 24 or the like.
When the FIG. 5 pad is worn in combination with an undergarment, protective strip 24 is first peeled off and the exposed pressure sensitive adhesive 22 is then utilized to adhere the pad to the crotch area of the undergarment. Generally, the use of pressure sensitive attachment means for absorbent pads is well known in the art and is disclosed herein merely as a preferred embodiment.
While only two pad shapes are illustrated in the drawings, it is understood that various other elongate configurations may be used including a variety of geometric forms such as rectangular, oblate, diamond, hexagonal and the like.
Additionally while the line embossments are shown as uniformly spaced and substantially parallel undulating lines, other longitudinally extending patterns may be used. Important considerations are: that the lines be spaced sufficiently apart to prevent undue compression of the batt between lines; that the compressed bonded areas be of narrow width for the same reason; that they extend substantially longitudinally of the pad; and that where they intercept the edges they be spaced from one another to minimize edge compression or bonding. Typical dimensions for the line embossments comprise a width of about 1/32 inch and a spacing of about inch to 3/8 inch. An objective of the line embossing arrangement, in addition to providing the hydrogen bonding which is the primary means for providing z direction integrity in the pads, is to provide the entire surface of the pad including the edges with a soft, cushionlike structure.
Another objective of the line embossments is to direct the migration of the absorbed flow in the longitudinal direction especially since the edges of the pad are unsealed and it is therefore desirable to keep any of the absorbed fluid away from these edges as long as possible. The longitudinally extending embossments serve this purpose well as conduits which due to their compressed condition provide small pores in the batt which enhance capillary suction pressures.
Undulating or wavy lines are also preferred for the line embossments because when the pad is bent into its arcuate shape during use, the wavy or undulating lines were found to flex much more readily than straight lines do and thus produce only small scale wrinkles which do not appear to interfere with tactile comfort as large scale wrinkles have been found to do.
As indicated throughout this specification, the primary purpose of the line embossing is to bind the short wood pulp fibers together by means of hydrogen bonding. As is well known in the papermaking art, hydrogen bonding of wood pulp fibers are bonds which develop when the hydroxyl groups of adjacent fibrillae in the cellulosic fibers form hydrogen bonds when a paper web is dried. In this instance the bonds are formed during the embossing process. Such bonding is also the sole means for maintaining the strength and integrity of the batt in the z direction in the pads disclosed herein. Sufficient strength and integrity in the x and y directions are of course provided by the adhesive attachment of the cover sheet and backing element to the batt as previously described. The .r, y. and z designations are used herein in the customary manner, i.e., and y are the transverse and longitudinal directions respectively, while the z direction is perpendicular thereto.
A suitable method for fabricating the pads will now be described. In manufacturing the pads a thin uniform continuous batt of intermingled wood pulp fibers is first formed by suitable airlaying methods. Many methods for airlaying wood fibers are known, so there is no need to describe such methods here. It is also well known that airlaid batts have little self integrity because even though the fibers in the batt are intermingled, no chemical bonding is developed in dry forming and since the fibers are so short little tensile strength is derived from mere mechanical entanglement. Airlaid batts are therefore very weak and easily destroyed when tensile forces are applied. To obtain batts with structural integrity some supplementary bonding means is therefore required. This is particularly true when the batt is thin, i.e., in the range of 1/1 6 inch to A thick as used herein.
Because of the inherent structural weakness of unbonded airlaid batts it is therefore necessary during subsequent converting operations for the formed batt to be carried on suitable supporting means such as the wire mesh fabric on which it is formed during the airlaying process. Alternatively, the batt could be formed on woven or non-woven scrim which could then be retained with the batt and become an integral part of the finished pad, if desired. However, the latter modifications adds to the final cost. and since these pads are intended to be disposable low cost pads, the inclusion of scrim may not be desirable from a cost standpoint.
After the batt is formed it is sprayed with a light application of an atomized spray of an aqueous-based flexible adhesive. Amounts in the range of 5 to grams per square yard are appropriate. In general, acrylic latexes are preferred for use as the adhesive. It is desirable to use latexes or other aqueous-based adhesives because it is necessary to moisturize the wood fluff fibers at some stage in the process in order to obtain the previously mentioned hydrogen bonding, and aqueous-based adhesives facilitate this.
