MXPA06011055A - Disposable absorbent articles being adaptable to wearer's anatomy - Google Patents

Abstract

Absorbent articles having a liquid permeable topsheet, a liquid impermeable backsheet, and an absorbent core disposed between said topsheet and said backsheet are disclosed. The backsheet has a physical variation along at least one axis, wherein said physical variation defines a first backsheet zone and a second backsheet zone, and at least one elastomeric element having at least one primary direction of stretch, said elastomeric element at least partially overlapping and joined to first and/or second backsheet zone, wherein a relaxed pathlength of said elastomeric element in the primary direction of stretch is less than a total pathlength of said backsheet in the region of overlap. The physical variation is a measurable difference as measured by a physical property selected from the group consisting of basis weight, thickness and density.

Description

DISPOSABLE ABSORBENT ITEMS THAT ADAPT TO THE USER'S ANATOMY FIELD OF THE INVENTION The present invention relates to a disposable absorbent article having stretchable properties for a continuous and molded fit to the user's anatomy, while also being adaptable to the variable three-dimensional nature of the user's anatomy.

BACKGROUND OF THE INVENTION The main function of absorbent articles such as disposable diapers and incontinence pants for adults is to absorb and contain body exudates. A common mode of failure of these products occurs when body exudates leak out of the spaces between the article and the user's legs and / or waist to adjacent clothing because they are not immediately absorbed into the article. In this way, contemporary absorbent articles usually contain stretchable materials in the waist regions, sides and folds to provide a continuous fit and a good seal of the article to the wearer's body. A known technique for providing these stretchable materials is the incorporation of bands, films or fibrous nonwoven continuous materials made of elastomeric materials. Usually, these materials are stretchable in at least, and possibly multiple, directions. However, because films or continuous materials are made entirely of elastomeric materials, they are relatively expensive. In addition, these materials tend to adhere more to the surface of the skin, resulting in discomfort for the user of the article. In some chosen methods, these stretchable webs or films are laminated from one or more substrate layers such as continuous non-woven fabric materials, plastic films, or non-woven fabric / film composites. Since these substrates are usually made of thermoplastic materials, they have a very limited stretch capacity and are relatively rigid. Accordingly, these laminated structures provide considerable resistance to stretching and / or molding to the geometry of the user. This deficiency in the molding is aggravated by the uniformity of these laminates, thus making them incapable of adapting to the variable three-dimensional nature of the user's anatomy. Another known technique for providing these stretchable materials is the incorporation of laminates joined by the process of elongation bonding and beam lamination. The laminates bonded by the elongation bonding process are manufactured from an elastic band in the machine direction (MD), laminated to a non-woven substrate while in the stretched state, and releasing the applied tension in such a way that the substrate does not tissue gathers and takes a puckered shape. While, the beam-spun laminates are manufactured by first stretching the non-woven substrate in the machine direction in such a way that they are shirred (i.e., they reduce their dimension in the machine's transverse direction (CD)), then the webs are joined. elastics oriented in the CD direction to the substrate while the substrate is still in the stretch-strangled state.Thus, the laminate bonded by the throttling process will be stretchable in the CD direction, at least up to its original width of the nonwoven substrate before being strangled by stretching In some chosen methods, a combination of joining techniques by the elongation and throttling processes to provide elasticity in both the MD direction and the CD direction, in this combined method, at least one of the The components are in a state of tension (ie, stretched) when the components of the laminates are joined together. Combined method provides multidirectional stretching, the uniformity of these combined laminates is unable to adapt to nature variable three-dimensional anatomy of the user. Yet another known technique for providing these stretchable materials is the incorporation of elasticized laminates without resistance to deformation. Elasticized laminates without resistance to deformation are manufactured by attaching an elastomer to a nonwoven fabric while both are in a relaxed state. These laminates are then progressively stretched to impart the elastic properties. These progressively stretched laminates are stretchable only in the magnitude allowed by the unrecovered extensibility (ie, residual) of the laminate. For example, U.S. Pat. no. No. 5,156,793 discloses a method for progressively stretching a non-woven elastomer-laminate, in a non-uniform manner, to impart elasticity to the resulting laminate. Although this method can provide non-uniform stretching ability, this non-selectable stretch does not adequately adapt to the variable three-dimensional nature of the user's anatomy. What is needed is an absorbent article that has stretchable properties for a continuous and conformable fit to the user's anatomy while also being adaptable to the variable three-dimensional nature of the user's anatomy.

More specifically, said absorbent article must be formed and / or dimensioned to the user for a better fit, comfort, and appearance of the user, however it must have the ability to maintain the required tension on the user to achieve continuous adjustment and avoid collapse. and / or drop of the article. For example, said absorbent article must provide better molding (ie, contouring) of the buttocks and / or the waist region. In the case of a diaper, the best fit and comfort can also impart better performance of operation such as reduced exhaust since the diaper will conform better to the shape of a wearer.

BRIEF DESCRIPTION OF THE INVENTION A disposable, disposable absorbent article comprising an absorbent core having a garment facing surface and a body facing surface, a liquid permeable top sheet positioned adjacent said body facing surface of said absorbent core, a waterproof bottom sheet to liquids positioned adjacent said said garment-facing surface of said absorbent core, said lower canvas has a physical variation in at least the central region of the lower canvas along and overlaps at least the longitudinal axis, wherein said physical variation defines a first zone of the lower panel and a second zone of the lower panel, and at least one elastomeric element has at least one main direction of stretching, said elastomeric element overlaps at least partially and said second zone of the lower panel is joined, where a relaxed path length of said element elas The tomérico in the main direction of stretching is less than the total path length of said lower canvas in the region of overlap. Physical variation is a measurable difference as measured by a physical property chosen from the group comprising basis weight, thickness and density. The physical variation is such that said second zone of the lower canvas has a lower value than said first zone of the lower canvas. The absorbent article further comprises a front waist region, a posterior waist region, a crotch region and, optionally, a buttock region. The lower canvas areas may be placed in one or more of said regions. The absorbent article may further comprise a third zone of the lower canvas which may be placed in one or more regions. The absorbent article may further comprise a second elastomeric element which may be placed in one or more lower canvas areas. The first and / or second elastomeric elements may be linear or non-linear (e.g., substantially "U", etc.). The absorbent article can be a disposable diaper (eg, underpants, non-preformed diapers), catamenia, incontinence product for adults, or any other similar product.

BRIEF DESCRIPTION OF THE FIGURES Although the specification concludes with the claims that particularly state and clearly claim the invention, it is believed that the present invention will be better understood from the following drawings when considered together with the accompanying description, in which like components are designated with the same reference number. FIG. 1 is a plan view of a non-exhaustive general exemplary embodiment of a diaper in accordance with the invention; FIG. 2 is a plan view of a non-exhaustive example embodiment of a diaper in accordance with the invention; FIG. 3 is a plan view of another exemplary non-exhaustive embodiment of a diaper in accordance with the invention; FIG. 4 is a plan view of yet another non-exhaustive exemplary embodiment of a diaper in accordance with the invention; • FIG. 5 is a plan view of yet another exemplary non-exhaustive embodiment of a diaper in accordance with the invention; FIG. 6 is a plan view of yet another exemplary non-exhaustive embodiment of a diaper in accordance with the invention; FIG. 7 is a plan view of yet another exemplary non-exhaustive embodiment of a diaper in accordance with the invention; FIG. 8 is a plan view of a non-exhaustive general exemplary embodiment of a brief according to the invention; FIG. 9 is a plan view of the non-exhaustive example embodiment of FIG. 7; FIG. 10 is a schematic cross-sectional view of the non-exhaustive example embodiment of FIG. 9 being used as illustrated along line 10-10 in FIG. eleven; FIG. 10b is a cross-sectional schematic view of the non-exhaustive example embodiment of FIG. 8 being used as illustrated along the line -10 in FIG. eleven; FIG. 11 is a side elevational view of the exemplary, non-limiting diaper of FIG. 2 used by a user; and FIG. 12 is a schematic side elevational view of the diaper in FIG. eleven.

