disposable diapers

专利摘要:
DISPOSABLE DIAPERS The present invention relates to disposable absorbent diapers that are equipped with improved comfort, adaptation and liquid transport. The absorbent core of disposable absorbent diapers comprises at least one absorbent structure comprising a layer of substrate and an absorbent layer with channels.
公开号:BR112013031707B1
申请号:R112013031707-8
申请日:2012-06-08
公开日:2020-11-17
发明作者:Donald Carroll Roe；Carsten Heinrich Kreuzer；Rodrigo Rosati；Blanca Arizti；Hans Adolf Jackels；Ernesto G. Bianchi
申请人:The Procter & Gamble Company；
IPC主号:

专利说明:

FIELD OF THE INVENTION
[0001] The present invention relates to disposable diapers, which provide an improved adaptation in dry and wet state (i.e., when loaded with bodily fluids) and improved liquid transport provision. BACKGROUND OF THE INVENTION
[0002] Disposable absorbent articles for receiving and retaining body discharges such as urine or faeces are well known in the art. Examples of these include disposable diapers, "training pants" (children's underwear with a special thick lining between the legs used in the toilet use training phase) and adult incontinence items. Typically, disposable diapers comprise a liquid-permeable top layer that faces the wearer's body, a liquid-impermeable bottom layer that faces clothing and an absorbent core interposed between the liquid-permeable top layer and the bottom layer.
[0003] Since its introduction on the market, disposable diapers have been continuously optimized in terms of comfort, adaptation and functionality.
[0004] An important component of disposable absorbent articles is the absorbent core structure. The absorbent core structure typically includes absorbent polymeric material, such as hydrogel-forming polymeric material, also called absorbent gel material, MGA, or superabsorbent polymer, PSA. This absorbent polymeric material ensures that large amounts of bodily fluids, for example, urine, can be absorbed by the absorbent article during use and stored, thereby providing low rewetting and good skin dryness.
[0005] Traditionally, the absorbent polymeric material is incorporated into the absorbent core structure with cellulose or cellulosic fibers. However, over the years, a significant effort has been spent to produce thinner absorbent core structures that can still capture and store large amounts of discharged body fluids, in particular urine. So far, it has been proposed to reduce or eliminate these cellulose fibers from the absorbent core structures. To maintain the mechanical stability of the absorbent core structures, small amounts of thermoplastic adhesive material, such as fibrous thermoplastic adhesive material, can be added to stabilize the absorbent polymeric material. Consequently, absorbent structures that have permeability / porosity, reduced gel blockage, and that form stable structures, necessary for use or transportation, are provided.
[0006] However, it has been found that some absorbent core structures with reduced cellulose fiber content, while being very thin when not loaded with bodily fluids, can have an increased hardness when partially loaded or fully loaded, specifically in regions that comprise most of the absorbent capacity of the absorbent article, such as the anterior region and the region between the thighs of the diaper. Increased hardness is not desirable, as it reduces the ability of the absorbent article to adapt to the user's body once dressed. In addition, it has also been found that some absorbent core structures that comprise particles of absorbent polymer with a high absorption capacity swell significantly under load with body exudates. As a result, the volume of the absorbent article can increase significantly during use, specifically in those regions that comprise a large part of the absorbent capacity of the absorbent article, such as the anterior region and the region between the thighs of the diaper. Such an increase in volume can make the disposable article uncomfortable for the user. It has also been found that some of these absorbent core structures with reduced cellulose fiber content may have a reduced void volume, which negatively affects the rate of liquid capture.
[0007] Therefore, there is still a need for disposable diapers that have good liquid handling properties and that have an increased flexibility throughout the use of the article, and that provides, in particular, a better adaptation in the wet state. SUMMARY OF THE INVENTION
[0008] The invention relates to a disposable diaper that has transversal and longitudinal dimensions, and which comprises a lower layer, an upper layer and an absorbent core disposed between them. The absorbent core comprises at least one absorbent structure that comprises a substrate layer and an absorbent layer. The absorbent layer comprises particles of absorbent polymer and, optionally, cellulose fibers, supported by and immobilized on the substrate layer. The absorbent layer has transverse and longitudinal dimensions and thicknesses, a pair of opposing longitudinal edges that extend in the longitudinal dimension, a pair of opposing transverse edges that extend in their transverse dimension, and frontal regions, between the thighs and posteriorly arranged sequentially in the longitudinal dimension. A plane perpendicular to the central longitudinal geometric axis of the absorbent layer delimits two longitudinal portions. The absorbent layer comprises at least two channels substantially free of said absorbent polymeric particles which extend through their thickness in their longitudinal dimension, each longitudinal portion of the absorbent layer comprising one of said channels. Each channel has a width of at least 3 mm or at least 4% of the transverse dimension of the absorbent layer, extends over at least 15% of the longitudinal dimension of the absorbent layer, and is at least present in the region between the thighs or part of the same. The absorbent layer does not comprise channels substantially free of absorbent polymeric particles that extend in their transverse dimension in the region between the thighs, and do not comprise channels substantially free of absorbent polymeric particles that extend to their longitudinal and transverse edges. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 is a plan view of a disposable diaper.
[00010] Figure 2 is a perspective view of an absorbent structure comprising an absorbent layer with two longitudinal main channels.
[00011] Figure 3A is a perspective view of an absorbent layer comprising four main longitudinal channels.
[00012] Figure 3B is a top view of an absorbent structure comprising an absorbent layer with four main longitudinal channels.
[00013] Figure 3C is a perspective view of the absorbent structure of Figure 3B.
[00014] Figures 4A to 4E are schematic representations of the channels.
[00015] Figure 5 is a perspective view of an absorbent layer comprising two main longitudinal channels at least present in the region between the thighs, and two secondary longitudinal channels in the anterior region.
[00016] Figure 6 is a perspective view of an absorbent layer comprising two main longitudinal channels at least present in the region between the thighs, two secondary longitudinal channels in the anterior region, and two secondary longitudinal channels in the posterior region.
[00017] Figures 7 to 13 are schematic cross sections of an absorbent core taken in a transversal dimension.
[00018] Figure 14 is a schematic representation of a manufacturing process for an absorbent structure comprising an absorbent layer with channels. DETAILED DESCRIPTION OF THE INVENTION Definitions
[00019] For use in the present invention, "diapers" refers to devices that are intended to be placed against a user's skin to absorb and contain the various exudates discharged from the body. Diapers are generally used by babies and incontinent people around the lower torso to encircle the wearer's waist and legs. Examples of diapers include baby or adult diapers and pants-type diapers such as "training pants" (children's underwear with a special thick lining between the legs used in the toilet use training phase).
[00020] "Training pant", for use in the present invention, refers to disposable garments that have a waist opening and leg openings designed for babies or adult users. The pants can be put in position on the user by inserting the user's legs into the leg openings, then the pants are slid into position around the user's lower torso. Pants may be preformed by any suitable technique including, but not limited to, joining two portions of the article using joints that can be closed again and / or that cannot be closed again (for example, joining, solder, adhesive, cohesive connection, closure, etc.). The trousers can be pre-formed at any point on the circumference of the article (for example, closed at the side, closed at the front waist).
[00021] "Disposable" is used in the present invention to describe articles that, in general, are not intended to be washed in laundry or otherwise restored or reused (that is, they are intended to be discarded after a single use and can be recycled, composted or otherwise disposed of in a way that is compatible with the environment).
[00022] For use in the present invention, "absorbent structure" refers to a three-dimensional structure useful for absorbing and retaining liquids, such as urine. The absorbent structure may be the absorbent core of an absorbent article, or it may be part of the absorbent core of an absorbent article, i.e., an absorbent component of the absorbent core, as will be further described herein.
[00023] For use in the present invention, "absorbent core" refers to a component of an absorbent article typically disposed between an upper layer and a lower layer of an absorbent article. The absorbent core of an absorbent article can comprise one or more absorbent structures and, optionally, additional layers, such as a cover layer.
[00024] "Particles of absorbent polymer", for use in the present invention, refers to polymer particles substantially insoluble in water that can absorb at least 10 times their weight of a 0.9% saline solution in de-mineralized water , as measured using a Centrifugal Holding Capacity test (Edana 441.2-01).
[00025] "Non-woven material", for use in the present invention, refers to a blanket made of directionally or randomly oriented fibers, excluding paper and products that are woven, knitted, with tufts, needles ("stitch" -bonded ") incorporating binding threads or filaments or felted by wet milling, whether or not additionally needled. Non-woven materials and the processes for making them are known in the art. In general, the processes for the manufacture of non-woven materials comprise placing the fibers on a forming surface, which can comprise spinning deposition, blowing spinning, carding, air deposition, wet deposition, co-formation and combinations thereof. The fibers can be of natural or artificial origin and can be textile fibers or continuous filaments or be formed locally.
[00026] The term "base weight", for use in the present invention, refers to the mass of a material per unit area, that is, the mass of particles of absorbent polymer per unit area, for example, gram per meter square (gsm).
[00027] "Hot-melt adhesive", for use in the present invention, refers to adhesives in alignment with the description given in "Adhesion and Adhesives Technology: An Introduction", by Alphonsus V. Pocius (Hanser publishers, Munich, 1997). In it, a hot melt is defined as an adhesive applied from the molten material and which gains strength through solidification.
[00028] In the following description of the invention, the surface of the disposable diaper, or an element thereof, which faces the user's direction, during use, is called the "user-facing surface". Conversely, the surface facing the direction of the garment, during use, is called the "surface facing the garment". The disposable diaper, as well as any element of it, such as, for example, the absorbent structure, therefore, has a surface facing the user and a surface facing the garment.
[00029] Except where otherwise specified, the dimension or longitudinal length of an absorbent layer, for use in the present invention, is to be understood as the average length.
[00030] Except where otherwise specified, the transverse dimension or width of an absorbent layer, for use in the present invention, is to be understood as the average width. Disposable diapers
[00031] The disposable diaper 1, as illustrated in Figure 1, has a longitudinal dimension (along a longitudinal geometric axis A) and a transverse dimension (along a transverse geometric axis B) perpendicular thereto.
[00032] A portion of the diaper end is configured as a region of the anterior waist 2 (which is the front third of the article, which is one third of the length of the article). The opposite end portion is configured as a posterior waist region 3 (which is the posterior one-third of the article, which is one-third the length of the article). An intermediate portion of the diaper is configured as a region between the thighs 4 (which is the central third of the article). The region between the thighs extends longitudinally between the frontal and posterior waist regions. The region between the thighs is that portion of the diaper that, during use, is usually positioned between the user's legs.
[00033] The diaper typically comprises an upper layer 5, a lower layer 6 and an absorbent core 7 disposed between them.
[00034] The top layer can be liquid-permeable. The top layer can be at least partially hydrophilic. The so-called top layers with openings can also be used. Top layers with one or more (large) openings can also be used. The top layer can also include a skin care composition, for example, a lotion. The top layer can be fully or partially elasticized, or it can be shrunk to provide an empty space between the bottom layer and the absorbent core. Exemplary structures including elastified or shrunk top layers are described in more detail in US Patent No. 5,037,416, entitled "Disposable Absorbent Article Having Elastically Extensible Topsheet", granted to Allen et al. on August 6, 1991, and in US Patent No. 5,269,775, entitled "Trisection Topsheets for Disposable Absorbent Articles and Disposable Absorbent Articles Having Such Trisection Topsheets", granted to Freeland et al. on December 14, 1993.
