Patent Application
20220047432
The present invention relates generally to absorbent articles and, more particularly, to absorbent articles having an absorbent core configured to lift away from a chassis of the article to define a containment zone.
Absorbent products can include, for example, baby diapers, training pants, and adult incontinence briefs and underwear, all of which may be made in disposable forms. “Disposable” refers to articles that are designed to be discarded after a limited use rather than being laundered or otherwise restored for reuse. Disposable absorbent products have met with widespread acceptance in the marketplace for a variety of applications, including infant and adult incontinence care, in view of the manner in which such products can provide effective and convenient liquid absorption and retention while maintaining the comfort of the wearer. Such disposable absorbent articles often include a topsheet that is configured to be closest to the wearer during use, a liquid-impermeable backsheet or outer cover, and an absorbent core between the topsheet and the backsheet. In some instances, such disposable absorbent articles also include an acquisition-distribution layer (ADL) disposed between the topsheet and the absorbent core. Elasticated standing leg cuffs and leg gathers are also often used in such articles to provide improved fit and reduced leakage around a wearer's legs, relative to articles without such cuffs or gathers.
U.S. Pat. No. 4,670,011 discloses certain prior art examples of diapers, and U.S. Pat. Nos. 6,976,978 and 4,940,464 disclose certain prior art examples of disposable incontinence garments or training pants.
One example of such a disposable absorbent article is shown in
As shown in
As is known in the art, training pant 10 can include one or more elastic elements coupled to the chassis such that the one or more elastic elements resist expansion of a circumference of the first leg opening and resist expansion of a circumference of the second leg opening. For example, as shown in
Another example of such a disposable absorbent article is shown in
In the view of
As shown in
Each closure member 136 further includes a fastener tab 160 with a first end 164 bonded to back ear 148, a second end 168 shown extending laterally outward from back ear 148, and a fastener portion 172 coupled to the fastener tab. Back ears 148 are each formed of a stretchable elastic material, such as a nonwoven laminate, that permits adjustments in the width and tension of back ears 148 to vary the form and fit of diaper 100 when worn by a user.
Fastener tabs 160 are formed of an inelastic nonwoven material and carry fastener portions 172. Fastener portions 172 include strips of hook material configured to interact with a corresponding loop material in the well-known hook-and-loop fastener arrangement. Connection of closure members 136 to front waist portion 108 is facilitated by a landing zone 176 configured to be engaged by fastener portions 172. In this embodiment, landing zone 176 is defined by an anchoring member that includes a strip of loop material bonded to front waist portion 108 of chassis 104, for example, to the backsheet, and configured to be engaged by the hook material of fastener portions 172.
As shown in
Outer surface 128 is defined by a liquid-impermeable backsheet or cover 192 that defines outer surface 128, and a liquid-permeable topsheet 196 that defines body facing surface 132 and is configured to be closest to the wearer during use. “Liquid impermeable,” when used in describing a layer or multi-layer laminate, means that a liquid, such as urine, will not pass through the layer or laminate, under ordinary use conditions, in a direction generally perpendicular to the plane of the layer or laminate at the point of liquid contact. “Lamination” is the technique of manufacturing a material in multiple layers, so that the composite material has benefits of all the combined layers, such as, for example, improved mechanical strength or durability, improved stability, lower permeability to water, and/or other properties. A laminate includes two or more layers of material(s) that are permanently assembled by heat, pressure, ultrasonic welding, or adhesives.
