MX2008006893A - Absorbent articles with comfortable elasticated laminates - Google Patents

Abstract

A disposable absorbent article is claimed that comprised a backsheet and an absorbent core and a core coversheet or topsheet, that in use faces the wearer, and one or more cuffs (25, 26), comprising one or more longitudinally extending elastic laminate portion (s) (10), formed by at least an elastic material (12) attached to a supporting sheet (20) of said cuff (25, 26), said laminate portion (s) (10) comprising in at least relaxed and partially contracted state a body-facing surface with a multitude of wrinkles, and whereby said elastic laminate portion (10) has an absolute contracted length Lcand a fully stretched absolute length Ls, whereby at a partial elongation of the elastic laminate potion (10) ofε=0.5:a) said wrinkles have an average wrinkle height Hwof less than 600 micrometers;and b) said laminate portion (10) has an average wrinkle density Dwbetween 5 and 10 wrinkles per cm.

Description

ABSORBENT ARTICLES WITH COMFORTABLE ELASTIZED LAMINARS FIELD OF THE INVENTION This invention relates to disposable absorbent articles comprising leg folds or barrier folds (25, 26) comprising one or more elastic laminar portions (10) with (stretching) substantially in the "y" or longitudinal direction, formed of a material of support (20), and an elastic material (12) (and optionally a means of adhesion or adhesion canvas or strip of the cover (13)), where said elastic laminar portions (10) have wrinkles with a very low height and a selected average of the density of wrinkles, in order to reduce the risk of severe pressure marks. The elastic lamellar portions (10), preferably, are very thin. The supply of these elastic laminar portions (10) continues to provide an excellent strength profile for bending. In general, comfortable absorbent articles are obtained that have excellent leg seals that cause little or no pressure marking when worn.

BACKGROUND OF THE INVENTION Absorbent articles, such as baby diapers, training pants and adult incontinence garments, typically comprise elastic leg cuffs or barrier folds to reduce the leakage of exudates from the article. Often, they also comprise an elasticized waistband to improve fit and comfort when the wearer is in motion. These stretched portions of said articles, in general, comprise an elastic sheet material to a non-elastic canvas, such as a plastic film or a non-woven fabric material, which is obtained by joining the elastic material in the stretched state to the canvas. In this way, the resultant sheet comprises, in an unstretched, contracted and partially stretched state, a surplus of the wrinkle-forming canvas material. Said elasticized portions of the diaper may be uncomfortable in use, due to the pressure of the elastic portions on the skin or due to rubbing of the wrinkled elasticized portions on the skin. The inventors have also discovered that even if the user does not perceive the stretched portions as uncomfortable, the red marks on the skin caused by the stretched portions may still be perceived by the person caring for the user as uncomfortable for the latter. The inventors have discovered that this problem can be improved with the use of the elastic laminar portion (s) which, at least on the surface facing the body in use, has wrinkles of (on average) very small "z" dimensions (height), and that have a very selected wrinkle density (wrinkles per cm). It was found that these elastic laminar portions leave, at most, minimal and superficial pressure marks (wrinkle crevices) on the skin, which disappear very quickly and which are (perceived as) less obtrusive. Furthermore, if such minimal pressure marks are still formed, they are considered to cause less risk of skin irritation. They also discovered that it is beneficial for the elastic lamellar portions to be very thin, at least in the free edge area. In this way, the absorbent articles are provided so as to maintain an excellent elastic profile and performance; At the same time they do not present any, or almost none, pressure mark problems and that are more comfortable to use.

BRIEF DESCRIPTION OF THE INVENTION The invention relates to a disposable absorbent article comprising a lower canvas and an absorbent core and a cover canvas of the core or upper canvas, which when used is oriented towards the wearer, and to one or more folds (25, 26), which they comprise one or more longitudinally extending elastic laminar portions (10), formed by at least one elastic material (12) attached to the supporting canvas (20) of said fold (25)., 26), said laminar portion (s) (10) comprising (n), in at least a relaxed and partially contracted state, a surface facing the body with a multitude of wrinkles, and where said elastic laminar portion (10) has a contracted absolute length Lc and a fully stretched absolute length Ls, where in a partial elongation of the elastic sheet portion (10) of e = 0.5: a) said wrinkles have an average wrinkle height Hw less than 600 micrometers; and b) said sheet portion (10) has an average wrinkle density Dw of 5 to 10 wrinkles per cm. Said elastic sheet portion (10) has in an embodiment an average gauge (at 2.28 kPa (0.33 psi) and an elongation e = 0.5) of 0.4 mm (400 microns) to 1.3 mm, usually at 1.0 mm. The article is preferably a diaper, for example, an adult incontinence garment, a diaper for infants or toddlers, or training pants.

