MXPA96006408A - Absorbent member with impregnation strips, absorbent, high densi - Google Patents

Abstract

The present invention relates to an absorbent article comprising a fluid-permeable topsheet, a fluid-impermeable backsheet, and an absorbent core disposed between the topsheet and the backsheet, said absorbent core having a density and characterized in that it comprises: an absorbent medium comprising a first fibrous web, and a plurality of impregnation strips distributed throughout an entire length, width, and thickness of the absorbent medium, each strip comprising a second fibrous web having a density greater than the density of the absorbent core and comprising a material selected from the group consisting of paper, tissue, and nonwoven materials, more than half of the impregnation strips being in physical contact with at least one other impregnation strip, and at least 50% of one area of the projected plane of x / y of said absorbent core being covered by said impregnation strips n, wherein the projected plane x / y is defined by a line oriented in a "x" direction along the length of the absorbent core and a line oriented in the "y" direction along the width of the absorbent core, more than half of the impregnation strips being within a width of another of said impregnation strip in said projected plane x

Description

ABSORBENT MEMBER WITH STRIPS OF IMPREGNATION. ABSORBENTS. HIGH DENSITY FIELD OF THE INVENTION This invention relates to absorbent structures useful for absorbing exudates from the body. This invention also relates to absorbent articles, such as diapers and sanitary napkins, for which absorbent structures are particularly useful.

BACKGROUND OF THE INVENTION Absorbent articles, such as disposable diapers, adult incontinence pads, sanitary napkins and the like, are generally provided with absorbent members to receive and retain body fluids. Said absorbent members frequently comprise fibrous web structures, which are made of entangled masses of fibers. For such absorbent articles to function efficiently, the absorbent members must rapidly acquire body fluids into the structure from the point of application and subsequently distribute body fluids within and through the absorbent member to provide maximum liquid containment. Previous attempts to distribute the liquid in and through the absorbent member have often utilized continuous fibrous impregnation layers, or impregnation zones, within the absorbent member, which have a greater density than the rest of the absorbent member. These layers tend to impregnate the fluid only in an impregnation layer and do not fully distribute the liquid throughout the length, width and thickness of the member. These earlier attempts also did not always adequately prevent the lower density area from collapsing on its own, thus destroying the hollow space of the lower density area and resulting in low fluid acquisition rates and poor containment. Absorbent member acquisition regimes using these layers or zones are also limited by the limited abutting surface area between the high and low density areas. In this way, it may be advantageous to provide an absorbent member that fully distributes the liquid within itself, which maintains an open acquisition area for repeated attacks of the body exudate and which provides an increased area of abutting surface between the high and low regions. low density within the absorbent member.

