阅读说明：本技术 一体式非织造材料 (Integrated nonwoven material ) 是由 里查德·布克 托马斯·J·卡瓦诺 亚采克·K·杜特凯维奇 于 2019-09-19 设计创作，主要内容包括：本文提供了具有至少一个包含纤维素纤维的层的非织造材料。该非织造材料包括具有高毛细管作用的粘结的天然纤维素纤维。该非织造材料适用于多种应用,包括吸收产品和具有计量释放液体的预润湿清洁材料。(Provided herein are nonwoven materials having at least one layer comprising cellulosic fibers. The nonwoven material comprises bonded natural cellulose fibers having high capillary action. The nonwoven material is suitable for use in a variety of applications, including absorbent products and pre-moistened cleaning materials with metered release of liquids.)

1. An integrally airlaid nonwoven material comprising at least one fibrous layer, wherein the at least one fibrous layer comprises cellulosic fibers and synthetic fibers, and wherein the cellulosic fibers comprise bonded natural cellulosic fibers having a coarseness of less than about 15mg/100 m.

2. The integrally airlaid nonwoven material of claim 1, wherein the bonded natural cellulose fibers have a coarseness in the range of about 4.2mg/100m to about 8.8mg/100 m.

3. The integrally airlaid nonwoven material of claim 2, wherein the bonded natural cellulose fibers have a coarseness of about 6.5mg/100 m.

4. The integrally airlaid nonwoven material of claim 1, wherein the bonded natural cellulose fibers have a Kajaani weighted average length of about 1.5mm or less.

5. The integrally airlaid nonwoven material of claim 1, wherein the bonded natural cellulose fibers comprise hardwood fibers.

6. The integrally airlaid nonwoven material of claim 5, wherein the bonded natural cellulose fibers comprise eucalyptus pulp.

7. The integrally airlaid nonwoven material of claim 1, wherein the synthetic fibers comprise bicomponent binder fibers.

8. The integrally airlaid nonwoven material of claim 7, wherein the bicomponent binder fibers comprise eccentric bicomponent fibers, and wherein the bicomponent binder fibers comprise a polyethylene-based sheath and a core comprising a polymer having a melting point greater than about 200 ℃.

9. The integrally airlaid nonwoven material of claim 1, wherein the integrally airlaid nonwoven material comprises at least two fibrous layers.

10. The integrally airlaid nonwoven material of claim 9, further comprising a layer of cellulosic fibers.

11. The integrally airlaid nonwoven material of claim 1, wherein at least one fibrous layer is coated on at least a portion of its surface with a binder.

12. The integrally airlaid nonwoven material of claim 1, wherein at least one fibrous layer is coated on at least a portion of its surface with an adhesive.

13. The integrally airlaid nonwoven material of claim 1, wherein said nonwoven material further comprises a layer comprising synthetic fibers.

14. The integrated airlaid nonwoven material of claim 1, wherein the nonwoven material further comprises a cleaning formulation.

15. The integrated airlaid nonwoven material of claim 14, wherein the cleaning formulation is water-based.

16. An integrally airlaid nonwoven material comprising two fibrous layers, wherein a first layer comprises cellulosic fibers and synthetic fibers, and wherein a second layer comprises cellulosic fibers and synthetic fibers.

17. The integrally airlaid nonwoven material of claim 16, wherein the second layer is coated on at least a portion of its surface with a binder.

18. An integrally airlaid nonwoven material comprising two fibrous layers, wherein a first layer comprises synthetic fibers, and wherein the second layer comprises cellulosic fibers and synthetic fibers, and wherein the second layer is coated on at least a portion of its surface with a binder.

19. An integrally air-laid nonwoven material comprising three fibrous layers,

wherein the first layer comprises synthetic fibers, the second layer comprises cellulosic fibers and synthetic fibers, the third layer comprises cellulosic fibers and synthetic fibers,

wherein the second layer is coated on at least a portion of its surface with an adhesive, and

wherein the first layer is coated on at least a portion of its surface with an adhesive.

1. Field of the invention

The presently disclosed subject matter relates to nonwoven materials that can retain relatively large amounts of liquid under wet conditions. More particularly, the presently disclosed subject matter relates to nonwoven materials that retain liquid in a dry state after absorption and provide metered release of liquid in a wet state.