In addition, the inventors have discovered that pressure marks can result in skin irritation if pressure marks are caused by hydrophilic elastic material that may be wet when worn, because moisture can increase skin irritation. Thus, the inventors have discovered that it is beneficial to secure that supporting canvas material (20), for example, the nonwoven fabric material, which forms part of the sheet portions, which are hydrophobic. It may be preferred that the support canvas (20) is not elastically stretchable in the "y" direction. The elastic laminar portions as described herein may also be used as (part of) the elastic waistband or the elastic side panels. BRIEF DESCRIPTION OF THE FIGURES Figure 1 shows a perspective view of an illustrative diaper of the present invention; Figure 2 shows a top view of an illustrative diaper of the invention; Figure 3 shows a perspective view of the section of a support canvas (20), for example, the barrier fold canvas (26) as shown in Figures 1 and 2 with an elastic sheet portion (10). Figure 4 shows the results of the measurement, obtained with the method Cousins, which uses the Primos equipment and software, of a section of the elastic laminar portion (10), which shows the height and width of the wrinkles (and thence from the derived density). Figure 5 shows an illustrative adhesion pattern (adhesive) with adhesion adhesive areas (14) that can be used to adhere the elastic material to the support canvas material (20) or other material comprised in the elastic sheet portion, as described at the moment. Figure 6 shows an alternative adhesion (adhesive) pattern with adhesion areas (14) that can be used to adhere the elastic material to the support sheet material (20) or other material comprised in the elastic sheet portion, as described in FIG. the present.

DETAILED DESCRIPTION OF THE INVENTION The term "absorbent article" refers to devices that are worn, absorb or contain liquids and, more specifically, refer to devices that are placed against or in proximity to the user's body to absorb and contain the various exudates removed by the user. body. As used herein, the term "diaper" refers to an absorbent article that is generally worn by children and incontinent persons around the lower torso. The terms "elongation or stretching" in the "y direction" as used herein, mean that the fold (25, 26) or the laminar portion (10) have, on the whole, an elongation or stretch in an average direction, which in the present is termed as "address and". This can be a direction within 45 degrees of the longitudinal axis, or a line parallel to it, of the fold (25, 26) or of the elastic laminar portion (10). The "fully stretched absolute length" is the length of the fold (25, 26) or of the elastic laminar portion (10) when said fold (25, 26) or portion (10) is fully stretched in the "y" direction to its length maximum, as described herein. The "contracted absolute length" is the length of the fold (25, 26) or the elastic laminar portion (10), when no stretching force is applied to them, for example, when they are in a relaxed state, flattened on a surface. The "z-direction" is perpendicular to the "y" direction and extends substantially in the height direction of the wrinkles of the elastic laminar portion, and is referred to herein as a height or thickness dimension. The "x-direction" is perpendicular to the "x" and "y" directions. As used herein, the term "elastic" means that the article is extensible or stretchable by applying a force in a certain direction and returning to at least 80% of its original length, but less than 150% of its original length in that direction, and usually, to approximately its original size, after the stretching force has been released. As used herein, the term "along" means at least partially parallel and in close proximity, or even in contact. As used in this "attachment" includes "directly attached" and "indirectly attached", for example, by adhering "a" to "b" by adhering "a" to "c" and "c" to "b" . Each modality defined by certain properties or a certain dimension, for which a value is defined in the present, will be understood to include modalities with equivalent functional properties or dimensions, for example, a dimension of 0.5 cm should be understood as "approximately 0.5 cm". The disposable absorbent article of the invention may be a sanitary napkin, a pantyhose or a diaper, i.e., an adult incontinence garment or a baby diaper (as shown in Figures 1 to 5), or training pants. or brief-type diapers. The article comprises the fold (25, 26) with the support canvas (20) with an elastic laminar portion (10), which can be a leg fold (25) or barrier fold (26) and additional components, to have , generally, at least one lower canvas (21), absorbent core (23) and a cover canvas of the core or upper canvas. The absorbent article of the invention comprises at least one fold (barrier or leg) (25, 26), comprising at least one elastic laminar portion (10), formed by an elastic material (12) and a material of support canvas (20) which, in general, is not elastically stretchable, where said elastic laminar portion (10) has at least one stretch (elongation) in the "y" direction, or only a stretch in the "y" direction, as shown in the Figures. Generally, the article comprises at least a pair of opposed folds 25, (26) that are each positioned along a longitudinal side, and spaced apart from the "y" axis of the article. The article may also comprise other components. comprising an elastic laminar portion (10) such as elastic waistband (s) (25), or side panels. The longer dimension or length of the fold (25, 26) and of the elastic laminar portion (s) (10), are generally parallel to the "y" axis of the fold (25). , 26) and the article, and is, in general, practically parallel to the average stretch direction of the elastic lamella portion (10) and the fold (25, 26). Said fold (25, 26) may comprise more than one of the lamellar portions (10), each of which may or may not be identical. The fold (25, 26) may consist of a supporting canvas material (20) and of (l) (the) elastic material (s) (12) or may comprise other components, such as, for example. adhesion, such as adhesive adhesion canvases (14) etc., cover strips (13). A disposable absorbent article of the preferred invention is a diaper, which includes adult incontinence garments, training diapers or briefs, infant or infant diapers with fasteners (as shown in the figures) which may comprise an absorbent core ( 2. 3); a cover canvas of the liquid-permeable core or upper canvas in the absorbent core (23); a lower waterproof canvas (21); side panels (elastic) (27), leg folds (elastic) (25), elastic waist elements (24), and a fastening system (28). The article illustrated in Figure 1 has a first waist region, a second waist region opposite the first waist region, and a crotch region located between the first waist region and the second waist region, each of which it is approximately 1/3 of the length of the article. In preferred embodiments, the bottom sheet (21) is impervious to liquids (e.g., urine) and comprises a thin plastic film, such as a thermoplastic film having a thickness of about 0.012 mm (0.5 mil) to about 0.051 mm (2.0 mil). Suitable lower canvas films include those manufactured by Tredegar Industries, Inc., of Terre Haute, IN, which are sold under the trade names of X15306, X10962 and X10964. Other suitable bottom sheet materials may include permeable materials that allow the vapors to exit the article, while preventing the exudates from passing through the bottom sheet. Illustrative permeable materials may include materials such as woven wefts, non-woven fabric webs, composite materials such as nonwoven fabric webs with coating film, microporous films. The cover canvas of the core or upper canvas is preferably moldable, soft to the touch and non-irritating to the wearer's skin. In addition, at least a portion of the core cover canvas is permeable to liquids, which allows liquids to be absorbed by the absorbent core (23) below. A suitable core cover canvas can be manufactured from a wide range of materials, such as porous foams, cross-linked foams, plastic films with holes or woven or non-woven fabric materials of natural fibers (eg, wood fibers or wood fibers). cotton), synthetic fibers (eg, polyester or polypropylene fibers) or a combination of natural and synthetic fibers. If the core cover sheet includes fibers, these may be spunbonded, carded, wet-laid, blown-fused, hydroentangled, or may be processed in any other way known in the industry. Any portion of the core cover canvas or the top sheet described herein may be coated with a lotion, as is known in the industry. Some examples of suitable lotions include those described in U.S. Pat. no. 5,607,760, entitled "Disposable Absorbent Article Having A Lotioned Topsheet Containing an Emollient and a Polyol Polyester Immobilizing Agent" (Disposable absorbent article with a lotion top canvas, containing an emollient and a polyolpolyester immobilizing agent), issued to Roe on March 4, 1997. The lotion may work alone or in combination with another agent such as the hydrophobicizing treatment described above. . The core cover canvas or the top canvas may also include or be treated with antibacterial agents, of which some examples are described in the PCT patent publication no. WO 95/24173, entitled "Absorbent Articles Containing Antibacterial Agents in the Topsheet For Odor Control", (published on September 14, 1995 in the name of Theresa Johnson), (Absorbent Articles Containing Antibacterial Agents in the Upper Canvas to Control Odor).

