WO1995016424A1 - Article absorbant comportant une surface adherant au corps - Google Patents
Article absorbant comportant une surface adherant au corps Download PDFInfo
- Publication number
- WO1995016424A1 WO1995016424A1 PCT/US1994/014512 US9414512W WO9516424A1 WO 1995016424 A1 WO1995016424 A1 WO 1995016424A1 US 9414512 W US9414512 W US 9414512W WO 9516424 A1 WO9516424 A1 WO 9516424A1
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- WO
- WIPO (PCT)
- Prior art keywords
- absorbent
- absorbent article
- adhesive
- backsheet
- dynes
- Prior art date
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
- A61F13/47—Sanitary towels, incontinence pads or napkins
- A61F13/472—Sanitary towels, incontinence pads or napkins specially adapted for female use
- A61F13/47236—Sanitary towels, incontinence pads or napkins specially adapted for female use characterised by an unusual contour
- A61F13/47245—Sanitary towels, incontinence pads or napkins specially adapted for female use characterised by an unusual contour with asymmetry around the x or y axis
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
- A61F13/47—Sanitary towels, incontinence pads or napkins
- A61F13/472—Sanitary towels, incontinence pads or napkins specially adapted for female use
- A61F13/47272—Sanitary towels, incontinence pads or napkins specially adapted for female use with a longitudinal raised end, e.g. cup-shaped gluteal groove
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
- A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
- A61F13/512—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its apertures, e.g. perforations
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/531—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad
- A61F13/532—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
- A61F13/537—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
- A61F13/53708—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer the layer having a promotional function on liquid propagation in at least one direction
- A61F13/53713—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer the layer having a promotional function on liquid propagation in at least one direction the layer having a promotional function on liquid propagation in the vertical direction
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
- A61F13/537—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
- A61F13/5376—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterised by the performance of the layer, e.g. acquisition rate, distribution time, transfer time
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/56—Supporting or fastening means
- A61F13/5605—Supporting or fastening means specially adapted for sanitary napkins or the like
- A61F13/5611—Supporting or fastening means specially adapted for sanitary napkins or the like using fastening strips, e.g. adhesive, on the undergarment-facing side
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/56—Supporting or fastening means
- A61F13/66—Garments, holders or supports not integral with absorbent pads
- A61F13/82—Garments, holders or supports not integral with absorbent pads with means for attaching to the body
Definitions
- This invention generally relates to disposable absorbent articles, and particularly to absorbent articles adapted to be self supporting and secured to the wearer. More particularly, this invention relates to sanitary napkins for personal feminine hygiene that may be secured to the wearer's body.
- sanitary napkins for the purposes described herein includes thin devices denoted as panty liners and interiabial pads, have been developed for external use about the pudendal region of a female while tampons have been developed for internal use within the vaginal cavity for interruption of menstrual flow therefrom.
- panty liners and interiabial pads thin devices denoted as panty liners and interiabial pads, have been developed for external use about the pudendal region of a female while tampons have been developed for internal use within the vaginal cavity for interruption of menstrual flow therefrom.
- panty liners and interiabial pads have been developed for external use about the pudendal region of a female
- tampons have been developed for internal use within the vaginal cavity for interruption of menstrual flow therefrom.
- a tampon is constructed of natural absorbent material such as cotton, synthetic materials, such as polyethylene or rayon or combinations thereof.
- the tampon is hidden and does not disclose the fact that the wearer is menstruating, it is stylistically preferable to the sanitary napkin.
- its use is interdicted in a number of situations: in some women use of a tampon is physically uncomfortable; its use is not acceptable immediately after childbirth or during post-surgical periods, or when pathological conditions exist; and lastly when menstrual flow is very heavy, the tampon may have insufficient capacity to absorb secretions making the sanitary napkin necessary to supplement or supplant the tampon.
- an important objective is to control the absorption and flow of exudate or body fluids in a manner which obtains maximum utilization of the available absorbent.
- a sanitary napkin is expected to immediately accept all body fluid discharged, rapidly transport the fluid away from the point of discharge, contain the transported fluid within the marginal confines of the napkin, and maintain the body contacting surface as dry as possible.
- the prior art describes many sanitary napkins that have addressed one or more of the above expectations. Improvements to the sanitary napkin's absorbency have included, among other things, the addition of superabsorbents into the absorbent batt and various methods to improve body contact. In the latter, at least three general designs exist.
- One design includes forming the napkin into a cup or boat shape which is intended to catch the menses as it exits the vaginal orifice.
- a second design includes those sanitary napkins that are raised upwardly or humped in their medial portions so as to be near or in contact with the pudendal region when worn. These sanitary napkins attempt to contact and absorb menses immediately as it leaves the vestibule. Such humps or raised areas have been formed from additional medial absorbent or the incorporation of a flexure-resistant deformation element.
