MXPA00001279A - Anatomically shaped disposable absorbent article with high lobe resiliency - Google Patents

Abstract

An anatomically shaped disposable absorbent article having a front end portion and a rear end portion and a periphery, and comprising a liquid pervious topsheet, a multilayer backsheet joined to said topsheet and an absorbent core intermediate the backsheet and the topsheet. The anatomically shaped disposable absorbent article has lobes provided by the topsheet and the backsheet extending beyond the absorbent core and has a reduced tendency to form folds in the lobes during the use.

Description

ABSORBENT ARTICLE DISPOSABLE ANATOMICALLY FORMED WITH RESILIENCE OF THE HIGH LOBE FIELD OF THE INVENTION The present invention relates to disposable absorbent articles. Disposable absorbent articles are considered to be absorbent devices designed to be carried externally to the body by a user and to receive the discharged fluids from the body. In particular, the present invention relates to pantiprotectors, sanitary napkins, catamenial products and inserts for incontinence, disposable absorbers, which are anatomically formed and exhibit an increased capacity to recover their original substantially flat configuration after bending.

BACKGROUND OF THE INVENTION In its basic form, the disposable absorbent articles comprise an absorbent core interposed between an element that is in contact with the body, permeable (alternatively referred to as a top sheet or wrapper) and a protective waterproof barrier (alternatively referred to as a back sheet). The absorbent element is, of course, intended to receive and contain the discharged fluids from the body. The element that is in contact with the body is intended to provide comfort and dry feeling contact with the surface of the body while allowing free passage of the fluids therethrough to the absorbent element. The protective barrier is intended to prevent the fluids that are expelled or that escape from the absorbent element from staining the garments of the users. The disposable absorbent articles are normally intended to be applied to the panty, and typically fixed to it by an adhesive, before using the panty with the applied absorbent article. The shape of the disposable absorbent articles, as seen in the plan view, have developed from a substantially rectangular, traditional shape, to anatomical shapes having widths that are not constant along the length of the article and that they are intended to cover additional body areas as compared to a traditional rectangular product having a width corresponding to the minimum width of an article formed. The anatomically formed articles provide a better comfort to the user admitting that their shape conforms better to the anatomy of the user, and that at the same time more closely follows the shape and contour of the panty in the crotch region, where the items, thus ensuring increased protection for the garment. The very common anatomical shapes for disposable absorbent articles are those in which the article has a minimum width in its central portion, and is larger in its front portion and / or in its posterior portion. The portions of the article that extend laterally in the front portion and / or in the rear portion beyond this minimum width allow the longitudinal edges of the absorbent article to coincide with the contour of the panty in the crotch region. These disposable absorbent articles, anatomically formed, usually have an absorbent core with longitudinal, parallel, straight edges. The topsheet and the backsheet extend beyond the absorbent core into the portions of the absorbent article that are wider than the minimum width, and there form lobes or ears of the article. Disposable absorbent articles are typically applied to the wearer's garment in a substantially flat configuration, by "substantially flat" being understood to be substantially free of folds or wrinkles. During use, the article of shape and fold under the forces exerted by the user's body and by the garment, and a certain degree of deformation is actually accepted and preferred, since this causes the absorbent article to conform to the body of the user, thus providing better comfort and protection. A disadvantage that has been experienced with anatomically formed absorbent articles comprising lobes or ears is due to possible bending of the lobes during use, which can cause the formation of permanent bends, generally resulting in a reduction of the useful surface of the article. same. The amount of bending may vary from a few degrees, relative to the initial substantially flat configuration, to complete bending of a part of a lobe, or also of the entire lobe, above or below the product. Various types of bends are possible, such as, for example, bends in the form of C-, Z-, S-, or W-. The occurrence of this bending in the lobes of the anatomically formed absorbent articles can in fact be promoted by the longitudinal edges of the absorbent core in which these can constitute a type of preferential bending line for the lobes, since the article has, as along these edges, a change in the thickness and therefore in the rigidity and resilience. On the other hand, the general low thickness of the article can make this easier by completely folding the lobes above or below the article itself. This problem is less evident in traditional anatomically formed absorbent articles, where the intrinsic resilience of the materials constituting the lobes can be prevented, at least to a certain extent, by the formation of permanent folds, even after it has taken place. a certain degree of bending, for example, helping to unfold the folded portions. However, the problem of permanent folds formation in the lobes has become more evident in anatomically formed disposable absorbent articles provided with improved backsheets comprising at least two layers laminated or otherwise joined together to form a Unitary structure that has specific properties. The multilayer backsheets that are particularly preferred in the disposable absorbent articles are those that provide breathability. The provision of breathable products has been considered a means to provide the consumer comfort benefits of absorbent articles. Respirability has typically focused on the incorporation of so-called "breathable backsheets" in absorbent articles. The breathable backsheets are permeable to water vapor, preferably permeable to air, allowing gaseous exchange with the environment. This thus allows the evaporation of a part of the fluid stored inside the core and increases the circulation of air within the absorbent article. The latter is particularly beneficial since it reduces the sticky feeling experienced by many users during use, commonly associated with the presence of a film formed with openings or a film-like upper, particularly for extended periods of time. This is a result of the upper sheets designed to achieve a clean and dry appearance. These upper sheets tend to be uniform, thus minimizing the agglomeration of the fluid on the surface of the upper sheet. However, these benefits are obtained at the expense of comfort, particularly under conditions of heat and humidity, when due to their smooth surface texture they tend to be sticky to the skin. However, the main disadvantage associated with the use of breathable backsheets in the absorbent articles is the negative effect on the operation of the protection level, for leaks known as rewet over the users' garments. Although, the respirable posterior sheets in principle only allow the transfer of materials in the gaseous state, physical mechanisms such as extrusion, diffusion and capillary action may still occur and result in the transfer of the absorbent core fluids through the backsheet and over the users' garments. In particular, these mechanisms become more dominant if the product is used during physical exercise, or by heavy discharge charges or for extended periods of time. Therefore, although the incorporation of the breathable backsheets in the absorbent articles is highly desirable from a comfort point of view, since the main role of a backsheet still remains in preventing the runoff of the liquid, it is necessary that these sheets Subsequent respirables are also impervious to fluid in order to avoid the risk of rewetting. The double-layer breathable backsheets such as those described, for example, in international patent applications WO 96/14037, WO 97/24095, WO 97/24096 and European patent application EP 96830343.8 are particularly effective in providing both breathability and impermeability to the fluid against the risk of rewetting. These are particularly suitable for incorporation into thin products such as pantyhose or thin sanitary napkins. Preferred structures for these double-layer breathable backsheets typically comprise a gas-permeable, three-dimensional, apertured polymeric film, typically as the inner layer, i.e., closest to the absorbent core, adhered to or in any case associated with an outer layer constituted by the gas-permeable fibrous fabric layer, or, alternatively, by a microporous, gas-permeable polymeric layer. These double-layer backsheets have shown very good behavior in terms of breathability and rewet control, and constitute a structure that is still thin and flexible but, recognizing its relative complexity, is less elastic and can increase the possibility of formation of permanent folds in the lobes in the anatomically shaped breathable products during use. The three-dimensional structure of the three-dimensional apertured polymeric film, for example, can be broken during bending and this can induce permanent or almost permanent bending in the lobes of the sanitary article formed during use. The disadvantages of bending the lobe with the formation of permanent folds in disposable absorbent articles, anatomically formed, are mainly due to the decrease in the operation of absorption and protection of the product caused by the reduction of effective surface area of the product, and also to the negative perception of the quality of the product and the operation by the user when he comes to know, usually at the moment he removes the article of clothing, in which the article itself has lost, up to a certain limit, your optimal initial configuration. The bent lobes can, on the other hand, induce a comfort problem for the user during the use of the article, since these constitute zones where the article is thicker and possibly more rigid. It is therefore an object of the present invention to provide an anatomically formed disposable absorbent article having a reduced tendency to form permanent bends in the lobes during use, i.e., having a better ability to recover its initial configuration unfolded after bending .

