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    • 专利摘要:
    RESILIENT ABSORBENT COFORM NON-WOVEN PLOT. The present invention provides a resilient coform nonwoven web, which contains a matrix of meltblown fibers and an absorbent material. Meltblown fibers can comprise from about 45% by weight to about 99% by weight of the weft and the absorbent material can make up from about 99% by weight of the weft and the absorbent material can make up from about 1% by weight at about 55% by weight of the frame. Meltblown fibers can be formed from a thermoplastic composition, which contains at least one propylene / alpha-olefin copolymer having a propylene content of about 60 mol% to about 99.5 mol% and a content in Alpha-olefin from about 0.5 mol% to about 40 mol%. The copolymer can have a density of about 0.86 to about 0.90 grams per cubic centimeter and the thermoplastic composition can have a melt flow rate of about 200 to about 6000 grams for 10 minutes, determined at 230 ° C, according to the ASTM D1238-E test method. The conform web can be provided with a three-dimensional texture, for example, by use (...).
    公开号:BR112012014276B1
    申请号:R112012014276-3
    申请日:2010-11-17
    公开日:2020-12-29
    发明作者:David M. Jackson
    申请人:Kimberly - Clark Worldwide, Inc；
    IPC主号:
    专利说明:

    HISTORY OF THE INVENTION
    [001] Non-woven coform wefts, which are composites of a matrix of blow-melted fibers and an absorbent material (eg pulp fibers), have been used as an absorbent layer in a wide variety of applications, including absorbent articles , dry absorbent wipes, baby wipes, and mops. The most conventional coform wefts employ blow-molded fibers formed from polypropylene homopolymers. A problem sometimes experienced with such coform materials, however, is that coform materials may not be sufficiently resilient when subjected to bending forces. For example, when a coform cloth is crumpled, perhaps by twisting to remove fluid from the cloth, the coform material may not return to its original, flat, crumpled state. As another example, a coform material, used as an absorbent core in an absorbent personal care product, may have a tendency to pile up.
    [002] As such, there is currently a demand for a non-woven co-form weave perfected for use in a variety of applications, which exhibit improved resistance to bending forces and which shows a tendency to return to a flat state after being folded. SUMMARY OF THE INVENTION
    [003] In accordance with an embodiment of the present invention, a resilient coform nonwoven web is described, which includes a matrix of blown melt fibers and an absorbent material. The blown melt fibers comprise from about 45% by weight to about 99% by weight of the weft and the absorbent material constitutes from about 1% by weight to about 55% by weight of the weft. Blown melt fibers are formed from a thermoplastic composition, which contains at least one propylene / α-olefin copolymer having a propylene content of about 60 mol% to about 99.5 mol% and a content in α-olefin from about 0.5 mol% to about 40 mol%. The copolymer additionally has a density of about 0.86 to about 0.90 grams per cubic centimeter and the thermoplastic composition has a melt flow rate of about 200 to about 6000 grams for 10 minutes, determined at 230 ° C, according to the ASTM D1238-E test method. In another embodiment, α-olefin includes ethylene. In an additional embodiment, propylene constitutes from about 85 mol% to about 98 mol% of the copolymer and α-olefin constitutes from about 2 mol% to about 15 mol% of the copolymer. In a still further embodiment, the copolymer has a density of about 0.861 to about 0.89 grams per cubic centimeter, and preferably about 0.862 to about 0.88 grams per cubic centimeter. In another embodiment, the propylene copolymer is catalyzed in a single site. In an additional embodiment, the propylene / α-olefin copolymer constitutes from about 15% by weight to about 99.9% by weight of the thermoplastic composition.
    [004] In one embodiment, the melt flow rate is about 170 to about 1,500 grams for 10 minutes.
    [005] In one embodiment, the thermoplastic composition includes from about 0.001% by weight to about 15% by weight of a surfactant.
    [006] In one embodiment, the absorbent material includes pulp fibers. In an additional embodiment, the absorbent material comprises particles of superabsorbent polymer or fibers of superabsorbent polymer.
    [007] In one embodiment, the blown melt fibers comprise 50% by weight to about 90% by weight of the weft and the absorbent material constitutes from about 10% by weight to about 50% by weight of the weft.
    [008] In one embodiment, the plot defines an external surface presenting a three-dimensional texture, which includes a plurality of peaks and valleys.
    [009] In one embodiment, an absorbent personal care article includes the resilient coform nonwoven fabric described above. In an additional embodiment, an absorbent personal care article includes a body-facing lining, an absorbent core including the resilient coform nonwoven fabric described above and a baffle facing the garment.
    [0010] In accordance with another embodiment of the present invention, a method of forming a resilient coform nonwoven web is described, which includes fusing together a stream of an absorbent material with a stream of blow-melted fibers to form a composite chain. The blown melt fibers comprise from 45% by weight to about 99% by weight of the weft and the absorbent material constitutes from about 1% by weight to about 55% by weight of the weft. Blow-melted fibers are formed from a thermoplastic composition containing at least one propylene / α-olefin copolymer having a propylene content of about 60 mol to about 99.5 mol% and a α-olefin from about 0.5 mol% to about 40 mol%, with the copolymer having an additional density of about 0.86 to about 0.90 grams per cubic centimeter and the composition has a melting flow rate of about 120 to about 6,000 grams for 10 minutes, determined at 230 ° C, according to the ASTM D1238-E test method. After that, the composite stream is collected on a forming surface, to form a non-woven web of resilient coform.
    [0011] In one embodiment, the melt flow rate of the thermoplastic composition is about 170 to about 1,500 grams for 10 minutes.
    [0012] In one embodiment, the thermoplastic composition comprises from about 0.001% by weight to about 15% by weight of a surfactant.
    [0013] In one embodiment, the stream of absorbent material is melted together with the first and second streams of fibers melted by blow. In an additional embodiment, the first and second strands of blow-melted fibers are supplied from the respective first and second heads, each of which is oriented at an angle of about 45 ° to 55 ° with respect to a tangent plane to the mold heads.
    [0014] In one embodiment, the weave is collected on a textured surface, to define an external weave surface presenting a three-dimensional texture, which includes a plurality of peaks and valleys.
    [0015] Other features and aspects of the present invention are described in more detail below. BRIEF DESCRIPTION OF THE DRAWINGS
    [0016] A complete and enabling description of the present invention, including its best mode, addressed to a person skilled in the art, is shown more particularly in the rest of the specification, which makes reference to the attached figures, in which:
    [0017] Figure 1 is a schematic illustration of an embodiment of a method for forming the coform web of the present invention;
    [0018] Figure 2 is an illustration of certain characteristics of the device shown in Figure 1; and
    [0019] Figure 3 is a cross-sectional view of an embodiment of a non-woven textured coform web formed in accordance with the present invention.
    [0020] Figure 4 is a photo of a modality of a non-woven weave of textured coform.
    [0021] Figure 5 is a photo of the textured non-woven coform weaves in Figure 4 after being crumpled and allowed to relax.
    [0022] Figure 6 is a photo of another modality of a non-woven weave of textured coform.
    [0023] Figure 7 is a photo of the textured non-woven coform weaves of Figure 6 after being crumpled and allowed to relax.
    [0024] Figure 8 is a schematic side elevation of a feminine hygiene item.