- the third design include those sanitary napkins that are not predisposed to have a trough or a hump shape when worn, but instead have a more or less rope-like shape when worn.
- Such sanitary napkins typically have a fluff pulp absorbent core surrounded by flexible outer wraps.
- Securement of the sanitary napkin during use is generally accomplished by attaching the sanitary napkin to the wearer's undergarment by a pressure sensitive adhesive.
- the prior art also teaches the use of wings and flaps which fold over the edges of the elastic sides of the crotch portion of an undergarment and which may then be secured underneath using an adhesive.
- the prior art further teaches using panels with mechanical fasteners.
- this invention relates to a disposable absorbent article having a total weight greater than about 5 grams and adapted to be secured to the torso about the pudendal region of a human.
- the absorbent article includes an absorbent and a body side adhesive secured to the absorbent.
- the absorbent materials are designed to absorb body exudates, including menstrual fluids, cata enial fluids, blood and urine.
- the body side adhesives used in the invention are of the type that exhibit suitable adhesion properties to skin but which can be removed without appreciable discomfort.
- the purpose of the adhesive is to secure the absorbent proximate the wearer, improving body to article contact.
- the adhesives typically have a peel force of from about 25 to about 700 grams. Because of the absorbent articles intimate contact with the wearer, it is also advantageous for the absorbent's surface distal the wearer to be liquid-impermeable. Liquid impermeability can be accomplished by means well known in the art, and include securing a thin polyethylene backsheet to the absorbent or coating the absorbent fibers with a hydrophobic material.
- the general object of the present invention is to provide an absorbent article, such as a sanitary napkin, disposable diaper, incontinent pad, and the like, that is adhesively secured to the wearer's body.
- Another object of this invention is to provide a thin and flexible absorbent article which will, by the mere act of putting it on, will closely conform to and fit the external body surfaces.
- Still another object of this invention is to provide an absorbent article which obviates the need for a frictional supporting means, resulting in a more comfortable body conforming absorbent article.
- Figure 1 is a perspective view of an absorbent article having a body adhesive located about its periphery and having a body side, removable member partially pulled back.
- Figure 2 is a perspective view of another embodiment of an absorbent article showing a longitudinally and transversely centered aperture through the topsheet and absorbent.
- Figure 3 is a cross-sectional view of Figure 2 taken along line 3--3.
- Figure 4 is a top view of another embodiment of an absorbent article having an upper surface which is at least partially overlaid by a backsheet.
- Figure 5 is a cross-sectional view of Figure 4 taken along line 5--5 showing the adhesive partially residing on the topsheet and the backsheet.
- Figure 6 is an alternative cross-sectional view of an alternative embodiment of Fig. 5 taken along line 5--5 showing the backsheet extending over the absorbent's periphery and the adhesive residing completely on the backsheet.
- Figure 7 is a top view of another embodiment showing an aperture in the topsheet and having a flattened front portion and a rearward portion having a ridge or peak.
- Figure 8 is a side view of Figure 8 illustrating the flattened front portion and the peaked rearward portion.
- the body adhesive is shown around the periphery of the absorbent.
- the present invention relates generally to disposable absorbent articles having a total weight greater than about 5 grams that are secured to the body of a user by a pressure sensitive body adhesive.
- a catamenial device i.e. a sanitary napkin
- the invention may be adapted for use in other absorbent articles such as diapers, incontinent devices and the like.
- the same numeral designates the same part in the different views and embodiments.
- the sanitary napkin 10 includes an absorbent 12 and a body side adhesive 14 disposed toward the wearer's body and secured to the absorbent 12.
- the adhesive 14 secures the sanitary napkin 10 to the wearer's body.
- sanitary napkin refers to an article which is worn by females adjacent to the pudendal region and which is intended to absorb and contain various exudates which are discharged from the body such as blood, menses, and urine, and which is intended to be discarded after a single use. Interiabial devices which reside partially within and partially external of the female wearer's vestibule are also within the scope of this invention.
- the sanitary napkin 10 preferably has a total weight of less than about 12 grams.
- the sanitary napkin 10 an oval shape, but it can be an hourglass, racetrack or any other design that will allow the absorbent article to come into intimate contact with the wearer.
- the sanitary napkin 10 has a body side surface 15 which can include a liquid-permeable topsheet 16 proximate the wearer's body; a liquid-impermeable backsheet or baffle 18 that is distal the wearer's body; an absorbent 12 positioned intermediate the topsheet 16 and the backsheet 18; and a pressure sensitive, body side adhesive 14 secured to the body side surface 15.
