MXPA99008313A - Improved disposable absorbent article - Google Patents

Abstract

Se describe un artículo desechable, tal como un pañal desechable, provisto con una estructura novedosa, que le da la apariencia de un pañal de tela, ya que no existe material plástico alguno a la vista del consumidor. El pañal comprende hojas superior y posterior o de respaldo ambas formadas de una tela no tejida o algún material similar, no plástico, un núcleo absorbente envuelto parcialmente en un material plástico de manera que el material plástico contenga toda la humedad dentro del pañal y permita el uso de una cantidad reducida de material absorbente. En una forma de realización preferida, el núcleo absorbente es de forma rectangular a base de celulosa laminada, con polímeros superabsorbentes dispuestos en su porción central en el patrón deseado. Además, se disponen barreras laterales impermeables, ancladas, selladas o unidas permanentemente al envolvente parcial del núcleo absorbente, actuando ambos elementos conjuntamente para evitar cualquier posibilidad de filtraciones o fugas. La invención permite además incorporar en el pañal un mejorado sistema de barreras laterales en el cual se dispone material impermeable dentro de las barreras que se une funcionalmente al envolvente parcial impermeable del núcleo absorbente, asísellando el pañal y evitando todo tipo de fugas laterales. La invención también es aplicable a otros artículos absorbentes desechables, tales como toallas sanitarias, protectores para pantaleta, pañales para adultos incontinentes, etc.

Description

Summary.

A disposable article is described, such as a disposable diaper, provided with a novel structure, which gives it the appearance of a cloth diaper, since there is no plastic material in view of the consumer. The diaper comprises top and back or back sheets both formed of a non-woven fabric or some similar material, not plastic, an absorbent core partially wrapped in a plastic material so that the plastic material contains all the moisture within the diaper and allows the use of a reduced amount of absorbent material.

In a preferred embodiment, the absorbent core is rectangular in shape based on laminated cellulose, with superabsorbent polymers arranged in its central portion in the desired pattern. / In addition, impermeable lateral barriers are provided, anchored, sealed or permanently joined to the partial enclosure of the absorbent core, both elements acting together to avoid any possibility of leaks or leaks.

The invention also allows incorporating into the diaper an improved system of lateral barriers in which impermeable material is disposed within the barriers that functionally joins the impervious partial shell of the absorbent core, thus sealing the diaper and avoiding all types of lateral leaks.

The invention is also applicable to other disposable absorbent articles, such as sanitary napkins, panty liners, incontinent adult diapers, etc.

BACKGROUND OF THE INVENTION Disposable absorbent articles, such as disposable diapers manufactured and marketed today have not changed much in the last ten years, at least. By way of example, disposable diapers are still manufactured from a liquid-permeable top sheet, generally from a non-woven fabric; a back or waterproof backing sheet, usually made of low-caliber polyethylene; an absorbent core, generally of an absorbent material such as cellulose pulp combined with superabsorbent hydrogel-forming polymers. This traditional structure has been improved based on innovations such as an elastic waist; an internal or external frontal tape system, to hold and release the diaper in order to inspect the user; lateral anti-drip barriers in the interior of the diaper, adapted to the upper sheet, elastic members in the crotch portion; absorption gradients; absorbent cores with fluid admission and direction structures; development of polymer forming superabsorbent hydrogels; improved cellulose pulps, etc.

This traditional structure, while it has found considerable acceptance in the market, lacks several disadvantages. For example, in recent years the development of a greater ecological awareness has censored the use of a back sheet or backing based on plastic material, for example, low-caliber polyethylene, since each user of disposable diapers uses a good number of diapers every day, which are discarded in a discriminated manner.

The use of polyethylene or similar plastic materials as backsheet or backing has, in addition, the drawback of preventing the skin of the diaper wearer from "breathing".

This ecological rejection to the use of polyethylene, even in the case of low caliber polyethylene, as well as the rejection by the contact of the polyethylene with the skin (although this is usually accidental, since the upper sheet that is the one that makes contact with the The user's skin is usually made of a non-woven fabric) has led a good number of consumers to look again for cloth diapers, which dominated the market until before the basic development of disposable diapers known today, although the Use of these has several drawbacks, such as lack of hygiene in the user if it is neglected, as well as the need to be constantly washing the diapers so that they can be reused.

The widespread rejection of polyethylene due to ecological considerations has led to the search for biodegradable back sheets, but to date no biodegradable materials have been developed that can serve as subsequent sheets impermeable to liquids.