    [0025] The repeated use of reference characters in the present specification and drawings is intended to represent the same elements or characteristics or similar elements or characteristics of the invention. DETAILED DESCRIPTION OF REPRESENTATIVE MODALITIES
    [0026] Reference will now be made in detail to various embodiments of the invention, one or more examples of which are shown below. Each example is provided by way of explanation, not limitation, of the invention. Indeed, it will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the scope and spirit of the invention. For example, features illustrated or described as part of one embodiment, can be used in another embodiment to provide yet another embodiment. Therefore, the present invention is intended to cover such modifications and variations.
    [0027] As used here, the term "non-woven weave" refers to a weave having a structure of individual fibers or filaments, which are intertwined, but not in an identifiable way as in a knitted fabric. Examples of textile products or nonwoven fabrics include, but are not limited to, blow cast fabrics, spinning fabrics, connected carded fabrics, air deposited fabrics, coform fabrics, hydraulically matted fabrics, and so on.
    [0028] As used here, the term "blow-fused weft", in general, refers to a non-woven weft, which is formed by a process, in which a fused thermoplastic material is extruded through a plurality of capillaries of fine molds, usually circular, like fibers melted into high-speed, converging gas streams (for example, converging), which attenuate the fibers of melted thermoplastic material to reduce their diameter, which can be up to the diameter of microfiber. Thereafter, the blow-fused fibers are carried by the high-speed gas stream and are deposited on a collecting surface to form a randomly dispersed blow-fused fiber web. Such a process is described, for example, in U.S. Patent No. 3,849,241, to Butin et al., Which is incorporated herein in its entirety by reference to it for all purposes. Generally speaking, blowing fibers can be microfibers, which are substantially continuous or discontinuous, generally smaller than 10 micrometers in diameter, and which, in general, are sticky when deposited on a collecting surface.
    [0029] As used here, the term "spinning weft", in general, refers to a weft containing substantially continuous fibers of small diameter. The fibers are formed by extrusion of a fused thermoplastic material, from a plurality of fine capillaries, usually circular, from a spinner with the diameter of the extruded fibers, then, being quickly reduced according to, for example, extractive and / or other well-known wiring mechanisms. The production of spinning wefts is described and illustrated, for example, in U.S. Patent Nos. 4,340,563 by Appel et al .; 3,692,618 to Dorschner et al .; 3,802,817 to Matsuki et al .; 3,338,992 to Kinney; 3,341,394 to Kinney; 3,502,763 to Hartman; 3,502,538 to Levy; 3,542,615 to Dobo et al. and 5,382,400 by Pike et al., which are incorporated herein, in their entirety, by reference to them, for all purposes. Spinning fibers are generally non-sticky when they are deposited on a collecting surface. Spinning fibers can sometimes have diameters smaller than about 40 micrometers, and are often between about 5 and about 20 micrometers.
    [0030] Generally speaking, the present invention is directed to a non-woven coform weave, which contains a matrix of blown fused fibers and an absorbent material. The blown melt fibers comprise from 45% by weight to about 99% by weight of the web and the absorbent material constitutes from about 1% by weight to about 55% by weight of the web. Blown melt fibers are formed from a thermoplastic composition, which contain at least one propylene / α-olefin copolymer of a certain monomer content, density, melt flow rate, etc. The selection of a specific type of propylene / α-olefin copolymer provides the resulting composition with improved thermal properties for forming a coform web. For example, the thermoplastic composition crystallizes at a relatively slow rate, thereby allowing the fibers to remain smoothly sticky during formation. Stickiness can provide a variety of benefits, such as enhancing the ability of blow-melted fibers to adhere to the absorbent material during weft formation. Blown melt fibers can comprise from about 45% by weight to about 99% by weight, in particular embodiments, from about 50% by weight to about 90% by weight, and, in more particular embodiments, from about from 50% by weight to about 80% by weight of the coform web. Likewise, the absorbent material may comprise from about 1% by weight to about 55% by weight, in particular embodiments, from 10% by weight to about 50% by weight, and, in more particular embodiments, from about 20 % by weight to about 50% by weight of the coform web.
    [0031] In addition to enhancing the bonding capacity of the melt blown fibers, the thermoplastic composition of the present invention can also confer other benefits to the resulting coform structure. In certain embodiments, for example, the coform web can be provided with texture using a three-dimensional forming surface. In such embodiments, the relatively slow crystallization rate of the melt-blown fibers can increase their ability to conform. to the contours of the three-dimensional formation surface. Once the fibers crystallize, however, the melt-blown fibers can achieve a higher degree of resilience than that of conventional polypropylene, thereby allowing them to both retain and reacquire the three-dimensional shape and the highly textured surface on the weft of coform.
    [0032] Another benefit of the prolonged stickiness of the fiber during formation can be an increased layer-clamping resistance between layers of a multilayer coform nonwoven web, resulting in additional shear energy being required to delaminate the layers. Such increased layer-clamping resistance can reduce or eliminate the need for embossing, which could negatively impact sheet characteristics such as thickness and density. Increased layering strength may be particularly desirable when distributing cloths prepared from a multi-layer nonwoven fabric. The texture imparted by the use of a three-dimensional forming surface, as described here, can additionally increase the bonding strength of layers by increasing the contact surface area of the layers.
    [0033] Various embodiments of the present invention will now be described in more detail. I. Thermoplastic Composition
    [0034] The thermoplastic composition of the present invention contains at least one propylene copolymer and an α-olefin, such as a C2-C20-α-olefin, a C2-C12-α-olefin or a C2-C8-α-olefin . Suitable α-Olefins can be linear or branched (for example, one or more C1-C2-alkyl branches or an aryl group). Specific examples include ethylene, butene; 3-methyl-1-butene; 3,3-dimethyl-1-butene; pentene; pentene with one or more methyl, ethyl or propyl substituents; hexene with one or more methyl, ethyl or propyl substituents; heptene with one or more methyl, ethyl or propyl substituents; octene with one or more methyl, ethyl or propyl substituents; nonene plus substituents with either methyl, ethyl or propyl; decene replaced with ethyl, methyl or dimethyl; dodecene; styrene; and so on. Particularly desired α-olefin comonomers are ethylene, butene (for example, 1-butene), heptene and octene (for example, 1-octene or 2-octene). The propylene content of such copolymers can be from about 60 mol% to about 99.5 mol%, in additional embodiments, from about 80 mol% to about 99 mol%, and in further embodiments from about 85 mol% to about 98 mol%. The α-olefin content can also vary from about 0.5 mol% to about 40 mol%, in additional modalities, from about 1 mol% to about 20 mol%, and, in still modalities additional, from about 2 mol% to about 15 mol%. The distribution of the α-olefin comonomer is typically random and uniform among the fractions of different molecular weights forming the propylene copolymer.
    [0035] The density of the propylene / α-olefin copolymer can be a function of both the length and the amount of the α-olefin. In other words, the greater the length of α-olefin and the greater the amount of α-olefin present, the lower the density of the copolymer. Generally speaking, copolymers with a higher density are better able to form a three-dimensional structure, while those with a lower density have better elastomeric and resilience properties. Therefore, to achieve an optimal balance between texture and resilience, the propylene / α-olefin copolymer is normally selected to have a density of about 0.860 grams per cubic centimeter (g / cm3) at about 0.900 g / cm3, in additional modalities, from about 0.861 to about 0.890 g / cm3, and, still in additional modalities, from about 0.862 g / cm3 to about 0.880 g / cm3. In addition, the density of the thermoplastic composition is normally selected to have a density of about 0.860 grams per cubic centimeter (g / cm3) to about 0.940 g / cm3, in additional embodiments, from about 0.861 to about 0.920 g / cm3, and, in still additional modalities, from about 0.862 g / cm3 to about 0.900 g / cm3.
