Absorbent article with stenosis stabilizing elements

Abstract

An absorbent article is provided having a longitudinal centerline extending in a longitudinal direction, and a lateral centerline extending in a lateral direction perpendicular to the longitudinal direction, the lateral centerline equally dividing the absorbent article into a front half and a rear half. The absorbent article includes a liquid permeable topsheet located on a wearer-facing side, a liquid impermeable backsheet located on a garment-facing side, an absorbent core, and a stabilizing element. The stabilizing element has a width (W2) of no more than 50 mm, measured at a point C provided at 40 mm in the direction of the transverse centerline towards the front end of the article.

Description

Technical Field

[0001] The present invention relates to personal hygiene absorbent articles. These articles may in particular be adult incontinence ("AI") products, such as light adult incontinence pants. Background Art

[0002] In recent years, the demographics of many countries have shown a shift toward middle-aged and older adults. This demographic represents a correspondingly increased demand for products and services designed to address issues associated with aging. One major issue is adult urinary incontinence ("AI"). Urinary incontinence can be caused or exacerbated by a variety of health conditions or even normal experiences such as childbirth.

[0003] Disposable absorbent pants for people with urinary incontinence have been commercially available for many years. Traditionally, these products were larger versions of disposable baby toddler pants. One design type is known as a "belt" or "balloon" pants, which consists of a wide belt that wraps around the wearer's waist and lower torso, with the front and back sections of the belt connected by an absorbent pad assembly that bridges the wearer's crotch area. The crotch absorbent pad assembly includes an absorbent core designed to receive, contain, and store urine until the pants are changed. The belt is typically formed from a stretch laminate.

[0004] The absorbent material in the absorbent core is typically a mixture of cellulose fibers and superabsorbent polymer (SAP) particles. When loaded with a small amount of urine, it is prone to wrinkling and accumulation due to the wet collapse effect of the pulp fibers. This is particularly problematic for AI products because the product is worn in a low-load state for most of the time (while highly loaded products are replaced immediately).

[0005] Behavioral research on AI consumers indicates that comfort and fit during use are the primary factors influencing consumer preferences, with leak protection being a secondary consideration. This is believed to be because consumers (at least non-institutional users) view the purchase of adult incontinence products as a safeguard against unexpected heavy urinary leakage ("UUL"). However, due in part to preventative measures (such as frequent toileting), consumers who use AI products rarely experience heavy urinary leakage ("UUL"). In reality, minor leaks are the majority. Therefore, unlike baby diapers, adult wearers mostly wear AI products dry or nearly dry. If the product becomes overloaded, adult wearers will typically change the product as soon as possible. Because incontinence products are worn for extended periods and generate little or no UUL, consumers prioritize an underwear-like wearing experience (comfort and fit) over the long-lasting dryness and high absorbency of baby diapers.

[0006] This analysis led to a counterintuitive conclusion: compared to other absorbent products, the ideal core design for AI products should prioritize flexibility and the ability to absorb frequent, small amounts of urine rather than sudden, large amounts. However, it was found that thin, flexible products were also more likely to wrinkle or dig into the wearer's crotch. This increased wrinkling is believed to stem from product design: to ensure sufficient absorbent capacity, the width of the absorbent pad assembly is often greater than the width of the wearer's crotch. Although increasing the core thickness can prevent wrinkling, it may also cause discomfort to the wearer. Summary of the Invention

[0007] The present invention relates to a personal hygiene absorbent product. The product is virtually divided into a left half and a right half along a longitudinal centerline extending in the longitudinal direction, and is divided into a front half and a rear half along a transverse centerline extending in the transverse direction perpendicular to the longitudinal direction. The absorbent product comprises a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent core arranged between the top sheet and the back sheet. The absorbent core comprises a core wrap and an absorbent material layer arranged in the core wrap.

[0008] To address the aforementioned issues, it has been discovered that providing a narrow stabilizing element at least in the crotch region of an absorbent article can reduce wrinkling in this region, which is most noticeable visually and tactilely. The stabilizing element and the absorbent core are positioned between the topsheet and the backsheet and overlap at least at point C, which is located approximately 40 mm from the transverse centerline toward the front end of the article and is laterally aligned with the absorbent material layer of the absorbent core.

[0009] The width of the stabilization element at or adjacent to point C does not exceed 50 mm, as measured in the transverse direction according to the "Width and Thickness Measurement Method" described herein. The stabilization element may generally have a width in the range of about 20 mm to about 50 mm, particularly in the range of 20 mm to 40 mm, which has been found to provide improved stability to the article while being narrow enough to avoid compression on the inner thigh during walking or other activities.

[0010] The article can be an adult incontinence product. The absorbent article can be a belted adult incontinence pant, but other product forms are also possible, such as adhesive diapers. Exemplary dimensions, materials, and properties of the stabilizing element are further disclosed in the following description and the appended claims, along with other aspects of the present invention. The absorbent article can also specifically include any of the following elements, alone or in combination.

[0011] The absorbent core is typically wider than the stabilizing element, such that the absorbent core extends laterally beyond the stabilizing element. The absorbent core (including the absorbent material layer contained therein) preferably extends laterally outwardly at least 5 mm beyond point R and 5 mm beyond point L, where points R and L are located 30 mm laterally to the right and left of point C, respectively. On the other hand, the stabilizing element preferably does not extend laterally to either point L or point R.

[0012] The absorbent article may have a first thickness C1 at point C, a second thickness C2 at point R, and a third thickness C3 at point L (wherein these thicknesses are measured according to the "Width and Thickness Measurement Method" disclosed herein). The ratio C1 / (C2+C3) may have a value of at least 0.6, and may specifically be in the range of 0.6 to 3.0, more specifically in the range of 0.65 to 1.0. The thickness C1 may be less than 5.0 mm. The average value (C2+C3) / 2 may be less than 4.5 mm.

[0013] The stabilizing element may have urine acquisition and / or distribution properties.

[0014] The stabilizing element may comprise or consist of cross-linked cellulose fibers.

[0015] The stabilizing element may comprise or consist of a hydroentangled layer.

[0016] The stabilizing element may have a basis weight of 50 gsm to 200 gsm.

[0017] The incontinence product may be an adult incontinence pants.

[0018] The absorbent material may consist essentially of superabsorbent polymers (although other absorbent materials are also possible). BRIEF DESCRIPTION OF THE DRAWINGS

[0019] While the specification concludes with claims particularly pointing out and distinctly claiming the invention, it is believed the invention will be better understood from the following description when read in conjunction with the accompanying drawings, in which:

[0020] Figure 1 is a schematic perspective view of an exemplary adult incontinence pants;

[0021] Figure 2 for Figure 1 a schematic top view (wearer-facing surface) of an incontinence pant in an unfolded, laid-flat position with the side seams unfolded and showing the absorbent pad assembly positioned between the front and back belts;

[0022] Figure 3 is a schematic cross-sectional view of an absorbent pad assembly;

[0023] Figure 4 is a schematic cross-sectional view of an alternative absorbent pad assembly;

[0024] Figure 5 is a top view of the absorbent pad assembly, showing the positions of points C, R, and L;

[0025] Figure 6 and Figure 7 This is a top view of a conventional absorbent pad assembly. DETAILED DESCRIPTION

[0026] definition

[0027] As used herein, the terms "nonwoven," "nonwoven web," and "nonwoven layer" are used interchangeably. A nonwoven is broadly defined as a predominantly planar assembly of engineered fibers that has been imparted an engineered level of structural integrity by physical and / or chemical means, excluding weaving, knitting, or papermaking.

[0028] Nonwovens can be formed by many processes, such as meltblowing, spunbonding, solvent spinning, electrostatic spinning and carding, and the fibers can be consolidated, for example, by spunlace (in spunlace nonwovens), through-air bonding (using hot air blown through the fiber layer in the thickness direction), needlepunch, one or more bonding patterns and bonding impressions produced by localized pressure and / or applying heat or ultrasonic energy, or a combination of these processes. Alternatively or in addition, the fibers can be consolidated by using a binder. The binder can be provided in the form of binder fibers (which are subsequently melted), or can be provided in liquid form, such as styrene butadiene binder. The liquid binder is applied to the fibers (for example, by spraying, printing or foam coating) and subsequently cured to achieve finalization. The basis weight of nonwoven fabrics is typically expressed in grams per square meter (g / m2). 2 )express.

[0029] Nonwoven materials can be formed from a variety of fiber materials (PP, PE, PET, coPET, bicomponent fibers, natural fibers, and mixtures thereof). Synthetic fibers can be selected from the group consisting of polyolefins (such as polyethylene, polypropylene, or combinations and mixtures thereof), polyethylene terephthalate (PET), co-PET, polylactic acid (PLA), polyhydroxyalkanoates (PHA), or mixtures or combinations thereof. Natural fibers are, for example, cotton or bamboo fibers, or of man-made origin. Fibers can be short fibers (e.g., in carded nonwoven webs / layers) or long fibers (e.g., in spunbond or meltblown nonwoven webs / layers). In some cases, the fibers or nonwovens can be treated to enhance specific fluid handling properties, such as fluid permeability or fluid barrier properties.

