The present disclosure is generally directed to absorbent articles comprising laminates exhibiting vibrant graphics perception. The present disclosure is also directed to absorbent articles comprising laminates comprising nonwoven webs with visually discernible patterns in combination with color graphics for improved, overall vibrant graphics perception.
Absorbent articles comprising nonwoven webs are used in the hygiene industry to contain and absorb bodily exudates (i.e., urine, bowel movements, and menses) in infants, toddlers, children, and adults. Absorbent articles may include, but not be limited to, diapers, pants, adult incontinence products, feminine care products, and absorbent pads. Various components of these absorbent articles comprise one or more nonwoven webs. Some example components that comprise nonwoven webs are outer cover nonwoven materials, portions of belts, landing zones, and topsheets, for example. In some instances, one or more graphics are printed on backsheet films of absorbent articles. It is sometimes desirable for these graphics to be viewable through the topsheet or through the outer cover nonwoven materials. When outer cover nonwoven materials or topsheets are planar, non-variable intensive property webs, the graphics are mottled, uniformly muted, and/or uniformly masked to a degree from the view of a consumer observing through the topsheets or the outer cover nonwoven materials. As such, outer cover nonwoven materials, topsheets, and backsheet graphics should be improved.
The present disclosure provides, in part, absorbent articles comprising laminates exhibiting vibrant graphics perception. The present disclosure also provides, in part, absorbent articles comprising laminates comprising nonwoven webs with visually discernible patterns of three-dimensional features in combination with backsheet color graphics for improved, overall vibrant graphics perception. The laminates may comprise one or more nonwoven webs that overlap a backsheet. The nonwoven webs of the present disclosure allow one or more graphics on the backsheet to be more visually vibrant to consumers when viewed through the nonwoven webs. This enhances the consumer experience. The nonwoven webs may be topsheets, portions of belts, landing zones, or outer cover nonwoven materials, for example. The nonwoven webs may comprise variable average intensive property webs. This allows certain portions of the one or more graphics on backsheet to be more or less visually vibrant through the nonwoven webs, creating an enhanced vibrant graphics consumer experience. As an example, the nonwoven webs may comprise one or more visually discernible patterns of three-dimensional features on a first surface or a second surface thereof. At least some of the three-dimensional features may each comprise a first region and a second region. The first regions may have a first value of an average intensive property. The second regions may have a second value of the average intensive property. The first and second values may be different. A portion of the visually discernible pattern of three-dimensional features may overlap the one or more graphics printed on the backsheet to allow regions of the graphics to be more visually vibrant in either the first or second regions. The one or more visually vibrant graphics on the backsheet film greatly increases the perception of the one or more visually discernible patterns of the nonwoven web, when the nonwoven web is overlapped with the one or more visually vibrant graphics.
The present disclosure provides, in part, an absorbent article comprises a liquid permeable topsheet, a liquid impermeable backsheet, an absorbent core positioned at least partially intermediate the topsheet and the backsheet, and an outer cover nonwoven material. The outer cover nonwoven material comprises a first garment-facing surface, a second backsheet-facing surface, and a visually discernible pattern of three-dimensional features on the first surface or the second surface. At least some of the three-dimensional features each comprise a first region and a second region. The first regions have a first value of an average intensive property. The second regions have a second value of the average intensive property. The first value and the second value are different. A garment-facing side of the backsheet comprises one or more visually vibrant graphics. A portion of the visually discernible pattern of three-dimensional features overlaps a portion of the one or more visually vibrant graphics. The portion of the one or more visually vibrant graphics exhibits a chroma value greater than 8, according to the Backsheet Graphic Color Test.
The above-mentioned and other features and advantages of the present disclosure, and the manner of attaining them, will become more apparent and the disclosure itself will be better understood by reference to the following description of example forms of the disclosure taken in conjunction with the accompanying drawings, wherein:
Various non-limiting forms of the present disclosure will now be described to provide an overall understanding of the principles of the structure, function, manufacture, and use of the absorbent articles having laminates exhibiting vibrant graphics perception disclosed herein. One or more examples of these non-limiting forms are illustrated in the accompanying drawings. Those of ordinary skill in the art will understand that the absorbent articles having laminates exhibiting vibrant graphics perception described herein and illustrated in the accompanying drawings are non-limiting example forms and that the scope of the various non-limiting forms of the present disclosure are defined solely by the claims. The features illustrated or described in connection with one non-limiting form may be combined with the features of other non-limiting forms. Such modifications and variations are intended to be included within the scope of the present disclosure.
Prior to a discussion of the nonwoven webs with visually discernable patterns and the laminates with visually vibrant graphics perception, absorbent articles and their components and features will be discussed as possible uses of the nonwoven webs. It will be understood that the nonwoven webs with visually discernable patterns and the laminates with visually vibrant graphics perception also have other uses in other products, such as in the medical field and/or the cleaning and/or dusting field, for example.
An example absorbent article 10 according to the present disclosure, shown in the form of a taped diaper, is represented in
The absorbent article 10 may comprise a front waist region 12, a crotch region 14, and a back waist region 16. The crotch region 14 may extend intermediate the front waist region 12 and the back waist region 16. The front wait region 12, the crotch region 14, and the back waist region 16 may each be ⅓ of the length of the absorbent article 10. The absorbent article 10 may comprise a front end edge 18, a back end edge 20 opposite to the front end edge 18, and longitudinally extending, transversely opposed side edges 22 and 24 defined by the chassis 52.
The absorbent article 10 may comprise a liquid permeable topsheet 26, a liquid impermeable backsheet 28, and an absorbent core 30 positioned at least partially intermediate the topsheet 26 and the backsheet 28. The absorbent article 10 may also comprise one or more pairs of barrier leg cuffs 32 with or without elastics 33, one or more pairs of leg elastics 34, one or more elastic waistbands 36, and/or one or more acquisition materials 38. The acquisition material or materials 38 may be positioned intermediate the topsheet 26 and the absorbent core 30. An outer cover nonwoven material 40, such as a nonwoven web, may cover a garment-facing side of the backsheet 28. The absorbent article 10 may comprise back ears 42 in the back waist region 16. The back ears 42 may comprise fasteners 46 and may extend from the back waist region 16 of the absorbent article 10 and attach (using the fasteners 46) to the landing zone area or landing zone material 44 on a garment-facing portion of the front waist region 12 of the absorbent article 10. The absorbent article 10 may also have front ears 47 in the front waist region 12. Instead of two front ears 47, the absorbent article 10 may have a single piece front belt that may function as a landing zone as well. The absorbent article 10 may have a central lateral (or transverse) axis 48 and a central longitudinal axis 50. The central lateral axis 48 extends perpendicular to the central longitudinal axis 50.
In other instances, the absorbent article may be in the form of a pant having permanent or refastenable side seams. Suitable refastenable seams are disclosed in U.S. Pat. Appl. Pub. No. 2014/0005020 and U.S. Pat. No. 9,421,137. Referring to
Referring to
The front and back inner belt layers 66, 67 and the front and back outer belt layers 64, 65 may be joined using adhesives, heat bonds, pressure bonds or thermoplastic bonds. Various suitable belt layer configurations can be found in U.S. Pat. Appl. Pub. No. 2013/0211363.
Front and back belt end edges 55 and 57 may extend longitudinally beyond the front and back chassis end edges 19 and 21 (as shown in
As disclosed in U.S. Pat. No. 7,901,393, the longitudinal length (along the central longitudinal axis 50) of the back belt 56 may be greater than the longitudinal length of the front belt 54, and this may be particularly useful for increased buttocks coverage when the back belt 56 has a greater longitudinal length versus the front belt 54 adjacent to or immediately adjacent to the side seams 58.
The front outer belt layer 64 and the back outer belt layer 65 may be separated from each other, such that the layers are discrete or, alternatively, these layers may be continuous, such that a layer runs continuously from the front belt end edge 55 to the back belt end edge 57. This may also be true for the front and back inner belt layers 66 and 67—that is, they may also be longitudinally discrete or continuous. Further, the front and back outer belt layers 64 and 65 may be longitudinally continuous while the front and back inner belt layers 66 and 67 are longitudinally discrete, such that a gap is formed between them—a gap between the front and back inner and outer belt layers 64, 65, 66, and 67 is shown in
The front and back belts 54 and 56 may include slits, holes, and/or perforations providing increased breathability, softness, and a garment-like texture. Underwear-like appearance can be enhanced by substantially aligning the waist and leg edges at the side seams 58 (see
The front and back belts 54 and 56 may comprise graphics (see e.g., 78 of
Alternatively, instead of attaching belts 54 and 56 to the chassis 52 to form a pant, discrete side panels may be attached to side edges of the chassis 22 and 24.