    [0036] Any one of a variety of known techniques can, in general, be used to form the propylene / α-olefin copolymer used in blow-melted fibers. For example, olefin polymers can be formed using a free radical catalyst or a coordinating catalyst (for example, Ziegler-Natta). Preferably, the copolymer is formed from a single site coordination catalyst, such as a metallocene catalyst. Such a catalyst system produces copolymers of propylene, in which the comonomer is randomly distributed within a molecular chain and uniformly distributed across different molecular weight fractions. Propylene copolymers catalyzed by metallocenes are described, for example, in U.S. Patent Nos. 7,105,609, de Datta, et al.,; 6,500,563, by Datta, et al .; 5,339,056, by Yang, et al .; and 5,596,052, by Resconi, et al., which are incorporated herein in their entirety, by reference to them, for all purposes.
    [0037] Examples of metallocene catalysts include bis (n-butyl-cyclopentadienyl) titanium dichloride, bis (n-butylcyclopentadienyl) zirconium dichloride, scandium bis (cyclopentadienyl) chloride, zirconium bis (indenyl) dichloride, bis dichloride (methyl-cyclopentadienyl) titanium, bis (methyl-cyclopentadienyl) dichloride zirconium, cobaltocene, cyclopentadienyl-titanium trichloride, ferrocene, hafnocene dichloride, isopropyl dichloride (cyclopentadienyl, n-fluorenyl, -1-fluorenyl) zirconium niobiocene dichloride, rutenocene, titanocene dichloride, zirconocene chloride, zirconocene dichloride, and so on. Polymers prepared using metallocene catalysts typically have a narrow range of molecular weights. For example, metallocene-catalyzed polymers may show polydispersity indices (Mw / Mn) below 4, controlled short chain branch distribution and controlled tacticity.
    [0038] In particular modalities, the propylene / α-olefin copolymer constitutes about 50% by weight or more, in additional modalities, about 60% by weight or more, and, even in additional modalities, about 75% in weight or more of the thermoplastic composition used to form the melt blown fibers. In other embodiments, the propylene / α-olefin copolymer constitutes at least about 1% by weight and less than about 49% by weight, in particular embodiments, at least about 1% by weight and less than about of 45% by weight, in additional embodiments, of at least about 5% by weight and less than about 45% by weight, and, in still further embodiments, of at least about 5% by weight and less than about 35% by weight of the thermoplastic composition used to form the melt blown fibers. Of course, other thermoplastic polymers can also be used to form the melt blown fibers, as long as they do not adversely affect the desired properties of the composite.
    [0039] For example, blow-fused fibers may contain other polyolefins (eg, polypropylene, polyethylene, etc.), polyesters, polyurethanes, polyamides, block copolymers, and so on. In one embodiment, the melt-blown fibers may contain an additional propylene polymer, such as homopolypropylene or a propylene copolymer. The additional propylene polymer can, for example, be formed from a substantially isotactic propylene homopolymer or a copolymer containing equal to or less than about 10% by weight of another monomer, i.e. at least about 90 % by weight of propylene. Such a polypropylene can be present in the form of a graft copolymer, random or in blocks and can be predominantly crystalline in that it has a clear melting point above about 110 ° C, in some embodiments, above about 115 ° C, and, in still additional modalities, above about 130 ° C. Examples of such additional polypropylenes are described in U.S. Patent No. 6,992,159, to Datta et al., Which is incorporated herein in its entirety, by reference to it, for all purposes.
    [0040] In particular embodiments, the additional polymer (s) may comprise from about 0.1% by weight to about 90% by weight, in additional embodiments, from about 0, 5% by weight to about 50% by weight, and, in still further embodiments, from about 1% by weight to about 30% by weight of the thermoplastic composition. Likewise, the propylene / α-olefin copolymer described above can comprise from about 15% by weight to about 99.9% by weight, in additional embodiments, from about 50% by weight to about 99.5% by weight. weight, and, in yet additional embodiments, from about 70% by weight to about 99% by weight of the thermoplastic composition.
    [0041] The thermoplastic composition, used to form the melt-blown fibers, can also contain other additives, as is known in the art, such as surfactants, melting mass stabilizers, processing stabilizers, thermal stabilizers, light-based stabilizers , antioxidants, stabilizers in the face of thermal aging, bleaching agents, etc. Phosphite stabilizers (e.g., IRGAFOS, available from Ciba Specialty Chemicals, Tarrytown, New York, and DOVERPHOS, available from Dover Chemical Corp., Dover, Ohio) are exemplary melt mass stabilizers. In addition, hindered amine stabilizers (for example, CHIMASSORB, available from Ciba Specialty Chemicals) are exemplary thermal and light-based stabilizers. In addition, hindered fencSis are commonly used as an antioxidant. Some suitable hindered phenols include those available from Ciba Specialty Chemicals (Ciba), under the trade name "Irganox®", such as Irganox® 1076, 35 1010 or E 201. When used, such additives (eg, antioxidant, stabilizer , surfactants, etc.) may each be present in an amount of about 0.001% by weight to about 15% by weight, in additional embodiments, from about 0.005% by weight to about 10% by weight, and , in yet additional embodiments, from about 0.01% to about 5% by weight of the thermoplastic composition used to form the blown melt fibers. One or more surfactants can be added to the polymer composition to make the polymer fibers more humectable and to improve the fluid absorption properties of the coform material. Suitable surfactants include cationic, anionic, amphoteric and non-ionic surfactants. A particularly suitable internal surfactant, which is available from Ciba, is IRGASURF HL 560. When used, each surfactant can be present in an amount of about 0.5% by weight to about 10% by weight, in additional modalities, from about 1.0% by weight to about 7.5% by weight, and, in still further embodiments, from about 1.5% by weight to about 5% by weight of the thermoplastic composition used to form the fibers blow fused. Surfactants can be applied to the melt-blown fibers as topical treatments.
    [0042] Through the selection of certain polymers and their contents, the resulting thermoplastic composition may have thermal properties superior to those of the polypropylene homopolymers conventionally used in blow-melt wefts. For example, the thermoplastic composition is, in general, of a more amorphous nature than the polypropylene homopolymers conventionally employed in blow-molded wefts. For this reason, the crystallization rate of the thermoplastic composition is slower, as measured by its "crystallization half-time" that is, the time required for half the material to become crystalline. For example, the thermoplastic composition typically has a crystallization half-time greater than about 5 minutes, in additional embodiments, from about 5.25 minutes to about 20 minutes, and, in additional embodiments, about from 5.5 minutes to about 12 minutes, determined at a temperature of 125 ° C. In contrast, conventional polypropylene homopolymers often have a crystallization time of 5 minutes or less. In addition, the thermoplastic composition can have a melting temperature ("Tm") of about 100 ° C to about 250 ° C, in additional embodiments, from about 110 ° C to about 200 ° C, and in additional modalities, from about 140 ° C to about 180 ° C. The thermoplastic composition can also have a crystallization temperature ("Tc") (determined at a cooling rate of 510 ° C / min) from about 50 ° C to about 150 ° C, in additional modalities, from about 80 ° C to about 140 ° C, and, in yet additional embodiments, from about 100 ° C to about 120 ° C. The crystallization half-time, the melting temperature and the crystallization temperature can be determined using 10 differential scanning calorimetry ("DSC"), as is well known to those skilled in the art.