2. Background of the invention

Nonwoven structures are important in a wide range of consumer products, such as absorbent articles, including baby diapers, adult incontinence products, sanitary napkins, wipes, and the like. Such nonwoven structures may include various layers and/or components configured to direct and control acquisition and retention of liquids. Each of these layers and/or components may include a particular network of fibers that provide the desired functionality.

Pre-moistened mops and wipes are known in the art, however, their material composition can deplete stored liquid relatively quickly and thus become unusable in an unacceptably short time and/or after cleaning of relatively small areas. This has led consumers to purchase and use more pre-moistened cleaning products. Furthermore, disposable pre-moistened cleaning materials are inefficient when scrubbing action is required, which makes consumers dependent on other or additional products.

Thus, there remains a need in the art for nonwoven materials that can absorb and gradually release liquids so as to be able to clean a greater surface area. Furthermore, there remains a need for pre-moistened cleaning materials with improved scrubbing and scrubbing characteristics. The presently disclosed subject matter addresses these and other needs.

3. Summary of the invention

The presently disclosed subject matter provides nonwoven materials comprising bonded natural cellulosic fibers characterized by high capillary action and bonded synthetic fibers. The bonded natural cellulosic fibers may include, for example, monocomponent polyester fibers or bicomponent binder fibers. The nonwoven material of the presently disclosed subject matter provides relatively high liquid retention and metered release of the liquid.

In certain non-limiting embodiments, an integrally airlaid nonwoven material is provided. The nonwoven material may comprise at least one fibrous layer. The at least one fibrous layer may comprise cellulosic fibers and synthetic fibers. The cellulosic fibers may comprise bonded natural cellulosic fibers having a coarseness of less than about 15mg/100 m.

In certain non-limiting embodiments, the bonded natural cellulosic fibers can have a coarseness ranging from about 4.2mg/100m to about 8.8mg/100 m.

In certain non-limiting embodiments, the bonded natural cellulose fibers may have a coarseness of about 6.5mg/100 m.

In certain non-limiting embodiments, the bonded natural cellulosic fibers can have a Kajaani weighted average length of about 1.5mm or less.

In certain non-limiting embodiments, the bonded natural cellulose fibers may comprise hardwood fibers.

In certain non-limiting embodiments, the bonded natural cellulose fibers may include eucalyptus pulp.

In certain non-limiting embodiments, the synthetic fibers may comprise bicomponent binder fibers.

In certain non-limiting embodiments, the bicomponent binder fibers may comprise eccentric bicomponent fibers. The bicomponent binder fiber may include a polyethylene-based sheath and a core comprising a polymer having a melting point greater than about 200 ℃.

In certain non-limiting embodiments, the integrally airlaid nonwoven material can comprise at least two fibrous layers.

In certain non-limiting embodiments, the integrally airlaid nonwoven material can further comprise a layer of cellulosic fibers.

In certain non-limiting embodiments, at least one fibrous layer may be coated on at least a portion of its surface with a binder.

In certain non-limiting embodiments, at least one fibrous layer may be coated on at least a portion of its surface with an adhesive.

In certain non-limiting embodiments, the nonwoven material may also include a layer that includes synthetic fibers.

In certain non-limiting embodiments, the nonwoven material may further comprise a cleaning formulation.

In certain non-limiting embodiments, the cleaning formulation may be water-based.

In certain non-limiting embodiments, an integrally airlaid nonwoven material comprising two fibrous layers is provided. The first layer may include cellulosic fibers and synthetic fibers. The second layer may include cellulosic fibers and synthetic fibers.

In certain non-limiting embodiments, the second layer may be coated on at least a portion of its surface with a binder.

In certain non-limiting embodiments, an integrally airlaid nonwoven material is provided. The first layer may comprise synthetic fibers. The second layer may include cellulosic fibers and synthetic fibers. The second layer may be coated on at least a portion of its surface with an adhesive.

In certain non-limiting embodiments, an integrally airlaid nonwoven material comprising three fibrous layers is provided. The first layer may comprise synthetic fibers. The second layer may include cellulosic fibers and synthetic fibers. The third layer may include cellulose fibers and synthetic fibers. The second layer may be coated on at least a portion of its surface with an adhesive. The first layer may be coated on at least a portion of its surface with an adhesive.

The foregoing has outlined rather broadly the features and technical advantages of the present application in order that the detailed description that follows may be better understood.