DETAILED DESCRIPTION OF THE INVENTION As used in this document, the following terms have the following meanings: The term "disposable" in this document is used to describe absorbent articles that are generally not intended to be washed or otherwise restored or reused, such as absorbent articles (ie, are intended to be disposed of after a single use and preferably recycle them, convert them into fertilizer or otherwise dispose of them in a manner compatible with the environment). The term "placed" is used to mean that an element (s) is formed (attached and placed in position) in a particular place or position as a unitary structure with other elements or as a separate element attached to another element. The term "joined" encompasses the configurations according to which one element is attached to another element by joining the element directly to the other element, and the configurations according to which one element is indirectly attached to another element by joining the element to member ( s) intermediate (s) which in turn are fixed to the other element. The term "unitary" absorbent article refers to absorbent articles that are formed of separate parts joined together to form a coordinated entity such that they do not require separately manipulated parts such as a separate fastener or liner. The term "diaper" refers to an absorbent article that babies and incontinent people usually use around the lower part of the torso. The term "stretch" means that a material has the ability to extend beyond its original length in at least one dimension when subjected to a tensile force (i.e., tension) applied in the direction of that dimension. "Stretching" can be unidirectional, bidirectional, or multidirectional. The "stretching" properties of a material can vary along any of the stretch vectors. As used herein, the stretch includes both plastic and elastic deformation. The terms "elastic" or "elasticity" mean that a material has the ability to return to less than 120% of its original pre-stretched dimension such as subjecting it to tension or a force in that dimension and then releasing the stretching tension in the material ( that is, allowing the material to relax). The term "elastic resistance force" describes an elastic force that tends to resist an applied tensile force. Furthermore, said elastic force causes a material to tend to shrink to a relaxed configuration. The strength of elastic resistance can be measured conveniently according to the methods described in Edana: Tensile Strength 20.2-89, where the strength of elastic resistance is measured when the material sample is stretched at 25% of 25% elongation. The term "longitudinal" refers to a direction that extends parallel to the maximum linear dimension of the article, and includes directions within ± 45 ° of the longitudinal direction. The "lateral" or "transverse" direction is orthogonal to the longitudinal direction. The "Z direction" is orthogonal to both longitudinal and transverse directions. The "x-y plane" plane refers to the plane congruent with the longitudinal and transverse directions. The terms "water-permeable" and "water-impermeable" refer to the penetrability of the materials in the context of the intended use of the disposable absorbent articles. Specifically, the term "water permeable" refers to a layer or layered structure having pores, openings and / or interconnected voids that allow liquid water to pass through its thickness in the absence of a pressing force. . Conversely, the term "waterproof" refers to a layer or layered structure through whose thickness liquid water can not pass in the absence of a pressing force. A layer or layered structure that is impervious to water according to this Definition can be permeable to water vapor, that is, it can be "vapor permeable". As is known in the industry, a common method for measuring the water permeability of materials commonly used in absorbent articles is a hydrostatic pressure test, also called a hydrostatic head test or simply a "head" test. Compendiums of suitable well-known methods for hydrostatic pressure testing are approved by INDA (formerly International Nonwovens and Disposable Association, now The Association of the Nonwoven Fabrics Industry) and EDANA (European Disposables and Nonwovens Association). The term "substrate" refers to any material, including a film, a perforated film, a continuous non-woven fabric material, a continuous woven fabric material, a foam, or a combination thereof, or a cellulosic material including wood pulp. wood, derived or modified cellulose materials, and the like, which have a single layer or multiple layers. The term "fibrous substrate" as used herein refers to a composite material of a multiplicity of fibers which may be a natural or synthetic material or any combination thereof, including, for example, nonwovens, woven materials, materials knitted fabrics and any combination thereof. The term "non-woven fabric" refers to a fabric made of continuous filaments and / or discontinuous fibers. Non-woven fabrics include those that are manufactured by carding staple fibers, by the process of air laying or wet laying of staple fibers and by way of extrusion processes such as consolidated filaments and melt blow. The non-woven fabric material may comprise one or more layers of non-woven fabric wherein each layer may include continuous filaments or discontinuous fibers. The non-woven materials may also comprise bicomponent fibers, which may have sheath / core, side-by-side, or other known structures. The term "path length" refers to a measurement along the topographic surface of the region in question in a direction substantially parallel to an axis. For example, when an elastic zone is characterized, a relaxed path length of the elastomeric element is measured and the total path length (i.e., total length of the surface along the shirred two-dimensional topographic path) of the zone of the lower canvas. A method for determining the path length (i.e., path length of the surface) of the respective regions can be found in the Test Methods section indicated in U.S. Pat. no. 5,916,663, entitled "Web materials exhibiting elastic-like behavior" (Continuous materials exhibiting an elastic type behavior), granted to Chappell et al. on July 29, 1999. FIG. 1 is a plan view of a non-exhaustive general exemplary embodiment of a diaper 20 of the present invention in its unstressed and flattened state (ie, without induced elastic contraction) with portions of the structure cut to more clearly show the underlying structure of the diaper 20 and with the portion of the diaper 20 contacting the wearer shown facing the viewer. The diaper 20 includes a longitudinal axis 1000 and a lateral axis 1100. A portion of the end 36 of the diaper 20 is configured as a front waist region 36 of the diaper 20. The opposite end portion 38 is configured as a back region of the diaper 20. waist of the diaper 20. An intermediate portion 37 of the diaper 20 is configured as a crotch region 37, which extends longitudinally between the anterior and posterior regions 36 and 38. The waist regions 36 and 38 generally comprise portions of the diaper 20 which, when used, surround the user's waist. The waist regions 36 and 38 may include elastic elements so that they are attached around the wearer's waist to improve fit and containment. The crotch region 37 is that portion of the diaper 20 that when the diaper is in use is usually placed between the legs of the wearer. Another optional intermediate portion 39 of the diaper 20 is configured as a breech region, which may be located at or near the proximal end of the posterior region of the waist 38 as shown, or alternatively, may overlap the crotch region. 37 and the posterior region of the waist 38. The outer periphery of the diaper 20 is defined by the longitudinal edges 14 and the edges of the ends 10, 12 which are located along the anterior and posterior region of the waist 36, 38, respectively. The chassis 22 of the diaper 20 comprises the main body of the diaper 20. The chassis 22 comprises an outer cover including a liquid permeable top sheet 24 and / or a liquid impermeable lower sheet 26 and at least a portion of an absorbent core 28 enclosed between the upper canvas 24 and the lower canvas 26. For the unitary absorbent articles, the chassis 22 comprises the main structure of the diaper with other attributes added to form the composite structure of the diaper. Although the upper web 24, the lower web 26 and the absorbent core 28 can be assembled in a variety of well-known configurations, preferred diaper configurations are generally described in U.S. Pat. no. 3,860,003 entitled "Contractible Side Portions for Disposable Diaper" awarded to Kenneth B. Buell on January 14, 975; U.S. patent no. 5,151, 092 issued to Buell on September 9, 1992; U.S. patent no. 5,221, 274 granted to Buell on June 22, 1993; and U.S. patent no. 5,554,145 entitled "Absorbent Article With Multiple Zone Structural Elastic-Like Film Web Extensible Waist Feature" (absorbent article with elastic waist characteristics of continuous material of structural elastic film type with multiple zones) given to Roe et al. on September 10, 1996; U.S. patent no. 5,569,234 entitled "Disposable Pull-On Pant" awarded to Buell et al. on October 29, 1996; U.S. patent no. 5,580.41 1 entitled "Zero Scrap Method For Manufacturing Side Panels For Absorbent Articles" (Method for the manufacture of side panels without waste) granted to Nease et al. on December 3, 1996; and U.S. patent no. 6,004,306 entitled "Absorbent Article With Multi-Directional Extensible Side Panels" (Absorbent article with extensible multidirectional side panels) granted to Robles et al. on December 21, 1999; each of which is incorporated in this