[0030] The term "hydroentangled fabric" or "hydroentangled nonwoven" refers to a nonwoven in which the fibers are entangled and consolidated with each other by means of multiple high-pressure water jets penetrating a moving fleece or fabric. These water jets penetrate the fleece or fabric like needles, causing the fibers to interweave in three dimensions. These hydroentangled nonwovens are essentially defined by the fact that their consolidation is caused by hydroentanglement. Hydroentangled nonwovens can be a single layer structure (homogeneous), but can also be formed from two or more layered structures with different fiber mixes, which are bonded to each other through a hydroentanglement process. Before being combined into a single nonwoven by hydroentanglement, the two or more layered structures may have been subjected to a bonding process, such as by applying heat and / or pressure using, for example, a patterned calender roll and anvil roll to impart a bonding pattern. However, the two or more layered structures are bonded to each other solely through hydroentanglement.

[0031] As used herein, the term "dtex" refers to a unit used to indicate the fineness of a filament / fiber. The unit represents the mass in grams per 10,000 meters of length of the filament / fiber.

[0032] What " hydrophilicity " describes is the characteristic that substrate surface can be wetted by aqueous fluid (for example, concentration is 0.9% NaCl physiological saline solution) that is deposited on these substrates.Hydrophilicity and wettability are usually defined according to the contact angle and the soak-through time of fluid for example by nonwoven fabric.In the publication of the American Chemical Society that is entitled " Contact angle, Wettability and Adhesion " (copyright 1964) that Robert F. Gould writes, this is discussed in detail.When the contact angle between fluid and surface is less than 90 °, or when fluid tends to spread spontaneously along substrate surface, it can be said that this substrate surface is wetted by fluid (being hydrophilic), and these two conditions coexist usually.On the contrary, if contact angle is greater than 90 ° and fluid can not spread spontaneously along fiber surface, then think that substrate is " hydrophobic ".

[0033] "Longitudinal" refers to the direction extending perpendicularly from the middle of the waist edge to the middle of the opposing waist edge of the article, nominally defined as the longitudinal centerline. The absorbent article is constructed symmetrically about the longitudinal centerline so that the longitudinal centerline divides the article into left and right halves. "Transverse" refers to the direction perpendicular to the longitudinal direction, and the transverse centerline is an imaginary line perpendicular to the longitudinal centerline that divides the article into front and rear halves of equal length. As used herein, "longitudinally extending" refers to the characteristic of an article that extends in the longitudinal direction for at least twice as long as it extends in the transverse direction.

[0034] "Body-facing" and "garment-facing" refer to the relative position of an element or surface of an element or group of elements, respectively. "Body-facing" means that the element or surface is closer to the wearer during wear than another element of the same component. "Garment-facing" means that the element or surface is farther away from the wearer during wear than another element of the same component. A garment-facing surface can face another article of clothing of the wearer, or other items such as bedding or the atmosphere.

[0035] "Include" or "comprising" are open-ended terms, each specifying the presence of a feature followed by a component, but not excluding the presence of other features, such as elements, steps, or components, known in the art or disclosed herein. These terms based on the verb "comprise / include" encompass the narrower term "consisting essentially of," which excludes any unspecified element, step, or ingredient that would materially affect the manner in which the feature functions, and encompass the term "consisting of," which excludes any unspecified element, step, or ingredient.

[0036] absorbent products

[0037] As used herein, the term "absorbent article" refers to a personal hygiene absorbent article that is placed in the crotch region of a wearer to absorb bodily exudates, particularly urine. The absorbent article of the present invention can be specifically placed around the wearer's lower torso so as to encircle the wearer's waist and legs. The absorbent article of the present invention can be specifically a pant-type article, with the waist and leg openings preformed by left and right seams at the edges of the pant-type article. The pant-type article can be preformed using any suitable technique, including but not limited to joining the various parts of the absorbent article together using refastenable and / or non-refastenable joining methods (e.g., sewing, welding, adhesives, cohesive bonding, fasteners, etc.). The pant-type article can be preformed at any location along the circumference of the article (e.g., side fastening, front waist fastening). The present invention can also be used with other types of absorbent articles, such as adhesive-type articles or sanitary napkins. In adhesive-type articles, the rear half of the article can be releasably attached to the front half using a tape system. While the present invention is generally applicable to any type of absorbent article (including infant or toddler diapers), it is particularly suitable for adult incontinence pants.

[0038] Brief description of incontinence pants 10

[0039] Figure 1Described the example of drawstring type or balloon type disposable absorbent pants 10.Pants 10 has waist opening limited by front waist edge 11 and back waist edge 12, and a pair of leg openings limited by corresponding leg opening edge 14.Pants 10 comprises drawstring structure, and it has front piece 20 and back piece 30 that are joined at side seam area 13 place.Usually, side seam is formed by welding / thermal bonding, wherein, by applying the combination of heat and pressure, the polymer material at the edge of front piece and back piece is fused together.Pants 10 can also comprise absorbent pad assembly 50, and this absorbent pad assembly extends through the crotch area of ​​trousers between front piece and back piece.Absorbent pad assembly 50 can be bonded to the inner surface of front piece and back piece by adhesive mode, and hot melt adhesive is applied during manufacturing process to realize this purpose usually.Front drawstring 20 and back drawstring 30 usually comprise elasticized laminate material, such as multiple elastic threads 40 that extend laterally and are sandwiched between two layers of nonwoven substrate.

[0040] Figure 2 Shown Figure 1 The side seams 13a, b of the trouser-type article are unfolded so that the article can be presented in an unfolded and flat state with its side facing the wearer shown. Figure 2 As shown, the article extends longitudinally as indicated by a longitudinal centerline 2 and transversely as indicated by a transverse centerline 4. The longitudinal centerline extends from the midpoint of the front belt edge to the midpoint of the back belt edge and virtually divides the article into a left half and a right half, the two halves being substantially symmetrical. The transverse centerline 2 is disposed in the crotch portion of the article and divides the article into a front half and a rear half of equal length when measured along the longitudinal centerline 2. The intersection of the longitudinal centerline 2 and the transverse centerline 4 is defined herein as the midpoint M.

[0041] See further Figure 2 , the pants 10 include a belt structure that includes a front panel 20 and a back panel 30. In the depicted example, the outer layers of the front and back panels include a continuous layer 32 that is common to both panels. The continuous layer 32 also wraps around the outside of the pants through the crotch area; this configuration is sometimes referred to as a "single-piece" configuration. The outer layer 32 is typically a nonwoven layer. In another possible configuration (not shown), the front panel 20 and back panel 30 can have independent, separate outer layers that have no common layer and are joined to the absorbent pad assembly only by the side seams 13. This alternative configuration is sometimes referred to as a "multi-piece" configuration.

[0042] The front and back panels can each include one or more elastic members, specifically a plurality of transversely extending strands 40 of elastomeric material, such as spandex (e.g., LYCRAHYFIT fiber, a product of Invista Corporation, Wichita, Kansas), laminated between an inner belt layer (not shown) and an outer belt layer 32. The inner and outer belt layers can each be joined together around the elastic strands 40 by adhesive deposited between the layers, thermal bonding, lamination, or a combination thereof. In other examples, the one or more elastic members can be strips or a length of film formed from an elastomeric material. However, elastic strands rather than films may be preferred because they provide flexibility by enabling personalized pre-strain levels, selecting and setting uniform or varying longitudinal spacing between strands, and maintaining a high level of vapor transmission rate (breathability) through the belt laminate, thereby achieving cooling, comfort, and skin health. This flexibility helps manufacturers achieve an enhanced fit for the pant structure around the varying contours and sizes of the wearer's anatomy and imparts a garment-like appearance to the belt laminate. For the purposes of this article, a "strand" is a member having the following characteristics: in the unstrained state, its cross section is perpendicular to the longest dimension and the ratio of the largest dimension to the smallest dimension of the cross section (aspect ratio) does not exceed 2.

[0043] The elastic belt may also or alternatively comprise an elastomeric nonwoven material. Other typical features of incontinence pants articles, in particular the belt / panel structure, can be found, for example, in WO 2018 / 09417 A1 (Minoguchi et al.), WO 2017 / 192992 A1 (Desai et al.) and WO 2016 / 115421 A1 (Seitz et al.).

[0044] Absorbent pad assembly 50

[0045] like Figures 3 and 4 As shown in cross-section in FIG, the absorbent pad assembly 50 may include: a liquid-permeable topsheet 60 located on the wearer-facing side, a liquid-impermeable backsheet 66 located on the garment-facing side, a multicomponent absorbent structure 65 including an absorbent core 26 disposed between the topsheet and the backsheet, and elasticized barrier leg cuffs 80. Other features and combinations thereof may also be included, as described herein. Examples and descriptions of components and configurations of such absorbent pad assemblies may be found in WO 2013 / 122936 A1, where the central chassis described includes components and features that may be included.