Additional features and advantages of the patent application will be described hereinafter which form the subject of the claims of the application. It should be appreciated by those skilled in the art that the conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present application. It should also be realized by those skilled in the art that such equivalent constructions do not depart from the spirit and scope of the application as set forth in the appended claims. The novel features which are believed to be characteristic of the application, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description.

4. Description of the drawings

Figure 1 provides an apparatus for quantitative measurement of liquid release from a prewetted nonwoven according to example 3;

FIG. 2 provides a cleaning mode according to example 3, wherein a sweeping tool is moved over the floor base fixture of the apparatus of FIG. 1 during testing of the prewetted nonwoven; and is

Figure 3 provides the equipment used during the soil release test of the prewetted and dried nonwoven according to example 4 and example 12, respectively.

5. Detailed description of the preferred embodiments

The presently disclosed subject matter provides a multi-layer unitary absorbent nonwoven material that can be used in a variety of applications. In particular, the nonwoven materials described herein absorb and store liquids, and can be used as absorbent materials for cleaning liquids from hard surfaces. Alternatively, the nonwoven material may be used in pre-moistened cleaning materials such as pre-moistened wipes and mops, as the nonwoven material may absorb relatively large amounts of liquid and further provide metered release of the liquid. The presently disclosed subject matter also provides methods for making such nonwoven materials. These and other aspects of the disclosed subject matter are discussed in more detail in the detailed description and examples.

Definition of

The terms used in this specification generally have their ordinary meaning in the art, both in the context of the present subject matter and in the specific context in which each term is used. Certain terms are defined below to provide additional guidance in describing the compositions and methods of the presently disclosed subject matter and how to make and use them.

As used in this specification and the appended claims, the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a compound" includes mixtures of compounds.

The term "about" or "approximately" means within an acceptable error range for the particular value as determined by one of ordinary skill in the art, which error range will depend in part on the manner in which the value is measured or determined, i.e., the limitations of the measurement system. For example, "about" can mean within 3 or greater than 3 standard deviations, as practiced in the art. Alternatively, "about" may mean a range of up to 20%, preferably up to 10%, more preferably up to 5%, and still more preferably up to 1% of a given value. Alternatively, particularly with respect to a system or process, the term can mean within an order of magnitude of a value, preferably within 5 times a value, and more preferably within 2 times a value.

As used herein, the term "weight percent" means (i) the amount by weight of an ingredient/component within a material expressed as a weight percent of a layer of material; or (ii) the amount by weight of the ingredients/components within the material expressed as a weight percentage of the final nonwoven material or product.

As used herein, the term "basis weight" refers to the amount of a compound by weight on a given area. Examples of units of measure include grams per square meter, as identified by the acronym "gsm".

As used herein, "nonwoven material" refers to a class of materials including, but not limited to, textiles or plastics. Nonwoven materials are sheet or web structures made of fibers, filaments, molten plastic, or plastic films that are mechanically, thermally, or chemically bonded together. Nonwoven materials are fabrics made directly from a web of fibers without the need for yarn preparations to be woven or knitted. In the nonwoven, the assembly of fibers is held together by one or more of the following: (1) by mechanical interlocking in a random web or mat; (2) by fusing the fibers, as in the case of thermoplastic fibers; or (3) by bonding with an adhesive medium such as a natural or synthetic resin or adhesive.

As used herein, the term "cellulose" or "cellulosic" includes any material having cellulose as a major constituent, and in particular, comprising at least 50% by weight of cellulose or a cellulose derivative. Thus, the term includes cotton, typical wood pulp, cellulose acetate, rayon, thermochemical wood pulp, chemical wood pulp, debonded chemical wood pulp, dairy floss, microcrystalline cellulose, microfibrillated cellulose and the like.

As used herein, the term "fiber" or "fibrous" refers to a particulate material in which the ratio of the length to the diameter of such particulate matter is greater than about 10. Conversely, "non-fibrous" or "non-fibrous" material refers to particulate material wherein the ratio of the length to the diameter of such particulate matter is about 10 or less.

As used herein, the phrase "high-core bicomponent fiber" refers to a bicomponent fiber having a core-sheath configuration, wherein the core comprises greater than 50% by weight of the fiber. In other words, it can be said that high-core bicomponent fibers have a core to sheath ratio greater than 1: 1.

As used herein, the term "metered release" refers to a slow migration of liquid in a premoistened wipe resulting in a gradual release of liquid from the multi-layer nonwoven structure.

