CZ240099A3 - Thin and comfortable, interlabially worn absorption structure - Google Patents

Abstract

The interlabial absorbent structure (20) includes an absorbent pair parts (22) that are flexible enough to accommodate the walls of the wearer's interlabial space, each of which the absorbent member (22) has a proximal longitudinal side edge (23) and a distal longitudinal side edge (21) and a pair of opposed end edges edges (25). These parts (22) are connected by a narrow connecting part (24) which is worn during the interlabial absorption placed away from the wearer's interlabial space. Further, alternative embodiments of the narrow connector are disclosed (24) that direct the body fluids deposited thereon along longitudinal length of the interlabial absorbent structure.

Description

Thin and comfortable, interlabially worn absorbent structure

Technical field

The invention relates to those absorbent articles which are used in menstruation, incontinence pads or the like. More specifically, the invention relates to interlabial (between the female labia) worn absorbent structures that are thin and flexible so that they conform and remain in contact with the walls of the wearer's interlabial space.

BACKGROUND OF THE INVENTION

Disposable absorbent articles have been commercially successful for many years and have met with great success worldwide. For example, the continued improvement of menstrual products has greatly liberated women from the discomfort of their monthly menstrual period. However, further improvements are still needed.

One class of menstrual products, interlabially worn pads, has the potential to provide even greater relief from discomfort due to its small size and reduced risk of leakage. In the past they were made

• · • ·

Numerous attempts to produce an interlabial liner that combines the best characteristics of tampons and sanitary napkins, while avoiding at least some of the disadvantages associated with each of these product types. Examples of such products are described in U.S. Patent No. 2,917,049, issued to Delaney on December 15, 1959; U.S. Patent No. 3,420,235, issued to Harmon on Jan. 7, 1969; in U.S. Patent No. 4,595,392 issued to Johnson et al. on Jan. 17, 1986; and U.S. Patent Nos. 5,074,855 and 5,336,208 issued to Rosenbluth et al. on December 24, 1991 and August 9, 1994 respectively; and in U.S. Patent No. 5,484,429, issued to Vukos et al. on January 16, 1996. An interlabial product available in stores is the Fresh ^I n Fit ^R Padette, sold by Athena Medical Corp. of Portland, OR, and described in U.S. Patent Nos. 3,983,873 and 4,175,561 issued to Hirschman on October 5, 1976 and November 27, 1979 respectively.

However, many of these products have not met with great commercial success. All the above products are associated with deficiencies. For example, the article described in Delaney's patent does not appear to be capable of being easily inserted due to the possibility of opening layers of absorbent material during insertion. A commercially available Padette product can cause wearer discomfort even when properly inserted. This product may not fully cover the vaginal inlet or urethra (vaginal introitus or urethra) and may not provide protection when the wearer sits down. Thus, there is an opportunity to provide an improved, interlabially worn insert.

The walls of the interlabial space (gaps) are completely grooved by many folds and wrinkles. It is therefore desirable to provide interlabial absorbent structures having such flexibility that the absorbent structure may conform, at least in part, to the walls of the space between the labia of the wearer. This flexibility, especially over a wide range of wearer movements, can lead to improved containment of body fluids in a given absorbent structure and less risk of leakage and staining of underwear, clothing or bedding components.

Due to the small volume of the interlabial space, the interlabial device should also be sized so as not to exert undue pressure on the walls of the interlabial space. Otherwise, the wearer may experience discomfort due to its inappropriate size. This size determination should also take into account the possibility that when a new interlabially worn product is inserted it may not be inserted in an optimal position or position for comfort.

Thus, it is an object of the present invention to provide an interlabial absorbent structure with performance characteristics (such as wearer comfort, leak resistance, and the like) that equal or exceed those of current interlabially worn devices. Another object of the invention is to provide interlabially worn absorbent structures having sufficient flexibility to adapt to the grooved surface of the space between the labia of the female wearer and to remain in contact with the wearer over a wide range of movements.

Yet another object of the invention is to provide an interlabial-worn absorbent structure having such volume and mechanical properties that it exerts minimal pressure on the walls of the wearer's interlabial space (i.e., inner surfaces of large and small labia, or surfaces of major and minor labia).

SUMMARY OF THE INVENTION

The present invention relates to absorbent structures. More specifically, the invention relates to an absorbent structure that is worn by female wearers interlabially (i.e., in the space between their labia, labia) for the purpose of menses capture, urinary incontinence protection, or other non-menstrual vaginal discharge.

In a preferred embodiment of the invention, the interlabial absorbent structure comprises a pair of absorbent members that are joined by a longitudinally extending narrow connecting portion. In use, the narrow portion is inserted into the wearer ' s interlabial space as it is near the bottom of the vestibule. A pair of absorbent members extend from the narrow connecting portion to the sides and contact the walls of the wearer's vaginal vestibule providing resistance to leakage around the interlabial absorbent structure.

The absorbent members are sufficiently flexible so that they at least partially conform to the wrinkled surface of the walls of the interlabial space (gaps). This flexibility also allows the interlabial absorbent structure to respond to a wide range of wearer movements without becoming a source of discomfort to the wearer. These parts also have sufficient capacity provided by sufficient absorbency to absorb and retain the exudates excreted by the body of the wearer. Preferably, each absorbent member comprises a fibrous structure. More preferably, each piece comprises a tissue paper structure.

The narrow connecting portion connects the proximal edges of the absorbent members to each other and forms an interlabial absorbent structure. The connecting portion may comprise extending the absorbent members or a separate member to which the members are attached. Preferably, it comprises extending these parts.

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In a preferred embodiment, the connecting portion also directs any fluids that may be deposited thereon to flow in the longitudinal direction, thereby more fully utilizing the absorbent capacity of the absorbent members. This flow control feature can be provided in diverse embodiments by a densified fibrous web, into a V-shaped channel, or by stretching a plurality of tissue paper layers that include a preferred embodiment of each absorbent member.

BRIEF DESCRIPTION OF THE DRAWINGS

Although this description is completed by the claims that specifically explain and clearly claim the subject matter forming the present invention, it is believed that the invention will be better understood from the following description, taken in conjunction with the accompanying drawings, in which:

Giant. 1 is a plan view of a preferred embodiment of the interlabial absorbent structure of the present invention, fully aligned, with the body contacting surface facing the viewer.

Giant. 2 is a perspective view of the interlabial absorbent structure of the present invention in a collapsed configuration ready to be inserted into the interlabial space (gap) of the wearer.

Giant. 3 is an end view of an alternative embodiment of the interlabial absorbent structure of the invention.

• · · ·

Giant. 4 is an end view of an interlabial absorbent structure of the invention showing a second alternative embodiment of the invention.

Giant. 5 is an end view of the interlabial absorbent structure of the invention showing its third alternative embodiment.