- the adhesive 14 secures the sanitary napkin 10 to the wearer's body.
- the sanitary napkin 10 is provided with a removable member 20 that is a releasably secured material for protecting the adhesive 14 from contamination and which advantageously protects the topsheet 16 from preplacement soiling until the member 20 is removed and the sanitary napkin 10 is appropriately positioned for use.
- the sanitary napkin 10' illustrates the topsheet 16 and the backsheet 18 having generally a length and a width dimension sized larger than the absorbent 12 so that they extend beyond the outer perimeter 22 of the absorbent 12 to form a peripheral edge 24.
- the backsheet 18 is coextensive and in face to face contact with the topsheet 16, and includes a surface 26 facing toward and disposed under the absorbent 12.
- the topsheet 16 and the backsheet 18 are sealed together from the absorbent perimeter 22 to the peripheral edge 24 in any suitable manner that does not leave a hard, uncomfortable residue that would be annoying to the wearer.
- the term "sealed” encompasses configurations whereby a first member is directly joined to a second member and configurations whereby a first member is indirectly joined to a second member by affixing the first member to intermediate members which in turn are affixed to the second member.
- Means of attachment are well known to those skilled in the art and include the use of hot melt adhesives in a uniform and continuous layer, patterned adhesives, pressure sensitive adhesives, double sided tape, sonic bonding, and heat sealing.
- the absorbent 12 has a first surface 28 and a second surface 30.
- the first surface 28 is disposed toward the topsheet 16 and the second surface 30 is disposed toward the backsheet 18.
- the absorbent article can include a wicking layer 32.
- the wicking layer 32 is positioned adjacent to the second surface 30. The purpose of the wicking layer 32 is to route body fluid which contacts the topsheet 16 down to the absorbent 12.
- the wicking layer 32 may include more than one material having wicking characteristics.
- the first and second surfaces 28 and 30 respectively, of the absorbent 12 have a coaxial ly aligned aperture 34 formed therethrough.
- the aperture 34 can extend through the topsheet 16 so that body fluid will not have to permeate through the topsheet 16 before contacting the absorbent 12.
- the aperture 34 extends through the wicking layer 32. This arrangement allows the aperture 34 to act as a conduit to rapidly transport any sudden gush of body fluid away from the point of discharge to the absorbent's second surface 30, which is positioned on the bottom of the absorbent 12.
- This arrangement also allows the topsheet 16, the absorbent 12, and the backsheet 18 to act as a reservoir to surround and contain the discharged body fluid until it is absorbed by the absorbent 12.
- the backsheet 18 can have between about 5% to about 95% of its surface 26 bonded to the adjacent layer 32. Most preferably, the backsheet 18 is marginally secured to the adjacent layer 32.
- the body adhesive 14 is positioned inward from the peripheral edge 24 of the sanitary napkin 10 and 10'.
- the purpose of the adhesive 14 is to secure the sanitary napkin 10 and 10' to the body of the wearer.
- the adhesive 14 is disposed adjacent to the topsheet 16, overlying the perimeter 22 but can be secured up to about 3 centimeters from the perimeter 22 of the absorbent 12.
- the adhesive 14 is depicted as a continuous, uniform layer, it is to be understood that those skilled in the art can readily select a different pattern for adhesive attachment. For example, an intermittent pattern of adhesive 14 may be applied.
- the adhesive 14 is superimposed over less than about 85% of the body side surface 15 of the sanitary napkin 10, more preferably less than about 50%, and most preferably less than about 25%.
- the adhesive 14 is usually covered, prior to the time sanitary napkin 10 is affixed to the person, with a removable member 20.
- the removable member 20 serves to protect the adhesive 14 from adhering to extraneous surfaces prior to use and to prevent contamination of the adhesive 14.
- the member 20 also prevents the topsheet 16 from becoming prematurely soiled prior to placement against the wearer's body.
- Suitable cover materials can be any material that is capable of being releasably secured to the adhesive 14 and includes those materials commonly used to protect the garment attachment adhesive presently used on commercially sold sanitary napkins. Non-limiting examples include a silicone coated Kraft paper, SIL0X El-0 and BL30MG-A SIL0X 4P/0 manufactured by Akrosil Corporation.
- the liquid-permeable topsheet 16 is designed to contact the body of the wearer and can be constructed of a woven or nonwoven, natural or synthetic material which is easily penetrated by body fluid. Suitable materials include bonded carded webs of polyester, polypropylene, polyethylene, nylon, or other heat-bondable fibers. Other polyolefins, such as copolymers of polypropylene and polyethylene, linear low-density polyethylene, finely-perforated film webs and net material, also work well. Particularly preferred are composite materials of a polymer and a nonwoven fabric material. The composite sheets are generally formed by extrusion of the polymer onto a web of spunbonded material to form an integral sheet.