[00035] The bottom layer may be vapor permeable, but impermeable to liquids. The bottom layer can be used to prevent fluids absorbed and contained in the absorbent core from wetting materials that come into contact with the absorbent article such as underwear, pants, pajamas, underwear, and shirts or jackets, acting as a barrier against transport of fluids. In certain embodiments, the bottom layer may be substantially impermeable to liquids (e.g., urine) and comprises a laminate of a nonwoven and a thin plastic film, such as a thermoplastic film that has a thickness of about 0.012 mm (0.5 mil) to about 0.051 mm (2.0 mils). Films suitable for the lower layer include those produced by Tredegar Industries Inc. of Terre Haute, Ind. And sold under the trade names X15306, X10962 and X10964. Other suitable lower layer materials may include breathable materials that allow vapors to escape from the diaper, while still preventing liquid exudates from passing through the lower layer. Examples of breathable materials may include materials such as fabric and non-woven fabrics, composite materials such as film-coated non-woven fabrics, and microporous films such as those produced by Mitsui Toatsu Co., Japan, under the designation ESPOIR NO, and by EXXON Chemical Co., of Bay City, TX, USA, under the name EXXAIRE. Suitable breathable composite materials containing polymer mixtures are available from Clopay Corporation, Cincinnati, Ohio, USA, under the name HYTREL blend P18-3097. Such breathable composite materials are described in more detail in PCT application No. WO 95/16746, published on June 22, 1995, in the name of E. I. DuPont. Other breathable lower layers including non-woven blankets and films formed with opening are described in US patent no. 5,571,096 granted to Dobrin et al. on November 5, 1996.
[00036] The absorbent core 7 is disposed between the upper layer and the lower layer of the absorbent article. The absorbent core may comprise one or more absorbent structures, as shown here.
[00037] The diaper may additionally comprise an anterior and posterior waist band and / or a fastening system, typically attached to the waist band, as known in the art. Preferred fastening systems comprise fastening flaps 8 and contact zones 9, with the fastening flaps being attached or attached to the region of the posterior waist of the diaper and the contact zones are part of the region of the anterior waist of the diaper. The diaper may also have leg clamps 10 and / or barrier clamps, such as elasticized barrier clamps 11. Suitable clamps are described, for example, in US 3,860,003, US 4,808,178 and 4,909, US 4,695. .278 and 4,795,454.
[00038] As illustrated in Figure 1, the absorbent core may comprise a capture system comprising an upper capture layer 12 and a lower capture layer 13 and, optionally, a core cover 14.
[00039] Processes for assembling the diaper include conventional techniques known in the art for the construction and configuration of disposable absorbent articles. For example, the lower layer and / or the upper layer can be attached to the absorbent core or to each other by means of a uniform and continuous adhesive layer, a conformed adhesive layer, or a set of lines, spirals or dots Separate Stickers. Adhesives considered satisfactory are manufactured by H. B. Fuller Company (St. Paul, Minnesota, USA), under the designation Hl-1258 or H-2031. Although the upper layer, the lower layer, and the absorbent core can be assembled in a variety of well-known configurations, the preferred diaper configurations are generally described in US Patent No. 5,554,145, entitled "Absorbent Article With Multiple Zone Structural Elastic-like Film Web Extensible Waist Feature ", Granted to Roe Et Al. On September 10, 1996, in US Patent No. 5,569,234, Entitled" Disposable Pull Article ", Granted to Buell Et Al. October 29, 1996, and US Patent No. 6,004,306, entitled "Absorbent Article With Multi-Directional Extensible Side Panels", granted to Robles Et Al. On December 21, 1999.
[00040] As indicated above, the absorbent core may comprise one or more absorbent structures that absorb and contain liquids, such as urine. The absorbent structure may be the absorbent core of an absorbent article, or it may be part of the absorbent core of an absorbent article. Absorbent structure
[00041] The absorbent structure 15 is a three-dimensional structure comprising a substrate layer 16 and an absorbent layer 17 comprising particles of absorbent polymer and, optionally, cellulose, supported by, and immobilized on, said substrate layer 16. Examples of absorbent structures 15 are illustrated in Figures 2, 3B and 3C.
[00042] The substrate layer has a longitudinal dimension that extends in the longitudinal dimension of the diaper, and a transverse dimension that extends in the transversal dimension of the diaper.
[00043] The absorbent layer has a longitudinal dimension M that extends in the longitudinal dimension of the diaper (i.e., the absorbent layer has a length M) and a transverse dimension N that extends in the transverse dimension of the diaper (i.e., the absorbent layer has a width N). The absorbent layer has a central longitudinal geometric axis x, a central transverse geometric axis y perpendicular to said central longitudinal geometric axis x, a pair of opposite longitudinal edges 18 which extends in the longitudinal dimension in the disposable diaper and a pair of opposite transversal edges 19 which extends across the transverse dimension of the disposable diaper. The longitudinal edges or transverse edges of the absorbent layer can be parallel to the central longitudinal axis or the central transverse axis (as shown in Figure 2), respectively, or they can follow the general direction of these axis while not being strictly parallel, for example , they can be curvilinear as, for example, to provide a narrower transverse dimension in the region between the thighs (as shown in Figures 3A, 5 and 6).
[00044] The central longitudinal axis x of the absorbent layer 17 delimits two regions of the absorbent layer, here called longitudinal regions 20 (the plane perpendicular to the central longitudinal axis divides the absorbent layer 17 into two longitudinal regions 20 arranged on either side of the said plan).
[00045] An end portion of the absorbent layer is configured as an anterior region 21 (which is the region oriented towards the anterior waist region of the disposable diaper) that constitutes about 25% of the longitudinal dimension M of the absorbent layer 17. A opposite end region is configured as a posterior region 22 (which is the region oriented towards the posterior waist region of the diaper) that constitutes about 25% of the longitudinal dimension M of the absorbent layer 17. An intermediate portion of the absorbent layer 17 is configured as a region between the thighs 23, which constitutes about 50% of the longitudinal dimension M of the absorbent layer. The anterior, between the thigh and posterior regions are sequentially arranged in the longitudinal dimension of the absorbent layer.
[00046] The substrate layer of the absorbent structure can be of any material capable of supporting the particles of absorbent polymer. Typically, it is a blanket or laminate material, such as foam, woven film and / or non-woven material. "Non-woven material", for use in the present invention, refers to a blanket made of directionally or randomly oriented fibers, linked by friction, and / or cohesion and / or adhesion, with the exception of papers and products that are woven , knitted, with tufts, needles ("stitch-bonded") that incorporate binding threads or filaments, or are felted by wet grinding, whether additional needles or not. Non-woven materials and the processes for making them are known in the art. In general, processes for the production of non-woven materials comprise two stages: depositing fibers on a forming surface and bonding the fibers. The fiber deposition stage can comprise direct deposition, spinning via blowing, carding, air deposition, wet deposition, co-form and combinations thereof. The fiber bonding step may comprise hydroentangling, cold calendering, hot calendering, thermosolding through air, chemical bonding, needle drilling, and combinations thereof. The non-woven material can be a laminate. The laminate may comprise continuous spinning layer (s) and / or meltblown blowing layer (s) (M) and / or carded layer (s) (C). Suitable laminates include, but are not limited to, SS, SSS, SMS or SMMS. The non-woven material can have a basis weight of about 5 to 100 g / m2, or about 10 to 40 g / m2, or about 10 to 30 g / m2. Woven or non-woven materials may comprise natural fibers or synthetic fibers, or combinations thereof. Examples of natural fibers may include natural cellulosic fibers, such as fibers from hardwood sources, softwood sources, or other non-woody plants. Natural fibers can comprise cellulose, starch and combinations thereof. Synthetic fibers can be any material, such as, but not limited to, those selected from the group consisting of polyolefins (polypropylene and polypropylene copolymers, polyethylene and polyethylene copolymers), polyesters (for example, polyethylene terephthalate), polyethers, polyamides , polyesteramides, polyvinyl alcohols, polyhydroxy alkanoates, polysaccharides, and combinations thereof. In addition, synthetic fibers can be single component (ie, a single synthetic material or a mixture that makes up the entire fiber), bicomponent (ie, the fiber is divided into regions, regions including two or more different synthetic materials or mixtures thereof, and may include coextruded fibers and core and sheath fibers) and combinations thereof. Two-component fibers can be used as a component fiber of nonwoven material and / or can be present to act as a binder for the other fibers present in the nonwoven material. All or any fibers can be treated before, during or after manufacture to alter any desired properties of the fibers.
[00047] The substrate layer 16 and the absorbent layer 17 can be coextensive, or the substrate layer 16 can be slightly longer and wider than the absorbent layer 17 (as shown in Figures 2, 3B and 3C.
[00048] The absorbent layer 17 comprises particles of absorbent polymer 50 and, optionally, cellulose. Particles of absorbent polymer will be described in more detail later in this document. The absorbent polymer particles can be used alone or in combination with other materials. In some embodiments, the absorbent layer comprises particles of absorbent polymer combined with cellulose. "Cellulose", for use in the present invention, refers to crushed wood pulp in the form of fibers, typically also called in the "airfelt" technique. In some embodiments, the absorbent layer comprises more than 70%, or more than 80%, or more than 90%, or more than 95%, or even 100%, by weight, of the absorbent polymer particles. In some other embodiments, the absorbent layer comprises particles of absorbent polymer and less than 5% by weight of cellulose, more typically less than 2% by weight of cellulose, and more typically the absorbent layer is cellulose free. In embodiments where the absorbent layer is cellulose-free, the absorbent layer comprises only particles of absorbent polymer. The resulting absorbent structures have a reduced thickness in their dry state compared to conventional absorbent structures comprising cellulosic fibers. The reduced thickness helps to optimize the adaptation and comfort of the absorbent article for the user.
[00049] The absorbent layer 17 comprises at least two channels 26 substantially free of particles of absorbent polymer, which extend through the thickness of the absorbent layer in the longitudinal dimension of the absorbent layer. Because they extend in the longitudinal dimension of the absorbent layer, this means that the channels essentially extend in the longitudinal dimension, that is, they extend more in the longitudinal dimension than in the transversal dimension, for example, at least twice as long in the longitudinal dimension that in the transversal dimension. These two channels are here called "longitudinal main channels".
[00050] In addition to these two longitudinal main channels 26, the absorbent layer 17 may comprise additional channels 26 ', here called "secondary channels".
[00051] "Channels", for use in the present invention, refer to distinct portions of the absorbent layer that extend through the thickness of the absorbent layer, which are substantially free of particles of absorbent polymer, that is, no particles of absorbent polymer are intentionally present in such a channel (longitudinal main channel or secondary channel) of an absorbent structure. However, it should be understood that, accidentally, a small negligible amount of absorbent polymer particles may be present in the channel, which does not contribute to the total functionality (for example, absorbency of the absorbent structure). Typically, channels have two transverse edges (in the shortest dimension) and two longitudinal edges (in the longest dimension) passing between the transverse edges. The transverse edges of the channels can be straight (that is, perpendicular to the longitudinal side edges), angled or curved. The channels have an average width w of at least 3 mm (the mean of a channel is defined as the average distance between the longitudinal lateral edges), or at least 4% of the width of the absorbent layer. In some embodiments, the longitudinal grooves can have complex shapes: the grooves may not end on a straight, angled or curved transverse edge, but they may have one or more branches on one or two of their end edges (here called branched grooves) . The branches also have longitudinal edges and a transverse border. The channels, as well as their branches, have an average width w of at least 3 mm, or at least 4% of the width of the absorbent layer.
[00052] The channels are preferably permanent. By permanent, it is understood that the integrity of the channels is at least partially maintained in both dry and wet states, that is, the channels are resistant to friction caused by the movements of the diaper user and resist wetting by body fluids, such as urine . Permanent channels are obtained by immobilizing the particles of absorbent polymer on the substrate layer, as well as by applying a thermoplastic adhesive material on the absorbent layer. Alternatively, the channels can be made permanent by flexing the substrate layer into the channels or allowing the substrate layer to enter the channels in order to immobilize the absorbent polymer particles, as will be described in greater detail later in this document. .
[00053] The absorbent cores (7) of the invention can comprise, in particular, permanent channels formed by the connection of the first substrate layer (16) and the second substrate layer (16 ') through the channels. Typically, glue can be used to connect both layers of substrate through the channel, but it is possible to make this connection through other known means, for example, ultrasound bonding, or heat bonding. The support layers can be connected continuously or intermittently connected along the channels.
[00054] The Wet Channel Integrity Test described below can be used to test whether the channels are permanent after wet saturation and to what extent. Wet channel integrity test