DETAILED DESCRIPTION OF THE INVENTION

As used herein, the term absorbent article refers to those products that absorb and retain body exudates (exudates), and more specifically to devices placed against or near the wearer's body to absorb and retain various body excreted body. exudates. The term "disposable" is used in this material to describe absorbent articles which are not intended to be further washed or otherwise restored or reused as an absorbent article (ie, intended to be discarded after their single use) and preferably recycled, used in compost or otherwise disposed of in an environmentally compatible manner). A unitary absorbent article refers to absorbent articles that are formed from separate (separate) parts joined together to form a coordinated unit so that they do not require separate manipulative parts such as a separate holder and pad. A preferred embodiment of the unitary disposable absorbent article of the present invention is the interlabial absorbent structure 20 shown in FIG. 1. As used herein, the term "interlabial absorption structure" describes: · ·· • φφ φφ 99 ··

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ΦΦΦ · φφφφ φφφ Φ ΦΦΦ Φ ΦΦΦ ΦΦΦ

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An absorbent article which resides at least partially in the interlabial space or gap of the wearer. As used herein, the term "interlabial space" refers to the space in the pudendal region of the female anatomy, which is located between the inner surfaces of the large labia majora extending into the vestibule of the wearer. Inside this interlabial space there are small labia minora, vestibule and major urogenital parts containing the clickeris, urethra opening (urethra) and vagina opening. Standard medical authorities teach that the vestibule refers to the space limited to the sides by the inner surfaces of the small labia and extending to the base between the kliktoris and the vagina opening. Thus, it is understood that the interlabial space as defined above may refer to the space between the inner surfaces of the large labia, including the space between the inner surfaces of the small labia, also known as the vestibule. The interlabial space for the purpose of this disclosure does not substantially extend beyond the vagina opening into the vaginal interior.

The term labia as used herein generally refers to both the labia majora and the labia minora. The labia are terminated at the front and back in the front and back joints (or seam, or the medical commission). In this technique, those skilled in the art understand that there is a wide range of diversity among women with respect to the relative size and shape of their large and small labia. However, these differences need not be specifically discussed for the purposes of the invention. It is recognized that the arrangement of the interlabial structure within the wearer ' s interlabial space as defined above will require placement between the inner surfaces of the large labia, regardless of the exact location of the delineation between the major labia and the labia labia. · · · · ·

of the particular wearer. For a more detailed description of this part of female anatomy, we recommend Gray Gray Anatomy, Running Press, 1901 Ed. (1974), pages 1025-1027.

As used herein, the term pudendal refers to the externally visible female genitalia.

General description of the interlabial absorbent structure of the invention

The interlabial absorbent structure 20 shown in FIG. 1, at least partially blocks, and more preferably completely blocks, captures and absorbs the flow of menses, urine and other body exudates from the wearer's vaginal opening and urethra. The interlabial absorbent structure 20 should be of a suitable size and shape that allows at least a portion of it to fit comfortably within the wearer's interlabial space and cover the wearer's vaginal opening, and preferably also the wearer's urethra.

The absorbent interlabial structure 20 is, at least in part, held in place by exerting a slightly outwardly directed pressure on the walls of the wearer's interlabial space (gaps) and by capillary forces between its absorbent panels 22 and the naturally moist walls of the interlabial space. The interlabial absorbent structure 20 of the present invention may be worn as a "self-contained article". Alternatively, it may be worn as a backup to a tampon or in conjunction with a sanitary napkin, panty liner, or incontinent pad for use in menstruation or non-maintenance of urine. The absorbent interlabial structure 20 may be worn in traditional panties or may be used with menstrual panties.

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As shown in FIG. 1, the interlabial absorbent structure 20 has two central axes, a longitudinal central axis L and a transverse central axis T. The term "longitudinal as used in this material refers to a line, axis or direction in the plane of the interlabial absorbent structure 20 that is generally aligned in line with (for example, approximately parallel to) the vertical plane that bisects the wearer standing on the left and right body halves when the interlabial absorbent structure 20 is worn. As used herein, the terms transverse or lateral are interchangeable and refer to any line, axis or direction that lies within the plane of the interlabial absorbent structure 20 that is generally perpendicular to the longitudinal direction.

The interlabial absorbent structure 20 also has a body surface 20T that contacts the walls of the wearer's interlabial space and an opposing back surface 20R. The body surface and the back surface of other elements of the present invention will be described in a similar manner, with "T" attached to the reference numeral of the element to indicate its body surface and "R" to indicate its back surface.

The present invention relates to an interlabial absorbent structure. Giant. 1 is a plan view of an interlabial absorbent structure 20 showing a preferred embodiment of the invention. As shown in FIG. 1, the interlabial absorbent structure 20 preferably includes a pair of opposing portions 22A and 22B. (Similar marking will be used with respect to other parts comprising these parts. That is, letters A and B will be appended to the reference numerals for the different parts of the part wherever necessary or advantageous to refer an element to a particular part.) Parts 22A and 22B are connected by a narrow connecting portion 24.

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44 ·· egg, and the like, (proximal) stretching

Although other shapes such as trapezoid are suitable, the irregular (e.g., butterfly) of each part preferably has a rectangular configuration (rounded rectangle). Each part has a distal (longitudinal) side edge 21, a proximal longitudinal side edge 23, and a pair transverse to the end edges 25 with respect to the connecting narrow portion 24; these end edges 25, the distal edge 21 and the proximal edge 23 define the perimeter of each part 22. The parts 22 also have a longitudinal length X and a transverse width Y.

The interlabial absorbent structure 20 of the present invention further comprises a narrow connecting portion (istmus, bridge) connecting the portions 22A and 22B. The connecting portion 24 includes at least one fold line so that the interlabial absorbent structure can better accommodate the complex anatomy of the wearer's interlabial space. The connecting portion 24 is that portion of the interlabial absorbent structure that is positioned furthest inward into the wearer's interlabial gap. The connecting portion 24 also preferably directs any body fluids that may be stored thereon in the longitudinal direction. Each of these components will be discussed in more detail in the following sections.

Optionally, the interlabial absorbent structure 20 of the invention may further comprise some removable means, such as thread, loop, loop, and the like, to assist removal of the contaminated product. Such means will be attached to the back surface 20R (i.e., the surface opposite the body 20T of the interlabial absorbent structure 20) and will extend at least partially outside the wearer's major labia.

The strap can serve as a slipping aid by providing a stiffened gripping portion so that the wearer's fingers are protected from contamination by the parts 22 when φφφφ φ

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φφφ φ

φφ φφ «

The interlabial absorbent structure 20 is inserted into the position. Such an insertion tab may have a dimension in the longitudinal direction of between about 0.8 inches (20 mm) and about 3.0 inches (76 mm) and a caliper less than 0.12 inches (3.0 mm). The tab may have a length of between about 0.4 inches (10 mm) and about 2.4 inches (60 mm), preferably between about 0.6 inches (15 mm) and about 1.6 inches (40 mm). It should be sufficiently rigid to easily grip the wearer's fingers when the interlabial absorbent structure 20 is inserted into its interlabial space. The tab should also be flexible enough to accommodate the deformation of the space between the wearer's labia caused by the sitting position so as not to cause discomfort.