Another problem with traditional diapers is that the superabsorbent polymers are "ball" inside the absorbent core, since it has not been possible to uniformly mix the superabsorbent polymers with the cellulose to date.

In the case of sanitary napkins, the evolution of this type of products has not been able to avoid the use of a back sheet or backing based on a plastic material.

Another disadvantage of conventional disposable diapers is an excessive use of absorbent material, particularly cellulose fibers, as this is distributed over virtually the entire interior of the disposable diaper, to absorb liquids that may diffuse through the entire interior of the diaper. . The increasing use of superabsorbent hydrogel-forming polymers, which greatly improve the efficiency of cellulose fibers, to improve the performance of cellulose pulp has not been able to prevent the excessive use of absorbent material, particularly cellulose fibers, given the structure conventional disposable diapers.

In recent years a great development has been achieved in the field of non-woven fabrics, which are used in disposable diapers as an upper sheet, permeable to liquids. These non-woven fabrics, besides being able to be treated to facilitate the admission of fluids into the diaper and prevent their return to the outside, by means of treatments of hydrophilic and hydrophobic type, as the case may be, have been recognized by consumers as adequate for contact with the skin of users, which in the case of disposable diapers are babies. Therefore, consumers would positively see that a greater amount of non-woven cutting is used in a disposable absorbent article, such as a disposable diaper or sanitary napkin, since it would have a feeling of greater softness and comfort besides avoiding the use of polyethylene.

In fact, the manufacturers of disposable absorbent articles, recognizing the appearance of desirable fabric in their products, generally provide the polyethylene back or back sheet with a highlight or matte finish, to minimize the plastic appearance of said sheet.

In the above context, it has been found that conventional disposable absorbent articles can be considerably improved by using a non-woven fabric instead of the backsheet or liquid impervious backing; This non-woven fabric can be laminated to the top sheet to provide the disposable absorbent article with a highly improved appearance, similar to that of a conventional fabric. In order to use non-woven fabrics on both sheets of a disposable absorbent article, it has been devised to partially enclose the absorbent material in a plastic material, which would have as a paper that of the liquid impervious sheet, and to link this wrapper of the absorbent core with a system of more efficient side barriers, as an additional advantage, in this way the amount of absorbent material used in the disposable absorbent article can be reduced, while offering the consumer a product with a better appearance, more comfortable and with equal performance or higher than that of conventional disposable absorbent articles, at a generally lower cost.

Summary of the invention The present invention achieves to improve conventional disposable absorbent articles, of the prior art, by providing an improved structure for them, in which the back or back sheet, which in the prior art was always impermeable to liquids and generally of a Plastic material such as polyethylene, is now formed of a non-woven fabric or a similar material with a fabric appearance and greater softness and comfort; the function of liquid impermeability performed in the disposable absorbent articles of the prior art is now carried out by wrapping the absorbent material partially in a sheet of plastic material, generally of smaller caliber than that used in the prior art as a backsheet, in the inside of the diaper, with the additional advantage that this absorbent core partially wrapped in plastic material allows a considerable saving in the amount of waterproof material used, since it avoids disposing absorbent material in those areas of the diaper where only liquids arrive by diffusion in the inside of the diaper. If desired, a hydrophobic treatment can be given to the non-woven fabric that forms the backing sheet, to improve its performance, repelling any liquid that could be filtered.

The absorbent material can also be arranged partially wrapped in low-caliber polyethylene, in a rectangular arrangement, thus saving cellulose compared to conventional diapers.

This rectangular arrangement can use laminated cellulose, folded, for example, into three parts, with the central portion having superabsorbent polymers or hydrogel-forming polymers in a desired pattern. For example, the pattern of superabsorbent material disposed in the central portion of cellulose may have a higher concentration in selected areas, depending on the end user of the diaper, ie boy or girl. Instead of mixing the superabsorbent polymers with the cellulose by being arranged in the central portion in the desired pattern, they are prevented from "beating" and at the same time the absorption is improved; in a preferred embodiment, said superabsorbent polymers are arranged in the central portion of the absorbent core with the aid of an adhesive (which does not interfere with their performance).

