MXPA06014526A - Compression resistant nonwovens - Google Patents

Abstract

A sanitary napkin comprising a top sheet comprising a plurality of discrete tufts of fibrous material, wherein the top sheet has a density of less than 0.027 g/cc under a load of 0.02756Kla (0.004 psi), and a density of less than 0.0688/cc at a load of 1.5847Kla (0.23 psi).

Description

NON-WOVEN FABRICS RESISTANT TO COMPRESSION FIELD OF THE INVENTION This invention relates to fibrous webs such as non-woven fabric webs suitable for use as a top canvas in a disposable absorbent article. In particular, this invention relates to fibrous webs treated by mechanical forming to increase the compressive strength.

BACKGROUND OF THE INVENTION Disposable absorbent articles such as baby diapers, adult incontinence products, sanitary napkins, pantiliners, hemorrhoids treatment cloths, bandages and the like are well known in the industry. Said articles generally have a liquid-permeable upper canvas, and a lower liquid-impermeable canvas, and an absorbent core placed between the upper canvas and the lower canvas to absorb the liquid exudates from the body. In some applications of disposable absorbent articles, such as sanitary napkins and pantiliners, it is not only desirable to absorb body fluids, but also to minimize the amount of liquid on the wearer's body. The liquid on the wearer's body can be minimized by ensuring that the liquid enters the absorbent core and does not leave there when pressed or squeezed in the course of normal use of the absorbent article, that is, when sitting or walking. While much work has been done to minimize rewetting of the body, there still remains a need for a disposable absorbent article that will help Keep the user's body clean and dry. Accordingly, there is a disposable absorbent article that provides the benefit of keeping the body clean in the field of sanitary napkins and pantiliners. Additionally, there is a need for a method for relatively inexpensive production of a disposable absorbent article that helps provide the benefit of a clean body in the field of sanitary pantiliners.

BRIEF DESCRIPTION OF THE INVENTION A sanitary napkin comprising an upper canvas comprising a plurality of tufts of different fibrous material, wherein the upper canvas has a density of less than 0.027 g / cc under a load of 0.028 kPa (0.004 psi) and a density of less than 0.068 a a load of 1.59 kPa (0.23 psi).

BRIEF DESCRIPTION OF THE FIGURES Figure 1 is a perspective view of a frame of the present invention. Figure 2 is an enlarged view of a portion of the weft shown in Figure 1. Figure 3 is a cross-sectional view of section 3-3 of the Figure 2. Figure 4 is a plan view of a portion of the frame as indicated in Figure 3, 4-4. Figure 5 is a perspective view of an apparatus for forming the weft of the present invention. Figure 6 is a cross-sectional view of a part of the apparatus of the Figure 5. Figure 7 is a perspective view of a part of the apparatus for forming a frame mode of the present invention. Figure 8 is an enlarged perspective view of a part of the apparatus for forming the screen of the present invention. Figure 9 is an enlarged view of a portion of another embodiment of a frame of the present invention. Figure 10 is a plan view with a partial cut of a sanitary napkin of the present invention.

DETAILED DESCRIPTION OF THE INVENTION The present invention can be used in any of the known disposable absorbent products. In a preferred embodiment, however, the present invention comprises a sanitary napkin for use as a menstrual cloth. The sanitary napkin of the present invention comprises at least three components: an upper canvas, a lotion applied to the upper canvas, and an absorbent core in liquid communication with the upper canvas. Unexpectedly it has been observed that, by using the web of the present invention, a sanitary napkin of the present invention can provide the desired benefit of keeping the user's body clean. Specifically, the sanitary napkin of the present invention provides a better compressive strength, comparable to that of known formed film webs, such as the DRI-WEAVE® top canvas used in the ALWAYS® sanitary napkins marketed by The Procter & Gamble Co. The improved resistance to compression optimizes the rewetting properties of the sanitary napkin, so that the amount of liquid that remains on the body of the user, or that the product expelled back to the body of the user, is much lower . Conversion factors for units used here: 1 inch = 25.4 mm; 1 psi = 6.89 kPa; 1 foot = 304.8 mm. Figure 1 shows a laminated weft 1 suitable for use as a compression resistant top canvas in a disposable absorbent article of the present invention. The frame 1 may comprise a layer, but in a preferred embodiment it comprises at least two layers. In the present document, the layers are generally referred to as two-dimensional planar precursor frames, such as the first precursor web 20 and the second precursor web 21. In a preferred embodiment, both precursor webs are non-woven webs. The precursor webs 20 and 21 (as well as any additional webs) can be joined by adhesive, hot melt bonding, ultrasonic bonding and the like, but preferably they must be joined without the use of adhesive or other bonding. As described below, the constituent precursor frames of the weft 1 may be joined by the mechanical interlocking engagement resulting from the formation of the strands 6. The weft 1 has a first side 3 and a second side 5, the term being used herein "sides" according to their common use referred to generally flat, two-dimensional frames, such as paper and films that have two sides when they are generally flattened. Each precursor frame 20 and 21 has a first surface 12 and 13, respectively, and a second surface 14 and 15, respectively (are illustrated in Figure 3). The frame 1 has a machine address (MD) and a cross machine direction (CD), as is commonly known in the frame manufacturing industry. Although the present invention can be made with polymeric films and woven webs, in a preferred embodiment both precursor webs are non-woven webs composed of fibers oriented in a substantially random manner. By "oriented in a practically random manner" it is understood that, due to the processing conditions of the precursor web, there may be a greater amount of fibers oriented in MD than in CD, or vice versa. For example, in the spunbond and meltblown processes, continuous strands of fibers are deposited on a support that moves in MD. Despite attempts to make the orientation of the fibers of the non-woven fabric spun by bonding or blown fusing actually "random", there is usually a slightly higher percentage of fibers oriented in MD as opposed to what happens with those oriented on CD. In a preferred embodiment, the first precursor web 20 is a relatively hydrophilic nonwoven web and a second web 21 is a nonwoven web that is a relatively hydrophobic nonwoven web. For all non-woven fabric webs, hydrophobicity or hydrophilicity can be achieved by using fibers having the appropriate characteristics, or precursor webs that can be treated to have the desired characteristics. In one embodiment, the first side 3 of the frame 1 is defined by the exposed portions of the first surface 13 of the second precursor frame 21 and at least one, but preferably a plurality of separate tufts 6, which are integral extensions of the fibers of at least the first precursor web 20 and preferably both precursor webs. As shown in Figure 3, each lock 6 can include a plurality of aligned linked fibers 8 which extend through the second precursor web 21 and in an outward direction from the first surface 13 thereof. In another embodiment, each tuft 6 may comprise a plurality of unbonded fibers 18 (as illustrated in Figure 3) extending outward from the first surface 13. In one embodiment, the tufts 6 may comprise fibers from both frames precursors. In this embodiment, the fibers of the first precursor web 20 are formed inside the tuft, with fibers from the second precursor web that practically cover the outside of the tuft. As used herein, the term "non-woven fabric web" refers to a web having a structure of individual fibers or threads that are interleaved but do not follow a pattern as in the case of a woven web, and that do not have fibers that are usually oriented randomly. Many processes have been used to form the fabrics or webs of non-woven fabric, for example melting and blowing processes, thermal consolidation, hydroentangling, laying in the air and bonding and carding processes including heat sealing and carding. The fibers can be bicomponent, multi-component, multi-constituent and the like, as is known in the industry. The basis weight of non-woven fabrics is usually expressed in grams per square meter (gm2). The basis weight of the laminated web is the result of the combination of the basis weight of the constituent layers and any other aggregate component. The diameters of the fibers are usually expressed in microns; Fiber size can also be expressed in denier, which is a unit of weight per fiber length. The basis weight of the laminated webs suitable for use in the present invention may range from 10 gm2 to 500 gm2. The constituent fibers of the precursor