BRIEF DESCRIPTION OF THE INVENTION The present invention is directed to improvements in absorbent cores of absorbent articles such as diapers, sanitary napkins and incontinence pads. In accordance with the present invention, an absorbent member is provided, for use in an absorbent core, which efficiently acquires and distributes body fluid throughout its entire structure and which maintains an open acquisition area for repeated fluid attacks. of the body. The absorbent member comprises an absorbent means that includes a low density fibrous medium and a plurality of absorbent strips having a greater density than the absorbent means, and which are distributed through the absorbent means. The absorbent strips can be randomly distributed or distributed in a pattern and can be composed of any paper, gauze or non-woven fabric, or of a paper laminate and superabsorbents. The strips preferably have a width of between about 0.3175 cm to about 1.90 cm, a length preferably between about 2.54 cm to about 6.35 cm and a thickness less than about 0.1905 cm.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a plan view of a preferred absorbent member of the present invention; Figure 2 is a schematic cross-sectional view, taken generally along line 2-2 of Figure 1; Figure 3 is a schematic cross-sectional view of a further embodiment of the absorbent member of the present invention; Figure 4 is a schematic cross-sectional view of a third embodiment of the absorbent member of the present invention; and Figure 5 is a perspective plan view, partially in cross section, of a disposable absorbent article using an embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION The present invention provides improvements for absorbent members for use in absorbent articles such as sanitary napkins, diapers and incontinence pads. These absorbent members are preferably able to either acquire the body fluid in an absorbent member or transmit (or impregnate) the rapidly acquired fluid through the absorbent member. The absorbent members of the present invention achieve these two functions, being composed of a plurality of absorbent strips of greater density, distributed throughout the length, width and thickness of a fibrous absorbent medium of lower density. The lower density fibrous medium of the present invention has a relatively open fibrous network having a large amount of hollow space. This open hollow space allows easy acquisition of the exudate from the body down towards the absorbent member or in the z direction. As used herein, the "z-direction" refers to the depth or thickness of the absorbent member, the "x-direction" refers to the length of the absorbent member and "y-direction" refers to the width of the absorbent member. . If the open hollow space is not maintained, the rate of body exudate acquisition is greatly reduced, which, as discussed below, can result in failure or spillage. The absorbent strips of the present invention have a higher density than the absorbent fibrous member. This difference in density creates a difference in capillary gradient and a gradient of capillary gradient between the absorbent strips and the fibrous medium. This force gradient tends to rapidly expel the fluid already acquired from the fibrous medium towards the absorbent strips, which then deposit or impregnate the fluid in the x-direction and towards the other portions of the absorbent member. As discussed in more detail below, this rapid transmission maintains the open hollow space or area of acquisition, removing the already acquired fl uids from the fibers of the absorbent fibrous medium before the fibers can be crushed on themselves by the weight of the fiber. acquired fluid. As discussed above, in order to have a capillary gradient necessary for the transmission of fluid between the fibrous medium and the absorbent strips, the absorbent strips must have a higher density and usually have a higher basis weight than the absorbent fibrous medium. The density of the absorbent strips can vary from about 0.05 g / cm3 to about 0.35 g / cm3, preferably from about 0.10 g / cm3 to about 0.25 g / cm3. The basis weight of the absorbent strips may vary from about 0.09675 grams per square centimeter to about 1.61 grams per square centimeter, and preferably from about 0.16125 grams per square centimeter to about 0.9675 grams per square centimeter. The density of the fibrous medium, which should be less than the absorbent strips, can vary from about 0.025 g / cm3 to about 0.25 g / cm3, or preferably from about 0.050 g / cm3 to 0.15 g / cm3. The basis weight of the fibrous medium is generally between about 0.3225 grams per square centimeter at about 1.61 grams per square centimeter.

