Patent Application
20210251818
The present invention relates generally to the field of wearable absorbent articles having absorbent inserts and reusable outer covers, and more particularly, to fastening systems for such absorbent articles.
It has long been known that absorbent articles (e.g., diapers, adult incontinence articles, feminine hygiene pads) offer the benefit of receiving and containing urine and/or other bodily exudates (e.g., feces, menses, mixture of feces and urine, mixture of menses and urine, etc.).
Absorbent articles may be made of reusable materials, which offers the advantage of utilizing raw materials from renewable and recyclable resources and less waste. However, reusable absorbent articles present difficulties relating to sanitation needs, in handling, laundering and effectively sanitizing soiled diapers for re-use. Further, reusable cloth diapers may be relatively unreliable and leak and may promote over-hydration of the wearer's skin causing diaper rash.
On the other hand, absorbent articles may be fully disposable, increasing consumer convenience by eliminating the need for laundering. Further, many current disposable absorbent articles have structures that make them relatively more effective at containing exudates and conveying and storing liquid exudates away from the wearer's skin. Some have features that enable them to “breathe”, thereby reducing humidity inside the diaper, and some even include skin care compositions that are transferred to the skin when the diaper is worn. Although disposable conventional absorbent articles have many benefits, there is a continuous desire to reduce disposable material consumption and further improve consumer acceptance of single use products.
To address the foregoing concerns, it has been proposed to manufacture two-piece absorbent articles with a reusable outer cover and a detachable absorbent insert that may be reusable or disposable. In this way, the insert can be made with different materials to enhance performance and less energy may be consumed as the insert can be separately laundered. Further, where disposable, the inserts may be made with materials known to provide even more superior performance while minimizing the amount of waste as the whole article need not be disposed. Despite several designs of a two-piece absorbent article, the designs still present some disadvantages. In particular, articles may not provide sufficient attachment between the insert and outer cover to ensure a snug and comfortable fit. Further, known constructions utilize additional materials (e.g., adhesive) which increase manufacturing costs and may be less, or perceived to be less, environmentally friendly. Other constructions utilize buttons, slot/loops, or other fastening systems which may reduce the amount of material used but often do not permit easy or suitable adjustments for the wearer, may not retain fit after loading of the article and/or create complexity in article manufacturing. In addition, known constructions are limited in their ability to provide different fastening properties (e.g., greater peel strength) in different areas of the fastening system.
Thus, there is an ongoing need for a two-piece absorbent article that requires less material and can be made without undesirable complexity. Further, there is a need for a two-piece absorbent article that maintains desired fit during wear and after loading. There is also a need to provide targeted fastening zones in a cost efficient manner
The present invention comprises the features of the independent claims herein. An absorbent article comprises an absorbent insert, an outer cover, and a fastening system. The fastening system comprises a fastening component and a receiving component operative engageable with the fastening component. The receiving component is disposed on a surface of one of the absorbent insert or the outer cover, the surface comprising a surface area. The fastening component is disposed on another of the absorbent insert or outer cover. The receiving component covers at least 50% of the surface area.
An absorbent article comprises an absorbent insert and an outer cover. The absorbent insert comprises a topsheet, a backsheet, and an absorbent core disposed between the topsheet and backsheet; a longitudinal axis and a lateral axis; and a first longitudinal edge and a second longitudinal edge, and a width in a lateral direction extending between the first and second longitudinal edges. The absorbent insert also comprises a fastening component disposed on a garment-facing surface and comprising integrally formed hooks; and an absorbent capacity of at least 120 g. The outer cover comprises a receiving component on a wearer-facing surface and operatively engageable with the fastening component.
An absorbent article comprises an absorbent insert, an outer cover and a fastening system. The absorbent insert comprises a topsheet, a backsheet, and an absorbent core disposed between the topsheet and backsheet. The fastening system comprises a fastening component and a receiving component, the fastening and receiving components being operatively engageable to join the absorbent insert to the outer cover or to enclose the absorbent insert within the outer cover, wherein the fastening component comprises a first macro pattern of fastening elements and a second macro pattern of fastening elements, wherein the first and second macro patterns differ by design element, surface area, opacity, color, average size of fastening elements within an array, average spacing of fastening elements within an array, aggregate shapes of arrays, directionality of fastening elements, orientation of arrays, whether fastening elements are discrete or integral or some combination, fastening element constituent materials, the number of fastening elements, the number and/or types of layers from which integral fastening elements are formed, spacing of arrays from one another, and combinations thereof.
“Absorbent article” means a device that absorbs and contains body exudates and, more specifically, devices that are placed against or in proximity to the body of the wearer to absorb and contain the various exudates discharged from the body. Exemplary absorbent articles include diapers, training pants, pull-on pant-type diapers (i.e., a diaper having a pre-formed waist opening and leg openings such as illustrated in U.S. Pat. No. 6,120,487), refastenable diapers or pant-type diapers, incontinence briefs and undergarments, diaper holders and liners, feminine hygiene garments such as panty liners, absorbent inserts, and the like.
“Absorbent insert” and “insert” mean a component of a wearable absorbent article that is adapted to contain and/or absorb urine, feces, menses or any combination thereof, and is adapted to be installable and removable as a modular unit, from an outer cover. Herein, an absorbent insert may also be referred to as an “absorbent assembly”. The terms “absorbent insert,” “insert” and “absorbent assembly” may be used interchangeably herein.
“Chassis” means a component of a wearable absorbent article that is adapted to be worn about the lower torso of a wearer, and is adapted to support an absorbent insert and hold the insert next to the wearer's body. Herein, a chassis may also be referred to as an “outer cover”. The terms “outer cover” and “chassis” are interchangeable for purposes herein.
“Design element” as used herein means a shape or combination of shapes that visually create a distinct and discrete form, regardless of the size or orientation of the form. Design elements may comprise insignia. Design elements and/or combinations of design elements may comprise letters, words and/or graphics such as flowers, butterflies, hearts, character representations and the like. Design elements and/or combinations of design elements may comprise instructional indicia providing guidance or instruction to the caregiver relative to placement and/or fit of the article about the wearer. “Insignia” as used herein means objects, character representations, words, colors, shapes or other indicia that can be used to distinguish, identify or represent the manufacturer, retailer, distributor and/or brand of a product, including but not limited to trademarks, logos, emblems, symbols, designs, figures, fonts, lettering, crests or similar identifying marks.
“Disposed” refers to an element being located in a particular place or position. A feature that is disposed on a surface or side of a component may be integral with said component or may be joined to said component.
“Disposable,” when referring to an absorbent insert, means that the absorbent insert is not adapted or intended to be effectively sanitarily laundered in an ordinary household laundering process and ordinary household equipment, and thereby is ordinarily unsuitable for sanitary and effective reuse so as to provide as-new intended functions and performance, following soiling by exudates and removal from an outer cover. By way of non-limiting examples, effective laundering may be frustrated or prevented, causing the insert to be disposable, by inclusion of materials and/or construction: that do not retain their substantial as-new physical shape or structure through ordinary household laundering and drying so as to be effective as-new in reuse; that absorb aqueous liquids and cannot be sufficiently dried/dehydrated in ordinary household drying equipment and ordinary drying cycles so as to be effective as-new in reuse; that dissolve or substantially degrade in ordinary household laundering or drying, causing the insert to be substantially damaged or rendered useless; and/or that cannot be effectively cleaned of exudate material through ordinary laundering, so as to be sanitary and otherwise acceptable for re-use.