The nonwoven webs with visually discernable patterns may be used as portions of belts positioned over one or more visually vibrant graphics on a backsheet film to achieve the benefits of the present disclosure.
The topsheet 26 is the part of the absorbent article 10 that is in contact with the wearer's skin. The topsheet 26 may be joined to portions of the backsheet 28, the absorbent core 30, the barrier leg cuffs 32, and/or any other layers as is known to those of ordinary skill in the art. The topsheet 26 may be compliant, soft-feeling, and non-irritating to the 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 webs, woven or nonwoven webs 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 (
The nonwoven webs with visually discernable patterns may be used as topsheets positioned over one or more visually vibrant graphics on a backsheet film to achieve the benefits of the present disclosure.
The backsheet 28 is generally that portion of the absorbent article 10 positioned proximate to the garment-facing surface of the absorbent core 30. The backsheet 28 may be joined to portions of the topsheet 26, the outer cover nonwoven material 40, the absorbent core 30, and/or any other layers of the absorbent article by any attachment methods known to those of skill in the art. The backsheet 28 prevents, or at least inhibits, the bodily exudates absorbed and contained in the absorbent core 10 from soiling articles such as bedsheets, undergarments, and/or clothing. The backsheet is typically liquid impermeable, or at least substantially liquid 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 materials may include breathable materials which permit vapors to escape from the absorbent article, while still preventing, or at least inhibiting, bodily exudates from passing through the backsheet. The backsheet may comprise one or more visually vibrant graphics on either a wearer and/or garment facing side thereof.
The outer cover nonwoven material (sometimes referred to as a backsheet nonwoven) 40 may comprise one or more nonwoven materials joined to the backsheet 28 and that covers the backsheet 28. The outer cover nonwoven material 40 forms at least a portion of the garment-facing surface 2 of the absorbent article 10 and effectively “covers” the backsheet 28 so that film is not present on the garment-facing surface 2.
The nonwoven webs with visually discernable patterns may be used as an outer cover nonwoven material positioned over one or more visually vibrant graphics on a backsheet film to achieve the benefits of the present disclosure.
As used herein, the term “absorbent core” 30 refers to the component of the absorbent article 10 having the most absorbent capacity and that comprises an absorbent material. Referring to
Referring to
Referring to
Referring to
The nonwoven webs with visually discernable patterns may be used as portions of waist bands positioned over one or more visually vibrant graphics on a backsheet film to achieve the benefits of the present disclosure.
Referring to
Referring to
The nonwoven webs with visually discernable patterns may be used as landing zones positioned over one or more visually vibrant graphics on a backsheet film to achieve the benefits of the present disclosure.
Referring to
Referring to
Referring again to
The absorbent articles of the present disclosure may be placed into packages. The packages may comprise nonwoven webs, polymeric films, and/or other materials. Graphics and/or indicia relating to properties of the absorbent articles may be formed on, printed on, positioned on, and/or placed on outer portions of the packages. Each package may comprise a plurality of absorbent articles. The absorbent articles may be packed under compression so as to reduce the size of the packages, while still providing an adequate number of absorbent articles per package. By packaging the absorbent articles under compression, caregivers can easily handle and store the packages, while also providing distribution savings to manufacturers owing to the size of the packages. The nonwoven webs with visually discernable patterns and improved texture perception may be used as nonwoven components of the packages, or portions thereof.
Referring to
The nonwoven webs with visually discernable patterns may be used as a topsheet of a sanitary napkin positioned over one or more visually vibrant graphics on a backsheet film to achieve the benefits of the present disclosure. In an instance, overlap of the visually discernable pattern and the one or more visually vibrant graphics may occur in the wings. Since an absorbent core or secondary topsheet may not be present in the wings, visually vibrant graphics perception in the wings through the topsheet may be improved.
Nonwoven Webs with Visually Discernible Patterns
The nonwoven webs with one or more visually discernable patterns are now discussed. The nonwoven webs disclosed herein are not soluble in liquids, such as water. The visually discernable patterns may be formed by three-dimensional features. Such nonwoven webs may be used as various components of, or portions of components of, absorbent articles, such as topsheets, topsheet portions of wings of sanitary napkins, outer cover nonwoven materials, portions of belts, waistbands, and/or landing zones, for example.
Any of the nonwoven webs of the present disclosure may be through-air bonded such that bonds occur at individual fiber intersections as hot air is passed through the nonwoven webs. Through-air bonding may help maintain softness in the nonwoven webs compared to more conventional calendar bonding. Other methods of bonding may include calendar point bonding, ultrasonic bonding, latex bonding, hydroentanglement, resin bonding, and/or combinations thereof.
Any of the nonwoven webs of the present disclosure may comprise portions of, or all of, components of absorbent articles. An absorbent article, as discussed above, may comprise a liquid permeable topsheet, a liquid impermeable backsheet, and an absorbent core positioned at least partially intermediate the topsheet and the backsheet. The absorbent article may comprise an outer cover nonwoven material forming at least a portion of a garment-facing surface of the absorbent article. The outer cover nonwoven material and/or the topsheet may comprise the nonwoven webs of the present disclosure. Other components of absorbent articles, or portions thereof, may also comprise the nonwoven webs of the present disclosure, such as belts, landing zones, wings of sanitary napkins, and/or waistbands, for example.
A nonwoven web for an absorbent article is provided. The nonwoven web may form a portion of the laminates of the present disclosure in combination with at least a backsheet film with one or more visually vibrant graphics. The nonwoven web may comprise a first surface, a second surface, and a visually discernible pattern of three-dimensional features on the first surface or the second surface. The three-dimensional features may comprise first regions and second regions. The first regions may be different than the second regions in a value of an average intensive property, wherein the average intensity property is basis weight, volumetric density, and/or caliper. The first regions may form about 5% to about 40%, about 10% to about 35%, about 10% to about 30%, or about 10% to about 25% of the nonwoven webs, relative to a total area of the nonwoven webs, and with the second regions forming the remainder of the nonwoven webs, specifically reciting all 1% increments within the specified ranges and all ranges formed therein or thereby.
The nonwoven webs comprising the visually discernable patterns of three-dimensional features may have a basis weight in the range of about 10 gsm to about 100 gsm, about 10 gsm to about 60 gsm, about 15 gsm to about 50 gsm, about 15 gsm to about 45 gsm, about 20 gsm to about 40 gsm, about 20 gsm to about 35 gsm, about 20 gsm to about 30 gsm, according to the Basis Weight Test herein, and specifically reciting all 0.1 gsm increments within the specified ranges and all ranges formed therein or thereby.
The visually discernable pattern of three-dimensional features may be formed in a nonwoven web by embossing, hydroentangling, or by using a structured forming belt for fiber laydown. Using embossing or hydroentangling, the first regions or the second regions may be embossed or hydroentangled to form the pattern. The structured forming belt is discussed herein.
The nonwoven webs of the present disclosure may be formed by a dry-laid process using short staple fibers and mechanical web formation, such as a carding process. The resulting webs may be bonded using irregular pattern thermal embossing or hydroforming/hydroentangling processes. The nonwoven webs may also comprise cotton or other natural fibers. The nonwoven webs of the present disclosure may also be coform webs. Coformed webs typically comprise a matrix of meltblown fibers mixed with at least one additional fibrous organic materials, such as fluff pulp, cotton, and/or rayon, for example. The coform webs may be further structured by embossing or laying down the composite on a structured belt during a coforming process. In an instance, continuous spunbond filaments are used in producing the nonwoven webs if the nonwoven webs are being made on a structured forming belt (as described below). The nonwoven webs may comprise continuous mono-component polymeric filaments comprising a primary, polymeric component. The nonwoven webs may comprise continuous multicomponent polymeric filaments comprising a primary polymeric component and a secondary polymeric component. The filaments may be continuous bicomponent filaments comprising a primary polymeric component A and a secondary polymeric component B. The bicomponent filaments have a cross-section, a length, and a peripheral surface. The components A and B may be arranged in substantially distinct zones across the cross-section of the bicomponent filaments and may extend continuously along the length of the bicomponent filaments. The secondary component B constitutes at least a portion of the peripheral surface of the bicomponent filaments continuously along the length of the bicomponent filaments. The polymeric components A and B may be melt spun into multicomponent fibers on conventional melt spinning equipment. The equipment may be chosen based on the desired configuration of the multicomponent. Commercially available melt spinning equipment is available from Hills, Inc. located in Melbourne, Fla. The temperature for spinning is in the range of about 180° C. to about 230° C. The bicomponent spunbond filaments may have an average diameter from about 6 microns to about 40 microns or from about 12 microns is about 40 microns, for example.