Preferably, the interlabial absorbent structure 20 also disintegrates into a number of small parts or fragments when exposed to water and gentle agitation (shaking). For example, the contaminated interlabial absorbent structure 20 preferably disintegrates into at least two pieces when thrown into a traditional toilet and subjected to relatively gentle agitation caused by flushing and passing through a typical household waste system.

More preferably, the interlabial absorbent structure comprises biodegradable components. As used herein, the term "biodegradable component" is intended to describe a material having greater than 70% biodegradability (percentage of theoretical carbon dioxide development) after 28 days as measured by the so-called " carbon dioxide " "Modified Sturm (?) ..Test, which was designated as Method 301B by the Organization for Economic Cooperation and Development. The materials comprised in the present invention preferably have a biodegradation greater than about 80%, and more preferably greater than about 90%.

Parts 22 · · 22 22 22 · 22 · 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 «· · · · · · ·

Since the parts 22A and 22B are mirror-like, the structure of the single part 22 will be described with the understanding that the same structure is preferably repeated in a given opposing part.

Each piece 22 contacts the walls of the wearer's interlabial space, thereby helping to maintain the interlabial absorbent structure 20 in the desired location throughout the wide range of wearer's movement and thereby minimizing fluid leakage around the interlabial absorbent structure 20.

The portions 22 also provide the absorbent capacity of the interlabial absorbent structure 20 for storing such body fluids. The assembly of part 22 is most clearly shown in FIG.

2. As can be seen, the part 22 comprises a plurality of individual layers 26, these layers can be secured, for example, by folding some material structure (strip) into a plurality of folds or arranging the layers of material together and joining these layers along at least one of them edges. The layers 26 are preferably formed by folding a web of material into a plurality of folds.

The member 22 may include any absorbent means that is capable of absorbing or retaining fluids (e.g., menses and / or urine). The panel 22 may be manufactured from a wide variety of liquid absorbent materials commonly used in sanitary napkins and other absorbent articles, such as pulverized wood pulp, commonly referred to as airfelt. Examples of other suitable absorbent materials include crepe cellulose wadding; meltblown polymers including coform; chemically stiffened, treated or crosslinked cellulose fibers (for example, rayon); synthetic fibers such as polyester fibers containing crimped fibers and fibers having capillary dimensional channels provided to them by the extrusion process; peat moss containing combinations of peat moss and other materials; tissue comprising tissue paper webs and laminates thereof; absorbent foams (both blown and high internal phase emulsion (HIPE) foams; absorbent sponges; superabsorbent polymers; absorbent gelling materials; or any equivalent material or combination of such materials, or mixtures thereof. tissue paper, air or wet laid structures are both suitable), woven fabric structures, nonwoven webs (e.g., carded webs, centrifugal bonded structures, meltblown webs, and the like), and thin foam layers. and 2, each panel 22 comprises a pleated web (tissue paper).

The preferred structure is preferably provided with a temporary wet strength additive to allow the tissue structure to resist loss of strength due to absorbed fluids, which may cause the interlabial absorbent structure 20 to tear and clump when exposed to the wearer's movement. The level of temporary wet strength additive should be high enough so that the absorbent structure 20 resists tearing and agglomeration, but not so large that the interlabial absorbent structure 20 resists "disintegration in the domestic piping system (interlabial absorbent structures 20 often get rid of flushing in the toilet). The interlabial absorbent structure 20 of the present invention will be dispersed into at least two fragments within about 120 minutes after placing gently stirred water at room temperature as described in the TEST METHODS section below. The disposable, interlabial absorbent structure 20 will preferably be dispersed into a plurality of small pieces within about 30 minutes after placing gently stirred water at room temperature; and more preferably within about 15 minutes after being

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99999 99 99 99 9 9 exposed to such slightly stirred water at room temperature. Gluoxalate polyacrylamide resins, available from Cytex Industries Inc, are suitable temporary wet strength additives. of Stanford, CT, under the designation Stump ™. Particularly preferred is Parez ™ 631 NC. When Parez ™ 631 NC is used at a level of between about 0.5% and about 1% in a wet laid tissue paper, the interlabial absorbent structure 20 will have a satisfactory balance between mechanical integrity during use and dispersibility during flushing.

The extrusion strength test (burst test) is used as a measure of the sensitivity of tissue paper to water exposure. The wet strength additive preferably provides the structure with a burst strength of between about 15 grams and about 200 grams. The extrusion strength is more preferably between about 15 grams and about 50 grams. The method for measuring the wet burst strength is described in the TEST METHODS section below.

Suitable tissue structures include at least 50% cellulose fibers and have a basis weight between about 10 grams per square meter and about 60 grams per square meter. Such structures can be manufactured using paper making techniques with wet process, as known in the art, or using air-laying techniques, also known in the art. These structures may further include thermoplastic fibers which, when melted, provide strength and elasticity to the structure. Structures comprising at least 90% cellulose fibers are preferred. Particularly preferred tissue materials include wet-laid tissue (tissue paper) having a basis weight of about 35 pounds per 3,000 square feet (58 grams per square meter) available from Fort Howard Corp. < tb > of Green Bay,

WI, or wet-loaded tissue paper with a basis weight of about 18 4 4 4 4 4 4 4 4

4444 444 444 pounds per 3000 square feet (30 grams per square meter), available from The Procter & Gamble Company as CHARMING toilet paper. As noted and shown in FIG. 2, it is provided by folding the preferred structure of the sheet material part 22 (folding) into a plurality of folds and forming layers 26. As can also be seen in FIG. 2, these layers 26 are arranged laterally with their sides to each other. The web may be folded so that it can have any number of layers 26. Preferably, the number of layers 26 is sufficient to provide the desired absorbent capacity of the interlabial absorbent structure 20 (unless an auxiliary capacity in the form of superabsorbent polymer or the like is provided), to cause discomfort to the wearer. The web is preferably folded such that the dry weight of the interlabial absorbent structure 20 is less than about 7 millimeters, more preferably less than about 5.5 millimeters, more preferably less than about 4.5 millimeters. The number of layers 26 provided to each part by such folding will depend on the thickness of the web of material being folded. The method of dry thickness measurement is provided below in the TEST METHODS section.

The layers 26 are preferably joined or joined at least one of their distal (distal) longitudinal edges 21 or at their proximal edges 23 in any suitable manner to ensure that the parts 22 remain in a folded configuration and do not expand. The layers 26 may be folding, (hemming), adhesive means (for example, by means of a silk yarn or artificial thermal bonding (if the fabric structure is bonded by a variety of compression stitching by silk stitching) and also includes thermoplastic bonding fibers). The layers are «· ············ · and · # ·« ··· · · · · · · Preferably connected by folding the web of structure into a plurality of folds such that the layers 26 are at least partially joined at their more distal edges 21 and by joining the layers 26 at the closer edges 23, and define a narrow connecting portion 24 using means known in the art. The stitching is particularly preferred for joining the layers 26 at the closer edges 23.

