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Publication numberUS3559650 A
Publication typeGrant
Publication dateFeb 2, 1971
Filing dateDec 19, 1967
Priority dateDec 19, 1967
Publication numberUS 3559650 A, US 3559650A, US-A-3559650, US3559650 A, US3559650A
InventorsPhyllis M Larson
Original AssigneePhyllis M Larson
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Flushable moisture-retaining sanitary pad
US 3559650 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

United States Patent I [72] Inventor Phyllis M. Larson 3,171,773 3/1965 Estes et al (128/287) 1412 Julie Ave.. McLean, Va. 2210] 3,407,814 10/1968 George et al. 128/290 PP ,769 FOREIGN PATENTS 2g 1m d FDe c 504,466 7 1954 Canada 128/287 1 562,312 8/1958 Canada 128/296 Primary Examiner-Anton O. Oechsle [S4] FLUSHABLE MOISTURE-RETAINING SANITARY Assistant E i A ld W, Kramer PAD Attorney-Max L. Libman 3 Claims, 10 Drawing Figs.

[52] US. Cl 128/290 [51] Int. Cl A6lf 13/16 T C A disposable Sanitary pad or napkin having a Fleld of Search flush disposable absorbent pad on the upper ide and a flush. 296-287Jmqu1red) disposable backing of paper or similar material, with a thin flexible layer of liquid-retarding material (such as a greasy or [56] References cued waxlike material) between the two, so that liquid from the pad UNITED STATES PATENTS cannot reach the backing to dissolve it, but liquid reaching the 3,444,859 5/ 1969 Kalwaites l28/29OX backing from its exposed side will disintegrate it so that it can 3,489,148 l/ 1970 Duncan et al 128/284 be disposed of by flushing in a toilet, the thin layer being una- Re24,385 10/1957 Flanders 128/290 ble to remain as a film without the support of the backing 2,973,760 3/1961 Dudley 128/290X material, so that it also disintegrates when the backing materi- 3,005,456 10/ l 961 Graham 128/290X a1 disintegrates.

QATERPROOF LAYER 2 msmsnm 2m 3.5591650 QQ QQQQ- :1 7 cost: 2 F 2 v QATERPROOF LAYER FIG. 6.

b INVENTOR Fl 7 3G MATERIAL 2b funwnfl 2b Phyllis M. Larson GREASE-LIKE ATTORNEY FLUSI-IABLE MOISTURE-RETAINING SANITARY PAD The problem of providing a sanitary napkin, incontinency pad, disposable baby diaper. geriatric pad. etc.. which can disposed of by flushing it away in a toilet has been a difficult one because the requirement that the entire pad be thus disposable means that it must be made of materials which will disintegrate in water, yet, in the case of sanitary napkins for menstrual use, for example. the menstrual fluids will also tend to disintegrate any material which can be disintegrated by flushing. This problem is solved, according to the present invention, by providing a pad having a backing covered with a thin film of waterproof material which has no mechanical strength except that provided by the backing on which it is spread, so that moisture coming from the pad side of the backing cannot penetrate to reach the backing, but moisture reaching the backing from the other side, as occurs when it is flushed in a toilet, will disintegrate the backing, and thereby cause the thin waterproof layer to be broken up so that it also will be flushed away. As a further refinement, the upper side of the absorbent pad may be provided with depressed. groovedlike portions which tend to diffuse the flow of menstrual fluid and to direct it toward the thicker portions of the absorbent pad where it can be more readily absorbed.

Sanitary pads made according to the invention are suitable for use with the menstrual panty" described in US. Pat. application Ser. No. 65 l ,760,filed July 7, l967by Phyllis M. Larson, but can be used also with any suitable sanitary napkin belt or girdle, or any situation where conventional sanitary pads are used.

The specific nature of the invention as well as other objects and advantages thereof will clearly appear from a description of a preferred embodiment, as shown in the accompanying drawings, in which:

FIG. I is a top view of a sanitary napkin according to the invention;

FIG. 2 is a view taken on line 2-2 of FIG. 1;

FIG. 3 is a side view of the napkin shown in FIG. 1;

FIG. 4 is a sectional view taken on line 4-4 of FIG. 1;

FIG. 5 is a view showing a modified form of the invention;

FIG. 6 is a view of another modification assembled but not folded;

FIG, 7 is a sectional view taken on line 7-7 of FIG. 6;

FIG. 8 is a sectional view similar to FIG. 6, but in the final folded condition;

FIG. 9 is a sectional view of a different modification; and

FIG. 10 is a final-folded view similar to FIG. 9.