document as a reference. The upper web 24 may be fully or partially elastically elastized or it may be gathered to form a hollow space between the upper web 24 and the core 28. Illustrative structures that include elastized or shirred top sheets are described in more detail in U.S. Pat. UU no. 4,892,536 issued to DesMarais et al. on January 9, 1990 entitled "Absorbent Article Having Elastic Strands" (Absorbent article with elastic bands) no. 4,990,147 issued to Freeland on February 5, 1991 entitled "Absorbent Article With Elastic Liner For Waste Material Isolation" (Absorbent article with elastic lining to isolate waste materials); no. ,037,416 issued to Alien et al. on August 6, 1991 entitled "Disposable Absorbent Article Having an Elastically Extensible Topsheet" (Disposable absorbent article with an elastically extensible top sheet); and No. 5,269,775 issued to Freeland et al. on December 14, 993 entitled "Trisection Topsheets for Disposable Absorbent Articles and Disposable Absorbent Articles Having Such Trisection Topsheets" (Top sheets with three sections for disposable absorbent articles and absorbent articles with top sheets of three sections); each of which is incorporated herein by reference. The absorbent core 28 may comprise any absorbent material that is generally compressible, moldable, does not irritate the wearer's skin and is capable of absorbing and retaining liquids such as urine and other certain body exudates. The absorbent core 28 may contain a wide variety of liquid absorbent materials commonly used in disposable diapers and other absorbent articles, such as, for example, crushed wood pulp, which is generally referred to as air felt. Examples of other suitable absorbent materials include creped cellulose wadding; meltblown polymers, including coform polymers; chemically modified, stiffened or crosslinked cellulosic fibers; tissue paper, including compressible laminates or tissue paper laminates; absorbent foams; absorbent sponges; superabsorbent polymers; absorbent gelling materials; or any other material or combination of known absorbent materials. Illustrative absorbent structures for use as absorbent assemblies are described in U.S. Pat. no. 4,610,678 entitled "High-Density Absorbent Structures" granted to Weisman et al. on September 9, 1986, no. 4,673,402 entitled "Absorbent Articles With Dual-Layered Cores" (Absorbent Articles with Dual Layer Cores) Weisman et al. on June 16, 1987; no. 4,834,735 entitled "High Density Absorbing Members Having Lower Density and Lower Basis Weight Acquisition Zones" (Absorbent elements with areas of lower density and lower basis weight) given to Alemany et al. on May 30, 1989; no. 4, 888, 231 entitled "Absorbent Core Having A Dusting Layer" (granted to Angstadt on December 19, 1989; no. 5,137,537 entitled "Absorbent Structure Containing Individualized, Polycarboxylic Acid Crosslinked Wood Pulp Cellulose Fibers" (Absorbent structure containing individual cross-linked wood pulp cellulosic fibers of polycarboxylic acid) given to Herron et al. on August 11, 1992, no. 5,147,345 entitled "High Efficiency Absorbent Articles for Incontinence Management" (Highly Efficacious Absorbent Articles for Incontinence) granted to Young et al. on September 15, 1992; no. 5,342,338 entitled "Disposable Absorbent Article For Low-Viscosity Fecal Material" (Disposable absorbent article for low viscosity stools) granted to Roe on August 30, 1994; no. 5,260,345 entitled "Absorbent Foam Materials For Aqueous Body Fluids and Absorbent Articles Containing Such Materials" (Absorbent sponge materials for containing aqueous body fluids and absorbent articles containing these materials) given to DesMarais et al. on November 9, 1993; no. 5,387,207 entitled "Thin-Until-Wet Absorbent Foam Materials for Aqueous Body Fluids and Process for Making Same" (Absorbent sponge materials that are kept thin until wet, which are used to contain aqueous body fluids and their process) to Dyer et al. on February 7, 1995; no. 5,397,316 entitled "Slitted Absorbent Members For Aqueous Body Fluids Formed Of Expandable Absorbent Materials" (Absorbent elements with slits for aqueous body fluids made with expandable absorbent materials) given to LaVon et al. March 14, 1995; and No. 5,625,222 entitled "Absorbent Foam Materials For Aqueous Fluids Made From High Intemal Phase Emulsions Having Very High Water-To-Oil Ratios "(Absorbent sponge materials for aqueous fluids made from high internal phase emulsions with very high water / oil ratios) awarded to DesMarais et al on July 22, 1997. These patents are hereby incorporated by reference The bottom sheet 26 is generally the portion of the diaper 20 positioned adjacent the garment facing surface of the absorbent core 28. The bottom sheet 26 prevents the exudates absorbed and contained therein from soiling. articles that can make contact with the diaper 20, such as, for example, the sheets and underwear In preferred embodiments, the bottom sheet 26 is substantially impermeable to liquids (eg, urine) and comprises a laminate of a fabric non-woven and a thin plastic film such as a thermoplastic film having a thickness between about 0.012 mm (0.5 mil) and 0.051 mm (2.0 mils). Suitable bottom canvases include those manufactured by Tredegar Industries Inc. of Terre Haute, IN and marketed under the trade names of X15306, X10962 and X10964. Other suitable bottom canvas materials may include breathable materials that allow vapors to escape from the 20 and at the same time prevent exudates from passing through the bottom canvas 26. Exemplary breathable materials may include materials such as continuous cloth materials woven, continuous nonwoven fabric materials, composite materials such as continuous nonwoven materials with coating film, and microporous films such as those manufactured by Mitsui Toatsu Co. of Japan under the name of ESPOIR NO and by EXXON Chemical Co. de Bay City, TX with the name of EXXAIRE. Suitable permeable composite materials comprising polymer blends are distributed by Clopay Corporation of Cincinnati, OH under the trademark HYTREL blend P18-3097. These permeable composite materials are described in greater detail in PCT application no. WO 95/16746 published June 22, 1995 in the name of E. I. Dupont and in the U.S. patent application Ser. copendiente serial number 08 / 744,487 filed on November 6, 1996 on behalf of Curro. Other permeable bottoms which include continuous non-woven fabric and orifice formed films are described in US Pat. no. 5,571,096 issued to Dobrin et al. on November 5, 1996. An example of suitable backsheet is described in U.S. Pat. no. 6,107,537 entitled "Disposable absorbent articles providing a skin condition benefit" (Absorbent articles that provide a skin conditioning benefit) granted to Eider et al., On August 33, 2000. Other suitable materials and / or manufacturing techniques may be used for providing an adequate underlay 26 including, but not limited to, surface treatments, selections and particular film processes, selections and particular filament processes, etc. All of these references are included as references herein. The lower canvas 26 may also consist of more than one layer, as illustrated in FIG. 1, wherein an outer layer of the lower canvas 26 (often referred to as the lower canvas) can be made of a soft non-woven material and an inner layer of the lower canvas 27 can be made of a substantially impermeable film. Adhesive 29, or any other suitable material or method, can be used to bond layers 26 and 27 together. A known method for bonding these materials is to apply adhesive in a continuous striped pattern, discontinuous continuous striped pattern or a dot pattern. Although a variety of backsheet configurations are contemplated herein, it would be apparent to those skilled in the industry that various changes and modifications can be made without departing from the spirit and scope of the invention. The diaper 20 may also include a fastening system 55. The fastening system 55 preferably maintains the first waist region 36 and the second waist region 38 in a configuration to provide lateral stresses around the circumference of the diaper 20 to hold the diaper. 20 on the user. The fastening system 55 preferably comprises a clamping device, such as adhesive tabs, hook and loop fastening components, interlacing fasteners such as tabs and slots, buckles, snap buttons, and / or tongue and groove fastening components, although any other known fastening means are generally acceptable. Some illustrative surface fixing systems are described in U.S. Pat. no. 3,848,594 entitled "Tape Fastening System for Disposable Diaper" (Adhesive tape fastening system for disposable diapers), issued to Buell on November 19, 1974; no. B1 4,662,875 entitled "Absorbent Article" granted to Hirotsu et al. on May 5, 1987; no. 4,846,815 entitled "Disposable Diaper Having An Improved Fastening Device" (Disposable diaper having an improved fastening device) issued to Scripps on July 11, 1989; no. 4,894,060 entitled "Disposable Diaper With Improved Hook Fastener Portion "(Disposable diaper having improved hook fastening portion) issued to Nestegard on January 16, 1990; No. 4,946,527 entitled" Pressure-Sensitive Adhesive Fastener and Method of Making Same "(Pressure-sensitive adhesive fixative and method for its manufacture) granted to Battrell on August 7, 1990 and the US patents cited above, No. 5,151, 092 issued to Buell on September 9, 1992, US Patent No. 5,221,274 issued. a Buell on June 22, 1993. A suitable interlock setting system is described in co-pending US Patent No. 6,432,098 entitled "Absorbent Article Fastening Device" on behalf of Kline et al., Issued Aug. 12, 2002. The fastening system 55 may also provide a means for holding the article in a disposable configuration