webs 20 or 21 of non-woven fabric may be composed of polymers such as polyethylene, polypropylene, polyester and combinations of these. The fibers may be composed of cellulose, rayon, cotton or other natural materials or combinations of natural and polymeric materials. The fibers can also be composed of a superabsorbent material such as polyacrylate or any combination of suitable materials. The fibers may be monocomponent, bicomponent and / or biconstituent, unrounded (e.g., capillary channel fibers) and may have important transverse dimensions (e.g., the diameter of the round fibers) of between 0.1 and 500 micrometers. For example, one type of fibers suitable for the nonwoven fabric web includes the nanofibers. Nanofibers are described as fibers having an average diameter of less than 1 micrometer. All fibers or a portion of the fibers of a nonwoven fabric web can be nanofibers. The constituent fibers of the nonwoven fabric precursor web can also be a mixture of different types of fibers, with different characteristics such as chemistry (for example, PE -polyethylene- and PP -polypropylene), the components (mono- and bi- ), the denier (micro denier and> 20 denier), the shape (ie, capillary and round) and the like. The constituent fibers may vary from about 0.1 to 100 denier. As used herein, "spunbond" refers to small diameter fibers that are formed by extruding molten thermoplastic material such as filaments of a plurality of thin, generally circular, single-filament capillaries, thus rapidly reducing diameter of the extruded filaments. In general, fibers spun by bonding do not adhere when deposited on a collecting surface. The fibers spun by bonding are generally continuous and have an average diameter (of a sample of at least 10) greater than 7 micrometers and more specifically between about 10 and 40 micrometers. As used herein, the term "melted and blown fibers" refers to fibers formed by extruding a molten thermoplastic material through a plurality of fine capillaries, usually circular, in a die, in the form of melted filaments or filaments in a gas stream (eg, air) at high velocity which attenuates the filaments of molten thermoplastic material to reduce its diameter, which can be effected until reaching the diameter of a microfiber Next, the melted and blown fibers are transported by the high-velocity gaseous stream and are deposited in a collecting surface, usually while still retaining the adhesion to form a web of dispersed melted and blown fibers in a random way. The melted and blown fibers are microfibers which may be continuous or discontinuous with an average diameter generally less than 10 microns. As used herein, the term "polymer" generally includes, but is not limited to, homopolymers, copolymers, such as, for example, copolymers, thermopolymers, etc. in block, grafted randomly and alternately, and mixtures and modifications of these. In addition, unless otherwise stated, the term "polymer" includes all possible geometric configurations of the material. The configurations include, but are not limited to, isotactic, atactic, syndiotactic and random symmetries. As used herein, the term "monocomponent" fiber refers to a fiber formed by one or more extruders that use only one polymer. This term is not intended to exclude fibers formed from a polymer to which small amounts of additives have been added to provide coloration, antistatic properties, lubrication, hydrophilicity, etc. These additives, for example titanium dioxide to provide coloration, are generally present in amounts of less than about 5 weight percent, and more often to about 2 weight percent. As used herein, the term "bicomponent fibers" refers to to fibers formed from at least two different polymers exempted from different extruders, spun together to form a fiber. Bicomponent fibers are sometimes referred to as conjugated fibers or multicomponent fibers. The polymers are formed in practically different areas constantly positioned across the cross section of the bicomponent fibers and extend continuously along the length of the bicomponent fibers. The configuration of said bicomponent fiber can be, for example, a sheath / core type distribution where one polymer is surrounded by another or have a side-by-side, pastel-type or "archipelago" type configuration. As used herein, the term "biconstituent fibers" refers to fibers formed from at least two extruded polymers of the same extruder as a mixture. The biconstituent fibers do not have the different polymeric components configured in different zones positioned relatively constant across the cross-sectional area of the fiber and the different polymers are generally not continuous along the total length of the fiber but form fibrils that start and end randomly. Sometimes the term multi-constituent fibers is used to refer to biconstituent fibers. As used herein, "non-round fibers" describes fibers that have a non-round cross section and include "shaped fibers" and "capillary channel fibers". These fibers can be solid or hollow and trilobal or delta-shaped; preferably, they are fibers that have capillary channels on their outer surfaces. The capillary channels can have different shapes in the cross section, such as "U", "H", "C" and "V". A preferred capillary channel fiber is T-401, designated as 4DG fiber, which is available from Fiber Innovation Technologies, Johnson City, TN. The T-401 fiber is a polyethylene terephthalate (polyester) PET). As used herein, the term "integral" as in the phrase "integral extension", when used for the tufts 6, refers to the fibers of the tufts 6 that originated in the fibers of the precursor frames. For example, the fibers in the tufts 6 can be integral with the first precursor frame 20, that is, originate therein. Accordingly, the bonded fibers 8 and the unbonded fibers 18 of the tufts 6 can be plastically deformed fibers extending from the first precursor web 20 and, therefore, are integral to the first precursor web 20. As used in US Pat. the present, "integral" should be distinguished from the fibers introduced or added to a separate precursor web, as is commonly done, for example, in conventional carpet manufacturing. The amount, spacing and dimensions of the strands 6 can be varied to give various textures to the first side 3 of the frame 1. For example, if the strands 6 are spaced close enough, the first side 3 of the frame 1 can have the feeling from the plush to towel. Alternatively, the strands 6 may be arranged in patterns such as lines or filled shapes so as to create portions of a laminated weave that gives it greater texture, smoothness, volume, absorbency or visual design aspect. For example, when the tufts 6 are arranged in a pattern of one or more lines, the tufts may have the appearance of sewing. The strands 6 may also be arranged to form specific shapes, such as designs, words or logos. These forms can be used, for example, in laminates useful for towels or bathrobes of hotels and can include the name or logo of the hotel in them. In the same way, the size dimensions, such as height, length and width of the individual tufts can be varied 6. The individual tufts can have a length of up to about 3 cm and can be found alone or dispersed between tufts of different sizes. The first precursor web 20 can be a fibrous web of woven or non-woven fabric comprising fibers whose elongation properties are sufficient for some portions to be formed into strands 6, as described below in detail. The tufts are formed by forcing the fibers out of the plane in the Z direction into distinct and localized portions of the precursor frames. The reason why the fibers leave the plane may be due to the displacement of the fibers, that is, the fiber moves relative to other fibers and, so to speak, may be "taken out" of the plane. More frequently, however, most of the pre-weft webs of non-woven fabrics are forced out of the plane because the fibers of the tufts 6 have been, at least partially, plastically stretched and permanently deformed to form the fibers. tufts 6. Therefore, in one embodiment, depending on the desired height of the tufts 6, the fibers constituting the precursor webs of non-woven fabrics can have an elongation for breaking of at least about 5%, more preferably at least about 10%, more preferably at least about 25%, more preferably at least about 50%, and most preferably at least about 100%. The elongation of rupture can be determined by means of a simple stress test, for example by using the Instron tensile test equipment, and generally material data sheets can be found in suppliers of such fibers or frames. It can be appreciated that suitable precursor webs should comprise fibers that can be plastically deformed and elongate by tension, or fibers that have sufficient mobility to form the bonded fibers 8. However, it is admitted that a certain percentage of the fibers forced out of the plane of the first surface 12 will not form loops, but rather will break to form ends loose. Those fibers are referred to herein as "loose" fibers or "loose fiber ends" 18 as shown in Figure 3. In the present invention, the ends of loose fibers 18 are not necessarily undesirable and in some embodiments, the majority or all the strand fibers 6 can be