The components A and B may be arranged in either a side-by-side arrangement as shown in
A wide variety of polymers are suitable to practice the present disclosure including polyolefins (such as polyethylene, polypropylene and polybutylene), polyesters, polyamides, polyurethanes, elastomeric materials and the like. Non-limiting examples of polymer materials that can be spun into filaments include natural polymers, such as starch, starch derivatives, cellulose and cellulose derivatives, hemicellulose, hemicelluloses derivatives, chitin, chitosan, polyisoprene (cis and trans), peptides, polyhydroxyalkanoates, and synthetic polymers including, but not limited to, thermoplastic polymers, such as polyesters, nylons, polyolefins such as polypropylene, polyethylene, polyvinyl alcohol and polyvinyl alcohol derivatives, sodium polyacrylate (absorbent gel material), and copolymers of polyolefins such as polyethylene-octene or polymers comprising monomeric blends of propylene and ethylene, and biodegradable or compostable thermoplastic polymers such as polylactic acid filaments, polyvinyl alcohol, filaments, and polycaprolactone filaments. In one example, thermoplastic polymer selected from the group of: polypropylene, polyethylene, polyester, polylactic acid, polyhydroxyalkanoate, polyvinyl alcohol, polycaprolactone, styrene-butadiene-styrene block copolymer, styrene-isoprene-styrene block copolymer, polyurethane, and mixtures thereof. In another example, the thermoplastic polymer is selected from the group consisting of: polypropylene, polyethylene, polyester, polylactic acid, polyhydroxyalkanoate, polyvinyl alcohol, polycaprolactone, and mixtures thereof. Alternatively, the polymer can comprise one derived from monomers which are bin-based such as bio-polyethylene, bio-polypropylene, bio-PET, or PLA, for example.
Primary component A and secondary component B may be selected so that the resulting bicomponent filament provides improved nonwoven bonding and softness. Primary polymer component A may have melting temperature which is lower than the melting temperature of secondary polymer component B.
Primary polymer component A may comprise polyethylene, polypropylene or random copolymer of propylene and ethylene. Secondary polymer component B may comprise polypropylene or random copolymer of propylene and ethylene. Polyethylenes may comprise linear low density polyethylene and high density polyethylene. In addition, secondary polymer component B may comprise polymers, additives for enhancing the natural helical crimp of the filaments, lowering the bonding temperature of the filaments, and enhancing the abrasion resistance, strength and softness of the resulting fabric.
Inorganic fillers, such as the oxides of magnesium, aluminum, silicon, and titanium, for example, may be added as inexpensive fillers or processing aides, Pigments and/or color melt additives may also be added.
The fibers of the nonwoven webs disclosed herein may comprise a slip additive in an amount sufficient to impart the desired haptics to the fiber. As used herein, “slip additive” or “slip agent” means an external lubricant. The slip agent when melt-blended with the resin gradually exudes or migrates to the surface during cooling or after fabrication, hence forming a uniform, invisibly thin coating, thereby yielding permanent lubricating effects. The slip agent may be a fast bloom slip agent.
During the making or in a post-treatment or even in both, the nonwoven webs of the present disclosure may be treated with surfactants or other agents to either hydrophilize the web or make it hydrophobic. For example, a nonwoven web used as a topsheet may be treated with a hydrophilizing material or surfactant so as to make it permeable to body exudates, such as urine and menses. For other absorbent articles, the nonwoven webs may remain in their naturally hydrophobic state or made even more hydrophobic through the addition of a hydrophobizing material or surfactant.
Suitable materials for preparing the multicomponent filaments of the nonwoven webs of the present disclosure may comprise PP3155 polypropylene obtained from Exxon Mobil Corporation and PP3854 polypropylene obtained from Exxon Mobil Corporation.
As mentioned above, the nonwoven webs of the present disclosure may be produced by embossing, hydroentangling, or by using a structured forming belt for fiber or filament laydown. The structured forming belt and the process of manufacture will now be described in more detail. The nonwoven webs may be formed directly on the structured forming belt with continuous spunbond filaments in a single forming process. The nonwoven webs may assume a shape and texture which corresponds to the shape and texture of the structured forming belt.
The present disclosure may utilize the process of melt spinning. Melt spinning may occur from about 150° C. to about 280° or from about 190° to about 230°, for example. Fiber spinning speeds may be greater than 100 meters/minute, from about 1,000 to about 10,000 meters/minute, from about 2,000 to about 7,000 meters/minute, or from about 2,500 to about 5,000 meters/minute, for example. Spinning speeds may affect the brittleness of the spun fiber, and, in general, the higher the spinning speed, the less brittle the fiber. Continuous fibers may be produced through spunbond methods or meltblowing processes.
Referring to
The process line 330 may comprise a pair of extruders 332 and 334 driven by extruder drives 331 and 333, respectively, for separately extruding the primary polymer component A and the secondary polymer component B. Polymer component A may be fed into the respective extruder 332 from a first hopper 336 and polymer component B may be fed into the respective extruder 334 from a second hopper 338. Polymer components A and B may be fed from the extruders 332 and 334 through respective polymer conduits 340 and 342 to filters 344 and 345 and melt pumps 346 and 347, which pump the polymer into a spin pack 348. Spinnerets for extruding bicomponent filaments are generally known to those of ordinary skill in the art.
Generally described, the spin pack. 348 comprises a housing which comprises a plurality of plates stacked one on top of the other with a pattern of openings arranged to create flow paths for directing polymer components A and B separately through the spinneret. The spin pack 348 has openings arranged in one or more rows. The spinneret openings form a downwardly extending curtain of filaments when the polymers are extruded through the spinneret. For the purposes of the present disclosure, spinnerets may be arranged to form side-by-side, eccentric sheath/core, or sheath/core bicomponent filaments as illustrated in
The process line 330 may comprises a quench blower 350 positioned adjacent to the curtain of filaments extending from the spinneret. Air from the quench air blower 350 may quench the filaments extending from the spinneret. The quench air may be directed from one side of the filament curtain or both sides of the filament curtain.
An attenuator 352 may be positioned below the spinneret and receives the quenched filaments. Fiber draw units or aspirators for use as attenuators in melt spinning polymers are generally known to those of skill in the art. Suitable fiber draw units for use in the process of forming the nonwoven webs of the present disclosure may comprise a linear fiber attenuator of the type shown in U.S. Pat. No. 3,802,817 and eductive guns of the type shown in U.S. Pat. Nos. 3,692,618 and 3,423,266.
Generally described, the attenuator 352 may comprise an elongate vertical passage through which the filaments are drawn by aspirating air entering from the sides of the passage and flowing downwardly through the passage. A structured, endless, at least partially foraminous, forming belt 360 may be positioned below the attenuator 352 and may receive the continuous filaments from the outlet opening of the attenuator 352. The forming belt 360 may travel around guide rollers 362. A vacuum 364 positioned below the structured forming belt 360 where the filaments are deposited draws the filaments against the forming surface. Although the forming belt 360 is shown as a belt in
In operation of the process line 330, the hoppers 336 and 338 are filled with the respective polymer components A and B. Polymer components A and B are melted and extruded by the respective extruders 332 and 334 through polymer conduits 340 and 342 and the spin pack 348. Although the temperatures of the molten polymers vary depending on the polymers used, when polyethylenes are used as primary component A and secondary component B respectively, the temperatures of the polymers may range from about 190° C. to about 240° C., for example.
As the extruded filaments extend below the spinneret, a stream of air from the quench blower 350 at least partially quench the filaments, and, for certain filaments, to induce crystallization of molten filaments. The quench air may flow in a direction substantially perpendicular to the length of the filaments at a temperature of about 0° C. to about 35″ C and a velocity from about 100 to about 400 feet per minute. The filaments may be quenched sufficiently before being collected on the forming bell 360 so that the filaments may be arranged by the forced air passing through the filaments and the forming belt 360. Quenching the filaments reduces the tackiness of the filaments so that the filaments do not adhere to one another too tightly before being bonded and may be moved or arranged on the forming belt 360 during collection of the filaments on the forming belt 360 and formation of the nonwoven web.
After quenching, the filaments are drawn into the vertical passage of the attenuator 352 by a flow of the fiber draw unit. The attenuator may be positioned 30 to 60 inches below the bottom of the spinneret.