After the adhesive is sprayed onto the batt, a cover sheet of fluid-pervious non-woven material is then applied to the surface of the batt on which the adhesive has been sprayed. This laminate is lightly pressed between two rolls to slightly adhere the cover sheet and batt and is next passed under a bank of infrared lamps or other heating means to partially set the adhesive and to help condition the batt to a point where the moisture is uniformly distributed through the batt in the amount of about 10 to percent by weight. Further moisture conditioning of the laminate may be done before embossing by spraying the laminate with water at this point in the process. The laminate is then passed through a high pressure nip comprised of a top embossing roll having the desired pattern and a lower heated roll. As the conditioned laminate is passed through the nip, the high pressure exerted on the moistureconditioned batt by the raised land areas of the embossing roll develops the hydrogen bonding of the fibers in only the compressed area of the batt. Nip pressures in the range of about -85 psi and temperatures of about 300 to 350F are suitable for this purpose. Heat is utilized to help drive off residual moisture and to further set the adhesive. The preferred density of the batt in the compressed and hydrogen bonded areas is in the range of about 0.40 grams per cubic centimeter to about 1.0 grams per cubic centimeter. In the uncompressed areas preferred densities are approximately 0.03 grams per cubic centimeter to about 0.15 grams per cubic centimeter.
The laminated batt and cover sheet are then passed through another light pressure nip where a film backing element having a patterned adhesive on the surface is applied to the bottom of the batt to complete the laminated structure.
The continuous laminate then goes through further processing machinery where pads of the desired shape and dimension are cut out, and where pressure sensitive adhesive or friction increasing means may also be applied to the bottom surface.
The hydrogen bonding along the embossed lines, which is provided during fabrication, has been found to be of sufficient strength to retain the integrity of the batt, and thus the entire structure, during normal use. In the event the pad is disposed of in a toilet, or inadvertently dropped therein, these hydrogen bonds are swiftly destroyed as the water penetrates the batt. The batt will then delaminate and permit the major portion of the wood pulp fibers to disperse during normal flush-' ing action. The cover sheet and backing element, of course, will not disperse but they are considered sufficiently flexible to pass through a normally functioning toilet system without difficulty.
While acrylic latexes are preferred for use as the bonding material between the cover sheet and the batt and also to secure the batt to the backing element, other flexible adhesives of similar nature may be used. Suitable adhesives, among the acrylics for example, included ethyl and methyl acrylates and their copolymers, and copolymers of ethyl acrylates, acrylamides and acrylic acid. Other suitable adhesives include vinyl resins such as vinyl acetates and vinyl chlorides and combinations thereof, other synthetic latexes such as butadiene, acrylonitrile and styrene and copolymers thereof, natural gums, starches and the like. Aqueous based adhesives are preferred of course for reasons mentioned earlier. That is, in order for the hydrogen bonding to occur, the batt must be properly conditioned with moisture, and the light spray application of an aqueous-based adhesive assists in achieving this purpose. A surfactant may be added to the latex in amounts of 4 to 5 percent by weight based on latex solids in order to maintain absorbency. Any suitable surfactants may be employed for this purpose. Particularly suitable are sulfated or sulfonated organic compounds representative of which are the sodium diamyl to sodium dioctyl sulfosuccinates, sodium lauryl sulfates, sodium sulfoethyl methyl oleyl amides, and sodium sulfonates of alkylated phenols or benzenes. When any of these are employed they should be nontoxic in nature, of course.
While the pad may be used in its basic form, it is preferred that it be provided with some garment attachment means. A preferred means is a strip of pressuresensitive adhesive as described with respect to FIG. 5. A thin, flexible foam layer such as polyurethane may also be used. Patches of friction increasing hot melts or the like may also be used.
The cover sheet may also be comprised of various materials and still function. A preferred material is a non-woven web of stable length rayon fibers. Other fibers including absorbent and non-absorbent synthetics may be used. Spunbonded webs of continuous filaments such as polyethylene, polypropylene, polyesters, nylon and the like may also be used. When the latter hydrophobic webs are used the pad retains a much drier surface when in use and such webs are sometimes preferred for that reason.