The density of the absorbent member comprising the lower density fibrous medium and the higher density impregnation strips can vary from about 0.05 g / cm3 to about 0.25 g / cm3. When it is impractical to measure the density of the portion of the fibrous medium of the mixed absorbent member, it will be sufficient to measure the density of the absorbent member as a whole. If the density of the absorbent member is less than the density of the impregnation strips, the density of the fibrous medium must also be less than the density of the impregnation strips. The density of the absorbent member at any given site is determined by measuring the basis weight of the absorbent member at that site and dividing by the thickness of the absorbent member. For example, a given area or portion of the absorbent member can be cut and weighed to determine its basis weight and then divided by its thickness to determine the density of the absorbent member at that site. The density of the absorbent member at that site should be less than the density of any absorbent strip found in that portion of the absorbent member. The thickness of the absorbent strips, and the thickness of the absorbent member and the absorbent fibrous medium necessary to determine the densities, are determined using any conventional gauge with a confining pressure of 19.45 grams per 0.6084 square centimeters. An especially useful gauge is the "Linear Gauge Sensor" model No. 65503 made by ONO SOKKI of Japan, which has a circular base with a diameter of 2.54 cm. Since the absorbent strips are distributed through the directions x, y, z, within the absorbent fibrous medium, the absorbent member can efficiently distribute the fluid throughout its full depth, width and length. For maximum distribution of the fluid throughout the absorbent member, it is preferred that a portion of each absorbent strip touch at least a portion of another absorbent strip. This contact allows the transfer of fluid from one absorbent strip to another, which allows the fluid to be impregnated throughout the absorbent member. If there is no contact, the impregnation of the fluid would be greatly reduced, as the fibrous medium of lower density could not have the capillary force necessary to expel the fluid out of the absorbent strip and supply it to another absorbent strip or other portion of the absorbent member. This contact is very important for impregnation in the x direction, or length of the absorbent member ', since it is the furthest distance the fluid must travel. The ability to rapidly transmit fluid acquired from low density areas to areas of high density, partially depends on the surrounding surface area between these two different density areas. The present invention provides methods for increasing the abutting surface area between the low density and high density areas of the absorbent member. Although some contact or overlap is preferred between the absorbent strips for fluid transmission, it is preferred that this contact be maintained at a reasonable minimum. This contact or minimum overlap of the absorbent strip allows the maximum surface area of the absorbent strips to be exposed and is in contact with the fibrous absorbent medium, as most of the surface area of the absorbent strips is in contact with the medium fibrous instead of covering and being in contact with other absorbent strips. Due to the capillary gradient between the fibrous medium and the absorbent strips, this contact or maximum abutting surface area surface of the absorbent strip, provides a rapid transmission of the acquired fluid towards the absorbent strips from the fibrous medium surrounding the four absolute surfaces. and completely exposed (upper, lower and lateral) of the absorbent strips. In addition, this rapid transmission is improved when a plurality of absorbent strips are distributed through the fibrous medium. The fluid acquired in a given area of the fibrous medium could be drained by several, if not one, of these absorbent strips in that area. This rapid-transmission helps keep the acquisition area open and prevents the fibrous media (or capillary walls) from collapsing on its own due to the weight of fluid absorbed from the body. If the capillaries are crushed, the fluid, which could normally be conducted downward toward the absorbent member, would tend to remain at or near the upper surface of the absorbent member. If the absorbent member comprises the absorbent core of an absorbent article, as discussed below, this fluid on the surface can either rewet or fail to penetrate a top sheet of the absorbent article, thus producing an uncomfortable, wet surface of the absorbent article. In this way, the spill containment characteristics are improved by rapidly acquiring and distributing the liquid to and through the entire absorbent member. The low density fibrous medium of the present invention can be composed of a variety of fibrous materials including wood pulp, treated wood pulp, and synthetic fibers or mixtures thereof. These fibers can be short fibers having a length of between about 3,175 mm to about 762 mm. A portion of or all of the fibrous medium may be composed of treated or synthetic fibers. These fibers help maintain an open acquisition area and prevent capillary crushing, since they are rigid and elastic and resist crushing.

Said fibers include polyester, polypropylene, nylon or copolymers of the above. These fibers also include modified cellulose fibers, such as are described in the U.S.A. No. 5,183,707, issued February 2, 1993 to Herrón et al., And which is incorporated herein by reference. The lower density fibrous medium may also include superabsorbents to improve the total absorption capacity. The higher density absorbent strips of the present invention may be composed of almost any material, including non-woven fabrics, gauze or paper, which may also have moisture and dry resistance resins and a basis weight of about 0.0645 grams. per square centimeter at about 1.93 grams per square centimeter, preferably between about 0.1935 grams per square centimeter to about 0.645 grams per square centimeter. These absorbent strips may also contain added value particles for absorbency and other purposes. These materials include fibrous or granular superabsorbents (sometimes referred to as hydrogel-forming polymers, odor control materials or desiccants.) To trap these value-added materials, the absorbent strips may optionally have a laminar construction, eg, the absorbent strip is preferably it can be a gauze sheet composed of an upper gauze layer, a lower gauze layer, and added value particles disposed between the two layers of gauze, and an adhesive that connects the two gauze layers together and keeps the superabsorbent between the layers of gauze. gauze layers The gauze layer sheet can be an air laid or wet laid structure composed of natural fibers, modified wood fibers, synthetic fibers, or any combination of these materials.Synthetic fibers can be polypropylene , polyethylene, rayon or nylon can also be single-component or two-component fibers mponents, which can be stable to temperature or can be thermally bonded. 37 pounds per 3000 square feet of air-laid gauze, manufactured by Ft, have been found very useful. Ho ard, or 27 pounds per 3000 square feet of wet-laid gauze manufactured by Procter & Gamble Co., (and sold in a two-fold product such as paper towels • Bounty.) The adhesive of the sheet may be composed of a latex-type adhesive sensitive to pressure, or sensitive without pressure, or any other type of adhesive known in the art If desired, the adhesive may also contain elastomeric elements A type 2158 adhesive manufactured by Findley Adhesives, Inc. of Wauwatosa, Wisconsin, has been found very useful.