[0046] The top sheet 60 can be formed by a nonwoven web material, which is suitably selected to accommodate the components of the absorbent structure 65 while allowing urine to pass freely from the surface facing the wearer to the absorbent structure. The back sheet 66 can include a polymer film material, or at least partially formed by a polymer film material, which is suitably selected to accommodate the components of the absorbent structure, and is also selected to accommodate urine under normal use conditions and prevent urine from seeping through the absorbent structure to the surface facing the clothes. In some examples, the back sheet 66 can also include an outer layer formed by a nonwoven web material to enhance strength and impart a more excellent cloth-like texture. In some examples, the back sheet film can be formed into a breathable structure so that it can allow water vapor to pass through while still preventing aqueous liquid (urine) from penetrating, and this characteristic can contribute to improving the wearer's trouser comfort. The materials used for suitable top sheet and back sheet materials are well known in the art. The materials of the topsheet and backsheet may be joined and bonded together around their peripheries to form an enclosed structure containing the absorbent structure 65 by any suitable bonding mechanism, such as a hot melt adhesive.

[0047] Figure 3 For schematic exploded cross-sectional views, the depicted absorbent pad assembly is shown with the components separated from one another. Some adhesive layers are shown in dashed lines, but it should be understood that the depicted materials can be bonded together to form a pant assembly by any suitable mechanism (e.g., by thermal bonding or by hot melt adhesive deposited between the respective components to be bonded). For example, the top sheet 60 and the back sheet 66 can be bonded together around their peripheries to form an encapsulated structure that accommodates the absorbent structure 65. Similarly, the proximal portion 82 of the barrier leg cuff 80 can be bonded to the top sheet or other portions of the assembly by any suitable mechanism (such as hot melt leg cuff adhesive 69).

[0048] The absorbent article of the present invention comprises a relatively narrow stabilizing element 100. The stabilizing element 100 is preferably arranged between the absorbent core 26 and the top sheet 60, but it is not excluded that it can also be placed between the absorbent core 26 and the back sheet 66, or placed inside the absorbent core 26.

[0049] The absorbent core 26 includes a layer of absorbent material 72 (herein referred to as the "absorbent material layer") sandwiched between a core wrap top layer 91 and a core wrap bottom layer 92. The transverse stabilization member 100 is narrower in the crotch region relative to the rest of the article. The absorbent material layer 72 has a width W1, and the transverse stabilization member 100 has a width W2, both measured in the transverse direction at point C, which is located approximately 40 mm from the midpoint M of the article toward the front end. According to the present invention, W2 should be equal to or less than approximately 50 mm, and preferably, W2 is in the range of approximately 20 mm to approximately 50 mm, more particularly, in the range of 25 mm to 45 mm, and most preferably, in the range of approximately 30 mm to 40 mm. On the other hand, the width W1 of the absorbent material layer 72 of the absorbent core 26 can generally range from 70 mm to 150 mm. The ratio of W1 divided by W2 can be at least about 1.5 (75 / 50), and more particularly, in the range of about 2.0 to about 4.0. Width is measured in the transverse direction (parallel to the transverse centerline), e.g. Figures 3 to 5 and further detailed in the "Width and Thickness Measurement Method" below.

[0050] The beneficial effects of the present invention will be further described in the "Experimental Section" below, and the main components described in the present invention will also be explained in more detail below.

[0051] Stabilizing element 100

[0052] The absorbent article of the present invention includes a narrow stabilizing element 100 that resists excessive lateral compression in the crotch region of the article. The stabilizing element can be positioned between the top sheet and the absorbent core, such as Figures 3 and 4 As shown, however other positioning is possible, such as between the absorbent core and the backsheet.

[0053] A variety of materials can be used for the stabilizing element. The stabilizing element can comprise or consist of synthetic fibers or cellulosic fibers. The stabilizing element can be a fibrous layer comprising unbonded or loosely bound hydrophilic fibers, particularly cross-linked cellulosic fibers. The stabilizing element can also be a nonwoven (such as a spunlace) or an airlaid material. In addition to stabilizing the absorbent article, the stabilizing element can also have fluid acquisition or distribution properties.

[0054] The stabilizing element can, for example, be composed of cross-linked cellulose fibers. The stabilizing element can comprise at least 50% by weight of cross-linked cellulose fibers, and optionally 100% by weight of cross-linked cellulose fibers. The cross-linked cellulose fibers can be pleated, twisted, or curled, or combinations thereof (including pleated, twisted, and curled). This type of material has been previously used in disposable diapers as part of a collection system (e.g., US 2008 / 0312622 A1 (Hundorf)), but in a different manner than the present invention. The cross-linked cellulose fibers provide increased elasticity, thereby enhancing the product's resistance to compression in the packaged state or under conditions of use (e.g., when squeezed by the wearer's thighs).

[0055] The stabilizing element may also be a mechanically integrated nonwoven. Fiber integration of the nonwoven can occur via any suitable process that entangles the staple fibers primarily in the Z direction (positive or negative). Mechanical integration processes include needle punching and hydroentanglement, and do not require chemical or adhesive integration.

[0056] Needle punching involves the mechanical interlocking of fibers in spunbond and / or carded webs. During the needle punching process, multiple barbed needles are repeatedly passed in and out of the nonwoven web, propelling the fibers of the nonwoven web in the positive and / or negative Z direction. In contrast, the hydroentanglement process uses high-speed water jets to induce fiber interlocking in the nonwoven web. The high-speed water jets propel the fibers of the nonwoven web in the positive or negative Z direction. Microscopically, needle punched nonwovens include multiple discrete Z-direction fiber integrations in both the MD and CD directions, while hydroentangled nonwovens typically include integrations that are much more continuous in the MD but discrete in the CD direction.

[0057] Due to the integration of the fibers, such integrated nonwovens do not require adhesives or latex binders to maintain stability. In addition, carded staple fiber nonwovens can be made from a wide variety of suitable fiber types that produce desired performance characteristics. Mechanically integrated stabilizing elements (such as spunlace) can contain a combination of absorbent fibers, reinforcing fibers, and elastic fibers, as further described below (the percentages disclosed apply to spunlace, but may also be applicable to other vertically integrated nonwovens).

[0058] Any suitable absorbent fiber can be utilized. Some conventional absorbent fibers include cotton, rayon or regenerated cellulose or a combination thereof. In one example, the absorbent fiber may include viscose cellulose fibers. The absorbent fiber may include short length fibers. The scope of the short fiber length of the absorbent fiber may be from about 20 mm to about 100 mm, or from about 30 mm to about 50 mm, or from about 35 mm to about 45 mm, specifically including all values ​​within these scopes and any scope formed thereby. Generally, the spunlace fabric may include the absorbent fiber in the following scope: from about 20 wt % to about 75 wt %, or from about 25 wt % to about 60 wt %, or from about 30 wt % to about 50 wt %, specifically including any value within these scopes and any scope formed thereby. In a specific example, the nonwoven may include about 50 wt % of absorbent fibers.

[0059] In addition to absorbent fibers, spunlace fabrics may also include reinforcing fibers. Reinforcing fibers can be used to help provide structural integrity to the nonwoven. Reinforcing fibers can help improve the structural integrity of the nonwoven in both the longitudinal and transverse directions, which can facilitate web manipulation during nonwoven processing for incorporation into disposable absorbent articles. Any suitable reinforcing fibers can be used. Some examples of suitable stiffening fibers include bicomponent fibers comprising polyethylene and polyethylene terephthalate components, or polyethylene terephthalate and copolyethylene terephthalate components. The components of the bicomponent fibers can be arranged in a core-sheath configuration, a side-by-side configuration, an eccentric core-sheath configuration, a trilobal configuration, and the like. In one specific example, the stiffening fibers may include bicomponent fibers having polyethylene / polyethylene terephthalate components arranged in a concentric core-sheath configuration, with the polyethylene being the sheath. For another example, monocomponent fibers may be used, and the constituent materials of the monocomponent fibers may include polypropylene or polylactic acid (PLA). It is noteworthy that these components (eg, polypropylene and polylactic acid) can also be used in bicomponent fibers. The reinforcing fibers can be polyethylene terephthalate (PET) fibers or other suitable non-cellulosic fibers known in the art.

[0060] The staple length of the reinforcing fibers may be in the range of about 28 mm to about 100 mm, or in the range of about 37 mm to about 50 mm. Some carded staple fiber nonwovens include reinforcing fibers with a staple length of about 38 mm to 42 mm. The PET fibers may have any suitable structure or shape. For example, the PET fibers may be round or have other shapes, such as spirals, notched ovals, trilobes, notched ribbons, and the like. In addition, the PET fibers may also be solid, hollow, or hollow in multiple locations. In some embodiments of carded staple fiber nonwovens, the reinforcing fibers may be fibers made of hollow / spiral PET. Optionally, the reinforcing fibers may be spirally pleated or flatly pleated. The reinforcing fibers may have a pleat value between about 4 and about 12 pleats per inch (cpi), or between about 4 and about 8 cpi, or between about 5 and about 7 cpi, or between about 9 and about 10 cpi. Specific non-limiting examples of reinforcing fibers are available from Wellman, Inc. Ireland under the trade designations H1311 and T5974. Other examples of reinforcing fibers suitable for use in the carded staple nonwovens described in detail herein are disclosed in US Pat. No. 7,767,598 (Schneider et al.).