As shown in
As shown in
As is known in the art, diaper 100 can include one or more elastic elements coupled to the chassis such that the one or more elastic elements resist expansion of a circumference of the first leg opening and resist expansion of a circumference of the second leg opening. For example, as shown in
In configurations in which elastic regions 208 are defined by elastic film, the regions can be defined by separate pieces of elastic film or by separate regions of a single piece of elastic film. As shown in
As shown in
Diaper 100 of
Conventional absorbent articles (e.g., training pant 10 and diaper 100) often fail to provide adequate containment of liquids and/or feces. Prior designs sometimes incorporate leg cuffs on either side of a flat absorbent core to mitigate leakage. Such leg cuffs may not have sufficient hydrostatic head to repel excess liquids and/or feces that are not yet absorbed by the flat absorbent core. Liquids and/or feces can also escape by breaking the seal between the leg cuff and a wearer's leg. As a result, liquids and/or feces may leak from the article and cause discomfort for a wearer. There accordingly is a need in the art for absorbent articles that have improved liquid and/or feces containment.
The present absorbent articles address the need for improved liquid and/or feces containment by incorporating an absorbent core that can define a leakage-mitigating containment zone. The present cores can comprise a laminate longitudinally folded such that each of first and second longitudinally-extending edge regions of the core includes one or more folded laminate layers disposed on a lower laminate layer. At least a portion of the core in each of the edge regions is not bonded to a chassis and thus can lift away from the chassis to define the containment zone. The lifted portions provide an absorbent barrier that impedes the escape of liquid and/or feces, thereby eliminating the need for leg cuffs constructed from high hydrostatic head materials. Liquids and/or feces that escape the containment zone can be absorbed from underneath the lifted portions of the core to further mitigate leakage. Such lifting can be facilitated by cuffs that are bonded to at least one of the folded layers and configured to urge the free portions of the core away from the chassis. The cuffs can also at least partially unfold the laminate to increase the volume of the containment zone.
Some articles comprise a chassis having opposing front and rear portions and a crotch portion extending longitudinally between the front a rear portions. In some articles, the chassis is configured to define a wearable configuration. In some articles, the crotch portion is configured to conform about at least one of a wearer's groin area, perineum, and rear when the chassis is in a wearable configuration. In some articles, a first end of the front portion is configured to be coupled to a first end of the rear portion and a second end of the front portion is configured to be coupled to a second send of the rear portion to define the wearable configuration. In such articles, the front and rear portions cooperate to encircle and define a waist opening, a left side of the chassis defines a first leg opening, and a right side of the chassis defines a second leg opening when the chassis is in the wearable configuration.
Some articles have an absorbent core coupled to the chassis. The absorbent core, in some articles, extends longitudinally along the crotch portion and, optionally, comprises a laminate. In some articles, the laminate includes two or more substrate laminae and one or more absorbent laminae. In some articles, each of the absorbent lamina(e) comprises superabsorbent polymer (SAP). In some articles, the SAP of each of the absorbent lamina(e) has a basis weight between 60 and 75 grams per square meter (gsm) and, optionally, has a centrifuge retention capacity between 33 and 52 grams per gram (g/g). In some articles, the SAP of each of the absorbent lamina(e) comprises at least 90%, by weight, SAP. In some articles, a first one of the absorbent lamina(e) is disposed between first and second ones of the substrate laminae. The first substrate lamina, in some embodiments, comprises tissue and, optionally, the second substrate lamina comprises a nonwoven. Some articles comprise three or more substrate laminae and two or more absorbent laminae, where a second one of the absorbent laminae is disposed between the second substrate lamina and a third one of the substrate laminae.
In some articles, the laminate is longitudinally folded such that the absorbent core includes a lower layer of the laminate and, within each of first and second longitudinally extending edge regions, one or more folded layers. The lower layer, in some articles, spans a lateral width of the absorbent core and, in some articles, each of the edge regions spans less than 50%, and optionally at least 20%, of the width of the absorbent core. In some articles, the one or more folded layers in each of the first and second edge regions comprise two or more folded layers. In some of such articles, for each of the first and second regions, a first one of the folded layers is bonded to a second one of the folded layers, optionally with an adhesive. In some articles, the laminate is folded such that, for each of the first and second edge regions, one of the folded layers extends inwardly from a fold of the laminate to an end of the laminate such that the end is disposed closer to the other of the edge regions than is the fold and, optionally, the folded layer is disposed below at least one other of the folded layers. In some articles, the laminate is folded such that, for the lower layer, the second substrate lamina is configured to be disposed closer to a wearer than is the first substrate lamina when the absorbent article is worn.