In the most preferred embodiment of the invention, impermeable side barriers are provided including two layers inside which an impermeable material, such as the impervious material of the partial wrapper of the absorbent core, is arranged and which is anchored precisely in the partial envelope of the absorbent core, thus sealing the diaper perfectly when making this anchor with the partial wrapping material of the absorbent core, in the part where the material turns towards the upper surface of the absorbent material, and that act together to avoid any type of leakage or filtration. Advantageously, the impermeable side barriers are made of non-woven material, inside which is disposed polyethylene of the same caliber as the wrapping of the absorbent core.

Brief description of the drawings.

The invention will be better understood from a reading of the description given below, in conjunction with the accompanying drawings, in which a presently preferred embodiment of a disposable absorbent article according to the invention is illustrated. However, it should be remembered that the embodiment illustrated in the accompanying drawings is given by way of example, and that the scope of the invention is limited only by the wording of the appended claims. Figure 1 is an exploded view, in perspective, of a disposable diaper in accordance with the present invention, illustrating the back or back sheet, the absorbent core and the top sheet. Figure 2 is a top plan view of the top sheet of a disposable diaper in accordance with the present invention. Figure 3 is a schematic view of an absorbent core for use in the present invention. Figure 4 is a schematic view of the absorbent core of Figure 3, in an open configuration.

Figure 5 is a section of the diaper showing the union of the impermeable material of the side barriers with the partial envelope of the absorbent core. Figure 6 is a partial sectional view of a disposable absorbent article according to the present invention. Figure 7 is a section of the diaper showing an alternate embodiment of the anchoring of the impermeable material of the side barriers with the wrap of the absorbent core.

Detailed description of the invention The present invention will now be described with reference to the accompanying drawings and to a currently preferred embodiment thereof. By way of example, the invention will be described based on a disposable diaper, but it should be noted that the invention is equally applicable to other disposable absorbent articles, such as sanitary napkins, panty liners, etc.

As used herein, the term "absorbent article" refers to devices that absorb and contain body discharges or exudates and, more specifically, refers to devices that are placed against or in proximity to the user's body to absorb and contain the various exudates discharged from the body.

The term "disposable" is used herein to describe absorbent articles that are not intended to be washed or otherwise restored or reused as an absorbent article, (i.e., are intended to be discarded after being used only once. ).

As used herein, the term "diaper" refers to an absorbent article generally worn by infants and incontinents that is worn around the lower part of the wearer's torso. However, it should be understood that the present invention is also applicable to other absorbent articles such as incontinent briefs, intimate incontinence garments, sanitary napkins, panty liners and the like.

With reference to Figure 1, there is shown, in "exploded" form, a disposable absorbent article structure according to the invention, particularly a disposable diaper. The back or back sheet - which in the prior art was generally made of low caliber polyethylene or a similar plastic film - is shown with the number 11 as is conventional, the back sheet 11 may have adhesive tapes 11 in the corners, at one end, to hold the diaper around the wearer's torso. The back or back sheet may also include an elastic or elasticized tape 13 at the other end, as well as a front band 14 or other device for holding the adhesive tapes 12 so that the diaper can be fastened and can also be opened easily for inspection to the user, as is well known in the art. The back or back sheet 11 may also be provided with elastic elements 15 in the crotch portion, although it is generally preferred that these elastic elements, as is styled in the art, be disposed in the top sheet, as will be described below.

One of the essential characteristics of the present invention, which differentiates it radically from the disposable absorbent articles of the prior art, lies particularly in the fact that the back or back sheet 11 is not made of a plastic film, but of a non-woven fabric. woven or other similar material, which may even be permeable to liquids.

The back or back sheet 11 can be manufactured from a wide range of materials, such as non-woven fabrics; porous foams; cross-linked foams; or woven or nonwoven webs of natural fibers (e.g., wood or cotton fibers), synthetic fibers (e.g., polyester or polypropylene fibers), or a combination of natural and synthetic fibers. Preferably, the backsheet 11 is made of a material that has the appearance of a cloth or the like, and is soft and comfortable to the touch. In a preferred embodiment of the present invention, the back or back sheet 11 is made of a non-woven fabric similar to that used for the top sheet (as will be described later).

As discussed, generally the back or back sheet of a disposable absorbent article is impervious to liquids; however, in the present invention, the back or back sheet 11 does not need to be so, since the function of providing liquid impermeability has been taken by the absorbent core itself, and particularly by the liquid impervious wrapping that surrounds, which works for that purpose along with the lateral barriers that will be described later. Therefore, the back or back sheet 11 can be a non-woven fabric, permeable to liquids. However, in a preferred embodiment, the back or back sheet 11 is made of a non-woven fabric that has been treated with a hydrophobic agent on its inner surface (i.e., the surface facing the inside of the diaper). ) in order to repel any moisture that may have leaked. This treatment with a hydrophobic agent, if desired, can also be imparted to the outer surface of the back or back sheet 11, although this is not essential.