    [0043] The melt flow rate of the thermoplastic composition can also be selected within a certain range, to optimize the properties of the resulting blow-melted fibers. The melt flow rate is the weight of a polymer (in grams), which can be forced through an extrusion rheometer orifice (0.21 cm (0.0825 inches) in diameter) when subjected to a force of 2,160 grams in 10 minutes, at 230 ° C. Generally speaking, the melt flow rate is high enough to improve the processability of the melt, but not so high that it adversely interferes with the binding properties of the fibers to the absorbent material. Therefore, in most embodiments of the present invention, the thermoplastic composition has a melt flow rate of about 120 to about 6,000 grams per 10 minutes, in additional embodiments, from about 150 to about 3,000 grams per 10 minutes, and, in yet additional modalities, from about 170 to about 1,500 grams for 10 minutes, measured according to the test method ASTM D1238-E. II. Blown fused fibers
    [0044] Blown fused fibers can be single-component or multi-component. Mono-component fibers, in general, are formed from a polymer or combination of polymers extruded from a single extruder. Multicomponent fibers, in general, are formed from two or more polymers (for example, bicomponent fibers) extruded from separate extruders. The polymers can be arranged in distinct zones positioned substantially constant through the cross section of the fibers. The components can be arranged in any desired configuration, such as wrap-core, side by side, pie, island in the sea, three islands, porthole, or various other arrangements known in the art. Various methods for forming multicomponent fibers are described in U.S. Patent Nos. 4,789,592, by Taniguchi et al .; 5,336,552, by Strack et al .; 5,108,820, by Kaneko, et al .; 4,795,668, by Kruege, et al .; 5,382,400, by Pike, et al .; 5,336,552, by Strack, et al .; and 6,200,669, by Marmon, et al .; which are hereby incorporated by reference, in their entirety, by reference to them, for all purposes. Multicomponent fibers having various irregular shapes can also be formed, as described in U.S. Patent Nos. 5,277,976, by Hogle, et al .; 5,162,074, from Hills, 5,466,410, from Hills, 5,069,970, from Largman, et al .; and 5,057,368, by Laryman, et al., which are incorporated herein, in their entirety, by reference to them, for all purposes. III. Absorbent Material
    [0045] Any absorbent material can, in general, be used in the non-woven fabric of coform, such as absorbent fibers, particles, etc. In one embodiment, the absorbent material includes fibers formed by a variety of pulping processes, such as kraft pulp, sulfite pulp, thermomechanical pulp, etc. Pulp fibers may include softwood fibers having an average fiber length greater than 1 mm and, in particular, about 2 to 5 mm, based on a length weighted average. Such softwood fibers may include, but are not limited to, northern softwood, southern softwood, redwood, red cedar, Canadian pine, pine (for example, southern pines), fir (for example, black fir), their combinations, and so on. Exemplary commercially available pulp fibers suitable for the present invention include those available from Weyerhaeuser Company, Federal Way, Washington, under the designation "Weyco CF-405". Hard wood fibers, such as eucalyptus, maple, birch, poplar, and so on, can also be used. In certain instances, eucalyptus fibers may be particularly desired to increase the softness of the weft. Eucalyptus fibers can also enhance clarity, increase opacity and change the pore structure of the weft to increase its capacity for capillary action. In addition, if desired, secondary fibers obtained from recycled materials can be used, such as fiber pulp from sources, such as, for example, newspaper prints, reused cardboard, and office waste. In addition, other natural fibers can also be used in the present invention, such as abaca, sabai grass, milkweed fibers, pineapple leaf, and so on. In addition, in some cases, synthetic fibers can also be used.
    [0046] In addition to or in conjunction with pulp fibers, the absorbent material may also include a superabsorbent, which is in the form of fibers, particles, gels, etc. Generally speaking, superabsorbents are water-swellable materials capable of absorbing at least about 20 times their weight, and in some cases at least about 30 times their weight in an aqueous solution containing 0.9 percent by weight of sodium chloride. The superabsorbent can be formed from polymers and natural, synthetic and natural, modified materials. Examples of synthetic superabsorbent polymers include the alkali metal and ammonium salts of poly (acrylic acid) and poly (methacrylic acid), polyacrylamides, poly (vinyl ethers), maleic anhydride copolymers with vinyl and alpha-olefins, poly (vinyl-pyrrolidone), poly (vinyl-morpholinone), poly (vinyl alcohol), and mixtures and copolymers thereof. In addition, superabsorbents include modified natural and natural polymers, such as starch grafted with hydrolyzed acrylonitrile, starch grafted with acrylic acid, methyl cellulose, chitosan, carboxymethyl-cellulose, hydroxy-propyl-cellulose, and natural gums, such as alginates, xanthan gum, locust bean gum and so on. Mixtures of natural and fully or partially synthetic superabsorbent polymers can also be useful in the present invention. Particularly suitable superabsorbent polymers are HYSORB 8800AD (BASF from Charlotte, North Carolina, and FAVOR SXM 9300 (available from Evonik Stockhausen, Greensboro, North Carolina). IV. Coform Preparation Technique
    [0047] The coform web of the present invention, in general, is prepared by a process, in which at least one blow molding head (for example, two) is disposed next to a chute through which the absorbent material is added while the weft is forming. Some examples of such coformon preparation techniques described in U.S. Patent Nos. 10 Nos. 4,100,324, by Anderson, et al .; 5,350,624, by Georger, et al., And 5,508,102, by Georger, et al., As well as U.S. Patent Application Publications Nos. 2003/0200991, by Keck, et al., And 2007/0049153, by Dunbar, et al., All of which are incorporated herein, in their entirety by reference to them, for all purposes.
    [0048] Referring to Figure 1, for example, an embodiment of an apparatus for forming a coform web of the present invention is shown. In this embodiment, the apparatus includes a pellet hopper 12 or 12 'from an extruder 14 or 14', respectively, into which a thermoplastic propylene / α-olefin composition can be introduced. Extruders 14 and 14 'each have an extrusion screw (not shown), which is driven by a conventional drive motor (not shown). As the polymer advances through extruders 14 and 14 ', it is progressively heated to a molten state, due to the rotation of the extrusion screw by the drive motor. The heating can be carried out in a plurality of discrete steps, with its temperature being progressively raised as it advances through the discrete heating zones of the extruders 14 and 14 ', towards two blow molds 16 and 18, respectively. Blow molding molds 16 and 18 can be yet another heating zone, where the temperature of the thermoplastic resin is maintained at a high level for extrusion.
