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Publication numberUS3881490 A
Publication typeGrant
Publication date6 May 1975
Filing date20 Dec 1973
Priority date20 Dec 1973
Also published asCA1031503A1, DE2460712A1, DE2460712B2
Publication numberUS 3881490 A, US 3881490A, US-A-3881490, US3881490 A, US3881490A
InventorsHoward A Whitehead, Ralph V Braun
Original AssigneeKimberly Clark Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Thin, flexible absorbent pads
US 3881490 A
Abstract
Thin, absorbent pads with soft, flexible edges. The pad structure comprises a fluid pervious non-woven cover sheet, a central absorbent batt of comminuted wood pulp fibers, and a fluid-impervious backing element. Each element is coextensive with the others. The integrity of the central absorbent batt is maintained in the x and y directions by adhering the cover sheet and 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 hydrogen bonding of the wood pulp fibers in selected areas. The selected areas of hydrogen bonding comprise a spaced pattern of embossment lines which extend generally longitudinally of the pad and intersect the edges and ends of the pad at spaced intervals. The pad may be adapted for secure placement on a suitable support such as a snug-fitting undergarment by the use of pressure sensitive adhesive on the backing element or by increasing the frictional properties of the bottom side by the use of flexible foam or other friction increasing materials.
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Description  (OCR text may contain errors)

O United States Patent 1 [111 3,881,490 Whitehead et al. May 6, 1975 THIN, FLEXIBLE ABSORBENT PADS [57] 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 [73] 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 [21] 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 [51] 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.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2788003 *6 Jun 19559 Apr 1957Chicopee Mfg CorpDisposable absorbent pad
US3563243 *19 Jan 196816 Feb 1971Johnson & JohnsonAbsorbent pad
US3595237 *6 Oct 196927 Jul 1971Personal Products CoAdhesive attachment of removable protective liners for nether garments
US3670731 *20 May 196620 Jun 1972Johnson & JohnsonAbsorbent product containing a hydrocolloidal composition
US3693622 *14 Aug 197026 Sep 1972Jones Sr John LWaste fluid flow control element
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4059114 *22 Oct 197622 Nov 1977Minnesota Mining And Manufacturing CompanyGarment shield
US4079739 *27 Dec 197621 Mar 1978Kimberly-Clark CorporationDie-cut contoured catamenial napkin of multi-layered construction
US4145464 *15 Oct 197620 Mar 1979Scott Paper CompanyAbsorbent articles
US4213459 *12 May 197822 Jul 1980Kimberly-Clark CorporationDisposable diaper with localized area of increased density
US4285343 *16 Oct 197925 Aug 1981Mcnair Rosetta MSanitary napkin
US4376440 *5 Aug 198015 Mar 1983Kimberly-Clark CorporationSanitary napkin with adhesive attachment means
US4393521 *6 Apr 198119 Jul 1983Jones Carolyn RDisposable garment shield and method of manufacture
US4397644 *4 Feb 19829 Aug 1983Kimberly-Clark CorporationSanitary napkin with improved comfort
US4518451 *2 Sep 198221 May 1985Personal Products CompanyEmbossed panty liner
US4624666 *20 Jul 198425 Nov 1986Personal Products CompanyChanneled napkin with dry cover
US4650481 *22 Feb 198517 Mar 1987Kimberly-Clark CorporationCrinkled, quilted absorbent pad
US4758241 *18 Jun 198719 Jul 1988Papajohn Elissa DMenstrual and incontinence pad
US4824718 *4 Dec 198725 Apr 1989Minnesota Mining And Manufacturing CompanyPorous film
US4834739 *17 Dec 198730 May 1989Kimberly-Clark CorporationExternal feminine protection device with skid-resistant coating for holding the device in place
US4850991 *10 Sep 198725 Jul 1989Kao CorporationNon-slipping, nonleaking; laminate with hydrophobic polymer; diapers, sanitary napkins