[00055] This test is designed to check the integrity of a channel after wet saturation. The test can be performed directly on an absorbent structure or on an absorbent core containing the absorbent structure. 1. The length (in millimeters) of the channel is measured in the dry state (if the channel is not straight, the curvilinear length across the middle of the channel is measured). 2. The absorbent structure or core is then immersed in 5 liters of a "saline solution" of synthetic urine, with a concentration of 9.00 g of NaCl per 1,000 ml of the solution, prepared by dissolving the appropriate amount of sodium chloride in distilled water The temperature of the solution must be 20 +/- 5 ° C. 3. After 1 minute in the saline solution, the absorbent structure or core is removed and held vertically by one end for 5 seconds for drainage, then it is spread flat on a horizontal surface, with the side facing the piece of clothing facing downwards, if that side is subject to recognition. If the absorbent structure or core comprises extension elements, the absorbent structure or core is pulled until it is tight in both X and Y dimensions, so that no contraction is observed. The ends / edges of the structure or absorbent core are fixed to the horizontal surface, so that no contraction can occur. 4. The absorbent structure or core is covered by a suitably heavy rigid plate, with the following dimensions: length equal to the extended length of the absorbent structure or core, and width equal to the maximum width of the absorbent structure or core in the transverse direction. 5. A pressure of 18.0 kPa is applied for 30 seconds over the rigid plate area mentioned above. The pressure is calculated based on the total area covered by the rigid plate. The pressure is achieved by placing additional weights in the geometric center of the rigid plate, so that the combined weight of the rigid plate and the additional weights results in a pressure of 18.0 kPa over the total area of the rigid plate. 6. After 30 seconds, the additional weights and the rigid plate are removed. 7. Immediately after, the cumulative length of the channel portions that remained intact is measured (in millimeters, if the channel is not straight, the curvilinear length across the middle of the channel is measured). If no portion of the channel has remained intact, then the channel is not permanent. 8. The percentage of integrity of the permanent channel is calculated by dividing the cumulative length of the channel portions, which remained intact along the length of the channel in the dry state, and then multiplying the quotient by 100.
[00056] Advantageously, a permanent channel, according to the invention, has an integrity percentage of at least 20%, or 30%, or 40%, or 50%, or 60, or 70%, or 80%, or 90%, following this test.
[00057] When the absorbent structure comprises particles of absorbent polymer and cellulose, it may be preferable that said channels, that is, longitudinal main channels and / or secondary channels, are also free of such cellulose.
[00058] In the following, when applicable, the description applies to each channel taken independently. For example, by "two longitudinal channels can extend over a distance L which is at least 15% '', it is understood that each of the two longitudinal channels can extend over a distance L which is at least 15 % ... ", that is, the channels can be the same or different. Longitudinal main channels
[00059] The two longitudinal main channels 26 are distributed in the absorbent layer 17 so that each longitudinal portion 20 of the absorbent layer comprises a longitudinal main channel 26.
[00060] As shown in Figure 2, the two main longitudinal channels are present at least in the region between the thighs of the absorbent layer. By "present at least in the region between the thighs", it is understood that the channels can be present only in the region between the thighs, or can extend from the region between the thighs to the anterior region and / or to the posterior region, that is that is, they can extend beyond the region between the thighs. In some embodiments, the two longitudinal main channels can extend over at least 15%, or at least 20%, or at least 30%, and up to 50%, or up to 70%, or up to 90% of the longitudinal dimension of the absorbent layer (that is, they can extend over a distance L that is at least 15% and up to 50%, or up to 70%, or up to 90% of the length M of the absorbent layer). In some embodiments, the two main longitudinal grooves may be present only in the region between the thighs. When present only in the region between the thighs, the main longitudinal channels can extend along the entire longitudinal dimension of the region between the thighs, that is, 50% of the longitudinal dimension M of the absorbent layer, or they can extend along only part of the region between the thighs, that is, at least 15%, or at least 20% or at least 30% up to 40%, or up to 45%, or even less than 50% of the longitudinal dimension of the absorbent layer. In some modalities, the two main longitudinal channels 26 may be present in the region between the thighs, or part of it, and part of the anterior region and / or part of the posterior region (as shown in Figure 2). In some modalities, the main longitudinal channels can be present in the anterior regions and between the thighs, that is, the channels extend through the region between the thighs (or part of it) and part of the anterior region. In these modalities, the main longitudinal channels can extend up to 70% of the longitudinal dimension of the absorbent layer, typically 15%, or 30%, or 35%, or from 40% to 70% of the longitudinal dimension of the absorbent layer (ie that is, they can extend over a distance L that is up to 70% of the length M of the absorbent layer). In some modalities, the main longitudinal channels can be present in the posterior regions and between the thighs, that is, the channels extend through the region between the thighs (or part of it) and part of the posterior region. In these modalities, the main longitudinal channels can extend up to 70% of the longitudinal dimension of the absorbent layer, typically 15%, or 30%, or 35%, or from 40% to 70% of the longitudinal dimension of the absorbent layer ( that is, they can extend over a distance L which is up to 70% of the length M of the absorbent layer). In some modalities, the main longitudinal channels can be present in the anterior regions, between the thighs and posterior. In these modalities, the main longitudinal channels can extend up to 90% of the longitudinal dimension M of the absorbent layer, typically from 55%, or from 60% to 70%, or up to 80% of the longitudinal dimension of the absorbent layer (that is, the same may extend over a distance L that is up to 90% of the length M of the absorbent layer).
[00061] The longitudinal main channels 26 can be mirror images of each other, in relation to the central longitudinal geometric axis x of the absorbent layer 17, that is, the longitudinal main channel in a longitudinal region 20 can be the mirror image of the longitudinal main channel. in the other longitudinal region of the absorbent layer 17.
[00062] The longitudinal main channels 26 do not extend to the transverse edges 19 of the absorbent layer 17, that is, from one transverse edge to the other. Typically, the absorbent layer comprises, along each transverse edge and immediately adjacent to said edge, a channel-free strip that extends in the transverse dimension of the absorbent layer, from one longitudinal edge to the other. Said strips have, respectively, a width F 'or G' which is at least 5% of the longitudinal dimension of the absorbent layer (i.e., a width which is at least 5% of the length of the absorbent layer). In other words, the shortest distance F 'or G' between the edge of a channel and the transverse edge of the absorbent layer is at least 5% of the longitudinal dimension M of the absorbent layer. In some embodiments, the width F 'or G' is at least 5% to 15%, or up to 10% of the longitudinal dimension of the absorbent layer.
[00063] Furthermore, in order to reduce the risk of fluid leaks and flow, the longitudinal main channels do not extend to the longitudinal edges 18 of the absorbent layer 17. Typically, the absorbent layer comprises, along each longitudinal edge and immediately adjacent to said edge, a strip free of channels that extends in the longitudinal dimension of the absorbent layer from one transverse edge to the other. Said strips are respectively 1 'or F' wide, which is at least 5%, or at least 10%, or at least 12% to 25% of the transverse dimension N of the absorbent layer in a given region (i.e., a width I 'or F' which is at least 5% of the width N of the absorbent layer). In other words, the minimum distance I 'or F' between the edge of a channel and the longitudinal edge of the absorbent layer is at least 5% to 25% of the transversal dimension of the absorbent layer. For example, the distance I 'or F' in the region between the thighs can correspond to at least 5%, or up to at least 10%, or at least 12% of the transverse dimension N of the absorbent layer in said region between the thighs. In some embodiments, the distance I 'and / or F' is 10 mm, or 15 mm, or 20 mm.
[00064] The longitudinal main channels can be straight channels that extend parallel to the longitudinal geometric axis of the absorbent layer (as shown schematically in Figure 4A). Straight channels act as fold lines in the absorbent structure, which contribute to providing a desirable bucket shape to the diaper, once worn. The diaper, once worn, conforms to the user's inner thigh. As a result, a U-shape is achieved, which minimizes leaks and increases comfort. These channels also optimize the transport of fluids within the absorbent structure and, therefore, contribute to rapid capture of emissions.
[00065] Alternatively, the longitudinal main channels can be curved, as shown in Figure 4B. Curved channels act as fold lines in the absorbent structure, which assist the absorbent structure to follow the diaper user's morphology, that is, the channels constrict the product to take a U shape when the diaper is worn and compacted by the user's thighs . In this way, the channels provide a comfortable and superior adaptation, in addition to allowing improved liquid transport.
[00066] The longitudinal main channels 26 can be oblique channels, as shown in Figure 4C, that is, straight channels oriented at an angle θ of up to 30 degrees, or up to 20 degrees, or up to 10 degrees in relation to the geometric axis central longitudinal of the absorbent structure.
[00067] In other alternatives, the longitudinal main channels can be angled channels, as shown in Figure 4D. Angled channels are channels produced from two or more portions connected to each other at an angle s. Typically, angled channels are produced from two connected portions at an angle s of at least 150 degrees, or at least 160 degrees, or at least 170 degrees.
[00068] In some embodiments, the longitudinal main channels can be called "branched" channels, that is, channels that have at least one end that does not end on a straight, angular or curved transverse edge 28, but on a branch 29. Branch 29 can form an angle up to 30 degrees, or up to 20 degrees, or up to 10 degrees with respect to the central longitudinal axis of the channel.
[00069] The longitudinal main channels 26 can have an average width w of 3 mm to 15 mm, or from 4 mm to 14 mm, or from 5 mm to 12 mm (the average width of a channel is the average distance between its edges longitudinal sides 27). The average width of the longitudinal main channels can be at least 4% of the width of the absorbent layer, or at least 7%, and up to 15%, or 20%, or 25%. In some embodiments, the longitudinal main channels can have an average width w of 3 mm to 18 mm, or from 5 mm to 15 mm, or from 6 to 10 mm. Branches 29 also have an average width w of at least 3 mm or at least 4% of the width of the absorbent layer, or at least 7% and up to 15%, or up to 20%, or up to 25% (a average distance between the longitudinal edges 27 'of the branches 29).
[00070] Preferably, the longitudinal main channels 26 are separated in the region between the thighs by a distance D (shown in Figure 2) of at least 5%, or at least 10%, or at least 20%, or at least 25 % of the transverse dimension (width) of the absorbent layer in said region between the thighs. It was found that when these two longitudinal main channels are separated by a distance of at least 5% of the transversal dimension of the absorbent layer in the region between the thighs, the disposable diaper presents a desired bucket shape that improves the adaptation of the diaper. In some embodiments, the main longitudinal grooves can be separated in the region between the thighs by a distance of at least 10 mm, or at least 15 mm, or at least 20 mm, or at least 30 mm. In some modalities, the distance that separates the main longitudinal channels in the region between the thighs is 20 to 30 mm.
[00071] The inventors have found that when an absorbent structure is provided with at least two channels, as described above, that is, two longitudinal main channels, the flexibility of the absorbent structure is increased, specifically for an absorbent structure that exclusively comprises polymer particles absorbent in the absorbent layer. The two channels create flexion lines that guide the diaper's flexion to adapt to the user's anatomy and, therefore, optimize the adaptation of the diaper.
[00072] Furthermore, the inventors have observed that an absorbent structure that has at least two channels, as described above, presents better fluid transport versus an absorbent structure of the same type that does not comprise channels. In fact, it was observed that the channels provide rapid capture of emissions, which reduces the risk of leaks. The channels prevent saturation of the absorbent layer in the fluid discharge region, which increases the risk of leaks. Secondary channels
[00073] The absorbent layer may comprise additional channels 26 'to further increase fluid transport and / or the adaptation of the absorbent article, here called secondary channels. The above description of the longitudinal main channels can also be applied to any of said secondary channels 26 '. However, in some modes, the secondary channels can be shorter than the longitudinal main channels.
[00074] The secondary channels can extend in the longitudinal dimension of the absorbent layer (secondary longitudinal channels) and / or in the transverse dimension of the absorbent layer (secondary secondary channels), as long as they do not extend to the longitudinal edges and / or edges transversal layers of the absorbent layer. In this way, the absorbent layer is free of channels, that is, main longitudinal channels and secondary channels, extending to its longitudinal edges and its transverse edges.