The absorbent core (23) may comprise any absorbent material that is generally compressible, moldable, non-irritating to the wearer's skin and capable of absorbing and retaining liquids, such as urine and other body exudates. The absorbent core can be manufactured in a wide variety of sizes and shapes (eg rectangular, hourglass-shaped, "T" -shaped, asymmetric, etc.) and can comprise a wide variety of liquid-absorbing materials which are commonly used in disposable diapers and other absorbent articles, such as crushed wood pulp, which is generally referred to as air felt, and preferably at least super absorbent polymers or absorbent gelling materials; or any other known absorbent material or combinations thereof. It may be preferred that the absorbent core comprises at least 80% by weight (based on the total content of material in the core, which excludes the core wrap or cover canvas) of the super absorbent polymer or the so-called absorbent gelling material. The article may also include a fastening system (28) that holds the first and second region of the waist in a configuration such that it allows to supply lateral stresses around the circumference of the article to hold it to the user. The fastening system (28) preferably comprises a surface fastener such as tape tabs, hook and loop fastening components, or hermaphroditic fastening components, although any other known fastening means are generally acceptable. In alternative embodiments, opposite sides of the article may be sewn or welded to form a brief. This allows the diaper to be worn as a brief-type diaper or training pants. The training pants are placed in position on the user by introducing the user's legs into the leg openings and sliding the training pants into position around the user's lower torso.

The article may also comprise side panels (27) that are preferably resilient extensible and may comprise the elastic sheet portion (10) as described herein, to provide a more comfortable and contoured fit that is better suited to the body by initially molding the body. article to the user and maintain this adjustment for the entire duration, even long after it has been loaded with body exudates, since the elasticized or stretchable side panels allow the sides of the article to expand and contract.