What is claimed is:
1. An elongate thin absorbent pad with soft flexible edges, said pad comprising a fluid pervious cover sheet of non-woven fibers, a central absorbent batt of comminuted wood pulp fibers, and a fluid impervious backing element; said cover sheet, absorbent batt, and backing element being coextensive; the entire undersurface of said cover sheet being secured to said batt by a light overall layer of flexible adhesive which does not penetrate into the batt; said cover sheet and said batt having a spaced pattern of line embossments impressed therein; said line embossments extending primarily in the longitudinal direction of said pad and intersecting the edges and ends of said pad at spaced intervals; said line embossments defining areas of said batt in which the fibers have been moisture conditioned and sufficiently compacted in the z direction to form hydrogen bonds between those fibers disposed in said line embossment areas; said backing element being secured to the bottom of said batt by discrete adhesive segments disposed in a spaced pattern; the adhesive between said cover sheet and said backing element respectively serving to attach only the respective surface fibers of the batt to said cover sheet and backing element in the adhesive areas; the integrity of said batt in the z direction between cover sheet and backing sheet being provided solely by said hydrogen bonding; and the fibers in the ends and edges of said batt being free of z-direction bonding except where intersected by said line embossments.
2. The absorbent pad of claim 1 wherein said batt has a thickness in the range of about 1/16 inch to about /4 inch.
3. The absorbent pad of claim 1 wherein said line embossments have an undulating configuration.
4. The absorbent pad of claim 1 wherein the density of said batt in the area of said line embossments is in the range of about 0.4 grams per cubic centimeter to about 1.0 grams per cubic centimeter.
5. The absorbent pad of claim 4 wherein the density of said batt in the area between said line embossments is in the range of about 0.03 grams per cubic centimeter to about 0.15 grams per cubic centimeter.
6. The absorbent pad of claim 1 wherein said fluid impervious backing element is a thin plastic film.
7. The absorbent pad of claim 1 wherein said backing element has an area of pressure sensitive adhesive applied to the lower surface thereof and wherein said area of adhesive is covered with a removable protective sheet.
8. The absorbent pad of claim 1 wherein said backing element has applied to its lower surface a frictionincreasing material.
9. The absorbent pad of claim 8 wherein said friction increasing material is a thin layer of flexible plastic foam.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US2788003 *||6 Jun 1955||9 Apr 1957||Chicopee Mfg Corp||Disposable absorbent pad|
|US3563243 *||19 Jan 1968||16 Feb 1971||Johnson & Johnson||Absorbent pad|
|US3595237 *||6 Oct 1969||27 Jul 1971||Personal Products Co||Adhesive attachment of removable protective liners for nether garments|
|US3670731 *||20 May 1966||20 Jun 1972||Johnson & Johnson||Absorbent product containing a hydrocolloidal composition|
|US3693622 *||14 Aug 1970||26 Sep 1972||Jones Sr John L||Waste fluid flow control element|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US4059114 *||22 Oct 1976||22 Nov 1977||Minnesota Mining And Manufacturing Company||Garment shield|
|US4079739 *||27 Dec 1976||21 Mar 1978||Kimberly-Clark Corporation||Die-cut contoured catamenial napkin of multi-layered construction|