The superabsorbent materials trapped in the sheet are constituted of inorganic or organic compounds substantially insoluble in water, capable of absorbing ten times or more of their own weight in fl uids and retaining these fluids under pressure. The superabsorbents may be in the form of fibers, spheres, particles, film fragments or bands. The superabsorbents, or hydrogel-forming polymers, such as those described in the U.S.A. No. 32,649 of Brandt et al., And incorporated herein by reference, are useful superabsorbents. It has also been found that Nalco 1180 is a suitable superabsorbent. The added value particles may comprise up to about 99% by weight of the absorbent strips, preferably less than 67% by weight, and most preferably 33-50% by weight. The absorbent strips useful in the practice of the invention have a variety of dimensions. The strips may have a length to width ratio of at least about 4: 1 and preferably at least about 10: 1. The absorbent strips may have a length of between about 1.27 cm to about the length of the absorbent member. Preferably, the length varies from about 2.53 cm to a length less than the width of the absorbent member, usually less than- about 6.35 cm in the case of sanitary napkins. The width of the strips can be from about 0.254 cm to about 3.81-cm, preferably from about 0.3175 cm to about 1.905 cm and most preferably around 0.635 cm. The thickness of the strips can be between about 0.00254 to about 0.3175 cm. The individual absorbent strips may have the same dimensions or their dimensions may vary through the absorbent member. The absorbent strips may comprise from about 5 to about 75% by weight, preferably less than 50% by weight of the absorbent member, and may be distributed in a variety of ways within the absorbent member. For optimum fluid distribution, it is preferred that the absorbent strips be distributed to cover most of the length (x direction) and width (y direction) of the absorbent member. In order to fully distribute the fluid acquired through the absorbent member, it is preferred that at least 50% of the area of the projected plane x / y be covered by the absorbent strips. The "projected plane x / y" includes all planes x / y through the depth of the absorbent member. A point on the area of the projected plane x / y is considered covered if some point, along the normal line to the upper surface of x / y of the absorbent member, comes into contact with an absorbent strip. In addition to having the x / y direction of the absorbent strip covered, it is preferred that a greater part of the strips -. absorbers are each within an absorbent strip distance ("") of another absorbent strip in the area of the projected plane x / y. If the width of two absorbent strips differs, w equals the width of the narrowest strip. A first absorbent strip is within an absorbent strip width of another absorbent strip in the area of the projected plane x / y, if any perpendicular line of the x / y plane extends in the z-direction which is not greater than a distance of away from any edge of the first absorbent strip and is brought into contact with another absorbent strip. This placement of the absorbent strips allows the fluid to be rapidly acquired and dispersed throughout the absorbent member. The absorbent strips are not only distributed across the width and length of the absorbent member, but are also distributed throughout the thickness of the absorbent member. However, it is preferred that a layer in the z direction, closest to the surface facing the body (ie, the surface that will first find the body fluid) of the absorbent member, does not contain any absorbent strip, but only the fibrous absorbent medium of lower density. This layer is sometimes referred to as a powder coat. By having no absorbent strip on the body surface of the absorbent member, body fluid can be easily acquired towards the depth of the absorbent member before it comes into contact with any of the higher density absorbent strips. This avoids the possibility of body fluid remaining on or near the surface of the absorbent article, while waiting for it to be acquired by the absorbent member. For example, if the body fluid was deposited directly on a higher density absorbent strip with little hollow space, the fluid could take more time to be acquired, than if it were deposited on the lower density fibrous medium, which has a higher density. amount of hollow space. If the absorbent member makes the absorbent core of an absorbent article, this minor acquisition may cause the deposited body fluid to remain on the topsheet of an absorbent article or may cause the topsheet to be rewetted by the liquid on the body surface of the absorbing member.