US4882213 *29 Apr 198821 Nov 1989Weyerhaeuser CompanyAbsorbent article with tear line guide
US4885200 *29 Apr 19885 Dec 1989Weyerhaeuser CompanyInfant car seat liner
US4886697 *29 Apr 198812 Dec 1989Weyerhaeuser CompanyThermoplastic material containing absorbent pad or other article
US4891454 *29 Apr 19882 Jan 1990Weyerhaeuser CompanyInfant car seat liner
US4892535 *7 Aug 19879 Jan 1990Landstingens Inkopscentral, Lic, Ekonomisk ForeningAbsorbent pad and method and apparatus for making the same
US4892769 *29 Apr 19889 Jan 1990Weyerhaeuser CompanyFire resistant thermoplastic material containing absorbent article
US4900377 *29 Apr 198813 Feb 1990Weyerhaeuser CompanyMethod of making a limited life pad
US4902553 *18 Nov 198820 Feb 1990Minnesota Mining And Manufacturing CompanyDisposable products
US4950264 *4 Jan 198921 Aug 1990The Procter & Gamble CompanyThin, flexible sanitary napkin
US4961930 *29 Apr 19889 Oct 1990Weyerhaeuser CompanyHeat bonded
US4967758 *8 Dec 19886 Nov 1990Prospect Holdings, Inc.Disposable cover/liner for blood pressure measuring devices
US4997082 *16 May 19895 Mar 1991Kimberly-Clark CorporationHumidistat
US5009653 *20 Aug 199023 Apr 1991The Procter & Gamble CompanyThin, flexible sanitary napkin
US5025504 *16 Dec 198825 Jun 1991Weyerhaeuser CompanyLiner for a helmet, hat, cap or other head covering
US5092860 *7 Dec 19903 Mar 1992Kaysersberg, SaSanitary napkin
US5248309 *20 Mar 199228 Sep 1993Kimberly-Clark CorporationThin sanitary napkin having a central absorbent zone and a method of forming the napkin
US5308673 *7 May 19923 May 1994Minnesota Mining And Manufacturing CompanyCellulosic pulp fibers; stitching yarn of at least two compositionally different fibers having different heat stability; partially melt-bonded at points of contact
US5310590 *4 Feb 199310 May 1994Minnesota Mining And Manufacturing CompanyWiping and scrubbing article with absorbers, fibers multilayer
US5346485 *30 Apr 199313 Sep 1994Kimberly-Clark CorporationPolymeric composition for the absorption of proteinaceous fluids
US5360419 *8 Dec 19891 Nov 1994Kimberly-Clark CorporationAbsorbent structure possessing improved integrity
US5360504 *28 Apr 19931 Nov 1994Kimberly-Clark CorporationMethod of bonding an adhesive to foam
US5368668 *2 Mar 199429 Nov 1994Minnesota Mining And Manufacturing CompanyStitchbonded absorbent articles and method of making same
US5383869 *8 Oct 199224 Jan 1995The Procter & Gamble CompanyThin, flexible sanitary napkin
US5429630 *29 May 19924 Jul 1995Kimberly-Clark CorporationAbsorbent article and a method of removing said article from an undergarment
US5466232 *20 Nov 199214 Nov 1995Johnson & Johnson Inc.Unitized sanitary napkin
US5489283 *1 Dec 19936 Feb 1996The Procter & Gamble CompanyShaped sanitary napkin with flaps
US5514120 *22 Aug 19937 May 1996Minnesota Mining And Manufacturing CompanyLiquid management member for absorbent articles
US5543004 *2 Mar 19946 Aug 1996Minnesota Mining And Manufacturing CompanyStitchbonded articles and method of making same
US5575786 *26 Sep 199419 Nov 1996Osborn, Iii; Thomas W.Thin sanitary napkin
US5609588 *8 Jun 199411 Mar 1997Kimberly-Clark CorporationArticle having a non-absorbent resilient layer
US5635239 *27 Jul 19943 Jun 1997Kimberly-Clark Worldwide, Inc.Absorbent structure possessing improved integrity
US5713886 *1 Nov 19963 Feb 1998Sturino; David P.Panty liner
US5728446 *23 Oct 199517 Mar 1998Johnston; Raymond P.Grooves
US5797894 *11 Oct 199425 Aug 1998Johnson & Johnson, Inc.Unitized sanitary napkin
US5817271 *18 Dec 19966 Oct 1998Congleton; Stephen D.Altering the surfaces of functional absorbent materials for use in absorbent articles
US5826475 *12 Sep 199727 Oct 1998Kimberly-Clark Worldwide, Inc.Knife shaft assembly
US5833679 *18 Nov 199610 Nov 1998Uni-Charm CorporationAbsorbent structure of sanitary article