as described in U.S. Patent No. 4,963,140 issued to R Obertson et al on October 16, 1990. The fastening system may also include primary and secondary fixation systems, as described in U.S. Pat. no. 4,699,622 entitled "Disposable Diaper Having An Improved Side Closure" (Disposable diaper having an improved side closure) given to Toussant et al. on October 13, 1987, to reduce the displacement of overlapping portions or to improve the fit as described in U.S. Pat. no. 5,242,436 entitled "Absorbent Article With Fastening System Providing Dynamic Elasticized Waistband Fit" (Absorbent article with fastening system that provides a dynamic elasticated waistband fit) awarded to Weil et al. on September 7, 1993; no. 5,499,978 entitled "Absorbent Article With Dynamic Elastic Waist Feature Having A Predisposed Resilient Flexural Hinge" (Absorbent article having a predisposed resilient flexural hinge) awarded to Buell et al. on March 19, 1996; no. 5,507,736 entitled "Absorbent Article With Dynamic Elastic Waist Feature Comprising An Expansive Tummy Panel" (Absorbing article with dynamic elastic waist device comprising an expansive belly panel) given to Clear et al. on April 16, 1996; no. 5,591, 152 entitled "Absorbent Article With Dynamic Elastic Waist Feature Having A Predisposed Resilient Flexural Hinge" (Absorptive article with dynamic elastic waist device having a predisposed resilient flexural hinge) awarded to Buell et al. on January 7, 1997. All of these patents and the copending application are included as references herein. In alternative embodiments, the article may be pre-formed by the manufacturer to create a pant. The term "short", as used herein, refers to disposable garments that have a waist opening and leg openings designed for infants and adult users. A brief may be placed in position on the wearer by inserting the legs of the wearer into the leg openings and sliding the shorts into position around the wearer's lower torso. A pant may be preformed by any suitable technique, but not limited to, joining the portions of the article together using indexable and / or unadjusted unions (eg, seams, welds, adhesive, cohesive bond, fastener, etc.). . A brief may be preformed anywhere along the circumference of the article (eg, lateral fixation, anterior waist fixation). Although the term "briefs" is used herein, briefs are commonly referred to as "closed diapers," "pre-set diapers," "coaching diapers," "training shorts," and "diaper pants." Suitable underpants are described in U.S. Pat. no. 5,246,433, issued to Hasse, et al. September 21, 1993; the U.S. patent no. 5,569,234, issued to Buell et al. on October 29, 1996; the U.S. patent no. 6,120,487, granted to Ashton on September 19, 2000; the U.S. patent no. 6,120,489, issued to Johnson et al. on September 19, 2000; the U.S. patent no. 4,940,464 issued to Van Gompel et al. on July 10, 1990; the U.S. patent no. 5,092,861, issued to Nomura et al. March 3, 1992; US patent application no. series 10/171, 249, entitled "Highly Flexible And Low Deformation Fastening Device", presented on June 13, 2002; the U.S. patent no. 5,897,545, issued to Kline et al. on April 27, 1999; the U.S. patent no. 5,957,908, issued to Kline et al., On September 28, 1999, the disclosures of which are included herein. The diaper 20 can also include other features as known in the industry including the folds, the front and rear ear panels, waist termination devices, a belt, elastics and the like to provide better fit, containment and aesthetic These additional devices are well known in the industry and are described in U.S. Pat. no. 3,860,003 and no. 5,151,092, which are incorporated herein by reference. The diapers 20 are preferably applied to a wearer by placing one of the waist regions under the wearer's back and pulling the rest of the diaper between the wearer's legs so that the other waist region is positioned along the part of the wearer. front of the user. The fasteners 55 are subsequently used by the caregiver to join the anterior and posterior waist regions to surround the wearer's waist. Elasticized side panels are usually stretched and tensioned during this operation to conform to the size and shape of the user. FIG. 2 is a plan view of a non-exhaustive exemplary embodiment of a diaper 120 of the present invention in its non-collapsed and flattened state (i.e. without induced elastic shrinkage) with the lower canvas 126, which contacts the wearer's garment, shown oriented towards the observer. The bottom sheet 126 has at least two backsheet areas that differ from each other in at least one of the following physical properties: basis weight, thickness, and density. For example, a second region of the lower panel 170 has a lower value of one of said physical properties than a first region of the lower panel 160. In addition, the proportion of said property in the second region of the lower panel 170 to the value of the same property in the first zone of the lower canvas 160 is less than about 0.8, more preferably less than about 0.7, and with a greater preference less than about 0.6. Typically, the ratio of the property in the second zone of the lower panel 170 to that in the first zone of the lower panel 160 ranges from approximately 0.5 to 0.8. To a large extent, the physical property (s) of the lower canvas are measured when the lower canvas is in its extended and flattened state (i.e., not folded, folded, creased, or elastically gathered) and is Carefully remove the rest of the article. When doing this, care must be taken not to destroy the sample or cause an accidental exaggerated deformation of any part of the sample. The layers of the sample can be frozen to help separate them from the adjacent layers of the sample, when necessary. Freezing can be achieved using the PH100-15 refrigerant manufactured by Philips ECG, Inc. of Waltham, Massachusetts. The average basis weight of an area of the lower canvas can be measured by weighing a known area of the lower canvas area and then dividing the weight by the measured area. As an alternative, a sample cutting tool can be used to ensure appropriate, consistent and predefined sample sizes. By doing this, die cutting can be done in one or more layers of the article as long as the lower canvas is finally removed from the other layers. In this way, any subsequent deformation of the bottom canvas material before weighing is not important since the basis weight of the original sample is equal to the weight of the sample divided by the area of the predefined cut area (i.e., the original size of the sample). Finally, and it is applicable hereafter, said physical properties can be calculated as an average of multiple measurements, as appropriate. The backsheet regions of the present invention described herein are preferably located primarily in the central portion of the diaper, overlapping the longitudinal axis of the diaper. A lower basis weight, thickness or density of the second zone of the lower canvas 170 can be achieved by means of known suitable techniques including, but not limited to, the partial plastic deformation (eg, stretching) of said second zone of the bottom canvas in at least one of the length and width dimension. For example, said stretching may be performed by a process commonly referred to as "ring-rolling", as described in U.S. Pat. no. 5,167,897, entitled "Method for incrementally stretching to zero strain stretch web to impart elasticity thereto" (Method for progressively stretching a continuous elastic laminate material of zero deformation) to Weber et al., On December 1, 1992. The depth of coupling of the annular roller may be varied along the longitudinal axis 1000 of the lower canvas 126 to produce the different first and second zones of the backsheet. - The aforementioned method of stretching the material of the bottom material sheet can be achieved by any suitable means including, but not limited to the use of inclined or non-inclined ring rolls having interlocking and interpenetrating teeth. In any case, the teeth can couple the material in different depths of coupling together with the width and / or the length of the material to provide different stretch zones. Typically, said coupling imparts a stretch applied between 0% and 200% to the material. In the case of inclined activation, the changing coupling depth can be achieved by roughing the rollers coupled to different circumferences so that their teeth engage in different depths. In the case of non-inclined activation, for example, the rollers can be manufactured in concentric diameters equal but their center-to-center distance can be changed to alter their coupling depth. For example, an upper roller can be urged down to engage a lower roller, but the upper roller can be raised (eg, by a cam against the roller axis) periodically to alter the depth of engagement. When the material is stretched, holes in such material are often not desirable. One known technique for minimizing the number of unwanted holes is to control the deformation rate (eg, less than 800 sec-1, more preferably less than 300 sec-1). The deformation speed can be controlled by controlling the speed and diameter of the roller. In addition, the holes may result when the adhesive is applied in an area that connects two or more adjacent activation teeth. More specifically, the adhesive can be deformed until it fails, thus resulting in a high release of the deformation rate that causes holes in the adjacent material. One known technique for minimizing failure is to apply said adhesive discontinuously such that it does not connect two or more adjacent activation teeth. Another known technique is to apply heat (eg over 40 ° C, preferably over 50 ° C) to said adhesive before or during the stretching process to make it