Any of the situations causes discomfort to the user.

As discussed in more detail below and as seen in the figures, the absorbent strips can be randomly distributed, homogeneously distributed or distributed in predetermined patterns through the directions x, y, z. Figures 1-5 show various embodiments of the present invention. As seen in Figures 1 and 2, there is provided an absorbent member 10, of the present invention, comprising a plurality of absorbent strips 12 randomly distributed through an absorbent fibrous medium 14. The absorbent strips 12 are distributed through the absorbent strips 12. all directions x, y, z of the absorbent member 10. In addition to the random, homogeneous placement of the absorbent strips 12 in the absorbent member 10, as shown in Figures 1-2, the absorbent strips can also be arranged in a predetermined pattern within the absorbent member. As seen in Figure 3, an alternative absorbent member 310 of the present invention is provided, which includes absorbent strips 312 distributed in a fibrous medium 314 in a predetermined pattern "V". As seen in Figure 3, the absorbent strips 312A and 312B, closest to the upper part or surface 340 facing the body of the absorbent member 310, are closer to the longitudinal edges 342 and 344 of the absorbent member 310. Progressing towards below, from the upper surface 340 to the lower surface 346, the absorbent strips 312 are located closer to the center of the width of the absorbent member 310, and farther from the longitudinal edges 342 and 344 of the absorbent member 310. This pattern provides a Large acquisition zone for users' heavy fluid flow attacks. The fluid readily enters the low density fibrous medium 314, above the higher density absorbent strips 312 and quickly flows to the bottom of the absorbent member 310 under capillary control by contacting some of the absorbent strips 312 on the downward path through the pad. At this point, it is brought into contact with other absorbent strips 312C and 312D near the center of the bottom surface of the absorbent member 310, which continues to drain the low density fibrous medium 314 by making a quarter for the next fluid attack. This pattern also provides impregnation and storage along the sides of the absorbent member to prevent lateral spillage by the fluid flowing on the sides. As seen in Figure 4, another alternative embodiment of the present invention is provided. An absorbent member 410 is provided wherein the absorbent strips 412 are distributed in an absorbent fibrous medium 414 in an inverted V pattern. As seen in Figure 4, the absorbent strips 412A and 412B closest to the upper surface 440 of the absorbent member 410, are closer to the center of the width of the absorbent member 410 and farther from the longitudinal sides 442 and 444 of the absorbent member 410. As a moving from the upper part or from the surface 440 facing the body towards the lower surface 446 of the absorbent member 410, the absorbent strips are placed closer to the longitudinal edges 442 and 444 of the absorbent member 410. The absorbent strips 412C and 412D closer to the lower surface 446, they are also closer to the longitudinal edges 442 and 444. This pattern is designed to provide a continuous impregnation of the medium to light fluid attacks and a heavy, occasional attack of fluid. The medium to the light fluid attack enters the core through the low density fibrous medium, closer to the absorbent strips 412A and 412B, which rapidly drain the fibrous medium to keep the absorbent member ready for the next attack. If a heavy fluid attack occurs, the fluid that does not have time to be drained by the strips 412A and 412B will fall cascading through another portion of the low density fibrous medium 414 and onto another or several absorbent strips, the which will drain the fibrous medium 414. Also, as seen in Figures 2-4, the upper surfaces 26, 326, 426, lower surfaces 28, 328, 428 and lateral surfaces 30, 32, 330, 332, 430, 432, of the absorbent strips 12, 312, 412 are all exposed to the low density fibrous medium 14, 314, 414. As discussed above, this maximum surface area exposure allows for the rapid transmission of fluid acquired from the fibrous medium 14, 314, 414 over the four sides of the absorbent strips 12, 312, 