It is a further object of the present invention to provide said article with a reduced tendency to form permanent bends in the lobes, which is also respirable. It has, in fact, been discovered that by controlling the bond between the superposed layers constituting the disposable absorbent article formed in the area of the lobe it is possible to reduce the tendency of the formed article to form permanent bends in the lobes during use.

BRIEF DESCRIPTION OF THE INVENTION The present invention relates to a disposable absorbent article formed having a front end portion and a rear end portion, and a periphery. The disposable absorbent article formed is formed by overlaying layers comprising a liquid-permeable topsheet, a backsheet comprising at least two plies and which are attached to the topsheet at least along the periphery, and an absorbent core intermediate to the plies. top sheet and backsheet, and having at least one lobe in at least one of the front end portion or the back end portion, the lobe being provided within the periphery by the top sheet and the back sheet in a region where the top sheet and the back sheet extend beyond the absorbent core. The disposable absorbent article formed has a binding ratio in at least one lobe defined as the ratio that has as the numerator the number of overlapping layers that are directly joined to at least one adjacent layer in at least one different lobe throughout from the periphery, and as the denominator the total number of overlapping layers in at least one lobe. The binding ratio has a value that is less than or equal to 0.5.

BRIEF DESCRIPTION OF THE DRAWINGS Although the description concludes with the claims pointing out in a partic manner and claiming the present invention differently, it is believed that the present invention will be better understood from the following description in combination with the accompanying drawings: Figure 1 is a view in plan of a pantiprotector according to the present invention, seen from the side thereof that gives the user during use; Figure 2 is a cross-sectional view of the panty-protector of Figure 1 on line 2-2; Figure 3 is an enlarged cross-sectional view of a back sheet comprised in the pantiprotector of the present invention, taken along line 2-2 of Figure 1.

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to anatomically shaped disposable absorbent articles for application to the wearer's body, which exhibit absorbency to body fluids, protection of the wearer's garments against staining, and improved physical comfort for the wearer. As used herein, the term "absorbent article" refers to devices that absorb and contain exudates from the body, and, more specifically refers to devices that are placed against or close to the user's body to absorb and contain the various Exudates charged from the body. The term "disposable" is used herein to describe absorbent articles that are not intended to be washed or restored or reused in another way as an absorbent article (ie, they are intended to be discarded after a single use and , preferably, to be recycled, composted or otherwise disposed of in an environmentally compatible manner). A preferred embodiment of an absorbent article of the present invention is the pantiprotector 20 shown in Figure 1. As used herein, the terms "pantiprotector" and "sanitary napkin" refer to the absorbent articles generally worn by women adjacent to the pudendal region that are intended to absorb and contain the various exudates that are discharged from the body (for example, vaginal discharge, blood, menstruation, and urine). The present invention, however, is not limited to the particular types or configurations of the absorbent articles shown in the drawings. It should be understood that the present invention is also applicable to other anatomically shaped disposable absorbent articles such as incontinence pads and the like. The term "use", as used herein, refers to the period of time that begins when the absorbent article is actually brought into contact with the user's anatomy. The terms "attached", "fixed" or "insured", as used herein encompass configurations by means of which a first member is directly connected to a second member and configurations by which a first member is indirectly connected to a second member. connecting the first member to intermediate members, which in turn connect to the second member. As used herein, the term "pudendal" refers to the externally visible female genital organs and is limited to the labia majora, the labia minora, the clitoris, and the vestibule. As shown in Figures 1 and 2, the pantiprotector 20 comprises an absorbent means represented by the main body portion 22. The main body portion 22 has longitudinal edges 24 and side edges 26, together constituting the periphery 28. The term " "longitudinal", as used herein, refers to a line, axis or direction in the plane of the pantiprotector 20 that is generally aligned with (eg, approximately parallel to) a vertical plane that divides a wearer standing in body halves left and right when wearing the pantiprotector 20. The term "lateral" as used herein, refers to a line, axis or direction that is located within the plane of the pantiprotector 20 that is generally perpendicular to the longitudinal direction. The terms "front" and "posterior", as used herein, refer to portions or edges on the sanitary napkin 20 that are oriented toward the front and the back of the wearer's body, respectively, when it is being used. The sanitary napkin 20 is used. The main body portion 22 has a front end portion 10 and a rear end portion 12. The panty protector 20 has concave longitudinal edges 24 to fit the contour of the wearer's pantyhose and is therefore larger in both of its front and rear end portions 10 and 12. In the embodiment of the present invention shown in Figure 1, the panty protector 20 is symmetrical both in the longitudinal direction and in the lateral direction, and therefore the front end portion 10 has substantially the same structure and shape as the rear end portion 12. The main body portion 22 comprises an upper sheet 30, a a multilayer backsheet 50, and an absorbent core 60. The main body portion 22 also comprises a secondary nonwoven layer 40. The topsheet 30 is permeable to liquid and when the panty protector 20 is in use, the topsheet 30 It is docile, soft feeling and non-irritating to the user's skin. The upper sheet 30 has a central zone 32 and a pair of end zones 34. The end zones 34 extend laterally from and are contiguous with the central zone 32.