US5916678 *16 Oct 199629 Jun 1999Kimberly-Clark Worldwide, Inc.Used to form fibrous nonwoven webs which can be used as components in such end-use products as medical and health care related items, wipes and personal care absorbent articles
US5925026 *10 Mar 199720 Jul 1999Kimberly-Clark Worldwide, Inc.Apertured absorbent pads for use in absorbent articles
US5951537 *14 Oct 199714 Sep 1999The Procter & Gamble CompanyFlexible absorbent article
US5961504 *7 Dec 19935 Oct 1999Kimberly-Clark Worldwide, Inc.Method for reducing malodor in absorbent products and products formed thereby
US5967009 *6 Feb 199819 Oct 1999Kimberly-Clark Worldwide, Inc.Rotary knife apparatus and cutting method
US5986167 *24 Mar 199816 Nov 1999Kimberly-Clark Worldwide, Inc.Method of distributing liquid in apertured absorbent pads
US6004893 *30 Aug 199621 Dec 1999The Procter & Gamble CompanyShaped sanitary napkin with flaps
US6031147 *6 Jun 199529 Feb 2000Kimberly-Clark Worldwide, Inc.A disposable absorbent product comprising a surface-active agent to reduce the odor of urine, having a low hydrophilic/lipophilic balance; diapers
US6042575 *26 Jul 199628 Mar 2000The Procter & Gamble CompanyGenerally thin, flexible, sanitary napkin with central absorbent hump
US6055897 *6 Nov 19972 May 2000Kimberly-Clark Worldwide, Inc.Die cutting insert for a rotary die cutter and the die itself
US6150002 *18 Mar 199821 Nov 2000Kimberly-Clark Worldwide, Inc.Creped nonwoven liner with gradient capillary structure
US619740431 Oct 19976 Mar 2001Kimberly-Clark Worldwide, Inc.Creped nonwoven materials
US621427416 Jun 199910 Apr 2001Kimberly-Clark Worldwide, Inc.Process for compressing a web which contains superabsorbent material
US6231555 *20 Dec 199615 May 2001The Procter & Gamble CompanyAbsorbent article having improved integrity and acquisition
US6250189 *22 Dec 199926 Jun 2001Kimberly-Clark Worldwide, Inc.Rotary die cutter
US631934215 Oct 199920 Nov 2001Kimberly-Clark Worldwide, Inc.Method of forming meltblown webs containing particles
US6323388 *16 Jun 199927 Nov 2001Kimberly-Clark Worldwide, Inc.Absorbent article with an improved, wet-formed absorbent
US632956516 Dec 199911 Dec 2001Kimberly-Clark Worldwide, Inc.Absorbent structure and method
US638045528 Dec 199930 Apr 2002Kimberly-Clark Worldwide, Inc.Feminine sanitary protection package and method
US638708413 Feb 199614 May 2002Kimberly-Clark Worldwide, Inc.Sanitary napkin with garment attachment panels
US641712015 Oct 19999 Jul 2002Kimberly-Clark Worldwide, Inc.Particle-containing meltblown webs
US6460484 *3 May 20018 Oct 2002Uni-Heartous CorporationPet sheet
US6468931 *22 Aug 199622 Oct 2002Fiberweb North America, Inc.Multilayer thermally bonded nonwoven fabric
US649497424 Sep 200117 Dec 2002Kimberly-Clark Worldwide, Inc.Method of forming meltblown webs containing particles
US66103819 May 199726 Aug 2003Standard Textile Co., Inc.Absorbent barrier sheet and method of making same
US670694510 Nov 200016 Mar 2004Kimberly-Clark Worldwide, Inc.Absorbent article with improved, wet-formed absorbent
US674643511 Dec 19958 Jun 2004The Procter & Gamble CompanyShaped sanitary napkin with flaps
US68935251 May 200017 May 2005Fort James CorporationMethod for embossing air-laid webs using laser engraved heated embossing rolls
US69025524 Apr 20037 Jun 2005Kimberly-Clark Worldwide, Inc.Curved sanitary napkin with garment attachment panels
US699808619 Sep 200314 Feb 2006Kimberly-Clark Worldwide, Inc.Multi-segmented embossing apparatus and method
US704888514 Aug 200323 May 2006Kimberly-Clark Worldwide, Inc.Method and apparatus for forming an embossed article
US70636893 Dec 200120 Jun 2006Kimberly-Clark Worldwide, Inc.Sanitary napkin with garment attachment panels
US716609428 May 200223 Jan 2007Tyco Healthcare Retail Services AgMultiple layer absorbent article
US7192630 *28 Apr 200320 Mar 2007Flawa AgDisk method for producing the same and device for carrying out said method
US719581021 Apr 200027 Mar 2007Fort James CorporationAir-laid absorbent sheet with sinuate emboss