- topsheet 16 is a spunbond web of polypropylene.
- the web can contain about 1% to about 6% titanium dioxide pigment to give it a clean, white appearance.
- a uniform spunbond material is desirable, because it has sufficient strength, after being perforated in the longitudinal direction, to resist being torn or pulled apart during use.
- the most preferred polypropylene webs have a weight of between about 18 and 40 grams per square meter. An optimum weight is between about 30 and about 40 grams per square meter.
- the topsheet 16 can also be treated with a surfactant to improve its hydrophilic characteristics and, thereby, aid in the absorption of the liquid.
- the surfactant can include topical additions or internally applied materials like polysiloxanes.
- the backsheet 18 can permit the passage of air or vapor out of the sanitary napkin 10 while blocking the passage of body fluids and liquids from the absorbent 12.
- a good material is a micro-embossed, polymeric film, such as polyethylene or polypropylene. Bi -component films can also be used as well as woven and nonwoven fabrics which have been treated to render them liquid-impermeable.
- the backsheet 18 can be made from a polyethylene film.
- the backsheet 18 comprises a polyethylene film having a thickness in the range of from about 0.012 mm to about 1.0 mm.
- the backsheet 18 should be soft and compliant.
- the term "compliant" refers to materials which will readily conform to the general external shape and contours of the human anatomy.
- the backsheet 18, besides being secured to the topsheet 16 as described above, can have from about 5% to about 95% of the surface 26 positioned underneath the absorbent 12 secured to the adjacent layer 32.
- less than about 50% of the surface 26 is secured, and more preferably, less than about 20%.
- the surface 26 is only marginally secured to the adjacent layer 32. This arrangement allows the backsheet 18 to separate, distending downward, from the absorbent 12, thereby acting similar to a fluid reservoir for holding sudden rushes of body fluid.
- the topsheet 16 and the backsheet 18 will, in combination, enclose the absorbent 12, substantially defining the absorbent's perimeter 22.
- the absorbent materials used in the absorbent article 10 are designed to absorb body exudates, including menstrual fluids, catamenial fluids, blood and urine. Suitable materials include wood pulp fluff, rayon, cotton and meltblown polymer, such as polyester, polypropylene or coform. Coform is an air-formed combination of meltblown polymers, such as polypropylene, and absorbent staple fibers, such as cellulose.
- a preferred material is wood fluff, for it is low in cost, relatively easy to form and has good absorbency.
- the absorbent 12 may be a composite comprised of a hydrophilic material that can be formed from various natural or synthetic fibers, wood pulp fibers, regenerated cellulose or cotton fibers, an airlaid tissue or a blend of pulp and other fibers.
- the absorbent 12 can be made from other well known materials used in absorbent articles, including multiple layers of cellulose wadding, rayon fibers, cellulose sponge, hydrophilic synthetic sponge, such as polyurethane, and the like.
- the absorbent 12 can have varying densities in the Z direction.
- the term "Z direction" as used herein means in the direction of the sanitary napkin thickness, where X and Y directions would be along the length (longitudinally) and width (transversely) of the sanitary napkin 10, respectively, see Figure 2.
- the first surface 28 of the absorbent 12 is of a lower density than the second surface 30. This assists in drawing any body fluid toward the backsheet 18 and in reducing and/or preventing the fluid from permeating back toward the wearer a phenomenon known as "rewet.”
- the sanitary napkin 10 is described as having a single layer of absorbent material forming the absorbent 12, the absorbent 12 may include more than one layer of absorbent material. As viewed looking downward from the topsheet 16 toward the backsheet 18, each successive absorbent layer, if used, preferably has a density and a liquid absorption capacity greater than the preceding absorbent layer. It should be emphasized that the values relating to absorbency are relative for any particular style of absorbent article. It is, therefore, quite possible that one particular style of absorbent article may utilize the same material in its second absorbent layer as that utilized as the first absorbent layer in another absorbent article.
- the absorbent 12 may contain superabsorbent particles which are extremely effective in retaining body fluids.
- Superabsorbents have the ability to absorb a large amount of fluid in relation to their own weight.
- Typical superabsorbents used in absorbent articles, such as sanitary napkins, can absorb anywhere from about 5 to about 60 times their weight in body fluids.
- the absorption mechanism of the superabsorbents is usually slower than the rate of fluid absorption by cellulose fluff material.
- superabsorbents have a high mechanical stability in the swollen state, an ability to rapidly absorb fluid, and those having a strong liquid-binding capacity perform well in catamenial devices. Hydroxyfunctional polymers have been found to be good superabsorbents for this application.