412, which keep the acquisition area open. As discussed above, the absorbent strips may contain superabsorbents. Both the amount and the type of the absorbent can vary between the strips. It is preferred that the individual strips contain only one type of absorbent. If different types of absorbers are used between the strips, it is preferred that this change varies between the strips in the z-direction. It is preferred that the strips closest to the body-facing surface contain superabsorbents that absorb and swell slowly and that the strips furthest away from the body-facing surface have faster absorbency rates. It is believed that this type of z-gradient superabsorbent variation will allow a fluid to be rapidly acquired towards the thickness of the absorbent members and prevent the area, which is close to the body-facing surface, from remaining wet. For example, it is preferred that the absorbent strips, located in the upper half of the thickness of the z-direction, contain superabsorbents that are capable of absorbing exudates at such a rate that they reach at least about 80% of their capacity no faster than in 120 seconds, such as the superabsorbent sold under the tradename Nalco 1180. It is also preferred that the absorbent strips in the lower half of the z-direction thickness contain superabsorbents that absorb exudates at such a rate that they reach at least 80% of its capacity in less than 60 seconds, preferably in less than 45 seconds, such as superabsorbents sold under the tradename Fibersorb SA7200 (initially manufactured by Arco Chemical Co. of Newton Square, Penn.). A suitable method for the percentage of capacity velocity is described in the patent application of E.U.A. Series No. 07 / 637,090, filed by Noel et al., On January 3, 1991 (PCT International Publication No. WO 92/11830), published July 23, 1992, which is incorporated herein by reference. For the same reasons, if the amount of superabsorbent varies between the strips, this should vary in the z-direction with strips containing the lowest load of superabsorbents near the body-facing surface, and strips containing the highest load of superabsorbency more away from the surface that looks at the body. If the amount of superabsorbent varies between the strips, it is preferred that the strips, in the upper half of the thickness of the z-direction between the body-facing surface and one-half the thickness of the absorbent member, contain between about 0-50% by weight. The weight of the total superabsorbent contained in all the absorbent strips of the absorbent member, and the strips in the lower half of the thickness of the z-direction, contain between about 50-100% by weight of the total superabsorbent contained in all the strips. As shown in Figures 2-4, and discussed above, the absorbent fibrous medium 214, 314 and 414 may not contain superabsorbents or may contain superabsorbents in various distributions. As seen in Figure 2, the absorbent fibrous medium 214 does not contain superabsorbent particles. As seen in Figure 4, the superabsorbent particles 422 are distributed in an almost uniform distribution through the thickness of the absorbent member 410. While, as seen in Figure 3, an upper layer 350 of the absorbent member 310 has a load low of superabsorbent particles 322 in the fibrous medium 314, and a lower layer 352 has a heavier or denser load of superabsorbent particles 322. The basis weight of the superabsorbents in the top layer 350 may vary from about 0.0645 grams per square centimeter at approximately 0.22575 grams per square centimeter. The basis weight of the superabsorbents in the lower layer 352 can vary from about 0.129 grams per square centimeter to about 0.4515 grams per square centimeter. As seen in Figure 5, an absorbent article 500, a sanitary napkin, is provided, which utilizes the absorbent members of the present invention. The absorbent article 500 contains a liquid-permeable topsheet 502 attached to a backing sheet 504 impermeable to liquid. Arranged between the topsheet 502 and the backsheet 504 is an absorbent member 510 of the present invention. As seen in Figure 5, the absorbent member 510 has absorbent strips 512 randomly distributed in an absorbent fibrous medium 514 similar to the distribution shown in Figures 1-2.