ends of loose fibers 18. The loose ends fibers 18 can also be the result of forming strands 6 of nonwoven fabric webs that are formed or contain fibers of cut strands. In such a case, a number of ends of cut fiber strand may protrude into the strand 6, which will depend on factors such as the amount of staple strand fibers existing in the weft, the length of the cut of the strands of fibers and the height of the tufts. In some cases it may be convenient to mix fibers of different lengths in a precursor web or in different layers. This can be done to selectively separate the longer fibers from the shorter fibers. The longer fibers may predominate in the tuft 6 while the shorter fibers remain mainly in the portion of the weft that does not form that strand 6. An example of a mixture of fiber lengths may include fibers of approximately 2 to 8 centimeters for the fibers longer and less than about 1 centimeter for the shorter fibers. The first precursor web 20 may be a woven fibrous web or a nonwoven web comprising elastic or elastomeric fibers. Elastic or elastomeric fibers can stretch at least about 50% and return to a dimension within 10% of their original dimension. The strands 6 may be formed of elastic fibers if the fibers simply move due to the mobility of the fibers within the non-woven fabric, or if the fibers are stretched beyond their yield point and deformed plastically. The second precursor frame 21 can be virtually any raster material, with the sole condition that it has sufficient integrity to Become a laminar through the process described later. In one embodiment, the second precursor web may have sufficiently inferior elongation properties relative to the second precursor web 20, such that upon experiencing the tension of the fibers of the first precursor web 20 forcing movement out of the plane in the direction of the second precursor web 21, said second precursor web 21 is broken, for example, by tearing due to an extension failure, such that portions of the first precursor web 20 can extend through (i.e., "traverse") , so to speak) the second precursor web 21 for forming tufts 6 of the first side 3 of the web 1. In one embodiment, the second web 21 is a polymeric film. The second precursor web 21 may also have sufficient elongation properties to form bonded fibers, as described above with respect to the first precursor web 20. A representative lock 6 of the web mode 1 illustrated in Figure 1 (wherein the second precursor web 21 is "perforated" by the first precursor web) is shown in a more enlarged view in Figure 2. As illustrated in Figures 2 or 3, the tuft 6 comprises a plurality of crimped fibers 8 that are substantially aligned with each other. such that the tuft 6 has a different linear orientation and a longitudinal axis L. The tuft 6 also has a transverse axis T, generally orthogonal to the longitudinal axis L in the MD-CD plane. In the embodiment illustrated in Figures 1 and 2, the longitudinal axis L is parallel to the MD. In one embodiment, all the strands 6 separated from each other generally have parallel longitudinal axes L. The number of strands 6 per unit area of the weft 1, that is, the surface density of the strand 6, can be varied from 1 strand per unit area, for example, per square centimeter, to as much as 100 strands per centimeter square. Can have at least 10, or at least 20 strands 6 per square centimeter, which will depend on the end use. In general, the density of the area need not be uniform over the entire surface of the weft 1, but the strands 6 may be in only certain regions of the weft 1, such as in the regions having predetermined shapes such as lines, stripes, bands, circles and the like. As can be appreciated from the description herein, in many embodiments of the frame 1, the openings 4 of the second precursor web 21 will have a defined linear orientation and a longitudinal axis oriented parallel to the longitudinal axis L of its corresponding lock. 6. Likewise, the openings 4 also have a transverse axis, generally orthogonal to the longitudinal axis in the MD-CD plane. As illustrated in Figures 1-4, the tufts 6 can extend through openings 4 in the second precursor screen 21. The openings 4 are formed by locally breaking the second precursor screen 21 by the process described below in detail. The breaking may involve the second precursor web 21 being opened, so that the opening 4 remains as a simple two-dimensional aperture. However, in some materials such as polymer films, the portions of the second precursor fiber 21 can be deflected or forced out of the plane (i.e., the plane of the second precursor web 21) to form finlike structures, indistinctly referred to as fins. or fins 7 herein. The shape and structure of the fins 7 largely depend on the properties of the material of the second precursor web 21. The fins 7 can have the general structure of one or more fins, as illustrated in Figures 1 and 2. other embodiments, the flap 7 may have a structure similar to a volcano, as if the lock 6 were a rash emerging from the flap 7. In other embodiments, the flaps 7 may, virtually, completely cover the locks 6, such that they form a "cap" on the tufts 6. In one embodiment, the vanes 7 can extend significantly out of the plane, even up to a height similar, so to speak, to that of the same tufts 6. In this mode, the fins 7 can make the strands 6 more flexible and less susceptible to flattening as a result of the compression or bending force. In one embodiment, therefore, the laminated web 1 comprises at least two layers (i.e., the precursor webs 20 and 21), and both layers modify the tactile characteristics and the compressive strength of the tufts 6. The tufts 6 preferably they comprise bonded fibers from both precursor webs. Therefore, in a certain way, the tufts 6 can "pierce" the second precursor web 21 or the pressure can cause the tufts to "stay inside" of that second precursor web 21. In both cases, it can be said that the first and second webs precursors can be "locked" in place when they are coupled with openings 4 by means of friction. In some embodiments, for example, the lateral width of the opening 4 (ie, the dimension measured parallel to its transverse axis) may be less than the maximum width of the tooth that formed the opening (in accordance with the process described below). ). This indicates a certain degree of recovery in the opening which tends to prevent the lock 6 from going down through the opening 4. The frictional engagement of the tufts and the openings provides a laminated weft structure having a surface with permanent tufts on one side, which can be formed without adhesives or thermofusion. Since in some embodiments at least one of the layers (eg in Figures 1-4 a second precursor web 21 of tissue paper or polymeric film with a relatively low elongation capacity) does not provide a significant amount of material to the tufts 6 (as in the modalities illustrated in Figures 1-4), a The web 1 comprising a first nonwoven fabric precursor web 20 can be characterized as predominantly fibrous on the two sides of the web 1 where the fibers are provided only by the first nonwoven fabric precursor web 20. Therefore, the web spacing the strands 6 may be the minimum necessary to effectively cover the first side 3 of the frame 1. In that embodiment, the two sides of the frame 1 appear as non-woven fabric, but the two sides 3 and 5 have a different surface texture. Therefore, in one embodiment, the invention can be described as a sheet material of two or more precursor webs, wherein the two sides of the web are substantially covered by fibers of only one of the precursor webs. As illustrated in Figures 1-4, a feature of the tufts 6 may be the predominantly directional alignment of the fibers 8 or 18. For example, in describing the aligned crimped fibers 8 they may be said to have a significant or greater parallel vector component. to the Z plane in CD and the crimped fibers 8 have a substantially uniform alignment with respect to the transverse axis T when viewed in a flat view, as in Figure 4. "Curled" fibers 8 refers to fibers 8 that are integrated into the first precursor web 20 and beginning and ending in that web, but extending outwards in the Z direction from the first surface 13 of the second precursor web 21. By "aligned" with respect to the linked fibers 8 of the tufts 6 it is understood that the bonded fibers 8 are generally oriented such that, from a plan view, as shown in Figure 4, each of the bonded fibers 8 has a component a significant vector parallel to the transverse axis T and preferably a larger vector component parallel to the transverse axis T. In contrast, the unbonded fibers 18 are integral to the first precursor web 20, but only begin therein and have a free end extending outward in the Z direction from the first surface 13 of the second frame precursor 21. Loose fibers 18 may also have a generally uniform alignment, described as having a significant or greater vector component parallel to the Z-CD plane. For both bonded fibers 8 and loose fibers 18, alignment is a feature of the tufts 6 prior to any post-manufacturing deformation due to rolling on a roll or to compression during the use of a finished article. As used herein, a