According to the FIGS. in which the invention is exemplified by a sanitary napkin, the napkin consists of a backing sheet 2, made of paper or any similar flush-disposable material which will disintegrate upon contact with swirling water, and an upper absorbent pad 3, also made of flush-disposable material, which may be nonwoven rayon or cotton fibers, crepe paper, wood pulp, or similar material, very lightly compressed to form a self-coherent pad capable of absorbing and retaining a maximum amount of fluid, the individual fibers of the pad being however sufficiently compressed to somewhat retard absorbency, so that the fluid material does not flow too freely through it. Between the pad 3 and the backing sheet 2 there is a thin film 4 of greasy or waxy material forming a waterproof barrier between the pad 3 and the backing 2. This film may be a silicon ointment, Diaparene Perianal cream (Sterling), cold cream, Plastibase (Squibb), etc., which also serves as a bonding agent between the pad 3 and the backing 2, and to some extent serves to hold the two together. To further hold the two elements together, a heavy crimping track is formed as shown at 6 and 7, which may be accomplished by crimping rollers, as is well known, in the assembly line formation of the napkins. This crimping track operation, together with the cutting operation which cuts the pads to the proper size and therefore tends to somewhat compress the edge portions 8 and 9 so that they are much thinner than the body of pad 3, provides edge regions on the pad, which not only tend to hold the pad 3 and backing 2 together (in addition to the waterproof film), but also serve to retard the flow of fluid outwardly away from the central longitudinal axis of the pad. and to retain such fluid in the bulky portion of the pad. The upper and lower edges of the pad are similarly compressed, and this compressed rim around the entire perimeter of the pad tends to not only bind the unit together. but also tends to retain moisture in the central absorbent portion, to prevent it from seeping out along the edges.

The top surface of the absorbent pad 3 is preferably provided over its major area with closely-spaced dents or depressions 10, which tend to diffuse the flow of fluid reaching the top surface of the pad and to spread it over a larger area of the pad, and also to permit such fluid to more readily enter into the main body portion of the pad, while at the same time the depressions are so oriented, as will be apparent from the FIGS., that they tend to direct the flow of such fluids from the.

area where it first reaches the pad in a longitudinal direction generally toward the bulky absorbent portion of the pad. For this reason, several rows of such depressions are provided as shown at 11 at the lower end of the pad oriented oppositely from the depressions 9, so as to direct the flow of fluid toward the central portion of the pad.

The backing sheet 2 may be made of any suitable material such as paper, polyvinyl alcohol film, etc., which has a reasonable wet strength, but is not indissoluble in plain water, water with detergent solution, or any chemical composition usually present in septic tanks or sewerage system. The bonding and waterproof layer 4 may be applied either with a blade or a spray nozzle. or in any known fashion, but must form a complete film over the surface which it covers, to prevent the entrance of water from the pad to the backing strip. The material employed should remain nonhardening for the useful life of the product. and must, of course, be nontoxic to the skin.

The depressions 9 and 1 1 may be omitted in the case where the pad is formed of a relatively coarse-grained material having a somewhat rough or corrugated upper surface, which would tend to produce the same general effect. In this case, of course, the general grain of the material should run in a longitudinal direction so as to increase the amount of fluid which is carried by the pad, mainly by working it away from the place of greatest flow, in the center of the pad. The dents or depressions can readily be formed at the same time that the pad is assembled, by passing the pad under or through rollers which are properly embossed to form the desired configuration, However, the amount of pressure should be greater on the edges, so as to compact the edge portions more firmly than the center portion, for the reasons noted above.

The pad shown in FIG. 1 is suited to be carried in the pocket of a menstrual panty such as shown in the above-referred to patent application, or in any similar garment, a tab space 12 being left at the front of the pad for daintiness in handling a used pad. This can be accomplished by leaving the backing sheet 2 exposed at the tab portion, the absorbent pad 3 being cut away for this purpose.

FIG. 5 shows a slight modification in which two tabs 13 and 14 are provided at the ends of the sanitary napkin for attachment to a carrier such as a belt or any similar device, in lieu of the menstrual panty. If the tab material used is such that crimping alone will not provide sufficient bonding between the pad 3 and the backing strip 2, then spot gluing or other means of attachment may be used, but only to an extent sufficient to prevent slippage of the top pad from the lower base, to keep them together during use and during removal, but to allow each to part from the other when flush ed.

Instead of the backing sheet 2 being made of'paper or other relatively nonabsorbent sheet material, it may he a sheet of absorbent pad material similar to the top sheet 3, but preferably thinner, there being however the same waterproof film 4 between the upper and lower portions to prevent moisture from striking through the lower backing pad; however, if a small amount of moisture does strike through, the second pad would tend to absorb this.