|US4145464 *||15 Oct 1976||20 Mar 1979||Scott Paper Company||Absorbent articles|
|US4213459 *||12 May 1978||22 Jul 1980||Kimberly-Clark Corporation||Disposable diaper with localized area of increased density|
|US4285343 *||16 Oct 1979||25 Aug 1981||Mcnair Rosetta M||Sanitary napkin|
|US4376440 *||5 Aug 1980||15 Mar 1983||Kimberly-Clark Corporation||Sanitary napkin with adhesive attachment means|
|US4393521 *||6 Apr 1981||19 Jul 1983||Jones Carolyn R||Disposable garment shield and method of manufacture|
|US4397644 *||4 Feb 1982||9 Aug 1983||Kimberly-Clark Corporation||Sanitary napkin with improved comfort|
|US4518451 *||2 Sep 1982||21 May 1985||Personal Products Company||Embossed panty liner|
|US4624666 *||20 Jul 1984||25 Nov 1986||Personal Products Company||Channeled napkin with dry cover|
|US4650481 *||22 Feb 1985||17 Mar 1987||Kimberly-Clark Corporation||Crinkled, quilted absorbent pad|
|US4758241 *||18 Jun 1987||19 Jul 1988||Papajohn Elissa D||Menstrual and incontinence pad|
|US4824718 *||4 Dec 1987||25 Apr 1989||Minnesota Mining And Manufacturing Company||Porous film|
|US4834739 *||17 Dec 1987||30 May 1989||Kimberly-Clark Corporation||External feminine protection device with skid-resistant coating for holding the device in place|
|US4850991 *||10 Sep 1987||25 Jul 1989||Kao Corporation||Absorbent article|
|US4882213 *||29 Apr 1988||21 Nov 1989||Weyerhaeuser Company||Absorbent article with tear line guide|
|US4885200 *||29 Apr 1988||5 Dec 1989||Weyerhaeuser Company||Infant car seat liner|
|US4886697 *||29 Apr 1988||12 Dec 1989||Weyerhaeuser Company||Thermoplastic material containing absorbent pad or other article|
|US4891454 *||29 Apr 1988||2 Jan 1990||Weyerhaeuser Company||Infant car seat liner|
|US4892535 *||7 Aug 1987||9 Jan 1990||Landstingens Inkopscentral, Lic, Ekonomisk Forening||Absorbent pad and method and apparatus for making the same|
|US4892769 *||29 Apr 1988||9 Jan 1990||Weyerhaeuser Company||Fire resistant thermoplastic material containing absorbent article|
|US4900377 *||29 Apr 1988||13 Feb 1990||Weyerhaeuser Company||Method of making a limited life pad|
|US4902553 *||18 Nov 1988||20 Feb 1990||Minnesota Mining And Manufacturing Company||Disposable products|
|US4950264 *||4 Jan 1989||21 Aug 1990||The Procter & Gamble Company||Thin, flexible sanitary napkin|
|US4961930 *||29 Apr 1988||9 Oct 1990||Weyerhaeuser Company||Pet pad of thermoplastic containing materials with insecticide|
|US4967758 *||8 Dec 1988||6 Nov 1990||Prospect Holdings, Inc.||Disposable cover/liner for blood pressure measuring devices|
|US4997082 *||16 May 1989||5 Mar 1991||Kimberly-Clark Corporation||Humidistat|
|US5009653 *||20 Aug 1990||23 Apr 1991||The Procter & Gamble Company||Thin, flexible sanitary napkin|
|US5025504 *||16 Dec 1988||25 Jun 1991||Weyerhaeuser Company||Liner for a helmet, hat, cap or other head covering|
|US5092860 *||7 Dec 1990||3 Mar 1992||Kaysersberg, Sa||Sanitary napkin|
|US5248309 *||20 Mar 1992||28 Sep 1993||Kimberly-Clark Corporation||Thin sanitary napkin having a central absorbent zone and a method of forming the napkin|
|US5308673 *||7 May 1992||3 May 1994||Minnesota Mining And Manufacturing Company||Stitchbonded absorbent articles and method of making same|
|US5310590 *||4 Feb 1993||10 May 1994||Minnesota Mining And Manufacturing Company||Stitchbonded articles|
|US5346485 *||30 Apr 1993||13 Sep 1994||Kimberly-Clark Corporation||Polymeric composition for the absorption of proteinaceous fluids|
|US5360419 *||8 Dec 1989||1 Nov 1994||Kimberly-Clark Corporation||Absorbent structure possessing improved integrity|