The filaments may be deposited through the outlet opening of the attenuator 352 onto the shaped, traveling forming belt 360. As the filaments are contacting the forming surface of the forming belt 360, the vacuum 364 draws the air and filaments against the forming belt 360 to form a nonwoven web of continuous filaments which assumes a shape corresponding to the shape of the structured forming surface of the structured forming belt 360. As discussed above, because the filaments are quenched, the filaments are not too tacky and the vacuum may move or arrange the filaments on the forming belt 360 as the filaments are being collected on the forming belt 330 and formed into nonwoven webs.
The process line 330 may comprise one or more bonding devices such as the cylinder-shaped compaction rolls 370 and 372, which form a nip through which the nonwoven web may be compacted (e.g., calendared) and which may be heated to bond fibers as well. One or both of compaction rolls 370, 372 may be heated to provide enhanced properties and benefits to the nonwoven webs by bonding portions of the nonwoven webs. For example, it is believed that heating sufficient to provide thermal bonding improves the nonwoven web's tensile properties. The compaction rolls may be pair of smooth surface stainless steel rolls with independent heating controllers. The compaction rolls may be heated by electric elements or hot oil circulation. The gap between the compaction rolls may be hydraulically controlled to impose desired pressure on the nonwoven web as it passes through the compaction rolls on the forming belt. As an example, with a forming belt caliper of 1.4 mm, and a spunbond nonwoven web having a basis weight of 25 gsm, the nip gap between the compaction rolls 370 and 372 may be about 1.4 mm.
An upper compaction roll 370 may be heated sufficiently to consolidate or melt fibers on a first surface of a nonwoven web 310, to impart strength to the nonwoven web so that it may be removed from forming belt 360 without losing integrity. As shown in
The raised elements of the forming belt 360 may be selected to establish various network characteristics of the forming belt and the bonded regions of the nonwoven web 310. The network corresponds to resin making up the raised elements of the forming belt 360 and may comprise substantially continuous, substantially semi-continuous, discontinuous, or combinations thereof options. These networks may be descriptive of the raised elements of the forming belt 360 as it pertains to their appearance or make-up in the X-Y planes of the forming belt 360 or the three-dimensional features of the nonwoven webs 310.
After compaction, the nonwoven web 310 may leave the forming belt 360 and be calendared through a nip formed by calendar rolls 371, 373, after which the nonwoven web 310 may be wound onto a reel 375 or conveyed directly into a manufacturing operation for products, such as absorbent articles. As shown in the schematic cross-section of
“Point bonding”, as used herein, is a method of thermally bonding a nonwoven web. This method comprises passing a web through a nip between two rolls comprising a heated male patterned or engraved metal roll and a smooth or patterned metal roll. The male patterned roll may have a plurality of raised, generally cylindrical-shaped pins that produce circular point bonds. The smooth roll may or may not be heated, depending on the application. In a nonwoven manufacturing line, the nonwoven web, which could be a non-bonded nonwoven web, is fed into the calendar nip and the fiber temperature is raised to the point for fibers to thermally fuse with each other at the tips of engraved points and against the smooth roll. The heating time is typically in the order of milliseconds. The nonwoven web properties are dependent on process settings such as roll temperatures, web line speeds, and nip pressures, all of which may be determined by the skilled person for the desired level of point bonding. Other types of point bonding known generally as hot calendar bonding may use different geometries for the bonds (other than circular shaped), such as oval, lines, circles, for example. In an example, the point bonding produces a pattern of point bonds being 0.5 mm diameter circles with 10% overall bonding area. Other bonding shapes may have raised pins having a longest dimension across the bonding surface of a pin of from about 0.1 mm to 2.0 mm and the overall bonding area ranges from about 5% to about 30%, for example.
As shown in
The forming belt 360 may be made according to the methods and processes described in U.S. Pat. No. 6,610,173, issued to Lindsay et al., on Aug. 26, 2003, or U.S. Pat. No. 5,514,523, issued to Trokhan et al., on May 7, 1996, or U.S. Pat. No. 6,398,910, issued to Burazin et al., on Jun. 4, 2002, or U.S. Pat. No. 8,940,376, issued to Stage et al on Jan. 27, 2015, each with the improved features and patterns disclosed herein for making spunbond nonwoven webs. The Lindsay, Trokhan, Burazin, and Stage disclosures describe structured forming belts that are representative of papermaking belts made with cured resin on a woven reinforcing member, which belts, with improvements, may be utilized to form the nonwoven webs of the present disclosure as described herein.
An example of a structured forming belt 360, and which may be made according to the disclosure of U.S. Pat. No. 5,514,523, is shown in
The forming belt 360 may comprise cured resin elements 392 on a woven reinforcing member 394. The reinforcing member 394 may be made of woven filaments 396 as is generally known in the art of papermaking belts, including resin coated papermaking belts. The cured resin elements may have the general structure depicted in
The nonwoven webs disclosed herein may be fluid permeable. The entire nonwoven web may be considered fluid permeable or some regions may be fluid permeable. By fluid permeable, as used herein, with respect to the nonwoven web is meant that the nonwoven web has at least one region which permits liquid to pass through under in-use conditions of a consumer product or absorbent article. For example, if used as a topsheet on a disposable absorbent article, the nonwoven web may have at least one zone having a level of fluid permeability permitting urine to pass through to an underlying absorbent core. By fluid permeable, as used herein with respect to a region, it is meant that the region exhibits a porous structure that permits liquid to pass through.
Because of the nature of the structured forming belts and other apparatus elements, as described herein, the three-dimensional features of the nonwoven web have average intensive properties that may differ between first and second regions, or from feature to feature in ways that provide for beneficial properties of the nonwoven web when used in personal care articles, garments, medical products, and cleaning products. For example, a first region may have a basis weight or density that is different from the basis weight or density of a second region, and both may have a basis weight or density that is different from that of a third region, providing for beneficial aesthetic and functional properties related to fluid acquisition, distribution and/or absorption in diapers or sanitary napkins.
The average intensive property differential between the various regions of the nonwoven webs is believed to be due to the fiber distribution and compaction resulting from the apparatus and method described herein. The fiber distribution occurs during the fiber laydown process, as opposed to, for example, a post making process such as embossing processes. Because the fibers are free to move during a process such as a melt, spinning process, with the movement determined by the nature of the features and air permeability of the forming belt and other processing parameters, the fibers are believed to be more stable and permanently formed in nonwoven web.
In structured forming belts having multiple zones, the air permeability in each zone may be variable such that the intensive properties of average basis weight and average volumetric density in the zones may be varied. Variable air permeabilities in the various zones causes fiber movement during laydown. The air permeability may be between about 400 to about 1000 cfm, or between about 400 to about 800 cfm, or between about 500 cfm and about 750 cfm, or between about 650 to about 700 cfm, specifically reciting all 1 cfm increments within the specified ranges and all ranges formed therein or thereby.
A structured forming belt may comprise an endless foraminous member comprising a first surface and a second surface, a curable resin extending from the first surface of the foraminous member, and a visually discernible pattern of three-dimensional features on the endless foraminous member. The three-dimensional features may comprise one or more first regions and a plurality of second regions. The one or more first regions may comprise the resin and the plurality of second regions may be free of the resin.
Components of the disposable absorbent article (i.e., diaper, disposable pant, adult incontinence article, sanitary napkin, pantiliner, etc.) described in this specification may at least partially be comprised of bio-sourced content as described in U.S. Pat. Appl. Publ. No. 2007/0219521A1 Hird et al., published on Sep. 20, 2007, U.S. Pat. Appl. Publ. No. 2011/0139658A1 Hird et al., published on Jun. 16, 2011, U.S. Pat. Appl. Publ. No. 2011/0139657A1 Hird et al., published on Jun. 16, 2011, U.S. Pat. Appl. Publ. No 2011/0152812A1 Hird et al., published on Jun. 23, 2011, U.S. Pat. Appl. Publ. No. 2011/0139662A1 Hird et al., published on Jun. 16, 2011, and U.S. Pat. Appl. Publ. No. 2011/0139659A1 Hird et al., published on Jun. 16, 2011. These components include, but are not limited to, topsheet nonwovens, backsheet films, backsheet nonwovens, side panel nonwovens, barrier leg cuff nonwovens, super absorbents, nonwoven acquisition layers, core wrap nonwovens, adhesives, fastener hooks, and fastener landing zone nonwovens and film bases.
In some forms, a disposable absorbent article component comprises a bio-based content value from about 10% to about 100% using ASTM D6866-10, method B, in another embodiment, from about 25% to about 75%, and in yet another embodiment, 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 disposable absorbent article component, a representative sample of the disposable absorbent article component must be obtained for testing. In a form, the disposable absorbent article component may 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.