“Elastic” and “elastomeric” mean the ability of a material to stretch by at least 50% without rupture or breakage at a given load, and upon release of the load the elastic material or component exhibits at least 70% recovery (i.e., has less than 30% set) in one of the directions as per the Hysteresis Test described herein. Stretch, sometimes referred to as strain, percent strain, engineering strain, draw ratio, or elongation, along with recovery and set may each be determined according to the Hysteresis Test described in more detail below. Materials that are not elastic are referred as inelastic.
“Extensible” means the ability to stretch or elongate, without rupture or breakage, by at least 50% as per step 6 (a) in the Hysteresis Test herein.
“Inboard,” with respect to a first feature of an article and its position relative a second feature or location on the article, means that the first feature lies closer to a respective axis of the article than the second feature or location, along a horizontal x-y plane approximately occupied by the article when laid out flat, extended to the full longitudinal and lateral dimensions of its component web materials against any contraction induced by any included pre-strained elastomeric material, on a horizontal surface. Laterally inboard means the first feature is closer to the longitudinal axis, and longitudinally inboard means the first feature is closer to the lateral axis. Conversely, “outboard,” with respect to a first feature of an article and its position relative a second feature or location on the article, means that the first feature lies farther from the respective axis of the article than the second feature or location.
“Integral” means configurations whereby an element is created from or created by an article component, or portions thereof, as opposed to being joined to the component. “Integrally formed” means an element is created from an underlying material or portion thereof, by for example molding, shaping and/or reconstituting the material.
“Joined” means configurations whereby an element is directly secured to another element by affixing the element directly to the other element, and configurations whereby an element is indirectly secured to another element by affixing the element to intermediate member(s) that in turn are affixed to the other element.
“Longitudinal” means a direction lengthwise in a component such that the longitudinal direction runs parallel to the maximum linear dimension in the x-y plane of the component. In an absorbent article as described herein, the longitudinal direction runs substantially perpendicular from a waist end edge to an opposing waist end edge when the absorbent article is in a flat out, uncontracted state, or from a waist end edge to the bottom of the crotch in a bifolded article.
“Lateral” refers to a direction generally perpendicular to the longitudinal direction. In the absorbent article described herein, the lateral direction runs substantially parallel from a side edge to an opposing side edge.
“Outer cover” means a component of a wearable absorbent article that is adapted to be worn about the lower torso of a wearer, and is adapted to support an absorbent insert and hold the insert next to the wearer's body. Herein, an outer cover may also be referred to as a “chassis”. The terms “outer cover” and “chassis” are interchangeable for purposes herein.
“Reusable,” when referring to a component means that the component is adapted to be used for its intended purpose after initial use without substantial destruction of any portions of the component necessary for as-new functionality. For example, a reusable outer cover means an outer cover that is adapted to permit removal of at least a first insert, and replacement thereof with at least a second insert, without substantial destruction of any portions of the outer cover that are necessary to provide the substantial as-new functionality of the outer cover, and without the necessity of any repair or reconstruction following such insert replacement.
“User” means a caregiver or other person who may apply an absorbent article to a wearer. Where the wearer is capable of donning the wearable absorbent article him/herself, the wearer is also a “user”.
The absorbent article may comprise one or more fastening systems 100, which may be utilized, for example, to join the front and rear regions, to join the absorbent insert to the outer cover, and/or to join the outer cover to itself in an envelope fashion about the absorbent insert as suggested by
If it is desired that outer cover 20 be reusable, for outer cover 20 to remain substantially sanitary and useful (without requiring laundering or disposal) after removal and replacement of an insert, it may be desired that all parts of outer cover 20 remain substantially unsoiled after an exudation of waste (especially fecal matter) by the wearer. Thus, it may be desired that when insert 30 is installed within an outer cover 20, there is no non-removable portion or component of outer cover 20 that lies over or covers a substantial portion of wearer-facing surfaces of insert 30. Expressed differently, no non-removable portion or component of outer cover 20 is situated between a substantial portion of insert 30 and the wearer when the wearable absorbent article is worn, at least in the areas proximate to wearer body features that discharge exudates. Thus, it may be desired that outer cover 20 include no non-removable cover sheet or the like that covers or contains substantial portions of wearer-facing surfaces of insert 30 within outer cover 20, nor any overlying structures such as pockets, straps or flaps that substantially wrap or cover the insert proximate to exudate discharge points, or lie substantially between insert 30 and the wearer's anus and/or genitals, when the wearable absorbent article is worn. If outer cover 20 lacks such overlying structures, this may increase the likelihood that the wearer's exudates will contact only insert 30, and not portions of outer cover 20.
Outer cover 20 and/or layers or portions thereof may be made of any durable or semi-durable knitted, woven or nonwoven textile or textile-like material that is appropriately compatible with skin of the intended wearer(s). Suitable examples are described in U.S. Applications Ser. Nos. 12/687,493; 12/687,412; 12/687,528; and 12/687,425 (all by Roe et al.).
Non-limiting examples of fibers, nonwovens and laminates of nonwovens and films that might be considered for use as semi-durable outer cover materials may be found in U.S. Patents Nos. 7,223,818; 7,211,531; 7,060,149; 6,964,720; 6,905,987; 6,890,872; 6,884,494; 6,878,647; and 5,518,801; and U.S. Published Applications Nos. 2008/0319407; 2008/0045917; 2007/0293111; 2007/0287983; 2007/0287348; 2007/0249254; 2007/0203301; and 2005/0164587.
Outer cover 20 may be formed of a single layer of a durable or semi-durable material, or may have two or more layers in the front region 14 and/or rear region 18. Accordingly, referring to
In addition to forming differing layers of differing materials, it may be desirable to form a single layer of differing materials, for example, differing materials in the respective front, crotch and/or rear regions of the outer cover. Such differing materials may be joined at a seam such as inner seam 25 and/or outer seam 26. For example, the material predominately forming the inner surface of rear region 18 may be selected primarily for its elasticity features, which may better serve to provide snug fit about wearer body contours and accommodate wearer movement (i.e., about the buttocks and hips). By comparison, the material predominately forming the inner surface of front region 14 and/or crotch region 16 might be selected primarily for its hydrophobicity or hydrophilicity, which may better serve to contain liquid exudates.
Layers or other elements of the outer cover may be joined to each other via any suitable mechanism, including, for example, adhesives, mechanical bonding, ultrasonic bonding, sewing, stitching, serging, edging, and the like.
Waist Features, Leg Gasketing Systems, Ears
Referring again to
In alternative embodiments, the waist feature may be inelastic. In such configurations, the waist feature may provide additional anchoring about the waist of the wearer.