|US5360504 *||28 Apr 1993||1 Nov 1994||Kimberly-Clark Corporation||Method of bonding an adhesive to foam|
|US5368668 *||2 Mar 1994||29 Nov 1994||Minnesota Mining And Manufacturing Company||Stitchbonded absorbent articles and method of making same|
|US5383869 *||8 Oct 1992||24 Jan 1995||The Procter & Gamble Company||Thin, flexible sanitary napkin|
|US5429630 *||29 May 1992||4 Jul 1995||Kimberly-Clark Corporation||Absorbent article and a method of removing said article from an undergarment|
|US5466232 *||20 Nov 1992||14 Nov 1995||Johnson & Johnson Inc.||Unitized sanitary napkin|
|US5489283 *||1 Dec 1993||6 Feb 1996||The Procter & Gamble Company||Shaped sanitary napkin with flaps|
|US5514120 *||22 Aug 1993||7 May 1996||Minnesota Mining And Manufacturing Company||Liquid management member for absorbent articles|
|US5543004 *||2 Mar 1994||6 Aug 1996||Minnesota Mining And Manufacturing Company||Stitchbonded articles and method of making same|
|US5575786 *||26 Sep 1994||19 Nov 1996||Osborn, Iii; Thomas W.||Thin sanitary napkin|
|US5609588 *||8 Jun 1994||11 Mar 1997||Kimberly-Clark Corporation||Article having a non-absorbent resilient layer|
|US5635239 *||27 Jul 1994||3 Jun 1997||Kimberly-Clark Worldwide, Inc.||Absorbent structure possessing improved integrity|
|US5713886 *||1 Nov 1996||3 Feb 1998||Sturino; David P.||Panty liner|
|US5728446 *||23 Oct 1995||17 Mar 1998||Johnston; Raymond P.||Liquid management film for absorbent articles|
|US5797894 *||11 Oct 1994||25 Aug 1998||Johnson & Johnson, Inc.||Unitized sanitary napkin|
|US5817271 *||18 Dec 1996||6 Oct 1998||Congleton; Stephen D.||Altering the surfaces of functional absorbent materials for use in absorbent articles|
|US5826475 *||12 Sep 1997||27 Oct 1998||Kimberly-Clark Worldwide, Inc.||Knife shaft assembly|
|US5833679 *||18 Nov 1996||10 Nov 1998||Uni-Charm Corporation||Absorbent structure of sanitary article|
|US5916678 *||16 Oct 1996||29 Jun 1999||Kimberly-Clark Worldwide, Inc.||Water-degradable multicomponent fibers and nonwovens|
|US5925026 *||10 Mar 1997||20 Jul 1999||Kimberly-Clark Worldwide, Inc.||Apertured absorbent pads for use in absorbent articles|
|US5951537 *||14 Oct 1997||14 Sep 1999||The Procter & Gamble Company||Flexible absorbent article|
|US5961504 *||7 Dec 1993||5 Oct 1999||Kimberly-Clark Worldwide, Inc.||Method for reducing malodor in absorbent products and products formed thereby|
|US5967009 *||6 Feb 1998||19 Oct 1999||Kimberly-Clark Worldwide, Inc.||Rotary knife apparatus and cutting method|
|US5986167 *||24 Mar 1998||16 Nov 1999||Kimberly-Clark Worldwide, Inc.||Method of distributing liquid in apertured absorbent pads|
|US6004893 *||30 Aug 1996||21 Dec 1999||The Procter & Gamble Company||Shaped sanitary napkin with flaps|
|US6031147 *||6 Jun 1995||29 Feb 2000||Kimberly-Clark Worldwide, Inc.||Method for reducing malodor in absorbent products and products formed thereby|
|US6042575 *||26 Jul 1996||28 Mar 2000||The Procter & Gamble Company||Generally thin, flexible, sanitary napkin with central absorbent hump|
|US6055897 *||6 Nov 1997||2 May 2000||Kimberly-Clark Worldwide, Inc.||Die cutting insert for a rotary die cutter and the die itself|
|US6150002 *||18 Mar 1998||21 Nov 2000||Kimberly-Clark Worldwide, Inc.||Creped nonwoven liner with gradient capillary structure|
|US6197404||31 Oct 1997||6 Mar 2001||Kimberly-Clark Worldwide, Inc.||Creped nonwoven materials|
|US6214274||16 Jun 1999||10 Apr 2001||Kimberly-Clark Worldwide, Inc.||Process for compressing a web which contains superabsorbent material|