As used herein, the term "Kajaani weighted average length" refers to the fiber length as determined by the Kajaani fiber length apparatus.

As used herein, the term "capillary action" refers to the ability of a liquid to flow in a confined space without the aid of or even in opposition to an external force, such as gravity. Section 2.1.3, "Surface Properties and Capillary testing," published in Nonwove Structures for Absorption of Body Fluids (2003), ISBN 2-930159-46-4 (published by Edana-Brussels, Belgium) provides additional disclosure regarding Capillary action.

As used herein, the term "coarseness" or "fiber coarseness" refers to the weight per fiber length and may be expressed in units of mg/100 m. The coarseness depends on the fiber diameter, cell wall thickness, cell wall density and fiber cross section. Generally, thinner wood fibers, such as hardwood fibers, are characterized by a lower coarseness, while thicker wood fibers, such as softwood fibers, are characterized by a higher coarseness.

Fiber

The nonwoven material of the presently disclosed subject matter includes synthetic fibers and cellulosic fibers.

Synthetic fiber

The presently disclosed subject matter contemplates the use of synthetic fibers. Non-limiting examples of synthetic fibers suitable for use in the present disclosure include fibers made from a variety of polymers including, by way of example and not limitation, acrylic polymers, polyamides (including, but not limited to, nylon 6, nylon 6/6, nylon 12, polyaspartic acid, polyglutamic acid), polyamines, polyimides, polyacrylics (including, but not limited to, esters of polyacrylamides, polyacrylonitriles, methacrylic acids, and acrylic acids), polycarbonates (including, but not limited to, poly (bisphenol a carbonate), poly (propylene carbonate), polydienes (including, but not limited to, polybutadiene, polyisoprene, polynorbornene), polyepoxides, polyesters (including, but not limited to, polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polycaprolactone, polyglycolide, polylactide, polylactides, copolymers, blends, Polyhydroxybutyrate, polyhydroxyvalerate, polyethylene adipate, polybutylene adipate, polypropylene succinate, polyethers including but not limited to polyethylene glycol (polyethylene oxide), polybutylene glycol, polypropylene oxide, polyoxymethylene (paraformaldehyde), polytetramethylene ether (polytetrahydrofuran), polyepichlorohydrin, polyfluorocarbons, formaldehyde polymers including but not limited to urea-formaldehyde, melamine-formaldehyde, phenol-formaldehyde, natural polymers including but not limited to cellulose, chitosan, lignin, waxes, polyolefins including but not limited to polyethylene, polypropylene, polybutylene (polybutylene), polybutylene (polybutenetene), polyoctene, polyphenylenes including but not limited to polyphenylene oxide, polyphenylene sulfide, polyphenylene ether sulfone, silicon-containing polymers including but not limited to polydimethylsiloxane, polybutylene oxide, polyphenylene ether sulfone, Polycarbomethylsilane), polyurethanes, polyvinyls (including, but not limited to, polyvinyl butyral, polyvinyl alcohol, esters and ethers of polyvinyl alcohol, polyvinyl acetate, polystyrene, polymethylstyrene, polyvinyl chloride, polyvinylpyrrolidone, polymethylvinyl ether, polyethylvinyl ether, polyvinylmethylketone), polyacetals, polyarylates, and copolymers (including, but not limited to, polyethylene-vinyl acetate copolymers, polyethylene-acrylic acid copolymers, polybutylene terephthalate-polyethylene terephthalate copolymers, polylauryllactam-block-polytetrahydrofuran), polybutylene succinate and polylactic acid-based polymers, derivatives thereof, copolymers thereof, and the like, or combinations thereof. In certain embodiments, these polymeric materials may be used in monocomponent fibers. Alternatively, two or more polymeric materials may be used together in a bicomponent fiber, such as a high-core bicomponent fiber or a low-core bicomponent fiber.

In certain non-limiting embodiments, the synthetic fibers can comprise monocomponent fibers (i.e., a single synthetic polymer or copolymer component in the fiber), bicomponent fibers (i.e., two synthetic polymer or copolymer components in the fiber), multicomponent fibers (i.e., more than two synthetic polymer or copolymer components in the fiber), or combinations thereof.

In certain non-limiting embodiments, the synthetic fibers may comprise monocomponent fibers, wherein the monocomponent fibers may comprise polyethylene, polypropylene, polyester, polylactic acid (PLA), the like, or combinations thereof.