[00075] The secondary longitudinal channels can extend over a distance V 'of at least 10%, or at least 15%, or at least 20% of the longitudinal dimension M of the absorbent layer (as shown in Figure 6). They can extend up to 90% of the longitudinal dimension of the absorbent layer. Typically, the longitudinal secondary channels extend up to 30% or 45% of the longitudinal dimension of the absorbent layer.
[00076] The transverse secondary channels can extend over a distance of at least 10%, or at least 15%, or at least 20%, of the transversal dimension (width) N of the absorbent layer. They can extend up to 90% of the transversal dimension of the absorbent layer. Typically, the transverse secondary channels extend up to 30% or 45% of the transverse dimension of the absorbent layer. In some embodiments, the absorbent layer does not comprise transverse channels.
[00077] Typically, the secondary channels are distributed so that, along each transverse edge of the absorbent layer and immediately adjacent to said edge, the strip extending in the transverse dimension of the absorbent layer from one longitudinal edge to the other along of a distance F 'or G' remains free of channels (as shown above in relation to the distribution of the main longitudinal channels).
[00078] Typically, the secondary channels are distributed so that, along each longitudinal edge and immediately adjacent to said edge, the strip extending in the longitudinal dimension of the absorbent layer from one transverse edge to the other over a distance H 'or I' remains free of channels (as shown above in relation to the longitudinal distribution). main channels
[00079] The longitudinal main channels and, when present, the secondary channels, can be distributed in the absorbent layer so that a strip extending along the central longitudinal axis of the absorbent layer (and including said geometric axis) of a transverse edge to the other, which has a width D 'of at least 5%, or at least 10% and up to 60%, or up to 70%, or up to 75% of the transverse dimension of the absorbent layer, remains free of channels. Particles of absorbent polymer are preferably continuously present on said strip. For example, said strip can have a width D 'of at least 5 mm, or at least 10 mm, or at least 15 mm or 20 mm and up to 70 mm or up to 40 mm. The absence of channels in said strip is advantageous, since it prevents the diaper from taking an inverted V shape, once worn. An inverted V-shape configuration increases the risk of fluid leakage. In some embodiments, the average base weight of the absorbent polymer particles in said strip is high, that is, at least 350 gsm and up to 1,000 gsm, or, for example, from 450 gsm to 750 gsm.
[00080] Although the secondary channels may be transverse secondary channels, the absorbent layer does not comprise such channels in the region between the thighs. Gutters extending in the transverse dimension in the region between the thighs would transport liquids to the transverse edges and would undesirably increase the risk of fluid leakage and / or runoff. However, such secondary channels can be present in the anterior and / or posterior region of the absorbent layer.
[00081] Secondary longitudinal channels can be present in the anterior region, posterior region and / or region between the thighs of the absorbent layer.
[00082] As shown in relation to the longitudinal main channels, the secondary channels can be straight channels parallel to the central longitudinal geometric axis of the absorbent structure (as shown in Figure 4A), curved channels (as shown in Figure 4B), angled channels (as shown in Figure 4B) shown in Figure 4D), oblique channels (as shown in Figure 4C) or branched channels (as shown in Figure 4E). The longitudinal oblique channels, when present in the anterior or posterior region of the absorbent layer (that is, none in the region between the thighs), can form an angle θ of up to 60 degrees, or up to 50 degrees, or up to 45 degrees, with the central longitudinal geometric axis of the absorbent layer.
[00083] The secondary channels can have an average width w 'of 3 mm to 15 mm, or from 4 mm to 14 mm, or from 5 mm to 12 mm (the average width of a channel being the average distance between its lateral edges longitudinal 27) or the average width of the secondary channels can be at least 4% of the width of the absorbent layer, or at least 7% and up to 15%, or 20% or 25%. In some embodiments, the secondary channels can have an average width w 'of 3 mm to 18 mm, or from 5 mm to 15 mm, or from 6 to 10 mm. Branches 29 also have an average width w 'of at least 3 mm or at least 4% of the width of the absorbent layer, or at least 7% and up to 15%, or up to 20%, or up to 25% ( the average distance between the longitudinal edges 27 'of the branches 29).
[00084] The main longitudinal channels and the secondary channels can be spaced apart from each other by a distance of at least 5 mm, or at least 8 mm.
[00085] The absorbent layer may comprise one or more of said secondary channels, such as 2, 3, 4, 5 or 6. Preferably, the absorbent layer comprises an even number of secondary channels. The secondary channels can be distributed in the absorbent layer so that each longitudinal region of the absorbent layer comprises an equal number of secondary channels. In some embodiments, the longitudinal regions that comprise the channels (ie, longitudinal main channels and secondary channels) are images of each other in relation to the central longitudinal geometric axis of the absorbent layer.
[00086] In some embodiments, as illustrated in Figures 3A to 3C, the longitudinal secondary channels and the longitudinal main channels are not distinguishable, that is, the longitudinal secondary channels and the longitudinal main channels are similar. The resulting absorbent layer can therefore be seen to comprise more than two longitudinal main channels 26 which are at least present in the region between the thighs (for example, 4 longitudinal main channels). In some embodiments, it may be preferable that the maximum number of channels in the region between the thighs is such that the sum of the widths w of the channels 26 is less than 50% of the transverse dimension (width) of the absorbent layer in the region between the thighs.
[00087] In some embodiments, as shown in Figure 5, the absorbent layer 17 may comprise two longitudinal main channels 26, as described above, and two longitudinal secondary channels in the anterior region 26 '. The two longitudinal main channels 26 are at least present in the region between the thighs. By at least present in the region between the thighs, it is understood that said two main longitudinal channels can extend to the anterior region and / or to the posterior region. The two main longitudinal grooves 26 at least present in the region between the thighs can extend over a distance L which is at least 15% of the longitudinal dimension M of the absorbent layer. The secondary longitudinal channels 26 'in the anterior region can extend over a distance V' which is at least 10% to 20% of the longitudinal dimension M of the absorbent layer. The two longitudinal main channels 26 in the region between the thighs can be curved channels, while the two longitudinal secondary channels 26 'in the anterior region can be oblique channels. Preferably, the channels in one of the longitudinal regions are images of each other in the other longitudinal region.
[00088] In some other embodiments, as shown in Figure 6, the absorbent layer 17 may comprise two longitudinal main channels 26 in the region between the thighs, two longitudinal secondary channels 26 'in the anterior region and two longitudinal secondary channels 26' in the posterior region . The longitudinal main channels 26 in the region between the thighs 25 can extend over at least 15% of the longitudinal dimension of the absorbent layer. The secondary longitudinal channels 26 'in the anterior and posterior regions can extend over a distance V' which is at least 10% to 20% of the longitudinal dimension M of the absorbent layer. The longitudinal main channels 26 in the region between the thighs can be curved channels, while the longitudinal secondary channels 26 'in the anterior and posterior regions can be oblique channels. Preferably, the channels in one of the longitudinal regions are images of each other in the other longitudinal region.
[00089] When secondary channels 26 'are longitudinal secondary channels extending in the region between the thighs, it may be preferable that the maximum number of channels in the absorbent layer be such that the sum of the wew' widths of the channels (secondary channels and channels main longitudinal) is less than 50% of the transversal dimension of the absorbent layer in the region between the thighs.
[00090] In some embodiment of the present invention, it may be preferable that the region 30 of the absorbent layer immediately adjacent to the channels 26 and 26 'and which extends over a distance k of at least 3 mm, or at least 5 mm , or at least 7 mm from the edges of the channels, comprises particles of absorbent polymer present substantially continuously. Preferably, in these regions 30, the average base weight of particles of absorbent polymer is high, that is, at least 350 gsm, or at least 400 gsm, or at least 500 gsm or at least 600 gsm. Absorbent layer
[00091] As explained above, channels 26 and 26 'are regions free of particles of absorbent polymer that extend through the thickness of the absorbent layer. The absorbent layer comprises particles of absorbent polymer 50 alone or in combination with other materials such as cellulose. Preferably, the absorbent layer comprises only particles of absorbent polymer. Particles of absorbent polymer are immobilized on the substrate layer, typically by a thermoplastic adhesive material 40.
[00092] Typically, the absorbent polymer particles suitable for use in the absorbent layer can comprise any absorbent polymer particles known in the superabsorbent literature, for example, as described in Modern Superabsorbent Polymer Technology, by F.L. Buchholz, A.T. Graham, Wiley 1998.
[00093] The absorbent polymer particles can be spherical, ball-like or irregularly shaped particles, such as Vienna sausage-shaped particles, or ellipsoid-shaped particles, of the type typically obtained from reverse phase suspension polymerizations. The particles can also optionally be agglomerated, at least to a certain extent, to form larger irregular particles.
[00094] Particles of absorbent polymer can be selected from materials based on polyacrylates and polyacrylates, which are internally and / or superficially cross-linked, such as, for example, cross-linked and partially neutralized acid polyacrylates or polyacrylate. Examples of absorbent polymer particles suitable for the present invention are described, for example, in PCT patent applications WO 07/047598, WO 07/046052, W02009 / 155265 and W02009 / 155264.
[00095] The absorbent polymer particles are preferably internally crosslinked, that is, the polymerization is carried out in the presence of compounds that have two or more polymerizable groups that can be copolymerized to free radical in the polymer network. Useful crosslinkers include, for example, ethylene glycol dimethacrylate, diethylene glycol diacrylate, allyl methacrylate, trimethylol propane triacrylate, trialyl amine, tetraalkyl oxyethane, as described in EP-A 530 438, di- and triacrylates, as described in EP-A 547 847, EP-A 559 476, EP-A 632 068, WO 93/21237, WO 03/104299, WO 03/104300, WO 03/104301 and DE-A 103 31 450, mixed acrylates which , as well as acrylate groups, include additionally ethylenically unsaturated groups, as described in documents DE-A 103 31 456 and DE-A 103 55 401, or crosslinker mixtures, as described, for example, in documents DE-A 195 43 368, DE -A 196 46 484, WO 90/15830 and WO 02/32962, as well as the crosslinkers described in WO2009 / 155265.
[00096] Particles of absorbent polymer can be cross-linked externally (post-cross-linked). Useful post-crosslinkers include compounds that include two or more groups capable of forming covalent bonds with the carboxylate groups of the polymers. Useful compounds include, for example, alkoxysilyl compounds, polyaziridines, polyamines, polyamido amines, di- or polyglycidyl compounds, as described in EP-A 083 022, EP-A 543 303 and EP-A 937 736, polyhydric alcohols , as described in document DE-C 33 14 019, cyclic carbonates, as described in document DE-A 40 20 780, 2-oxazolidone and its derivatives, such as N- (2-hydroxy ethyl) -2-oxazolidone, as described in DE-A 198 07 502, bis- and poly-2-oxazolidones, as described in DE-A 198 07 992, 2-oxotetrahydro-1,3-oxazine and its derivatives, as described in DE-A 198 54 573, N-acyl-2-oxazolidones, as described in DE-A 198 54 574, cyclic ureas, as described in DE-A 102 04 937, bicyclic acetal amides, as described in DE- A 103 34 584, oxetane and cyclic ureas, as described in EP-A 1 199 327, and morpholine-2,3-dione and its derivatives, as described in WO 03/031482.
[00097] Particles of absorbent polymer may have surface modifications, such as being coated or partially coated by a coating agent. Examples of coated absorbent polymer particles are presented in WO2009 / 155265. The coating agent can be such that it makes the absorbent polymer particles more hydrophilic. The coating agent can be a polymer, such as an elastic polymer or a film-forming polymer, or an elastic film-forming polymer, which forms an elastomeric (elastic) film coating on the particle. The coating can be a homogeneous and / or uniform coating on the surface of the absorbent polymer particles. The coating agent can be applied at a level of 0.1% to 5%, or 0.2% to 1%, by weight, of the surface modifying absorbent polymer particles.
[00098] Typically, the absorbent polymer particles can have a selected particle size distribution. For example, the absorbent polymer particles can have a particle size distribution in the range of 45 pm to 4,000 pm, more specifically from 45 pm to about 1,000 pm, or from about 100 pm to about 850 pm, or about 100 pm to about 600 pm. The particle size distribution of a material in the form of particulates can be determined as is known in the art, for example, through dry sieve analysis (EDANA 420.02 "Particle Size distribution"). Optical methods can also be used, for example, based on light scattering and image analysis techniques.