In some articles, a center region of the lower layer is bonded to the chassis, optionally to the crotch portion. The center region, in some articles, spans a lateral distance smaller than the width of the absorbent core such that at least a portion of the absorbent core in each of the edge regions is configured to lift away from the chassis when the chassis is in the wearable configuration. In some articles, a lowermost one of the folded layer(s) has and extends laterally between first and second portions. In some of such articles, the first portion is disposed closer to the other of the edge regions than is the second portion and, in some articles, the first portion is configured to be disposed on the lower layer when the chassis is in the wearable configuration.
Some articles have first and second longitudinally-extending cuffs. In some articles, each of the cuffs has a first portion coupled to the crotch portion. In some articles, each of the cuffs has a second portion bonded to at least one of the folded layer(s) of a respective one of the first and second edge regions. In some articles, for each of the cuffs, the second portion is configured to lift away from the chassis when the chassis is in the wearable configuration such that the cuff urges at least a portion of the absorbent core away from the chassis. In some articles, each of the cuffs is bonded to an uppermost one of the folded layer(s) of a respective one of the first and second end regions and, optionally, is not bonded to the chassis. In some of such articles, for each of the cuffs, the cuff is bonded to the uppermost one of the folded layer(s) such that a first side is disposed closer to the other of the edge regions than is a second side of the cuff. In some of such articles, for each of the cuffs, the second side of the cuff is configured to lift away from the chassis when the chassis is in the wearable configuration such that the second side is further from the chassis than is the first side and the cuff urges at least a portion of the absorbent core away from the chassis.
In some articles, the absorbent core has first and second ends and extends longitudinally between the first and second ends. Some of such articles have, for each of the first and second ends, an end cap that is coupled to the chassis and extends laterally across the end.
Some articles have a longitudinally-extending insert coupled to the laminate. In some of such articles, for each of the first and second edge regions, a portion of the insert is disposed above the lower layer and/or below at least one of the folded layer(s). In some articles, the insert comprises fluff and SAP and, additionally or alternatively, a through-air bonded polymer nonwoven.
The term “coupled” is defined as connected, although not necessarily directly, and not necessarily mechanically; two items that are “coupled” may be unitary with each other. The terms “a” and “an” are defined as one or more unless this disclosure explicitly requires otherwise. The term “substantially” is defined as largely but not necessarily wholly what is specified and includes what is specified; e.g., substantially 90 degrees includes 90 degrees and substantially parallel includes parallel as understood by a person of ordinary skill in the art. In any disclosed embodiment, the term “substantially” may be substituted with “within [a percentage] of” what is specified, where the percentage includes 0.1, 1, 5, and 10 percent.
The terms “comprise” and any form thereof such as “comprises” and “comprising,” “have” and any form thereof such as “has” and “having,” and “include” and any form thereof such as “includes” and “including” are open-ended linking verbs. As a result, an apparatus that “comprises,” “has,” or “includes” one or more elements possesses those one or more elements, but is not limited to possessing only those elements Likewise, a method that “comprises,” “has,” or “includes” one or more steps possesses those one or more steps, but is not limited to possessing only those one or more steps.
Any embodiment of any of the apparatuses, systems, and methods can consist of or consist essentially of—rather than comprise/include/have—any of the described steps, elements, and/or features. Thus, in any of the claims, the term “consisting of” or “consisting essentially of” can be substituted for any of the open-ended linking verbs recited above, in order to change the scope of a given claim from what it would otherwise be using the open-ended linking verb.
Further, a device or system that is configured in a certain way is configured in at least that way, but it can also be configured in other ways than those specifically described.
The feature or features of one embodiment may be applied to other embodiments, even though not described or illustrated, unless expressly prohibited by this disclosure or the nature of the embodiments.