US72080648 Sep 200424 Apr 2007Georgia-Pacific Consumer Products LpMethod for embossing air-laid webs using laser engraved heated hard rubber embossing rolls
US727605316 Aug 19992 Oct 2007Johnson & Johnson, Inc.Compression-resistant sanitary napkin
US727898820 Sep 20019 Oct 2007Kimberly-Clark Worldwide, Inc.Dual-use pantiliner
US7335810 *11 Jul 200226 Feb 2008Uni-Charm CorporationAbsorbent article having extended cushion layer with corrugated topsheet
US76551056 Apr 20072 Feb 2010Georgia-Pacific Consumer Products LpMethod for embossing air-laid webs using laser engraved heated embossing rolls
US7686790 *4 Mar 200330 Mar 2010Kimberly-Clark Worldwide, Inc.Nonlinear, undulating perimeter embossing in an absorbent article
US769995531 Jan 200720 Apr 2010Georgia-Pacific Consumer Products LpAir-laid absorbent sheet with sinuate emboss
US821181513 Jun 20033 Jul 2012Kimberly-Clark Worldwide, Inc.Absorbent structure having three-dimensional topography on upper and lower surfaces
US823159028 Dec 200431 Jul 2012Kimberly-Clark Worldwide, Inc.Visually coordinated absorbent product
US8575419 *4 Apr 20075 Nov 2013The Procter And Gamble CompanyFeminine hygiene article with wavy patterns
US861744924 May 201231 Dec 2013Kimberly-Clark Worldwide, Inc.Method of making an absorbent structure having three-dimensional topography
US20110288514 *24 Dec 200924 Nov 2011Uni-Charm CorporationAbsorbent article
US20120035566 *11 Sep 20099 Feb 2012Unicharm CorporationAbsorbent article
USRE33351 *22 Nov 198925 Sep 1990 Menstrual and incontinence pad
CN102378614B25 Mar 201023 Jul 2014住友精化株式会社吸水片材
DE2721816A1 *11 May 197717 Nov 1977Minnesota Mining & MfgVorlage
EP0067916A1 *16 Sep 198129 Dec 1982JOHNSON & JOHNSON BABY PRODUCTS COMPANYQuilted diaper and sanitary napkin products
EP0104906A1 *23 Sep 19834 Apr 1984Personal Products CompanyBreathable panty liner
EP0106473A1 *1 Sep 198325 Apr 1984Personal Products CompanyEmbossed panty liner
EP0140135A1 *19 Sep 19848 May 1985Kimberly-Clark CorporationSanitary napkin set
EP0140560A1 *14 Sep 19848 May 1985Personal Products CompanyAbsorbent product with color contrasted cover pattern
EP0156257A2 *14 Mar 19852 Oct 1985Vereinigte Papierwerke AGSanitary towel or panty liner
EP0229542A1 *17 Nov 198622 Jul 1987Kaysersberg SaMethod for making a depression in the surface of an absorbent structure
EP0348840A2 *23 Jun 19893 Jan 1990Kimberly-Clark CorporationHumidistat
EP0366079A2 *24 Oct 19892 May 1990McNEIL-PPC, INC.Absorbent structure having multiple canals
EP0719122A18 Sep 19943 Jul 1996Mölnlycke ABAbsorption body
EP0796072A1 *22 Feb 199524 Sep 1997Mölnlycke ABAn absorbent body and apparatus for its manufacture
EP1077053A2 *14 Aug 200021 Feb 2001JOHNSON & JOHNSON INC.Compression-resistant sanitary napkin
EP1905416A1 *25 Jun 20072 Apr 2008Johnson and Johnson Consumer Companies, Inc.Skin treatment article
EP2415439A1 *25 Mar 20108 Feb 2012Sumitomo Seika Chemicals CO. LTD.Water-absorbing sheet
EP2623308A1 *27 Sep 20117 Aug 2013Sumitomo Seika Chemicals Co., Ltd.Water absorbent sheet structure
WO1989001325A1 *26 Jul 198823 Feb 1989Landstingens InkopscentralAbsorbent pad and method and apparatus for making the same
WO1989010109A1 *12 Apr 19892 Nov 1989Weyerhaeuser CoMethod of making a pad or other article
WO1993011727A1 *15 Dec 199224 Jun 1993Minnesota Mining & MfgLiquid management member for absorbent articles
WO1999022619A1 *26 Oct 199814 May 1999Kimberly Clark CoCreped nonwoven materials and liner
WO2010063118A1 *4 Dec 200910 Jun 2010Boemar Inc.Abrasive pad releasably attachable to devices
Classifications
U.S. Classification604/366, 604/380, 604/368, 604/371, 604/373, 604/387, 604/372
International ClassificationA61F13/56, A61F13/15
Cooperative ClassificationA61F2013/51097, A61F2013/4708, A61F2013/582, A61F2013/530802, A61F2013/51186, A61F2013/51409, A61F2013/53908, A61F2013/51355, A61F13/533, A61F13/58, A61F13/539, A61F2013/530131
European ClassificationA61F13/533