bonded fiber 8 oriented at an angle greater than 45 degrees of the longitudinal axis L from a plan view, as shown in Figure 4, has a significant vector component parallel to the transverse axis T. As shown in FIG. used herein, a bonded fiber 8 oriented at an angle greater than 60 degrees of the longitudinal axis L from a plan view, as shown in Figure 4, has a larger vector component parallel to the transverse axis T. In a preferred embodiment at least 50%, more preferably at least 70%, and more preferably at least 90% of the fibers 8 of the tuft 6 have a larger vector component parallel to the transverse axis T. If necessary, the orientation of the fibers can be determined using an augmentation device, such as a microscope equipped with an appropriate measuring scale. In general, for a non-linear fiber segment seen from a plan view, a straight line approximation can be used for both the longitudinal axis L and the linked fibers 8 in order to determine the angle of the linked fibers 8 of the axis longitudinal L. For example, in Figure 4 the fiber 8a is identified by a thick line, and its linear approximation 8b is shown as a dashed line. This fiber forms an angle of approximately 80 degrees with the longitudinal axis (measured in a left-handed direction from L). The orientation of the bonded fibers 8 of the locks 6 must contrast with the composition and orientation of the fibers in the first precursor web 20 whose fibers, in the case of the non-woven fabric webs, are oriented in a practically random manner. In a woven weft pattern, the bonded fibers 8 of the tufts 6 would be oriented in the same manner as described above, but the orientation of the fibers of the first precursor weft 20 could be associated with the specific fabric process used to make the weft, for example, a square weave pattern. In the embodiment illustrated in Figure 1 the longitudinal axes L of the tufts 6 are generally aligned in MD. The tufts 6 and, therefore, the longitudinal axes L, can, in principle, be aligned in any orientation with respect to MD or CD. Therefore, in general, it can be said that for each strand 6, the linked and aligned fibers 8 are generally aligned orthogonal to the longitudinal axis L such that they have a significant vector component parallel to the transverse axis T and, more preferably a larger vector component parallel to the transverse axis T. In some embodiments, as a result of the preferred method of forming tufts 6 described above, another characteristic of the tufts 6 comprising predominantly aligned crimped fibers 8 can be their generally open structure characterized by a open hollow area 10 which is defined internally by tufts 6, as illustrated in Figures 2 and 3. The hollow area 10 may have a wider or longer shape at the distant end 31 of the lock 6 and narrower in the base 17 of the strand 6. This form is opposite to the shape of the tooth that is used to form the strand 6. By "hollow area" it is not necessary to understand n area totally free of fibers; the term is applied to a general description of the overall appearance of the tufts 6. Therefore, it may be that in some tufts 6 there are loose fibers 18 or a plurality of loose fibers 18 in the hollow area 10. By hollow area " open "must be It should be understood that the two longitudinal ends of the lock 6 are generally open and free of fibers, so that the lock 6 can form something like a "tunnel" structure in an uncompressed state, as illustrated in Figure 3. , as a result of a preferred method for making the web 1, the second side 5 of the web 1 exhibits discontinuities 16 characterized by a generally linear notch defined by previously random fibers of the second surface 14 of the first precursor web 20 that have been forced by the teeth of the forming structure described in detail below in directional direction (ie in the "Z direction" generally orthogonal to the MD-CD plane as illustrated in Figures 1 and 3) forming tufts 6. The abrupt change of orientation exhibited by the previously randomly oriented fibers of the first precursor web 20 defines the discontinuity 16, which presents a line Such an entity can be described as a longitudinal axis generally parallel to the longitudinal axis L of the tuft 6. Due to the nature of many nonwoven webs useful for the first precursor webs 20, the discontinuity 16 can not be clearly distinguished as tufts 6. For this reason, the discontinuities 16 of the second side 5 of the frame 1 may go unnoticed and may, generally, not be detected unless the frame 1 is subjected to a thorough inspection. As such, the second side 5 of the weft 1 may have the appearance and feel of a first precursor weft 20 without tufts. Therefore, in some embodiments, the weft 1 may have a similar appearance and feel to the towel terry on the first side 3 and a relatively uniform and smooth appearance and feel on the second side 5; both sides are composed of fibers of the same nonwoven fabric web, ie, the first precursor web 20. In other embodiments, the discontinuities 16 may appear as openings and may be openings through the web 1 through the ends of the webs. strands 6 that They resemble a tunnel. From the description of the weft 1 comprising a first nonwoven fabric precursor weft 20 it can be seen that the fibers 8 or 18 of the strand 6 can originate in the first surface 12 or in the second surface 14 of the first precursor weft 20 and extend from said surface. Of course, the fibers 8 or 18 of the tuft 6 can also extend from the interior 28 of a first precursor web 20. As shown in Figure 3, the fibers 8 or 18 of the tuft 6 extend as they have been forced out of the generally two-dimensional plane of the first precursor frame 20 (ie, forced in the "Z direction" as shown in Figure 3). Generally, the fibers 8 or 18 of the tufts 6 comprise fibers integral with the fibers of the first precursor web 20 and extending therefrom. Therefore, from the above description, it is understood that a modality of the frame 1 can be described as a laminar web formed by selective mechanical deformation of at least a first and a second precursor frame; at least the first precursor web is a nonwoven web; the laminar web has a first side comprising the second precursor web and a plurality of distinct tufts, each of which comprises a plurality of tuft fibers as integral extensions of the first precursor web through the second precursor web and a second web side that comprises this first plot. The extension of the fibers 8 or 18 can be accompanied by a general reduction of the dimension of the fibers in the transverse direction (for example, the diameter of the round fibers), due to the plastic deformation of the fibers and the effects of the ratio of Poisson. Thus, the aligned bonded fibers 8 of the tuft 6 can have a smaller average fiber diameter than the fibers of the precursor web 20. believes that this reduction in the diameter of the fiber contributes to the feeling of softness perceived on the first side 3 of the weft 1, smoothness comparable with the cotton towel plush, which depends on the material properties of the first precursor weft. It has been found that the reduction in the transverse dimension of the fiber is the major intermediate between the base 17 and the distal portion 31 of the strand 6. It is believed that this is due to the preferred manufacturing method, as described in more detail more ahead. Briefly, as shown in Figure 3, it is believed that the portions of the fibers in the base 17 and in the distal portion 31 of the tufts 6 are adjacent to the tip of the tooth 1 10 of the roller 104 described in detail below, and they are locked and immobilized by friction during processing. Therefore, the intermediate portions of the strands 6 are more free to stretch or elongate and, consequently, may undergo a corresponding reduction in the dimension of the fibers in the transverse direction. Some fibers of the first precursor web 20 can laterally tighten the base 17 of the tuft 6. The base 17 of the tuft 6 can even be closed (if the fibers of the tuft 6 are close enough to touch) or remain open. In general, any opening in the base 17 is narrow. By closing, tapering, or compressing other fibers of the base 17, the strands 6 and the second precursor web 21 can be stabilized more easily. Figure 5 shows an apparatus and a method for making a frame 1 of the present invention. The apparatus 100 comprises a pair of mating rollers 102 and 104, each rotated about an axis A; said axes A are parallel in the same plane. The roller 102 comprises a plurality of ridges 106 and their corresponding grooves 108, which extend continuously around the entire circumference of the roller 102. The roller 104 is similar to the roller 102, but rather than having ridges that extend continuously around the entire circumference, the roller 104 comprises a plurality of rows of flanges extending in the circumferential direction, which have been modified to become rows of teeth spaced in the direction of circumference 110 that extend in a space ratio of at least about one part of the roller 104. The individual rows of teeth 110 of the roller 104 are separated by the corresponding slots 1 12. During operation, the rollers 102 and 104 are engaged in such a