Additionally, or alternatively, the article may comprise a leg gasketing system 50, portions of which may be formed by the outer cover and/or the absorbent insert. The outer cover may include one or more elastic elements 28, such as films or elastic strands, extending through all or a portion of the leg opening 51 to form a leg band portion 52. The elastic elements may be laminated with one or more nonwoven layers and/or one or more textile layers. As described with respect to the waist feature, the leg band portion may include rugosities 29 as result of the lamination process. In other nonlimiting examples, the leg band portion may be a zero strain, activated laminate.
The waist features and/or leg band portions may be disposed along the edge of the outer cover, and in some circumstances, it may be desired to have elasticized waist and leg band portions situated along substantially the entire length of the leg and/or waist openings so as substantially or completely encircle the wearer's legs and/or waist while outer cover 20 is worn. The gathered material within rugosities 29 can serve to accommodate stretching of waist feature and leg band portions. This arrangement not only may provide for better fit about the wearer's legs, but also may enable the outer cover 20, when formed of appropriately sized and shaped material, to form a pouch-like structure 53 in the crotch region (see
The outer cover may include ears 70 in one or both of the front and region regions. As shown in
Returning to
The longitudinal sides 35 may be generally parallel to the longitudinal axis. Alternatively, the longitudinal sides 35 may be curved, such as in an hour-glass configuration. Thus, the width of the insert, Wi, may vary. In nonlimiting examples, the width of the insert, Wi, is less than the width of the outer cover, Wcv, at one or more longitudinal positions. The width of the insert, Wi, may be less than the width of the outer cover, Wcv, throughout the length of the insert.
The insert also may include one or more grasp structures 43, such as forward and rearward grasp structures. The grasp structures may be provided to enable the user to quickly and easily grasp the insert, handle the insert during application and/or properly place the insert. In certain embodiments, the grasp structure may have a different tactile feel than surrounding or adjacent areas to distinguish the area and ease the user's identification of the grasp structures. The tactile feel of the grasp structure may be provided via fastening elements 114, such as integral fastening elements, and/or protrusions extending above or below the x-y plane of the substrate forming the grasp structure.
As shown in
Returning to
It may be desirable to include a stiffening component 72 proximate to one or both ends of the insert 30, but especially an end adapted with a singularized and relatively localized fastening location providing a force-decoupled arrangement, as is discussed below. Referring to
The topsheet 32 is generally a portion of the absorbent article 10 that may be positioned at least in partial contact or close proximity to a wearer. Suitable topsheets 32 are generally supple, soft feeling, and non-irritating to a wearer's skin. Further, at least a portion of, or all of, the topsheet may be liquid permeable, permitting liquid bodily exudates to readily penetrate through its thickness. A suitable topsheet may be manufactured from a wide range of materials, such as porous foams, reticulated foams, apertured plastic films, woven materials, nonwoven materials, woven or nonwoven materials of natural fibers (e.g., wood or cotton fibers), synthetic fibers or filaments (e.g., polyester or polypropylene or bicomponent PE/PP fibers or mixtures thereof), or a combination of natural and synthetic fibers. The topsheet may have one or more layers. The topsheet may be apertured, may have any suitable three-dimensional features, and/or may have a plurality of embossments (e.g., a bond pattern). The topsheet 32 may comprise one or more apertures 74. The topsheet may be apertured by overbonding a material and then rupturing the overbonds through ring rolling, such as disclosed in U.S. Pat. No. 5,628,097, to Benson et al., issued on May 13, 1997 and disclosed in U.S. Pat. Appl. Publication No. US 2016/0136014 to Arora et al. Any portion of the topsheet may be coated with a skin care composition, an antibacterial agent, a surfactant, and/or other beneficial agents. The topsheet may be hydrophilic or hydrophobic or may have hydrophilic and/or hydrophobic portions or layers. If the topsheet is hydrophobic, typically apertures will be present so that bodily exudates may pass through the topsheet.
Topsheet 32, backsheet 34 or any portion of the topsheet or backsheet may be embossed and/or matte finished to provide a more cloth-like appearance.
Backsheet 34 is generally the outer liner portion of insert 30 forming the garment-facing surface 64 thereof, and prevents the exudates absorbed and contained within insert 30 from wicking through and soiling the outer cover.
The backsheet 34 may comprise one or more nonwovens, elastomeric films, foams, strands, or combinations of these or other suitable materials with nonwovens or synthetic films. In nonlimiting examples, the backsheet is a laminate of an elastomeric material, such as a film, and a nonwoven.
In certain embodiments, the backsheet 34 is substantially water-impermeable. The backsheet may, for example, be or comprise a thin plastic film, such as a thermoplastic film having a thickness of about 0.012 mm to about 0.051 mm. Other suitable backsheet 34 materials may include breathable materials that permit vapors to escape from the absorbent article 10 while still preventing exudates from passing through the backsheet 34.
In certain embodiments, the backsheet 34 may have a water vapor transmission rate (WVTR) of greater than about 2000 g/24 h/m2, greater than about 3000 g/24 h/m2, greater than about 5000 g/24 h/m2, greater than about 6000 g/24 h/m2, greater than about 7000 g/24 h/m2, greater than about 8000 g/24 h/m2, greater than about 9000 g/24 h/m2, greater than about 10000 g/24 h/m2, greater than about 11000 g/24 h/m2, greater than about 12000 g/24 h/m2, greater than about 15000 g/24 h/m2, measured according to WSP 70.5 (08) at 37.8 ° C. and 60% Relative Humidity. A higher WVTR may be desired in this particular application, since the insert backsheet 34 will not form the outer surface of the wearable article, as a conventional disposable diaper backsheet would, but rather, will be covered by the one or more layers of the outer cover material(s)—which themselves may act in some circumstances to reduce WVTR of the composite structure.
Other suitable materials and/or manufacturing techniques may be used to provide a suitable backsheet 34 including, but not limited to, surface treatments, particular film selections and processing, particular filament selections and processing.
Backsheet 34 may be joined to topsheet 32, absorbent core 44 or any other element of insert 30 by any suitable attachment mechanism known in the art. For example, the attachment mechanism may include a continuous line or layer of adhesive, a patterned layer of adhesive, or an array of separate lines, spirals, or spots of adhesive. One example of an attachment mechanism comprises an open pattern network of filaments of adhesive as disclosed in U.S. Pat. No. 4,573,986. Other suitable attachment mechanisms include several lines of adhesive filaments which are swirled into a spiral pattern, as is illustrated by the apparatus and methods shown in U.S. Pat. Nos. 3,911,173; 4,785,996; and 4,842,666. Adhesives which have been found to be satisfactory are manufactured by H. B. Fuller Company of St. Paul, Minn. and marketed as HL-1620 and HL 1358-XZP. Alternatively, the attachment mechanism may comprise heat bonds, pressure bonds, ultrasonic bonds, dynamic mechanical bonds, or any other suitable attachment mechanisms or combinations of these attachment mechanisms known in the art.