Each part 22 should be of a suitable size and shape such that the interlabial absorbent structure 20 fits comfortably within the interlabial space. That is, each panel 22 should be sized such that the panel covers the "straight line of view from the distal (distal) edge of the wearer's major labia to its vaginal introit (entrance). As noted above, the panel 22 preferably has a rounded rectangular shape as shown in FIG. Each portion 22 preferably has a surface area between about 8 square centimeters and about 65 square centimeters. More preferably, the surface area of each panel 22 is between about 10 square centimeters and about 35 square centimeters. In other words, each piece 22 may have an "X" dimension of between about 2 inches (5 centimeters) and about 6 inches (15 centimeters), and an "Y" dimension of between about 0.6 inches (1.5 cm) and about 2 inches ( 5 centimeters).

The thickness or tactility of each component 22 is also important with respect to the wearing comfort of the interlabial absorbent structure 20 and the absorbent capacity of the interlabial absorbent structure 20. As noted above, this thickness should be sufficient to provide the desired absorbent capacity of the interlabial absorbent structure 20. , but not so great as to cause discomfort to the wearer. Preferably, the thickness of each panel 22 is between about 1 millimeter and about 3.5 millimeters _f, preferably between about 1.5 and 3 millimeters.

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More preferably, the thickness of each panel 22 is between about 1.5 and 2.5 millimeters.

When the interlabial absorbent structure 20 is folded for use, as shown in FIG. 2, and fully saturated with 0.9% aqueous saline, the thickness should be less than about 15 millimeters, preferably less than about 6 millimeters, and more preferably less than about 4 millimeters, at a limiting pressure of 0.25 psi (1.7 kPa) . A method for measuring dry and wet structure thickness is provided below in the TEST METHODS section.

The interlabial absorbent structure is preferably provided with sufficient absorbency to absorb and retain exudates excreted by the body of the wearer. The absorption capacity is controlled by the amount and composition of the individual layers 26, the volume of the interlabial absorbent structure 20 and the presence or absence of superabsorbent polymers, absorbent gelling materials and the like. Depending on the particular structure selected for panel 22, the panel may have an absorbent capacity of 0.9% aqueous saline between about 1 gram and about 30 grams. Preferably, the absorption capacity of the 0.9% aqueous saline solution is between about 1 gram and about 15 grams, more preferably between about 2 grams and about 10 grams. The method for measuring the absorption capacity is provided below in the TEST METHODS section.

Also, each portion 22 is also preferably sufficiently flexible to accommodate the milled surface of the wearer's interlabial space. This flexibility also allows the interlabial absorbent structure to respond to the wearer ' s movements without exerting a noticeable force or pressure on the wearer ' s body (i.e., high flexibility enhances wearer comfort). This flexibility can be characterized as follows: if the parts have a stiffness of less than one sheet of toilet paper, such as CHARMING ^, they are too flexible and the risk of clumping during the period of time. 9 9 * 9 9 9 9 9 9 wear is unacceptably high; if these parts have a stiffness similar to that of a traditional writing paper sheet, they are too stiff and would not be able to adapt to the folding of the walls of the interlabial space and to respond to the movements of the wearer.

In an alternative embodiment (not shown), each portion 22 may be provided with a plurality of preferred bending lines to accommodate unsymmetrical expansion of the labia during certain movements such as those when one leg is pushed to the side or the movement of asymmetric squatting. In addition, such a plurality of preferred bending lines are also advantageous because the walls of the interlabial space need not be symmetrical - often one part of the labia minora or labia major is longer than the other.

In one preferred embodiment of the present invention, the inner layer 27 of each panel 22 comprises tissue paper having a greater wet shear strength than the wet shear strength of the remaining layers 26. Because it is the wearer ' s fingers that are most likely to contact the inner layer 27 during insertion and removal. the interlabial absorbent structure 20, this greater punch strength provides additional resistance to "puncture," especially when the interlabial absorbent structure is wetted by absorbed body fluids, without substantially adversely affecting other properties. This resistance gives the wearer additional confidence that his or her hands will not become unacceptably soiled when inserting or removing the interlabial absorbent structure 20. Suitable materials have a wet burst strength of at least about 30 grams and at least twice the wet burst strength of the layer forming material 26, preferably the wet burst strength of the inner layer 27 is greater than about 50 grams. A suitable material has a basis weight of about 3,000 square feet (23.3 grams per square meter), contains a temporary wet strength additive needed to provide the desired punch strength, and can be manufactured using the methods described in US Patent 3,301

746, issued to Sanford et al. on 31 January 1967.

Since the inner layer 27 of this preferred embodiment comprises a different material than the remaining layers 26, it can be attached to the remaining layers 26 using means known to those skilled in the art. For example, the layer 27 could be attached to the remaining layers 26 using an adhesive flange (not shown) or other such means known to bond two layers of material.

Optional parts 22

If desired, each part 22 may also include other optional components. For example, each piece may comprise as its body contacting surface 22T a topsheet and / or a backsheet as its bottom (back) surface 22R. If the interlabial absorbent structure 20 also includes a topsheet and a backsheet, the topsheet and the backsheet are preferably joined together along the distal edge 23 and end edges 25 of each panel 22.

The topsheet is adaptable, soft feeling and non-irritating to the wearer's skin. Further, the topsheet is a liquid pervious member allowing fluid (e.g., menses and / or urine) to readily penetrate through its thickness. A suitable topsheet may be manufactured from a wide variety of materials such as woven and nonwoven materials, polymeric materials such as apertured formed thermoplastic films, apertured plastic films and hydroformed thermoplastic films, porous foams,

• ftft ftft reticulated foam, reticulated thermoplastic film and thermoplastic scrim. Suitable woven and nonwoven materials may be composed of natural fibers (for example, wood or cotton fibers), synthetic fibers (such as, for example, polyester, polypropylene or polyethylene fibers), or a combination of natural and synthetic fibers. A particularly preferred nonwoven material for use as the topsheet comprises a hydrophilic, centrifugal bonded material having a basis weight of about 0.68 ounces per square yard (23 grams per square meter) as supplied by Corovin GmbH of Penne, Germany, such as Corolind H23GSM.

The body-facing surface of the topsheet is preferably hydrophilic, so it helps the fluid to be carried by the topsheet more easily than if the body-facing surface is not hydrophilic, thereby reducing the likelihood that menstrual fluid will flow from the topsheet rather than into it flowed through and was absorbed by the absorbent core. For example, an active surfactant may be incorporated into the polymeric sheet materials of the formed film as described in U.S. Patent Application Serial No. 07 / 794,745, filed Nov. 19, 1991 by Aziz et al., The disclosure of which is incorporated herein by reference. Alternatively, the surface to the topsheet body may be rendered hydrophilic by treating it with an active surfactant, as described in U.S. Patent 4,950,264, issued to Osborn on August 21, 1990, the disclosure of which is incorporated herein. by reference.