more fluid and less brittle. Despite the method of stretching used, the incorporation of different areas of the lower panel allows various configurations of the absorbent article 120 considering the variable three-dimensional nature of the user's anatomy. For example, the second zone of the lower canvas 170 is more comfortable around the user due to its lower value of one of said physical properties. further, the second zone of the lower canvas 170 provides better coverage of the user's anatomy in its stretched state. Accordingly, the second zone of the lower panel is better adapted to be molded around the user, for example, the region of the buttocks 39 where the user's body protrudes more. Conversely, the first zone of the lower canvas 160 does not need to be so conformable to fit the wearer in the crotch region 37 and the front waist region 36. In certain preferred embodiments, the second area of the lower canvas is overlapped. to the posterior portion of the absorbent core. In these embodiments, the portion of the second lower canvas region that overlaps the core preferably is not attached to the core or is attached only in a narrow region along the longitudinal axis of the article. The area of attachment between the absorbent core and the second zone of the lower canvas preferably is less than half the area of overlap. In other preferred embodiments, the second zone of the lower panel does not extend fully to the rear lateral edge of the article (i.e., the total path length of the lower panel at the rear lateral edge of the article is less than the total path length of the panel. lower in the second area of the lower canvas). Further, in accordance with the present invention, an elastomeric element 190 can be applied to the lower canvas 126 to provide a continuous and molded fit to the wearer's body. The elastomeric element 190 can be attached to the lower canvas 126 in an area at least partially superimposed on the second area of the lower canvas 170 and preferably superimposed on the longitudinal axis of the article. Preferably, the relaxed path length of the elastomeric element 190 is shorter than the total path length of the lower panel 126 within the second region of the lower panel 170 in its joining area. For example, the ratio of the relaxed path length of the elastomeric element 190 to the total path length of the lower panel 126 within the second zone of the lower panel 170 in the bonded area is less than about 0.8, more preferably less than about 0.7, and with a greater preference less than about 0.6. Importantly, the difference between these path lengths defines the maximum elongation of the elastic zone. The elastomeric element can be lengthened to a total path length of the lower canvas in the area of the zone in the elastic zone with only minimal resistance of the lower canvas. However, as soon as the elastomeric element is lengthened to the total path length of the lower canvas, the material of the lower canvas offers significant resistance to further elongation (i.e., the lower canvas acts to provide a "wall of strength" to avoid further significant elongation under the forces normally found in a usable absorbent article). In addition, the path length of the upper canvas 24 may be shorter than the path length of the lower canvas 126 to provide an additional strength wall. This phenomenon is important to avoid the fall of the article when loaded by the excrement of the user or deformed by the user's physical activity. Further, in preferred embodiments, the force required to elongate the elastic area a certain ratio is less than the force required to proportionally lengthen one of the elastic ears or side panels. The elastomeric element 190 can be attached in an unstretched state to the lower canvas 126 in the desired area of the lower canvas prior to the stretching process (eg, ring-rolling). The elastomeric element 190 can stretch to approximately the same degree as the lower canvas 12 within the area of the lower canvas, in its area of overlap, during the stretching process. However, when releasing stretch tension, the elastomeric element 190 relaxes to a shorter path length than that of the lower canvas 126 in the stretched area (ie, the elastomeric element 190 recovers a greater percentage of the applied deformation). Alternatively, the elastomeric element 190 may be attached to the lower canvas 126 or the upper canvas in a pre-stretched condition anteriorly, or posteriorly, to the aforementioned stretching step. Suitable elastomeric elements include, but are not limited to, films, perforated films, bands, extruded webs, extruded elastomers, slot-coated elastomeric adhesives, printed elastomers, lightweight fabrics, foams, elastic non-woven fabrics, and materials made by the process SELF (as illustrated in U.S. Patent No. 5,916,663, supra). In preferred embodiments, the elastomeric element 190 is oriented in a substantially lateral direction and the stretching process of the lower canvas extends the lower canvas 126 in substantially the same direction, thus resulting in a main stretch vector 173 of the elastic zone 172 oriented around of the user's back waist. Where an area of the lower canvas (eg, second lower canvas area 170) and an elastomeric element (eg, elastomeric element 190) overlap, an elastic zone 172 is created. More specifically, for example, the elastomeric element 190 is joined in at least one area that at least partially overlaps the area of the second region of the lower canvas 170 to form the elastic zone 172. In this way, the elastic zone 172 provides the combined functions of improved coverage, continuous and molded adjustment to the three-dimensional variant geometries of the user's body. The stretch zone 172 can be characterized by measuring the relaxed path length of its elastomeric element 190 and measuring the total path length of its second zone of the lower canvas 170 as described above. Typically, the stretching zones have the following properties: (1) an elastic strength strength (ie, a standardized load at 25% stretch) of at least about 0.03 N / cm, preferably 0.03 N / cm to about 50 N / cm, more preferably from about 0.05 N / cm to about 40 N / cm, and most preferably from 0.25 n / cm to about 30 N / cm; 2) a deformation percentage of less than about 25%, preferably less than about 15% and more preferably less than about 10%; and and (3) a value of the relaxation force of less than about 50%, preferably less than about 30% and more preferably less than about 20%. In the U.S. patent application with no. of series 10/288095, registered on November 5, 2002 and published as 2003 / 0088228A1, a series of methods are provided to measure these properties. Each elastic zone can have continuous or discontinuous properties in any direction where variable properties include chemical composition, elasticity, extensibility, maximum elongation, other stress / strain properties, vectors or angles, basis weight, geometry, dimensions, three-dimensional morphology, visual differentiation, and the like. An elastic zone may have continuous properties (eg, the elastomeric composition, the substrate material and / or the treatment has relatively homogeneous properties). Alternatively, stretch zones may have discontinuous properties due to the provision of inhomogeneous properties thereto. In certain embodiments, at least a portion of at least one elastic zone may be visually distinct. In certain preferred embodiments, the elastic zone at least partially overlaps the region between the back fasteners of the article for storing elastic energy in a continuous tension line to improve molding and continuous adjustment of the article. FIG. 3 is a plan view of another exemplary non-exhaustive embodiment of a diaper 220 of the present invention in its non-collapsed and flattened state (ie, without induced elastic contraction) with the lower canvas 226, which contacts the wearer's garment , shown oriented towards the observer. Similar to FIG. 2, the diaper 220 has a first area of the lower panel 260 and a second region of the lower panel 270. In addition, the diaper 220 has a third region of the lower panel 280. The first area of the lower panel 260 is placed primarily in the crotch region 237 and the front waist region 236. The second region of the bottom panel 270 is located primarily in the distal portion of the posterior region of the waist 238. The third zone of the bottom panel 280 is positioned longitudinally inward of the second lower canvas area 270 (eg, primarily in the buttock region 239). The third lower canvas zone 280 has a lower basis weight, thickness, or density than those of the second lower canvas region 270 which has a lower basis weight, thickness, or density than those of the first zone of the canvas Bottom 260. The third lower canvas area 280 is designed to conform to the buttocks projecting outward from the wearer. The diaper 220 also has an elastomeric element 290 which overlaps a portion of the second lower canvas area 270 and is attached to the diaper in the overlap, thereby forming an elastic zone 272 having a primary direction of stretching in the direction lateral as indicated by arrow 273. Elastic zone 272 may be characterized by measuring the relaxed path length of its elastomeric element 290 and measuring the total path length of its second lower canvas zone 270 as described herein. The elastic zone 272 (i.e., the second lower canvas area 270 combined with the elastomeric element 290) is located near the distal portion of the posterior region of the waist 238 to anchor the diaper 220 to the region of the user's lower back, treated later. As illustrated in this embodiment, not all areas of the lower canvas (herein the third lower canvas region 280) overlie an elastomeric element.