It will be appreciated that the outer cover described above can be constructed of materials and construction so as to bear and sustain a majority of the structural loading generally imposed upon a disposable diaper, by stretching and accommodation of the wearer's anatomical features and body movements, and by absorption, swelling and added weight resulting from the wearer's exudations of waste. Thus, lesser requirements for structural strength of an insert might be present with use of such an outer cover, as compared with strength required of inside components of a disposable diaper. Therefore, an article such as described herein may include a disposable absorbent insert manufactured from materials that are different from those ordinarily used in the manufacture of disposable diapers, such as petroleum-derived materials, e.g., polyethylene and polypropylene. For example, a disposable absorbent insert having one or more of a topsheet, backsheet, standing cuffs and/or other components formed of products of wood, cotton, flax (linen), hemp, bamboo, or other cellulose fibers (e.g., paper), in addition to the materials identified above, is contemplated. If resistance to aqueous liquid penetration or substantial liquid impermeability is desired, e.g., for a backsheet and/or standing cuffs, a material formed of ordinarily hydrophilic fibers such as paper may be coated or impregnated with a hydrophobic material, such as a skin-compatible oil or wax, to impart the desired resistance to aqueous liquid penetration. Each of the materials forming the insert may be selected so as to be dispersible in water or an aqueous solution, flushable, biodegradable and/or compostable (preferably to an agriculturally usable humus or soil amendment).
Turning to
absorbent gelling materials (AGM); or any other known absorbent material or combinations of materials. The absorbent core may have an absorbent capacity of at least about 120 g, or at least about 150 g, or at least about 200 g, or from about 120 to about 300 g, reciting for said range every 10 increment therein, as determined by the Centrifuge Retention Capacity Test Method herein. In certain embodiments, at least a portion of the absorbent core is substantially cellulose free and contains less than 10% by weight cellulosic fibers, less than 5% cellulosic fibers, less than 1% cellulosic fibers, no more than an immaterial amount of cellulosic fibers or no cellulosic fibers. It should be understood that an immaterial amount of cellulosic material does not materially affect at least one of the thinness, flexibility, and absorbency of the portion of the absorbent core that is substantially cellulose free. Among other benefits, it is believed that when at least a portion of the absorbent core is substantially cellulose free, this portion of the absorbent core is significantly thinner and more flexible than a similar absorbent core that includes more than 10% by weight of cellulosic fibers. The amount of absorbent material, such as absorbent particulate polymer material 45a present in the absorbent core may vary, but in certain embodiments, is present in the absorbent core in an amount greater than about 80%, or greater than about 85%, or greater than about 90%, or greater than about 95% by weight of the core. In nonlimiting examples, a thermoplastic material, such as a thermoplastic adhesive composition 46, may be used to immobilize superabsorbent particles on a substrate (e.g., the topsheet, backsheet or core wrap).
In some embodiments, as shown in
The channels 47 may extend longitudinally or laterally. The absorbent core may further comprise two or more channels. The channels may be straight, curvilinear, angled or any workable combination thereof. In nonlimiting examples, two channels are symmetrically disposed about the longitudinal axis.
The absorbent core 44 may include a core wrap 48, comprising one or more substrates 49 to encloses the absorbent material 45. Where channels are present, the core wrap may be bonded within one or more channels, thereby providing permanent channels which maintain their channel structure in the wet state.
The absorbent core 44 may be manufactured in a wide variety of sizes and shapes (e.g., rectangular, hourglass, “T”-shaped, etc.). The configuration and construction of absorbent core 44 may also be varied (e.g., the absorbent core(s) or other absorbent structure(s) may have varying caliper zones, hydrophilic gradient(s), a superabsorbent gradient(s), or lower average density and lower average basis weight acquisition zones; or may comprise one or more layers or structures). Exemplary absorbent structures for use as the absorbent core 44 are described in U.S. Pat. Nos. 4,610,678; 4,673,402; 4,834,735; 4,888,231; 5,137,537; 5,147,345; 5,342,338; 5,260,345; 5,387,207; 5,397,316, and U.S. patent appliance Nos. 13/491,642 and 15/232,901.
Referring to
As noted above, the article 10 may comprise a leg gasketing system 50, portions of which may be formed by the insert 30. Returning to
The standing leg cuffs may be integral with the topsheet 32 or the backsheet 34 or may be a separate material joined to the topsheet and/or backsheet. Each standing leg cuff 54 may comprise one, two or more elastic elements 28 close to the free terminal edge 56 to provide a better seal. The standing cuff may be formed of any of a variety of substrates such as plastic films and woven or nonwoven webs of natural fibers (e.g., wood or cotton fibers), synthetic fibers (e.g., polyester or polypropylene fibers), or a combination of natural and synthetic fibers. In certain embodiments, the standing cuffs may be formed of a substantially liquid impermeable web to contain and isolate liquid exudates from the outer cover, outer clothing and environment of the wearer and/or may be formed of a vapor permeable web for breathability of the insert and article.
Referring to
In further embodiments, the leg gasketing system comprises standing leg cuffs that are integral with gasketing cuffs. Suitable leg gasketing systems which may be part of the absorbent article are disclosed in U.S. Pat. App. No. 62/134,622, 14/077,708; U.S. Pat. Nos. 8,939,957; 3,860,003; 7,435,243; 8,062,279.
As noted above, the article 10 may comprise one or more fastening systems 100 as shown for example in
In further nonlimiting examples, the article 10 includes a third fastening system 100c to further secure the article about the waist of the wearer. In such nonlimiting examples, the outer cover may comprise primary and secondary fastening systems (100a, 100c) having two distinct fastening locations, which deconcentrates lateral tensile focuses and reduces the tendency of the front portion of the article to pivot around the single fastening location. Suitable dual fastening systems are disclosed for example in U.S. patent appliance Ser. Nos. 16/684,230 and 16/545,425.
The article may include a fourth fastening system 100d to secure the outer cover flap 76 to the topsheet and/or backsheet as indicated in
Each system may comprise one or more fastening components 110 and one or more receiving components 112. A receiving component is operatively engageable with a fastening component. Nonlimiting examples of engageable fastening and receiving components include tape tabs, hook and loop fastening components, interlocking fasteners such as tabs & slots, buckles, buttons, snaps, and/or hermaphroditic fastening components. Some exemplary surface fastening systems are disclosed in U.S. Pat. Nos. 3,848,594; 4,662,875; 4,846,815; 4,894,060; 4,946,527; 5,151,092; and 5,221,274. An exemplary interlocking fastening system is disclosed in U.S. Pat. No. 6,432,098. The fastening component and/or the receiving component may further include a release tape or other material, including folded material, that protects the component from insult prior to use.