manner that the lips 106 of the roller 102 extend into the slots 112 of the roller 104 and the teeth 110 of the roller 104 extend into the grooves 108 of the roller 102. The coupling is shown in more detail in the cross-sectional representation of Figure 6, which is discussed below. Both or any of the rolls 102 and 104 can be heated by means known in the industry such as the use of cylinders loaded with hot oil or cylinders that are electrically heated. In Figure 5, the apparatus 100 is shown in a preferred configuration having a patterned roller, e.g., the roller 104, and a non-patterned grooved roller 102. However, in certain embodiments, it may be preferable to use two pattern rolls 104 having the same or different patterns, in the same or different corresponding regions of the respective rolls. Such an apparatus can produce frames with tufts 6 that protrude on both sides of the frame 1. An apparatus with teeth pointing in opposite directions on the same roller could also be designed. The weft produced with this apparatus would have strands 6 on both sides. The method for making a frame 1 of the present invention by means of a commercially viable continuous process is represented in Figure 5. To elaborate the frame 1, precursor frames are mechanically deformed, such as the first and second precursor frames 20 and 21 that can be described individually as generally flat and two-dimensional before processing them with the apparatus shown in Figure 5. "Plane" and "two-dimensional" means simply that at the beginning of the process the condition of the frames is generally flat with respect to the finished frame 1 having a three-dimensionality in the Z direction and out of a different plane as a result of the formation of strands 6. "Plane" and "Two-dimensional" does not imply a particular flatness, uniformity or dimensionality. The process and apparatus of the present invention is similar in many aspects to a process described in U.S. Pat. 5,518,801 entitled "Web Materials Exhibiting Elastic-Like Behavior" (Raster materials exhibiting elastic behavior); These materials are mentioned in the later patent literature as "SELF" plots, which means "Structural Elastic-like Film" (elastic structural film). However, there are significant differences between the apparatus and process of the present invention and the apparatus and process described in the '801 patent and those differences are apparent in the respective frames produced in that way. As described below, the teeth 110 of the roller 104 have a specific geometry associated with the leading and trailing edges which allow the teeth to virtually "traverse" the precursor webs 20 and 21 as opposed to essentially deforming the web. In a two-layered web 1, the teeth 110 force the fibers from a precursor web 20 simultaneously out of plane and through the second precursor web 21, which is perforated, as it were, by the teeth 110 which force the fibers. To form the tufts 6. Therefore, a frame 1 of the present invention can have strands 6 of end fibers 18 and / or strands 6"tunnel type" of aligned bonded fibers 8 extending through the surface 13 of a first side 3 and far from it, unlike the "carp-shaped" rib-like elements of the SELF frames, each of which has continuous side walls associated therewith, ie a continuous "transition zone" and where none of the layers penetrates through another. The precursor plots 20 and 21 are supplied directly from their respective processing processes of the weft or indirectly from feeding rollers (none shown) and are moved in the machine direction to the grip point 116 of the counterrotary rollers that 102 and 104 are coupled. The precursor frames are preferably maintained with a frame tension sufficient to enter the grip point 16 in a generally flattened condition according to means which are well known in the frame handling industry. As each precursor web 20 and 21 passes through the grip line 116, the teeth 1 10 of the roller 104 meshed with the slots 108 of the roller 102 simultaneously force the portions of the first precursor web 20 out of plane of said web and through the second precursor web 21 to form tufts 6. Actually, the teeth 110"push" or cause the fibers of the first precursor web 20 to "pierce" the second precursor web 21. As the tips of the teeth 110 pass through the first and second precursor webs 20 and 21 the portions of the fibers of the precursor webs that are oriented predominantly in the CD transverse to the teeth 110 are forced by the tooth 110 to exit the plane of the first precursor web 20. Fibers can be forced off the plane due to fiber mobility or by stretching and / or plastic deformation in the Z direction. The portions of the first pre-screen cursors 20 that were forced out of the plane by the tooth 1 0 can also push the fibers of the second precursor web 21 out of the plane, or they can traverse the second precursor web 21, (if it has a relatively lower extensibility), which will cause thus the formation of tufts 6 on the first side 3 of the frame 1. The fibers of the precursor frames 20 and / or 21, generally mostly parallel to the longitudinal axis L, ie, in the MD of the precursor frame 20, as the picture shows 1, are simply spaced apart by teeth 110 and remain practically in their initial random orientation. This is why the crimped fibers 8 can exhibit that exclusive orientation of the fibers in modalities as illustrated in Figures 1-4 and that orientation consists in that a high percentage of fibers of each strand 6 has a significant or greater parallel vector component. to the transverse axis T of the strand 6. From the preceding description it can be seen that when the fiber 1 is made by the apparatus and method object of the present invention, the precursor frames 20, 21 can have different material properties with respect to the elongation capacity in the case of failures of the precursor frames, for example, faults due to stress. In particular, the mobility of fibers and / or the elongation characteristics of a first precursor web 20 of non-woven fabric can be greater than those corresponding to the second precursor web 21, so that the mobility or elongation of the fibers of the first frame is sufficient to form locks 6 while the second precursor frame 21 is broken, ie not stretched sufficiently to form locks. However, in other embodiments, both precursor webs have sufficient elongation such that their fibers can be moved or stretched sufficiently to form tufts 6. The degree to which the fibers of the nonwoven web precursor webs can extend out of the web. Flat without plastic deformation may depend on the degree of union between the fibers of the precursor web. For example, if the fibers of a non-woven fabric precursor web are woven together loosely, they will have a greater chance of sliding side by side (i.e., moving relative to adjacent fibers by dragging) and, therefore, spreading further. easily out of the plane to form locks. On the other hand, the fibers of a precursor web of non-woven fabric that are more strongly bonded, for example, by high levels of thermal bonding, hydroentangling or the like, they may require a greater degree of plastic deformation for the extension of tufts outside the plane. Therefore, in one embodiment, the first precursor web 20 can be a nonwoven fabric web whose fibers are relatively unattached to one another and the second precursor web 21 can be a nonwoven web whose fibers are fairly joined together, so that the fibers of the first precursor web can extend out of plane, unlike the fibers of the second precursor web 21. When the force applied in the first precursor web 21 is sufficient, the fibers thereof tend to extend, while that the fibers of the second precursor web are broken by not being able to spread. The amount, spacing and size of the tufts 6 can be varied to change the amount, spacing and size of the teeth 1 10 and make the corresponding dimension changes that are necessary in the roller 104 and / or the roller 102. This variation, together with the possible modification in the precursor frames 20 and 21, it allows to make many varieties of frames 1 for different purposes. For example, when the web 1 is made with a first precursor web 20 comprising a woven fabric with a relatively high basis weight and plastically stretchable woven filaments in MD and CD and a second precursor web 21 with a relatively high basis weight, the material The non-woven synthetic polymer of relatively low stretch fabric could be used to make a porous and resistant soil cover, as an erosion control device useful to reduce the deterioration of the slope path and allow the growth of native vegetation in an unstable soil. Figure 6 is a cross-sectional view of a portion of the gear rollers 102 and 104 and the ribs 106 and teeth 110. As illustrated, the teeth 110 have a tooth height TH (note that TH can also be applied at the height of the flanges, in a preferred embodiment the height of the tooth and the height of the flange are equal), and 2 a spacing between tooth and tooth (or spacing between the ridges) referred to as the step P. As illustrated, the depth of the latch E is a measure of the level of engagement of the rolls 102 and 104 and is measured from the tip of the