Although the third zone of the lower panel 280 does not provide elastic recovery to the diaper 220, it may function to cover and mold to the user's anatomy and to carry the tensions or loads associated with the user's anatomy or movement, or the diaper or the diaper. content of this, p. eg, across the waist region or the buttocks of the article, especially in regions where they are not glued to the absorbent core (not shown) or other thicker and stiffer diaper elements. As illustrated, these zones may be distinct zones having different properties than the lower canvas area (s) comprising the elastic zone (s). Alternatively, these zones may comprise the portions of any of the zones of the lower canvas areas not attached to an elastomeric element. Finally, in a non-exhaustive example, the absorbent core (not shown) is fixed 226 in the third zone of the lower panel 280 along the longitudinal center line 1000 or in no way where the zone of the lower panel is superimposed on the absorbent core. . In another non-exhaustive example, the absorbent core (not shown) does not extend into the second zone of the lower canvas 270. FIG. 4 is a plan view of yet another exemplary non-exhaustive embodiment of a diaper 320 of the present invention in its non-collapsed and flattened state (ie, without induced elastic shrinkage) with the bottom canvas 326, which contacts the garment of the user, shown oriented towards the observer. Similar to FIG. 3, the diaper 320 has a first lower canvas area 360, a second lower canvas region 370 and a third lower canvas area 380. The first lower canvas area 360 is placed mainly in the crotch region 337 and the lower part of the lower canvas 360. frontal waist region 336. The second lower canvas region 370 is located mainly in the distal portion of the posterior region of the waist 338. The third lower canvas area 380 is located mainly in the posterior region of the waist 338 with at least a portion extending into the buttock region 339. The third zone of the lower panel 380 has a lower basis weight, thickness, or density than the second zone of the lower panel 370 which has a basis weight, thickness, or a lower density than the first zone of the lower panel 360. The third zone of the lower panel 380 is designed in such a way that it molds to the buttocks projecting outward from the user . The diaper 320 also has an elastomeric element 390 which is superposed and attached to a portion of the second lower canvas region 370 and the third lower canvas region 380, thus forming two distinct elastic zones 372, 382 having a main direction of stretch in the lateral direction as indicated by arrow 373. Thus, only an individual elastomeric element 390 is required to create a first elastic zone 372 and a second elastic zone 382. Elastic zone 372 (ie, the second lower canvas area 370 combined with elastomeric element 390) is located near the distal portion of the posterior region of waist 338 to anchor the diaper 320 to the lower back of the wearer, discussed below. The stretch zone 382 (i.e. the third zone of the bottom sheet 370 combined with the elastomeric element 390) is located longitudinally within the stretch zone 372 and substantially laterally aligned with the fasteners 355. As is more Extendable that the stretching zone 372, the stretching zone 382 facilitates the user or the caregiver pulling the fastening elements 355 laterally, especially during the application and the generation of a tension line between the fastening elements; while the stretching zone 372 continues to provide anchoring within the rear region of the waist 338 and prevents the formation of gaps in the posterior edge of the waist. In a non-exhaustive example, the absorbent core (not shown) is attached to the lower canvas 326 in the third lower canvas area 380 along the longitudinal centerline 1000 or in any way. In another non-exhaustive example, the absorbent core (not shown) does not extend into the second zone of the lower canvas 370. FIG. 5 is a plan view of yet another exemplary non-exhaustive embodiment of a diaper 420 of the present invention in its uncompacted and flattened state (ie, without induced elastic contraction) with the lower canvas 426, which contacts the garment of the user, shown oriented towards the observer. Similar to FIG. 3, the diaper 420 has a first lower canvas area 460, a second lower canvas area 470 and a third lower canvas area 480. The first lower canvas region 460 is placed mainly in the crotch region 437 and the front waist region 436. The second zone of the bottom sheet 470 is placed mainly in the distal portion of the posterior region of the waist 438. The third area of the bottom sheet 480 is placed mainly in the posterior region of the waist 438 with the minus one portion extending into the buttock region 439. The third lower canvas region 480 has a lower basis weight, thickness, or density than the second lower canvas area 470 which has a basis weight, thickness, or density lower than the first zone of the lower panel 460. The third zone of the lower panel 480 is designed in such a way that it molds to the buttocks projecting outward from the user. The diaper 420 also has a first elastomeric element 490 which is superposed and attached to a portion of the second region of the lower canvas 470, thus forming a first elastic zone 472 having a main direction of stretching in the lateral direction as indicated according to the arrow 473. In addition, the diaper 420 has a second elastomeric element 493 which is superimposed and attached to a portion of the third lower canvas region 480, thereby forming a second elastic zone 482 having a main stretch direction in a configuration non-linear (e.g., substantially "U" shaped) as indicated by arrow 483. In this manner, two elastomeric elements 490, 493 are used to create a first elastic zone 472 and a second elastic zone 482, respectively. The elastic zone 472 (ie, the second zone of the lower panel 470 combined with the elastomeric element 490) is located near the distal portion of the posterior region of the waist 438 to anchor the diaper 420 to the user's lower back, which it is discussed later. The elastic zone 482 (i.e., the third lower canvas region 470 combined with the elastomeric element 490) is located longitudinally inward of the elastic region 472 to provide molded elasticity within the region of the buttocks 439. In a non-exhaustive example , the absorbent core (not shown) is attached to the lower panel 426 in the third zone of the lower panel 480 along the longitudinal center line 1000 or in any way. In another non-exhaustive example, the absorbent core (not shown) does not extend into the second zone of the lower canvas 470. FIG. 6 is a plan view of yet another exemplary non-exhaustive embodiment of a diaper 520 of the present invention in its uncompacted and flattened state (ie, without induced elastic contraction) with the lower canvas 526, which contacts the wearer's garment , shown oriented towards the observer. Similar to FIG. 3, the diaper 520 has a first lower canvas area 560, a second lower canvas area 570 and a third lower canvas area 580. The first lower canvas area 560 is placed mainly in the crotch region 537 and the region of the front waist 536. The second area of the bottom panel 570 is located mainly in the rear region of the waist 538. The third zone of the bottom panel 580 is placed mainly in the front waist region 536. The third area of the bottom 580 canvas has a basis weight, thickness, or density lower than the second zone of the lower panel 570 which has a lower basis weight, thickness, or density than the first zone of the lower panel 560. The diaper 520 also has an elastomeric element 590 which is superposed and attached to a portion of the third zone of the bottom panel 580, thus forming elastic zone 582 having a main direction of stretching in the longitudinal direction as indicated by arrow 583. In this embodiment, persons experienced in the industry will recognize the the convenience of stretching the bottom panel in the longitudinal direction and that the path lengths of the bottom sheet area 580 and the elastomeric element 590 should also be measured in the longitudinal direction. The elastic zone 582 (i.e., the third zone of the lower panel 580 combined with the elastomeric element 590) is located in the front waist region 536 to facilitate variable stretching during the application of the diaper 520 given the varying lengths of the torsos the users. In a non-exhaustive example, the absorbent core (not shown) does not extend into the second zone of the lower canvas 570. In a non-exhaustive example, the absorbent core (not shown) is not attached to the lower canvas 526 in the elastic zone 582. A person skilled in the industry will understand that this particular embodiment can be used without the presence of the second lower canvas area 570 in the posterior region of the waist 560. FIG. 7 is a plan view of yet another exemplary non-exhaustive embodiment of a diaper 620 of the present invention in its non-collapsed and flattened state (ie, without induced elastic contraction) with the bottom sheet 626, which contacts the wearer's garment , shown oriented towards the observer. Similar to FIG. 3, the diaper 620 has a first lower canvas area 660, a second lower canvas 670 and a third lower canvas 680. The first lower canvas 660 is placed mainly in the crotch region 637 and the region of the front waist 636. The second area of the bottom sheet 670 is placed mainly in the distal portion of the posterior region of the waist 638. The third area of the bottom sheet 680 is placed mainly in the posterior region of the waist 638 with at least one portion extending into the buttock region 639. The third lower canvas area 680 has a lower basis weight, thickness, or density than the second lower canvas area 670 which has a basis weight, thickness , or density lower than the first zone of the lower panel 660. The third zone of the lower panel 680 is designed in such a way that it molds to the buttocks projecting outward from the user. The diaper 620 also has an elastomeric element 690 which is superposed and attached to a portion of the second region of the lower canvas 670, thereby forming distinct elastic zones 672 having a main direction of stretching in the lateral direction as indicated by the arrow 673 Elastic zone 672 (i.e., the second lower canvas region 670 combined with the elastomeric element 690) is located near the distal portion of the posterior ridging of the waist 638 to anchor the diaper 620 to the user's lower back, which is discuss later. The elastic zone 672 can be preferably aligned with the ears 697 and / or the fasteners 655 placed on the ears 697 to place a substantially continuous tension line around the waist to promote a continuous molded fit. As shown in FIG. 7, the elastic zone 672 preferably overlaps at least partially one of the two imaginary lines 656a and 656b that connect the longitudinally outward edges 655a and 655b of any of the fasteners 655. In embodiments in which the diaper 620 does not include fasteners 655, for example in diaper pants 720 of FIG. 8, the imaginary lines 656a and 656b can connect the edges of the narrower outward points 697a and 697b of the ears 697. In some embodiments, a straightening member can be used to further distribute the elongation force across all the ears 697. In these embodiments that include a straightening element that is wider than the fastener (not shown), the separation of the imaginary lines is defined by the longitudinal length of the hardening element. In a non-exhaustive example, the absorbent core (not shown) is attached to the lower canvas 626 in the third zone of the lower panel 680 along the longitudinal center line 1000 or in any way. In another non-exhaustive example, the absorbent core (not shown) does not extend into the second zone of the lower canvas 670. FIG. 8 is a plan view of a non-exhaustive example embodiment of a pant 720 of the present invention in its non-preformed, flattened, non-shrunken state (ie, without induced elastic contraction) with portions of the structure cut to show more clearly the underlying structure of the diaper 720 and with the portion of the diaper 720 contacting the wearer shown facing the viewer. The diaper 720 includes a longitudinal axis 1000 and a lateral axis 1100. An end portion 736 of the diaper 720 is configured as a front waist region 736 of the diaper 720. The opposite end portion 738 is configured as a posterior region of the waist 738 diaper 720. An intermediate portion 737 of the diaper 720 is configured as a crotch region 737, which extends longitudinally between the anterior and posterior regions 736 and 738. The waist regions 736 and 738 generally comprise the portions of the diaper 720 which, when The diaper is in use, they surround the user's waist. The waist regions 736 and 738 may include elastic elements such that they are gathered around the wearer's waist to provide better fit and containment. The crotch region 737 is the portion of the diaper 720 which, when the diaper 720 is in use, is generally placed between the legs of the wearer. Another intermediate portion 739 of the diaper 720 is configured as a breech region, which is located at or near the proximal end of the rear region of the waist 738. The outer periphery of the diaper 720 is defined by the longitudinal edges 714 and the edges from the ends 710, 712, which are located along the anterior and posterior waist region 736, 738, respectively. The first connection areas 757a, 757b are joined to the second connection areas 759a, 759b, respectively, before being acquired by the consumer (eg, before being packaged) as illustrated in FIG. 8. The diaper 720 is preferably applied to a user by inserting the user's legs through the leg openings and then the diaper 720 pulling up above the buttocks. It is contemplated herein and should be understood by those skilled in the industry that the present invention can be applied to a brief (e.g., FIG. 8) and an absorbent article not preformed (eg, FIG 1). In this manner, all of the embodiments described and contemplated herein are applicable to both underpants and non-preformed absorbent articles. FIG. 9 is a plan view of the non-exhaustive embodiment of the example diaper 620 of FIG. 7. FIG. 10a is a schematic cross-sectional view of the diaper 620 of FIG. 9, which is used as illustrated along line 10-10 in FIG. 11. For the purposes of FIG. 10a, the diaper 620 is illustrated as a diaper having a front fastening product embodiment which may or may not be preformed. The ears 697 are shown to have elastic properties in the lateral direction as indicated by arrows 698. It has been found that the diaper 620 provides better molding and continuous fit when a first elastic region (eg, the second area of the canvas) lower 670) having lateral resiliency as indicated by vector 673 is elongated together with a second elastic region (eg, ears 697) having lateral resiliency as indicated by vector 698 under the same tensile force. In this manner, the first stretch region (eg, the second zone of the bottom sheet 670) is stretched and shaped to the wearer before the second stretch region (eg, ears 697) is substantially stretched ( that is, stretched close to its limit, that is, stretched close to its maximum elongation); otherwise, the first region may wrinkle, open and / or begin to buckle. In practical terms, when the caregiver applies the diaper 620 with a certain application tension, the first elastic region must be lengthened together with the second elastic region instead of just beginning to elongate with the second elastic region instead of just beginning to elongate. when the second elastic region stretches near its limit. In the preferred embodiments, under a tensile load applied laterally between 1 N and 4 N, the stress on the second stretch region is between at least 10% and less than 75%. Under the same tensile load, the stress on the first stretch region is preferably greater than 5% and preferably greater than 10% and more preferably at least equal to the stress in the second stretch region. The co-elongation exhibited between the first and second regions can be imparted through a variety of configurations / product design techniques including, but not limited to, (a) varying the longitudinal length and / or the lateral width of the first and / or second elastic zone [p. eg, ears / side panels longitudinally higher compared to a longitudinally shorter area of the bottom canvas / elastic zone] and (b) varying the tensile modulus of the first and / or second elastic zone [p. For example, the traction module for the lower canvas area / elastic zone may be lower than the traction module for the ears / side panels]. Similar to FIG. 10a, FIG. 10b shows a diaper having a product that is held by the sides which may or may not be preformed, wherein, a first elastic region (eg, the second zone of the bottom sheet 770) having lateral resiliency as indicated by the elongated vector 773 together with a second elastic region (eg, side panels 797) having lateral elasticity 798 under the same tensile force. Although the term "ears" is used herein when referring to non-calf diapers and the term "side panels" is used herein when referring to pant diapers, the two terms may be used interchangeably herein when comprises the present invention. FIG. 11 is a side elevational view of the non-exhaustive example embodiment of a diaper 120 of FIG. 2 being used by a user 900. As illustrated in the same manner in FIG. 2, the bottom panel 126, the first zone of the bottom panel 160, the second zone of the bottom panel 170, the elastomeric element 190, the elastic zone 172 and the fastening element 155 are shown. FIG. 12 is a schematic side elevation view of the diaper 120 of FIG. 11. Reference is now made to FIGS. 11 and 12, the elastic zone 172 can be located at the rear end of the waist 136 of the diaper 120, generally located in the lower back waist area 910.