|US6231555 *||20 Dec 1996||15 May 2001||The Procter & Gamble Company||Absorbent article having improved integrity and acquisition|
|US6250189 *||22 Dec 1999||26 Jun 2001||Kimberly-Clark Worldwide, Inc.||Rotary die cutter|
|US6319342||15 Oct 1999||20 Nov 2001||Kimberly-Clark Worldwide, Inc.||Method of forming meltblown webs containing particles|
|US6323388 *||16 Jun 1999||27 Nov 2001||Kimberly-Clark Worldwide, Inc.||Absorbent article with an improved, wet-formed absorbent|
|US6329565||16 Dec 1999||11 Dec 2001||Kimberly-Clark Worldwide, Inc.||Absorbent structure and method|
|US6380455||28 Dec 1999||30 Apr 2002||Kimberly-Clark Worldwide, Inc.||Feminine sanitary protection package and method|
|US6387084||13 Feb 1996||14 May 2002||Kimberly-Clark Worldwide, Inc.||Sanitary napkin with garment attachment panels|
|US6417120||15 Oct 1999||9 Jul 2002||Kimberly-Clark Worldwide, Inc.||Particle-containing meltblown webs|
|US6460484 *||3 May 2001||8 Oct 2002||Uni-Heartous Corporation||Pet sheet|
|US6468931 *||22 Aug 1996||22 Oct 2002||Fiberweb North America, Inc.||Multilayer thermally bonded nonwoven fabric|
|US6494974||24 Sep 2001||17 Dec 2002||Kimberly-Clark Worldwide, Inc.||Method of forming meltblown webs containing particles|
|US6610381||9 May 1997||26 Aug 2003||Standard Textile Co., Inc.||Absorbent barrier sheet and method of making same|
|US6706945||10 Nov 2000||16 Mar 2004||Kimberly-Clark Worldwide, Inc.||Absorbent article with improved, wet-formed absorbent|
|US6746435||11 Dec 1995||8 Jun 2004||The Procter & Gamble Company||Shaped sanitary napkin with flaps|
|US6893525||1 May 2000||17 May 2005||Fort James Corporation||Method for embossing air-laid webs using laser engraved heated embossing rolls|
|US6902552||4 Apr 2003||7 Jun 2005||Kimberly-Clark Worldwide, Inc.||Curved sanitary napkin with garment attachment panels|
|US6998086||19 Sep 2003||14 Feb 2006||Kimberly-Clark Worldwide, Inc.||Multi-segmented embossing apparatus and method|
|US7048885||14 Aug 2003||23 May 2006||Kimberly-Clark Worldwide, Inc.||Method and apparatus for forming an embossed article|
|US7063689||3 Dec 2001||20 Jun 2006||Kimberly-Clark Worldwide, Inc.||Sanitary napkin with garment attachment panels|
|US7166094||28 May 2002||23 Jan 2007||Tyco Healthcare Retail Services Ag||Multiple layer absorbent article|
|US7192630 *||28 Apr 2003||20 Mar 2007||Flawa Ag||Disk method for producing the same and device for carrying out said method|
|US7195810||21 Apr 2000||27 Mar 2007||Fort James Corporation||Air-laid absorbent sheet with sinuate emboss|
|US7208064||8 Sep 2004||24 Apr 2007||Georgia-Pacific Consumer Products Lp||Method for embossing air-laid webs using laser engraved heated hard rubber embossing rolls|
|US7276053||16 Aug 1999||2 Oct 2007||Johnson & Johnson, Inc.||Compression-resistant sanitary napkin|
|US7278988||20 Sep 2001||9 Oct 2007||Kimberly-Clark Worldwide, Inc.||Dual-use pantiliner|
|US7335810 *||11 Jul 2002||26 Feb 2008||Uni-Charm Corporation||Absorbent article having extended cushion layer with corrugated topsheet|
|US7655105||6 Apr 2007||2 Feb 2010||Georgia-Pacific Consumer Products Lp||Method for embossing air-laid webs using laser engraved heated embossing rolls|
|US7686790 *||4 Mar 2003||30 Mar 2010||Kimberly-Clark Worldwide, Inc.||Nonlinear, undulating perimeter embossing in an absorbent article|
|US7699955||31 Jan 2007||20 Apr 2010||Georgia-Pacific Consumer Products Lp||Air-laid absorbent sheet with sinuate emboss|
|US8211815||13 Jun 2003||3 Jul 2012||Kimberly-Clark Worldwide, Inc.||Absorbent structure having three-dimensional topography on upper and lower surfaces|