flange 106 to the tip of the tooth 110. The depth of the hitch E, the height of the tooth TH, and the step P can be varied as desired depending on the properties of the precursor plots 20 and 21 and the desired characteristics of the plot 1. For example, in general, the greater the gear level E, the greater the characteristics of elongation or mobility between fibers that the fibers of the first precursor web 20 must have. Also, the greater the desired density of the fibers is. the strands 6 (strands 6 per unit area of the frame 1), the smaller the step and the smaller the length of the tooth TL and the distance of the tooth TD, as described below. Figure 7 shows one embodiment of a roller 104 having a plurality of teeth 110 useful for making a weft 1 similar to a towel cloth with a first precursor web 20 of nonwoven fabric having a basis weight of approximately 60 grams per meter square to 100 grams per square meter, preferably 80 grams per square meter and a second precursor screen 21 of polyolefin film (e.g., polyethylene or polypropylene) having an approximate density of 0.91 to 0.94 and a basis weight of approximately 20 grams per square meter. An enlarged view of the teeth 110 is illustrated in Figure 8. In this roller embodiment 104, the teeth 110 have a uniform circumferential length TL measured generally from the leading edge LE to the trailing edge TE at the tip of the tooth 111 of approximately 1.25 mm and are spaced circumferentially uniformly from each other by a distance TD of about 1.5 mm. To make a towel plush weave 1 from a weft 1 having a total basis weight within the range of about 60 to about 100 grams per square meter, the teeth 110 of the roller 104 can have a length TL within the range of about 0.5 mm to about 3 mm and a TD spacing of about 0.5 mm to about 3 mm, a height of TH tooth within the range of approximately 0.5 mm to approximately 5 mm, and a P pitch of approximately 1 mm (0.040 inches) approximately 5 mm (0.200 inches). The engagement depth E can be from approximately 0.5 mm to approximately 5 mm (up to a maximum equal to the height of the TH tooth). Of course, E, P, TH, TD and TL can be varied independently from one another to achieve the desired size, spacing and area density for the strands 6 (number of strands 6 per unit area of the frame 1). As illustrated in Figure 8, each tooth 1 10 has a tip 11 1, a leading edge LE and a trailing edge TE. The tip of the tooth 1 1 1 is elongated and has a generally longitudinal orientation, corresponding to the longitudinal axes L of the tufts 6 and the discontinuities 16. It is estimated that to obtain the locks and bundles 6 of the plot 1 that can be described as being similar to towel terry, the E and the TE must be almost orthogonal with respect to the local peripheral surface 120 of the roller 104. Likewise, the transition of the tip 11 and the LE or the TE must be at a very sharp angle , such as a right angle, having a radius of curvature small enough so that the teeth 1 10 traverse the second precursor frame 21 in the LE and the TE. Unrestrained by theory, it is estimated that the transitions of the tips with relatively sharp angles between the teeth 1 10 and the LE and the TE allow the teeth 1 10 to pass through the precursor fibers 20 and 21"clearly", ie local and differentially, so that the first side 3 of the resulting frame 1 can be described more as "tufted" than "deformed". When it is processed from this way, no particular elasticity is imparted to the frame 1 beyond what the precursor frames 20 and 21 may have originally had. Without wishing to be bound by theory, it is estimated that if the fibers of the precursor webs have a very curvilinear shape, for example crimped fibers, the resultant strands 6 will have more bonded fibers 8 and fewer broken fibers 18 compared to the fiber conformations. more linear. It is estimated that such fiber configurations have less possibility of connecting between two adjacent teeth and, as a result, have a lower tendency to stretch beyond their breaking point and, therefore, have a greater possibility of forming loop structures. complete. Moreover, such curvilinear shaped fibers can be made by the use of eccentric bicomponent fibers, or bicomponent fibers side by side, such as bicomponent fibers formed by polyethylene and nylon. In preferred embodiments, the first and second precursor webs are non-woven webs with a minimum of inter-fiber linkages. For example, the precursor web may be a non-woven fabric web having a pattern of different thermal junctions, as is commonly known in the industry for nonwoven webs. However, in general, it is desirable to minimize the number of heat sealing points and maximize the spacing to allow optimal mobility and movement of the fibers during the formation of the strands 6. In general, the strands 6 are formed better and are more defined when fibers of relatively large diameter and / or a relatively high fiber break and / or fiber mobility are used. Although the frame 1 is described in the preferred embodiments as a two-layer frame made of two precursor frames, it is not necessary that it be limited to having two layers. For example, a laminate of three or more layers can be made with three precursor webs, provided that one of the precursor webs can be extended and pass through the openings of another layer to form tufts. For example, plot 1 could include the upper canvas, the secondary canvas and a core of a feminine hygiene product. In general, it is not necessary to use adhesives or other joining means to make a laminated web 1. The constituent layers of web 1 (for example, precursor webs 20 and 21 and any other layer) can be maintained in expensive laminate condition with face by the "locking" effect of the strands 6 that extend through the openings 4 in the second precursor frame 21. In some embodiments, it may be desirable to employ adhesives or thermal bonding, as well as any other attachment means, depending on the final use of the application of the weft 1. For example, a weft 1 comprising non-woven fabric webs of bicomponent fibers can be joined with pass-through air after the formation of the strands 6 to adhere the layers and increase the resistance taken off. In addition, it may be convenient to apply adhesive on at least a portion of one of the precursor webs. For example, in some embodiments, adhesive, chemical bonding, resin or powder bonding or heat sealing between the layers may selectively be applied in some or all regions of the precursor webs. In the case of adhesive application, for example, the adhesive can be applied continuously, such as by slot coating, or in discontinuous form, such as by spraying, extrusion and the like. The discontinuous application of adhesive can be done in the form of strips, bands, droplets and the like. In a multi-layered web 1, each precursor web has different material properties, giving the web 1 beneficial properties when it is used as a top web in a disposable absorbent article, such as a sanitary napkin. For example, the frame 1 comprising two (or more) frames precursors, for example, the first and second precursor plots, may have beneficial properties for liquid handling. For better handling of the fluids, for example, the first precursor web 20 may be composed of relatively hydrophilic fibers. The second precursor web 21 may be composed of relatively hydrophobic fibers. The tufts 6 of said frame could form an upper canvas having a relatively hydrophobic body-facing surface, with hydrophilic strands to extract the liquid from the body and make them pass through the upper canvas. The liquid deposited in the relatively relatively hydrophilic upper tufts can be rapidly transported out of the relatively hydrophobic layer towards the portion of the article which lies below the layer of the second precursor web (eg, the absorbent core). Without being limited by theory, it is believed that one of the reasons why a compressive strength of the weft 1 is observed is the generally vertical alignment of the fibers 8 and 18 of the strands 6. The fibers 8 and 18 form columns of directionally aligned supports that resist compression. Figure 10 shows a cutaway partial plan view of a sanitary napkin, wherein a weft 1 of the present invention is one of its components. In general, the sanitary napkin 200 comprises a lower canvas 202, an upper canvas 206 and an absorbent core 204 disposed between the upper canvas 206 and the lower canvas 202 that can be joined around the periphery 210. The sanitary napkin 1 may have extensions laterals, commonly called "fins" 208, designed to wrap the sides of the crotch region of the wearer's panties of sanitary napkin 1. Sanitary napkins, including upper cloths for use as a body-facing surface, are Well known in the industry and do not need detailed description of the various alternatives and optional designs. In addition to using weft 1 in sanitary napkins, it can be used in a diaper or incontinence product in adults or others disposable products for hygiene. However, it should be noted that the frame 1 can be used as a component or as a material or more of a lower canvas, core, upper canvas, secondary upper canvas or wings. The frame 1 can also have multiple layers and