In this manner, maximum fit and comfort will be experienced by the user 900 as diaper 120 applies tension to the wearer's body at or immediately above the convexity of the buttocks 920 (i.e., the "shelf" of the buttocks). ), which contributes to the total anchoring capacity of the diaper 120 (ie, its ability to resist the fall). Stated another way, the elastic zone 172 functions to maintain the diaper 120 in an optimal fit configuration with respect to the low movement zone 930 (i.e. the line or area connecting the lumbar curve of the back on the chains to below). of the abdominal crease of the body of the user 900) to maximize the performance of this. For a more detailed discussion of low motion areas see U.S. Pat. no. 5,358,500. Test method to measure the elongation force 1. Connect the fastener components to the side of the article (eg, 759a and 757a in Fig. 10a). If the item is a preformed brief, then break a connection on one side of the item before the test. 2. Cut the article along the lateral axis 1100. 3. Make a couple of check marks (ie, data) both within the first stretch region and the second stretch region. Measure the lateral space for each pair of signal marks. 4. Grasp the opposite disconnected ends / clamping components in jaws at least as wide as the material to be clamped. The fasteners must be attached in such a way that a lateral pulling force can be applied to the first and second elastic regions between the clamps. 5. For a first iteration of the test, apply a tensile force 1 N and then, within about 15 seconds of applying said tensile force, measure the lateral space for each pair of check marks while the article is held between the jaws. 6. For a second iteration of the test, apply a total tensile force of 2 N and then, within about 15 seconds of applying said tensile force, measure the lateral space for each pair of check marks while the article is held between the jaws . 7. For a second iteration of the test, apply a total tensile force of 4 N and then, within about 15 seconds of applying said tensile force, measure the lateral space for each pair of check marks as long as the article is held between Jas gags. 8. Calculate the stress = [100 * (Distance rrm3i) - Distance (¡n¡c¡ai)) / Distance (¡n¡c¡ai)] for the first and second stretch regions for each iteration of the test. 9. Compare the tensions of the first and second stretch regions. The following relationship must be true for one of the three iterations of the test: The first elastic region is said to elongate together with the second elastic region when: (a) the deformation in the second elastic region is between at least about 10% and less than about 75% and (b) the deformation of the first elastic region is preferably greater than about 5%, more preferably greater than about 10%, and with a greater preference at least approximately equal to the deformation in the second elastic region. The second region may be extensible or more preferably elastomeric. The second region can be located in any portion of the frontal waist region 636 or the posterior region of the waist 638 including, but not limited to, a location near the longitudinal center line 1000 of said front waist region 636, laterally outwardly from the longitudinal center line 1000 near one or both longitudinal edges 614 in the waist region, or in the side panels 697 joined to one or more longitudinal edges 614 in one or more waist regions. All documents cited herein are considered incorporated in their relevant part as reference. The mention of any document should not be construed as an admission that it corresponds to a prior industry with respect to the present invention. While particular embodiments of the present invention have been illustrated and describedIt will be evident to those skilled in the industry that various changes and modifications can be made without departing from the spirit and scope of the invention. It has been intended, therefore, to cover all the changes and modifications within the scope of the invention in the appended claims. For example, a person with experience in the industry will understand that the present invention can also be incorporated into other usable absorbent articles, such as catamenial and adult incontinence products, that surround or enclose at least a portion of a user's anatomy or which are otherwise assured to a user. A person with experience in the industry should also understand that the elastic zones may be parallel or non-parallel with respect to the lateral or longitudinal center lines or with respect to each other. In addition, the elastic zones may have different physical and / or elastic properties versus each other. A person with experience in the industry should also understand that the elastomeric elements can be configured in any suitable manner including, but not limited to, linear or substantially non-linear (e.g., substantially "U", etc.). Although the illustrative embodiments described herein represented the third zone of the lower panel having a lower basis weight, thickness, or density than the second region of the lower panel which has a lower basis weight, thickness, or density than the first. In the lower canvas area, a person with experience in the industry should also understand that the backsheet and / or the first zone of the lower canvas may have lower values of the physical properties than the third zone of the lower canvas in some applications. For example, referring to FIG. 3, the second zone of the lower panel 270 (placed mainly in the distal portion of the posterior region of the waist 238) may have a weight of base, thickness or density lower than those of the third zone of the lower panel 280 (placed mainly in the region of the buttocks 239). In this way, the area of the second lower panel 270 provides greater breathability (ie greater air permeability) than the area of the lower third layer 280 thus providing better dryness and comfort in the region of the user's waist.; while the zone of the third lower canvas 280 is more adapted to ensure sufficient containment for the exudates. In another example, the third zone of the lower panel 280 may have a lower basis weight, thickness or density than those of the second rear sheet 270 to provide sufficient extension to allow for a brief application of the article (eg, for breeches). Although the illustrative embodiments described herein represent the second zone of the lower canvas, for example, which is positioned slightly away from the end edge 12 to provide less elasticity to maintain fit and shape, experienced persons in the industry will recognize that this separation (ie, detached placement) may vary in length, including non-existence. Although the physical properties of basis weight, thickness and density are discussed herein as methods for understanding and measuring the present invention, persons experienced in the industry will recognize that the tensile module can sometimes also be an acceptable physical property that can be measured. to understand the present invention. The tensile modulus differences can preferably be measured with the lower canvas deformed between 0% and 5% elongation of the lower canvas, or alternatively between 0% and 25%, or alternatively between 0% or 50%. All documents cited in the Detailed Description of the Invention are incorporated, in the pertinent part, as reference herein. The mention of any document should not be construed as an admission that it corresponds to a prior industry with respect to the present invention. While particular embodiments of the present invention have been illustrated and described, it will be apparent to those skilled in the industry that various changes and modifications can be made without departing from the spirit and scope of the invention. It has been intended, therefore, to encompass in the appended claims all changes and modifications within the scope of the invention.