As seen in Figure 5, and also in Figures 2-4, the layers of the upper or body surfaces 540, 440, 340, 40 of the absorbent members 510, 410, 310, 10 do not contain absorbent strips, but that only the lower density fibrous absorbent medium 514, 414, 314, 14. As discussed above, these preferred powder layers avoid the problems of slow fluid acquisition and rewetting. The absorbent members of the present invention can also be disposed between the fluid-permeable top sheets and the fluid-impermeable backsheets of absorbent articles, such as adult incontinence pads and pads. In addition to providing efficient fluid distribution through the absorbent member, the absorbent strips provide the absorbent member with better core integrity than an absorbent member consisting only of wood pulp fluff without absorbent strips. For example, an absorbent member consisting of a fibrous medium of wood pulp fluff with absorbent strips composed of laminates having an upper and lower layer of gauze with superabsorbent therebetween randomly distributed in the wood pulp, would have tensile strength. higher than an absorbent member with only lint.

Since particular embodiments of the present invention have been illustrated and described, it will be obvious to those skilled in the art that other changes and modifications may be made without departing from the spirit and scope of the invention. Therefore, it is intended to cover, in the appended claims, such changes and modifications as are within the scope of this invention.

Claims (3)

1. - An absorbent member for use in an absorbent core, said absorbent member comprising a low density absorbent means comprising a fibrous material, said fibrous material preferably being selected from the group consisting of wood pulp fiber, synthetic fibers, fiber pulp modified wood and mixtures thereof, said absorbent means preferably further comprising superabsorbents, said absorbent member characterized in that it comprises: a plurality of absorbent strips, preferably comprising up to 50% by weight of the absorbent member, said absorbent strips having a density greater than absorbent member, preferably a density of 0.10 g / cm3 to 0.25 g / cm3, said absorbent strips preferably having a length of 25.4 mm to 63.5 mm, a width of 3.175 mm to 19.05 mm, and a thickness of 0.0254 mm to 3.175 mm, said absorbent strips preferably having a basis weight of 15.5 g / cm2 to 465 g / cm2 , said absorbent strips being distributed through the absorbent means, preferably wherein most of the absorbent strips are in physical contact with at least one of said absorbent strips, at least 50%, of the area of the projected plane of x. and is covered by said absorbent irides, and most of the absorbent strips are within the width of an absorbent strip of another absorbent strip in said projected plane of x / y, said absorbent strips comprising a material selected from the group that it consists of paper, gauze and non-woven materials, said absorbent strips preferably comprising paper and superabsorbents, wherein said superabsorbents comprise up to 50% by weight of the absorbent strips, and said absorbent strips comprise a laminate of paper and superabsorbents.

2. An absorbent strip for use in an absorbent member, characterized in that said strip comprises: a densified absorbent strip having a length of 25.4 mm to 63.5 mm, a width of 3.175 mm to 19.05 mm, a thickness of 0.0254 mm to 3.175 mm, and a density of 0.10 g / cm3 to 0.25 g / cm3, said absorbent strip preferably 'comprising a material selected from the group consisting of paper, gauze or a non-woven material having a basis weight of 15.5 g / cm2 to 465 g / cm2, said absorbent strip most preferably comprising paper and superabsorbents, wherein said superabsorbents comprise up to 50% by weight of the absorbent strips, and said absorbent strips comprise a laminate of paper and superabsorbents.

3. - An absorbent article comprising a fluid-permeable top sheet, a backing sheet, impervious to fluid, and an absorbent core disposed between said top sheet and said backsheet, the absorbent core comprising a low density absorbent means that comprises a fibrous material, said absorbent article characterized in that the absorbent core comprises: absorbent strips, preferably comprising up to 50% by weight of the absorbent member, said absorbent strips having a greater density than the absorbent member, preferably a density of 0.10 g / cm3 a 0.25 g / cm3, said absorbent strips preferably having a length of 25.4 mm to 63.5 mm, a width of 3.175 mm to 19.05 mm, and a thickness of 0.0254 mm to 3.175 mm, said absorbent strips preferably having a basis weight of 15.5 g / cm2 to 465 g / cm2, said absorbent strips being distributed through the absorbent medium, preferably where most of the absorbent strips are in physical contact with at least one other such absorbent strips, at least 50% of the area of the projected plane of x / y is covered by said absorbent strips, and most of the strips absorbers are within the width of an absorbent strip of another absorbent strip in said projected plane of x / y, said absorbent strips comprising a material selected from the group consisting of paper, gauze and non-woven materials, said absorbent strips preferably comprising paper and superabsorbents, wherein said superabsorbents comprise up to 50% by weight of the absorbent strips, and said absorbent strips comprise a laminate of paper and superabsorbents.