[00099] The absorbent layer of the absorbent structure may comprise particles of absorbent polymer and, optionally, cellulose, distributed over the substrate layer in such a way that they form a continuous layer, i.e., an uninterrupted layer of absorbent polymer particles and cellulose. , when present, which, however, comprises regions substantially free of particles of absorbent polymer. These distinct regions substantially free of absorbent particles correspond to the channels of the absorbent structure. In some embodiments, the absorbent layer is cellulose-free. Alternatively, the absorbent layer may comprise particles of absorbent polymer and, optionally, cellulose, distributed over the substrate layer in such a way that they form a discontinuous layer. In some embodiments, the absorbent layer is cellulose-free. In these embodiments, the absorbent polymer particle and cellulose, when present, can be deposited on the substrate layer in clusters of particles (and cellulose, when present), thus forming a discontinuous layer or an interrupted layer of absorbent polymer particles. (and cellulose, when present) which nevertheless comprises regions substantially free of clusters of absorbent polymer particles. These distinct regions substantially free of clusters of absorbent particles correspond to the channels of the absorbent structure. The groupings of absorbent polymer particles (and cellulose, when present) can have a variety of shapes, including, but not limited to, circular, oval, square, rectangular, triangular and the like. Suitable methods for depositing particles in a cluster are presented in EP 1621167 A2, EP 1913914 A2 and EP 2238953 A2. Typically, particles of absorbent polymer are deposited on the substrate layer in clusters of particles when two such absorbent structures are combined to form an absorbent core. The two absorbent structures are combined so that the resulting absorbent core comprises particles of absorbent polymer distributed substantially continuously between the two substrate layers, except in regions where the channels are present. "Distributed substantially continuously", for use in the present invention, indicates that the first layer of substrate and the second layer of substrate are separated by a multiplicity of particles of absorbent polymer. It is recognized that there may be minor incidental contact areas between the first substrate layer and the second substrate layer within the area of absorbent particulate polymeric material (i.e., the area between the two substrate layers). The areas of incidental contact between the first substrate and the second substrate may be intentional or unintentional (for example, artifact manufacture), but they do not form geometries such as cushions, bags, tubes, quilted patterns and the like.
[000100] The absorbent polymer particles are immobilized on the substrate layer. Immobilization can be achieved by applying a thermoplastic adhesive material that holds and immobilizes the absorbent polymer particles, and cellulose, when present, on the substrate layer. Some thermoplastic adhesive material can also penetrate the layer of absorbent polymer particles and into the substrate layer to provide additional immobilization and fixation. The thermoplastic adhesive material not only helps in immobilizing the particles of absorbent polymer on the substrate layer, but also helps to maintain the integrity of the channels. The thermoplastic adhesive material prevents a significant amount of particles of absorbent polymer from migrating into the channels.
[000101] The integrity / immobilization of the channels can also be achieved by allowing the layer of substrate that supports the particles of absorbent polymer to bend into the channels, that is, to be corrugated into the channels. Alternatively, integrity / immobilization can be achieved by allowing an additional substrate layer, such as the core cover, when present, to fold into the channels, that is, to be waved into the channels. When two absorbent structures, as shown above, are combined, integrity / immobilization can be achieved by allowing the substrate layer of one of the absorbent structures to fold into the channels. In some embodiments, an adhesive (for example, a thermoplastic adhesive material) can be applied to these portions of the substrate layer, which is corrugated into the channels to provide additional fixation.
[000102] The thermoplastic adhesive material can be applied as a continuous layer (that is, uniformly) on the absorbent layer. In some embodiments, the thermoplastic adhesive material comes into contact with particles of absorbent polymer (and cellulose, when present) and part of the substrate layer when particles of absorbent polymer (and cellulose, when present) are deposited in clusters.
[000103] In some embodiments, the thermoplastic adhesive material can be applied as a fibrous layer that forms a fibrous network over the absorbent layer. The fibrous layer of thermoplastic adhesive can be at least partially in contact with the absorbent polymer particles (and cellulose, when present) and partially in contact with the substrate layer of the absorbent structure, when the absorbent polymer particles (and cellulose, when present) are deposited in groupings. Thus, the thermoplastic adhesive material can provide cavities to cover the particles of absorbent polymer, and thus immobilize that material and the channels, when present.
[000104] Thermoplastic adhesive materials suitable for immobilizing the absorbent polymer particles typically combine behavior of good cohesion and good adhesion. Good adhesion promotes good contact between the thermoplastic adhesive material and the absorbent polymer particles, and the substrate layer. Good cohesion reduces the likelihood of adhesive breaks, in particular in response to external forces, and particularly in response to stresses. When the absorbent structure / core absorbs liquids, the particles of absorbent polymer swell and subject the thermoplastic adhesive material to external forces. The thermoplastic adhesive material can allow such expansion, without breaking and without exerting excessive compression forces that could restrict the expansion of the absorbent polymer particles.
[000105] Thermoplastic adhesive materials suitable for use in the present invention include thermofused adhesives that comprise at least one thermoplastic polymer in combination with a plasticizer and other thermoplastic diluents such as taching resins and additives such as antioxidants. Suitable exemplifying thermofused adhesive materials are described in EP 1447067 A2. In some embodiments, the thermoplastic polymer has a molecular weight (MW) greater than 10,000, and a glass transition temperature (tg) below room temperature or -6 ° C> Tg <16 ° C. In certain embodiments, the polymer concentrations in a thermofused are in the range of about 20 to about 40% by weight. In certain embodiments, thermoplastic polymers can be insensitive to water. Some examples of polymers are block (styrenic) copolymers, including ABA triblock structures, AB diblock structures and radial block copolymer (AB) n structures, in which blocks A are non-elastomeric polymer blocks typically containing polystyrene, and blocks B are unsaturated conjugated diene, or (partially) hydrogenated versions of these. Block B is typically isoprene, butadiene, ethylene / butylene (hydrogenated butadiene), ethylene / propylene (hydrogenated isoprene), and mixtures of these items.
[000106] Other suitable thermoplastic polymers that can be used are metallocene polyolefins, which are ethylene polymers prepared using single-site or metallocene catalysts. In this case, at least one comonomer can be polymerized with ethylene to produce a copolymer, terpolymer or other higher order polymer. Also applicable are amorphous or poly amorphous polyolefins (APAO), which are homopolymers, copolymers or terpolymers of alpha-olefins from C2 to C8.
[000107] The thermoplastic adhesive material, typically a hot-melt adhesive material, is generally present in the form of fibers, that is, the hot-melt adhesive can be converted into fibers. In some embodiments, the thermoplastic adhesive material forms a fibrous network over the particles of absorbent polymer. Typically, the fibers can have an average thickness of about 1 pm to about 100 pm, or about 25 pm to about 75 pm, and an average length of about 5 mm to about 50 cm. In particular, the layer of hot-melt adhesive material can be provided to comprise a mesh-like structure. In certain embodiments, the thermoplastic adhesive material is applied in an amount of 0.5 to 30 g / m2, or from 1 to 15 g / m2, or from 1 to 10 g / m2 or even from 1.5 to 5 g / m2 m2 per layer of substrate.
[000108] A typical parameter for a hot-melt adhesive suitable for use in the present invention can be a tangent delta of the loss angle at 60 ° C below the value of 1, or below the value of 0.5. The delta tangent of the loss angle at 60 ° C is correlated to the liquid character of an adhesive under high ambient temperatures. The lower the Delta tangent, the more the adhesive behaves as a solid rather than a liquid, that is, the lower its tendency to flow or migrate, and the lower the tendency for an adhesive superstructure, as described in the present invention, deteriorating or even falling apart over time. This value is therefore particularly important if the absorbent article is to be used in a hot climate.
[000109] It may be beneficial, for example, for processing and / or performance reasons, that the thermoplastic adhesive material has a viscosity between 800 and 4,000 mPa.s, or 1,000 mPa.s, or 1,200 mPa.s , or 1,600 mPa.s to 3,200 mPa.s, or 3,000 mPa.s, or 2,800 mPa.s, or 2,500 mPa.s, at 175 ° C, as measured by the ASTM D3236-88 method, using of a spindle 27, 20 pmp, preheating for 20 minutes at temperature, and stirring for 10 min.
[000110] The thermoplastic adhesive material can have a softening point between 60 ° C and 150 ° C, or between 75 ° C and 135 ° C, or between 90 ° C and 130 ° C, or between 100 ° C and 115 ° C, as can be determined by the ASTM E28-99 method (Herzog method, using glycerin).
[000111] In one embodiment of the present invention, the thermoplastic adhesive component can be hydrophilic, having a contact angle less than 90 °, or less than 80 °, or less than 75 °, or less than 70 °, as measurable by the method ASTM D 5725-99.
[000112] In some embodiments, the absorbent structure may also comprise an adhesive material deposited on the substrate before the application of the absorbent polymer particles on the substrate layer, called here the auxiliary adhesive. The auxiliary adhesive can improve the immobilization of the absorbent polymer particles on the substrate layer, the same can be a thermoplastic adhesive material, and comprise the same thermoplastic adhesive material described earlier in this document, or the same can be different. An example of a commercially available adhesive is product No. HL-1620-B, by H.B. Fuller Co. (St. Paul, MN, USA). The thermoplastic adhesive material can be applied to the substrate layer by any suitable means.
[000113] In some embodiments, the absorbent polymer particles and, optionally, cellulose, can be uniformly distributed in the longitudinal and / or transverse dimensions of the absorbent layers, without considering that the absorbent layer is a continuous layer or a discontinuous layer of particles of absorbent polymer and, optionally, cellulose, as described above, to provide an absorbent core that has a uniform distribution of particles of absorbent polymer. The average base weight of the absorbent polymer particles will depend on the specific diaper to which they can be incorporated. In some embodiments, the average base weight of the absorbent polymer particles in the absorbent core can be 350 gsm to 1,500 gsm. The amount of absorbent polymeric particles in the respective region is calculated by determining the weight of the absorbent polymeric material in this region and dividing it by the total surface area of the region (consequently, the average amount is taken).
[000114] In some embodiments, the absorbent polymer particles and, optionally, cellulose, can be uniformly distributed in the longitudinal and / or transverse dimension of at least one of the absorbent layers, to provide a profiled absorbent core. For example, the region between the thighs of the absorbent structure / core may comprise a greater amount of absorbent polymer particles per area, compared to the anterior and posterior regions of the absorbent structure / core. In some embodiment, the front half of the absorbent core comprises most of the absorbent capacity, that is, it can comprise more than about 60% of the absorbent polymer particles, or more than about 65%, or more than 70% , based on the total weight of absorbent polymer particles in the absorbent core.
[000115] In some embodiments, the absorbent structure, as shown above, can form the absorbent core of the disposable diaper, or it can be a component thereof (i.e., the absorbent core can be a laminate of absorbent structures).
[000116] The absorbent core may additionally comprise a cover layer, typically disposed in the thermoplastic adhesive material. The cover layer can be a separate layer, or it can be unitary with the substrate layer. In this case, the substrate layer that supports the absorbent polymer particles is folded to form a top and bottom layer that contains the absorbent polymer particles. The cover layer can be made from the same material as the substrate layer, or it can be made from a different material. The layers can be bonded together around their periphery to enclose the particles of absorbent polymer therein, for example, by adhesive bonding and / or hot bonding. In some embodiments, the core cover can be corrugated into channels.
[000117] In some embodiments, the absorbent core may comprise a capture system that is arranged between the upper layer and the user facing side of the absorbent structure. The capture system can serve as a temporary reservoir for liquids, until the absorbent structure can absorb the liquid. The capture system can comprise a single layer or multiple layers, such as an upper capture layer facing the user's skin and a lower capture layer facing the user's garment. The capture system can be in direct contact with the absorbent structure. In these modalities, the capture system can fill the channels, or part of them. In some embodiments, the capture system can be placed over the core cover, when present. In modalities where the core cover or the substrate layer folds into the channels, that is, it ripples into the channels, the capture system can fill the channels, or part of them. In some embodiments, the capture system, or a layer thereof, can be connected to the core cover or substrate layer, which undulates into the channels, thus providing a wave profile to said capture system.