can be composed of a top canvas, secondary top canvas, core, bottom canvas or any number of layers. The weft 1 is especially useful as the upper canvas 206 of a sanitary napkin 200. The weft 1 is especially beneficial as an upper canvas 206 for sanitary napkins since during use it combines optimum properties of liquid acquisition and resistance to compression and also avoids rewetting the surface of the upper canvas 206 that is oriented towards the body. The rewet can be caused by at least two causes: (1) The displacement of the fluid absorbed due to the pressure on the sanitary towel 200; and / or (2) the moisture trapped within the upper canvas 206 or on it. In a preferred top canvas 206, the two properties, i.e. the acquisition and retention of the fluids are maximized, and the rewetting is minimized. In other words, preferably, a higher canvas will have high liquid acquisition rates and low levels of rewet. In a sanitary napkin of the present invention, the upper canvas 206 may have applied a composition in the form of a lotion. The composition in the form of a lotion may be any of the known lotions, such as lotions that include petrolatum, which may be beneficial to the wearer's skin. In a preferred embodiment, the lotion is also beneficial to keep the user's body clean. That is, preferably, the lotion makes the menstrual flow less susceptible to adhering to the body, hair and skin. Therefore, the lotion is preferably hydrophobic and makes the hair and skin hydrophobic. The lotion may be applied in any of the ways known in the art. industry to apply lotions to webs of non-woven fabrics. The lotion can be applied at the tips (ie, the distal ends) of the strands 6. It has been found that applying the lotion at the tips allows an efficient transfer of the lotion to the wearer's skin. Without being limited by theory, it is believed that the tufts act as small brushes that apply the lotion on the user's body when the user is in motion, such as walking. The lotion of the present invention may include those disclosed in U.S. Pat. num. 5,968,025; 6,627,787; 6,498,284; 6,426,444; 6,586,652; 3,489,148; 6,503,526; 6,287,581; 6,475,197; 6,506,394; 6,503,524; 6,626,961; 6, 149.934; 6,515,029; 6,534,074; 6,149,932 WO 2000038747; or EP-A 927,050. In addition to (or in place of) lotion-like treatments, the upper canvas 206 (or portions thereof) can be treated with other materials or compositions to make it sufficiently hydrophobic. For example, the upper canvas can be treated with silicone treatments, low surface energy treatments, fluorinated hydrocarbon treatments. In general, "relatively hydrophobic" refers to a material or composition having a contact angle with the liquid of at least about 70 degrees, preferably at least about 90 degrees. In general, a low surface energy means less than about 5.5 Pa (55 dynes per square centimeter), preferably less than about 2.6 Pa (26 dynes per square centimeter) and more preferably from about 3.0 to about 5.0 Pa (30 to about 50 dynes per square centimeter). In a preferred embodiment, the weft 1 is used as the upper canvas 206 together with an absorbent core of high capacity and absorption 204. In general, a core Preferred absorbent is an airborne core of the type described in U.S. Pat. num. 5,445,777 or 5,607,414. In a preferred embodiment, the absorbent core 204 is of the type generally referred to as HIPE foams, such as those described in U.S. Pat. num. 5,550,167; 5,387,207; 5,352.71 1 and 5.331, 015. In a preferred embodiment, the absorbent core 204 has a capacity at 30 cm, after desorption, less than about 10% of its free absorbent capacity; a capillary absorption pressure of about 3 to about 20 cm; a capillary desorption pressure of about 8 to about 25 cm; a resistance to compression deflection of approximately 5 to approximately 85% when measured under a confining pressure of 5.10 kPa (0.74 psi); and a free absorbent capacity of about 4 to 125 grams / gram. Each of these parameters can be determined as set forth in U.S. Pat. no. 5,550,167 issued on August 27, 1996 to DesMarais. One of the advantages of using HIPE foam or air laying cores as described is that they allow the absorbent core to be very thin. For example, an absorbent core of the present invention may have an average gauge (thickness) of less than about 20 mm, preferably less than about 10 mm, and the thickness may be less than about 5 mm. Table 1 included below shows compression data for frames of the present invention as well as comparative frames. In Table 1, samples nos. 1-3, 5 and 7 are comparative samples and samples nos. 4, 6 and 8-13 are plots of the present invention. Sample 1 is a polyethylene film formed comparable to the upper DRI-WEAVE® canvases used in the ALWAYS® sanitary napkins, which can be obtained from Tredegar Film Products, Terre Haute, IN. Sample 2 is a film formed of polyethylene manufactured by Tredegar Film Products, Terre Haute, IN, in accordance with the teachings of U.S. Pat. no. 4,629,643 issued to Curro et al. on December 16, 1986. Sample 3 is a 30 gm.sup.-per-batch yarn web composed of a 50/50 ratio of polyethylene and polypropylene bicomponent fibers (PE / PP) obtainable from BBA, Simpsonville, SC. Sample 4 is a frame of the present invention made with the frame of Sample 3 processed in accordance with the process described herein. Sample 5 is a carded nonwoven web composed of 50% bicomponent PE / PP fibers of 6 denier (dpf) and 50% by 6 denier PET fibers, which can be obtained from BBA, Simpsonville, SC. Sample 6 is made by the process described herein with the screen of sample 5. Samples 4 and 6 are made with a precursor screen by the process described herein. Samples 8-13 are made in accordance with the present invention by the use of two precursor webs, as described herein, and both precursor webs are characterized in that they provide fibers to the tufts, so to speak, in a nested configuration. In this way, the fibers of the second precursor web are not "traversed" but rather converted into a tuft together with the fibers of the first precursor web, where the two webs provide fibers to the tufts. The sample 8 is made by means of the process described herein from the lamination of two layers of the fibrous nonwoven fabric web of the sample 7. The first layer of the sample 7 comprises a 30 gm 2 weft of bicomponent fibers 50/50 PE / PP and the second layer is a 45 gm2 weave comprising 50% bicomponent fibers 50/50 PE / PP of 6 denier and 50% of fibers of PP of 9 denier. Both frames can be obtained at BBA, Simpsonville, SC. The sample 9 is made by the process described herein with a two-layer laminate characterized in that the first and second layers comprise a 30 gm2 frame of PE / PP bicomponent fibers, and the second layer is also a treated surfactant for imparting a relatively higher level of hydrophilicity, as is known in the industry. Frames of 30 gm2 can be obtained from BBA, Simpsonville, SC. Sample 10 is made by the process described herein with a laminate of two layers of fibrous webs of non-woven fabrics characterized in that the first layer comprises a 30 gm2 web of bicomponent PE / PP fibers, and the second layer is a web of 45 gm2 comprising 50% of 6 denier PE / PP bicomponent fibers and 50% of 6 denier PET fibers. Both frames can be obtained at BBA, Simpsonville, SC. The sample 1 1 is made by the process described herein with a laminate of two layers of fibrous webs of non-woven fabrics characterized in that the first layer comprises a 30 gm2 web of PE / PP bi-component fibers from Pegas, Czech Republic, and the second layer is a 45 gm2 weave comprising 50% bicomponent PE / PP fibers of 6 denier and 50% of 6 denier PET fibers, which can be obtained from BBA, Simpsonville, SC. Samples 12 and 13 are made by the process described herein with a laminate of two layers of fibrous webs of non-woven fabrics characterized in that the first layer comprises a 30 gm2 web with a 50/50 ratio of bicomponent PE / fibers. PP, and the second layer is a 45 gm2 weave comprising 50% PE / PP bicomponent fibers in a 50/50 and 50% ratio of 6 denier PET fibers.

Both precursor plots can be obtained from BBA, Simpsonville, SC. Each of the samples of the present invention included in Table 1 was processed in accordance with the present invention through the gripping line of the coupling rollers as described above., with a pitch P of 1.5 mm (approximately 0.060 inches), a tooth height TH of approximately 3.7 mm (approximately 0.145 inches), a tooth distance TD of 1.6 mm (approximately 0.063 inches) and a tooth length TL of 1 .25 mm (approximately 0.050 inches). DOE engagement depth and line speed are shown in Table 1 for each of the samples of the present invention. As shown in Table 1, the wefts of the present invention exhibit excellent density and specific volume properties under loads that simulate the loads experienced in the use of a sanitary napkin. For example, a pressure of 0.028 kPa (0.004 psi) may correspond to a pressure experienced while standing, while a pressure of 1.586 kPa (0.23 psi) may correspond to a pressure that is experienced when sitting on a soft surface. and a pressure of 0.75 may correspond to the pressure that is experienced when sitting on a hard surface.