- the superabsorbent can be a hydrogel forming polymer composition which is water-insoluble, slightly cross-linked, and partially neutralized. Such superabsorbents can be obtained from Dow Chemical, Hoechst-Celanese, and Stockhausen, Inc.
- the sanitary napkin 10 and 10' can include a wicking layer 32.
- the wicking layer 32 is positioned adjacent to the second surface 30 of the absorbent 12.
- the wicking layer 32 performs the function of distributing the body fluid to and across the second surface 30 of the absorbent 12.
- any material having sufficient capillary activity, or other means to attract and transport body fluid coming into intimate contact with its surface, and thereby distributing the discharges across the whole of the absorbent 12, can be used.
- the wicking layer 32 can be comprised of a fibrous material having little absorption ability. Suitable materials include blends of polyester and rayon that have minimum fluid retaining character. Other materials may be airfor ed or carded webs of polyester, rayon, or polypropylene.
- a preferred material for the wicking layer 32 is a meltblown polypropylene layer having a thickness of about 0.6 mm, a weight of about 60 grams per square meter, a pore size of about 10.6 micrometers, and a mean fiber diameter of about 3.9 micrometers.
- the wicking layer 32 can be coextensive with the second surface 30 of the absorbent 12. Preferably it is of a size less than that of the absorbent 12, thereby having a peripheral edge 36 located inboard from the outer perimeter 22 of the absorbent 12.
- the wicking layer 32 can range from about 10 mm to about 65 mm in width and from about 5 mm to about 180 mm in length.
- the wicking layer 32 can have a wicking rate equal to the wicking rate of the second surface 30 of the absorbent 12 to facilitate liquid transport.
- the wicking layer 32 has a wicking rate greater than that of the second surface 30. Wicking rates may be determined in accordance with the procedure set forth in U.S. Pat. No. 4,256,111, issued to Lassen on March 17, 1981, and which is incorporated by reference and made a part hereof.
- the sanitary napkins 10 and 10' are provided with similar body side adhesive 14 for retaining the sanitary napkin 10 and 10' against the wearer's vulvar region so only 10' will be described in detail.
- the body facing surface 15 is coated with the body side adhesive 14.
- the adhesive 14 is generally disposed within a distance of about 3 centimeters (cm) from the perimeter 22 of the absorbent 12, including the outer perimeter 22 thereof.
- the adhesive 14 may be applied as a continuous or intermittent pattern.
- the thickness and surface area of the adhesive 14 may also vary.
- the adhesive 14 should be superimposed over less than about 85% of the body facing surface 15 of the sanitary napkin 10', preferably less than about 50%, and most preferably, less than about 25%.
- Nonlimiting factors which effect the adhesion of the sanitary napkin 10' to a wearer include: the strength of the adhesive 14; the location of the adhesive 14 on the sanitary napkin 10'; whether the adhesive 14 will lie on the wearer's skin or will primarily be intermingled with body hair; and the size, weight, and shape of the sanitary napkin 10'. Accordingly, adhesives for use in this invention should have an adequate adhesive force to retain the sanitary napkin 10' against the wearer during static and dynamic conditions but will release from the skin and hair without a high level of discomfort. In a preferred embodiment, the sanitary napkin 10' has a total weight ranging from between about 5 grams and less than about 12 grams.
- total weight means the weight of the sanitary napkin 10' without the removable member 20 and before it has acquired any fluids in use.
- suitable adhesives for use have an adhesive peel force, as determined by a modified Pressure Sensitive Tape Council peel resistance test (PSTC-1) described below, of from about 25 grams to about 700 grams.
- PSTC-1 is a standardized test procedure that is described in greater detail on page 23 of the tenth edition of Test Methods copyright 1992, available from Pressure Sensitive Tape Council 401 North Michigan Ave., Chicago, 111. 60611-4267.
- suitable adhesives have the rheological properties loss modulus (G"), storage modulus (G * ) and loss tangent (tan ⁇ s) falling within the ranges of Table 1 below.
- the terms "loss tangent” (tan _ or G"/G”) and “storage modulus” (G'), are defined according to established principles of dynamic mechanics. These rheological quantities are measured on bulk adhesive samples not suspended on any substrate and having a thickness of approximately 0.56 mm. The adhesive is cut into a 25 centimeter (cm) circle and placed between two 25 cm parallel plate fixtures of a Rheometrics Dynamic Spectrometer (RDS), which can be obtained from Rheometrics located at 1 Possum Town Road, Piscataway, New Jersey 08854.
- RDS Rheometrics Dynamic Spectrometer
- the upper platen is lowered onto the sample until the normal force meter indicates a slight deflection.