The topsheet 30 comprises an outer nonwoven layer 70 and a thermoplastic film layer with openings 80. The nonwoven outer layer 70 is liquid permeable and has an opening 72 placed in the central zone 32. The opening 72 is provided in the nonwoven outer layer 30 as a passage for body exudates to be deposited directly on the thermoplastic film layer with openings 80 to take advantage of its superior fluid handling properties such that the fluid will rapidly pass to the absorbent core . In a preferred embodiment, the nonwoven outer layer 70 comprises two strips 74, 76. The two strips 74, 76 of the nonwoven outer layer 70 are separated at the top of the thermoplastic film layer with openings 80 such that the regions separated between the two strips 74, 76 form the opening 72. In this particular embodiment, each strip 74, 76 has approximately parallel internal edges 74a, 76a which are further apart from the side edge 26 to the other side edge 26 whereby the opening 72 has a substally rectangular shape elongated in the longitudinal direction. While the opening 72 in the center (longitudinally) of the central zone 32 is large enough to allow the flow of bodily fluids attempted to be absorbed by the core, these longitudinal ends of the central zone 32 may be covered with the layer nonwoven outer 70 or a separate layer (not shown). The non-woven outer layer 70 extends laterally toward the seam 29 around the periphery 28 of the main body portion 22. In the embodiment illustrated in FIGS. 1 and 2, the seam 29 joins the non-woven outer layer 70 together, to the apertured thermoplastic film layer 80, to the non-woven secondary layer 40 and to the multilayer backsheet 50 by a known securing means, for example, by pleating, gluing, thermal bonding, or any combination thereof. The preferred parotector 20 has concave longitudinal edges 24 for adjusting to the contour of the wearer's pas. In a preferred embodiment, the non-woven outer layer 70 has a width of at least about 1.5 mm in both end regions in the narrowest portion and of approximately at least 7 to 10 mm in the widest portion. The width of the opening will depend on the intended use of the article. For low flow painers, the width of the opening is greater than about 5 mm, preferably about 10 to 30 mm, preferably greater than about 20 mm. For the most copious flow sanitary napkins, the width of the opening is greater than about 10 mm, preferably about 20 to 60 mm, more preferably about 40 mm. The ratio of the width of the opening 72 to the total lateral width of the main body portion may vary based on the total width of the nonwoven outer layer 70, and of course this may also vary along the length of an absorbent article. anatomically formed such as the parotector 20 of the present inven. The ratio is preferably from about 4: 1 to about 1: 4, more preferably from about 2: 1 to 1: 2. It has been found that these shapes and area for opening 72 are desirable from a product, process, and aesthetic standpoint. However, other shapes and various areas are possible in the design of the aperture 72. For example, each strip 74, 76 may have an internal, non-parallel edge, or it may be on or in either of both longitudinal edges 26 to define a circular opening. While the opening 72 is large enough to allow the passage of most of the fluids deposited on the upper sheet in the opening to pass, the particular arrangement or configuration of the opening is not critical. The non-woven outer layer 70 is preferably secured in at least partial contact relationship with the apertured thermoplastic film layer 80. The non-woven outer layer 70 can be maintained in contact with the thermoplastic film layer with aperture 80 by bonding by fusion, adhesive fixing of the layers, or any other means of securing. The attachment of the non-woven outer layer 70 to the apertured thermoplastic film layer 80 can prevent the outer non-woven layer from being torn or wound back on itself at the edges 74a, 76a, thus signifying an uncomfortable feeling. Fusion bonds include thermal bonding, ultrasonic bonding, and the like. Thermal bonding is the preferred means for securing the non-woven outer layer 70 and the thermoplastic film layer with opening 80 in contacting relationship. The two layers can be joined together in a continuous, partial or intermittent manner. In a preferred embodiment, the non-woven outer layer 70 and the thermoplastic film layer with openings 80 are joined at points in a plurality of positions along the inner edge 74a, 76a of each strip 74, 76 with thermal joints 78. thermal bonds 78 provide a raised seal pattern that can also lead to an aesthetic effect on your pattern design such as a flower, a leaf and so on, etc. The non-woven outer layer 70 provides softness in the end areas of the top sheet in order to eliminate any of the problems of a sticky, wet feel for the user as well as a member that can efficiently handle any of the deposited liquids. on the end areas. The non-woven outer layer 70 comprises a nonwoven web having excellent flexibility, docility and fluid acquisition. A material suitable for use as the nonwoven outer layer 70 of the topsheet comprises blends of polyethylene (the melting point of which is at a relatively low temperature), polypropylene, and / or polyester, known in the art as "weft". two components. " A web adjacent to a surface of the non-woven web comprises mainly two-component fibers (preferably 50/50 by weight) of polyethylene and polypropylene. A layer adjacent to the other surface mainly comprises two-component fibers (also preferably 50/50 by weight) of polyethylene and polyester. Nonwoven webs comprising polyethylene containing fibers are particularly suitable for use in the present invention because they are easily melt bonded. The fusion bond between the non-woven web and the apertured thermoplastic film layer 80 is made by melting the polyethylene in the fibers. Both of the above layers contain the polyethylene in the fibers in such a way that any layer can be arranged to face the thermoplastic film layer with apertures 80 by fusion bonding. Preferably, the nonwoven web layer comprising the polyethylene and polyester bicomponent fibers is arranged to face towards the apertured thermoplastic film layer 80. In this preferred arrangement, the nonwoven web layer comprising the fibers Two-component polyethylene and polypropylene is arranged to give the user, and provides superior softness, flexibility and flexibility due to the character of the polypropylene. In addition, the nonwoven web layer comprising the two-component polyethylene and polyester fibers performs a cushioning function. Exemplary nonwoven webs that can be used as the nonwoven outer layer 70 are available from Pantex, Italy, under the designation TB-B-23. The non-woven outer layer may also have a flat surface or a raised pattern as designed by the article's manufacturer. Any type of suitable two component webs can also be used as the outer non-woven layer 70. The apertured thermoplastic film layer 80 is permeable to liquid and is placed below the outer non-woven layer 70 and is closer to the core absorbent 60. The thermoplastic film layer with openings 80 and the nonwoven outer layer both cover the end areas 34. In addition, the apertured thermoplastic film layer 80 is exposed through the rectangular opening 72 of the nonwoven outer layer 70 in the central zone 32 from the side edge 26 to the other side edge 26. Although the thermoplastic film layer with openings 80 does not need to extend to the lateral or longitudinal edges of the main body portion, in a preferred embodiment as shown in FIGS. 1 and 2, the apertured thermoplastic film layer 80 extends laterally and longitudinally outwardly and forms a part thereof. of the longitudinal edges 24 and the side edges 26 or the periphery 28. The formed films are preferred for the apertured thermoplastic film layer because they are permeable to liquids and not yet absorbent. In this way, the surface of the formed film that is in contact with the body remains dry and is more comfortable for the user. Films formed suitable for apertured thermoplastic film are described in U.S. Patent No. 3,929,135, entitled "Absorption structure having tapered capillaries", issued to Thompson on December 30, 1975; U.S. Patent No. 4,324,426, entitled "Disposable absorbent article having a top sheet resistant to stains"; issued to Mullane and Smith on April 13, 1982; US Pat. No. 4,342,314, entitled "Elastic plastic weave exhibiting fiber-like properties", which was issued to Radel and Thompson on August 3, 1982, and US Pat. No. 4,463,045, entitled "Plastic weft. macroscopically expanded three-dimensional that exhibits a non-glossy visible surface and a "fabric-like" touch impression, issued to Ahr, Louis, Mullane and Ouellette on July 31, 1984. A formed film that has been found to be satisfactory is manufactured by Tredegar Industries, Inc. of Terre Haute, Indiana under the designation X3265, and which is marketed as "Dri-Weave" in sanitary napkins produced by The Procter & Gamble Company of Cincinnati, Ohio. In addition, in a preferred embodiment of the present invention, at least a portion of the outer surface 80a (body-facing surface) of the apertured thermoplastic film layer 80 is treated with a surfactant. It is preferred that the surfactant be distributed in a substantially uniform and complete manner at least in the central zone 32 of the outer surface 80 of the apertured thermoplastic film layer 80. This can be accomplished by any of the common techniques well known in the art. those skilled in the art. For example, the surfactant can be applied to the thermoplastic film layer with apertures 80 by spray, per pad, or by the use of transfer rolls. The treatment of the outer surface 80a of the thermoplastic film layer with openings 80 as the surfactant towards the surface of the thermoplastic film layer 80 with more hydrophilic openings. This results in faster liquid penetration of the thermoplastic film layer with openings 80 that would be if the surface were not treated as such. This decreases the likelihood that bodily fluids will flow out of the thermoplastic film layer with apertures 80 instead of being absorbed by the absorbent core 60. In a particularly preferred embodiment, an additional nonwoven secondary layer 40 is placed between the absorbent core. 60 and the apertured thermoplastic film layer 80. The non-woven secondary layer 40 prevents "bulging", i.e. torsion of the pantiprotector per se, or of the absorbent core in the crotch portion whose twisting can cause leakage exudates from the body, and provides additional softness at the periphery 28 of the main body portion. The inner surface 80b of the apertured thermoplastic film layer 80 is preferably secured in contact with the secondary nonwoven layer 40 by means of, for example, a layer of adhesive 81. This contacting ratio results in the penetration of the liquid. faster than the thermoplastic film layer with openings 80 that if the thermoplastic layer with openings 80 is not in contact with the secondary nonwoven layer 40. The thermoplastic film layer with openings 80 can be kept in contact with the secondary nonwoven layer 40 by, for example, heat sealing as described hereinbefore, or by applying adhesive to the inner surface 80b of the apertured thermoplastic film layer 80. Preferably, the contacting ratio is applied by the same type of securing means as those between the non-woven outer layer 70 and the apertured thermoplastic layer 80, more preferably, the same a ion by points and sealing with heat. The non-woven secondary layer 40 is liquid permeable and is placed between the thermoplastic film layer with apertures 80 and the absorbent core 60. In a particular embodiment, the secondary non-woven layer 40 is extended laterally and longitudinally outwardly and forms a part thereof. of the longitudinal edges 24 and of the side edges 26 of the periphery 28. The material of the non-woven secondary layer 40 can be the same as the non-woven outer layer 70. Preferably, the surface of the nonwoven web comprising the mixture of the polyethylene and polyester fibers is arranged to face towards the thermoplastic film layer with openings 80 by assurance by fusion bonding in contacting relationship. In this particular embodiment, the surface 40b of the secondary non-woven layer 40 that gives the absorbent core 60 is secured in contact relation with the absorbent core 60. The contacting ratio can be obtained by the same securing means described above to maintain the contact ratio between the thermoplastic film layer with apertures 80 and the secondary nonwoven layer 40. Preferably, the contact ratio is achieved by applying an adhesive 41 to give between the secondary non-woven layer 40 and the absorbent core 60. The adhesives suitable for this purpose are described in U.S. Patent No. 4,917,697. The adhesives can be applied by the same methods as described above for the surfactant applied to the outer surface 80a of the apertured thermoplastic film layer 80. The absorbent core 60 can be secured to the secondary nonwoven layer 40 by a layer of uniform adhesive, a patterned adhesive layer, or an array of separate lines, spirals or spots of adhesive. An exemplary adhesive is manufactured by Findley Adhesives Company of Wauwatosa, Wisconsin and designated as H-2128. The securing means between the thermoplastic film layer with openings 80 and the secondary nonwoven layer 40 will preferably comprise a network of open-pattern adhesive filaments as disclosed in U.S. Patent No. 4,573,986 entitled "Disposable Garment of Restraint. of negligence, issued to Minetola and Tucker on March 4, 1986. An exemplary securing means of a network of adhesive filaments twisted in a spiral pattern as illustrated by the apparatus and methods shown in the United States patent. No. 3,911, 173 issued to Sprague, Jr on October 7, 1975; U.S. Patent No. 4,785,996 issued to Ziecker et al. on November 22, 1978; and in U.S. Patent No. 4,842,666 issued to Werenicz on June 27, 1989. The absorbent core 60 is positioned between the topsheet 30 and the multilayer backsheet 50. In a preferred embodiment of the present invention shown in Figures 1 and 2, the absorbent core 60 has rectilinear longitudinal edges 66 parallel to each other, and has a width that is slightly narrower than the minimum width of the panty protector 20, such that the seam 29 along the length of the periphery 28 of the pantiprotector 20, wherein the topsheet 30, the multilayer backsheet 50 and the non-woven secondary layer 40 are joined together, does not comprise the absorbent core 60 anywhere. The panty-protector 20 has two lobes 82 in the portion of front end 10 and two lobes in the rear end portion 12, which correspond to the regions of the pantiprotector 20, comprised within the periphery 28, where at least the sheet exceeds 30 and the multilayer backsheet 50 and, in the embodiment shown in FIGS. 1 and 2, also the secondary non-woven layer 40, extend beyond the longitudinal edges 66 of the absorbent core 60. The absorbent core 60 provides the medium to absorb body fluids. The absorbent core 60 does not need to have an absorbent capacity much greater than the total amount of anticipated body fluid that is absorbed. The total absorbent capacity of the absorbent core normally comes to be compatible with the design load and intended use of the absorbent article. In addition, the size and absorbent capacity of the absorbent core can be varied to suit different uses. A pantiprotector such as that illustrated in Figures 1 and 2, for example, will generally have smaller dimensions, and will comprise an absorbent core 60 with a lower absorbent capacity, as compared to a sanitary napkin. The absorbent core 60 is generally compressible, capable of shaping, and not irritating the skin of users. This may comprise any material used in the art for such purpose, examples include ground wood pulp which is generally referred to as air filter, creped cellulose wadding, absorbent foams, absorbent sponges, synthetic staple fibers, polymer fibers, forming polymers of hydrogel, gelling absorbent materials, peat moss, or any equivalent material or combinations of materials. An exemplary absorbent core is a tissue layer as manufactured by Ft. Howard and designated as grade 882. The absorbent core may also have a layer of gelling absorbent material, such as in the particulate form, disposed between two layers of absorbent material. tissue placed by air (or "upper" and "lower" tissue layers) - The first and second tissue layers provide the containment of the gelling absorbent material, the improved lateral wicking effect of the absorbed exudates throughout the absorbent core, of a degree of absorbency. Exemplary absorbent structures for use as the absorbent core of the present invention are described in U.S. Patent No. 4,950,264 entitled "Thin, flexible sanitary towel" issued to Osborn on August 21, 1990; U.S. Patent No. 4,610,678 entitled "High Density Absorbing Structures" issued to Weisman et al. on September 9, 1986; U.S. Patent No. 4,834,735 entitled "High density absorbent members having lower density and lower basis weight acquisition zones" issued to Alemany et al. on May 30, 1989; and European Patent Application No. 0198 683, Procter & Gamble Company, published on October 22, 1986 in the name of Duenk and others. The gelling absorbent materials mentioned above are those materials that, upon contact with fluids (ie, liquids) such as water or body fluids, will imbibe said fluids and thus form hydrogels. In this manner the fluids discharged into the absorbent core 60 can be acquired and maintained by the gelling absorbent materials, thereby providing articles with enhanced absorbent capacity and / or enhanced fluid retention performance. The preferred gelling absorbent materials that are employed within the absorbent core 60 will generally comprise particles of a hydrogel-forming polymer, substantially insoluble in water, slightly cross-linked, preferably neutralized. The term "particles", as used herein, can refer to particles in any form, such as in the form of flakes, pellets or fibers. The characteristics of the absorbent core 60 (including, but not limited to, the types of preferred polymer materials used herein, and the types of methods that can be used to prepare these polymer particles) are described in greater detail in the US Pat. United No. 5,009,653 issued to Osborn. The absorbent article of the present invention may further comprise, for example, in the absorbent core 60, an odor control material for controlling unpleasant odors associated with absorbed body fluids. Any known odor control agent or any combination thereof that may be suitable included in a disposable absorbent article, including other materials such as binders and / or substrates, may be comprised within the absorbent article of the present invention as the control material of the smell.