Table 1: comparison of frames of the present invention Conversions: 1 inch = 25.4 mm; 1 psi = 6.89 kPa; 1 foot = 304.8 mm Table 1, continued Conversions: 1 inch = 25.4 mm; 1 psi = 6.89 kPa; 1 foot = 304.8 mm TEST METHODS The hollow volume and the specific volume can be determined by the following methods: HOLLOW VOLUME Hollow volume under compression was calculated at pressures of 0.028, 1.58 and 5.17 kPa (0.004, 0.23 and 0.75 pounds per square inch) using an MTS tensile tester. The stress tester measured the strength of resistance when the material was compressed between a moveable stage and a fixed base. The material was compressed at a constant speed with a force of 1000 g. The position of the stage and the force were recorded. The hollow volume for a given position of the stage was calculated by means of the following equation: W = (xn - x) (Am) (0.1 cm / mm) _ 1 M Pfitra Where: W = hollow volume of material, expressed in cubic centimeters gram x0 = initial position of the plate from the base, expressed in millimeters x = position of the plate with respect to the initial position, expressed in millimeters Am = surface of the material expressed in square centimeters M = mass of the material, expressed in grams Fiber = density of fiber, expressed in grams per cubic centimeter For plots made with multiple layers, the fiber density of the weft is the average weight of the density of each fiber: Pfibra total - (% in fiber weight) (Pfibral) + (% in weight fiber2) (Pfibra2) Where:% by weight = percentage of the weight of the fiber type in the frame or: % by weight = weight of the fiber in the composition x 1 00% Total weight of the composition The suitable equipment for this test could include the apparatus for tension tests (MTS model Alliance RT / 1 with software Test Works and 50 N in the load cell). The equipment must have a fixed base that is larger in size than the stage. The zero height between the stage and the base is set by lowering the stage until the first significant force is measured, the stage is then retracted by an increment, and the position of the crosshead is reset to zero. The length of the sample measurement for each sample is set by raising the plate above the fixed base to a distance greater than the initial thickness of the material. From this position, the plate is lowered until a force of 1 gf is applied to the sample. The position from zero height is recorded as the initial platen position (> ¾) and the crosshead position is reset to zero. In this test, a circular plate with a diameter of 4.9 cm was used to compress the materials against the base at a speed of 0.51 cm / min from 1 to 1000 gf. (pressure of 0.75 pounds per square inch). The stage was set again at the same speed as the initial stage position for each sample. The initial platen position or measurement length of the test varied depending on the thickness of the material as described above. The test was repeated five times with separate sample pieces, and the five results were averaged. Each sample of tested material had a surface greater than that of the stage, but smaller than that of the fixed base.

SPECIFIC VOLUME The specific volume under compression was calculated at pressures of 0.028, 1.58 and 5.17 kPa (0.004, 0.23 and 0.75 pounds per square inch) using an apparatus for MTS voltage tests. The stress tester measured the strength of resistance when the material was compressed between a moveable stage and a fixed base. The material was compressed at a constant speed with a force of 1000 g. The position of the stage and the force were recorded. The specific volume for a given position of the stage is calculated by the following equation: SV = 1 / Ptrama The frame density for a given position of the stage is calculated by the following equation: (x0 - x) (1002 cm2 / m2) Where: SV = volume of specific vacuum of material in cubic centimeters per gram Ptrama = density in grams per cubic centimeter of nonwoven fabric web x0 = initial position of the plate from the base, expressed in millimeters x = position of the plate with respect to the initial position, expressed in millimeters BW = mass of the material in grams per square meter The appropriate equipment for this test could include the apparatus for tension tests (MTS model Alliance RT / 1 with software Test Works and 50 N in the load cell). The equipment must have a fixed base that is larger in size than the stage. The zero height between the stage and the base is set by lowering the stage until the first significant force is measured, the stage is then retracted by an increment, and the position of the crosshead is reset to zero. The length of the sample measurement for each sample is fixed by raising the stage above the fixed base to a distance greater than the initial thickness of the material. From this position, the plate is lowered until a force of 1 gf is applied to the sample. The position from zero height is recorded as the initial platen position (x0) and the crosshead position is reset to zero.

In this test, a circular plate with a diameter of 4.9 cm was used to compress the materials against the base at a speed of 0.51 cm / min from 1 to 1000 gf. (pressure of 0.75 pounds per square inch). The stage was set again at the same speed as the initial stage position for each sample. The initial platen position or measurement length of the test varied depending on the thickness of the material as described above. The test was repeated five times with separate sample pieces, and the five results were averaged. Each sample of tested material had a surface greater than that of the stage, but smaller than that of the fixed base. As will be understood from the preceding description of the frames 1 and the apparatus 100 object of the present invention, many different frames structures 1 can be made without departing from the scope of the present invention, as expressed in the claims. For example, the upper sheet 206 may additionally be coated or treated with medicaments, cleaning liquids, antibacterial solutions, emulsions, fragrances or surfactants. Also, the apparatus 100 can be configured to form tufts 6 only in a portion of the weft 1 or to form various sizes or area densities of the tufts 6. Another advantage of the described process for making the wefts of the present invention is that the wefts can be produced in line with other weaving equipment or disposable absorbent articles. Also, before or after the process of the present invention, other solid state formation processes can be applied. For example, a web could be processed in accordance with the present invention and then perforated by means of a stretching process, such as that described in U.S. Pat. no. 5,658,639, issued to Curro et al. Alternatively, a material could be formed into a compound through various processes, such as a process described in the US publication. no. 2003/028, 165A1 of Curro et al. or using an annular roller, for example as described in U.S. Pat. no. 5,167,897 to Weber et al. and then processed in accordance with the present invention. In this way, the obtained frames can exhibit the combined benefits provided by the multiple modifications of the materials. All documents cited in the Detailed Description of the invention are incorporated in their relevant parts as reference in the present document; The citation of any document should not be construed as an admission that it constitutes a prior industry with respect to the present invention. While particular embodiments of the present invention have been illustrated and described, it will be apparent to those skilled in the industry that various other changes and modifications may be made without departing from the spirit and scope thereof. It has been intended, therefore, to cover all the changes and modifications within the scope of the invention in the appended claims.

Claims (10)

1. CLAIMS 1 . A sanitary towel that includes: a. A top sheet comprising a fibrous web of non-woven fabric and a plurality of different tufts of fibrous material, b. characterized because that upper canvas has a density less than 0.027 with a load of 0.028 kPa (0.004 psi) and a density less than 0.068 g / cc with a load of 1.58 kPa (0.23 psi).
2. 2. The sanitary napkin according to claim 1, further characterized in that the upper canvas comprises a first and a second precursor weft of non-woven fabrics.
3. The sanitary napkin according to claims 1 or 2, further characterized in that the upper canvas comprises at least two precursor frames, and the different tufts comprise fibers of each precursor screen.
4. 4. The sanitary napkin according to any of the preceding claims, further characterized in that the tufts of the material comprise a plurality of linked fibers.
5. The sanitary napkin according to any of the preceding claims, further characterized in that the upper canvas comprises two sides and two or more precursor frames, wherein both sides of the upper canvas are practically covered by fibers of only one of the precursor frames.
6. The sanitary napkin according to any of the preceding claims, further characterized in that the upper canvas comprises from 1 to 100 of the different tufts per square centimeter, preferably from 20 to 40 of the different tufts per square centimeter.
7. 7. A sanitary towel characterized by: a. An upper canvas having a side facing the body and comprising 10 to 50 different tufts of fibrous material per square centimeter; b. a composition in the form of a semi-solid lotion applied on at least a portion of the side facing the body of the upper canvas; and c. wherein that top sheet has a density less than 0.027 with a 0.028 kPa (0.004 psi) load and a density less than 0.068 g / cc with a load of 1.58 kPa (0.23 psi).
8. 8. The sanitary napkin according to claim 7, further characterized in that the lotion comprises petrolatum.
9. The sanitary napkin according to claims 7 or 8, further characterized in that the upper canvas comprises a first precursor web and a second precursor web, wherein at least one of the precursor webs is relatively more hydrophobic than the other precursor web.
10. 10. A sanitary towel characterized by: a. A top sheet comprising a first precursor web and a second precursor web, wherein at least one of the precursor webs is relatively more hydrophobic with respect to the other web home, and wherein the top web also comprises different tufts of web fibrous material. the first and second precursor frames, b. wherein said top sheet has a density less than 0.027 with a 0.028 kPa (0.004 psi) load and a density less than 0.068 g / cc with a load of 1.58 kPa (0.23 psi), and c. an absorbent core in liquid communication with the upper canvas, in which the absorbent core has an average thickness of less than around 7 mm; and d. an inferior canvas attached to the upper canvas.