- the samples are allowed to equilibrate at the test temperature (e.g. 25"C. and 37 ⁇ C.) before testing.
- a minicomputer governs the application of a 5% peak-to-peak shear strain to the sample.
- the frequency of the application can be controlled to a fraction of a radian/sec (one radian is equal to 6.28 Hz).
- the values of the complex modules (G*) and loss tangent (tan -) are calculated by the computer from geometry factors, peak- to-peak amplitude of the torque signal, and phase lag of the torque output wave.
- loss tangent (tan s ) and the relationship between G*, G', and G" provide two equations in two unknowns which can be solved by the computer to provide G" and G', since G* and loss tangent (tan s) are both known values calculated as described previously. For any of these values, the frequency is 10 radian/sec.
- Nonlimiting examples of suitable adhesives include a pressure-sensitive, hydrophilic hydrogel adhesive material.
- Such hydrogel adhesives are marketed by Pro eon Division of Medtronic, Inc., of Minneapolis, Minnesota, under the trademark "PROMEON” and include a commercial medical grade hydrogel marketed as PROMEON RG-63B.
- PROMEON a commercial medical grade hydrogel marketed as PROMEON RG-63B.
- a detailed description of such a hydrogel composition is contained in U.S. Pat. No. 4,593,053, issued to Jevne et al . , on June 3, 1986.
- Another suitable hydrogel adhesive is described in U.S. Pat. No. 4,699,146, issued to Sieverding on October 13, 1987. The disclosures of each of these patents are incorporated by reference and made a part hereof.
- the peel force of the adhesive is determined by a test which is modeled after the PSTC-1 90 * PEEL ADHESION PROCEDURE, the procedure being modified and performed as follows.
- the PEEL ADHESION PROCEDURE gives a force value related to a unidirectional removal force from a test subject's forearm.
- the apparatus used for the Peel Adhesion Procedure is an Instron model 4201 materials testing instrument or equivalent.
- Instron materials testing instrument is available from Instron Engineering Corporation, Canton Massachusetts.
- test specimens are prepared.
- the test specimens are approximately 0.635 cm (1/4 inch) wide with a degree of variance no greater than 0.04 cm (1/64 of an inch).
- the test specimens are approximately 15.24 cm (6 inches) in length.
- a non-hydrogel adhesive In the case where a non-hydrogel adhesive is to be tested, it is conditioned by placing the adhesive laminate strips in a 73 2 degree Fahrenheit and a relative humidity of 50 ⁇ 2 percent for 24 hours. The adhesive strips do not have the peel strip removed.
- the adhesive is a hydrogel
- it is tested at a residual moisture content of 25 percent, 35 percent, and 45 percent.
- all of the samples are conditioned to achieve the proper moisture content.
- Samples having a 25 percent moisture content are prepared by placing the hydrogel having a thickness of 15 ⁇ 1 millimeters on a nonwoven substrate. These laminates are placed in a 130 ⁇ 2 degree Fahrenheit oven with the adhesives exposed. After 45 minutes, the release liner is replaced on the samples and then they are sealed in a polyethylene bag.
- Samples having a 35 percent moisture content are prepared by placing the adhesive laminates of hydrogel having a thickness of 15 ⁇ 1 millimeter on a nonwoven substrate. The laminates are then placed in a chamber having a temperature of 73 + 2 degrees Fahrenheit and a relative humidity of 50 + 2 percent for 6 hours. The samples are removed and the release liner is replaced on the samples and then they are sealed in a polyethylene bag.
- Samples having 45 percent hydration are prepared by placing the adhesive laminates of hydrogel having a thickness of 15 + 1 millimeter on a nonwoven substrate. The laminates are placed in a chamber having a temperature of 100 ⁇ degrees fahrenheit and relative humidity of 80 ⁇ 2 percent for 6 hours. The samples are removed and the release liner is replaced on the samples and then they are sealed in a polyethylene bag.
- the percent hydration is determined by evaporating the moisture from the adhesive laminate at 234 degrees Fahrenheit for eight (8) to twelve (12) hours. Hydration is determined by weight differences, that is, the weight of the nonwoven substrate is subtracted off the sample weights, then the weight of the sample having the moisture evaporated is divided by the original weight of the hydrogel adhesive.
- PEEL ADHESION PROCEDURE The procedure for PEEL ADHESION PROCEDURE is as follows: The specimens are tested in a room having a temperature of 73 _ 3 degrees Fahrenheit and a relative humidity of 50 * 2 percent. Because the adhesive is for attaching an absorbent article onto the body of a wearer, adhesion is tested on human arms. Attach one end of the 15.24 cm specimen to the forearm and drape the specimen along the length of the arm. Roll the test specimen lengthwise, once in each direction, using a 2.043 kilogram (4.5 pound) roller, at a speed of approximately 0.3048 meters per minute (twelve (12) inches per minute).