[0061] In general, the hydroentangled nonwoven can include reinforcing fibers in the following ranges: from about 1 wt % to about 50 wt %, or from about 10 wt % to about 40 wt %, or from about 20 wt % to about 30 wt %, specifically including all values ​​within these ranges and any ranges formed therefrom. In a specific example, the nonwoven can include about 20 wt % reinforcing fibers.

[0062] As previously mentioned, the mechanically integrated (e.g., hydroentangled) nonwovens of the present disclosure may additionally include elastic fibers. Elastic fibers help the nonwoven maintain its permeability and cushioning properties. Suitable fibers that can be used include hollow fibers, spiral fibers, and / or hollow spiral fibers. For example, the elastic fibers may have a linear density in the following ranges: about 4 dtex to about 12 dtex, about 6 dtex to about 11 dtex, or about 8 dtex to about 10 dtex, specifically including all values ​​within these ranges and any ranges formed therefrom. In one specific example, the elastic fibers may include hollow spiral polyethylene terephthalate fibers having a linear density of about 10 dtex. In another specific example, the elastic fibers may include round polyethylene terephthalate fibers having a linear density of 6.7 dtex.

[0063] The elastic fibers can be any suitable thermoplastic fibers, such as polypropylene (PP), polyethylene terephthalate, or other suitable thermoplastic fibers known in the art. The staple length of the elastic fibers can range from about 20 mm to about 100 mm, or from about 30 mm to about 50 mm, or from about 35 mm to about 45 mm. The elastic fibers can have a circular cross-section with a spirally curled hollow space at the center. Preferably, 10-15% of the cross-sectional area is hollow, and more preferably, 20-30% of the cross-sectional area is hollow. Without being bound by theory, it is believed that the spiral crimping of the fibers is beneficial to their liquid acquisition and distribution properties. It is hypothesized that the spiral crimping increases the void space in the acquisition member formed by such fibers.

[0064] In general, the hydroentangled fabrics used in the present invention may contain elastic fibers in the following ranges: from about 10% to about 50% by weight, or from about 13% to about 40% by weight, or from about 20% to about 35% by weight, or from about 25% to about 30% by weight, specifically including all values ​​within these ranges and any ranges derived therefrom. In a specific example, the hydroentangled nonwoven of the present invention may include about 30% by weight of elastic fibers.

[0065] To enhance the stabilizing effect of integration, one or more of the fibers may be curled prior to integration. For example, in the case of synthetic fibers, the fibers may be mechanically curled by intermeshing teeth. However, for absorbent fibers, the fibers may be mechanically curled and / or may have a chemically induced curl due to variable cortex thickness formed during absorbent fiber formation.

[0066] In addition to the cross-linked cellulose fibers and mechanically integrated nonwovens (such as spunlace) discussed above, the narrow stabilizing element can also be composed of airlaid materials, which contain fibers bonded to form a continuous, homogeneous fibrous web. Airlaid fibers typically include cellulose fibers, optionally blended with synthetic fibers. Common bonding techniques include latex bonding (LBAL), thermal bonding (TBAL), and multi-bonding (MBAL), which combines latex and thermal bonding.

[0067] More generally, the stabilizing element may typically have a thickness of at least 50 g / m 2 , preferably at about 50 g / m 2 About 400g / m 2 , especially 80g / m 2 Up to 240g / m 2The average basis weight within a range of 100 nm is calculated by dividing the weight of the stabilizing element by its surface area. The stabilizing element can have a uniform basis weight, a typical characteristic of nonwoven materials. The basis weight of the stabilizing element can also vary locally along the length of the article, for example, the front and middle portions of the layer may have a higher basis weight than the back portion. This is particularly likely when the stabilizing element is composed of loosely bonded fibers, such as cross-linked cellulose fibers. For example, such a stabilizing element can be produced in-line by depositing fibers (e.g., cross-linked cellulose fibers) onto a forming surface within a deposition chamber of variable depth, allowing for localized variation in the basis weight of the deposit. The forming surface of the deposition chamber can be provided with a series of small holes connected to a negative pressure vacuum source, so that suction pulls the fibers into the desired position to form a fibrous layer with the desired morphology and shape. The fibrous layer can be formed or transferred onto a carrier sheet, which should be at least the same size as the fibrous stabilizing element. The carrier sheet can be, for example, a topsheet, another liquid management layer (such as the nonwoven acquisition layer 70), or any other layer of the article (e.g., the corewrap top layer 91).

[0068] The stabilizing element 100 is typically present at least in the middle portion of the article, as embodied by point M defined above. The stabilizing element also extends at least along the longitudinal centerline toward the front end to point C, which is at least 40 mm from the transverse centerline (preferably also toward the rear end of the absorbent article). At point C, the stabilizing element extends no more than 50 mm in width in the transverse direction. The width of the stabilizing element measured at point C is typically in the range of about 20 mm to about 50 mm, and preferably also in the range of about 20 mm to about 50 mm at point M. Research has found that using a narrower stabilizing element can prevent inner thigh compression during walking or other activities while being wide enough to reduce wrinkling (both visually and tactilely) at least in the crotch region of the absorbent article. The stabilizing element 100 typically has a generally rectangular shape, as this shape most efficiently utilizes roll-provided material (such as a nonwoven). Other shapes are also possible, such as hourglass, dogbone, trapezoidal, and the like. When the stabilizing element comprises airlaid fibers, these fibers can be airlaid in a mold having the desired shape. The longitudinal dimension of the stabilizing element 100 measured along the longitudinal centerline is in the range of 100 mm to 500 mm. For adult incontinence pants applications, the length of the stabilizing element may in particular be in the range of 200 mm to 400 mm.

[0069] While the stabilizing element can be a single-layer component to simplify construction (this also includes integrated layers comprising two or more layered structures, such as spunlace layers), it can also be a multilayer component comprising at least two sublayers. These sublayers can be stacked as separate layers, or they can be formed by folding a single layer of material, with the folds forming the sublayers. The sublayers can be arranged so that the stabilizing element has a higher basis weight in the longitudinally extending central region than in the lateral regions disposed laterally outward from this central region. In this way, the stabilizing element provides increased stability in this central region of the article, where stability is most needed. This can be achieved by stacking at least two sublayers of different widths. The two vertically adjacent sublayers forming the stabilizing element can be uniformly attached to each other at their interface, or attached according to a specific attachment pattern that includes a longitudinally extending central attachment zone, but no attachment in the lateral non-attachment zones disposed laterally outward from this central attachment zone. When the stabilizing element is composed of two or more layers, each layer should not exceed 50 mm in width. Additionally, the combined total basis weight of two or more layers is preferably greater than 50 gsm, and individual layers may have lower basis weights.

[0070] Absorbent core 26

[0071] The absorbent core 26 may be a unitary component comprising a layer of absorbent material 72 that provides absorbent capacity to the absorbent article and is sandwiched between a core wrap bottom layer 92 and a core wrap top layer 91 .

[0072] The absorbent material layer 72 may include or consist of superabsorbent polymer (SAP) particles. SAP is a water-insoluble but water-swellable polymer capable of absorbing large amounts of fluid. The term "superabsorbent polymer" as used herein refers to an absorbent material capable of absorbing at least 10 times its own weight in a 0.9% saline solution as measured by the Centrifuge Retention Capacity (CRC) test specified in EDANA method WSP 241.2.R2 (19). The SAP may specifically have a CRC value of greater than 20 g / g, or greater than 24 g / g, or from 20 g / g to 50 g / g, or from 20 g / g to 40 g / g, or from 24 g / g to 35 g / g. The SAP may be a cross-linked polyacrylate, or other types of polymers known in the art.

[0073] The absorbent material may comprise superabsorbent polymer particles mixed with cellulose fibers (as known in fluff pulp cores) or may be free of cellulose fibers (as known in fluff-free cores). The absorbent material advantageously comprises a high proportion of SAP. The absorbent material may specifically comprise at least 70%, in particular at least 80%, or at least 90% or even up to 100% SAP by weight of the absorbent material. The resulting absorbent core containing a high proportion of SAP generally has a reduced thickness in the dry state compared to conventional absorbent cores containing cellulose fibers as absorbent material. The reduced thickness contributes to improved fit and wearing comfort of the absorbent article. The absorbent material layer in the present invention may be free of cellulose fibers. The absorbent core may comprise at least one layer of SAP which is not mixed with cellulose fibers.