Some details associated with the embodiments described above and others are described below.
The following drawings illustrate by way of example and not limitation. For the sake of brevity and clarity, every feature of a given structure is not always labeled in every figure in which that structure appears. Identical reference numbers do not necessarily indicate an identical structure. Rather, the same reference number may be used to indicate a similar feature or a feature with similar functionality, as may non-identical reference numbers. Views in the figures are drawn to scale, unless otherwise noted, meaning the sizes of the depicted elements are accurate relative to each other for at least the embodiment in the view.
Referring to
Chassis 304 can have a backsheet configured to face away from a wearer and, optionally, a topsheet configured to face the wearer during use of article 300a. The present backsheets are typically liquid-impermeable and can include, for example, an inner liquid-impermeable film and an outer nonwoven backsheet that can be a nonwoven fabric. A “film” is a membrane-like layer of material formed of one or more polymers, which does not have a form consisting predominately of a web-like structure of fibers and/or other fibers. In some articles, the backsheet can be breathable, for example, an inner liquid-impermeable film of the backsheet can comprise a breathable film. The terms “breathable,” “breathable film,” “breathable laminate” or “breathable outer cover material” or “breathable backsheet” refers to a film, laminate, or outer cover material having a water vapor transmission rate (“WVTR”) of at least about 300 grams/m2/24 hours. Breathable materials typically rely on molecular diffusion of vapor, and are substantially liquid impermeable. “Nonwoven” fabrics, according to an INDA definition, are broadly defined as sheet or web structures bonded together by entangling fiber or filaments, and by perforating films, mechanically, thermally, or chemically. They are flat, porous sheets that are made directly from separate fibers or from molten plastic or plastic film. They are not made by weaving or knitting and do not require converting the fibers to yarn. The basis weight of nonwoven fabrics is usually expressed as gsm or grams per square meter. “Nonwoven backsheet” is a backing substrate layer in the outer cover; a nonwoven backsheet is most often a nonwoven layer facing away from the wearer.
Article 300a can include an absorbent core 328 that extends longitudinally between its opposing first and second ends 392a and 392b. A longitudinal length between first and second ends 392a and 392b can be, for example, greater than or equal to, or between any two of, 300, 330, 360, 390, 420, 450, 480, 510, 540, 570, 560, 600, or more millimeters (mm) (e.g., between 420 and 480 mm). Core 328 can be coupled to crotch portion 316, and can, but need not, extend longitudinally along the entire length of the crotch portion. For example, core 328 can have a longitudinal length at least, or between any two of, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, or 90% smaller than a length of crotch portion 316, and optionally can be positioned closer to front portion 308 than to rear portion 312. Core 328 can comprise any material or combination of materials suitable for absorbing liquids, such as, for example, laminate 332. Laminate 332 can have one or more substrate laminae (e.g., 336a and 336b) and one or more absorbent laminae (e.g., 340a).
Each of the absorbent lamina(e) can comprise superabsorbent polymer (SAP) particles. “Superabsorbent” or “superabsorbent material” or “SAP” refers to a water-swellable, water-insoluble organic or inorganic material capable, under the most favorable conditions, of absorbing at least about 15 times its weight in an aqueous solution containing 0.9 weight percent sodium chloride and, more desirably, at least about 30 times its weight in an aqueous solution containing 0.9 weight percent sodium chloride and, even more desirably, at least about 50 times its weight in an aqueous solution containing 0.9 weight percent sodium chloride.
Exemplary superabsorbent polymer material suitable for use in core 328 can comprise any superabsorbent polymer particles known from superabsorbent literature, for example such as described in Modern Superabsorbent Polymer Technology, F. L. Buchholz, A. T. Graham, Wiley 1998. For example, the SAP particles may be spherical, spherical-like or irregularly shaped particles, such as sausage shaped particles, or ellipsoid shaped particles of the kind typically obtained from inverse phase suspension polymerizations. The SAP particles can also be optionally agglomerated at least to some extent to form larger irregular particles. In some embodiments, the SAP particles can also have a surface modification, such as a partial or full surface coating, for example to increase the hydrophilicity of the SAP particles.