FIGS. 6-8 show another way of making a pad according to the invention. In this case. the backing sheet 2 of HO. 1 is extended as shown at 20 and then folded over the top of-thc pad. to provide a firmer top surface. which is yet sufiiciently porous to readily absorb and spread moisture. and which may also be suitably crimpcd or indented if desired.

FlGS. 9 and 10 show another fonn similar to FIG. 8. but with the waterproof layer on the folded side. Instead of being made from a single sheet as shown in FIGS. 6-10. the top and bottom layers could also be made from two separate sheets similar to the backing sheet material.

The backing sheet 2. 2a or 2b should be uniformly saturable, ie. a drop of moisture at any point will spread until it is uniformly absorbed. Crepe paper with considerable wet strength is preferred. the wet strength being only barely sufficient for removal by careful handling when wet by normal use. It should be noted that the greasy layer helps in this respect, as it tends somewhat to keep the fibers together when the backing sheet is damp. although not in swirling water.

It will be apparent that the embodiments shown are only exemplary and that various modifications can be made in construction and arrangement within the scope of the invention as defined in the appended claims.


l. A flush-disposable sanitary pad composed entirely of flush-disintegrating material comprising: a. an upper layer comprising a flush-disposable mass of highly absorbent material, b. a lower backing sheet of flush-disintegrable material secured to the lower side of said mass. c. a thin. flexible continuously impervious layer of fluid-blocking material, incapable of holding itself together in the swirling water of a flush toilet. secured and supported between said upper layer and said lower backing sheet. said impervious layer extending substantially coextensjvely with the effective area of said pad to block the passage of fluid from said upper layer to said lower sheet.

2. The invention according to claim 1, said impervious layer being a layer of greaselike material supported by said backing sheet. a