[000118] In a certain embodiment, the capture system may comprise chemically cross-linked cellulosic fibers. Such cross-linked cellulosic fibers may have desirable absorbency properties. Exemplary chemically cross-linked cellulosic fibers are disclosed in US Patent No. 5,137,537. In certain embodiments, chemically cross-linked cellulosic fibers are cross-linked with a percentage between about 0.5 mol% and about 10.0 mol% of a C2 to C9 polycarboxylic crosslinking agent or between about 1.5 mol% and about 6.0 mol% of a C2 to C9 polycarboxylic crosslinking agent based on glucose unit. Citric acid is an exemplifying cross-linking agent. In other embodiments, polyacrylic acids can be used. In addition, according to certain embodiments, the cross-linked cellulosic fibers have a water retention value of about 25 to about 60, or about 28 to about 50, or about 30 to about 45. One method for determining the water retention value is disclosed in US Patent No. 5,137,537. According to certain modalities, the crosslinked cellulosic fibers can be crimped, twisted or curly, or a combination of these modes, including crimped, twisted and curly.
[000119] In one embodiment, one or both of the upper and lower capture layers may comprise a nonwoven, which may be hydrophilic. In addition, according to a certain embodiment, one or both of the upper and lower capture layers may comprise chemically cross-linked cellulosic fibers, which may or may not be part of a non-woven material. Furthermore, according to a certain embodiment, the upper capture layer may comprise a nonwoven, without chemically cross-linked cellulosic fibers, and the lower capture layer may comprise chemically cross-linked cellulosic fibers. In addition, according to one embodiment, the lower capture layer may comprise chemically cross-linked cellulosic fibers mixed with other fibers such as natural or synthetic polymeric fibers. According to exemplifying modalities, these other natural or synthetic polymeric fibers may include fibers with a high surface area, thermoplastic binding fibers, polyethylene fibers, polypropylene fibers, PET fibers, rayon fibers, lyocell fibers, and mixtures thereof. Non-woven materials suitable for the upper and lower capture layers include, but are not limited to, SMS material, which comprises a continuous spinning layer, a layer produced by block extrusion with high-speed hot air (meltblown) and an additional layer of continuous wiring. In certain embodiments, non-woven permanently hydrophilic, and in particular, non-woven with permanently hydrophilic coatings are desirable. Another suitable embodiment comprises an SMMS structure. In certain embodiments, nonwovens are porous.
[000120] In some embodiments, as shown in Figures 7 to 10, the absorbent core of the disposable diaper may comprise two or more absorbent structures, as shown here, that is, absorbent structures comprising channels, which are combined or overlapped. Typically, the absorbent structures can be combined so that the thermoplastic adhesive material of the first absorbent structure comes in direct contact with the thermoplastic adhesive material of the second absorbent structure.
[000121] Figures 7, 8, 9 and 10 illustrate modalities where a first absorbent structure 15 comprising an absorbent layer 17 with channels 26 is combined with a second absorbent structure 15 'comprising an absorbent layer 17' with channels 26 '. In the embodiments shown, the thermoplastic adhesive material 40 of the first absorbent structure comes in direct contact with the thermoplastic adhesive material 40 'of the second absorbent structure. An auxiliary adhesive 60 may be present on the substrate layer of the first and / or second absorbent structures for further immobilization of the absorbent polymer particles (as shown in Figure 7). In some embodiments, the substrate layer 16 'of the second absorbent structure 15' can wave into channels 26 'of the second absorbent structure (as shown in Figures 8 and 10) and even into channels 26 of the first absorbent structure 15, where it can possibly be adhered to the substrate layer 16 of the first absorbent structure (as shown in Figure 9). Typically, when the substrate layer of an absorbent structure ripples into the channels, the substrate layers of the two absorbent structures are not coextensive, that is, one of the substrate layers may be wider or longer, to penetrate the channels 26 and / or 26 '. The undulations of the substrate layer in the channels contribute to the integrity of the channels in dry and wet states.
[000122] In the modalities in which two or more absorbent structures comprise channels, it may be that the first and second absorbent structures are mirror images of each other. In these embodiments, the channels 26 of the first absorbent structure 15 substantially overlap the channels 26 'of the second adjacent absorbent structure 26', as shown in Figures 7, 8 and 9. The resulting absorbent core is a laminate of absorbent structures 17 and 17 ', with channels extending substantially through the thickness of the absorbent core (by substantially, for use in the present invention, it is understood that the thicknesses of the substrate layers are hereby omitted).
[000123] In modalities where the two or more absorbent structures comprise channels, the first and the second absorbent structures may be different. In some of these modalities, some of the channels of the two absorbent layers can be superimposed (as shown in Figure 10). In other embodiments, the channels of an absorbent structure do not overlap the channels of the adjacent absorbent structure, but complement the channels of the adjacent structure. By complementing, it is understood that the channels of the second absorbent structure form an extension of the channels of the first absorbent structure.
[000124] In some embodiments, as shown in Figures 11 to 13, the absorbent core of the disposable diaper may comprise one or more absorbent structures, as shown here, in combination with an absorbent structure comprising an absorbent layer that is free of channels . In these embodiments, the channel-free absorbent structure comprises a substrate layer and an absorbent layer, as shown, which is, however, channel-free. When only one of the absorbent structures comprises said channels, the absorbent structure with channels may, in some embodiments of the present invention, be closer to the user during use than the absorbent structure (s) without channels.
[000125] Figures 11, 12 and 13 illustrate modalities where a first absorbent structure 15 with channels 26 is combined with a second absorbent structure 15 'without channels. In the embodiment shown in Figure 11, the thermoplastic adhesive material 40 of the first absorbent structure 15 comes into direct contact with the thermoplastic adhesive material 40 'of the second absorbent structure 15', while in figures 12 and 13, the second absorbent structure 15 'does not. comprises any 40 'thermoplastic adhesive material (however, it may be present to immobilize the absorbent layer on the substrate layer). An auxiliary adhesive 60 may be present on the substrate layer of the first and / or second absorbent structure for further immobilization of the absorbent polymer particles 50 (as shown in Figure 11). In some embodiments, the substrate layer 16 of the first absorbent structure 15 can be corrugated into channels 26 of the first absorbent structure (as shown in Figures 12 and 13). The absorbent core may additionally comprise a capture system that penetrates and fills the channels (however, in some embodiments, the capture system does not fill the channels). Figure 13 shows a mode where the capture system comprises a first layer 12 and a second layer 13, where the second layer fills the channels. Method for producing the absorbent structure
[000126] The channel-absorbent structure of the present invention can be produced by any method comprising the step of depositing particles of absorbent polymer and, optionally, cellulose, to form an absorbent layer on a substrate layer, for example, by placing the first said substrate layer is placed on high portions in the shape and dimensions of said channels to be produced and then deposits said particles of absorbent polymer and, optionally, cellulose, in them, thus, the particles of absorbent polymer and, optionally, cellulose does not remain in said raised portions, but remains only in portions of the substrate layer.
[000127] The channel-free absorbent structure of the present invention can be produced by any method comprising the step of depositing particles of absorbent polymer and, optionally, cellulose, as an absorbent layer on a substrate layer.
[000128] In some embodiments, the absorbent structure with the substrate layer with two or more channels in it and with substantially no absorbent material is, for example, achievable by the method comprising the steps of: a) providing a feeder to feed the said absorbent material (particles of absorbent polymer and, optionally, cellulose) to a first infinite moving surface, such as a feeder, b) providing a transfer medium for transferring a layer of substrate to a second infinite moving surface, c) provide a first infinitely moving surface, which has one or more reservoirs forming an absorbent layer with a longitudinal dimension and an average length, a perpendicular transversal dimension and an average width, and, perpendicular to both, a depth dimension and an average depth , and a volume of empty space for receiving said absorbent material in it, said reservoir (s) ( s) comprising one or more embossed strips which extend substantially longitudinally, without having a volume of empty space, for example, each having an average width W of at least 4% or at least 5% of the average width of the reservoir , and an average length L of at least 5% and a maximum of 30% of the average longitudinal dimension of the reservoir, said reservoir (s) being used to transfer said absorbent material to said second infinite surface in adjacent and close to the same movement, d) to provide a second surface in movement, which has an external housing that has one or more air-permeable or partially air-permeable receptacles for receiving said substrate layer on the same or the same, with a reception area and one or more interlocking strips that extend substantially longitudinally, which can be impermeable to air, and each having an average width W 'of, for example, at least 2.5 mm, preferably 0.5 x W at 1.2 x W, an average length 1 / d, for example, about 0.8 x L at 1.2 x L, through which said external air-permeable housing is connected to one or more secondary vacuum to facilitate the retention of the substrate layer and / or said absorbent material therein, and through which, at a meeting point, said first infinite moving surface and said external housing are at least partially adjacent to each other another and are in close proximity to each other during the transfer of said absorbent material, and so that each insert strip is substantially completely adjacent to and is in close proximity to an embossed strip during the transfer of said absorbent material, e) feeding said absorbent material into said first infinite moving surface, at least in said reservoir (s) thereof, f) optionally removing any absorbent material from said strip (s) (s) in relief, g) simult to simultaneously transfer said layer of substrate to said second infinite surface in motion, into or over said receptacle (s), h) selectively transfer said meeting point, said absorbent material with said first infinite surface in motion only at said part of the support blade which is on or within said receiving area of said receptacle.
[000129] Said reservoir (s) can be formed by multiple grooves and / or cavities with a volume of empty space, for receiving said absorbent material in them. In some embodiments, the average width W of (each) strip is preferably at least 6 mm, or, for example, at least 7 mm, and / or at least 7%, or, for example, at least 10% of the average width of the respective reservoir.
[000130] Said grooves and / or cavities can each have, for example, a maximum dimension in the transverse direction that is at least 3 mm, and through which the shortest distance between cavities and / or grooves directly next to each other. substantially transversal dimension, is less than 5 mm. The cavities and / or grooves that are directly adjacent to an embossed strip can have a volume that is greater than the volume of one or more, or all of its close cavities or grooves, which are not directly adjacent to said strip or another strip (thereby additionally removed from the strip).
[000131] Said first reservoir of the moving infinite surface can be at least partially permeable to air, and said first infinite moving surface can have a cylindrical surface with said reservoirs, and move in a rotating manner around a stator , which comprises a vacuum chamber, said second external housing of the moving surface can be cylindrical, and rotate around a stator, comprising a secondary vacuum chamber connected to said secondary vacuum system.
[000132] The method further comprises the step of i) applying an adhesive material to the absorbent structure of step h, and optionally applying an adhesive material (i.e., a second adhesive material) to said substrate layer, before step f, or simultaneously with it, but in no event before step g) •
[000133] Step i) 1) may involve dispersion of said first adhesive material in the form of fibers over said absorbent layer, or part of it, for example, substantially continuously, so that it is also present in the said channels.
[000134] Step i) 2) may involve extrusion coating or spray coating of the support blade, or continuously, or, for example, in a pattern that corresponds to the channel pattern. An absorbent structure obtained by said method can then be combined with a channel-free absorbent structure, or with another absorbent structure made by this method to provide an absorbent core.
[000135] The dimensions and values presented in the present invention should not be understood as being strictly limited to the exact numerical values mentioned. Instead, unless otherwise specified, each of these dimensions is intended to mean both the mentioned value and a range of functionally equivalent values around that value. For example, a dimension displayed as "40 mm" is intended to mean "about 40 mm".
[000136] All documents cited in the Detailed Description of the Invention are, in their relevant part, incorporated herein, by reference. The citation of any document should not be interpreted as an admission that it represents prior art with respect to the present invention. If there is a conflict between any meaning or definition of a term mentioned in this document and the meaning or definition of the same term in a document incorporated by way of reference, the meaning or definition attributed to the term mentioned in this document will take precedence.
[000137] Although specific embodiments of the present invention have been illustrated and described, it should be obvious to those skilled in the art that various other changes and modifications can be made without departing from the character and scope of the invention. Therefore, it is intended to cover in the appended claims all such changes and modifications that fall within the scope of the present invention.