[0074] The absorbent material layer 72 may optionally include at least one channel-forming region (not shown). A channel-forming region is an area within the absorbent material layer that is intentionally left empty and contains no absorbent material, except for particles that may be accidentally deposited during the manufacture of the core. The channel-forming region preferably does not extend to either side of the absorbent material layer so that it is completely surrounded by the absorbent material. The channel-forming region is typically elongated in the longitudinal direction, with its longitudinal length being 20% ​​to 80%, or 20% to 70%, or 30% to 60% of the longitudinal length of the absorbent material layer (longitudinal length means the length measured as projected onto the longitudinal centerline). The absorbent core may include a pair of channel-forming regions symmetrically arranged on either side of the longitudinal centerline 2, wherein these channel-forming regions may be linear, curved, or a combination of the two. Such a pair of channel-forming regions may be a disconnected structure, but alternatively, these channel-forming regions may also be connected, for example at one or both ends, to form a U-shaped or O-shaped structure. Examples of channel-forming regions are disclosed in more detail in, for example, WO2012170778A1, WO2012170781 (Kreuzer et al.).

[0075] The absorbent material layer 72 may advantageously contain a high proportion of SAP. Various absorbent core designs have been proposed that contain a high proportion of SAP as the absorbent material, see, for example, US Pat. No. 5,599,335 (Goldman), EP Pat. No. 1,447,066 (Busam), WO 95 / 11652 (Tanzer), US Pat. No. 2008 / 0312622 Al (Hundorf), and WO 2012 / 052172 (Van Malderen). In particular, SAP printing techniques such as those disclosed in US Pat. No. 2006 / 024433 (Blessing), US Pat. No. 2008 / 0312617, and US Pat. No. 2010 / 0051166 Al (both to Hundorf et al.) may be used.

[0076] The absorbent material layer is typically deposited on a substrate that is part of the absorbent core, such as the core wrap bottom layer 92 or the core wrap top layer 91. In a SAP printing method as described in US 2008 / 312,622 A1 (Hundorf), a continuous SAP layer is obtained by depositing SAP on each core wrap layer in a pattern such that the absorbent material landing areas are separated by land areas that do not contain absorbent material. The absorbent material landing areas of the first layer substantially correspond to the land areas that do not contain absorbent material of the second layer, or vice versa, the land areas that do not contain absorbent material of the first layer substantially correspond to the absorbent material landing areas of the second layer, so that a continuous layer of SAP is obtained when the two discontinuous layers are combined.

[0077] The total amount of SAP present in the absorbent core is adapted to the needs of the intended wearer of the article. For adult incontinence products, the amount of SAP in the absorbent core may be, for example, from about 2 g to 50 g, particularly from 5 g to 40 g, and from 10 g to 20 g, for example, for typical adult incontinence products. The average SAP basis weight in the absorbent core may be at least 50 g / m2, 100 g / m2, 200 g / m2, 300 g / m2, 400 g / m2, 500 g / m2 or more, and typically around 200 g / m2. 2 Up to 600g / m 2 , especially 400g / m 2 Up to 525g / m 2 range, as calculated by dividing the total amount of SAP by the absorbent core surface area.

[0078] Core wrap layers 91, 92

[0079] The absorbent core 26 typically includes a core wrap. The core wrap can include a core wrap top layer 91 and a core wrap bottom layer 92 with an absorbent material layer 72 sandwiched between them. The core wrap top layer and the core wrap bottom layer can be made of any material that can accommodate absorbent material and provide support for the absorbent material. The core wrap can be made of a single continuous nonwoven web that is wrapped around the absorbent material layer. These core wrap layers can alternatively be made of independent material webs, such as Figure 3 and Figure 4 These individual layers can be joined, for example, in a C-shaped wrap configuration as shown in these figures. Using different materials for the top and bottom layers of the core wrap can be used to impart different properties to the top and bottom surfaces of the core wrap, in particular, the top layer 91 can be more hydrophilic than the bottom layer 92.

[0080] The basis weight of these core wrap layers is typically evenly distributed across the length and width of the core wrap layer (i.e., each layer has uniformity in both the machine direction and the cross-machine direction). The basis weight value of the material is typically provided by the supplier, but if not, it can be calculated by dividing the weight of the layer by its surface area. A typical core wrap layer is typically a low basis weight nonwoven (typically less than 20 g / m 2 , especially at 8g / m 2 Up to 14g / m 2 The core wrap top layer 91 and the core wrap bottom layer 92 may include a nonwoven layer, or be composed of a nonwoven layer. The nonwoven layer may be any type of conventional nonwoven. SMS nonwovens (spunbond-meltblown-spunbond laminates) are commonly used in the art. For example, carded nonwovens (made from short fibers) are suitable. As is known in the art, carded nonwovens can be processed using hydraulic entanglement (hydroentanglement), thermal calendering, or hot air bonding. The nonwoven layer may also be a spunbond or meltblown nonwoven web (made from long fibers), or a nonwoven having a spunbond layer and a meltblown layer (e.g., SMS, SMMS, SMSS, etc.).

[0081] The absorbent article 10 may optionally include an acquisition layer 70 positioned just below the topsheet to quickly conduct fluid away from the topsheet, such as Figure 3 As shown. In the case of a pant-type article comprising an absorbent pad assembly 50, the acquisition layer 70 is part of the absorbent pad assembly. Any typical acquisition layer known in the art may be used, such as a surfactant-treated nonwoven acquisition layer. Such an acquisition layer typically has a basis weight of 20 g / m 2 Up to 70g / m 2 range, especially 30g / m 2 Up to 60g / m 2 The acquisition layer may be a latex bonded nonwoven, an air-through bonded nonwoven, or any other conventional acquisition layer known in the art.

[0082] Such an acquisition layer 70 can provide sufficient fluid handling properties so that a conventional low basis weight core wrap material can be employed as the core wrap top layer 91. Thus, the core wrap top layer 91 can be selected from a material having relatively high fluid acquisition properties. Typical low basis weight core wrap top layer nonwovens can contain a hydrophilic agent, particularly when the core wrap top layer comprises or consists entirely of inherently hydrophobic synthetic fibers. The hydrophilic agent can be provided using any conventional hydrophilic treatment. Typically, fiber webs such as nonwovens can be externally coated with a surfactant, either directly or via an oil / emulsion. Alternatively, a hydrophilic melt additive can be added to the polymer melt used to prepare the fibers, as is known in the art. A hydrophilic melt additive is an amphiphilic molecule having a hydrophilic head and a hydrophobic tail. The hydrophilic head is oriented toward the surface of the adhesive, thereby providing the hydrophilic properties of the adhesive, while the hydrophobic head remains in the polymer matrix.

[0083] Alternatively, the absorbent article of the present invention may be free of such an acquisition layer, e.g. Figure 4 This design may be particularly useful when the stabilizing element 100 and / or the core wrap top layer 91 already at least partially provide fluid acquisition or distribution properties. This design may be particularly useful for light adult incontinence products, which need to handle relatively small amounts of urine per gush, for example, compared to baby diapers.

[0084] Therefore, in Figure 4 In the second embodiment shown, although the width of the stabilizing element is reduced, the acquisition layer 70 can be eliminated or thinned if the stabilizing element 100' and / or the core wrap top layer 91' have sufficient liquid handling properties to compensate for the reduced width of the stabilizing element 100. In order for the core wrap top layer 91' to act as a temporary storage layer for urine for subsequent absorption by the absorbent material layer 72, the basis weight of the core wrap top layer can be relatively high relative to typical prior art core designs. In particular, the basis weight of the core wrap top layer 91' can be about 40 g / m 2 About 200g / m 2 , 60g / m 2 Up to 180g / m 2 or 80g / m 2 Up to 160g / m 2range. Hot air bonded nonwovens generally have high loft properties, which means that their porous structure can provide void volume for absorbing and temporarily storing liquids. At the same time, they provide softness and do not have too high bending stiffness. Similarly, spunlace nonwovens (i.e., made by a hydroentanglement process) can be advantageously used as the core wrap top layer 91 '. Spunlace materials, as disclosed above for the stabilizing element 100, can also be used as the core wrap top layer 91 '. When the absorbent article does not include a separate acquisition layer 70, the core wrap top layer 91 ' can therefore advantageously be made of a material with good acquisition properties (such as a spunlace fabric).

[0085] The core wrap top layer 91' can comprise staple fibers. The staple fibers are preferably processed using a through-air bonding or hydroentanglement (spunlace) process. In addition to hydroentanglement or through-air bonding, the staple fiber nonwoven web can also be subjected to some localized bonding treatment (e.g., point bonding / calendering) using heat and / or pressure, or it can be untreated to introduce localized bond areas where the fibers are melt-bonded to each other.

[0086] Through-air bonding refers to a process in which staple or continuous fibers are bonded by forcing air through a nonwoven web, wherein the air is hot enough to melt the polymer of the fibers (or at least partially melt it, or melt it to a state where the fiber surfaces become sufficiently tacky), or, if the fibers are multicomponent fibers, wherein the air is hot enough to melt one of the polymers from which the fibers of the nonwoven web are made (or at least partially melt it, or melt it to a state where the fiber surfaces become sufficiently tacky). Air velocities are typically between 30 m / min and 90 m / min, and residence times can be as long as 6 seconds. The melting and resolidification of the polymers provide the bonds between the different fibers. The hot air melts the staple or continuous fibers, or, in the case of multicomponent fibers, the lower-melting-point polymer component of the fibers, thereby forming bonds between the staple fibers to consolidate and integrate the staple fiber layers into a web.