|US8231590||28 Dec 2004||31 Jul 2012||Kimberly-Clark Worldwide, Inc.||Visually coordinated absorbent product|
|US8575419 *||4 Apr 2007||5 Nov 2013||The Procter And Gamble Company||Feminine hygiene article with wavy patterns|
|US8617449||24 May 2012||31 Dec 2013||Kimberly-Clark Worldwide, Inc.||Method of making an absorbent structure having three-dimensional topography|
|US8847002||19 May 2011||30 Sep 2014||Kimberly-Clark Worldwide, Inc.||Absorbent article containing apertures arranged in registration with an embossed wave pattern|
|US8932504||7 Oct 2013||13 Jan 2015||Kimberly-Clark Worldwide, Inc.||Method of making absorbent structure having three-dimensional topography|
|US8936584||18 Jul 2012||20 Jan 2015||Kimberly-Clark Worldwide, Inc.||Visually-coordinated absorbent product|
|US8986273||26 Oct 2012||24 Mar 2015||Kimberly-Clark Worldwide, Inc.||Absorbent personal care article having intermeshing flaps|
|US8993832 *||24 Dec 2009||31 Mar 2015||Unicharm Corporation||Absorbent article having compressed grooves|
|US9044356||19 May 2011||2 Jun 2015||Kimberly-Clark Worldwide, Inc.||Absorbent article having enhanced leakage protection|
|US9066837||29 Oct 2010||30 Jun 2015||Kimberly-Clark Worldwide, Inc.||Absorbent article with annular absorbent member|
|US9132048||27 Sep 2011||15 Sep 2015||Sumitomo Seika Chemicals Co., Ltd.||Water-absorbent sheet structure|
|US9173782||28 Mar 2013||3 Nov 2015||Kimberly-Clark Worldwide, Inc.||Coordinated apertured and embossed topsheet layer materials, and absorbent articles containing such|
|US20030018313 *||7 Dec 2001||23 Jan 2003||Tanzer Richard Warren||Absorbent structure and method|
|US20030088222 *||11 Jul 2002||8 May 2003||Uni-Charm Corporation||Absorbent article|
|US20030225383 *||28 May 2002||4 Dec 2003||Glaug Frank S.||Multiple layer absorbent article|
|US20030225385 *||28 May 2002||4 Dec 2003||Glaug Frank S.||Absorbent article with multiple core|
|US20040059310 *||23 Sep 2003||25 Mar 2004||Ivano Gagliardi||Flexible absorbent articles|
|US20040081505 *||18 Sep 2003||29 Apr 2004||Smith Herman Anthony||Printer exit tray and computer printer having an exit tray|
|US20040118534 *||19 Dec 2002||24 Jun 2004||Anderson Ralph Lee||Low formaldehyde creping composition and product and process incorporating same|
|US20040122397 *||19 Dec 2002||24 Jun 2004||Morman Michael T.||Absorbent garment having a trapezoidal shaped retention element|
|US20040176734 *||4 Mar 2003||9 Sep 2004||Rasmussen Shelley R.||Perimeter embossing in an absorbent article|
|US20040236296 *||28 Apr 2003||25 Nov 2004||Chrisoph Ziltener||Disk method for producing the same and device for carrying out said method|
|US20040253892 *||13 Jun 2003||16 Dec 2004||Kimberly-Clark Worldwide, Inc.||Absorbent structure having three-dimensional topography on upper and lower surfaces|
|US20050035492 *||14 Aug 2003||17 Feb 2005||Kimberly-Clark Worldwide, Inc.||Method and apparatus for forming an embossed article|
|US20050039846 *||8 Sep 2004||24 Feb 2005||Schmidt Bradley G.||Method for embossing air-laid webs using laser engraved heated hard rubber embossing rolls|
|US20050064058 *||19 Sep 2003||24 Mar 2005||Kimberly-Clark Worldwide, Inc.||Multi-segmented embossing apparatus and method|
|US20050154365 *||28 Dec 2004||14 Jul 2005||Zander Teresa M.||Visually coordinated absorbent product|
|US20050262617 *||31 May 2005||1 Dec 2005||Andrew Szypka||Absorbent cranial cap|
|US20060004334 *||30 Jun 2004||5 Jan 2006||Kimberly-Clark Worldwide, Inc.||Stabilized absorbent structures|
|US20060025739 *||7 Dec 2004||2 Feb 2006||Dipalma Joseph||Wrapper component for personal care articles having a sensory cue for opening|