In certain non-limiting embodiments, the synthetic fibers may comprise bicomponent fibers. Generally, bicomponent fibers can have a core and a sheath surrounding the core, wherein the core and the sheath comprise different polymers. For example, the core comprises a first polymer and the sheath comprises a second polymer, wherein the first polymer and the second polymer are different (e.g., the first polymer and the second polymer have different melting temperatures). Bicomponent fibers are commonly used to produce nonwovens by air-laying techniques.

The presently disclosed subject matter contemplates the use of synthetic fibers, such as high-core bicomponent fibers. Bicomponent fibers having a core and a sheath are known in the art, but the present disclosure may utilize bicomponent fibers having a high core to sheath ratio in excess of 1:1, i.e., high core bicomponent fibers comprise greater than 50% by weight of the core. Without being bound by a particular theory, it is believed that the high-core bicomponent fibers may impart improved physical integrity, elasticity, and resistance to mechanical compression and/or tension to the nonwoven material. For example, high-core bicomponent fibers may impart these improved properties due to the increased volume of the core relative to the sheath.

As embodied herein, the high-core bicomponent fiber may have a polyethylene sheath. The core of the high-core bicomponent fiber can be made of a polymer having a melting point greater than about 200 ℃ and a density higher than the polyethylene sheath. For example, but not limited to, suitable core polymers include high melting point polyesters such as poly (ethylene terephthalate) (PET) and polypropylene (PP). The core to sheath ratio of the high-core bicomponent fiber can range from about 1:1 to about 2.5:1 or about 1:1 to about 7:3 or about 1.5:1 to about 7: 3.

In certain embodiments, the high-core bicomponent fiber may have a PET core and a polyethylene sheath in an off-center configuration, wherein the PET core comprises more than about 50% and not more than about 70% by weight of the fiber. For example, but not limited to, the PET core may comprise from about 60% to about 70% by weight of the fibers, and preferably comprises about 70% by weight of the fibers. In an alternative embodiment, the high-core bicomponent fiber may comprise a polypropylene core and a polyethylene sheath. In particular embodiments, such high-core bicomponent fibers may have a linear density of about 1.7 dtex and a cut length of about 6mm, although those skilled in the art will appreciate that bicomponent fibers may be formed having other thicknesses and cut lengths. For example, but not limited to, the high-core bicomponent fibers may have a linear density of about 1.3 to about 6.7 dtex, or about 1.7 to about 3.3 dtex. Additionally or alternatively, the high-core bicomponent fiber may have a cut length of about 4mm to about 8 mm.

In addition to the high-core bicomponent fibers, the nonwoven material can include any suitable additional bicomponent fibers, as known in the art. The additional bicomponent fibers may be conventional commercially available fibers or may be low-core bicomponent fibers having a core to sheath ratio of less than 1:1, i.e., the low-core bicomponent fibers comprise less than 50% by weight of the core. For example, a suitable low-core bicomponent fiber may comprise a PET core and a polyethylene sheath in an off-center configuration, and the PET core may comprise at least about 30% and less than about 50% by weight of the fiber, preferably from about 30% to about 40% by weight of the fiber, and more preferably about 30% by weight of the fiber. In certain embodiments, the low-core bicomponent fibers may impart improved strength to the nonwoven material, for example, increased fiber-to-fiber bonding due to the high volume of the sheath relative to the core. The low-core bicomponent fiber may have a 1:1 core to sheath ratio, i.e., the low-core bicomponent fiber comprises 50% by weight of the core.

However, many other types of bicomponent fibers are also used in the manufacture of nonwovens, particularly those produced for airlaid techniques, and are suitable for use in the presently disclosed nonwovens. Various bicomponent fibers suitable for use in the presently disclosed subject matter are disclosed in U.S. patent nos. 5,372,885 and 5,456,982, both of which are hereby incorporated by reference in their entirety. Examples of bicomponent Fiber manufacturers include, but are not limited to, Trevira (Bobingen, Germany), Fiber Innovation Technologies (Johnson City, TN), and ES Fiber Vision (Athens, GA).

Additional bicomponent fibers may also incorporate a variety of polymers as their core and sheath components. Bicomponent fibers with a PE (polyethylene) or modified PE sheath typically have a PET (polyethylene terephthalate) or PP (polypropylene) core. In one embodiment, the bicomponent fiber has a core made of polypropylene and a sheath made of polyethylene. Alternatively or additionally, the bicomponent fiber may have a core made of polyester (e.g., PET) and a sheath made of polyethylene.