- the rheological data for an adhesive that is considered to be too aggressive for use but which can be used as a bandage adhesive is "DURO-TAK ⁇ 9908" from National Starch and Chemical Company, 10 Finderne Avenue, P 0 Box 6500, Bridgewater, New Jersey 08807-3300.
- the test specimen was prepared according to the above procedure for determining rheological data. The results appear in TABLE 2 below.
- EXAMPLE 2 In accordance with the above procedures, a number of peel strength test specimens were run using PROMEON hydrogel RG 63B as the adhesive. The results appear in TABLE 3. Rheological data for the hydrogel appears in TABLE 4. All values are in 10 4 dynes/cm 2 and a frequency of 10 radians/second.
- the sanitary napkin 10 has a body facing surface 15, a backsheet 18, an absorbent 12, and a wicking layer 22.
- the absorbent 12 is advantageously provided with an aperture 34 extending through first and second surfaces, 28 and 30 respectively of the absorbent 12.
- the body facing surface 15 of the sanitary napkin 10" includes the liquid-permeable topsheet 16 and a portion of the backsheet 18.
- the aperture 34 can be a variety of geometric configurations.
- the aperture 34 is coaxially aligned and extends through the topsheet 16 and more preferably extends through the wicking layer 32.
- the aperture can be substantially symmetrical in its shape and can be positioned along the longitudinal axis X--X.
- the aperture 34 is longitudinally and transversely centered along the X--X and Y--Y axes, see Figure 4.
- the aperture 34 allows the sanitary napkin 10" to more completely acquire the sometimes highly viscous menses by allowing the backsheet 18 to accumulate the excess menses away from the topsheet 16 and proximate the second surface 30 of the absorbent 12. Without the aperture 34, less absorption of exudates may take place and the unabsorbed exudates may lay in contact with the body and cause irritation or may overflow the peripheral edge 24 of the sanitary napkin 10" and cause soiling.
- the aperture 34 preferably has an area great enough to be in contact with the menses as it exits the wearer's vagina yet not so large as to contact surrounding skin surfaces which could be soiled or irritated by rewet.
- the aperture 34 should be positioned on the body so that menses will contact the aperture 34 before contacting the rest of the topsheet 16.
- the aperture 34 ranges in size from about 10 mm to about 65 mm. If elliptical or of a similar shape having unequal dimensions, the aperture 34 may have a minor axis of from about 10 mm to about 35 mm and a major axis of from about 15 mm to about 85 mm and appropriately positioned on the sanitary napkin 10.
- FIG. 5 a cross-sectional view of Figure 4 along transverse axis Y--Y is shown.
- the backsheet 18 partially overwraps the topsheet 16.
- the backsheet 18 can extend over the topsheet 16, inward from the outer peripheral edge 24 of the sanitary napkin 10", by a distance from about 0.1 mm to about 30 mm.
- Figure 6 shows a cross-sectional view taken along axis Y--Y of another embodiment of the sanitary napkin 10", as illustrated in Figure 4.
- the difference between the embodiments illustrated in Figures 5 and 6 is that in Figure 6 the backsheet 18 extends over the topsheet 16 by a sufficient distance to allow the adhesive 14 to reside on the backsheet 18 which is proximate the wearer.
- the backsheet 18 can extend over the topsheet 16 sufficiently to allow the adhesive 14 to be completely affixed to the backsheet 18 facing the wearer's torso and inward from the perimeter 22.
- the backsheet 18 may be affixed to the topsheet 16 by means well known to those skilled in the art such as spaced apart strips of construction adhesive.
- the sanitary napkin 100 has the same plan form as sanitary napkin 10', illustrated in Figure 2 but with the following difference.
- the sanitary napkin 100 has a rearward portion 38 and a front portion 40.
- the rearward portion 38 includes a raised peak 42.
- the peak 42 forms a gradual rise from its beginning area immediate the aperture 34 to an end section 44 of the sanitary napkin 100.
- the raised peak 42 assists the wearer in properly placing the sanitary napkin 100 between her legs at the perineum and between her buttocks.
- the front portion 40 is generally flat as is best shown in Figure 8.
- the raised peak 42 may be formed completely prior to delivery of the sanitary napkin to the consumer.
- the raised peak 42 may only be present in a precursor state that allows the user to form the peak 42 in its correct shape by folding the sanitary napkin 100 in the preferential fold that the precursor allows. This assists the user in forming the profile of the pad.