The odor control material can be incorporated into the absorbent article by means known in the art, for example in layers, or in an absorbent or mixed core within an absorbent core. An exemplary structure of the laminated absorbent core comprising a layer of gelling absorbent material and an odor control material is that made by Korma, Italy, under the designation KO 040.02.003. The absorbent articles according to the present invention comprise a multilayer backsheet 50 which is impervious to liquids (e.g., vaginal discharges, menses, and / or urine) and is constituted by at least two distinct layers laminated or bonded together. another way together in order to provide a backsheet structure having specific preferred properties. A multilayer backsheet comprising, for example, a laminated nonwoven layer or a layer of polymeric film, with the nonwoven material typically located on the garment facing side of the backsheet, would provide an absorbent article. disposable with a more friendly and softer external surface. The multilayer backsheets that are particularly preferred in the disposable absorbent articles according to the present invention, such as the panty protector 20 illustrated in FIGS. 1 and 2, are those that provide breathability. The preferred multi-layer breathable backsheets, more particularly the double-layer breathable backsheets, are those described in international patent applications WO 97/24095, WO 97/24096 and European patent application EP 96830343.8. In a preferred embodiment of the present invention, the pantiprotector 20 comprises a breathable backsheet of multiple layers of fluid transfer in a direction 50. The primary role of the backsheet is to prevent the exudates absorbed and contained in the absorbent structures from wetting the articles that are in contact with the absorbent product such as underpants, briefs, pajamas and undergarments. However, in addition, the preferred multilayer backsheet of the absorbent article of the present invention also allows for the transfer of vapor and air through it and thus allows the circulation of air in and out of the backsheet . The term "in one direction" as used herein refers to materials that have at least one directional fluid transport substantially, if not complete, in the direction of the core, according to the definition of the directional capacity of the given fluid. in the aforementioned international patent application No. WO 97/24095. In a preferred embodiment of the present invention, the multilayer breathable backsheet 50, illustrated in greater detail in Figure 3, preferably comprises at least two layers; a first layer 52 comprising a polymeric film with gas permeable openings and a second layer 54 comprising a microporous gas permeable film, or alternatively, a fibrous gas permeable fiber layer. Suitable gas permeable layers can generally include two-dimensional, flat micro and macro porous films, macroscopically expanded films, films with formed openings and monolithic films such as those described in the aforementioned three European patent applications. Said first and second layers 52, 54 preferably have a similar relative hollow volume. The first layer 52 is typically located adjacent the core 60 and subsequent layers of the backsheet 50 are typically located further away from the core 60. The backsheet 50 may comprise additional layers. In all cases, the outermost surface furthest from the core is the outer layer. All of the layers of the backsheet 50 can be substantially in intimate and direct contact with each other.