Nonwoven webs may comprise multicomponent fibers or bicomponent fibers, where at least one or more of the components are bio-based. Examples include side-by-side, sheath/core, or islands in the sea configurations, where one or more or all of the components are bio-based.
The nonwoven webs may comprise bonds at fiber intersections formed by passing hot air through the nonwoven webs and using a process referred to as through-air bonding. In other instances, the nonwoven webs may comprise calendar bonds configured to join the fibers together.
The nonwoven web of the present disclosure may comprise a second, visually discernible pattern of three-dimensional features on the first surface or the second surface. The second, visually discernible pattern of three-dimensional features may be different than the visually discernible pattern. The three-dimensional features may comprise one or more, or a plurality of, third regions and a plurality of fourth regions. The one or more third regions may be different than the plurality of fourth regions in a value of an average intensive property, such as basis weight, caliper, and/or volumetric density.
The nonwoven webs of the present disclosure may comprise multicomponent fibers, such as bicomponent fibers (see e.g.,
The nonwoven webs may be spunbond nonwoven webs or carded nonwoven webs.
The nonwoven webs of the present disclosure may comprise a low level of colorant, additive, and/or dye to help with texture perception, absorbency perception, and softness perception. The low level of the colorant, additive, and/or dye may be low enough so that the nonwoven webs appear to still be “white” to the human eye. For example, if a teal colorant, additive, and/or dye is used, the resulting nonwoven material will still appear to be white to the human eye, but texture in the nonwoven web will be more enhanced when viewed. This leads to improved perceptions of absorbency and softness.
As an example, a colorant masterbatch may be used that is a solid additive that comprises pigments typically in the range of about 15% to about 65% actives with a carrier resin, such as polypropylene, polyethylene, and/or polyester. The colorant masterbatch is designed to deliver certain target color which is described as a “let-down ratio”. For example, in nonwoven webs, a masterbatch at 2% let-down ratio will result in a target color when 2% of the masterbatch is blended with 98% of the corresponding nonwoven resin, such as polypropylene, polyethylene, and/or polyester, for example. A conventional let-down ratio may be in the range of about 1.5% to about 5%. This level of let-down ratio, however, causes the nonwoven webs to appear as colored to the human eye, such as teal, for example. In the present disclosure, the add-on levels of the masterbatch are significantly lower for enhancing the texture perception, absorbency perception, and softness perception, without the color being visible to the human eye (i.e., the nonwoven web still appears to be white).
An example colorant may be purchased from Ampacet Corporation located at 660 White Plans Rd. Tarrytown, N.Y. 10591. One example colorant is blue colorant from Ampacet Corporation under the product name Ampacet 4600664-N.
In addition to providing improved texture perception, the nonwoven webs of the present disclosure provide improved softness and texture. The present disclosure further solves the contradiction between high softness and high visible texture. Softness, texture (i.e., smoothness), and/or stiffness may be measured by an Emtec Tissue Softness Analyzer, according to the Emtec Test herein. Tactile softness is measured as TS7. Texture/Smoothness is measured as TS750. Stiffness is measured as D.
A portion of, or all of, the nonwoven webs of the present disclosure may have a TS7 value less than 15 dB V2 or in the range of about 1 dB V2 rms to about 4.5 dB V2 rms, about 2 dB V2 rms to about 4.5 dB V2 rms, or about 2 dB V2 rms to about 4.0 dB V2 rms. The portion of, or all of, the nonwoven webs of the present disclosure may also have a TS750 value in the range of about 4 dB V2 rms to about 30 dB V2 rms, about 6 dB V2 rms to about 30 dB V2 rms, about 6 dB V2 rms to about 20 dB V2 rms, about 6 dB V2 rms to about 15 dB V2 rms, about 6 dB V2 rms to about 12 dB V2 rms, or about 6.5 dB V2 rms to about 10 dB V2 rms. The portion of, or all of, the wearer-facing surfaces of the topsheets of the present disclosure may also have a D value in the range of about 1 mm/N to about 10 mm/N, about 3 mm/N to about 8 mm/N, about 2 mm/N to about 6 mm/N, about 2 mm/N to about 4 mm/N, or about 3 mm/N to about 4 mm/N. All values are measured according to the Emtec Test herein. The TS7 value is tactile softness, so low numbers are desired (the lower the number, the more soft the material is). The TS750 value is texture so a high number is desired (the higher the number, the more texture the material has). Having a low TS7 value and a high texture value is contradictory in that typically the more texture a nonwoven fabric has, the less soft it is. The Applicants, without wishing to be bound by theory, have discovered the unexpected results of highly textured nonwoven fabrics that still are very soft.
The laminates of the present disclosure may comprise one or more of the nonwoven webs discussed herein having the one or more visually discernible patterns of three dimensional features and a backsheet film comprising one or more visually vibrant graphics on the garment-facing side or the wearer-facing side thereof. The one or more visually vibrant graphics on the backsheet film greatly increases the perception of the one or more visually discernible patterns of the nonwoven web, when the nonwoven web is overlapped with the one or more graphics. The laminates may also comprise other materials. A portion of, or all of, the visually discernible pattern of three-dimensional features may overlap a portion of, or all of, the one or more graphics. One example laminate is an outer cover nonwoven material positioned over a backsheet film having one or more graphics printed on a garment-facing side of the backsheet. Another example is a topsheet positioned over a backsheet film having one or more graphics printed on a wearer-facing side of the backsheet. In some instances, the topsheet may overlap the one or more graphics of the backsheet film at least in wings of a sanitary napkin to form the laminate.
The garment-facing or wearer-facing side of the backsheet may comprise one or more graphics. The one or more graphics may comprise visually vibrant graphics. The visually vibrant graphics may be characterized by chroma, L*, a*, b* color values, L* values, a* values, or b* values, as will be discussed further herein. The one or more graphics may be a flood of the same or different colors. The flood may cover all of one surface of the backsheet or portions thereof. In other instances, many different graphics may be provided, although some may repeat. The one or more graphics may comprise a color, a word, a slogan, a brand name, a wetness indicator (or portion thereof), a design, an icon, a logo, a letter, a heart, a number, a size indicator, a front/back indicator, a character, an animal, a face, a symbol, or the like. Graphics may also comprise a visible placement indicia to indicate where a sensor should be attached to the diaper, such as a dashed outline that matches the shape of a sensor, for example. Graphics may be anything that is printed on the backsheet. Graphics may also be tinted areas of the backsheet. The wearer-facing surface or the garment-facing surface of the backsheet may have a non-printed area, a non-tinted area, or an area not covered by the one or more graphics in the range of about 5% to about 90%, about 5% to about 80%, about 10% to about 80%, about 10% to about 70%, about 20% to about 70%, for example, specifically including all 1% increments within the recited ranges and all ranges formed therein or thereby.
Chroma values are a measure of the vividness or vibrancy of color in a backsheet graphic. The one or more visually vibrant graphics may have a chroma value greater than 8 and less than 100, or greater than 8 and less than 90, according to the Backsheet Graphic Color Test herein. The chroma value for the one or more graphics may also be in the range of about 10 to about 95, about 10 to about 90, about 15 to about 80, about 20 to about 75, about 10 to about 60, or about 10 to about 50, according to the Backsheet Graphic Color Test herein. The chroma value for the one or more graphics may also be in the range of about 10 to about 45, about 19 to about 45, about 13 to about 45, about 13, about 14, about 27, about 28, about 35, about 36, about 37, about 40, or about 41, according to the Backsheet Graphic Color Test herein. All 0.5 increments within the recited ranges in this paragraph and all ranges formed therein or thereby are specifically included.
The PANTONE color system uses a color numbering system to identify and match colors.
One or more graphics on the backsheet that are a PANTONE color of 109 may have a chroma value in the range of about 5 to about 90, about 8 to about 90, about 18 to about 90, about 18 to about 84, about 27 to about 77, about 37 to about 66, or about 47 to about 56, according the Backsheet Graphic Color Test herein, and specifically reciting all 0.5 increments within the specified ranges and all ranges formed therein or thereby.
One or more graphics on the backsheet that are a PANTONE color of 171 may have a chroma value in the range of about 15 to about 80, about 19 to about 75, about 26 to about 65, about 34 to about 57, or about 42 to about 49, according the Backsheet Graphic Color Test herein, and specifically reciting all 0.5 increments within the specified ranges and all ranges formed therein or thereby.
One or more graphics on the backsheet that are a PANTONE color of 2965 may have a chroma value in the range of about 5 to about 30, about 7 to about 25, about 7 to about 21, about 8 to about 20, about 11 to about 18, about 13 to about 17, or about 13 to about 15, according the Backsheet Graphic Color Test herein, and specifically reciting all 0.5 increments within the specified ranges and all ranges formed therein or thereby.