The fastening component 110 comprises one or more fastening elements 114 which cause the component to join with another surface, such as the receiving component. In various embodiments, fastening elements comprise hooks 116. Receiving component 112 comprises material adapted to fastenably cooperate with fastening elements, such as a section or patch adapted to serve as cooperative loops material, to provide a hook-and-loop fastening system combination. The fastening and/or receiving components may be discrete from and joined to the outer cover or absorbent insert or may be integral with one or both. In nonlimiting examples, nonwoven material (such as nonwoven material forming portions of the outer cover surfaces or portions of the insert backsheet or topsheet) may be comprise integral loops material 125 as illustrated in
Fastening and receiving components may be disposed in various locations depending on the desired functionality of the fastening system. The outer cover 20 may comprise a fastening component on its wearer-facing surface 22, such as on the wearer-facing surface of its ear 70, and comprise a receiving component 112 on the garment-facing surface 24 of the opposing waist region as indicated in
The absorbent insert 10 may comprise one or more insert fastening components 110I on its garment-facing surface 66, and the outer cover 20 may comprise one or more insert receiving components 112I on its wearer-facing surface 22 as shown in
Fastening and/or receiving components may be disposed along the longitudinal sides proximate the ends of the insert in the forward and/or rearward region of the insert. Fastening and/or receiving components may be disposed adjacent an edge of the insert, or may be disposed laterally and longitudinally inboard of the edge. For example, a fastening and/or receiving component may be disposed no more than about 50 mm from the front lateral edge 31, or no more than about 25 mm from the front lateral edge, or from about 5 mm to about 50 mm, or from about 10 mm to about 25 mm inboard of the front lateral edge, reciting for each range every 1 mm increment therein. A fastening and/or receiving component may be disposed no more than about 50 mm, or no more than about 25 mm, or from about 5 mm to about 50 mm, or from about 10 mm to about 25 mm inboard of the rear lateral edge 33, reciting for each range every 1 mm increment therein.
In various nonlimiting examples, at least about 50%, or at least about 75%, or at least about 90%, or substantially all of the wearer-facing surface of the outer cover is adapted to serve as an insert receiving component 112I (i.e., at least 50% etc. of the surface area of the wearer-facing surface is a receiving component). In this way, the placement of the absorbent insert is less limited by the receiving component position, or not at all limited in embodiments where substantially all of the outer cover surface comprises the receiving component.
It is also contemplated that the absorbent insert may comprise one or more insert receiving components 112I, and at least about at least about 50%, or at least about 75%, or at least about 90%, or substantially all of the garment-facing surface of the absorbent insert may be adapted to serve as an insert receiving component 112I. In nonlimiting examples, the fastening component 110I may be smaller than the receiving component 112I. The fastening component 110I may comprise a length, Lmax, that about 50% or less, or about 40% or less, or about 30% or less, or from about 5% to about 50%, or from about 10% to about 30%, of the length of the insert receiving component to which it engages, reciting for each range every 5% increment therein. The overall thickness 316 of the receiving component 112I can be from about 1 to about 1000 micrometers, or from about 350 micrometers to about 650 micrometers, reciting for each range every 20 micrometer increment therein, as measured by the Thickness Test Method herein. The insert receiving component may comprises a basis weight of about 10 gsm to about 100 gsm, reciting for said range every 2 gsm increment therein.
The insert receiving component may be formed from a fibrous material wherein the majority of fibers comprise a cross-sectional dimension of about 25 micrometers or less, or about 20 micrometers or less, or about 15 micrometers or less, or from about 5 micrometers to about 150 micrometers, reciting for said range every 5 micrometer increment therein. The fibers may comprise any suitable cross-sectional shape, including circular, oval, squarish, rectangular, triangular, star-shaped, multi-lobal and combinations thereof. In nonlimiting examples, a majority of the fibers comprise a cross-sectional shape that is round. For fibers with non-circular cross sections, the overall fiber cross-sectional dimension is the largest distance measured linearly across the cross-section of the fiber. The overall fiber cross-sectional dimension of a fiber can be determined by making measurements on an enlarged image of the fiber, taken with equipment, at high magnification. For example, a Scanning Electron Microscope can be used.
The insert receiving component may be formed from any suitable material including a nonwoven, woven, polyester, nylon and combinations thereof.
The insert fastening and receiving component combination may comprise a CD Shear Strength of about 40 N or less, or about 20 N or less, or about 10 N or less, or about 5 N or less, or about 3 N or less, or from about 2 N to about 40 N, according to the Dynamic Shear Strength Test Method herein, reciting for said range every 1 N increment. Additionally, or alternatively, the insert fastening and receiving component combination may comprise a CD Peel Strength of about 3 N or less, or about 2 N or less, about 1.5 N, or about 1 or less, or about 0.5 or less, or from about 0.2 to about 3N, reciting for said range every 0.25 N increment therein, according to the Peel Strength Test Method herein. Without being bound by theory, it is believed the thickness, basis weight, fiber cross-sectional dimension, shear strength and/or peel strength cited herein facilitates the fastening system effectively retaining the insert to the outer cover in the proper position relative to the wearer's anatomy during use with being overly abrasive to the outer cover or causing tearing during removal.
Fastening and/or receiving component may be discrete from the outer cover or absorbent insert, or may be integral with the outer cover or absorbent insert. Any workable arrangement of the fastening component and receiving components is within scope of the present invention. Additional details of fastening and receiving components are discussed below
Additionally, or alternatively, a fastening system may form a singularized and localized fastening location proximate each of, or either, the forward/front and/or rearward/rear ends/regions. Having only two respectively singularized, localized fastening locations provides an advantage of simplicity and ease of installation for the user, by presenting only two locations at which the user must co-locate and fasten the absorbent insert 30 to the outer cover 20. Additionally, having a single, localized fastening location proximate only one or two ends of insert 30 provides a partially force-decoupled attachment of the insert 30 within the outer cover 20. This may be especially desired in the rear region 18 of outer cover 20, where extensibility and/or elasticity of outer cover 20 may be especially desired to maintain fit, comfort and appearance while accommodating body contours and movements of the wearer about the buttocks and hips. With this force-decoupled arrangement, the portions of outer cover 20 surrounding fastening element (s) 110, such as waistband portions 27, and front and rear regions 14, 18, may laterally stretch and contract substantially independently of and unimpeded by the structure of insert 30 and portions thereof.
Thus, in one example, referring to
In some embodiments, the fastening component 110 may be separately applied sections or patches of fastening elements that are bonded to absorbent insert or chassis by heat, compression, adhesive, ultrasonic bonding or any combination thereof.
In other examples, a fastening component may be a plurality of integrally formed fastening elements 114, such as fastening elements that are formed directly on a section of the outer cover or absorbent insert, or more particularly formed directly on a section of a polymeric layer of nonwoven. For example, fastening hooks 116 may be produced via application of molten polymer resin onto the layer, and subsequent formation of hooks in and from the melted, applied resin via known methods. The fastening components may be integrally formed from polymeric material by heating and softening a portion of the material and pressing it into hook-forming cavities, as is disclosed in U.S. Pat. No. 8,784,722. The fastening components may be integrally formed from the polymeric material through a single continuous process as is disclosed in commonly assigned U.S. Pat. App. No. 16/545,425, under attorney docket 15308M. Hooks-forming cavities may be formed and arranged on a hooks-forming roller in any desired configuration of hook size, shape, number, density, placement pattern, and arrangement of areas of hooks.