As embodied herein, the bicomponent fibers may be low staple fibers having a linear density of from about 1.0 dtex to about 15.0 dtex, or from about 1.0 dtex to about 10.0 dtex, and more preferably no more than about 5.7 dtex. For example, the linear density of the bicomponent fibers may be about 1.7 dtex, about 2.0 dtex, about 2.2 dtex, about 3.0 dtex, about 3.3 dtex, about 5.0 dtex, or about 5.7 dtex. The bicomponent fibers may have a length of from about 2mm to about 36mm, preferably from about 3mm to about 12mm, more preferably from about 3mm to about 10mm, even more preferably from about 4mm to about 8 mm. In particular embodiments, the bicomponent fibers have a length of from about 4mm to about 6mm, or about 4mm, or about 6 mm.

Bicomponent fibers are typically manufactured commercially by melt spinning. In this process, each molten polymer is extruded through a die (e.g., a spinneret) and then pulled to move it away from the face of the spinneret. This is followed by solidification of the polymer by heat transfer to the surrounding fluid medium (e.g. cold air) and absorption of the now solid filaments. Non-limiting examples of additional steps after melt spinning may also include hot or cold drawing, heat treating, crimping, and cutting. The overall manufacturing process is typically carried out as a discontinuous two-step process that first involves spinning the filaments and collecting them into a tow comprising a plurality of filaments. During the spinning step, some drawing of the filaments does occur as the molten polymer is drawn away from the face of the spinneret, which may also be referred to as drawing. This is followed by a second step in which the spun fiber is drawn or stretched to increase molecular alignment and crystallinity, and to provide enhanced strength and other physical properties to the individual filaments. Subsequent steps may include, but are not limited to, heat setting, crimping, and cutting the filaments into fibers. The drawing or stretching step may involve drawing the core of the bicomponent fiber, the sheath of the bicomponent fiber, or both the core and the sheath of the bicomponent fiber, depending on the materials comprising the core and the sheath and the conditions employed during the drawing or stretching process.

Bicomponent fibers can also be formed in a continuous process, wherein spinning and drawing are accomplished in a continuous process. During the fiber manufacturing process, it is desirable to add various materials to the fibers after the melt spinning step at various subsequent steps in the process. These materials may be referred to as "finishes" and are composed of active agents such as, but not limited to, lubricants and antistatic agents. The finish is typically delivered via an aqueous-based solution or emulsion. The finish can provide desirable characteristics to both the manufacture of the bicomponent fiber and the user of the fiber, such as in an air-laid or wet-laid process.

Many other processes involve before, during, and after the spinning and drawing steps, and are disclosed in U.S. Pat. nos. 4,950,541, 5,082,899, 5,126,199, 5,372,885, 5,456,982, 5,705,565, 2,861,319, 2,931,091, 2,989,798, 3,038,235, 3,081,490, 3,117,362, 3,121,254, 3,188,689, 3,237,245, 3,249,669, 3,457,342, 3,466,703, 3,469,279, 3,500,498, 3,585,685, 3,163,170, 3,692,423, 3,716,317, 3,778,208, 3,787,162, 3,814,561, 3,963,406, 3,992,499, 4,052,146, 4,251,200, 4,350,006, 4,370,114, 4,406,850, 4,445,833, 4,717,325, 4,743,189, 5,162,074, 5,256,050, 5,505,889, 5,582,913, and 6,670,035, all of which are hereby incorporated by reference in their entirety.

The presently disclosed subject matter may also include, but is not limited to, articles comprising partially drawn bicomponent fibers, highly drawn bicomponent fibers, and mixtures thereof, at different degrees of drawing or stretching. These may include, but are not limited to, highly drawn polyester core bicomponent fibers with various sheath materials, particularly including polyethylene sheaths such as Trevira-255(Varde, Denmark), or highly drawn polypropylene core bicomponent fibers with various sheath materials, particularly including polyethylene sheaths such as ES fibers Vision AL-Adhesion-C (Varde, Denmark). Furthermore, Trevira T265 bicomponent fiber (Varde, Denmark) having a partially drawn core with a core made of polybutylene terephthalate (PBT) and a sheath made of polyethylene can also be used. The use of both partially drawn bicomponent fibers and highly drawn bicomponent fibers in the same structure can be used to meet specific physical and performance characteristics based on how they are incorporated into the structure.