The first apertured layer 52 of the backsheet 50 comprises a layer having discrete apertures 56, which extend beyond the horizontal plane of the surface that gives the garment of the layer towards the core thereby forming a bulge 58. Each protrusion has a hole located at its terminal end. Preferably said openings have a funnel or conical shape, similar those described in U.S. Patent No. 3,929,135. The openings located within the plane of the layer and the holes located at the terminal end of the protuberances themselves can be circular or non-circular. In any case, the dimension or cross-sectional area of the hole at the termination of the protuberances is smaller than the dimension or cross-sectional area of the opening located within the plane of the layer. Preferably, said apertured films are unidirectional such that they are at least substantially, if not complete, a fluid transport in a direction toward the core. The first layer 52 of the backsheet 50 typically has an open area greater than 5%, preferably from 10% to 35% of the total area of the film layer, according to the definition given in the aforementioned WO International Patent Application. 97/24095. The first layer 52 of the backsheet 50 can be made of any material known in the art, preferably made from commonly available polymeric materials. A film formed with suitable apertures includes, for example, the material manufactured by Tredegar Industries, Inc. of Terre Haute, Indiana under the designation S225MD25. The second layer 54 of the multilayer backsheet 50 comprises a substantially flat, two-dimensional, permeable gas-permeable layer. As used herein, the term "substantially flat two-dimensional" refers to the layers having a depth of less than 1 mm, preferably less than 0.5 mm, wherein the openings are all within the plane of the layer. Thus, as used herein the term "two-dimensional layer" does not include preformed films with openings having openings protruding from the plane of the layer. According to the present invention, the openings in said two-dimensional layer can be of any configuration, but are preferably circular or oblong. The openings can also be of variable dimensions. Typically, the openings have average diameters of 150 micrometers to 5 micrometers, preferably 120 micrometers to 5 micrometers, most preferably 90 micrometers to 5 micrometers. Preferably, the total surface of the two-dimensional layer has openings that are evenly distributed over the entire total surface area. However, layers having only certain regions of the surface area comprising openings such as the central portion or the peripheral portion are also possible. The two-dimensional apertured layer of the second layer 54 of the backsheet 50 can be made of any material known in the art, but preferably made from commonly available polymeric materials such as polyethylene or polypropylene. Suitable microporous material includes XMP-1001 from Minnesota Mining and Manufacturing Company, of St. Paul, Minnesota, USA and XBF-100W or XBF112 available from Exxon Chemicals, Illinois, USA. Suitable materials are, for example, Goretex or Sympatex type materials well known in the art for that application in breathable so-called garments. Materials with openings for use as a second layer 54 in backsheet 50 can be produced using any of the methods known in the art such as described in European Patent EP 293 482 and references herein. In addition, the dimensions of the openings produced by this method can be increased by applying a force through the plane of the backsheet layer (i.e., stretching the layer).