Using the molding process described above, the practical constraints and/or costs presented by supply and application of a continuous strip of pre-manufactured hooks material are eliminated, and the areas of fastening elements may be provided on the nonwoven material in any desired configuration, such as the configurations reflected in
By way of nonlimiting examples, areas of fastening elements may be disposed in lines, rectangular shapes and/or shapes formed from curvilinear sections. Areas of fastening elements may be configured as discrete, discontinuous shapes entirely surrounded by areas not occupied by fastening elements, as may be seen in
Further to the above, integral fastening elements may be formed with varying directionality to provide different benefits in different sections of the component. For instance, hooks which are asymmetric about their vertical centerline (e.g., the inverted J-shape shown in
Other hook shapes are shown in
The flexibility in the above-mentioned process permits more precise placement of fastening elements to effectuate certain properties (e.g., greater bond strength) in certain areas. Returning to
Turning to
The article component 150 may comprise the outer cover 20 and/or the absorbent insert 30, or discrete materials joined to the outer cover and/or insert (e.g., discrete leg cuff materials, ears, waistbands, landing zone patches of material) and any combinations of the foregoing.
The macro pattern may comprise at least about 20%, or at least about 40%, or at least about 50%, or at least about 60%, or at least about 75%, or about 100% of integrally formed fastening elements 130 based on the number of fastening elements. Integral fastening elements 130 may be formed from one material layer 140 of the absorbent article component 150 as suggested in
Differing arrays allows for differences in fastener properties at different locations. Two arrays may differ in peel strength, types of fastening elements, types of hook shapes (if applicable), directionality of fastening elements, aggregate shape, surface area, opacity, color, spacing of fastening elements, size of elements, number of fastening elements, constituent fastening element material, design element(s) and combinations thereof.
Where multiple fastening systems are provided on the article, they may differ in peel strength, macro patterns (including the presence or absence of a macro pattern), types of hook shapes (if applicable), directionality of fastening elements, size of fastening and/or receiving components, types of fastening elements (e.g., hooks, adhesive), types of receiving components, fastening component type (i.e., integral or discrete or combination), receiving component type (i.e., integral or discrete or combination), location of fastening and/or receiving components and combinations thereof. Where multiple fastening components each comprise macro patterns, the macro patterns may differ by peel strength, design element, surface area, opacity, color, array characteristics noted above, combination of arrays, spacing of arrays from one another, relative positioning of arrays, the number of arrays and combinations thereof.
Further to the above, it is to be understood fastening systems need not necessarily include respective components of a two-component fastening system. Rather, a fastening system may require only one component. By way of nonlimiting example, a fastener component on outer cover 20 may include a patch of adhesive; a structure having a region of relatively high coefficient of friction; a pocket; flap; strap; or other capturing, holding and/or retaining surface, device or structure. Thus, a receiving component is unnecessary. Referring to
Components of the disposable absorbent article can at least partially be comprised of bio-sourced content as described in U.S. Pat. Pub. Nos. 2007/0219521A1, 2011/0139658A1, 2011/0139657A1, 2011/0152812A1, and 2011/0139659A1. These components include, but are not limited to, topsheets, backsheet films, backsheet nonwovens, side panels, leg gasketing systems, superabsorbent, acquisition layers, core wrap materials, adhesives, outer covers, fastener systems, and landing zones. In at least one embodiment, a disposable absorbent article component comprises a bio-based content value from about 10% to about 100%, or from about 25% to about 75%, or from about 50% to about 60% using ASTM D6866-10, method B. In order to apply the methodology of ASTM D6866-10 to determine the bio-based content of any component, a representative sample of the component must be obtained for testing. In at least one embodiment, the disposable absorbent article component can be ground into particulates less than about 20 mesh using known grinding methods (e.g., WILEY® mill), and a representative sample of suitable mass taken from the randomly mixed particles.
A. An absorbent article comprising:
B. The absorbent article of paragraph A wherein the facing component comprises integrally formed hooks.
C. The absorbent article of paragraphs A or B wherein the fastening component is disposed on the absorbent insert and the receiving component is disposed on the outer cover.
D. The absorbent article of any of the preceding paragraphs wherein the fastening component is disposed on the outer cover and the receiving component is disposed on the absorbent insert.
E. The absorbent article of any of the preceding paragraphs wherein the receiving component comprises integrally formed loops.
F. The absorbent article of any of the preceding paragraphs wherein the absorbent article comprises at least about 10% bio-based content.
G. The absorbent article of any of the preceding paragraphs wherein the outer cover is reusable and the absorbent insert is disposable.
H. The absorbent article of any of the preceding paragraphs wherein the fastening component comprises a micro pattern having a maximum width, Wp, that is at least about 50% of the width of the absorbent insert.
I. The absorbent article of any of the preceding paragraphs wherein the fastening component comprises fastening elements at least partially overlapping the longitudinal axis.
J. The absorbent article of any of the preceding paragraphs wherein the fastening component comprises fastening hooks at least partially overlapping the lateral axis.
K. The absorbent article of any of the preceding paragraphs wherein the fastening component comprises a first macro pattern of fastening elements and a second macro pattern of fastening elements, wherein the first and second macro patterns differ by design element, surface area, opacity, color, average size of fastening elements within an array, average spacing of fastening elements within an array, aggregate shapes of arrays, directionality of fastening elements, orientation of arrays, whether fastening elements are discrete or integral or some combination, fastening element constituent materials, the number of fastening elements, the number and/or types of layers from which integral fastening elements are formed, spacing of arrays from one another, and combinations thereof.
M. The absorbent article of any of the preceding paragraphs wherein the receiving component is integral with one of the absorbent insert or outer cover.
N. The absorbent article of any of the preceding paragraphs wherein the receiving component comprises a plurality of fibers, and a majority of the fibers have a cross-sectional dimension of 5 to 150 micrometers.
O. The absorbent article of any of the preceding paragraphs wherein the fastening and receiving component together comprise a CD Shear Strength of about 40 N or less.
P. The absorbent article of any of the preceding paragraphs wherein the fastening and receiving component together comprise a CD Peel Strength of about 3 N or less.
Q. The absorbent article of preceding paragraphs wherein the fastening component comprises a maximum length that is about 30% or less of a maximum length of the receiving component.
Hysteresis Test
The following test methods utilize a commercial tensile tester (e.g., from Instron Engineering Corp. (Canton, Mass.), SINTECH-MTS Systems Corporation (Eden Prairie, Minn.) or equivalent) interfaced with a computer. The computer is used to control the test speed and other test parameters and for collecting, calculating, and reporting the data. The tests are performed under laboratory conditions of 23 deg. C.+−2 deg. C. and relative humidity of 50%+−2%. The samples are conditioned for 24 hours prior to testing.
1. Select a 2.54 cm (width), 7.62 cm (length) sample of the material for testing. In some cases, if it is not be possible to get a 2.54 cm×7.62 cm sample, a smaller sample may be used, but a gage length of 25 mm must still be used. If the sample is activated or includes an activation portion, the length of the sample is taken in the direction of activation.
2. Select the appropriate jaws and load cell. The jaws must have flat surfaces and must be wide enough to fit the sample (e.g., at least 2.54 cm wide). Also, the jaws should provide adequate force to ensure that the sample does not slip during testing. The load cell is selected so that the tensile response from the sample tested is between 25% and 75% of the capacity of the load cell used.