The bicomponent fibers of the presently disclosed subject matter are not limited in scope to any particular polymer used for the core or sheath, as any partially drawn core bicomponent fiber can provide enhanced properties with respect to elongation and strength. The degree of draw of the partially drawn bicomponent fiber is not limited in scope, as different degrees of draw will produce different enhancements in properties. The scope of partially drawn bicomponent fibers encompasses fibers having various core-sheath configurations including, but not limited to, concentric, eccentric, side-by-side, islands-in-the-sea, pie segments, and other variations. The relative weight percentages of the core component and sheath component of the total fiber may vary. Further, the scope of the subject matter encompasses the use of partially drawn homopolymers such as polyesters, polypropylenes, nylons, and other melt-spinnable polymers. The scope of this subject matter also encompasses multicomponent fibers that can have more than two polymers as part of the fiber structure.

Cellulose fiber

Any cellulosic fiber known in the art, including cellulosic fibers of any natural origin, such as those derived from wood pulp or regenerated cellulose, may be used in the cellulosic fiber layer. In certain embodiments, cellulosic fibers include, but are not limited to, digestive fibers derived from softwood, hardwood, or cotton linters, such as kraft, prehydrolyzed kraft, soda, sulfite, chemical-thermal and thermo-mechanical treated fibers. In other embodiments, the cellulosic fibers include, but are not limited to, kraft digested fibers, including prehydrolyzed kraft digested fibers. In certain embodiments, the cellulosic fibers comprise bonded natural cellulosic fibers.

Non-limiting examples of cellulose fibers suitable for use in this subject matter are those derived from softwood (such as pine, fir, and spruce). Other suitable cellulosic fibers include, but are not limited to, those derived from esparto grass, bagasse, wool, flax, hemp, kenaf, and other sources of wood and cellulosic fibers. Suitable cellulosic fibers include, but are not limited to, FOLEY under the trademark FOLEYBleached kraft southern pine fiber (available from GP Cellulose) is sold.

The nonwoven material of the presently disclosed subject matter can also include, but is not limited to, commercially available bright fluff pulp, including, but not limited to, southern softwood kraft (such as Golden from GP Cellulose)4725) Or southern softwood fluff pulp (such as treated FOLEY from GP Cellulose)Or Golden4723) Northern softwood sulfite pulp (such as T730 from Weyerhaeuser) or hardwood pulp (such as eucalyptus). While certain pulps may be preferred based on a variety of factors, any cellulosic fluff pulp or mixtures thereof may be used. In certain embodiments, wood cellulose, cotton linter pulp, chemically modified cellulose such as cross-linked cellulose fibers, and highly purified cellulose fibers may be used. A non-limiting example of additional pulp is FOLEYFFTAS (also known AS FFTAS or GP Cellulose FFT-AS pulp) and Weyco CF 401.

In certain embodiments, fine fibers, such as certain softwood fibers, may be used. Some non-limiting examples of such fine fibers having Pulp fiber coarseness properties are provided in Table 1 with reference to Watson, P. et al, Canadian Pulp fiber Morphology: priority and consistency for End Use Potential, The forest Chonical, Vol.85, No. 3, p.401-.

Table 1: cork fiber

Substance(s)	Pulp fiber coarseness (mg/100m)
		Coastal douglas fir	24
All-grass of Western Hedychium	20
		Spruce/pine	18
Western red cedar	16
		Southern pine	30
Radiata pine	22
		Scandinavian pine	20
Black spruce	18

In certain embodiments, fine fibers, such as certain hardwood fibers, may be used. Certain non-limiting examples of such fine fibers having pulp fiber coarseness properties are provided in table 2, at least in part, with reference to the following documents: horn, R., Morphology of Pulp Fiber from Hardwoods and underfluence on Paper Strength, Research Paper FPL 312, Forest Products Laboratory, U.S. department of Agriculture (1978) and Bleached Eucalyptus Kraft Paper ECF Technical Sheet (2017, month 4) (see https:// www.metsafibre.com/en/Documents/Data-sheets/Cenibra-euca-Eucalyptus. pdf).