[0087] The core wrap top layer 91 ' can comprise multicomponent fibers. The multicomponent fibers can be bicomponent fibers, such as core-skin type or side-by-side bicomponent fibers. The core wrap top layer 91 ' can also comprise unicomponent fibers. The fiber of this nonwoven can comprise a unicomponent fiber having a gross weight based on this nonwoven of at least 30 wt %, at least 40 wt %, at least 50 wt %, at least 70 wt %, at least 90 wt % or 100 wt %. The nonwoven web that the core wrap top layer comprises or forms this core wrap top layer can comprise a mixture of unicomponent fibers and multicomponent fibers.

[0088] In general, fiber decitex (related to the fiber diameter) directly affects the pore size of the material and therefore, in particular, the capillary pressure and permeability / saturation and moisture permeability of the material. At a given basis weight, the lower the decitex, the lower the permeability and the higher the capillary pressure. The core wrap top layer 91, 91 ' can contain at least 50%, at least 70%, or at least 80%, or even up to 100% by weight of fibers having a denier value below 10 decitex.

[0089] Generally speaking, the core wrap top layer and bottom layer are preferably bonded longitudinally by one or more longitudinal core wrap bonding lines 93, to prevent absorbent material from escaping laterally from the absorbent cores.These core wrap layers also can be optionally bonded transversely by one or more transverse core wrap bonding lines at the front and back sides of the absorbent cores.These core wrap layers can be bonded face to face, at least longitudinally bonded as shown in the figure, or adopt C type to wrap configuration.The core wrap bottom layer 92 can be wider than the core wrap top layer 91, so that the wing formed by the core wrap bottom layer can be as shown in FIG. Figures 3 and 4 As shown folded around the absorbent material and attached to the core wrap layer. Although the reverse configuration is possible, as shown Figure 4 As shown, when the core wrap top layer has a higher basis weight than the core wrap bottom layer, C-wrapping with the core wrap bottom layer 92 can help reduce the amount of higher basis weight material used, thereby reducing the amount of more expensive core wrap top layer material 91' used.

[0090] The core wrap top layer 91 , 91 ' and the core wrap bottom layer 92 typically at least partially or completely surround the absorbent material layer 72, thereby achieving both dry and wet immobilization of the absorbent material.

[0091] The absorbent core may include one or more adhesive layers, specifically an auxiliary adhesive layer 94 applied between the inner surface of one or both of the core wrap layers and the SAP layer, which secures the SAP to the core wrap by adhesive means. Additionally, the SAP layer may be at least partially secured to the core wrap top layer and / or the core wrap bottom layer by a thermoplastic fiber network applied to the SAP layer. For simplicity, these adhesives are not shown in the accompanying drawings.

[0092] The core wrap top layer 91 and the core wrap bottom layer 92 are preferably bonded to each other along at least part of the length of the core channel forming areas (if these core channel forming areas are present, they are not shown in the figure). This bond provides structural integrity of the channels in both dry and wet states. Any known bonding technique known in the art can be used to provide this bond, in particular techniques selected from adhesive bonding, thermal bonding, mechanical bonding, ultrasonic bonding, or any combination thereof. The adhesive can be applied, for example, to the inside of the top side and / or bottom side of the core wrap in the channel areas, typically by slit gluing or any other method, followed by applying pressure in the channel areas to provide a good adhesive bond in these areas. Exemplary patent disclosures of such adhesive bonding processes can be found in WO 2012 / 170798 Al (Jackels et al.), EP 2,905,000 (Jackels et al.), and EP 2,905,001 (Armstrong-Ostle et al.) for airfelt or absorbent cores without airfelt.

[0093] Other bonds such as thermal, mechanical, and ultrasonic bonds may also be used as additional or alternative bonds. For example, the adhesive bond may be reinforced by thermal, mechanical, or ultrasonic bonds. Such thermal, mechanical, or ultrasonic bonds may be applied to the passages extending through the outside of the core wrap layer.

[0094] Other components

[0095] The absorbent pad assembly 50 typically includes a pair of longitudinally extending barrier leg cuffs 80, each of which is disposed on a longitudinal side of the absorbent pad assembly. The barrier leg cuffs 80 each include a proximal portion 82 attached to the absorbent pad assembly, for example, via adhesive 69, and a respective free edge 84 that can extend away from the assembly toward the wearer. The barrier leg cuffs advantageously include elastic members 86 disposed along the free edges 84. As is known in the art, the barrier cuff edge elastic members 86 longitudinally tension the free edges 84 when the absorbent pad assembly is bent to conform to the body in the crotch region of the wearer. The barrier cuff edge elastic members 86 can be incorporated into the cuff structure in a pre-strained state, which causes the free edges to be longitudinally tensioned and tend to gather, thereby causing the free edges to extend away from the assembly when the pants are worn and to conform to the curves of the wearer's body.

[0096] Barrier leg cuffs can be formed from a highly liquid-impermeable material, such as a film or a breathable but highly liquid-impermeable nonwoven web, and can be used to trap urine within the panty before it is absorbed by the absorbent structure. The absorbent article may also optionally include an outer cuff, also known as a gasketing cuff, which is provided by pre-strained elastic strands positioned on the outer longitudinal edges of the absorbent assembly (this double-cuff construction is not shown in the figures). The outer cuffs gather the left and right longitudinal edges of the assembly along the wearer's legs toward the crotch region, thereby enhancing leak protection and improving the fit. Longitudinal edge elastic members can be positioned between the material of the barrier cuff 80 and the material of the topsheet 60. Alternatively, these members can be positioned between the topsheet and backsheet, or outside the outward-facing side of the backsheet. However, external barrier cuffs typically increase the width of the absorbent assembly. In the present invention, it has been found that the external barrier cuffs can be omitted. Therefore, the article of the present invention may be free of external barrier cuffs. Specifically, the absorbent assembly may include barrier leg cuffs 80 (inner cuffs) as described above, but may be free of external barrier cuffs.

[0097] The barrier cuff elastic members 86 are typically elastic strands that may be of the same or different material than the elastic strands 40 in the panels 20, 30. One, two, or more such elastic strands 86 may be disposed at the folds of the cuff material. The barrier cuffs and associated longitudinal edge structures and elastic members may also be formed of materials and configured as described, for example, in any of the following: US 8,939,957; US 2016 / 270978; US 2016 / 270971; US ​​2016 / 270980; US 2016 / 270985; US 2016 / 270983; US 2016 / 270979; US 2016 / 270975; US 2016 / 270981; and US 2016 / 270973.

[0098] Relationships between layers and manufacturing methods

[0099] The components can be converted into absorbent articles according to processes known in the art. Typically, adjacent layers will be joined together using conventional bonding methods, such as adhesive coatings applied via slot coating or spraying over the entire surface or a portion of the surface of the layer, or heat bonding, or pressure bonding, or a combination thereof. For purposes of clarity and readability, not all bonding structures between the components are shown in the drawings. Unless specifically excluded, bonding between the layers of the article should be considered to be present. Adhesives can generally be used to improve adhesion between different layers, such as between a backsheet and a core wrap. The adhesive used can be any standard hot melt adhesive as known in the art. For example, Figure 3As shown, construction adhesives 96, 97 may be applied between the topsheet 60 and the acquisition layer 70, and between the acquisition layer 70 and the stabilizing element 100, respectively, for example by slot coating. Figure 4 As shown, in the absence of a separate acquisition layer 70 between the topsheet and the absorbent core, the stabilizing elements 100' can be attached directly to the topsheet by slot-coating adhesive 98. The stabilizing elements 100, 100' can also be adhered to the core wrap top layer 91 by adhesive 99. Typically, adhesive 95 is applied to the inwardly facing side of the backsheet 66 (e.g., by spiral coating) to secure the components (absorbent core, topsheet, and barrier leg cuffs) directly to the backsheet.

[0100] packaging

[0101] A plurality of articles according to the present invention are usually packaged together for transportation and sale. The articles can be folded and packaged, as known in the art. The package can be, for example, a plastic bag or a cardboard box. Disposable absorbent pants can be folded in half along the transverse center line usually, and the side panels can be folded inward before being packaged. Absorbent articles can be piled up under compression to reduce the size of the package while still providing a sufficient number of absorbent articles for each package. By packaging the absorbent articles under compression, caregivers can easily handle and store the packages, and, due to the size of the packages, also provide manufacturers with savings in distribution and inventory. Standard packaging can usually contain 8 to 40 articles, but other quantity specifications are certainly also feasible, for example, independently packaged articles can also be provided.