    [0049] When two or more blow molding die heads are used, as described above, it should be understood that the fibers produced from the individual die heads can be different types of fibers. In other words, one or more of the size, shape or polymeric composition may differ, and, in addition, the fibers may be single-component or multi-component fibers. For example, larger fibers can be produced by the first blow molding head, such as those having an average diameter of about 10 micrometers or more, in additional modalities, of about 15 micrometers or more, and in still modalities additional, from about 20 to about 50 micrometers, while smaller fibers can be produced by the second mold head, such as those having an average diameter of about 10 micrometers or less, in additional modalities, of about 7 micrometers or less, and, in yet additional modalities, from about 2 to about 6 micrometers. In addition, it may be desirable for each mold head to extrude approximately the same amount of polymer, such that the relative weight percentage of the coform nonwoven web material resulting from each blow mold head is substantially the same . Alternatively, it may also be desirable, if the production of relative weight is inclined, such that one mold head or the other is responsible for the majority of the coform web in terms of weight. As a specific example, for a blow-molded fibrous nonwoven material having a weight of 1.0 oz per square yard or "osy" (34 grams per square meter or "g / m2"), it may be desirable for the first blow-mold die head produces about 30 percent of the weight of the blow-molded fibrous nonwoven web material, while one or more subsequent blow-mold die heads produce the remaining 70 percent of the weight of the blow-molded fibrous nonwoven fibrous material. Generally speaking, the overall weight of the coform nonwoven web is from about 10 g / m2 to about 350 g / m2, and, more particularly, from about 17 g / m2 to about 200 g / m2, and , even more particularly, from about 25 g / m2 to about 150 g / m2.
    [0050] Each blow molding mold 16 and 18 is configured, 35 so that two streams of attenuating gas per mold converge to form a single gas stream, which carries and attenuates molten filaments 20, as they come out of small holes or holes 24 in each blow mold. The fused filaments 20 are formed in fibers, or, depending on the degree of attenuation, microfibers, of a small diameter, which are usually smaller than the diameter of the holes 24. Therefore, each blow mold 16 and 18 have a corresponding single gas stream 26 and 28, containing carried thermoplastic polymer fibers. The gas streams 26 and 28, containing polymer fibers, are aligned to converge in an impingement zone 30. Typically, the blow molding heads 16 and 18 are arranged at a certain angle with respect to the forming surface, as described in US Patent Nos. 5,508,102 and 5,350,624, by Georger, et al. Referring to Figure 2, for example, the die casting molds 16 and 18 can be oriented at an angle a, as measured from a plane "A "tangent to the two molds 16 and 18. As shown, the plane" A "is, in general, parallel to the forming surface 58 (Figure 1). Typically, each mold 16 and 18 is adjusted at an angle ranging from about 30 to about 75 degrees, in additional modes, from about 35 ° to about 60 °, and, in yet additional modes, about 45 ° at about 55 °. The molds 16 and 18 can be oriented at the same or different angles. In fact, the texture of the coform web can really be enhanced by orienting one mold at a different angle than the other mold.
    [0051] Referring again to Figure 1, absorbent fibers 32 (for example, pulp fibers) are added to the two streams 26 and 28 of thermoplastic polymer fibers 20 and 21, respectively, and in the impingement zone 30. The introduction of the absorbent fibers 32, in the two streams 26 and 28 of thermoplastic polymer fibers 20 and 21, respectively, is designed to produce a graduated distribution of absorbent fibers 32 within the combined streams 26 and 28 of thermoplastic polymer fibers. This can be done by melting a secondary gas stream 34, containing the absorbent fibers 32, between the two streams 26 and 28 of thermoplastic polymer fibers 20 and 21, so that all three gas streams converge in a controlled manner . Due to the fact that they remain relatively sticky and semi-melted after formation, the melt-blown fibers 20 and 21 can adhere and tangle simultaneously with the absorbent fibers 32, when in contact with them, to form a coherent non-woven structure.
    [0052] To carry out the fusion of the fibers, any conventional equipment can be employed, such as a collector roll arrangement 36 having a plurality of teeth 38 adapted to separate a mat or mat 40 of absorbent fibers in the individual absorbent fibers. When used, the sheets or mats 40 of fibers 32 are fed to the pick roller 36 by a roll arrangement 42. After the teeth 38 of the pick roller 36 have separated the fiber mat into separate absorbent fibers 32, the individual fibers they are transported towards the stream of thermoplastic polymer fibers through a nozzle 44. A compartment 46 encloses the collecting roller 36 and provides a passage or clearance 48 between the compartment 46 and the surface of the teeth 38 of the collecting roller 36 A gas, for example, air, is supplied to the passageway or clearance 48, between the surface of the pickup roller 36 and the compartment 46 via a gas duct 50. The gas duct 50 can enter the passageway or gap 48 at the junction 52 of the nozzle 44 and at the gap 48. The gas is supplied in sufficient quantity to serve as a means of transporting the absorbent fibers 32 through the nozzle 44. The gas supplied from the duct 50 also serves as an auxiliary in removing fib absorbent layers 32 from the teeth 38 of the pickup roller 36. The gas can be supplied by any conventional arrangement, such as, for example, an air blower (not shown). It is contemplated that additives and / or other materials can be added to or carried by the gas stream, to treat the absorbent fibers.
    [0053] Typically, the individual absorbent fibers 32 are transported through the nozzle 44 around the speed, at which the absorbent fibers 32 leave the teeth 38 of the pick roller 36. In other words, the absorbent fibers 32, when they leave the teeth 38 of the pickup roller 36 and enter the nozzle 44, in general, they maintain their speed both in magnitude and in direction from the point, where they leave the teeth 38 of the pickup roller 36. Such an arrangement, which is discussed in more detail in US Patent No. 4,100,324, to Anderson, et al.
    [0054] If desired, the speed of the secondary gas stream 34 can be adjusted to achieve coform structures of different properties. For example, when the speed of the secondary gas stream is adjusted so that it is greater than the speed of each stream 26 and 28 of the thermoplastic polymer fibers 20 and 21, when in contact with the impingement zone 30, the fibers Absorbents 32 will be incorporated into the coform nonwoven web in a gradient structure. In other words, the absorbent fibers 32 have a higher concentration between the outer surfaces of the coform nonwoven web than on the outer surfaces. On the other hand, when the speed of the secondary gas stream 34 is less than the speed of each stream 26 and 28 of the thermoplastic polymer fibers 20 and 21, upon contact with the impingement zone 30, the absorbent fibers 32 will be incorporated to the non-woven coform weave in a substantially homogeneous manner. In other words, the concentration of the absorbent fibers will be substantially the same over the entire coform nonwoven web. This is because the low speed absorbent fiber stream is drawn into a high speed thermoplastic polymer fiber stream, to intensify the turbulent mixing, which results in a consistent distribution of the absorbent fibers.
    [0055] In order to convert the composite stream 56, of thermoplastic polymer fibers 20, 21 and absorbent fibers 32, into a non-woven structure of coform 54, a collecting device is positioned in the path of the composite stream 56. The collecting device can be a forming surface 58 (for example, belt, drum, yarn, fabric, etc.), driven by rollers 60 and rotating as indicated by arrow 62 in Figure 1. The molten streams of thermoplastic polymer fibers and absorbent fibers are collected as a coherent fiber matrix on the surface of the forming surface 58, to form the non-woven web of coform 54. If desired, a vacuum box (not shown) can be employed to assist in drawing the melt-blown fibers close to the molten state over the forming surface 58. The resulting textured coform structure 54 is coherent and can be removed from the forming surface 58 as a self-supporting nonwoven material before.
    [0056] It should be understood that the present invention is by no means limited to the modalities described above. In an alternative embodiment, for example, the first and second blow mold heads can be used, which extend substantially across a forming surface, in a direction that is substantially transversal to the direction of movement of the forming surface. The mold heads can also be arranged in a substantially vertical, i.e., perpendicular, arrangement to the forming surface, so that the blown melt fibers thus produced are blown directly down over the forming surface. Such a configuration is well known in the art and is described in more detail, for example, in US Patent Application Publication No. 2007/0049153, Dunbar, et al. Furthermore, although the modalities described above employ multiple mold heads blow molding to produce fibers of different sizes, a single mold head can also be employed. An example of such a process is described, for example, in US Patent Application Publication No. 2005/0136781, by Lassig, et al., Which is incorporated herein in its entirety by reference to it for all purposes. purposes.