Folds (25, 26) with the elastic laminar portion (s) (10) The fold (25, 26) of the present invention comprises at least one elastic sheet portion (10), as described in FIG. I presented. It is preferred that the article comprises at least two folds (25 or 26) as also shown in Figures 1 and 2. Each sheet portion (10) is in a relaxed / contracted state and in a partially stretched state that includes an elongation e of 0.5, as described hereinafter, at least one surface with wrinkles facing the user's body and may be in contact with the skin when used. The elastic sheet portion (10) may comprise two or more (preferably without elastic) canvases of material that are attached to both surfaces of an elastic material, and the laminar portion containing, generally, wrinkles on both surfaces of the elastic laminar portion. The properties of said wrinkles described herein apply at least to the wrinkles of the body-facing surface of the elastic sheet portion (10), but can be applied to both surfaces of said sheet (10). At an elongation e of 0.5, where e = (Lx- U) / U), these wrinkles are of average height (measured by the "Cousins" method described below, using a PRIMOS equipment) less than 600 microns, and, generally, less than 600 but greater than 200 microns, or between 550 microns and 300 microns, or up to 530, or even up to 500 microns. An Illustrative Measurement Graph Cousins of a section of an elastic sheet portion (10), as presented by the test method of the present, is shown in Figure 4. At an elongation e of 0.5, the elastic lamellar portions (10). ) of the present may have an average wrinkle density (wrinkles per cm) of 5 to 10 wrinkles per cm or even 6 to 10, or even 7 to 10, or possibly only up to 9 wrinkles per cm, as measured with the Primos method described below. The elastic lamellar portions (10) of the invention have a maximum average elongation emx, (where (Ls-Lc) / Lc where Ls is the fully stretched length of the elastic sheet portion), of at least 0.8 or still greater preference of at least 1.0 or still more preference of at least 1.2, or may be at least 1.4. These values can be obtained by the method described in the following methods section. It should be understood that the fold (25, 26) may comprise areas (typically, between 0.5 and 2 cm, or 0.8 and 1.5 cm) where an elastic material is attached to the supporting canvas material without providing in that area, no elongation of at least 0.5, and then possibly there will be no wrinkle present. It should be understood as a purpose of the invention that said areas where the elastic material is present but that have an elongation of less than 0.5 are not considered part of the elastic laminar portion (10) of the present. Said areas may be referred to herein as "adhesion portions". In order to determine and obtain the elongation e = 0.5 of the elastic laminar portion (10), the absolute contracted length of the elastic laminar portion (10) U is first determined in the following manner. The fold (25, 26) is removed with the elastic laminar portion (10) of the absorbent article, or if possible the elastic laminar portion (10) of the article is removed, either of the two forms in such a way that the profile does not change of the wrinkles and the profile of the elastic (that is to say, of the surface facing upwards which is oriented towards the body of the user during use). The fold (25, 26) or the elastic laminar portion (10) is placed as flat as possible on a surface, without applying any elongation or stretching force. Then, the absolute contracted length of the elastic laminar portion (10) of the fold (25, 26) is measured. In the present, this is called the absolute length contracted from the laminar Lc. Then, the length of the laminar portion (10) at e = 0.5 can be calculated, being 1.5 Lc (based on: e = (Lx- U) / C.).

Subsequently, the sheet portion (10) can be stretched by the method described below to obtain this elongation from 0.5 to 1.5 U. Then, the height of the wrinkles, the height and average deviations of the wrinkles, the width of the wrinkles, Wrinkles, the distance between the wrinkles, the density and the average deviation of the wrinkles, can be calculated by using the Primos method, using PRIMOS equipment, as described below. Generally, the elastic sheet portion (10) has wrinkles of a practical or relatively uniform height (distribution), at least on the body-facing surface of the elastic sheet portion (10). For example, less than 10% or preferably less than 5% of the wrinkles are 800 microns or more, preferably less than 10% or even less than 5% of the wrinkles are 700 or more, or even 650 microns or more; and it may even be possible that 95% or more, or even all wrinkles (approximately 100%) have a height of less than 600 microns. In addition, it may be preferred that the density of the wrinkles be substantially uniform over the entire elastic sheet portion, for example, that in no 2 cm section (longitudinally, along the sheet portion) the density of the wrinkles be greater than 12 and that in any 2 cm section (in the longitudinal direction, along the laminar portion) the density of the wrinkles is less than 3, or less than 4. It is preferred that in each 2 cm section of a laminar portion (10), the wrinkle density is between 5 and 10, or any of the preferred values described above. The width of the elastic laminar portions (10) will vary, generally, according to the exact dimensions of the fold (25, 26) or of the article. For example, for diapers with size 4 the elastic laminar portion (10) in a fold (25, 26) of the present can, in a fully stretched state, have an average width of approximately 1 to 3 mm. The elastic materials (12) used herein, are generally very thin, with a thickness or gauge (eg, gauge) of, generally, up to about 200 microns, or even up to 150 microns or even up to 1 10 microns, or up to 100 microns and may have to be at least 20 microns, more preferably at least 40 microns, or even at least 60 microns, as defined herein. The materials with greater preference have a thickness of approximately 70 to 100 microns. A suitable elastic material is for example 2L-89, distributed by Fulflex, (Limerick, Ireland). The present article, in general, has a pair of barrier folds (25, 26) with the elastic laminar portions as described herein which are, generally, reflections of images, with each other, in the "y" axis, as shown in Figures 1 and 2. The barrier folds (26) may be attached to the leg cuffs (25), lower canvas or top canvas in conventional ways, known in the industry. It may be preferred that the barrier folds (26) comprise each two elastic laminar portions which are apart apart transversely, and both generally extend parallel in the direction of stretching. These may or may not be elastic sheet (s) (s) (10) as described herein, however, generally, at least the transverse external elastic sheet portion (10) is as described in FIG. the present. The article may comprise, alternatively or in addition, a pair of leg folds (25) with the elastic laminar portion described herein, which are, generally, image reflections, one with the other, on the "y" axis. . The free longitudinal (outer) edge of the elastic sheet portion (10) or even the sheet portion (10) or fold (25, 26) as a whole may have an average gauge (at a pressure of 2.28 kPa (0.33 psi) and a elongation of 0.5) of 1.1 mm or less, or 1.0 mm or less, or 0.95 mm (950 microns) or less, and may be greater than 0. 4 mm (400 microns) or even, for example, greater than 0.6 mm (600 microns), as measured by the method described hereinafter. For this, the elastic laminar portion (10) may comprise one or two (lamellar) layers having a grammage of 20 g / m2 or less, preferably one or two layers (laminar) of a grammage of 17 g / m2 or less; as long as if two layers (laminar) are present, their combined basis weight can be, preferably, 34 g / m2 or less. The fold (25, 26) can also be made of two layers (laminar), with the between, in certain area (s), the elastic material (eg, also called sandwich structure); as shown, for example, in Figure 3. Then, for example, the fold (25, 26) can be made from a single layer (laminar) of eg a grammage of 20 g / m2 or less, or one or two layers (laminar) of a grammage of 17 g / m2 or less. The fold (25, 26) as a whole may, in general, have an average gauge that is the same or smaller than the caliber of the sheet portion (10). The fold (25, 26) and the elastic sheet portion (10) herein can comprise any suitable canvas material to be laminated to an elastic material (12). Preferably, the fold canvas material (25, 26) and the sheet portion (s) (10) is not stretchable elastically in the "y" direction itself. Preferably, the fold (25, 26) is permeable to air. In certain embodiments herein, it may be preferable that it has high barrier properties.