One or more graphics on the backsheet that are a PANTONE color of 3272 may have a chroma value in the range of about 10 to about 70, about 11 to about 65, about 18 to about 65, about 25 to about 55, about 30 to about 50, about 31 to about 46, or about 31 to about 40, according the Backsheet Graphic Color Test herein, and specifically reciting all 0.5 increments within the specified ranges and all ranges formed therein or thereby.
Chroma Values PANTONE Color 423
One or more graphics on the backsheet that are a PANTONE color of 423 may have a chroma value in the range of about 1 to about 5, about 1 to about 3, about 1 to about 2.5, about 1 to about 2.2, about 1 to about 2, about 1 to about 1.5, about 1 to about 1.4, or about 1.4, according the Backsheet Graphic Color Test herein, and specifically reciting all 0.5 increments within the specified ranges and all ranges formed therein or thereby.
For all PANTONE colors, including those not listed above, of the one or more graphics on the backsheet, an L* value may be in the range of about 5 to about 95, about 40 to about 95, about 50 to about 95, about 60 to about 95, about 65 to about 95, or the L* value maybe less than 95 or less than 90. An a* value may be in the range of about −90 to about 90, about −50 to about 50, or about −30 to about 40, and a b* value may be in the range of about −90 to about 90, about −50 to about 50, or about −25 to about 40. All L*, a*, b* values are measured according to the Nonwoven-Backsheet Laminate Color Test herein, and specifically reciting all 0.5 increments within the specified ranges and all ranges formed therein or thereby. The color and/or colors may be characterized by CIE 1976 L*, a*, b*, values, according to the Nonwoven-Backsheet Laminate Color Test herein. CIE L*, a*, b* utilizes measures of lightness (L), redness-greenness (a), and yellowness-blueness (b) to characterize colors. The color and/or colors may also be characterized by the PANTONE color system.
One or more graphics on the backsheet that are a PANTONE color of 109 may have an L* value in the range of about 86 to about 96, an a* value in the range of about 0 to about 5, and a b* value in the range of about 18 to about 84, according the Nonwoven-Backsheet Laminate Color Test herein, and specifically reciting all 0.5 increments within the specified ranges and all ranges formed therein or thereby.
One or more graphics on the backsheet that are a PANTONE color of 171 may have an L* value in the range of about 60 to about 86, an a* value in the range of about 15 to about 56, and a b* value in the range of about 13 to about 48, according the Nonwoven-Backsheet Laminate Color Test herein, and specifically reciting all 0.5 increments within the specified ranges and all ranges formed therein or thereby.
One or more graphics on the backsheet that are a PANTONE color of 2965 may have an L* value in the range of about 14 to about 82, an a* value int the range of about −7 to about −2, and a b* value in the range of about −19 to about −5, according the Nonwoven-Backsheet Laminate Color Test herein, and specifically reciting all 0.5 increments within the specified ranges and all ranges formed therein or thereby.
One or more graphics on the backsheet that are a PANTONE color of 3272 may have an L* value in the range of about 58 to about 89, an a* value in the range of about −60 to about −12, and a b* value in the range of about −11 to about −3, according the Nonwoven-Backsheet Laminate Color Test herein, and specifically reciting all 0.5 increments within the specified ranges and all ranges formed therein or thereby.
One or more graphics on the backsheet that are a PANTONE color of 423 may have an L* value in the range of about 58 to about 91, an a* value in the range of about −2 to about −1, and a b* value in the range of about −1 to about 0, according the Nonwoven-Backsheet Laminate Color Test herein, and specifically reciting all 0.5 increments within the specified ranges and all ranges formed therein or thereby.
Referring again to
As mentioned above, the laminates of the present disclosure may be formed by a backsheet and one or more nonwoven webs. Additional laminate examples are now discussed.
Delta E is the difference in color value between a first color value and a second color value. Below a certain delta E, a human eye cannot detect a difference. Humanly detectable delta E values between two colors are greater than 2, greater than 3.4, or greater than 3.5, for example. A range of suitable delta E values for the first and second L*, a*, b* color values of one or more graphics may be in the range of about 2 to about 19, about 2 to about 16, about 3.4 to about 19, about 3.4 to about 16, about 3.5 to about 19, about 3.5 to about 16, about 5 to about 16, about 6 to about 15, about 6, about 7, about 8, about 9, about 10, about 12, about 11, about 13, about 14, or about 15, specifically reciting all 0.1 increments within the specified ranges and all ranges formed therein or thereby.
As illustrated in, for example,
The recognizable, discrete indicia formed by the one or more graphics 400 on the backsheet 28 or by the visually discernible pattern on the outer cover nonwoven material 40 or topsheet may have an area in the range of about 30 mm2 to about 10,000 mm2 about 40 mm2 to about 8,000 mm2, about 40 mm2 to about 3,000 mm2, about 40 mm2 to about 2,000 mm2, about 40 mm2 to about 500 mm2, about 45 mm2 to about 300 mm2, or may be about 52 mm2, about 85 mm2, about 96 mm2, about 157 mm2, about 171 mm2, about 279 mm2, about 1,198 mm2, about 1,950 mm2, or about 4,453 mm2, specifically reciting all 0.5 min increments within the specified ranges and all ranges defined therein or thereby. A backsheet 28, outer cover nonwoven material 40, and/or topsheet, may have at least one recognizable, discrete indicia or a plurality of recognizable, discrete indicia. If more than one recognizable, discrete indicia is provided on the backsheet, the outer cover nonwoven material, or the topsheet, the recognizable, discrete indicia may be the same or different on the various components. Some recognizable, discrete indicia may be the same, while other recognizable, discrete indicia may be different on the various components. As an example, a backsheet, outer cover nonwoven material, and/or topsheet may have about 1 to about 50, about 2 to about 40, about 2 to about 30, about 2 to about 25, or about 2 to about 20, recognizable, discrete indicia, specifically reciting all 1 increments within the specified ranges and all ranges formed therein or thereby. The recognizable, discrete indicia may be oriented the same or differently on the same materials and/or on different materials. An example laminate with recognizable, discrete indicia is the outer cover nonwoven material of
The backsheet, in addition to the various graphics 400 discussed herein, may comprise a stitch-like pattern on the garment-facing surface or the wearer-facing surface thereof. The stitch-like pattern may surround, or partially surround the graphics 400. Typically, the stitch-like pattern does not overlap the graphics 400 or is free from overlap with the graphics 400. In some instances, the stitch-like pattern may overlap the graphics 400 or portions thereof. In some instances, a stitch-like pattern may be used without the graphics 400.
1. An absorbent article comprising:
Chroma values are a measure of the vividness or vibrancy of color in a backsheet graphic. Generally, Chroma is calculated from the reflectance measurements of the CIE 1976 L*a*b* color values. Chroma is measured using a spectrophotometer with a computer interface (a suitable instrument is the HunterLab LabScan XE running Universal Software, as available from Hunter Associates Laboratory Inc., Reston, Va.). All testing is performed in a conditioned room maintained at about 23±2° C. and about 50±2% relative humidity.
To obtain a sample, carefully remove the backsheet film layer of material from an absorbent article. A cryogenic spray (such as Cyto-Freeze, Control Company, Houston Tex.) can be used to remove the sample from the underlying and overlaying layers, if necessary. Identify a region of the sample containing a homogeneous colored graphic as the testing site. If the sample at the testing site contains any holes, tears, or other physical deformations another site is to be selected. Ensure that all adhesive and nonwoven fibers have been completely removed from the testing site. A layer of raw backsheet film material with a graphic, obtained prior to incorporation into an absorbent article, may also be tested. Precondition the samples at about 23° C.±2 C.° and about 50%±2% relative humidity for 2 hours prior to testing.
Select the disk with the largest measurement port size that can fit within the selected homogeneous colored graphic testing site. Standardize the instrument using the selected port size (indicate the appropriate area view to the software) utilizing the manufacturer supplied black tile, then white tile. Calibrate the instrument according to manufacturer's specifications using their supplied standard tiles. Configure the software to measure color using the CIE 1976 L*a*b* color scale, D65 illuminant and 10° standard observer.
Place the sample over the measurement port, with the garment-facing surface or the wearer-facing surface oriented toward the instrument, depending on what surface the graphic is on. Gently pull the sample taut, without stretching, to ensure that it does not pillow into the port, and then back it with the standard white tile. Make sure that the area of the sample to be measured faces the port and completely covers the port. Take a reading and record the individual L*, a*, and b* values, then remove the white tile and sample. Calculate the Chroma value for the sample according to the following equation:
Chroma=√{square root over (a*2+b*2)}
The Chroma value for the sample is recorded to the nearest 0.1 units.