The SAP materials can be natural, synthetic and modified natural polymers and materials. In addition, the SAP materials can be or include organic compounds such as cross linked polymers. “Cross-linked” is a commonly understood term and refers to any approach for effectively rendering normally water-soluble materials substantially water insoluble, but swellable. Such polymers can include, for example, carboxymethylcellulose, alkali metal salts of polyacrylic acids, polyacrylamides, polyvinyl ethers, hydroxypropyl cellulose, polyvinyl morpholinone, polymers and copolymers of vinyl sulfonic acid, polyacrylates, polyacrylamides, polyvinyl pyridine and the like. Other suitable polymers include hydrolyzed acrylonitrile grafted starch, acrylic acid grafted starch, and isobutylene maleic anhydride copolymers, and mixtures thereof. Organic high-absorbency materials can include natural materials, such as agar, pectin, guar gum and peat moss. In addition to organic materials, superabsorbent materials may also include inorganic materials, such as absorbent clays and silica gels. Suitable examples of SAP include T9030, T9600, T9900, and Saviva polymers from BASF Corporation in Charlotte, North Carolina; and W211, W112A, W125, S125D, QX-W1482, QX-W1486, QX-W1504, and QX-W1505 from Nippon Shokubai Co. Ltd, N.A.I.I. in Houston, Texas; and AQUA KEEP SA50 II, SA55SX II, SA6ON II, SA65S, HP500E, HP600, and HP 700E from Sumitomo Seika Chemicals Co., Ltd. in Osaka, Japan.
In some articles, the SAP can have a centrifuge retention capacity of 20-60 grams per gram (g/g), for example 30-50 g/g or 33-52 g/g, optionally between 33 and 38 g/g, or optionally between 44 and 48 g/g. The SAP can have particle size distribution (PSD) with most or substantially all particles having a diameter between 150 μm and 850 μm. Preferably, all or substantially all of the SAP particles in at least one of the absorbent lamina(e) have a diameter less than or equal to 500 micrometers (pm) to reduce the roughness of the absorbent lamina. For example, ones of the SAP particles in absorbent lamina 340a having a diameter greater than or equal to 500 μm can account for less than 10% (e.g., less than 3% or less than 0.2%) of the mass of the SAP particles in the lamina. An illustrative SAP suitable for absorbent lamina 340a is HP500E from Sumitomo Seika Chemicals Co., Ltd. in Osaka, Japan. As used herein, particle diameter refers to the equivalent diameter of the particle if the particle is modelled as a sphere.
In some embodiments, the SAP material of the absorbent lamina(e) can be disposed within a matrix of adhesive material. Suitable adhesive material can include, for example, a thermoplastic hot-melt adhesive composition or a pressure-sensitive thermoplastic adhesive composition. For example, absorbent lamina 340a can comprise at least 90% (e.g., greater than 93% or 94%), by weight, SAP and less than or equal to 10% (e.g., less than 6% or 7%), by weight, adhesive. To illustrate, the SAP of absorbent lamina 340a can have a basis weight of at least 40 grams per square meter (gsm), such as, for example, greater than or equal to or between any two of 40, 50, 60, 70, 80, 90, 100 or more gsm (e.g., between 60 and 75 gsm).
Each of the substrate lamina(e) can be constructed from nonwoven material and/or tissue. Suitable nonwoven materials can include, for example, spunbond, spunlace, or carded webs of one or more polymers, including polypropylene, polyethylene, nylon, polyester, and blends of these materials. When constructed from a nonwoven, a substrate lamina can have a basis weight of at least 20 gsm, such as, for example, a basis weight greater than or equal to, or between any two of, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, or more gsm (e.g., between 20 and 30 gsm, or 28 gsm, or between 45 and 55 gsm). Suitable tissues can include, for example, porous tissues, creped tissues, and standard tissues. When constructed from tissue, a substrate lamina can have a basis weight of at least 10 gsm, such as, for example, a basis weight greater than or equal to, or between any two of, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, or more gsm.