|US20070126141 *||31 Jan 2007||7 Jun 2007||Georgia-Pacific Consumer Products Lp||Air-Laid Absorbent Sheet With Sinuate Emboss|
|US20070181243 *||6 Apr 2007||9 Aug 2007||Georgia-Pacific Consumer Products Lp||Method for Embossing Air-Laid Webs Using Laser Engraved Heated Embossing Rolls|
|US20080249495 *||4 Apr 2007||9 Oct 2008||Maurizio Di Virgilio||Feminine hygiene article with wavy patterns|
|US20090112173 *||17 Dec 2007||30 Apr 2009||Kofi Ayensu Bissah||Absorbent article including an absorbent layer having a plurality of spaced beam elements|
|US20100144257 *||5 Dec 2008||10 Jun 2010||Bart Donald Beaumont||Abrasive pad releasably attachable to cleaning devices|
|US20110288514 *||24 Dec 2009||24 Nov 2011||Uni-Charm Corporation||Absorbent article|
|US20120035566 *||11 Sep 2009||9 Feb 2012||Unicharm Corporation||Absorbent article|
|USRE33351 *||22 Nov 1989||25 Sep 1990||Menstrual and incontinence pad|
|CN102378614B||25 Mar 2010||23 Jul 2014||住友精化株式会社||Water-absorbing sheet|
|DE2721816A1 *||11 May 1977||17 Nov 1977||Minnesota Mining & Mfg||Vorlage|
|EP0067916A1 *||16 Sep 1981||29 Dec 1982||JOHNSON & JOHNSON BABY PRODUCTS COMPANY||Quilted diaper and sanitary napkin products|
|EP0104906A1 *||23 Sep 1983||4 Apr 1984||Personal Products Company||Breathable panty liner|
|EP0106473A1 *||1 Sep 1983||25 Apr 1984||Personal Products Company||Embossed panty liner|
|EP0140135A1 *||19 Sep 1984||8 May 1985||Kimberly-Clark Corporation||Sanitary napkin set|
|EP0140560A1 *||14 Sep 1984||8 May 1985||Personal Products Company||Absorbent product with color contrasted cover pattern|
|EP0156257A2 *||14 Mar 1985||2 Oct 1985||Vereinigte Papierwerke AG||Sanitary towel or panty liner|
|EP0229542A1 *||17 Nov 1986||22 Jul 1987||Kaysersberg Sa||Method for making a depression in the surface of an absorbent structure|
|EP0348840A2 *||23 Jun 1989||3 Jan 1990||Kimberly-Clark Corporation||Humidistat|
|EP0366079A2 *||24 Oct 1989||2 May 1990||McNEIL-PPC, INC.||Absorbent structure having multiple canals|
|EP0719122A1 †||8 Sep 1994||3 Jul 1996||Mölnlycke AB||Absorption body|
|EP0796072A1 *||22 Feb 1995||24 Sep 1997||Mölnlycke AB||An absorbent body and apparatus for its manufacture|
|EP1077053A2 *||14 Aug 2000||21 Feb 2001||JOHNSON & JOHNSON INC.||Compression-resistant sanitary napkin|
|EP1905416A1 *||25 Jun 2007||2 Apr 2008||Johnson and Johnson Consumer Companies, Inc.||Skin treatment article|
|EP2415439A1 *||25 Mar 2010||8 Feb 2012||Sumitomo Seika Chemicals CO. LTD.||Water-absorbing sheet|
|EP2623308A1 *||27 Sep 2011||7 Aug 2013||Sumitomo Seika Chemicals Co., Ltd.||Water absorbent sheet structure|
|WO1989001325A1 *||26 Jul 1988||23 Feb 1989||Landstingens Inkopscentral||Absorbent pad and method and apparatus for making the same|
|WO1989010109A1 *||12 Apr 1989||2 Nov 1989||Weyerhaeuser Co||Method of making a pad or other article|
|WO1993011727A1 *||15 Dec 1992||24 Jun 1993||Minnesota Mining & Mfg||Liquid management member for absorbent articles|
|WO1999022619A1 *||26 Oct 1998||14 May 1999||Kimberly Clark Co||Creped nonwoven materials and liner|
|WO2010063118A1 *||4 Dec 2009||10 Jun 2010||Boemar Inc.||Abrasive pad releasably attachable to devices|
|U.S. Classification||604/366, 604/380, 604/368, 604/371, 604/373, 604/387, 604/372|
|International Classification||A61F13/56, A61F13/15|
|Cooperative Classification||A61F2013/51097, A61F2013/4708, A61F2013/582, A61F2013/530802, A61F2013/51186, A61F2013/51409, A61F2013/53908, A61F2013/51355, A61F13/533, A61F13/58, A61F13/539, A61F2013/530131|