The purpose of this test is to measure the CIE 1976 L*a*b* color values of a backsheet graphic visible through a region of an outer cover nonwoven material and/or topsheet, and calculate the delta E, or the magnitude of color difference, between two regions. A flatbed scanner capable of scanning a minimum of 24 bit color at 2400 dpi with manual control of color management (a suitable scanner is an Epson Perfection V750 Pro from Epson America Inc., Long Beach Calif., or equivalent) is used to acquire images. The scanner is interfaced with a computer running color calibration software capable of calibrating the scanner against a color reflection IT8 target utilizing a corresponding reference file compliant with ANSI method IT8.7/2-1993 (suitable color calibration software is Monaco EZColor or i1Studio available from X-Rite Grand Rapids, Mich., or equivalent). The color calibration software constructs an International Color Consortium (ICC) color profile for the scanner, which is used to color correct an output image using an image analysis program that supports application of ICC profiles (a suitable program is Photoshop available from Adobe Systems Inc., San Jose, Calif., or equivalent). The color corrected image is then converted to into the CIE L*a*b* color space for subsequent color analysis (a suitable image color analysis software is MATLAB available from The Mathworks, Inc., Natick, Mass.).
To obtain a sample, carefully remove the outer cover nonwoven material and backsheet film laminate or topsheet and backsheet film laminate from an absorbent article. A cryogenic spray (such as Cyto-Freeze, Control Company, Houston Tex.) can be used to remove the sample from the underlying layers if necessary. Identify a portion of the sample where the visually discernible pattern of three-dimensional features in the outer cover nonwoven material or topsheet overlaps a portion of a homogeneous colored graphic on the backsheet film as the testing site. If the sample at the testing site contains any holes, tears, or other physical deformations, other than three-dimensional features, another site is to be selected. A laminate of an outer cover nonwoven material and a backsheet film or a laminate of a topsheet and a backsheet film with a graphic obtained prior to incorporation into an absorbent article may also be tested. Precondition the samples at about 23° C.±2 C.° and about 50%±2% relative humidity for 2 hours prior to testing.
The scanner is turned on 30 minutes prior to calibration and image acquisition. Deselect any automatic color correction or color management options that may be included in the scanner software. If the automatic color management cannot be disabled, the scanner is not appropriate for this application. The recommended procedures of the color calibration software are followed to create and export an ICC color profile for the scanner. The color calibration software compares an acquired IT8 target image to a corresponding reference file to create and export the ICC color profile for a scanner, which will be applied within the image analysis program to correct the color of subsequent output images.
The scanner lid is opened and the sample carefully laid flat on the center of the scanner glass with the wearer-facing surface (if a topsheet/backsheet film laminate) or with the garment-facing surface (if an outer cover nonwoven material/backsheet film laminate) of the testing site oriented toward the glass. A scan containing the entire testing site is acquired and imported into the image analysis software at 24 bit color with a resolution of 2400 dpi (approximately 94.5 pixels per mm) in reflectance mode. The ICC color profile is assigned to the image producing a color corrected sRGB image. This calibrated image is saved in an uncompressed format to retain the calibrated R,G,B color values, such as a TIFF file, prior to analysis.
The sRGB color calibrated image is opened in the color analysis software, and converted into the CIE L*a*b* color space. This is accomplished by the following procedure. First, the sRGB data is scaled into a range of [0, 1] by dividing each of the values by 255. Then the companded sRGB channels (denoted with upper case (R,G,B), or generically V) are linearized (denoted with lower case (r,g,b), or generically v) as the following operation is performed on all three channels (R, G, and B):
The linear r, g, and b values are then multiplied by a matrix to obtain the XYZ Tristimulus values according to the following formula:
The XYZ Tristimulus values are rescaled by multiplying the values by 100, and then converted into CIE 1976 L*a*b* values as defined in CIE 15:2004 section 8.2.1.1 using D65 reference white.
The CIE L*a*b* image is analyzed by identifying and manually drawing a region of interest (ROI) around the visibly discernable perimeter of a first region. The average L*, a*, and b* color values within the ROI are measured and recorded as L*1, a*1, and b*1. A second region, having different intensive properties from the first region, is identified and a region of interest (ROI) is manually drawn around its visibly discernable perimeter. The average L*, a*, and b* color values are then measured for the second region, and recorded as L*2, a*2, and b*2. The Delta E value is then calculated according to the following equation:
Delta E=√{square root over ((L*2−L*1)2+(a*2−a*1)2+(b*2−b*1)2)}
The individual L*, a*, and b* color values for the two regions, and Delta E value are reported to the nearest 0.1 units.
The Air Permeability Test is used to determine the level of air flow in cubic feet per minute (cfm) through a forming belt. The Air Permeability Test is performed on a Texas Instruments model FX3360 Portair Air Permeability Tester, available from Textest AG, Sonnenbergstrasse 72, CH 8603 Schwerzenbach, Switzerland. The unit utilizes a 20.7 mm orifice plate for air permeability ranges between 300-1000 cfm. If air permeability is lower than 300 cfm the orifice plate needs to be reduced; if higher than 1000 cfm the orifice plate needs to be increased. Air permeability can be measured in localized zones of a forming belt to determine differences in air permeability across a forming belt.
Basis weight of the nonwoven webs described herein may be determined by several available techniques, but a simple representative technique involves taking an absorbent article or other consumer product, removing any elastic which may be present and stretching the absorbent article or other consumer product to its full length. A punch die having an area of 45.6 cm2 is then used to cut a piece of the nonwoven web (e.g., top sheet, outer cover nonwoven material) from the approximate center of the absorbent article or other consumer product in a location which avoids to the greatest extent possible any adhesive which may be used to fasten the nonwoven web to any other layers which may be present and removing the nonwoven web from other layers (using cryogenic spray, such as Cyto-Freeze, Control Company, Houston, Tex., if needed). The sample is then weighed and dividing by the area of the punch die yields the basis weight of the nonwoven web. Results are reported as a mean of 5 samples to the nearest 0.1 gram per square meter (gsm).
The Emtec Test is performed on portions of nonwoven webs of interest. In this test, TS7, TS750, and D values are measured using an Emtec Tissue Softness Analyzer (“Emtec TSA”) (Emtec Electronic GmbH, Leipzig, Germany) interfaced with a computer running Emtec TSA software (version 3.19 or equivalent). The Emtec TSA includes a rotor with vertical blades which rotate on the test sample at a defined and calibrated rotational speed (set by manufacturer) and contact force of 100 mN. Contact between the vertical blades and the test sample creates vibrations both in the blades and in the test piece, and the resulting sound is recorded by a microphone within the instrument. The recorded sound file is then analyzed by the Emtec TSA software to determine TS7 and TS750 values. The D value is a measure of sample stiffness and is based on the vertical distance required for the contact force of the blades on test sample to be increased from 100 mN to 600 mN. The sample preparation, instrument operation, and testing procedures are performed according the instrument manufacturer's specifications.
A test sample is prepared by cutting a square or circular portion of interest from a nonwoven web of an absorbent article. It is preferable that freeze spray is not used to remove the nonwoven web to be analyzed from the absorbent article, though it is acceptable to use freeze spray in a distal region to aid in initiating the separation of layers. Test samples are cut to a length and width (diameter in the case of a circular sample) of no less than about 90 mm and no greater than about 120 mm to ensure the sample can be clamped into the TSA instrument properly. (If an absorbent article does not contain a sufficiently large area of the substrate of interest to extract a sample of the size specified above, it is acceptable to sample equivalent material from roll stock.) Test samples are selected to avoid unusually large creases or folds within the testing region. Six substantially similar replicate samples are prepared for testing.
All samples are equilibrated at TAPPI standard temperature and relative humidity conditions (23° C.±2 C.° and 50%±2%) for at least 2 hours prior to conducting the TSA testing, which is also conducted under TAPPI conditions.
The instrument is calibrated according to the Emtec's instructions using the 1-point calibration method with the appropriate reference standards (so-called “ref.2 samples,” or equivalent, available from Emtec).
A test sample is mounted in the instrument with the surface of interest facing upward, and the test is performed according to the manufacturer's instructions. The software displays values for TS7, TS750, and D when the automated instrument testing routine is complete. TS7 and TS750 are each recorded to the nearest 0.01 dB V2 rms, and D is recorded to the nearest 0.01 mm/N. The test sample is then removed from the instrument and discarded. This testing procedure is performed individually on the corresponding surfaces of interest of each of the six of the replicate samples (wearer-facing surface for topsheet samples and garment-facing surface for outer cover nonwoven material samples).