    [0057] As indicated above, in certain cases, it is desired to form a coform weave that is textured. Referring again to Figure 1, for example, one embodiment of the present invention employs a forming surface 58, which is foraminous in nature, so that the fibers can be extracted through the openings of the surface and form tufts similar to dimensional cloth, protruding from the material surfaces, which correspond to the openings in the forming surface 58. The foraminous surface can be provided by any material that provides sufficient openings for penetration by some of the fibers, such as a highly permeable forming thread. Interwoven yarn geometry and processing conditions can be used to change the texture or tufts of the material. The particular choice will depend on the peak size, shape, depth, "density" of surface tuft (i.e., the number of peaks or tufts per unit area), etc., desired.
    [0058] In one embodiment, for example, the yarn may have an open area of about 35% to about 65%, in additional modalities, from about 40% to about 60%, and, in yet additional modalities, from about 45% to about 55%. An exemplary high open area forming surface is FORMTECHTM 6 forming wire manufactured by Albany International Co., of Albany, New York. Such a wire has a "mesh count" of about six strings per six strings per square inch (about 2.4 by 2.4 strings per square centimeter), that is, resulting in about 36 foramens or "holes" per square inch (about 5.6 per square centimeter) and therefore capable of forming about 36 tufts or peaks in the material per square inch (about 5.6 peaks per square centimeter). The FORMTECHTM 6 yarn also has a warp diameter of about 1 millimeter of polyester, a shute diameter of about 1.07 millimeters of polyester, a nominal air permeability of approximately 41.8 m3 / min (1,475 fe / min), a nominal caliber of about 0.2 centimeters (0.08 inches) and an open area of approximately 51%. Another example forming surface, available from Albany International Co., is the FORMTECHTM 10 forming yarn, which has a mesh count of about 10 strings per 10 strings per square inch (about 4 by 4 strings per square centimeter) , that is, resulting in about 100 foramina or "holes" per square inch (about 15.5 per square centimeter), and therefore capable of forming about 100 tufts or peaks per square inch (about 15.5 peaks per square centimeter) in the material. Yet another suitable training thread is FORMTECHTM 8, which has an open area of 47% and is also available from Albany International. Obviously, other forming wires and surfaces (eg drums, plates, mats, etc.) can be employed. For example, mats can be used with depressions etched on the surface, such that coform fibers fill the depressions, to result in tufts that correspond to the depressions. The depressions (tufts) can take various shapes, including, but not limited to, circles, squares, rectangles, spirals, ribs, lines, clouds, and so on. In addition, 5 surface variations can include, but are not limited to, alternating twisting patterns, alternating string dimensions, release coatings (e.g., silicones, fluorochemicals, etc.), static dissipation treatments, and the like. Still other suitable foraminous surfaces, which can be employed, are described in U.S. Patent Application Publication No. 2007/0049153, by Dunbar, et al. Regardless of the particular texturing method employed, the tufts formed by the blow-melted fibers of the present invention are better able to retain the desired shape and surface contour. Namely, because the blown-melt fibers crystallize at a relatively low rate, they are soft when deposited over the forming surface, which allows them to drape over, and conform to, the contours of the surface. After the fibers crystallize, they are then able to maintain their shape and form tufts. The size and shape of the resulting tufts depend on the type of forming surface used, the types of fibers deposited on it, the vacuum volume of wire air used below to extract the fibers over and on the forming surface and other factors related. For example, tufts can project from the surface of the material in the range of about 0.25 mm to at least about 9 mm, and, in additional modalities, from about 0.5 mm to about 3 mm. Generally speaking, the tufts are filled with fibers and thus have desirable resilience, useful for wiping and scrubbing.
    [0059] Figure 3 shows an illustration of a cross section of a textured coform web 100, showing a first outer surface 122 and a second outer surface 35 128. At least one of the outer surfaces has a three-dimensional surface texture. In Figure 3, for example, the first outer surface 122 has a three-dimensional surface texture, which includes tufts or peaks 124, which extend upwards from the plane of the coform material. An indication of the magnitude of the three-dimensionality on the textured outer surface (s) of the coform web is the peak-to-valley ratio, which is calculated as the ratio of the overall thickness "T" divided by the depth of the valley "D". When textured according to the present invention, the coform web typically has a peak-to-valley ratio of about 5 or less, in additional embodiments, from about 0.1 to about 4, and, in yet additional embodiments, from about 0.5 to 3. The number and arrangement of tufts 24 can vary widely, depending on the desired end use. In particular modalities that are more densely textured, the textured coform web will have about 2 to about 70 tufts per square centimeter, and in other modalities, about 5 and 50 tufts per square centimeter. In certain modalities that are less densely textured, the textured coform web will feature from about 100 to about 20,000 tufts per square meter, and, in additional modalities, will feature from about 200 to about 10,000 tufts per square meter. The textured coform web can also exhibit a three-dimensional texture on the second web surface. This will be especially the case for lighter weight materials, such as those weighing less than about 70 grams per square meter, due to "mirroring", with the second surface of the material showing displacement of peaks or between peaks on the first external surface of the material. In this case, the valley depth D is measured for both outer surfaces, as above, and are then added together to determine an overall valley depth of material. V. Articles
    [0060] The resilient coform nonwoven fabric can be used on a wide variety of articles. For example, the web can be incorporated into an "absorbent article", which is capable of absorbing water and other fluids. Examples of some absorbent items include, but are not limited to, absorbent personal care items, such as diapers, training pants, absorbent underwear, incontinence items, feminine hygiene products (eg sanitary napkins), swimwear , baby wipes, handkerchiefs for gloves, and so on; medical absorbent articles, such as garments, fenestration materials, seat cushions, bed cushions, bandages, absorbent curtains and medical wipes; food service cloths; clothing items; purses, and so on. Suitable materials and processes for forming such articles are well known to those skilled in the art. Various examples of such absorbent articles are described in U.S. Patent Nos. 5,649,916 to DiPalma, et al .; 6,110,158 to Kielpikowski; 6,663,611 by Blaney, et al., Which are incorporated herein in their entirety by reference to them for all purposes. Still other suitable articles are described in U.S. Patent Application Publication No. 2004/0060112 Al de Fell, et al., As well as in U.S. Patent Nos. 4,886,512 to Damico, et al .; 5,558,659 to Sherrod, et al .; 6,888,044 to Fell, et al. and 6,511,465 by Freiburger, et al., all of which are incorporated herein in their entirety by reference to them for all purposes. When used in the absorbent article, the resilient coform of the present invention can form an absorbent core component or any other absorbent component of the absorbent article as is well known in the art.
    [0061] As an example, the resilient coform nonwoven fabric can be used as an absorbent member in a feminine hygiene article. As shown in Figure 8, a feminine hygiene article includes a bark tape 1, which is fixed in an adhesive way, by means of a garment fixing adhesive 2 to a layer of film or barrier plate facing the garment 3, on one side. The other side of the plate 3 is attached to an absorbent layer 5 with construction adhesive 4. The adhesive layer 5 is attached to a body side coating 6. The non-woven web of resilient coform is suitably used as the absorbent layer 5. Desirably, the use of the non-woven web of resilient coform will inhibit the piling up of the product when it is used, thus improving overall efficiency and reducing leakage. Other configurations suitable for forming personal care articles with absorbent core materials are well known to those skilled in the art. In another desirable embodiment, the resilient coform nonwoven web has a textured surface. The textured surface is desirably positioned towards the coating on the side of the body 5, to promote faster fluid absorption and higher absorbance of the absorbent core.