The substrate lamina(e) can facilitate liquid acquisition and distribution throughout core 328. SAP in the absorbent lamina(e) swells when it absorbs liquid, which can impede liquid distribution throughout core 328 (referred to as “gel blocking”). Tissue and/or nonwoven substrate lamina(e) can mitigate gel blocking by promoting the acquisition and distribution of liquid throughout the absorbent lamina(e). To illustrate, laminate 332 can have a first substrate lamina 336a constructed from tissue, a second substrate lamina 336b constructed from a nonwoven, and an absorbent lamina 340a comprising at least 90% SAP by weight. Absorbent lamina 340a can be in contact with and disposed between first substrate lamina 336a and second substrate lamina 336b (
In other embodiments, laminate 332 can have any suitable number of substrate and absorbent laminae arranged in any suitable order, such as, for example, greater than or equal to or between any two of 1, 2, 3, 4, 5, 6, 7, 8, or more substrate laminae and greater than or equal to or between any two of 1, 2, 3, 4, 5, 6, 7, 8, or more absorbent laminae. For example, any two adjacent laminae in laminate 332 can be the same type of laminae (e.g., both can be substrate laminae or absorbent laminae) or laminae of different types (e.g., one can be one of the substrate lamina(e) and one can be one of the absorbent lamina(e)). By way of illustration, laminate 332 can comprise three substrate laminae and two absorbent laminae arranged such that each of the absorbent laminae is disposed between two of the substrate laminae. Providing additional laminae can increase the absorption capacity of laminate 332.
Laminate 332 can be folded one or more times such that core 328 includes multiple laminate layers, including a lower layer 356 and one or more folded layers (e.g., 360a and 360b) disposed on the lower layer within each of first and second longitudinally-extending edge regions 348a and 348b. For example, as shown, core 328 includes a folded layer 360a in first edge region 348a and a folded layer 360b in second edge region 348b. Lower layer 356 can span lateral width 344 of core 328, and folded layers 360a and 360b can each span less than half of width 344 such that a gap is disposed between the folded layers. For example, each of edge regions 348a and 348b can have a width (e.g., 352a and 352b, respectively) that spans less than or equal to, or between any two of, 50%, 40%, 30%, 20%, or 10% (e.g., between 20% and 46% or between 40% and 46%) of width 344. To illustrate, width 344 of core 328 can be greater than or equal to, or between any two of, 80, 90, 100, 110, 120, 130, 140, or more millimeters (mm) (e.g., between 100 and 120 mm) and each of widths 352a and 352b can be less than or equal to, or between any two of, 70, 60, 50, 40, 30, 20, 10, or fewer millimeters (mm) (e.g., between 10 and 20 mm or between 30 and 65 mm).
Core 328 can be coupled to chassis 304 such that the core defines a containment zone 366 for liquids and/or feces when article 300a is worn. Lower layer 356 can have a center region 364 coupled to crotch portion 316 via a bond 372, which can be, for example, an adhesive, ultrasonic, or thermal bond. Center region 364 can span a lateral distance 368 that is smaller than width 344, such as, for example, a distance that is smaller than or between any two of 90%, 80%, 70%, 60%, 50%, 40%, 30%, or 20% of width 344. To illustrate, distance 368 can be less than or equal to, or between any two of, 120, 110, 100, 90, 80, 70, 60, 50, 40, 30, 20, 10, or fewer millimeters (mm) (e.g., between 70 and 90 mm). Center region 364 can, but need not, overlap edge regions 348a and 348b. For example, at least one of the folded layers in each of edge regions 348a and 348b can be partially disposed on lower layer 356 within center region 364. Because bond 372 spans only part of width 344, at least a portion of core 328 within each of edge regions 348a and 348b can be free and lift away from chassis 304 towards a wearer when the chassis is in the wearable configuration (
Edge regions 348a and 348b, by having multiple layers of laminate 332, can have more SAP than the other portions of laminate 332. The additional SAP can both increase the absorption capacity of the edges of laminate 332 and facilitate formation of containment zone 366 when the SAP in the edge regions swells. And when one of the substrate lamina(e) functions as a topsheet (e.g., when the substrate lamina is a nonwoven), article 300a can omit a conventionally-used topsheet layer that would otherwise impede the expansion and/or unfolding of core 328 in use. For example, a nonwoven substrate lamina can be disposed closer to a wearer than are the other lamina(e) when article 300a is worn, at least for lower layer 336 and additionally, or alternatively, for an uppermost one of the folded layer(s) in each of edge regions 348a and 348b.