The backsheet is preferably impervious to body fluids (e.g., menses and / or urine) and is preferably made of a thin plastic film, although other flexible, liquid impermeable materials may also be used. As used herein, the term flexible refers to materials that are compliant and easy to conform

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444 4 4 4 4 44 44 44 I adapt the overall shape and contours of the human body. In addition, the backsheet provides protection to the wearer from soiling his hands when slipping or removing the interlabial absorbent structure 20 of the present invention. Thus, the backsheet may comprise a woven or nonwoven material, polymeric films such as thermoplastic films of polyethylene or polypropylene, or composite materials such as a film-coated nonwoven material. For example, the backsheet may comprise a polyethylene film having a thickness of from about 0.012 mm (0.5 mils) to about 0.051 mm (2.0 mils). Exemplary polyethylene films are manufactured by Clopay Corporation of Cincinnati, Ohio under the designation P18-04O1; and Ethyl Corporation, Visqueen Division of Terre Haute, Indiana, under the designation XP-39385. More preferably, the backsheet comprises resin-impregnated tissue material, making the material water-resistant. Such water-resistant materials can be made according to the procedure described in U.S. Patent 5,558,344 issued to Ahr et al. on November 26, 1996, the disclosure of which is incorporated herein by reference.

Narrow connecting part 24

As noted hereinabove, the interlabial absorbent structure 20 comprises two portions 22A, 22B which are joined by a narrow portion 24. This narrow portion 24 connects the portions 22A, 22B, and provides a preferred bending line for forming the interlabial absorbent structure 20 into a configuration suitable for use. . Preferably, the connecting portion 24 also provides means for longitudinally directing any fluids stored thereon.

The connecting portion 24 may include extending the material forming the parts 22A and 22B, or may comprise a separate portion.

an element to which these parts 22A and 22B are attached. Preferably, the connecting portion comprises extending the material forming the parts 22A and 22B.

In its simplest embodiment, this narrow connecting portion is only a region between the portions 22A and 22B when the portions are folded. As noted above, the portions 22 preferably have a rounded rectangular configuration. This means that the narrow portion 24 will, in its simplest embodiment, include closer edges 23A, 23B, portions 22A and 22B. Preferably, the connecting portion 24 is defined by the preferred fold lines that define the proximal edges 23A and 23B as shown in FIG. 1 and 2.

Preferably, however, the connecting portion 24 has a measurable length (preferably slightly shorter than the length X of the portions 22) and a width that can be defined as the lateral (lateral) distance between the proximal edges 23A, 23B, the parts 22. 23B is between about 1 millimeter and about 7 millimeters. Preferably, this lateral distance is between about 2 millimeters and about 6 millimeters. More preferably, the distance is between about 3 and about 5 millimeters. A person skilled in the art will confirm that this distance may be somewhat greater than the combined thickness of the two portions 22A, 22B that constitute a preferred embodiment of the present invention.

These applicants have found that the walls of the interlabial space are surprisingly insensitive, except for the part closest to the outer surface of the major labia and the transition zone between the interlabial space and the vagina (i.e., the anthem ring). This means that any part of the interlabial absorbent structure 20 which, when worn, lies within these relatively insensitive portions may have a surprisingly large thickness. In other words, the connecting portion 24, as mentioned above, may have a thickness (side-to-side distance) that is greater than the thickness of the parts (a portion of these parts) can extend outside the interlabial space, placing this part in the sensitive area of the interlabial space). As a result, the connecting portion 24 may be designed to provide additional power to the interlabial absorbent structure 20 by taking advantage of this "extra thickness". Giant. 3-6 illustrate end views of interlabial absorbent structures having several alternative embodiments of the narrow link portion 24. Each of these embodiments provides the interlabial absorbent structure 20 with the benefits of additional power and will be discussed individually below.

In FIG. 3 includes a narrow compression zone portion 24 wherein the portion of the interlabial absorbent structure 20 lying between the proximal edges 23A and 23B of portions 22A and 22B (ie, the connection portion 24) has been compressed to provide a compression zone to promote longitudinal distribution of body fluids that are deposited on the interlabial As noted above, the connecting portion 24 is that portion of the interlabial absorbent structure 20 that is located furthest into the gap between the labia of the wearer. Thus, it will be the first part of the interlabial absorbent structure 20 that will absorb body fluids that are released by the vaginal opening or urethra. Thus, body fluids deposited on the connecting portion 24 will be encouraged to flow along the connecting portion through a compressed zone, making more complete use of the absorbent capacity of the parts 22A and 22B.

If desired, the connecting portion 24 of this embodiment may include alternating regions of low and higher density (not shown). This will provide the added benefit of increased reception rates in the lower density zones (i.e., having a density similar to the parts 22) and flow along the connecting portion 24 when the receiving zone becomes saturated in the flflfl flflflfl zones.

higher density (i.e., having the compressed density discussed above).

Compression of the region between proximal (proximal) edges 23A and 23B such that the connecting portion 24 comprises a compression zone may be accomplished using means known in the art. For example, a portion of the interlabial absorbent structure 20 comprising the tie portion 24 could be passed through a pinch roller to increase its density, while the remainder of the interlabial absorbent structure 20 is not densified. While the density in the compression zone would be increased by such a processing step, it should not be increased so much that the absorbency rate becomes unacceptably low (it is well known that the absorbency rate and density are inversely related to fiber structures such as the preferred multilayer structure). of the present invention). A density similar to that of the ducts in ALWAYS sanitary napkins with the ducts available from The Procter and Gamble Company, Cincinnati, OH, has been found to provide a satisfactory balance between the longitudinal direction of body fluid flow and the rate of absorbency.

A second alternative embodiment of the narrow coupling portion 124 is shown in FIG. 4. In this case, the portion of the interlabial absorbent structure 20 that lies between the proximal edges 23A and 23B has been folded so that the connecting portion 124 takes shape into "V. This V-shape provides a channel 127 for longitudinally directed body fluids that can be arranged on the connecting portion 124. A person skilled in the art will confirm that the V-shape is not the only shape that provides a channel suitable for the longitudinal direction of body fluids. A non-limiting list of other suitable shapes includes: a semicircular, U-shaped and any other shape capable of forming a continuous channel that is open at its top. The shape into "V" is preferred because its formation using the traditional ·· φ φ • • φ φ φ φ φ φ φ φ φ φ φ φ φ

Sklád technik · sklád sklád · · · sklád sklád sklád sklád sklád sklád technik technik technik technik technik Preferably, the connector portion 124 further comprises a resilient portion 128 that is disposed below the fibrous portion 125 of the connector portion 124, as also shown in FIG. 4.

The V-shaped channel 127 of the alternative embodiment of the coupling portion 124 shown in FIG. 4, divides the stored body fluids in the longitudinal direction in a manner similar to that described above. Such a composite structure has the additional advantage that it has a faster acceptance rate than the embodiment of the compressed zone shown in FIG. This increased acceptance rate is due to the fact that the fibrous web structure of the preferred embodiment of the interlabial absorbent structure 20 as described herein is not densified. Rather, its capillaries are more open, with the resultant increase in acceptance rates.