Claims (10)

1. A disposable disposable absorbent article, characterized in that it comprises: An absorbent core having a garment facing surface and a body facing surface; a liquid permeable upper sheet positioned adjacent the surface facing the body of the absorbent core; a lower waterproof sheet positioned adjacent the surface facing the body of the absorbent core; the lower canvas has physical variation along at least one axis, where the physical variation defines a first lower canvas area and a second lower canvas area, where the physical variation is a measurable difference, where the physical variation is as measured by a physical property chosen from the group that includes base weight, thickness and density; and at least one elastomeric element has at least one main direction of stretching, the elastomeric element overlaps at least partially and joins the second zone of the lower canvas, wherein the relaxed path length of the elastomeric element in the main direction Stretch is less than the total path length of the lower canvas in the overlay region.

2. The absorbent article according to claim 1, further characterized in that the axis is a longitudinal axis.

3. The absorbent article according to claim 2, further characterized in that the first zone of the lower canvas and the second zone of the lower canvas partially overlap the longitudinal axis.

4. The absorbent article according to claim 1, further characterized in that the axis is a lateral axis. The absorbent article according to claim 1, further characterized in that the article further comprises: A front waist region; a region of posterior waist; the front and rear waist regions are located at opposite ends of the article, the front and back waist regions generally surround a user's waist when the article is used; a region of the crotch; The crotch region is located between the frontal and posterior waist regions; the crotch region extends longitudinally between the frontal and posterior waist regions; the crotch region is usually located between a pair of legs of the user; and a breech region; The crotch region is located between the frontal and posterior waist regions; The buttock region is located near a proximal end of the posterior waist region, where the first lower canvas area is placed mainly in the crotch region and the front waist region, where the second area of the canvas bottom is positioned at least partially in the posterior waist region. The absorbent article according to claim 1, further characterized in that the article further comprises: A front waist region; a region of posterior waist; the front and rear waist regions are located at opposite ends of the article, the front and back waist regions generally surround a user's waist when the article is used; a region of the crotch; The crotch region is located between the frontal and posterior waist regions; the crotch region extends longitudinally between the frontal and posterior waist regions; the crotch region is usually located between a pair of legs of the user; a region of buttocks; The crotch region is located between the frontal and posterior waist regions; the buttock region is located near a proximal end of the posterior waist region, wherein the first zone of the lower leg is placed mainly in the crotch region and the front waist region; wherein the second zone of the lower panel is located at least partially in the buttock region. The absorbent article according to claim 1, further characterized in that the physical variation is such that the second zone of the lower canvas has a lower value than that of the first zone of the lower canvas. 8. The absorbent article according to claim 1, further characterized in that the selected physical property is the basis weight; wherein the physical variation is measured as a proportion such that the ratio of the basis weight of the second zone of the lower canvas to the basis weight in the first zone of the lower canvas is at least 0.6. The absorbent article according to claim 1, further characterized in that a ratio of the relaxed path length of the elastomeric element to a total path length of the lower sheet within the second lower canvas area in a bonded area is less that approximately 0.8. 10. The absorbent article according to claim 1, further characterized in that it comprises a third zone of the lower canvas having a value for the physical property that is different from a corresponding value for the first and second zones of the lower canvas.