Article 300a can include cuffs 376 coupled to at least one of the folded layers to facilitate the lifting of the free portions of core 328. For example, within each of edge regions 348a and 348b, a cuff 376 can be coupled to an uppermost one of the folded layer(s) (e.g., 360a or 360b) via a bond 388, such as, for example, an adhesive, ultrasonic, or thermal bond. In other embodiments, however, each of cuffs 376 can be bonded to a respective one of the outermost, longitudinally-extending folded edges of core 328. Cuffs 376 can be configured to lift away from chassis 304 when the chassis is in the wearable configuration and thereby urge the free portions of core 328 to unfold away from the chassis as well. For example, as shown, each of cuffs 376 has opposing first and second longitudinally-extending sides 380 and 384 and is bonded to a respective one of folded layers 360a and 360b such that the first side is disposed closer to the other of the folded layers than is the second side. For each of cuffs 376, the cuff can be elastic and/or second side 384 can be ruffled such that, when chassis 304 is in the wearable configuration, the second side rises (e.g., such that the second side is further from the chassis than is first side 380) and thereby urges at least a portion of core 328 away from the chassis. When so bonded, cuffs 376 can also at least partially unfold the core to increase the volume of containment zone 366. The free portions of core 328 and each of cuffs 376, when lifted, can form a leak-prevention gasket around the legs of a wearer to further mitigate leakage.
Additionally, or alternatively, laminate 332 can be riffled such that a plurality of ridges extend longitudinally (e.g., in the machine direction) along the laminate. The ridges can also promote the lifting of the free portions of core 328 away from chassis 304.
Article 300a can include end caps 396. Each of end caps 396 can be coupled to chassis 304, extend laterally across a respective one of first and seconds ends 392a and 392b of core 328, and, optionally, extend longitudinally to a respective one of the front and rear edges of chassis 300a. End caps 396 can inhibit leakage out of ends 392a and 392b while still permitting portions of core 328 to lift away from chassis 304.
As shown, cuffs 376 are not connected to chassis 304, but can be connected to the chassis in other embodiments. Referring to
Core 328 can include any suitable number of folded layers within each of edge regions 348a and 348b, such as, for example, greater than or equal to or between any two of 1, 2, 3, 4, 5, 6, 7, 8, or more folded layers. For example, referring to
Some cores can be folded such that one or more of the folded layer(s) in each of edge regions 348a and 348b form longitudinal dams to improve liquid containment. For example, referring to
In some cores, longitudinal dams can be formed from multiple folded layers. Referring to
Referring to
Additionally, or alternatively, core 328 can comprise multiple laminates 332a and 332b, each having one of the arrangements of absorbent lamina(e) and substrate lamina(e) described above with respect to laminate 332. Laminates 332a and 332b can, but need not, have the same arrangement of laminae. As shown, laminates 332a and 332b can be layered such that lower layer 356 and folded layers 360b, 360e, 360g, and 360j originate from laminate 332a and folded layers 360a, 360c-360d, 360f, and 360h-360i originate from laminate 332b. In other embodiments, core 328 can have any suitable number of laminates, such as, for example, greater than or equal to or between any two of 1, 2, 3, 4, 5, 6, 7, 8, or more laminates layered and folded such that lower layer 356 originates from one of the laminate(s), and greater than or equal to, or between any two of, 1, 2, 3, 4, 5, 6, 7, 8, or more folded layers originate from each of the laminate(s).