The fold (25, 26) and the elastic sheet portion (10) is preferably hydrophobic or impermeable to urine. The supporting canvases (20), folds (25, 26) and preferred elastic laminate (s) (10), comprise woven and non-woven fabric materials of natural fibers (eg, wood). or cotton fibers) or synthetic fibers. These preferably comprise thermoplastic polymer fibers, preferably selected from the group comprising: polyolefins, polyesters, polyurethanes and polyamides, most preferably thermoplastic polymers such as a polyolefin, most preferably polypropylene or polyethylene. The fibers can be spun-bonded, carded, wet-laid, blow-molded or hydroentangled, or processed in any other way known in the industry. It is preferred that the fold (25, 26) and the sheet portion (10) thereof comprise one or more canvases of non-woven fabric material which is, in itself, a laminate of meltblown and carded melts or web material. union by spinning. For example, a canvas or fold layer (25, 26) can be a laminate of at least two layers, one of which is at least one melt-blown layer (M) and one of which is therefore minus one spun bond (S) or one card layer (C). Preferred embodiments are non-woven fabric laminates SM, SMS, SMMS, SSMS, SSMSS, SSMMS, CM or CMC. Most preferably, said non-woven fabric webs are formed with polyethylene, polypropylene or polybutylene polymer fibers or (a mixture thereof) polyethylene, polypropylene or polybutylene copolymer fibers; more preferred are polypropylene polymer fibers. It may also be preferable that the fold (25, 26) comprises ingredients that reduce friction between the user's skin and the fold (25, 26), or in particular between the skin and the elastic laminar portion (10). For this, the lamellar portion (10) or the fold (25, 26) may comprise, for example, a lotion, a fine powder, such as talc or wax. The fold (25, 26) or the sheet portion (10) can be treated with an agent to reduce its surface energy. For example, the useful agent includes fluorocarbons as described in U.S. Pat. no. 5,876,753, issued to Timmons et al. on March 2, 1999; the U.S. patent no. 5,888,591 issued to Gleason et al. March 30, 1999; the U.S. patent no. 6, 045,877 issued to Gleason et al. on April 4, 2000. Other agents include silicone. Useful methods for applying the agent to the material, without reducing the air permeability, can be found in U.S. Pat. no. 5,322,729 and the PCT publication of WO 96/03501. Preferred agents can be selected from the group consisting of fluorocarbons, siloxanes, polysiloxanes, which preferably include fluorinated monomers and fluorinated polymers, including hexafluoroethylene, hexafluoropropylene and vinyl fluoride and vinylidene fluoride, fluoroacrylate and fluoromethacrylate. It is preferred that the fold (25, 26) is provided with poly (tetra) fluoroethylene, fluorinated copolymers of ethylene propylene or fluorinated copolymers of ethylene-tetrafluoroethylene. The fold (25, 26) with the elastic laminar portion (10) or the laminar portion (s) (10) of the present are such that, in general, they have one of the following elastic profiles: a ) 1.5 Lt for a first load force less than 1.1 N, or even less than 0.6 N, 3.0 Lt for a first load force less than 2.1 N, or even 1.1 N, and 4.5 Lt for a first load force less than 3.0 N, or even less than 1.5 N; and a second discharge force at 4.5 Lt greater than 0.9 N, a second discharge force at 3.0 Lt greater than 0.5 N and a second discharge force at 1.5 Lt greater than 0.1 N. (Said elastic profile obtainable by the method described in the co-pending application EP1201212-A, where Lt is the contracted length of the fold (25, 26) or the elastic laminar portion (10), independently applicable, referred to herein as Lc). or: b) 0.25 Ls for a first load force less than 0.6 N, 0.55 Ls for a first load force less than 5 N, or even less than 3.5 N, and 0.8 Ls for a first load force less than 10.0 N , or even less than 7.0 N; a second discharge force at 0.55 Ls greater than 0.4 N, and a second discharge force at 0.80 Ls greater than 1.4 N, or even greater than 2.0 N. (Said elastic profile obtainable by the method described in the copending application EP1201212-A , where Ls is as specified herein, the fully stretched length of the elastic sheet portion (10), or fold (25, 26) being independently applicable.) Preferably, the fold (25,26) or the elastic sheet portion (10) has a force profile with a first loading force, at an elongation of 200%, of 1.6 N or less, and a second discharge force, at an elongation of 200%, of 0.5 N or more. The elastic material (12) can be attached to one or more supporting canvases or layers or non-woven fabrics that form the elastic laminar portion (10) or, generally, the fold (25, 26), by any method, including the adhesive and ultrasonic bond, but the use of the adhesive may be preferred. The adhesive can be applied in such a way that the density and height of the necessary wrinkles are achieved, as also claimed herein. It is preferred that the elastic material (12) be attached to the support sheet material (20) comprised in the elastic sheet portion by the use of a specific pattern which is suitable to obtain the densities and heights of the wrinkles referred to herein, said pattern having provided areas of adhesion (14) and non-adhesion therein, as, for example, shown in Figures 5 and 6. It may be preferred that the elastic sheet portion (10) have, in fully stretched absolute states with length Ls , areas of adhesion (14) practically transverse in such a way that the average distance between the adjacent transverse parts of (l) (the) area (s) of adhesion (14) is from 0.3 mm to 2.5 or 2.0 mm, or preferably from 0.6 to 1.2 mm. It may be preferred that the average width (substantially in the direction of stretching) of the transverse portions (in the elastic sheet portion (10) in such a fully stretched state), is from 0.2 mm to 1.2 mm, or preferably from 0.3 mm to 0.8 mm. or even 0.5 or less. It may be preferred that the ratio of the average width of the adhesion portions transverse to the average distance between said adhesion portions (ratio Rad is? Vo) is from about 4:10 to 8:10 or 6:10, or for example about 1. For example, the adhesion means may include a uniform continuous adhesive layer, a patterned adhesive layer or a series of separate lines, spirals, omega-shaped line (s) or adhesive spots. The adhesive may, for example, be applied in an intermittent strip pattern, preferably straight strips which are positioned in (substantially) transverse direction along the elastic sheet portion, for example, substantially perpendicular to the longitudinal direction of the elastic sheet portion. (10), as shown in Figure 5. It may be preferred that the average distance between the adjoining adhesive strips (as shown in the adhesion area (14), as also shown in Figure 5) is 0.3 mm to 2.5 or even 2.0 mm, or preferably 1.5 mm, or even 0.6 to 1.2 mm. It may be preferred that the strips have on average a width (in the direction of stretch "and") less than 1.2 mm, preferably 0.3 to 0.8 mm., or even 0.5 mm or less. It may be preferred that the ratio of the average width of the strips to the average distance between the adjoining strips (ratio R of the adhesive) is from about 4:10 to 8:10 or 6:10, or for example, about 1: 2 The adhesive it can also be applied in a pattern called omega, as shown in Figure 6, where each omega-shaped part has a "circuit", with an ascending "leg" and a "leg" descending, starting from and reaching an average of "initial values". By this means, the omega line, itself, can have an average width as described above for the width of the adhesion areas (14) and the distance between the "adjoining legs of an adjoining circuit or circuits" can be as follows. described above for the distance between the adhesion areas (14) (and then each "leg" is considered an adhesion area (14); or the distance between the adjoining "circuits" can be as described above for the distance between the adjoining adhesion areas (14) and the average width of a circuit can be as described above for the average width of an adhesion area ( 14) (and then the circuit as a whole is an adhesion area (14)). In both cases, the adhesive R can also be like the previous one. The article may also comprise an element or waistband (24) or side panels (27) comprising one or more elastic laminar portions (10) as described herein. Then, the direction of stretching (referred to as "and" in the present) is perpendicular to the "and" direction of the article. The side panels (27) may be comprised between and attached to the waistband (24) and to the fasteners, or to two waistband portions (24). Then, the side panels or waistband are also extensible with an extension of at least 0.8, as described above.