3. Calibrate the tester according to the manufacturer's instructions.
4. Set the distance between the grips at 25 mm
5. Place the sample in the flat surface of the jaws such that the longitudinal axis of the sample is substantially parallel to the gauge length direction. Mount the sample with minimal slack. Set the slack preload at 0.02 N/cm. This means that the data collection starts when the slack is removed with a force of 0.02 N/cm. Strain is calculated based on the adjusted gauge length (lini), which is the length of the sample in between the grips of the tensile tester at a force of 0.02 N/cm. This adjusted gauge length is taken as the initial sample length, and it corresponds to a strain of 0%. Percent strain at any point in the test is defined as the change in length divided by the adjusted gauge length times 100%.
6(a) First cycle loading: Pull the sample to a strain of 50% at a constant cross head speed of 254 mm/min.
6(b) First cycle unloading: Hold the sample at 50% strain for 30 seconds and then return the crosshead to its starting position (0% strain) at a constant cross head speed of 254 mm/min. Hold the sample in the unstrained state for 1 minute.
6(c) Set from second cycle loading: Pull the sample at a constant cross head speed of 254 mm/min, till it reaches a load of 0.05 N/25.4 mm (0.020 N/cm). Record the extended gauge length (lext). Next, return the crosshead to its starting position (zero strain) at a constant cross head speed of 254 mm/min. Set is defined as the strain at a second cycle load of 0.05 N/25.4 mm (0.020 N/cm). Calculate % set as indicated below.
6(d) Second cycle unload: Next, return the crosshead to its starting position (zero strain) at a constant cross head speed of 254 mm/min.
Percent Set is defined as the percent strain at a second cycle load of 0.05 N/25.4 mm (0.020 N/cm). Calculate % set as indicated below.
A computer data system records the force exerted on the sample during the test as a function of applied strain. From the resulting data generated, the following quantities are reported (note that loads are reported as force divided by the width of the sample and do not take into account the thickness of the sample):
1. Loads at 25% strain and 50% strain (N/cm)
2. % set (Percent Strain measured at a second cycle load of 0.02 N/cm);
3. % set=(lext-lini)/lini*100%.
Five repetitions are done on each sample and the average and standard deviation reported. The Hysteresis Test can be suitably modified depending on the expected attributes and/or properties of the particular material sample to be measured. For example, the Test can be suitably modified where a sample of the length and width specified above are not available from the subject article.
The Centrifuge Retention Capacity (CRC) is a measure of the fluid retention capacity of a specimen submerged in 0.9% NaCl saline solution for 30 minutes and then subjected to centrifugation. The test is a based on the Worldwide Strategic Partners Standard Test Method WSP 241.2 (09), Gravimetric Determination of Fluid Retention Capacity in Saline Solution after Centrifugation.
For analysis, specimens are placed into a bag constructed from heat-sealable, water-permeable, non-apertured nonwoven. Specifications for the bag material are given in WSP 241.2(09). Measure the length (L) and width (W) of the specimen to be tested. Cut a piece of the bag material that is 2×L+50 mm by W+25 mm Fold the bag material in half across its width and heat-seal two of the open edges approximately 3 to 5 mm from the edges. The finished bag is L+25 mm by W+25 mm. In addition to the bags for samples, prepare three bags of the same dimensions to be used as blanks.
Absorbent Insert Sample Preparation: Precondition samples at about 23″ C.±2° C. and about 50%±2% relative humidity for 2 hours prior to testing. The absorbent insert is unfolded and placed with the wearer-facing surface facing upward. Using scissors cut any elastic along the longitudinal edges of the article at an interval of approximately 2 cm, such that the article can be laid flat. Lay the absorbent insert on a piece of aluminum foil and cut the absorbent insert along the longitudinal and lateral axis resulting in four individual specimens. On a calibrated balance, tare the weight. of an appropriately sized bag. Place the specimen, and any material that fell onto the foil during cutting, into the tarred bag and heat seal the remaining open edge. Obtain and record the dry mass of the specimen to the nearest 0.001 grams. Repeat this procedure to obtain the dry mass of the remaining specimens. Three replicate absorbent inserts are prepared for testing.
Obtain a pan large enough to hold several bags or specimens, and fill it with 0.9% saline solution to a level such that the bag or specimen may be completely submerged. Lay the bags or specimens to be tested onto the surface of the saline, and allow them to become wet for 1 minute before submerging. A weight placed onto the edge of the bag may be used to ensure that the sample remains submerged while allowing the solution to be freely absorbed by the specimen. After 30 minutes remove the bag or specimen from the saline solution, and immediately transfer it into the basket of a suitable centrifuge capable of subjecting the specimens to a 250 G centrifugal acceleration (such as a Clay Adams Dynac Centrifuge available from Block Scientific, Bohemia, N.Y.). Orient the specimens in the centrifuge such that the wearer-facing surface is facing outward, unless the wearer-facing, surface is hydrophobic, in which case it should be oriented inward. Position the bags or specimens so that similarly weighted samples are opposite each other for proper balancing. Centrifuge the bags or specimens for 3 minutes±10 seconds at 250 G. The bags or specimens are then removed and immediately weighed. Record the wet mass of the specimen and bag, blank bag, or specimen without a bag to the nearest. 0.001 grams.
Calculate the average of the three wet blank bag masses after centrifugation (mb); this value is disregarded if the specimen was tested without a bag. For each specimen (i=1, 2, and 3), calculate. the centrifuge retention capacity (Wi), expressed as a mass fraction (g/g) using the following equation:
w
i=((mwi−mb)−msi)/msi
Where misi is the mass, expressed in grains, of the dry specimen and mwi is the mass, expressed in grams, of the wet specimen and bag or specimen without a bag. For the absorbent inserts cut and tested as four separate specimens. Sum up the four individual masses of the dry specimens to get msi, sum up the four individual masses of the wet specimens and bags to get mwi, and sum up four of the average wet blank bag masses after centrifugation to get mb. Use these values to calculate a total centrifuge retention capacity (wi) value. Calculate and report the average centrifuge retention capacity for the three replicates to the nearest 0.001
The Dynamic Shear Strength Method is used to determine the force required to shear a fastening component from a receiving component and follows the general principles laid out in ASTM D5169-98. The resulting force is reported as the CD Shear Strength.
In this method, at least five specimens of like articles are analyzed. Fastening components and receiving components are excised from each article, optionally with the aid of cryogenic freeze spray if needed. If fusion bonds are present affixing the fastening or receiving components to one or more layers beneath, these bonds are left intact, and the included layers along with the hook are excised as a laminate and are included in subsequent testing.
In this method, the CD dimension of each of the fastening component and receiving component refer to the axes that were parallel to the lateral axis of the article prior to excision. (Similarly, the MD dimension of the fastening and receiving components are those that were parallel to the longitudinal dimension of the article prior to their excision.) The fastening component is placed on the receiving component in the approximate orientation in which the two components would be in contact in the article. If both the fastening component and receiving components are greater than 13 mm their respective CD dimensions, they are offset so as to overlap in the CD by 13 mm. Otherwise, the alignment in the CD dimension is chosen so as to maximize the CD dimension of overlap. The fastener is affixed to the receiving area, and the area of contact is rolled with a 5-kg roller as specified in ASTM D5169-98. The area of contact between the fastening component and receiving component is measured and recorded as the specimen contact area to the nearest square millimeter.