    [0062] In another particular embodiment of the present invention, the coform web is used to form a scarf. The scarf may be formed entirely from the coform weave or it may contain other materials, such as films, non-woven weaves (for example, spinning weaves, blow-fused weaves, carded weave materials, other coform weaves, air-laid wefts, etc.), paper products, and so on. In one embodiment, for example, two layers of a textured coform web can be laminated together to form the scarf, as described in US Patent Application Publication No. 2007/0065643, by Kopacz, which is incorporated herein, in its entirety by reference, for all purposes. In such embodiments, one or both layers can be formed from the coform web of the present invention. Various dispensers, containers and systems suitable for handkerchief delivery are described in U.S. Patent Nos. 5,785,179, by Buczwinski, et al .; 5,964,351, by Zander; 6,030,331, by Zander; 6,158,614, by Haynes, et al .; 6,269,969, by Huang, et al .; 6,269,970, by Huang, et al .; and 6,273,359, by Newman, et al .; which are hereby incorporated by reference, in their entirety, by reference to them, for all purposes.
    [0063] In certain embodiments of the present invention, the handkerchief is a "moistened" or "pre-humidified" handkerchief, due to the fact that it contains a liquid solution for cleaning, disinfecting, sanitizing, etc. Particular liquid solutions are not critical and are described in more detail in U.S. Patent Nos. 35 6,440,437, to Krzysik, et al .; 6,028,018, by Amundson, et al .; 5,888,524, to Cole; 5,667,635, to Win, et al .; and 5,540,332, by Kopacz, et al., which are incorporated herein, in their entirety, by reference to them, for all purposes.
    [0064] The present invention can be better understood with reference to the following examples. Test Methods Melting Mass Flow Rate:
    [0065] The melt flow rate ("MFR") is the weight of a polymer (in grams) forced through an extrusion rheometer orifice (0.0825 inches in diameter) when subjected to a load of 2,160 grams in 10 minutes, at 230 ° C. Unless otherwise indicated, the melt flow rate was measured according to the ASTM D1238-E test method. Thermal Properties:
    [0066] The melting temperature and the crystallization temperature were determined by differential scanning calorimetry (DSC) according to ASTM D-3417. The differential scanning calorimeter was a DSC Q100 Differential Scanning Calorimeter, which was equipped with a liquid nitrogen cooling accessory and a UNIVERSAL ANALYSIS 2000 (version 4.6.6) analysis computer program, both of which are available from from TA Instruments Inc., New Castle, Delaware. To avoid handling samples directly, special tweezers or other tools were used. The samples were placed in an aluminum pan and weighed to an accuracy of 0.01 milligram on an analytical balance. A lid was folded over the material sample over the pan. Typically, the resin pellets were placed directly in the weighing pan, and the fibers were cut to accommodate positioning on the weighing pan and the cover by the lid.
    [0067] The differential scanning calorimeter was calibrated using an Indian metal standard and a baseline correction was performed, as described in the operating manual for the differential scanning calorimeter. A sample of material was placed in the test chamber of the differential scanning calorimeter for testing, and an empty pan is used as a reference. All testing took place with a 55 cubic centimeter per minute nitrogen purge (industrial grade) on the test chamber. For resin pellet samples, the heating and cooling program was a 2-cycle test, which started with a chamber equilibrium to -25 ° C, followed by a first heating period at a 10 ° heating rate. C per minute to a temperature of 200 ° C, followed by equilibrating the sample to 200 ° C for 3 minutes, followed by a first cooling period at a cooling rate of 10 ° C per minute to a temperature of -25 ° C , followed by equilibrating the sample at -25 ° C for 3 minutes, and then a second heating period at a heating rate of 10 ° C per minute to a temperature of 200 ° C. All testing took place with a 55 cubic centimeter per minute nitrogen purge (industrial grade) on the test chamber. The results were then evaluated using the UNIVERSAL ANALYSIS 2000 analysis computer program, which identified and quantified the melting and crystallization temperatures. EXAMPLES
    [0068] Several samples of coform wefts were from two heated strands of fiber and a single stream of fibrized pulp fibers, described above and shown in Figure 1. In several, the blown melt fibers were formed from the polymer compositions: 1. The polymer composition of Example 1 was a propylene homopolymer having a density of 0.91 g / cm3, a melt flow rate of 1,200 g / 10 minutes (230 ° C, 2, 16 Kg), a crystallization temperature of 113 ° C and a melting temperature of 156 ° C, which is available as MetoceneTM MF650X, from Basell Polyolefins. 2. The polymer composition of Example 2 was a combination of 75% by weight of propylene homopolymer (AchievelM 6936G1) and 25% by weight of propylene / ethylene copolymer (VistamaxxTM 2370, density of 0.868 g / cm3, melt flow of 200 g / 10 minutes (230 ° C, 2.16 kg)), with a density of 0.89 g / cm3 and melt flow rate of 540 g / 10 minutes (230 ° C, 2.16 Kg), which are available from ExxonMobil Chemical Corp. 3. The polymer composition of Example 3 was an olefin based elastomer (VistamaxxTM 2330, density of 0.868 g / cm3, melt flow rate of 290 g / 10 minutes (230 ° C, 2.16 kg), ethylene content of 13.0% by weight), which is available from ExxonMobil Chemical Corp.
    [0069] Each of the polymer compositions additionally contained 3.0% by weight of surfactant (IRGASURF HL 560, available from Ciba). The pulp fibers were fully treated southern softwood pulp, obtained from Weyerhaeuser Co., Federal Way, Washington, under the designation "CF-405".
    [0070] For each Example, the polymer for each stream of blow-melted fibers was supplied to the respective blow-molds at a rate of 0.9 kg (2.0 pounds) of polymer per 2.54 cm (1 inch) ) of mold tip per hour, through holes of 0.5 cm (0.020 inches) in diameter, in order to achieve a content of 50% by weight blown melt fibers. The distance from the impingement zone to the forming wire (that is, the forming height) was approximately 30.5 cm (12 inches) and the distance between the tips of the blow molding molds was approximately 6 inches . The blow molding mold, positioned upstream from the pulp fiber stream, was oriented at an angle of 48 ° to the pulp stream, while the other blow molding mold (positioned downstream from the pulp stream) was oriented between a 48 ° angle in relation to the pulp stream. The forming wire was FORMTECHTM 8 (Albany International Co.). To achieve different types of tufts, rubber mats were placed on the upper surface of the forming wire. Such a mat was approximately 0.95 cm thick and contained holes arranged in a hexagonal arrangement. The holes were approximately 0.64 cm in diameter and spaced approximately 0.95 cm apart (center to center). Mats of other patterns (for example, clouds) were also used. A vacuum box was positioned below the forming wire to assist in weft deposition and was adjusted to 76.2 cm (30 inches) of water.