Test methods: Method for stretching the elastic laminar portion (10) to an elongation of e = 0.5; Method for determining the fully stretched length Lg v em¿v The elastic sheet portion (10) can be straight, curved or can comprise several straight parts joined under one or more angles to each other, as can be seen in Figures 1 and 2, or You can have a combination of these configurations. In the present, this is referred to as the "straight", "curved" or "angled" elastic sheet portion (10), respectively, or for example, "curved and angled" elastic sheet portion (10), etc. In each of the following cases, a sample (eg, fold (26) or preferably an elastic laminar portion thereof, if it can be isolated) is obtained from an absorbent article that has been conditioned for 24 hours at 50% humidity and at 23 ° C. 1) When the elastic laminar portion (10) is straight: The elastic laminar portion (10) or fold (25, 26) is obtained as a whole and placed on a flat surface, as described above, to measure the contracted length of the elastic laminar portion (10) - The elastic laminar portion is subsequently stretched to 1.5 Lc (equal to e = 0.5) or up to its fully stretched length Ls, to determine emáx in the following manner. The sample (the fold with the elastic laminar portion or the elastic laminar portion thereof) is left for 24 hours at 25 ° C and at 50% humidity, before the next elongation / stretch step, which is subsequently carried out under the same conditions . The measurement of the length of the samples can be done with a thread of one micrometer. The sample to be tested is placed longitudinally (in the direction of stretching) between two clamps or, if the width of the sample is greater than 1 cm, between two clips of a width of 1 cm, one at each end, in such a way that the contact area of the clamps / clamps and the sample is at most 1 mm for the clamps and 0.5 mm for the clamps in the direction of the stretch (length). The exact distance between the beginning of one fastener or clamp is measured at the beginning of the other fastener or clamp. This is the contracted length of the sample, for example, of the laminar portion. For straight samples, the clamps or clamps move in the "y" direction of the length of the straight samples, such that the direction of the length is the direction of the elongation force. In this way, the sample can be stretched to a maximum elongation (eg, when the bend (25, 26) reaches its maximum length) and the length of the sample and the distance between the fasteners are measured and the elongation is calculated emx. Alternatively, the sample is stretched to e = 0.5, in order to subject this stretched sample to the Primos method described below. 2) When the elastic laminar portion (10) is "angled": The elastic laminar portion (10) is divided by marking with a thin marker the straight parts (ie, between the angles), for example, in 3 straight parts. The sample is prepared and conditioned as described above. Subsequently, each straight part is lengthened separately by the method described above for the straight elastic lamellar portions (10) up to e = 0.5 or emax, for example when the sample comprises two angles and 3 straight parts, 3 lines of force are determined and The sample is stretched 3 steps. 3) When the elastic sheet portion (10) is "curved": The curved elastic sheet portion (10) is divided with a thin marker into sections of 2 cm absolute length and possibly a remaining section of shorter length. The sample is prepared and conditioned as described above. Prior to elongation, the line of force of each 2 cm section (or a section less than 2 cm) is determined as follows. Each section has two lines of transverse edges that are 2 cm apart and each transverse edge line has a center point. A line can be drawn through the two lines of transverse edges. This will be the "line of direction and" or line of force along which force will be applied to lengthen the section. This will be done for each section. Later, each section is elongated separately from the shape described above for the straight elastic lamellar portions (10), but separately lengthening each section along its own line of force, ae = 0.5 or its maximum elongation emax After stretching of all the sections, a fully stretched absolute length can be measured for each section and for the elastic sheet portion (10), Ls, and emax can be calculated. 4) Mixed elastic laminar portion (10) If the elastic laminar portion (10) comprises a combination of curved, angled or straight parts, therefore, a combination of the above methods is applied.