A tensile tester is configured with a 3-in gauge length, and the area of contact is centered between the clamps. If free portions of the fastening and/or receiving components are insufficiently long to be securely clamped, double-sided table is used to affix heavy paper extension leads of sufficient length to allow the specimen to be held securely in the clamps of the tensile tester. The specimen (with heavy paper leads affixed if necessary) is clamped in the tensile tester and the tensile tester's moving crosshead is moved (parallel to the CD dimension of both components) at 305 mm/min until the fastening component and receiving component are delaminated. The peak force in Newtons is recorded to the nearest 0.1 N as the unscaled specimen shear force. The unscaled specimen shear force is then normalized to correspond to a specimen contact area of 25.4 mm×13 mm (or 330.2 mm2) to arrive at the specimen shear strength (in Newtons to the nearest 0.1 N) for that specimen via the equation:
At least five like specimens are analyzed in this way, and the arithmetic mean of all of the specimen shear strength values for all of the specimens is calculated and reported as the CD Shear Strength in units of Newtons to the nearest 0.1 N.
The Peel Strength Method is used to determine the force required to peel a fastening component from a receiving component and follows the general principles laid out in ASTM D5170-98. The resulting force is reported as the CD Peel Strength.
In this method, at least five specimens of like articles are analyzed. Fastening components and receiving components are excised from each article, optionally with the aid of cryogenic freeze spray if needed. If fusion bonds are present affixing the fastening or receiving components to one or more layers beneath, these bonds are left intact, and the included layers along with the hook are excised as a laminate and are included in subsequent testing.
In this method, the CD dimension of each of the fastening component and receiving component refer to the axes that were parallel to the lateral axis of the article prior to excision. (Similarly, the MD dimension of the fastening and receiving components were those that were parallel to the longitudinal dimension of the article prior to their excision.) The fastening component is positioned relative to the receiving component in the orientation in which the two components would be in contact in the article and affixed to the receiving component and is rolled using the 5-kg roller specified in ASTM D5170-98. The overlap width is defined as the MD dimension of overlap between the hook component and the receiving component and is recorded to the nearest millimeter.
A tensile tester is configured with a 2 in gauge length. Double-sided table is used to affix heavy paper extension leads of sufficient length to allow the specimen to be held securely in the clamps of the tensile tester while performing a 180° “T-peel.” The specimen (with heavy paper leads affixed) is clamped in the tensile tester and the tensile tester's moving crosshead is moved (parallel to the CD dimension of both components) at 305 mm/min until the fastening component and receiving component are separated. The peak force in Newtons is recorded to the nearest 0.1 N as the unscaled specimen peel strength. The unscaled specimen peel strength is then normalized to correspond to an overlap width of 25.4 mm to arrive at the specimen peel strength (in Newtons to the nearest 0.1 N) for that specimen via the equation:
At least five like specimens are analyzed in this way, and the arithmetic mean of all of the specimen peel strength values for all of the specimens is calculated and reported as the CD Peel Strength in units of Newtons to the nearest 0.1 N.
In general, the overall thickness of a fibrous material is measured as follows. Thickness measurements are performed using an Ono Sokki digital caliper (GS-503 Linear Gauge Sensor with DG-3610 Digital Gauge, Ono Sokki Co, Japan or equivalent) capable of measuring to 0.01 millimeters. The circular foot's diameter is 25.4 millimeters and the applied pressure is 0.689 kilopascals. At least five test samples of the same fibrous material are measured. Before testing, each of the test samples is placed on a flat surface and conditioned for 2 hours at 23 ±2° C. and 50 ±2% relative humidity. The measurements are performed under the same environmental conditions. For each test sample, three measurements are made at test sites corresponding to the longitudinal center of the test sample at 25%, 50% and 75% of the total lateral width of the test sample. For each measurement, the test sample is placed onto the caliper's anvil, with the body facing surface directed downward and with the test site centered under the foot. The foot is lowered at about 5 millimeters per second until the foot rests on the test sample. A reading from the caliper is taken after a residence time of 5 seconds and recorded to the nearest 0.01 millimeter. The foot is raised and the measurement is repeated in similar fashion at the other two test sites. The average of all measurements is reported to the nearest 0.01 millimeter. This test method can be used to measure the overall thickness of a fibrous material.
This test method can also be used to measure the overall thickness of a receiving component of a disposable wearable absorbent article. At least five test samples of the same receiving component are measured. Care should be taken to not to significantly stretch or distort the test sample when removing a receiving component from the article. If necessary, a cryogenic freeze spray (available as CytoFreeze, Control Company, TX or equivalent) can be used to facilitate removal of the receiving component.
Opacity by contrast ratio measurements are made using a 0° /45° spectrophotometer suitable for making standard CIE L*a*b* color measurements (e.g. Hunterlab Labscan XE spectrophotometer, Hunter Associates Laboratory Inc., Reston Va. or equivalent). The diameter of the instrument's measurement port should be chosen such that only the region of interest is included within the measurement port. Analyses are performed in a room controlled at about 23° C.±2° C. and 50%±2% relative humidity. Samples are conditioned at the same condition for 2 hours before testing.
Calibrate the instrument per the vendor instructions using the standard black and white tiles provided by the vendor. Set the spectrophotometer to use the CIE XYZ color space, with a D65 standard illumination and 10° observer. Using cryogenic spray and scissors carefully excise the specimen from the article for testing. Place the specimen flat against the instrument with the outward facing surface toward the spectrophotometer's measurement port and the region of interest within the port. Ensure that no tears, holes or apertures are within the measurement port. Place the white standard tile onto the opposing surface of the specimen such that it completely covers the measurement port. Take a reading for XYZ and record to 0.01 units. Without moving the specimen, remove the white plate and replace it with the black standard plate. Take a second reading for XYZ and record to 0.01 units. Repeat this procedure at a corresponding site for a total of ten (10) replicate specimens.
Opacity is calculated by dividing the Y value measured using the black tile as backing, divided by the Y value measured using the white tile as backing. Record the opacity value to the nearest 0.001. Calculate opacity for the 10 replicates for the sample and report the average opacity to the nearest 0.001.
The difference between an opacity of a first sample and a second sample is calculated using the following equation:
wherein sample 2 is the sample having the lower of the two average opacities.
The dimensions and values disclosed herein are not to 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 surrounding that value. For example, a dimension disclosed as “40 mm” is intended to mean “about 40 mm. ”
Every document cited herein, including any cross referenced or related patent or application and any patent application or patent to which this application claims priority or benefit thereof, is hereby incorporated herein by reference in its entirety unless expressly excluded or otherwise limited. The citation of any document is not an admission that it is prior art with respect to any invention disclosed or claimed herein or that it alone, or in any combination with any other reference or references, teaches, 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.
While particular embodiments of the present invention have been illustrated and described, it would be obvious to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.
This application claims the benefit of U.S. Provisional Application No. 62/975,836 filed Feb. 13, 2020 and U.S. Provisional Application No. 63/080,929, filed Sep. 21, 2020, the substances of which are incorporated herein by reference.
| Number | Date | Country | |
|---|---|---|---|
| 63080929 | Sep 2020 | US | |
| 62975836 | Feb 2020 | US |