The second layer 54 of the backsheet 50 incorporated in the panty protector 20 of the present invention may alternately comprise a layer of air permeable fibrous fabric composed of polymeric fibers such as the polymeric nonwoven materials known in the art. The fibrous fiber layer preferably has a basis weight of 10 to 100 g / m2, more preferably 15 to 30 g / m2. The fibers can be made of any polymeric material, in particular, the fibers of polyethylene, polypropylene, polyester, polyacetate, or combinations thereof (combinations of inter and intra fiber) and also blends of synthetic fibers and non-absorbent natural fibers or fibers treated naturals such as cotton that can be used. The fibers are preferably spun bonded, carded or blown in the molten state. Preferably the second layer 54 comprises a matrix of spunbonded fibers covered on one side with meltblown fibers or alternatively a matrix of meltblown fibers covered on both sides with blown fibers. The second layer 54 of the backsheet 50 may further comprise at least 5% by weight of said fiber layer which are liquid absorbers such that the fibers swell and reduce the space between the fibers. The backsheet typically extends through the entire absorbent structure. The elements of the topsheet, the backsheet and the absorbent core are joined together to provide the pantiprotector 20 of the present invention. At least two, preferably all the elements of the pantiprotector 20 are attached. Each of said elements comprising at least one layer has a surface facing the body and a surface that gives the garment. Typically, adjacent garment facing surfaces form a common interface with the surface that faces the body of an adjacent layer or element. The elements or layers are joined together through their common interface. In this manner, the topsheet 30 is attached to the absorbent core 60 as already explained, and which comprises the secondary nonwoven layer 40 therebetween, and the core 60 is attached to the backsheet 50. In addition, each of the elements of the upper sheet 30, the back sheet 50 and the core 60 may comprise more than one layer and these layers may be similarly joined. In addition, the topsheet 30 is directly or indirectly attached to the backsheet 50 at the periphery 28 of the panty protector 20 by means of the seam 29. The elements and layers thereof can be joined by any means known in the art to fix two layers of adjacent material, such that the layers are directly joined one to another or directly joined to one another through the joining means. Suitable bonding means include adhesive, melt bonding, ultrasonic bonding, fusing, heat (e.g., pleating), embossing, and / or pressure bonding, or dynamic mechanical bonds. According to one embodiment of the present invention, the preferred joining means is the adhesive. Suitable adhesives include cold and non-pressure sensitive adhesives. The adhesive can be applied by any means known in the art such as spiral application, slot coating, spray, spiral spray, curtain coating, coating and control printing, as long as the adhesive does not substantially affect the breathability . In the preferably breathable pantiprotector 20 of the present invention, the inter-element or inter-layer joining the adhesive is selected and applied to reduce any impact this may have on the effective breathability of the pantiprotector. Since many of the commonly used adhesives are not vapor permeable, it is highly preferable to reduce the amount of adhesive used to bond the layers / element of the absorbent article in order to minimize its impact on permeability (respirability). One means of achieving this is to use particular adhesive application methods such as open adhesive application techniques, for example, spiral spray, whereby the areas of the common interface are free of adhesive, while retaining the required level of attachment / bonding of the two adjacent layers or elements. The layers and the elements must, therefore, be joined in such a way, in such a way that the product of the absorbent article maintains the structural integrity but no more. This method finds particular application for the joining of the interlayers of the layers of the backsheet element and the joining of the backsheet element and the absorbent core element. In the embodiment of the present invention illustrated in Figure 1, the adhesive layer 61 links the absorbent core 60 to the first layer 52 of the double-layer backsheet 50, and an adhesive layer 61 joins the first layer together 52 and to the second layer 54 of the double-layer backsheet 50. In general, the adhesive layers consisting of an array of separate longitudinal lines or drops of adhesive are particularly preferred in the disposable absorbent article of the present invention since this achieves a low integration between the elements forming the article, which minimizes the impact on breathability and at the same time also provides less rigidity and better resilience of the total article in the transverse direction. Alternatively, adhesives that are vapor permeable can be used. Preferably not more than 40%, more preferably less than 20%, most preferably 10% of the common interface of the two adjacent layers or elements which is attached. In addition, the density of the adhesive must be reduced and a thin adhesive application is preferred. In a preferred embodiment of the present invention wherein the absorbent article finds utility as a pantiprotector, the absorbent article is also provided with a panty fastening means, which provides the means for securing the article to an undergarment. For example, the fastening means of the panty may comprise a mechanical fastener such as the hook and curl fasteners as sold under the trade name VELCRO, tweezers or fasteners. Alternately, the article fastened to the undergarment by means of the panty fastening adhesive 90 on the backsheet 50. The panty fastening adhesive 90 provides a means for securing the article to the panty and preferably a means for securing the article. the article when it gets dirty, for the folded and wrapped packing for convenient disposal. Typically, at least a portion of the garment facing surface of the backsheet 50 is coated with adhesive to form the fastening adhesive of the panty 90. Any adhesive or glue used in the art can be used for such purposes for the fastening adhesive of the present pantyhose. Pressure sensitive adhesives are more preferred. Suitable adhesives include Century A-305-IV manufactured by Century Adhesives Corporation of Columbus, Ohio, and Instant LOK 34-2823 manufactured by National Starch and Chemical Company of Bridgewater, New Jersey, 3 Sigma 3153 manufactured by 3 Sigma and Fuller H -2238ZP manufactured by HB Fuller Co. The fastening adhesive of the panty 90 is typically applied to the backsheet 50 by the groove coating. In order to reduce the effect on breathability of the preferred backsheet 50 and thus the article as a whole, the adhesive is preferably applied in such a way that at least 60%, preferably at least 80%, most preferably at least 90% of the surface of the backsheet 50 is free of adhesive. The required adhesiveness can still be achieved even when the reduced surface cover is used by using a particular distribution such as thinner strips, discontinuous strips of adhesive, intermittent points, spirals with random patterns. The fastening adhesive of the panty 90 is typically covered with a removable paper or film capable of being removed 92 in order to prevent the adhesive from drying or adhering to a different surface of the panty before being used. Any commercially available release paper or film can be used. Suitable examples include BL 30MG-A SILOX El / O and BL 30 MG-A SILOX 4 P / O available from Akrosil Corporation. In accordance with the present invention, it has been found that by controlling the area of the lobes 82, 84, the joining of the overlapping layers, comprising a multilayer backsheet 50, constituting the anatomically formed absorbent article 20, is possible to reduce the occurrence of the formation of permanent folds in the lobes during the use of the absorbent article. The structure of the multilayer backsheet 50, particularly the structure of the preferred double-layer breathable backsheet 50 incorporated in the preferred panty-protector 20 shown in Figs. 1 and 2, is in fact rather complex, comprising in a preferred embodiment a first layer 52 constituted by a film formed with three-dimensional openings joined by known means, as explained above to a second layer 54 constituted by a microporous film with two-dimensional openings. These composite and thin and flexible structures, but can, in the area of the lobes 82, 84, give rise to the permanent folds when bending occurs in the lobes during the use of the pantiprotector, recognizing the forces exerted on the pantiprotector by the body of the user and by the undergarment. The three-dimensional structure of the first layer 52 comprising the protrusions 58 can, in fact, break during bending and thus promote the formation of permanent bends in the area of the lobes 82 as 84. In accordance with the present invention, the Binding of the superposed layers constituting the absorbent article has to be controlled in the area of the lobes 82, 84 of the absorbent article of the present invention. Without being bound by any theory, it is believed in fact that the presence of the bonding means, for example, adhesive, between the layers in the area of the lobes, does not allow the layers characterized by a better resilience to contrast the tendency of layers less resilient to form permanent folds. On the contrary, the joining means promote the formation of permanent or semi-permanent bends in multi-layer structures when the doubling in use occurs, reducing the resilience of said structures. According to the present invention, a binding relationship can be defined; said binding relation is the relation that has as the numerator the number of layers superimposed on the lobes 82 as 84 which are directly attached to at least one other adjacent layer, and as the denominator the total number of layers superimposed on the lobes 82 as 84. The values of the bonding ratio can vary from 0, when there is no union at all between the overlapping layers in the area of the lobe 82, 84 different from along the periphery 28, up to 1, when each one of the superimposed layers in the lobe area is attached to at least one other adjacent layer, possibly with all the layers bonded together. The outermost layer on any of the surface that gives the garment or the surface that it gives to the body is more considered joined if it is not attached to the respective contiguous inner layer in the lobes. Differently, the layers between these two outermost layers do not have to be joined to both adjacent layers so as not to be counted in the numerator of the bonding relationship. It has been found that the occurrence of the formation of permanent bends in the lobes is reduced when the value of the bonding ratio is less than or equal to 0.5, preferably less than 0.2. In accordance with the present invention, it is also particularly preferred that the layers forming the multilayer backsheet 50 not be bonded together in the area of the lobes 82, 84, rather than along the periphery 28, where these are joined by the seam 29. The joining means between the layers of a multilayer backsheet, especially a breathable two-layer backsheet comprising a three-dimensional apertured formed film, such as that included in the preferred panty-protector. of the present invention, can cooperate in fact in this type of complex structure instead, by inducing the formation of permanent or semi-permanent bends during use in the area of the lobes 82, 84. When bending, the joining means is, fact, it is probable that it will stabilize a little the collapsed state of the deformed structure by understanding the film formed with three-dimensional openings constituting the first layer 52 of the h second breathable double layer 50 preferred. In the preferred embodiment illustrated in Figures 1 and 2, where a double-layer backsheet 50 is incorporated in a panty-protector 20, the first layer 52 and the second layer 54 of the backsheet 50 are not preferably joined together in the area of the lobes 82, 84. As best shown in Figure 2, the first layer 52 of the double-layer backsheet 50 is joined to the second layer 54 by means of a layer 51 of the adhesive that does not extend into the area of the lobes 82. The first layer 52 and the second layer 54 are joined along the periphery 28 by the seam 29, in such a way that it also joins the secondary nonwoven layer 40 and the layers 70, 80 of the upper sheet 30. In the preferred embodiment of the present invention illustrated in Figures 1 and 2, the value of the bonding ratio is 0, since, as best shown in Figure 2, none of the non-woven outer layer 70, thermoplastic film layer with openings 80, both constituents of the sheet upper 30, the non-woven secondary layer 40, and the first and second layers 52, 54 of the double-layer breathable backsheet 50 are bonded together to no other adjacent layer in the area of the lobes 82, 84. The middle of junction, for example, the heat bonds 78 and the adhesive layers 41, 81, 51 and 61 in fact do not extend laterally towards the area of the lobes 82 of the front end portion 10 of the panty protector 20, as shown in FIG. figure 2; the same applies in the area of the lobes 84 of the back end portion 12. All the superimposed layers constituting the panty protector 20 are joined together by means of the seam 29, achieved, for example, by pleating, only along the Periphery 28. The control of the bond between the layers in the lobes has the effect of increasing the resilience of the lobe in the anatomically formed disposable absorbent articles of the present invention. The lobe resilience as defined here, measures the capacity of the lobes of an absorbent article according to the present invention to be recovered from a bent configuration, ie, unfold, after it has been subjected to a complete doubling, and is evaluated according to the following method.