The value of TS7, TS750, and D are each averaged (arithmetic mean) across the six sample replicates. The average values of TS7 and TS750 are reported to the nearest 0.01 dB V2 rms. The average value of D is reported to the nearest 0.01 mm/N.
The micro-CT intensive property Measurement method measures the basis weight, thickness and volumetric density values within visually discernable regions of a substrate sample. It is based on analysis of a 3D x-ray sample image obtained on a micro-CT instrument (a suitable instrument is the Scanco μCT 50 available from Scanco Medical AG Switzerland, or equivalent). The micro-CT instrument is a cone beam microtomograph with a shielded cabinet. A maintenance free x-ray tube is used as the source with an adjustable diameter focal spot. The x-ray beam passes through the sample, where some of the x-rays are attenuated by the sample. The extent of attenuation correlates to the mass of material the x-rays have to pass through. The transmitted x-rays continue on to the digital detector array and generate a 2D projection image of the sample. A 3D image of the sample is generated by collecting several individual projection images of the sample as it is rotated, which are then reconstructed into a single 3D image. The instrument is interfaced with a computer running software to control the image acquisition and save the raw data. The 3D image is then analyzed using image analysis software (a suitable image analysis software is MATLAB available from The Mathworks, Inc., Natick, Mass., or equivalent) to measure the basis weight, thickness and volumetric density intensive properties of regions within the sample.
Sample Preparation:
To obtain a sample for measurement, lay a single layer of the dry substrate material out flat and die cut a circular piece with a diameter of 30 mm.
If the substrate material is a layer of an absorbent article, for example a topsheet, backsheet outer cover nonwoven material, acquisition layer, distribution layer, or other component layer; tape the absorbent article to a rigid flat surface in a planar configuration. Carefully separate the individual substrate layer from the absorbent article. A scalpel and/or cryogenic spray (such as Cyto-Freeze, Control Company, Houston Tex.) can be used to remove a substrate layer from additional underlying layers, if necessary, to avoid any longitudinal and lateral extension of the material. Once the substrate layer has been removed from the article proceed with die cutting the sample as described above.
If the substrate material is in the form of a wet wipe, open a new package of wet wipes and remove the entire stack from the package. Remove a single wipe from the middle of the stack, lay it out flat and allow it to dry completely prior to die cutting the sample for analysis.
A sample may be cut from any location containing the visually discernible zone to be analyzed. Within a zone, regions to be analyzed are ones associated with a three-dimensional feature defining a microzone. The microzone comprises a least two visually discernible regions. A zone, three-dimensional feature, or microzone may be visually discernable due to changes in texture, elevation, or thickness. Regions within different samples taken from the same substrate material may be analyzed and compared to each other. Care should be taken to avoid folds, wrinkles or tears when selecting a location for sampling.
Image Acquisition:
Set up and calibrate the micro-CT instrument according to the manufacturer's specifications. Place the sample into the appropriate holder, between two rings of low density material, which have an inner diameter of 25 mm. This will allow the central portion of the sample to lay horizontal and be scanned without having any other materials directly adjacent to its upper and lower surfaces. Measurements should be taken in this region. The 3D image field of view is approximately 35 mm on each side in the xy-plane with a resolution of approximately 5000 by 5000 pixels, and with a sufficient number of 7 micron thick slices collected to fully include the z-direction of the sample. The reconstructed 3D image resolution contains isotropic voxels of 7 microns. Images are acquired with the source at 45 kVp and 133 μA with no additional low energy filter. These current and voltage settings may be optimized to produce the maximum contrast in the projection data with sufficient x-ray penetration through the sample, but once optimized held constant for all substantially similar samples. A total of 1500 projections images are obtained with an integration time of 1000 ms and 3 averages. The projection images are reconstructed into the 3D image, and saved in 16-bit RAW format to preserve the full detector output signal for analysis.
Image Processing:
Load the 3D image into the image analysis software. Threshold the 3D image at a value which separates, and removes, the background signal due to air, but maintains the signal from the sample fibers within the substrate.
Three 2D intensive property images are generated from the thresheld 3D image. The first is the Basis Weight Image. To generate this image, the value for each voxel in an xy-plane slice is summed with all of its corresponding voxel values in the other z-direction slices containing signal from the sample. This creates a 2D image where each pixel now has a value equal to the cumulative signal through the entire sample.
In order to convert the raw data values in the Basis Weight Image into real values a basis weight calibration curve is generated. Obtain a substrate that is of substantially similar composition as the sample being analyzed and has a uniform basis weight. Follow the procedures described above to obtain at least ten replicate samples of the calibration curve substrate. Accurately measure the basis weight, by taking the mass to the nearest 0.0001 g and dividing by the sample area and converting to grams per square meter (gsm), of each of the single layer calibration samples and calculate the average to the nearest 0.01 gsm. Following the procedures described above, acquire a micro-CT image of a single layer of the calibration sample substrate. Following the procedure described above process the micro-CT image, and generate a Basis Weight Image containing raw data values. The real basis weight value for this sample is the average basis weight value measured on the calibration samples. Next, stack two layers of the calibration substrate samples on top of each other, and acquire a micro-CT image of the two layers of calibration substrate. Generate a basis weight raw data image of both layers together, whose real basis weight value is equal to twice the average basis weight value measured on the calibration samples. Repeat this procedure of stacking single layers of the calibration substrate, acquiring a micro-CT image of all of the layers, generating a raw data basis weight image of all of the layers, the real basis weight value of which is equal to the number of layers times the average basis weight value measured on the calibration samples. A total of at least four different basis weight calibration images are obtained. The basis weight values of the calibration samples must include values above and below the basis weight values of the original sample being analyzed to ensure an accurate calibration. The calibration curve is generated by performing a linear regression on the raw data versus the real basis weight values for the four calibration samples. This linear regression must have an R2 value of at least 0.95, if not repeat the entire calibration procedure. This calibration curve is now used to convert the raw data values into real basis weights.
The second intensive property 2D image is the Thickness Image. To generate this image the upper and lower surfaces of the sample are identified, and the distance between these surfaces is calculated giving the sample thickness. The upper surface of the sample is identified by starting at the uppermost z-direction slice and evaluating each slice going through the sample to locate the z-direction voxel for all pixel positions in the xy-plane where sample signal was first detected. The same procedure is followed for identifying the lower surface of the sample, except the z-direction voxels located are all the positions in the xy-plane where sample signal was last detected. Once the upper and lower surfaces have been identified they are smoothed with a 15×15 median filter to remove signal from stray fibers. The 2D Thickness Image is then generated by counting the number of voxels that exist between the upper and lower surfaces for each of the pixel positions in the xy-plane. This raw thickness value is then converted to actual distance, in microns, by multiplying the voxel count by the 7 μm slice thickness resolution.
The third intensive property 2D image is the Volumetric Density Image. To generate this image divide each xy-plane pixel value in the Basis Weight Image, in units of gsm, by the corresponding pixel in the Thickness Image, in units of microns. The units of the Volumetric Density Image are grams per cubic centimeter (glee).
Micro-CT Basis Weight, Thickness and Volumetric Density Intensive Properties:
Begin by identifying the region to be analyzed. A region to be analyzed is one associated with a three-dimensional feature defining a microzone. The microzone comprises a least two visually discernible regions. A zone, three-dimensional feature, or microzone may be visually discernable due to changes in texture, elevation, or thickness. Next, identify the boundary, of the region to be analyzed. The boundary of a region is identified by visual discernment of differences in intensive properties when compared to other regions within the sample. For example, a region boundary can be identified based by visually discerning a thickness difference when compared to another region in the sample. Any of the intensive properties can be used to discern region boundaries on either the physical sample itself of any of the micro-CT intensive property images. Once the boundary of the region has been identified, draw an oval or circular “region of interest” (ROI) within the interior of the region. The ROI should have an area of at least 0.1 mm2, and be selected to measure an area with intensive property values representative of the identified region. From each of the three intensive property images calculate the average basis weight, thickness and volumetric density within the ROI. Record these values as the region's basis weight to the nearest 0.01 gsm, thickness to the nearest 0.1 micron and volumetric density to the nearest 0.0001 glee.
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 forms of the present disclosure 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 present disclosure. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this present disclosure.
This application claims the benefit, under 35 U.S.C. § 119(e), of U.S. Provisional Patent Application No. 63/031,086, filed on May 28, 2020, the entire disclosure of which is incorporated herein by reference.
Number | Date | Country | |
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63031086 | May 2020 | US |