    [0071] To demonstrate the resilient nature of coform webs, samples from each Example were subjected to a "wrinkle" test. Each sample was 7.62 cm (three inches) by 17.78 cm (seven inches). The test was carried out on both dry and moist samples. The wetted samples had 3 times their weight in water added to the sample. Each sample was compressed by slightly rolling it into the hand of a tester, where the sample was kept for 10 seconds. The samples were then released, shaken slightly and placed on a board. The samples were not subsequently smoothed in any way. Figure 4 shows a photo of the samples from Example 1 before the crease. Figure 5 shows a photo of the samples in Example 1 after completing the crumpling test. Figure 6 shows a photo of the samples in Example 3 before the crease. Figure 7 shows a photo of the samples in Example 3 after completing the crumpling test. As can be seen in Figures 4-7, the samples in Example 3 were much more resilient, that is, they opened more smoothly after the crumpling test, than those in Example 1. It was also found that the samples in Example 2 behaved similarly to the samples in Example 3.
    [0072] Although the invention has been described in detail with respect to its specific modalities, it will be appreciated that those skilled in the art, when they reach an understanding of the above, will be able to readily conceive changes, variations and equivalents to these modalities. Consequently, the scope of the present invention must be assessed as that of the appended claims and any equivalents thereto. In addition, it should be noted that any given track, shown here, is intended to include any and all minor tracks included. For example, a range of 45-90 would also include 50-90; 45-80; 46-89 and the like.
    权利要求:
    Claims (15)
    [0001]
    1. Resilient coform non-woven fabric, characterized by comprising a matrix of fibers melted by blow and an absorbent material, with the fibers melted by blow constitute 45% by weight to 99% by weight of the weave and the absorbent material constitutes 1 % by weight to 55% by weight of the weft, and additionally, the melt-blown fibers are formed from a thermoplastic composition, which contains at least one propylene / α-olefin copolymer having a propylene content of 60% in mol to 99.5 mol% and an α-olefin content of 0.5 mol% to 40 mol%, with the copolymer additionally having a density of 0.86 to 0.90 grams per cubic centimeter and the The composition has a melt flow rate of 120 to 6,000 grams per 10 minutes, determined at 230 ° C.
    [0002]
    2. Resilient COFORM non-woven fabric, according to claim 1, characterized by the fact that α-olefin includes ethylene.
    [0003]
    3. Resilient COFORM non-woven fabric, according to claim 1, characterized by the fact that propylene constitutes 85% by mol to 98% by mol of the copolymer and α-olefin constitutes from 2% by mol to 15% by mol of the copolymer.
    [0004]
    4. Resilient COFORM non-woven fabric, according to claim 1, characterized by the fact that the copolymer has a density of 0.861 to 0.89 grams per cubic centimeter and, preferably, from 0.862 to 0.88 grams per cubic centimeter .
    [0005]
    5. Resilient COFORM non-woven fabric, according to claim 1, characterized by the fact that the propylene copolymer is catalyzed in a single site.
    [0006]
    6. Resilient COFORM non-woven fabric, according to claim 1, characterized by the fact that the propylene / α-olefin copolymer constitutes from 15% by weight to 99.9% by weight of the thermoplastic composition.
    [0007]
    7. Resilient COFORM non-woven fabric according to claim 1, characterized by the fact that the absorbent material comprises pulp fibers and / or in which the absorbent material comprises superabsorbent polymer particles or superabsorbent polymer fibers.
    [0008]
    8. Resilient COFORM non-woven fabric, according to claim 1, characterized by the fact that the blown melt fibers constitute 50% by weight to 90% by weight of the weave and the absorbent material constitutes 10% by weight at 50 % by weight of the frame.
    [0009]
    9. Absorbent personal care article comprising the resilient COFORM nonwoven web as defined in claim 1, characterized by the fact that the personal care article preferably comprises a body-facing coating, an absorbent core comprising the resilient COFORM nonwoven web as defined in claim 1, and a plate facing the garment.
    [0010]
    10. Method of forming a resilient COFORM non-woven web as defined in claim 1, characterized by comprising: the fusion together of a stream of an absorbent material with a stream of fibers melted by blowing to form a composite stream, Blow-melt fibers make up 45% by weight to 99% by weight of the weft and the absorbent material makes up from 1% by weight to 55% by weight of the weft, with additionally the blow-fused fibers are formed from a composition thermoplastic, containing at least one propylene / α-olefin copolymer with a propylene content of 60% by mol to 99.5% by mol and an α-olefin content by 0.5% by mol to 40% by mol , the copolymer having an additional density of 0.86 to 0.90 grams per cubic centimeter and the composition has a melt flow rate of 120 to 6000 grams per 10 minutes, determined at 230 ° C; and after that, collecting the composite stream on a forming surface, to form a resilient COFORM nonwoven web.
    [0011]
    11. Method according to claim 10, or weft according to claim 1, characterized in that the melt flow rate of the composition is 170 to 1,500 grams for 10 minutes.
    [0012]
    12. Method according to claim 10, or weft according to claim 1, characterized in that the thermoplastic composition comprises from 0.001% by weight to 15% by weight of a surfactant.
    [0013]
    13. Method according to claim 10, characterized by the fact that the stream of absorbent material is melted together with the first and second strands of blow-melted fibers.
    [0014]
    14. Method according to claim 10, characterized in that the first stream and the second stream of blow-fused fibers are supplied from the respective first and second mold heads, each of which is oriented at an angle 45 ° to 55 °, in relation to a plane tangent to the mold heads.
    [0015]
    15. Method, according to claim 10, or weft, according to claim 1, characterized by the fact that the weft defines an external surface presenting a three-dimensional texture, which includes a plurality of peaks and valleys.
    类似技术:
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    BR112017008700B1|2021-04-06|NON-WOVEN BLANKET, COMPOSITE AND ABSORBENT ARTICLE
    US20110152164A1|2011-06-23|Wet Wipe Having Improved Cleaning Capabilities
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    BR112016011370B1|2022-02-08|NON-WOVEN COMPOSITE, MULTI-LAYER LAMINATED, AND ABSORBENT ARTICLE
    同族专利:
    公开号 | 公开日
    KR20120106768A|2012-09-26|
    CN102791914B|2015-07-29|
    EP2516710A2|2012-10-31|
    WO2011077277A3|2011-11-24|
    WO2011077277A2|2011-06-30|
    EP2516710A4|2013-05-22|
    AU2010334491A1|2012-06-14|
    BR112012014276A2|2017-03-01|
    AU2010334491B2|2013-11-14|
    EP2516710B1|2016-01-27|
    CN102791914A|2012-11-21|
    US20110152808A1|2011-06-23|
    US10363338B2|2019-07-30|
    US20160228596A1|2016-08-11|
    MX2012007197A|2012-07-10|
    RU2012131064A|2014-01-27|
    RU2527724C2|2014-09-10|
    KR101777433B1|2017-09-11|
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    法律状态:
    2019-02-12| B06T| Formal requirements before examination|
    2020-05-26| B07A| Technical examination (opinion): publication of technical examination (opinion)|
    2020-09-29| B09A| Decision: intention to grant|
    2020-12-29| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 10 (DEZ) ANOS CONTADOS A PARTIR DE 29/12/2020, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US12/643,051|US20110152808A1|2009-12-21|2009-12-21|Resilient absorbent coform nonwoven web|
    US12/643,051|2009-12-21|
    PCT/IB2010/055250|WO2011077277A2|2009-12-21|2010-11-17|Resilient absorbent coform nonwoven web|
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