When a non-woven fabric is used, the front belt 14 can be a polyester or polypropylene film, for example, as is known in the art, smooth or highlighted; a multi-layered fastening system for controlling the adhesion adequately so that the adhesive of the adhesive tape 12 does not adhere too firmly to the polyester or polypropylene film for example a system having a plastic film backing coated with a non-plastic fastening control material, for example of carbamate or silicone, or it can be a well-formed tape of a latex plasticizer or the like, or even a structure formed by melting the non-woven fabric in that portion of the diaper; form a reception area for adhesive appointments. A back or back sheet 11 of nonwoven fabric or similar materials allows to use more varied fastening systems than in the case of a conventional back or back sheet, made of polyethylene.

One of the advantages of using a non-woven fabric for the back or back sheet 11 is the possibility of laminating the back sheet with the top sheet 18 (also illustrated in figure 1) which is also made of a non-woven fabric . This structure laminated to those portions of the disposable diaper where there is no absorbent material (for example, the portions identified as 5 of Figure 2) will thus have an even better appearance very similar to that of a cloth diaper, with the advantages of a highly efficient disposable diaper.

This laminated structure can also include a cushioned, bulky appearance or the desired appearance, which can be controlled in the lamination process, as is known in the art, and will in fact provide the disposable diaper with an appearance very different from that which it contains. conventional disposable diapers fitted with a back sheet or polyethylene backing.

In the same figure 1 the absorbent core 16 is seen to be placed between the backsheet 11 and the upper sheet 18. The absorbent core 16 is generally a combination of cellulose pulp and superabsorbent polymers, hydrogel formers if it is desired to make thinner the absorbent article, the proportion of superabsorbent polymer, hydrogel formers is increased and the content of cellulose fibers is decreased.

The absorbent core 16 may be any absorbent means that is capable of absorbing or retaining liquids such as body fluids, whether exudates such as urine and even feces, or vaginal fluids. The absorbent core 16 has a body-facing surface (i.e. towards the topsheet 18), and a surface facing the user's garment (i.e., toward the backsheet 11).

The absorbent core 16 can be manufactured in a wide variety of sizes and shapes (eg, rectangular, oval, or in the form of an hourglass, in the form of dog bone, asymmetric, etc.) and a wide variety of materials liquid absorbers commonly used in disposable diapers and sanitary napkins and other absorbent articles such as shredded wood pulp which is generally referred to as air felt.

Examples of other suitable absorbent materials include cellulose wadding; polymers insufflated in the molten state, including coform; chemically stiffened, modified or crosslinked cellulosic fibers; capillary channel fibers, synthetic fibers such as engargoladas polyester fibers, artificial moss; toilet paper including wraps and laminates of toilet paper; absorbent foams; absorbent sponges, superabsorbent polymers; absorbent gelation materials; or any equivalent material or combinations of materials or mixtures thereof.

The configuration and construction of the absorbent core 16 can also be varied. { for example, the absorbent core may have zones of variable gauge (eg, profiled, so as to be thicker in the center), hydrophilic gradients, superabsorbent gradients, or acquisition zones of lower density and lower average basis weight; or may comprise one or more layers or structures} . The total absorbent capacity of the absorbent core 16, however, must be compatible with the design load and intended use of the disposable absorbent article in question. In addition, the size and absorbent capacity of the absorbent core 16 can be varied to accommodate different uses such as incontinence briefs, panty liners, disposable diapers, regular sanitary napkins, or nighttime sanitary napkins.

One of the essential features of the present invention consists in the fact that the absorbent core 16 is partially wrapped in a liquid impervious material. In a preferred embodiment, the sheath 17 of the absorbent core 16 is made of polyethylene, with the advantage that a much thinner gauge than that generally used for the backsheet or backing can be used in the disposable absorbent articles of the prior art. .