- the raised peak 42 may be formed in may ways, including heat setting, thermoplastic containing absorbents, thermoplastic backing members, and scoring the components comprising the sanitary napkin 100 so that the raised peak 42 is formed when in use. Other approaches will occur to the skilled artisan for achieving the goal of providing the peak 42 fold line.
- the length and height of the ridge or raised peak 42 in the rearward portion 38 of the sanitary napkin 100 is determined by the sharpness of the fold and the arrangement of the absorbent 12.
- the fold is useful for aligning the sanitary napkin 100 so that the aperture 34 is correctly aligned under the vestibule, and preferably under the vaginal opening, as the sanitary napkin 100 is being positioned on the body of the user.
- the flattened portion 40 would be concave and extend generally over the mons pubis of the female anatomy and the forward portion of the labia.
- the raised peak 42 generally begins in the pudendal cleft rearward portion of the labia, adjacent the vestibule and extends toward the perineum and buttocks.
- the removable member 20 is first removed, exposing the body adhesive 14 upward and toward the user.
- the aperture 34 can be used to assist the wearer in positioning the sanitary napkin 10' so that the aperture 34 is underneath the vaginal opening.
- the sanitary napkin 10' is then placed adjacent to the wearer by applying a sufficient pressure on the backsheet 18 of the sanitary napkin 10' toward the wearer's body, to secure the napkin 10' to the wearer.
- the sanitary napkins 10, 10', 10" and 100 may be formed in any size suitable for absorption of body exudate and can have a total weight of between about 5 grams and 12 grams.
- the sanitary napkin 10' has a length between about 17.78 cm to about 25.4 cm (7 inches to about 10 inches).
- the preferred length is generally between about 12.7 cm and 20.32 cm (5 inches to about 8 inches) as this length is discreet, effective and easily placed in the correct position.
- the width generally between about 5.08 cm to about 10.16 cm (2 inches to about 4 inches).
- the preferred width is about 6.35 cm (2.5 inches) for comfort and effectiveness in absorption of menstrual fluids.
- Manufacturing the sanitary napkin 10, 10', 10" and 100 is in accordance with known methods in the art for making such laminated structures.
- an intermediate adhesive is used to increase the adhesive's 14 bonding to the body facing surface 15.
- Suitable adhesives include hot melt construction adhesives, cohesive adhesives, and particularly preferred is a two sided tape identified as 465 double sided transfer tape available from the 3M Corporation.
- the invention has been discussed with reference to catamenial pads, the invention is also desirable for absorbent articles for use as incontinence protection. Furthermore, the absorbent article may be formed in various sizes and shapes to best conform to the body of the user. These and other variations of the invention are intended to be included by the invention which is only to be limited by the scope of the claims attached hereto.
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- Health & Medical Sciences (AREA)
- Epidemiology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Absorbent Articles And Supports Therefor (AREA)
- Orthopedics, Nursing, And Contraception (AREA)
Abstract
L'invention se rapporte à un article absorbant s'utilisant sans support et conçu pour être porté au niveau de la région des parties génitales externes du corps humain. L'article comprend une partie absorbante et un adhésif adjacent à cette dernière qui est adapté pour venir en contact avec le corps de la personne. L'article absorbant a un poids total supérieur à environ 5 grammes.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU14029/95A AU1402995A (en) | 1993-12-14 | 1994-12-14 | Absorbent article having a body adhesive |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US16759793A | 1993-12-14 | 1993-12-14 | |
US08/167,597 | 1993-12-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995016424A1 true WO1995016424A1 (fr) | 1995-06-22 |
Family
ID=22608008
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1994/014512 WO1995016424A1 (fr) | 1993-12-14 | 1994-12-14 | Article absorbant comportant une surface adherant au corps |
Country Status (8)
Country | Link |
---|---|
AU (1) | AU1402995A (fr) |
CA (1) | CA2122660A1 (fr) |
FR (1) | FR2713478B1 (fr) |
GB (1) | GB2284767B (fr) |
TW (1) | TW266153B (fr) |
UY (1) | UY23870A1 (fr) |
WO (1) | WO1995016424A1 (fr) |
ZA (1) | ZA949971B (fr) |
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Also Published As
Publication number | Publication date |
---|---|
AU1402995A (en) | 1995-07-03 |
GB2284767B (en) | 1998-06-17 |
FR2713478A1 (fr) | 1995-06-16 |
UY23870A1 (es) | 1995-05-26 |
GB2284767A (en) | 1995-06-21 |
CA2122660A1 (fr) | 1995-06-15 |
FR2713478B1 (fr) | 1996-05-03 |
TW266153B (fr) | 1995-12-21 |
ZA949971B (en) | 1995-08-23 |
GB9425177D0 (en) | 1995-02-08 |
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