[0102] Recycling-friendly and bio-based absorbent products

[0103] The components of the absorbent articles described herein can be recycled for other uses, regardless of whether they are (at least partially) formed from recyclable materials. Examples of absorbent article materials that can be recycled are nonwovens, films, fluff pulp, and superabsorbent polymers. The recycling process can use an autoclave to sterilize the absorbent article, which can then be shredded and separated into different by-product streams. Example by-product streams can include plastics, superabsorbent polymers, and cellulose fibers, such as pulp. These by-product streams can be used to produce fertilizers, manufacture plastic products, paper products, viscose, building materials, absorbent pads for pets or hospital beds, and / or other uses. More details about absorbent articles that facilitate recycling, the design of recycling-friendly diapers, and the design of recycling-friendly and bio-based component diapers are disclosed in US2019 / 0192723, published on June 27, 2019.

[0104] Example

[0105] First type of embodiment

[0106] Example 1 (code GD) is an adult incontinence pants according to the present invention, which is roughly as follows Figures 1 to 3 As shown. Dimensions are indicated in width x length format. This Example 1 includes a 90 mm x 305 mm latex bonded acquisition layer (70), and a 40 mm x 305 mm stabilizing element (100) comprised of cross-linked cellulose fibers and having a basis weight of 144 g / m 2 The core is a fluff-free absorbent core containing 16.3g SAP (the absorbent layer size is 120mm×400mm). The top layer of the core wrap is 130mm wide and 55g / m 2 The spunlace fabric is a homogenized composition consisting of 20% viscose fiber (1.3 dtex), 30% hollow spiral PET fiber (10 dtex) and 50% PE / PET fiber (core-skin composite fiber, 2.2 dtex). The core wrap bottom layer is 165 mm wide and 10 g / m 2 The overall size of the core bag is 120mm×430mm.

[0107] Example 2 (Comparative Example, Code JD) is Always ® Discreet Underwear Max S / M, the cross-linked cellulose layer is 55mm wide.

[0108] Example 3 (Comparative Example, code H) is Depend ® Fit Flex Maxi Small.

[0109] The thickness measurements of the above-listed articles were performed according to the "Width and Thickness Measurement Method" disclosed herein, and the measurement results are recorded in Table 1 below.

[0110] Table 1: Thickness measurement results

[0111]

[0112] Under CDA conditions, testers were asked to test 10 pairs of incontinence pants from each group. The pants were randomized using a round-robin generator. Each tester completed a diary card for each product, weighed the product after use, and completed a coded online questionnaire. The results are summarized in Tables 2-3 below.

[0113] Table 2: Diary card data

[0114]

[0115] Table 3: Questionnaire data

[0116] Rating scale 1-5 (poor, fair, good, very good, excellent)

[0117]

[0118] According to the diary card, compared with the currently commercially available control product (Example 2, code JD), Example 1 of the present invention reduces the basis weight and width of the cross-linked cellulose layer without causing a negative impact on the leakage prevention performance.

[0119] Field testing has shown that the present invention's products and currently available products have significantly less sagging in the crotch area than the control product, and also offer a better fit in the crotch area. Furthermore, the present invention's products also exhibit significantly better wrinkle accumulation between the legs than the control product.

[0120] Second type of embodiment

[0121] Example 4 (code T) is roughly as follows Figure 4 The handmade absorbent pants shown. The absorbent core (26) is a fluff-free absorbent core, including 40g / m 2 The top layer of the spunlace core wrap.

[0122] Stabilizing element (100) is 135 g / m 2 Spunlace fabric, 40mm wide, consists of two integrated layer structures:

[0123] Layer 1 (top layer structure) :

[0124] 50% hollow spiral PET fiber (10 dtex)

[0125] 50% PE / PET fiber (core-sheath composite fiber, 5.8 dtex)

[0126] Layer 2 (bottom layer structure) :

[0127] 50% viscose (1.3 dtex)

[0128] 50% PE / PET fiber (core-sheath composite fiber, 5.8 dtex)

[0129] No other acquisition or distribution layers were used in this embodiment. The chassis was a single cuff chassis (no external barrier cuff).

[0130] The construction of Example 5 (code L) is substantially the same as that of Example 4, except that a 90 mm wide spunlace fabric is used instead of a 40 mm wide narrow stabilizing element.

[0131] Example 6 (code C) is the commercially available Always ® Discreet adult incontinence products have a fluff pulp core, a double-layer acquisition-distribution layer (70mm wide, 43g / m 2 The collection layer and 200g / m 2This is the same product designated JD as in the first embodiment described above.

[0132] The differences between the products tested in this series are summarized in the table below:

[0133] Table 4: Test product description

[0134]

[0135] The thickness of the products listed in the above examples was measured according to the “Width and Thickness Measurement Method” disclosed herein, and the results are recorded as follows.

[0136] Table 5: Thickness measurement results

[0137]

[0138] Under CDA conditions, 45 reviewers evaluated nine products from each of the three codenames. The order of product use was randomly assigned to each reviewer in a balanced manner across six rotating combinations. Reviewers completed diary cards for each product and completed an online questionnaire after each codename cycle. The results are summarized in Tables 6-7 below.

[0139] Table 6: Questionnaire data

[0140] Rating scale 1-5 (poor, fair, good, very good, excellent)

[0141]

[0142] Table 7: Diary card data

[0143] (Percentage of affirmative answers)

[0144]

[0145] Code T, with its narrow stabilizing element, demonstrated significant advantages over Code L and Code C (control) in the areas of comfort, concealment, and fit relevant to the problem. Code L also demonstrated advantages over the control in these same areas, but to a lesser extent.

[0146] The third embodiment

[0147] Example 7 (code S) is an adult incontinence pants according to the present invention, which is roughly as follows Figures 1 to 3 As shown. This embodiment includes a double layer of 110gsm, 90mm×325mm spunlace fabric as the acquisition layer (70). The top layer of the 110gsm spunlace fabric is about 36gsm and its composition (by weight) is as follows:

[0148] 30% 1.3 dtex CV

[0149] 30% 4.4 dtex PET / CoPET

[0150] 40% 10dtex PET HS

[0151] The bottom layer of the 110 gsm spunlace fabric is approximately 74 gsm and has the following composition (by weight):

[0152] 80% 1.3 dtex CV

[0153] 20% 10dtex PET HS

[0154] Example 7 also includes a 135gsm, 40mm x 325mm MBAL (Multiple Bonded Airlaid) ribbon mosaic structure as a stabilizing element (100). The core wrap consists of two layers of 10g / m 2 The absorbent core is composed of an SMS nonwoven of , thereby defining a core wrap having an overall dimension of 120 mm x 480 mm. The absorbent core is a fluff-free pulp core, fixed by bonding, and contains 16.3 g of SAP.

[0155] Comparative Example 8 (code L) is the commercially available Always ® Discreet Boutique Underwear Max S / MMauve. The topsheet and absorbent core had the same construction as Example 7, but this comparative article included outer leg cuffs (OLCs), whereas Inventive Example 2 did not.

[0156] Under CDA conditions, 40 evaluators were allowed to use five products per group, replacing their daily items. Evaluators were required to complete a diary card and weigh the products after use, and complete an online questionnaire after each code cycle. The results of the questionnaire and diary are shown in Tables 8 and 9 below.

[0157] Table 8: Questionnaire data

[0158] Rating scale 1-5 (poor, fair, good, very good, excellent)

[0159]

[0160] Table 9: Diary card data

[0161] (Percentage of affirmative answers)

[0162]

[0163] The stabilizing element (in this form, a 135gsm mosaic MBAL material) excels in both actual and perceived protection, as well as fit. In the thin / flexible core design of this invention, the single-cuff chassis, comprised of barrier leg cuffs (inner cuffs), demonstrates even greater performance advantages. With the single-cuff chassis, crotch and leg fit metrics are significantly improved.

[0164] Thickness measurement of commercial products

[0165] Thickness measurements of commercial products were performed according to the "Width and Thickness Measurement Method" disclosed below. The results are reported in Table 10 below.

[0166] Table 10

[0167]

[0168] Test Method

[0169] Width and thickness measurement methods

[0170] equipment :

[0171] ●Ono-Sokki GS-503 linear caliper with Ono-Sokki DG-3610 digital scale, or equivalent accuracy equipment.

[0172] ●Flat presser foot with a diameter of 10.1mm.

[0173] ●Without applying any additional load to the mechanism, the pressure generated is equal to 0.45 psi (3.103 kPa).

[0174] Sample preparation and width measurement :

[0175] ● For each product variant, 10 parallel samples were prepared and measured according to the following procedure.

[0176] ●For trouser-type products, cut the side seams (13).

[0177] ● Record the position of the front edge (11) and the back edge (12) of the product, and the distribution of any crease lines (usually there may be one crease line along the transverse center line (4) because the product is usually folded in the middle when packaged).

[0178] ●Fix the front edge (11) of the product to the test bench with adhesive tape. After the rear edge (12) of the product is stretched longitudinally until it is flat and taut, fix it to the test bench with adhesive tape.

[0179] ●The length of the product is measured along the longitudinal center line from the midpoint of the front edge of the product to the midpoint of the rear longitudinal edge of the product.