The partial wrap 17 has various advantages. One of them is that it allows the use of a backsheet or backing of non-woven fabric, or similar material, instead of polyethylene, since the casing 17 performs the function of liquid impermeability that in the disposable absorbent articles of the Prior art made the polyethylene backsheet, in addition to this way a superior, highly improved appearance is obtained by the use of the non-woven fabric or similar material as a backsheet or backing sheet. The nonwoven fabric material of the back or back sheet further has the advantage of allowing the diaper to breathe from its interior, thereby facilitating the evacuation of moisture from the interior of the diaper. In the past the use of a backsheet or polyethylene backing had the disadvantage of not allowing the skin of the diaper user to breathe. Another advantage of the absorbent core according to the present invention is that it allows to reduce the amount of absorbent material, since it is sufficient to wrap it partially in a rectangular area of the diaper, as seen in the figures, instead of disposing the diaper in virtually the entire interior of the disposable diaper, as is traditionally the case. This can be seen more clearly in figure 2, in which the absorbent material will be in the space delimited by the lines 28, which correspond to the limits of the partial envelope 17. Towards the sides, the limit of the absorbent material coincides with the lines 27. In fact, these lines 27 may coincide with the anti-compression side barriers, described below and not shown in this figure for clarity. Therefore, the absorbent material in the zone identified as 25 is saved, which translates into considerable savings.

A presently preferred embodiment of the invention is illustrated in Figures 3 and 4.

Referring first to Figure 3, there is seen an absorbent core assembly 50, which is rectangular in shape, and is formed of cellulose 52 or other similar absorbent material, such as those already mentioned. This absorbent core assembly 50 is partially wrapped with a liquid impervious material, which is preferably low caliber polyethylene. In the low caliber it means approximately 16 g m2, in contrast to the values of the order of 26 g m2 used for the back sheets or backing of conventional diapers, which proves the significant cost savings and the lower use of a plastic material, which has traditionally been considered as the most "offensive" component of disposable diapers from the ecological point of view.

It should be noted that the absorbent core 50 of Figures 3 and 4 is equal to the absorbent core 16 of Figure 1; likewise, the enclosure 51 of figures 3 and 4 is equal to the enclosure 17 of figure 1, and so on. Different reference numbers have been used only for purposes of distinguishing between the figures although the various elements illustrated therein can be and are in fact equivalent.

The partial wrap 51 preferably covers the entire lower surface (not shown) of the absorbent core assembly 50 and projects to the sides, reaching to the ends of the upper surface of the absorbent core assembly 50. This rectangular arrangement utilizes cellulose in the form of laminated, that bends in itself; this arrangement works as a gradient for the absorption of body exudates and also avoids having to mix the superabsorbent polymers with cellulose 52 or other similar material.

As can be seen more clearly in Figure 4, the mentioned arrangement also has the advantage that superabsorbent polymers 60 can be easily disposed on the central portion of absorbent core assembly 50 in the desired pattern, without mixing with cellulose 52. If By mixing such polymers with cellulose 52 or similar material, it would be more difficult to control the concentrations of superabsorbent polymer in the various areas of the absorbent core assembly.

As discussed, the superabsorbent polymers 60 can be disposed in the central portion of the absorbent core assembly 50 in the desired pattern; for example, it is possible to have a higher concentration of superabsorbent polymers in the areas near the discharge points of body exudates, both in the case of male and female users it has been found that superabsorbent polymers 60, instead of being mixed with the cellulose they can simply be arranged on the surface of the central portion of the absorbent core assembly 50 with the aid of an adhesive. Obviously, any adhesive that does not interfere with the performance of the said superabsorbent polymers can be used.

Turning now to Figure 5, they illustrate the innovative system of lateral barriers or anti-drip barriers of the present invention the absorbent core 50, as already discussed above, is partially wrapped with the wrapping material 51, generally polyethylene of low caliber In the part of the wrapping material 51 that turns around towards the upper sheet of the diaper, a sheet of impermeable material 62 arranged inside the side barriers or anti-runoff barriers formed by two sheets 60, 61 of material can be anchored. soft, such as a non-woven fabric. This anchoring of the side barriers in the partial wrapping material of the absorbent core results in an effective, integral seal that effectively prevents any type of leakage or leakage to the outside of the diaper. In the past, the different versions of lateral barriers have not had this characteristic that allows to achieve an effective, integral seal.

The sheets 60, 61 forming the side barriers or anti-drip barriers can be waterproof or permeable although preferably, but not necessarily, they are impermeable. If they are permeable, they can be treated with a hydrophobic agent, to repel liquids. In any case, the operation of the barriers is highly innovative, since the impermeable material 62 is effectively anchored to the wrapping material 61 of the absorbent core 50, thus providing an effective seal.