The connecting portion 124 further comprises an M-shaped resilient portion 128 disposed beneath the fibrous portion 125 as shown in FIG. 4. The resilient portion 128 pours for two purposes: 1) the resilient portion 128 serves to resist compression forces due to wearer's labia that will tend to close the channel 127a; 2) the arms of the " M " serve to stretch the parts 22A and 22B apart, resulting in improved contact with the walls of the interlabial space.

The resilient portion 128 needs to be sufficiently durable to resist complete closure of the duct 127 (i.e., to have sufficient compression resistance), but not to be so rigid as to become a source of discomfort to the wearer. Examples of some suitable non-absorbent materials that may be placed under the fiber portion 125 include thermoplastic polyethylene, polypropylene, synthetic foams, sheets, or nonwoven materials having the desired compression resistance. One exemplary foam material for use as the resilient portion 128 is radiation

9 * 99

9,999 99 ««

9,999,999

9999 999 9,999,999

99999 9 9 9

999 99 99 99 99 99 cross-linked, closed-cell polyethylene foam, known as Volara 2A, available from Voltek Corp., Lawrence, MA.

In the V-shaped configuration of the embodiment of the connecting portion 124 shown in FIG. 4, may be formed as follows: 1) providing a resilient portion 128 that is preformed to an " M "shape; 2) providing a fastening means (not shown) for attaching the elastic portion 128 to the fibrous portion 125 to the upper surface of the elastic portion; 3) arranging the elastic portion 128 along the longitudinal centerline L and adjacent the lower surface of the fibrous portion 125; and 4) recessing the fibrous portion 125 so that its lower surface contacts the fastening means, which connects the fibrous portion 125 to the resilient portion 128 and causes the connecting portion 124 to take up the "V.

A third embodiment of the coupling portion 224 is shown in FIG. 5. In this embodiment, the layers 26 extend at a distance " Z " beyond the proximal edges 23A and 23B of the portions 22. The parts 22A and 22B are joined at their proximal edges 23A and 23B by a plurality of fine (discontinuous) fastening means 230. that the space between the elongated portion of the layers 26 promotes longitudinal distribution of body fluids that are disposed on the narrow connecting portion 224. Also, since the fastening means 230 are spaced apart, the structure shown in FIG. 5 provides a pathway for these stored fluids to flow into the volume between the layers 26 in the panels 22A, 22B (as discussed above, the void between the layers 26 provides capacity to absorb cell debris, blood clots and the like that would otherwise clog capillaries within individual layers of tissue material.

This embodiment of the coupling portion described above and shown as 224 in FIG. 5 includes an elongated portion 225 fcfc · fc fcfc · fc · fcfcfcfc · fcfcfcfc fcfcfcfc fcfcfcfc · fcfcfc · fcfcfc · fcfc · materiálu f materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu materiálu. The portion 225 extends a distance "Z" beyond the proximal (proximal) edges 23A and 23B of the portions 22 and forms a connection portion 224. As will be appreciated, the distance "Z" is important in that: 1) if this "Z is too short, the connection portion 224, it will be difficult to manufacture or, 2) if "Z is too large, the elongated portion 225 will tend to fold, which could block the path into the void between the layers 26. The insertion difficulty can also be increased if" Z is too large. Preferably, the distance Z is between about 1 millimeter and about 5 millimeters. More preferably, Z is between about 1 millimeter and about 3 millimeters.

The dimension "Z" in conjunction with the properties of the layer forming material 26 also defines the compression stiffness of the connector portion 224. The stiffness of the connector portion 224 will affect the wearing comfort of the interlabial absorbent structure 20. The compression stiffness should be less than or equal to about 500 grams. The compression stiffness is preferably less than about 300 grams, and more preferably less than or equal to about 200 grams. A method for determining compression stiffness is provided below in the TEST METHODS section.

The portions 22A and 22B are joined at their proximal edges 23A and 23B by using a plurality of fine (discontinuous) fastening means 230 to form the connecting portion 24.

These fine fastening means 230 may include any means known in the art to join the parts 22A, 22B, in a plurality of spaced locations along their proximal edges 23. For example, the parts could be joined using stitching (e.g., cotton thread or silk), thermal bonding (if the layers contain a thermoplastic material), adhesive points, or any other such fastening means known in the art.

··· «• · · · · ·

technice. The parts 22A and 22B are joined together preferably by their stitching.

To deploy the interlabial absorbent structure of the present invention, the wearer folds the structure along its longitudinal centerline L so as to assume an arrangement similar to that shown in FIG. 2. The wearer grasps the structure adjacent its more distal edges 21A and 21B, expands its labia and inserts the structure so that the connecting portion 24 is in close proximity to its pelvic floor. When it releases the more distal edges 21A and 21B, its labia are closed around the interlabial absorbent structure 20, keeping it in position (in position). As discussed above, the portions 22A and 22B will conform and remain in contact with the walls of the space between the wearer's labia over a wide range of wearer's movements.

METHODS OF TESTING

PRESSURE STRENGTH TEST

Overview

The test specimen held between the annular fixtures is subjected to an increased force which is applied by a polished 0.625 inch stainless steel ball (approx.

15.8 mm). The bursting strength is the force that causes damage to the sample material (or rupture). The punching strength can be measured on dry or wet samples.

Equipment

Burst tester:

To edit a room:

Paper cutting:

Pan:

Solution:

Timers:

4444 44 * 44 44

4 4 4 4 4 4 4 4 4

44 * · 444 444 44 «

44443 4 4 4

444 44 44 44 44 44 IntelectII-STD Tensile Tester, Cat. No. 1451-24PGB or Thwing-Albert Burst Tester, both are suitable. Both instruments are available from Thwing-Albert Instrument Co., Philadelphia, PA.

The instruments shall be equipped with a 2000 g load cell and, if wet burst strength measurements are to be made, both instruments shall be equipped with a load cell housing and a front water cover.

temperature and humidity should be controlled to stay within the following limits:

Temperature: 73 + 3 ° F (23 ° C + 2 ° C).

Humidity: 50 + 2% RH.

scissors or other equivalent may be used.

for wetting the samples to test the wet strength, suitable for the size of the test sample.

the water soaking sample for wet penetration testing should be equilibrated to the temperature of the conditioned room.

suitable for measuring the soaking time.

Sample preparation φφφφ • · • ·

• ΦΦΦ φ φ • • • • • • • • • • φ • • • •

1) Cut the appropriate sample to a size suitable for testing (minimum sample size 4.5 inches x 4.5 inches (114.3 mm x 114.3 mm). Prepare a minimum of five samples for each test condition.

2) If wet punch strength measurements are to be made, place the appropriate number of cut specimens in a pan filled with water at a temperature equal to the temperature of the conditioned room.

Device settings

1) Set the test rig to measure burst strength according to the manufacturer's instructions. If the Intelect-II-STD tensile tester is to be used, the following settings will be appropriate:

Speed: 12.7 centimeters per minute,

Burst sensitivity: 20 grams,

Maximum load: 2000 grams.