权利要求:
Claims (11)
[0001]
i. Disposable diaper (1), having a transversal and longitudinal dimension, comprising a lower layer (6), an upper layer (5) and an absorbent core (7) disposed between them, wherein the absorbent core comprises a first absorbent structure ( 15) and a second absorbent structure (15 ') to form a laminate, each of the first absorbent structure and the second absorbent structure having a user-facing surface and a clothing-facing surface comprising a substrate layer (16 , 16 ') and an absorbent layer (17, 17'), in which each absorbent layer comprises particles of absorbent polymer (50) is cellulose free, supported by, and immobilized on the substrate layer, where the absorbent layer has : ii. a transverse (N) and longitudinal (M) dimension, iii. a pair of opposite longitudinal edges (18) extending in the longitudinal dimension, iv. . a pair of opposite transverse edges (19) extending in the transverse dimension, v. . an anterior region, between the thighs and posterior (21, 23, 22) sequentially arranged in the longitudinal dimension, vi. two longitudinal parts delimited by a plane with a dimension that is coextensive with a central longitudinal axis of the absorbent structure and a second dimension that is perpendicular to the central longitudinal axis of the absorbent structure and a central transverse geometric axis, characterized by each absorbent layer comprise at least two channels (26), each channel being substantially free of the absorbent polymeric particles that extend through the thickness of the absorbent layer in its longitudinal dimension, wherein each longitudinal part of the absorbent layer comprises one of the channels, and in which each among the channels: a. has a width of at least 4% of the transverse dimension of the absorbent layer, b. extends over at least 15% of the longitudinal dimension of the absorbent layer, and c. it is at least present in the region between the thighs, or part of it, as long as the absorbent layer does not comprise channels substantially free of particles of absorbent polymer that extend in its transversal dimension in the region between the thighs, and do not comprise channels substantially free of polymeric absorbent particles that extend to their longitudinal and transverse edges; the absorbent core comprising a capture system disposed between the top layer and the user facing surface of the absorbent structure, where the capture system is in direct contact with the absorbent structure, so that the capture system fills at least partially the at least two channels of the first absorbent structure; where the distance between two of the at least two channels in the region between the thighs is at least 5% of the transverse dimension of the absorbent layer in the region between the thighs and the distance between two between the at least two channels in the region between the thighs it is at least 20 mm or at least 30 mm in the region between the thighs.
[0002]
2. Disposable diaper, according to claim 1, characterized by the fact that each of the two channels (26) extends up to 90% of the longitudinal dimension of the absorbent layer (17).
[0003]
Disposable diaper according to claim 1, characterized in that the absorbent structure comprises one or more additional channels (26 ') substantially free of polymeric absorbent particles, which extend through the thickness of the absorbent layer in the longitudinal dimension or cross section of the absorbent layer, in which one or more additional channels are at least 3 mm wide.
[0004]
4. Disposable diaper, according to claim 3, characterized in that the additional channels (26 ') are distributed in any of the anterior and posterior regions of the absorbent layer.
[0005]
5. Disposable diaper, according to claim 3, characterized by the fact that the additional channels (26 ') are longitudinal channels.
[0006]
6. Disposable diaper, according to claim 3, characterized by the fact that any of the channels (26, 26 ') are straight channels, oblique channels, curved channels or angled channels.
[0007]
7. Disposable diaper according to claim 1, characterized in that the substrate layers (16, 16 ') of the first absorbent structure and the substrate layer (16, 16') of the second absorbent structure are mirror images one of the other and are combined so that a channel (26 ') of the absorbent layer of the second absorbent structure overlaps with at least one channel (26) of the absorbent layer of the first absorbent structure to form one or more channels through the thickness of the laminate .
[0008]
Disposable diaper according to claim 7, characterized in that the substrate layer (16) of the first absorbent structure is connected to the substrate layer blade (16 ') of the second absorbent structure by one or more channels.
[0009]
9. Disposable diaper according to claim 1, characterized by the fact that the substrate layer of one of the absorbent structures undulates in one or more of the channels.
[0010]
10. Disposable diaper, according to claim 1, characterized by the fact that the channels have a width of 6 to 10 mm.
[0011]
11. Disposable diaper according to claim 1, characterized in that the absorbent polymer particles are immobilized by a thermoplastic adhesive material (40) layer of substrate.