Cousins Method: Determination of the averages and deviations of the height and density of wrinkles. Next, the method for determining the height and density of the wrinkles of the sheet portion (10) of the fold (25, 26) is described. Each sample with the elongation of 0.5 as defined and obtained by the method described herein, it is examined by using PRIMOS equipment and data capture software, following the manufacturer's instruction manual, using a 13x18 mm lens. If the elastic sheet portion (10) has an average width greater than 3 mm, the above measurement is made only 70% of the inside width of the sheet portion, along its length. The PRIMOS team will provide graphs per measured section of the sample, as shown in Figure 4, and provide exact values per wrinkle, eg, height, width; and it allows to calculate the average of wrinkles per cm, height of wrinkles, deviations, etc.

Gauge Measurement The gauge and average gauge of an elastic laminar portion (10) having an elongation of e = 0.5, as described herein, can be obtained by the use of a micrometer, such as the Frank 16303, which can obtained from Twing Albert-Frank GmbH. The test is carried out at 23 ° C, 50% humidity. The sample must already be conditioned to this humidity and temperature as described above, since it has been exposed for 24 hours to these conditions, before stretching to the necessary elongation of 0.5, for this caliber test. The equipment is calibrated before the test. The deceleration speed for the pressure foot is set at 3 mm / sec and the residence time is 2-5 sec. The size (surface area) of the anvil is chosen depending on the size of the elastic sheet portion (10) and subsequently the weight on the pressure foot is chosen such that the necessary pressure of 2.28 kPa (0.33 psi) is obtained. For example, an anvil with a diameter of 40 mm is used and a total weight of 295 grams (80 grams of pressure foot plus an additional grams) to measure the elastic laminar portion (s) (10) preferred in the present. To obtain the average caliber of the elastic sheet portion, the test is repeated in several portions thereof, so that the areas pressed by the measuring anvil do not overlap. Later, an average can be calculated. In addition, the deviation in the caliber can be calculated. All documents cited in the detailed description of the invention are incorporated, in their pertinent parts, herein by reference; the citation of any document should not be construed as an admission that constitutes a precedent industry with respect to the present invention. To the extent that any meaning or definition of a term in this written document contradicts any meaning or definition of the term in a document incorporated by reference, the meaning or definition assigned to the term in this written document shall govern. While particular embodiments of the present invention have been illustrated and described, it will be apparent to those with experience in the industry that various changes and modifications can be made without departing from the spirit and scope of the invention. Therefore, it has been intended to cover in the appended claims all changes and modifications that are within the scope of the invention.