2) Calibrate the load cell according to the expected punch strength.

Measurement and reporting of results

1) Operate a burst strength testing device according to the manufacturer's instructions to obtain a burst strength test for each specimen.

2) Record the burst strength for each sample and calculate the mean and standard deviation for the burst strength for each test condition.

4

4 4 4 4

4,444 4444 * 4,444 4444 • 444 4,444 444,444

44444 4 · · 4 44 »44 44 44 44

3) Report the mean and standard deviation for each condition to the nearest gram.

Report the mean and standard deviation for each group of the four samples.

Dry sample thickness

Principle

The thickness or caliper of the dry sample can be determined using a comparator gauge that is weighed to provide a predetermined limiting pressure.

Apparatus

A suitable comparative gauge is the Ames Model 130 with a Model 482 Dial Indicator, available from B.C. Ames Company of Waltham, MA. The comparator gauge should have a circular comparator foot made of aluminum capable of exerting a load pressure of 0.25 pounds per square inch (1.7 kPa). It will be appreciated that the diameter of the comparator foot can be varied to accommodate the size of the various samples as long as the load pressure remains constant.

..

1. The comparator scale is reset according to the manufacturer's instructions.

2. The comparator foot is raised and the specimen is placed on the base plate. The sample is placed on the substrate so that when the foot is lowered, it remains in the center of the sample. The comparator foot should be at least 5 millimeters • ftftft • ftft ftft ftft • ftft • ftft from all edges of the sample. Try to even out or avoid any wrinkles in the sample.

3. Gently lower the sample foot.

4. Determine the thickness by reading the comparator dial 30 seconds after the comparator foot contacts the specimen.

5. Repeat steps 2 to 4 for additional 2 samples.

Calculations

The average of three readings (data) is the thickness of the material.

Wet sample thickness

Principle

The thickness or caliper of a product can be determined by using a motorized micrometer that measures the perpendicular distance between two major surfaces of the product under prescribed conditions. Using this device, measurements are taken and reported to the nearest 0.1 millimeter.

Equipment

Absorbent paper or absorbent towel clean, dry.

Modified room: controlled temperature and humidity in it, within the following limits:

Temperature: 73 + 2 ° F (21.6 ° C to 23.8 ° C).

Humidity: 50 + 2% RH.

Flat pan for sample immersion: larger than the largest sample by at least 100%.

• · · · · · · · · · · · · · ·

Timer: digital stopwatch.

Micrometer:

Scissors:

Solution:

a suitable micrometer is the Model 89-11 Electronic Thickness Tester, available from Thing-Abert Instrument Co., Philadelphia, PA. The sample load should be 0.25 pounds per square inch (1.7 kPa).

office scissors, with a blade of 7 inches (177 mm) in length, or equivalent, aqueous saline solution (0.9%) at room temperature.

General instructions

The following procedures should be followed:

1. Set and calibrate the micrometer as described in the manufacturer's instructions.

2. Do not use parts of the sample cut with the punching tool if multiple samples are available. When cutting the specimen in the punch, there is some compression of the paper, which may cause the results (thickness) to be small.

3. Do not read micrometers for wrinkles from folds.

4. Do not use micrometer reading on paper with obvious defects such as wrinkles, holes, tears. If parts of the sample have defects of this kind that make them unsuitable for testing, discard them. Replace them with another part of the sample that does not have these defects, selecting replacement samples from the same layer or area in the sample.

• 4 4 4 4 4 4 4444 444 444

44444 4 4 4 • 444 44 44 44 44

In general, select parts that are not intended for other tests.

5. Minimize the handling of the sample surface area to a minimum. If possible, touch only the edges.

6. Do not test the same area of a sample portion more than once; anvil pressure (fixed gauge contact) can cause changes in thickness.

7. Do not allow the instrument cycle to force you to read data too fast to pay due attention to correcting the procedure.

8. After testing, always turn off the micrometer using the pressure foot at the bottom in contact with the anvil.

Sample preparation

Obtain at least three samples and read with a micrometer at the center of each sample.

Sample conditioning Not required.

Pre-measurement procedure

Before analyzing each sample or series of samples, run the micrometer motor and then adjust the setting to zero micrometer according to the manufacturer's instructions.

Immediately prior to measurement, run the sample in a shallow pan with saline so that the sample is completely immersed in it.

Immediately after wetting, start the stopwatch and allow the sample to remain submerged for 10 minutes. Remove the sample from the saline solution using both hands and gripping (clamping) on two sides adjacent the longitudinal line (specimens hanging vertically in the transverse direction). Quickly leave the sample • · · · · · · ft

drip while holding it almost in this vertical plane, but by placing the lower edge to dry the absorbent surface (eg BOUNTY paper towels). Drip for 30 seconds and start the measurement as described below.

Execution

Turn on the micrometer motor, and then set the micrometer zero to the manufacturer's instructions, analyzing each portion of the sample or part of a series of samples.

With the foot in its upper position, place part of the sample on the anvil (fixed measuring contact) of the micrometer. The appropriate portion of the specimen shall be carefully placed on the firm contact so that when the foot comes down at least 0.50 inches (1.27 cm) from the edges of the specimen portion. With the foot in its lower position, read the micrometer gauge panel to the nearest 0.1 millimeter before the end of the dwell time. Record the reading on the micrometer to the nearest 0.1 millimeter. Proceed in this way for each part of the sample.

Keep an eye on the zero setting. If the measurement panel is currently showing 0.1 millimeter or more from zero, stop testing. Clean the surface of the presser foot and the solid contact and reset the micrometer.

At the end of the test, when using the Thwing-Albert instrument, set the instrument to the STAND-BY position before turning off the main power switch.

Calculations

Calculate the mean and standard deviation of the micrometer reading for each sample and write the average thickness for each sample to the nearest 0.1 millimeter.

Ftft ftft ftft ftft ftftft ftftft ftftft 9 ftftftft ftftftft ftftft ftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftftft

ABSORPTION CAPACITY

The absorption capacity can be determined as follows. The product concerned is weighed to the nearest 0.1 grams. The product is then immersed in a beaker with sterile 0.9% saline (available from Baxter Travenol Company of Deerfield, IL) such that the product is completely submerged and is not bent or otherwise twisted or folded. The product is immersed in solution for 10 minutes. The product is then removed from the saline solution and suspended for two minutes in an upright position to allow the saline solution to drip from there. Then, the article is placed with a body facing surface down onto absorbent absorbent paper such as, for example, # 631 filter paper, available from Filtration Science Corp., Eaton-Dikeman Division of Mount Holly Springs, PA. A uniform load of 17.6 grams per square centimeter is placed over the product to force excess fluid out. The absorbent paper is replaced every 30 seconds until the amount of fluid transferred to the absorbent drinker is less than 0.5 grams within a 30 second interval.

The product is then weighed to the nearest 0.1 gram and the dry weight of the product is deducted. The difference in grams is the absorption capacity of the product.