[0180] ● Mark the longitudinal midpoint (M) on the body-facing (top sheet) side of the product at the longitudinal centerline (i.e., a distance equal to half the length of the product, measured from the front edge (12) of the product).

[0181] ●Then test an area of ​​the product extending 60 mm from the longitudinal midpoint M toward the front waist edge. If a horizontal line can be drawn 40 mm in front of the transverse centerline that is free of residual creases and wrinkles, draw that line and define it as L1. If the line at 40 mm would significantly overlap with residual creases and wrinkles, perform a second test of the area extending 60 mm in front of the longitudinal midpoint (M), and draw line L1 within that area to minimize overlap with any residual creases and wrinkles. If there are multiple possible positions for line L1 that would equally minimize overlap with residual creases and wrinkles, the position closest to 40 mm in front of the longitudinal midpoint (M) is preferred. For products without a distinct front and back edge (for example, because they are symmetrical about the transverse centerline), measure each sample twice in each direction using the above method, and average the measured values.

[0182] A transverse midpoint "C" is marked on line L1, which is centered across the width of the absorbent material layer (72). Point C generally coincides with the longitudinal centerline, but due to tracking deviations in actual production, point C may be offset by several millimeters to the left or right of the centerline. Therefore, point C coincides with the center of the absorbent material layer (72) on line L1. Point C is the location where the center thickness of the product will be measured.

[0183] Along line L1, mark two additional marks ("R" and "L") on the body-facing (topsheet) side of the product. Mark "R" is placed 30 mm from the transverse midpoint C, toward the right lateral edge of the product. Mark "L" is placed 30 mm from the lateral midpoint C, toward the left lateral edge of the product. It should be noted that the definition of "right" and "left" sides of the product is based on the body's orientation when worn. Marks "R" and "L" indicate where the right and left pad thicknesses will be measured.

[0184] ● Measure the width W2 of the stabilizing element (100) at line L1 (i.e. the distance from one lateral edge to the other) and record it accurately to 0.1 mm. Use a light box (see Figure 5 ) can more easily measure the width because the light box can more effectively distinguish the absorbent material layer (72) from other components of the article (such as the top sheet or core wrap).

[0185] Measure the width W1 of the absorbent material layer (72) at line L1 (i.e. the distance from one lateral edge of the absorbent material layer to the other lateral edge) and record it to the nearest 0.1 mm. If an acquisition layer (70) is present, the width of the acquisition layer may also be recorded in a similar manner.

[0186] ●Remove the fixing tapes at both ends of the product to loosen it from the laboratory bench.

[0187] ● Use scissors to cut the front piece (20) and the back piece (30) and the leg elastic components (86) away from the outer periphery of the core / core bag, taking care to avoid damaging any part of the core / core bag during the operation.

[0188] Thickness Measurement Procedure :

[0189] ●Align measuring point "C" with the center position directly below the presser foot and slowly lower the presser foot until it touches the top side of the product.

[0190] After the presser foot maintains contact with the product for 30 seconds, accurately record the thickness to 0.01mm and mark the test position.

[0191] ● Repeat the above steps for the “R” and “L” positions using the same operating specifications.

[0192] • Repeat the complete measurement procedure for all 10 replicates.

[0193] result :

[0194] ●The recorded value at each test position is the arithmetic mean of ten independent recorded measurement results, where: width W1 and width W2 are accurate to 0.1mm, and the center pad thickness (C1), right pad thickness (C2) and left pad thickness (C3) are accurate to 0.01mm.

[0195] Miscellaneous

[0196] The dimensions and values ​​disclosed herein should not be understood as being strictly limited to the exact numerical values ​​recited. Instead, unless otherwise specified, each such dimension is intended to mean both the recited value and a functionally equivalent range encompassing that value. For example, a dimension disclosed as "40 mm" is intended to mean "about 40 mm."

[0197] Unless expressly excluded or otherwise limited, each document cited herein, including any cross-referenced or related patent or patent application and any patent application or patent to which this application claims priority or the benefit of, is hereby incorporated by reference in its entirety. The citation of any document is not an admission that it is prior art to any of the present inventions disclosed or claimed herein, or an admission that it, by itself or in combination with any one or more references, proposes, suggests, or discloses any such invention. Further, to the extent that any meaning or definition of a term in this document conflicts with any meaning or definition of the same term in a document incorporated by reference, the meaning or definition assigned to that term in this document shall govern.

[0198] Although specific embodiments of the present invention have been illustrated and described, it will be apparent to those skilled in the art that various other changes and modifications may be made without departing from the spirit and scope of the invention. It is therefore intended that all such changes and modifications within the scope of the invention be encompassed in the appended claims.

Claims

1. An absorbent article comprising: a longitudinal centerline extending longitudinally and dividing the absorbent article into left and right halves; a transverse centerline extending in a transverse direction perpendicular to the longitudinal direction and dividing the absorbent article into a front half and a back half, wherein the absorbent article comprises: a liquid permeable topsheet; Liquid-impermeable backsheet; an absorbent core comprising a layer of absorbent material; and Stabilizing elements; wherein the stabilizing element and the absorbent core are disposed between the topsheet and the backsheet; wherein the stabilizing element and the absorbent core overlap at least at point C, wherein point C is located about 40 mm from the transverse centerline toward the front end of the article and is laterally aligned with the absorbent material layer, and The width (W2) of the stabilizing element does not exceed 50 mm, and the width is measured at the point C according to the "Width and Thickness Measurement Method" described herein.

2. The absorbent article according to claim 1, wherein the width (W2) of the stabilizing element is in the range of 20 mm to 50 mm.

3. The absorbent article according to claim 1, wherein the absorbent core extends at least to point R and point L in the transverse direction, wherein point R and point L are respectively arranged 30 mm to the right and left of point C in the transverse direction. The stabilizing element does not extend to at least any position of the R point and the L point in the transverse direction. wherein the absorbent article has a first thickness C1 at the point C, and wherein the absorbent article has a second thickness C2 at the point R, and a third thickness C3 at the point L, and wherein the thickness ratio C1 / (C2+C3) is at least 0.6, and the thicknesses are all measured according to the "Width and Thickness Measurement Method" disclosed herein.

4. The absorbent article according to claim 3, wherein the thickness C1 is less than 5.0 mm and the average value (C2+C3) / 2 is less than 4.5 mm.

5. The absorbent article of claim 1 , wherein the stabilizing element has a viscosity of at least 50 g / m 2 The average basis weight of 6. The absorbent article of claim 1 , wherein the stabilizing element comprises a material selected from the group consisting of: cross-linked cellulose fibers; or Nonwovens, especially spunlace; or Airlaid material.

7. The absorbent article of claim 1, wherein the stabilizing element is positioned between the topsheet and the absorbent core.

8. The absorbent article of claim 1 , wherein the absorbent article further comprises an acquisition layer between the topsheet and the stabilizing element, wherein the acquisition layer has a basis weight of 20 g / m 2 Up to 70g / m 2 range, and the width of the acquisition layer at the point C is greater than 50 mm, and the width is measured according to the "width and thickness measurement method" described in this article.

9. An absorbent article according to claim 1, wherein the absorbent core comprises a core wrap, wherein the core wrap has a top layer and a bottom layer, and the absorbent material layer is arranged between the top layer of the core wrap and the bottom layer of the core wrap, and wherein the top layer of the core wrap and the bottom layer of the core wrap are independent layers, and the independent layers are longitudinally bonded by one or more longitudinal core wrap bonding lines.

10. The absorbent article of claim 1 , wherein the width (W1) of the absorbent material layer is in the range of 70 mm to 150 mm, as measured according to the Width and Thickness Measurement Method described herein, and the ratio of W1 divided by W2 is at least 1.

5.

11. The absorbent article of claim 1 , wherein the absorbent core comprises at least 10 g of superabsorbent polymer.

12. The absorbent article of claim 1, wherein the absorbent material comprises 80% to 100% by weight superabsorbent particles.

13. The absorbent article of claim 1, wherein the stabilizing element has a length measured in the longitudinal direction in the range of 100 mm to 500 mm.

14. The absorbent article of claim 1 , wherein the absorbent core comprises a hydroentangled core wrap top layer, and wherein the hydroentangled core wrap top layer has a basis weight of about 40 g / m 2 About 200g / m 2 within the range.

15. The absorbent article of claim 1 , wherein the absorbent article is an adult incontinence pant, the adult incontinence pant comprising a front panel, a back panel, and an absorbent pad assembly, wherein the front panel and the back panel are joined to one another along a left side seam and a right side seam, the absorbent pad assembly extending between the front panel and the back panel, wherein the topsheet, the backsheet, and the absorbent core are contained within the absorbent pad assembly, the incontinence pant comprising a barrier leg cuff at each longitudinal edge of the absorbent pad assembly, each barrier leg cuff comprising: Attached to the proximal edge of the topsheet, and free edges capable of standing upwardly away from the topsheet, wherein each free upstanding edge preferably comprises an elastic member, and optionally wherein the article is free of external barrier cuffs.

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