Lobe resilience method In the case of the panty fastening adhesive, which is normally present on the garment surface of the backsheet of most articles, it extends to the lobe area, the products which are going to be tested have to be prepared by removing the release paper, if present, and deactivating the panty fastening adhesive by applying talcum powder on it. The anatomically formed disposable absorbent article having at least one lobe is placed on a flat surface, with the surface that gives the garment contacting the surface; At least one lobe is completely bent over the surface that gives the body of the upper sheet along the longitudinal bend line, such that a bent portion of the maximum width can be achieved; in case the absorbent core has parallel rectilinear longitudinal edges, the bending line may correspond to one of said longitudinal edges; a weight is placed that exerts a pressure of 60 g / cm2 on the folded lobe, completely covering the folded portion, and leaving it in position for 3 minutes; The weight is removed after 3 minutes and the folded portion is left free for 30 seconds; The angle a between the bent portion and the flat surface is evaluated as the angle between the bent surface and the shortest segment joining the longitudinal bend line and the outermost edge of the bent portion, where an angle of 0 ° corresponds to a complete recovery of the original planar configuration (the highest lobe resilience), and an angle of 180 ° corresponds to a permanent fold, without recovery (unfolding) from the bent configuration (lower lobe resilience). Each result is averaged over 15 test samples. It has been found that lobe resilience is a good indicator for predicting the behavior during use of the lobes of an anatomically formed disposable absorbent article, while the tendency to form permanent bends in the lobes is of interest. Articles having a lobe resiliency less than 20 °, preferably less than 10 °, in combination with the desired bonding ratio less than or equal to 0.5, are particularly preferred since they show a lesser tendency to remain bent, i.e. to form permanent bends in the lobes during use. It is also understood within the scope of the present invention provided that the bonding ratio meets the requirements set forth above. For example, embodiments that only comprise two lobes, in either the front end portion or the back end portion, or in which the top sheet comprises an individual continuous layer, or, alternatively, different arrangements of the structure composite described above, such as those described in the international patent application WO93 / 09744; in addition, alternate embodiments are also possible in which there is no non-woven secondary layer. In an alternate embodiment of the present invention, the anatomically formed disposable absorbent article comprising at least one lobe, may have two fins (not shown), each of which is adjacent to and extends laterally from the respective lateral edge of the absorbent core. . The flaps are configured to drape over the edges of the wearer's panties in the crotch region such that the flaps are disposed between the wearer's panties edges and the wearer's thighs. The flaps help to avoid the staining of the body and the wearer's panties by the menstrual fluid, preferably forming a double wall barrier along the edges of the panty. The flaps may also be provided with fastening means on their surface that gives the garment such that the flaps can be folded back under the panty and fastened to the side facing the garment of the panty. The fins can be constructed of various materials including the materials used for the top sheet 30, the backsheet 50, combinations thereof, and may be a laminate having tissue in the center. In addition, the fins can be a separate element attached to the main body of the three-dimensional absorbent article or can comprise extensions of the topsheet 30 and / or backsheet 50. It is recommended, however, that the fins have a backsheet impervious to liquid. prevent the body fluids that reach the fins from staining the edges of the wearer's panties. Even though the area of the fins can be considered as constituting portions of the article comprising at least the topsheet and the backsheet and extending beyond the absorbent core, and it is generally implied that the fins do not constitute the lobes, in the intended sense according to the present invention. Preferred fins that are suitable or capable of being adapted to the three-dimensional absorbent article of the present invention are disclosed in U.S. Patent No. 4,687,478 issued Van Tilburg on August 18, 1987.; United States patent NO. 4,589,876 issued to Van Tilburn on May 20, 1986; and in U.S. Patent No. 4,608,047 issued to Mattingly on August 26, 1986. Optionally, the anatomically formed absorbent article may comprise components that naturally wrap the sides of a wearer's panties. Sanitary napkins having components that naturally surround the sides of a wearer's panties suitable for use with the three-dimensional absorbent article of the present invention are disclosed in U.S. Patent Application Serial No. 08 / 096,121 entitled " Absorbent article having panty cover components that naturally surround the sides of the panty ", filed July 22, 1993, in the name of Lavash et al. And in the United States patent application serial number 08 / 277733 entitled "Absorbent articles having covering components of the undergarment with zones of extension capacity", filed July 20, 1994 in the name of Weinberger et al. Although the anatomically shaped disposable absorbent article of the present invention has been described with reference to a pantiprotector, it can be beneficially used in the context of other disposable absorbent articles such as sanitary napkins and incontinence articles. The disposable absorbent article can also have all those characteristics and parts that are typical for the products within the context of its intended use.