Compression stiffness

Equipment

Compressive / Tensile Tester: This test requires a constant measure of compressive and tensile testing equipment such as compressive strength tester. Aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa INSTRON Model 4502, available from Instron Corporation of Canton, MA.

Load cell: Ten Newton compression load cell suitable for use with a pressure / tension tester.

T-bar: The T-bar comprises a pair of metal rods having a diameter of 6.40 mm, perpendicularly assembled together in a T-configuration. The drive rod (the longer one) is about 125 mm in length and the push rod (the shorter one) is about 75 mm long. The end of the drive rod is preferably conical to match the circumference of the push rod and both are glued, welded and / or screwed to each other. The opposite end of the drive rod is attached to the crosshead unit of the pressure / tension tester.

Sample fixture: an adjustable fixture having opposite vertical faces and a horizontal top surface.

Method

1. Adjust the compressive / tensile tester according to the manufacturer's instructions.

2. Clamp the specimen so that the 1.0 cm portion of the specimen (compression section) extends perpendicularly above the horizontal surface of the fixture.

3. Center the T bar on the specimen, with the push bar perpendicular to the long side of the specimen surface parallel to the horizontal surface of the fixture.

4. Lower the T bar until a force of 4.5 ± 0.5 grams is applied to the specimen.

· · · · »>» »>>>> * * * * * * * * * * * * * * * * * * * * * * ·· * · ··

5. Compress the product surface by 5.0 mm at a crosshead speed of 2 inches / minute (51 millimeters / minute).

6. Record the greatest strength.

7. Repeat the procedure for at least 10 samples.

Calculations and recording

Calculate and write the mean and standard deviation of the highest force for each sample evaluated.

Dispersibility in water

Equipment

Stirrer:

Stirring stick:

Thermometer:

Timing device: Stroboscope

Beaker:

magnetic, Thermolyne Model S7225 or 7200 (no other). Permanently write a 3.5 inch (8.9 cm) circle on the top surface of the mixer. The center of this circle shall coincide with the geometric center of the agitator.

2.5 inches (6.2 cm) long, Teflon coated, with a centrifugal ring. Permanently label one end of this stick with black ink at a distance of 0.5 inches (1.2 cm) from its tip.

with a scale of 30 to 120 ° F (-1.1 to 48.8 ° C) divided into steps.

digital stopwatch.

is a suitable variable speed strobe, Model 964, available from Strobette, Power Instrument, Inc. from Skokie, IL.

Kimax brand, 2000 milliliters, with spout (and no) · ft · ft · ft · ft · ft · ft · ft · ft · ft · ft · ft · ft · ft · ft · ft · ft · ft · ft · ft · ftftft ftft · ftp · · · · · · · ft ·)))))))))))))))))))))))))))). Do not use a beaker without a flat bottom.

Test preparation

1) Fill the beaker to the fill mark with tap water at 73 + 3 ° F (23 ° C + 2 ° C).

2) Place the beaker on the magnetic stirrer by centering it in the inscribed circle.

3) Add the stirring bar to the beaker.

4) Turn on the strobe and set the speed to 1000 rpm. according to the manufacturer's instructions.

5) Turn on the magnetic stirrer using the two-position switch and adjust the speed of the magnetic stirrer until the stir bar appears stationary and both ends black. This indicates that the magnetic stirrer is rotating at 500 rpm. (i.e., half the setting on the stroboscope). Switch off the magnetic stirrer with the two-position switch.

Test performance

1) Hold the sample 3 to 4 inches (7.6 to 10.2 cm) above the water surface. Gently lower the sample onto the water surface and lower the stopwatch when the sample touches the water surface.

2) Wait 5 seconds.

3) Start the magnetic stirrer using the on / off switch.

4) Record the time taken to divide the sample into at least two pieces.

5) Repeat steps 1 to 4 for the other 3 samples.

· • · • φ φ • • • • • φ φ φ φ φ φ φ φ φ φ φ φ φ φ φ φ φ φ

Calculation and reporting of results

Calculate and report the mean and standard deviation of the time for dispersion in water for the four samples tested.

xxx

The disclosures of all patents, patent applications (and any patents derived therefrom, as well as any corresponding published foreign patent applications) and publications mentioned throughout this disclosure are hereby incorporated by reference. However, it is not expressly admitted that any of these documents incorporated herein by reference discloses or describes the present invention.

Although particular embodiments of the invention have been illustrated and described, it will be apparent to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the invention.

Claims (10)

1) An interlabial absorbent structure for wear within an interlabial space (gaps between female labia) having opposing walls, the interlabial absorbent structure having a longitudinal centerline, a body contacting surface, and an opposing posterior surface, and comprising: a pair of absorbent members; each portion having a proximal (proximal to the connecting portion) edge, a distal (distal from the connecting portion) edge, and a pair of opposed end edges; characterized in that each of said parts has sufficient flexibility so that it at least partially conforms to the surface of said wall and is able to maintain contact with said surface while wearing the interlabial absorbent structure; and a narrow connecting portion connecting the proximal edges of said absorbent members, said connecting portion being positioned furthest inwardly into the interlabial space when the interlabial absorbent structure is worn. Interlabial absorbent structure according to claim 1, characterized in that after two hours of exposure to slightly flowing water, the structure is dispersed into at least two fragments. 3. The interlabial absorbent structure of claim 1, wherein the absorbent structure of claim 1 is 99 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 · 9,999 9,999,999 9 9 9 9 9 99999 99 99 99 99, characterized in that each of the absorbent panels comprises a plurality of tissue paper layers which are joined at said distal edge of the panel. 4. The interlabial absorbent structure of claim 3, wherein the tissue paper comprises a temporary wet strength additive. 5. The interlabial absorbent structure of claim 3, wherein the tissue paper has a wet burst strength of between about 15 grams and about 200 grams. 6. The interlabial absorbent structure of claim 1, wherein said narrow connecting portion comprises a densified portion of absorbent member materials. 7. The interlabial absorbent structure of claim 1, wherein the narrow bonding portion further comprises a fibrous member comprising extending the materials constituting the absorbent members, and a resilient portion forming part of said back surface and disposed along the longitudinal centerline. 8. The interlabial absorbent structure of claim 1, wherein the narrow connecting portion comprises extending the materials that form the absorbent members beyond their proximal edges, the members being joined at the proximal edges by a plurality of separate (fine) fastening means. 44 ·· ·· 44 44 «4« · · · · · · 4 · 4 · · · · · 44 4 44 ·· ··· 4 ··· ··· 44 ··· · 3 · 4 ·· · 4 ·· «4 44 44 9) The interlabial absorbent structure of claim 1, further comprising a means of removing it attached to the back surface of said narrow connecting portion. 10. The interlabial absorbent structure of claim 3, wherein each of said absorbent portions further comprises a topsheet disposed on the body surface thereof, and a backsheet disposed on its back surface, the topsheet and backsheet being joined along their said sides. end and distal edges.