The lateral barriers can be arranged in the entire longitudinal extension of the absorbent core 50, that is, almost the entire longitudinal extension of the diaper itself, except for a small portion at the waist ends of the diaper, to facilitate its sealing to the rest of the diaper particularly at the top sheet of it.

Particularly, as seen in Figure 5, the use of the partial shell 51 of the absorbent core 50 for anchoring impermeable material 62 provided between the sheets 60 and 61 forming the side barriers, provides a different system from the various side barrier approaches of the prior art, and thus provide the only absorbent article capable of fully containing the co-exudates in the area of the absorbent core, despite the movements of the user, since an integral, total seal is formed.

Also shown in Figure 5, with the reference number 15, are the elastics of the legs, used conventionally in disposable absorbent articles, such as disposable diapers. It can also be observed that there may be a certain free space between the area in which the elastics 15 and the anti-crash side barriers are arranged, since as an absorbent core 50 of smaller size than the conventional one is used, and the barriers coincide with the side edges of the absorbent core 50 of reduced size, there is a free zone between the elastics and the side barriers (and hence the side edges of the absorbent core).

With reference to figure 6, In it you can better appreciate the relationship of the elastics 15 (illustrated in curve form although they can be rectilinear, as is well known in the art) and the lateral barriers (and therefore the lateral edges of the absorbent core). Of course, this arrangement can be varied, bringing the elastic 15 closer to or further away from the barriers and the side edges of the absorbent core, to take into account factors such as the size of the user to whom the particular disposable absorbent article is intended.

In Figure 7 an alternative embodiment of the anchoring of the waterproof sheet 62 of the side barriers with the envelope 51 of the absorbent core is shown. This embodiment is particularly advantageous for the effects of an improved seal formed by the waterproof sheet 62 of the side barriers and the envelope 51 of the absorbent core. As seen in this figure, the envelope 51 of the absorbent core, instead of turning around the side edges of the absorbent core, extends laterally to the approximate area of the elastics 15, whereby the waterproof sheet 62 is anchored in the wrapper 51 at a point offset towards the elastics 15. This embodiment provides an improved seal, and is particularly suitable for use in disposable absorbent articles intended for users, by virtue of which the area where they expel the urine can cause an effect of blocking in the narrowest part of the diaper.

Although the invention has been described with reference to presently preferred embodiments thereof, it is clear that those skilled in the art will be able to devise a series of changes and modifications, all these changes and modifications falling within the spirit and scope of the invention. invention,. As defined in the appended claims.

Claims (6)

Claims

1. Improved disposable absorbent article comprising an upper sheet (18) formed of a non-woven fabric, a backing sheet (11), and an absorbent core (16) to be placed between the back sheet (11) and the top sheet (18) ), characterized in that the backing sheet (11) is formed of a non-woven fabric or a similar material with a fabric appearance and that between the absorbent core (16) and the backing sheet (11) a film impermeable to the liquids (17) limited by the lines (28) and (27), said impermeable film (17) in combination with the absorbent core (16) provides liquid impermeability and prevents run-off

2. An improved disposable absorbent article according to claim 1, characterized in that the upper sheet (18) of non-woven fabric is laminated with the non-woven fabric of the backing sheet (11) to provide respirable areas in the portions (25) and in the upper areas adjacent to the lines (28) where there is no absorbent material.

3. Disposable absorbent article improved in accordance with claim 2, characterized in that the laminated structure includes a bulging or cushioned appearance.

4. Disposable absorbent article improved according to claim 1, characterized in that the lines (27) can coincide with anti-sinking barriers placed on the upper sheet (18).

5. Disposable absorbent article improved according to claim 1, characterized in that the backing sheet (11) receives a treatment to confer hydrophobic properties.

6. An improved disposable absorbent article according to claim 5, characterized in that the backing sheet (11) is treated with a hydrophobic agent on its inner surface to confer hydrophobic properties in order to repel any moisture that could be filtered. Improved disposable absorbent article characterized in that the absorbent core (16) is arranged in a rectangular arrangement using laminated cellulose folded in three parts with central portion being provided with superabsorbent polymers (60) or hydrogel-forming polymers. An improved disposable absorbent article according to claim 7, characterized in that the superabsorbent polymers (60) are arranged in the central portion (50) of the absorbent core (16) with the aid of an adhesive.