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BR112015013461B1|2021-09-28|ABSORBENT ITEMS WITH CHANNELS

同族专利:

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公开号 | 公开日

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DE202012013585U1|2018-01-17|

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US20150038931A1|2015-02-05|

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CN103596534A|2014-02-19|

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EP3284449A1|2018-02-21|

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BR112013031707A2|2016-12-13|

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US20120316528A1|2012-12-13|

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US20190365579A1|2019-12-05|

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JP6797954B2|2020-12-09|

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RU2671283C1|2018-10-30|

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RU2630211C1|2017-09-05|

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RU2013156978A|2015-09-10|

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US10517777B2|2019-12-31|

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CA2838951A1|2012-12-13|

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EP3266430A1|2018-01-10|

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CL2013003519A1|2014-07-11|

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CA3042501A1|2012-12-13|

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JP2017124188A|2017-07-20|

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JP2019093194A|2019-06-20|

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EP3284449B1|2019-10-02|

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CN103596534B|2017-04-12|

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ZA201400178B|2016-01-27|

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CA2838951C|2019-07-16|

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CA3042501C|2020-06-23|

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US10893987B2|2021-01-19|

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US10149788B2|2018-12-11|

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JP2014515983A|2014-07-07|

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EP2717821A1|2014-04-16|

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PL3284449T3|2020-03-31|

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RU2568565C2|2015-11-20|

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EP3266430B1|2020-07-01|

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MX2013014585A|2014-03-31|

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WO2012170781A1|2012-12-13|

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US20180207039A1|2018-07-26|

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US20190365578A1|2019-12-05|

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CN105816277A|2016-08-03|

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EP2717821B1|2019-08-07|

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法律状态:
2018-12-11| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|

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2019-10-01| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|

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2020-07-07| B09A| Decision: intention to grant|

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2020-11-17| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 08/06/2012, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

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申请号 | 申请日 | 专利标题

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US201161495406P| true| 2011-06-10|2011-06-10|

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US61/495,406|2011-06-10|

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PCT/US2012/041495|WO2012170781A1|2011-06-10|2012-06-08|Disposable diapers|

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