3. The invention according to claim 1, said pad being in the form of an elongated strip. the side and end edges of the strip being compressed to be thinner than the center portion so as to retard liquid flow from the center toward the edges and thus tend to retain moisture in the center portion of the pad.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3626899 *Jul 14, 1970Dec 14, 1971Spellman & Zenon Products CorpTraining pads for young dogs
US3626943 *Mar 11, 1970Dec 14, 1971Gurdon S WorcesterSanitary clothing article
US3683917 *Mar 24, 1970Aug 15, 1972John M ComerfordAbsorbent product comprising a fluid impervious barrier of a repellent tissue and a hydrocolloid
US4372311 *Sep 12, 1980Feb 8, 1983Union Carbide CorporationDisposable articles coated with degradable water insoluble polymers
US4655759 *Sep 19, 1985Apr 7, 1987Kimberly-Clark CorporationReduced leakage menstrual pad with built-in fold lines
US4681578 *Mar 8, 1985Jul 21, 1987The Procter & Gamble CompanyPantiliner with ventilation areas
US5009652 *Oct 16, 1987Apr 23, 1991Morgan Cheryle IMedical sponges and wipes with a barrier impermeable to infectious agents
US5108382 *Aug 27, 1991Apr 28, 1992Timbale Corporation NvDisposable containers
US5219342 *Jun 14, 1990Jun 15, 1993Hatch Janell MDisposable diapers
US5509913 *Aug 18, 1995Apr 23, 1996Kimberly-Clark CorporationFlushable compositions
US5843056 *Jun 21, 1996Dec 1, 1998Kimberly-Clark Worldwide, Inc.Absorbent article having a composite breathable backsheet
US5879341 *Mar 29, 1996Mar 9, 1999Kimberly-Clark Worldwide, Inc.Absorbent article having a breathability gradient
US5981012 *Nov 25, 1997Nov 9, 1999Kimberly-Clark Worldwide, Inc.Flushable release liner comprising a release coating on a water-sensitive film
US5985396 *Nov 25, 1997Nov 16, 1999Kimberly-Clark Worldwide, Inc.Flushable release liners and methods of making the same
US6294238Sep 15, 1999Sep 25, 2001Kimberly-Clark CorporationFlushable release liner comprising a release coating on a water-sensitive film
US6296914Sep 15, 1999Oct 2, 2001Kimberly-Clark CorporationFlushable release liners and methods of making the same
US6384297Apr 3, 1999May 7, 2002Kimberly-Clark Worldwide, Inc.Water dispersible pantiliner
US6460484 *May 3, 2001Oct 8, 2002Uni-Heartous CorporationPet sheet
US6503233Oct 2, 1998Jan 7, 2003Kimberly-Clark Worldwide, Inc.Absorbent article having good body fit under dynamic conditions
US6530910Aug 7, 1998Mar 11, 2003Kimberly-Clark Worldwide, Inc.Flushable release film with combination wiper
US6562192Apr 12, 2000May 13, 2003Kimberly-Clark Worldwide, Inc.Absorbent articles with absorbent free-flowing particles and methods for producing the same
US6638603Aug 15, 1997Oct 28, 2003Kimberly-Clark Worldwide, Inc.Screen printed coating on water-sensitive film for water protection
US6659990Feb 16, 1999Dec 9, 2003Kimberly-Clark Worldwide, Inc.Absorbent article having a breathability gradient
US6667424Apr 12, 2000Dec 23, 2003Kimberly-Clark Worldwide, Inc.Absorbent articles with nits and free-flowing particles
US6695827Nov 27, 2002Feb 24, 2004Kimberly-Clark Worldwide, Inc.Absorbent article having good body fit under dynamic conditions
US6913573 *Apr 21, 2003Jul 5, 2005Dominic Anthony ViscomiPositive-pressure rectal incontinence pad
US6921393Feb 22, 2002Jul 26, 2005Kimberly-Clark Worldwide, Inc.Absorbent article for absorbing body fluids
US6936038Feb 22, 2002Aug 30, 2005Kimberly-Clark Worldwide, Inc.Absorbent article having a pair of fringes
US6984225May 15, 2001Jan 10, 2006Hakle-Kimberly Deutschland GmbhAbsorbent article and process for the directed drainage of fluids released in a localized manner
US7265258Sep 12, 2003Sep 4, 2007Kimberly-Clark Worldwide, Inc.Absorbent articles with nits and free-flowing particles
US7429689Sep 15, 2003Sep 30, 2008Kimberly-Clark Worldwide, Inc.Absorbent article with center fill performance
US8176864May 3, 2007May 15, 2012Cupid Foundations, Inc.Undergarments having finished edges and methods therefor
US8215251Aug 4, 2008Jul 10, 2012Cupid Foundations, Inc.Undergarments having finished edges and methods therefor
US8314285 *Mar 1, 2004Nov 20, 2012The Procter And Gamble CompanyPantiliner
US8839728Jul 6, 2012Sep 23, 2014Cupid Foundations, Inc.Undergarments having finished edges and methods therefor
US20030163104 *Feb 22, 2002Aug 28, 2003Kimberly-Clark Worldwide, Inc.Method of securing an abosrbent article to a primary absorbent undergarment
US20030163105 *Feb 22, 2002Aug 28, 2003Kimberly-Clark Worldwide, Inc.Absorbent article having a pair of fringes
US20030163108 *Feb 22, 2002Aug 28, 2003Kimberly-Clark Worldwide, Inc.Absorbent article for absorbing body fluids
US20040054331 *Sep 12, 2003Mar 18, 2004Hamilton Wendy L.Absorbent articles with nits and free-flowing particles
US20040102752 *Sep 15, 2003May 27, 2004Fung-Jou ChenAbsorbent article with center fill performance
US20040143273 *Apr 24, 2003Jul 22, 2004Winitsky Kathleen M.Microdermabrasive exfoliator
US20050192549 *Mar 1, 2004Sep 1, 2005Paolo VeglioPantiliner
US20070204782 *May 3, 2007Sep 6, 2007Cupid Foundations, Inc.Undergarments having finished edges and methods therefor
US20080295227 *Aug 4, 2008Dec 4, 2008Cupid Foundations, Inc.Undergarments having finished edges and methods therefor
US20090069768 *Sep 12, 2007Mar 12, 2009Hunt Brenda ADisposable Undergarment
US20150047571 *Aug 16, 2013Feb 19, 2015Linda MastAbsorbent Pad for Animal Waste
EP0059014A2 *Feb 12, 1982Sep 1, 1982THE PROCTER & GAMBLE COMPANYDisposable absorbent article having an improved liquid containment construction
EP0059014A3 *Feb 12, 1982Oct 6, 1982The Procter & Gamble CompanyDisposable absorbent article having an improved liquid containment construction
EP0688548A1 *Jun 22, 1994Dec 27, 1995THE PROCTER & GAMBLE COMPANYCrimping of a fibrous web to a tissue
WO1988000034A1 *Jun 26, 1987Jan 14, 1988Wolfgang DieteUtility object made at least partially of a thin-wall envelope
U.S. Classification604/364, 604/365, 604/380, 604/381, 604/373
International ClassificationA61F13/15, A61F13/56
Cooperative ClassificationA61F13/539, A61F13/537, A61F2013/530131, A61F13/511, A61F2013/53721, A61F2013/51186, A61F2013/5694, A61F2013/51409, A61F13/64, A61F2013/51355, A61F13/15211, A61F2013/53908
European ClassificationA61F13/511, A61F13/15J2