The folded layers can, but need not, be the same size, regardless of whether core 328 comprises a single laminate (e.g., 332) or multiple laminates (e.g., 332a and 332b). To illustrate, for each of edge regions 348a and 348b, each of the folded layer(s) can span the entire width of the edge region (e.g., 352a or 352b) but, in some embodiments, one or more of the folded layer(s) can span a distance that is less than, or between any two of, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, or 90% of the width of the edge region. For example, as shown, folded layers 360a and 360f can each span a lateral distance larger than that spanned by each of the other folded layers. When core 328 has differently-sized folded layers, the core can define multiple channels between edge regions 348a and 348b (e.g., one between folded layers 360a and 360f and one between the stack of folded layers 360b-360e and the stack of folded layers 360g-360j). Providing multiple channels can improve fluid management.
Referring to
Within each of edge regions 348a and 348b, a portion of insert 412 can be disposed above lower layer 156 and below at least one of the folded layer(s) (e.g., 360b-360c and 360e-360f) to mitigate leakage and promote insert retention. For example, liquid absorbed and distributed by insert 412 can be contained within containment zone 366 to reduce runoff. As shown, a first portion of insert 412 is disposed between folded layers 360a and 360b and a second portion of the insert is disposed between folded layers 360d and 360e. In other embodiments, however, insert 412 can be disposed on lower layer 156 such that, within each of edge regions 348a and 348b, a portion of the insert is disposed between the lower layer and one of the folded layers (e.g., 360a or 360d).
In some embodiments, core 328 can be disposed above insert 412 (e.g., when the insert comprises fluff and SAP). For example, insert 412 can be integrated into chassis 304 (e.g., between a topsheet and a backsheet of the chassis) and lower layer 156 can be bonded to the topsheet. Additionally or alternatively, lower layer 156 can be bonded to an upper surface of core 328. The materials used in laminate 332 of core 328 can be selected such that the core has comparatively higher permeability to facilitate liquid transfer to insert 412 and maintain a dry wearer-facing surface. For example, second substrate lamina 336b can comprise a comparatively lighter nonwoven (e.g., having a basis weight between 20 and 35 gsm) and absorbent lamina 340a can comprise a comparatively lighter SAP (e.g., having a basis weight between 60 and 75 gsm).
The above specification and examples provide a complete description of the structure and use of illustrative embodiments. Although certain embodiments have been described above with a certain degree of particularity, or with reference to one or more individual embodiments, those skilled in the art could make numerous alterations to the disclosed embodiments without departing from the scope of this invention. As such, the various illustrative embodiments of the methods and systems are not intended to be limited to the particular forms disclosed. Rather, they include all modifications and alternatives falling within the scope of the claims, and embodiments other than the one shown may include some or all of the features of the depicted embodiment. For example, elements may be omitted or combined as a unitary structure, and/or connections may be substituted. Further, where appropriate, aspects of any of the examples described above may be combined with aspects of any of the other examples described to form further examples having comparable or different properties and/or functions, and addressing the same or different problems. Similarly, it will be understood that the benefits and advantages described above may relate to one embodiment or may relate to several embodiments.
The claims are not intended to include, and should not be interpreted to include, means-plus- or step-plus-function limitations, unless such a limitation is explicitly recited in a given claim using the phrase(s) “means for” or “step for,” respectively.
This application claims priority to U.S. Provisional Application No. 62/775,431, filed Dec. 5, 2018, the contents of which is incorporated into the present application in its entirety.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/US2019/064126 | 12/3/2019 | WO | 00 |
| Number | Date | Country | |
|---|---|---|---|
| 62775431 | Dec 2018 | US |