Claims (10)

1. A disposable absorbent article comprising a lower canvas and an absorbent core and upper canvas, which when worn is oriented towards the wearer, and to one or more folds (25, 26), comprising one or more elastic laminar portions extending longitudinally ( 10), formed by at least one elastic material (12) attached to the supporting canvas (20) of the fold (25, 26), the elastic laminar portion (s) (10) comprising (n), in at least a relaxed and partially contracted state, a surface facing the body with a multitude of wrinkles, and characterized in that the elastic laminar portion (10) has an absolute contracted length U and an absolute length fully stretched Ls , whereby at a partial elongation of the elastic laminar portion (10) of e = 0.5: a) the wrinkles have an average height Hw of less than 600 micrometers; and b) the sheet portion (10) has an average wrinkle density Dw of 5 to 10 wrinkles per cm. An absorbent article according to claim 1, further characterized in that the elastic sheet portion (10) has an average gauge (at 2.28 kPa (0.33 psi) and an elongation e = 0.5) of 0.4 mm to 1.1 mm, or even to 1 mm 3. A disposable absorbent article according to claim 1 or 2, further characterized in that the elastic sheet portion (10) comprises one or two non-woven sheet fabrics (20), each having a grammage of 22 g / mm2 or less, preferably 20 g / m2, 17 g / m2, or 13 g / m2, preferably having only one or two laminar canvases of nonwoven fabric (20) each with a grammage of 17 g / m2 or less. 4. A disposable article according to any of the preceding claims, characterized in that it further comprises a pair of barrier folds (26) or leg folds (25), preferably, at least barrier folds (26), wherein a The elastic laminar portion (10) is positioned, and extends longitudinally, along the outer edge of each fold (25, 26). A disposable absorbent article according to any one of claims 1 to 4, further characterized in that the elastic is attached to the fold (25, 26) by using an adhesive that is applied in the form of an omega pattern with transverse circuit parts which provide transverse adhesion areas (14), or in the form of intermittent transverse adhesion areas (14), whereby in a fully stretched state Ls, the average distance between adjoining transverse adhesion areas (14) is between 0.3 to 2.2 mm, or between 0.6 and 1.2 mm. A disposable absorbent article according to any claim 5, further characterized in that the average width (in the fully stretched state, in the "y" direction) is between 0.3 mm and 0.8 mm, preferably 0.5 mm or less, or the ratio between the wide and the average distance is 4:10 to 8:10 or 6:10, or preferably 1:

2. 7. A disposable absorbent article according to any of the claims, further characterized in that the fold (25, 26) or elastic sheet portion (10) is hydrophobic, preferably having a surface energy of less than 0.0003 N / cm ( 30 dynes / cm), or even less than 0.00027 N / cm (27 dynes / cm). A disposable absorbent article according to any of the preceding claims, further characterized in that the fold (25, 26) has a force profile having a first loading force at an elongation of 200% of 1.6 N or less, and a second discharge force at an elongation of 200% of 0.5 N or more. 9. A disposable absorbent article comprising a fold (25, 26) comprising one or more elastic laminar portions (10) extending longitudinally; formed by at least one elastic material (12) attached to the supporting canvas (20) of the fold (25, 26) with adhesion area (s) (14) containing substantially transverse adhesion portions (perpendicular to the direction of stretching), the laminar portion (s) (10) comprising (n), in at least a relaxed and partially contracted state, a surface facing the body with a multitude of wrinkles, and characterized in that the portion elastic laminate (10) has an absolute contracted length Lc and an absolute length fully stretched Ls, and therefore: either a) in the fully stretched state the average distance between the adjacent transverse parts of (l) (the) area ( s) of adhesion is from 0.3 to 2.2 mm, or preferably from 0.6 to 2.2 mm or even 1.2, and therefore the average width (practically in the direction of the stretch), of the transverse parts (in the fully stretched state) , it is 0.3 mm to 1.2 mm, or 0.5 mm; or b) the ratio between the width and the average distance is 4: 10 to 8: 10 or 6: 10, or preferably approximately 1: 2. 10. A disposable absorbent article comprising a lower canvas and an absorbent core and an upper canvas that when used it is oriented towards the user, and a waistband (24) or side panel (27) comprising one or more elastic laminar portions (s) (10); formed by at least one elastic material (12) attached to the supporting canvas of the waistband (24) or side panel (27), the elastic laminar portion (10) and waistband (24) or side panel (27) having stretch in it. a region perpendicular to the "y" direction of the article, characterized in that a laminar portion (s) (10) comprises (n) in at least a relaxed and partially contracted state, a surface facing the body with a multitude of wrinkles, and whereby the elastic laminar portion (10) has an absolute contracted length (in the direction of stretching) and an absolute length fully stretched Ls, whereby to a partial elongation of the elastic sheet portion ( 10) of e = 0.5: a) the wrinkles have an average height Hw of less than 600 microns; and b) the sheet portion (10) has an average wrinkle density Dw between 5 and 10 wrinkles per cm.