Claims (7)

7 CLAIMS

1. A disposable absorbent article formed having a front end portion, and a rear end portion and a periphery, said disposable absorbent article formed consisting of overlying layers comprising a liquid permeable top sheet and a back sheet comprising at least two layers , the backsheet being attached to said top sheet at least along said periphery, and an absorbent core intermediate said top sheet and said backsheet, the disposable absorbent article formed having at least one lobe in at least one of the front end portion or the rear end portion, said at least one lobe being provided within the periphery by said top sheet and said back sheet in a region where the top sheet and the back sheet extend beyond the absorbent core, the disposable absorbent article formed having a bonding ratio in said at least one lobe defined as the relation that has as the numerator the number of superimposed layers that are directly linked to at least one adjacent layer in said at least one different lobe along said periphery, and as the denominator the total number of overlapping layers in said at least one lobe, said disposable absorbent article formed being characterized in that the joint ratio has a value that is less than or equal to 0.5. A disposable absorbent article formed in accordance with claim 1, characterized in that at least two layers of the backsheet are not joined together in said at least one lobe, other than along said periphery. 3. A disposable absorbent article formed in accordance with any preceding claim, characterized in that said backsheet is a breathable backsheet. 4. A disposable absorbent article formed in accordance with any preceding claim, characterized in that the backsheet comprises two distinct layers. 5. A disposable absorbent article formed in accordance with claim 3 or 4 characterized in that the backsheet comprises a film layer with openings and a microporous film layer. 6. A disposable absorbent article formed in accordance with any preceding claim, characterized in that it comprises two lobes in each of said front end portion and said rear end portion. A disposable absorbent article formed in accordance with any preceding claim, characterized in that said at least one lobe of said article has a lobe resilience as defined in the lobe resilience test, less than 20 °, preferably less than 10 ° .