Table 2: hardwood fibers

Substance(s)	Pulp fiber coarseness (mg/100m)
		Red alder	12.38
Aspen	8.59
		American elm	9.53
Betula papyrifera	13.08
		American beech	13.10
Small brown hickory	10.59
		Sweet maple	7.86
White oak	14.08
		Eucalyptus	6.5+/-2.3

In certain embodiments, the cellulosic fibers may have a Kajaani weighted average length of about 1.5mm or less, about 1.4mm or less, about 1.3mm or less, about 1.2mm or less, about 1.1mm or less, or about 1.0mm or less. In certain embodiments, the cellulosic fibers may have a weighted average length of Kajaani between about 0.1mm and about 1.5mm, between about 0.5mm and about 1.5mm, or between about 1mm and about 1.5 mm. In particular embodiments, the cellulosic fibers may have a Kajaani weighted average length of about 0.1mm, about 0.5mm, about 1mm, about 1.1mm, about 1.2mm, about 1.3mm, about 1.4mm, or about 1.5 mm.

In certain embodiments, the cellulosic fibers may have a thickness of less than about 15mg/100m, about 12mg/100m, about 10mg/100m, or about 5mg/100 m. In certain embodiments, the cellulosic fibers can have a thickness of between about 1mg/100m and about 15mg/100m, about 5mg/100m and about 10mg/100m, about 6mg/100m and about 10mg/100m, or about 4.2mg/100m and about 8.8mg/100 m. In particular embodiments, the thickness of the cellulose fibers may be about 1mg/100m, about 2mg/100m, about 4.2mg/100m, about 6.5mg/100m, about 7mg/100m, about 8.8mg/100m, about 10mg/100m, about 12mg/100m, or about 15mg/100 m.

In certain embodiments, the cellulosic fibers may have a weighted average Kajaani length of about 1.5mm or less and a coarseness of less than about 15mg/100 m. In certain embodiments, the cellulosic fibers may have a weighted average length of Kajaani of about 1.5mm or less and a coarseness of less than about 10mg/100 m. In particular embodiments, the cellulosic fibers may include bonded hardwood natural cellulosic fibers having a Kajaani weighted average length of about 1.5mm or less and a coarseness of less than about 15mg/100 m. In particular embodiments, the cellulosic fibers may include bonded hardwood natural cellulosic fibers having a Kajaani weighted average length of about 1.5mm or less and a coarseness of less than about 10mg/100 m. Structures having fibers with these parameters (e.g., hardwood fibers) allow for high capillary action while liquid slowly migrates through the structure.

Binder

In certain non-limiting embodiments, the nonwoven materials described herein can include a binder. Suitable binders include, but are not limited to, liquid binders and powder binders. Non-limiting examples of liquid binders include emulsions, solutions or suspensions of the binder. Non-limiting examples of binders include polyethylene powder, copolymer binders, vinyl acetate ethylene binders, styrene-butadiene binders, urethanes, urethane-based binders, acrylic binders, thermoplastic binders, natural polymer-based binders, and mixtures thereof.

Suitable binders include, but are not limited to: copolymers, including vinyl chloride-containing copolymers such as Wacker Vinnol 4500, Vinnol 4514 and Vinnol 4530, vinyl acetate ethylene ("VAE") copolymers which may have stabilizers such as Wacker Vinnapas 192, Wacker Vinnapas EF 539, Wacker Vinnapas EP907, Wacker Vinnapas EP129, Celanese Durofet E130, Celanese Dur-O-Set Elite 13025-, Styrene-butadiene, urethane based binders, thermoplastic binders, acrylic binders, and carboxymethyl cellulose such as Hercules Aqualon CMC. In certain embodiments, the binder is a natural polymer-based binder. Non-limiting examples of natural polymer-based binders include polymers derived from starch, cellulose, chitin, and other polysaccharides.

In certain embodiments, the binder is water soluble. In one embodiment, the binder is a vinyl acetate ethylene copolymer. One non-limiting example of such a copolymer is EP907(Wacker Chemicals, Munich, Germany). Vinnapas EP907, which may be applied at a level of about 10% solids, incorporates about 0.75% by weight of Aerosol OT (Cytec Industries, West Paterson, n.j.), which is an anionic surfactant. Other types of liquid binders, such as styrene-butadiene and acrylic binders, may also be used.

In certain embodiments, the binder is not water soluble. Examples of such binders include, but are not limited to, Vinnapas 124 and 192(Wacker), which may have opacifiers and brighteners dispersed in an emulsion, including, but not limited to, titanium dioxide. Other binders include, but are not limited to, Celanese Emulsions (Bridgewater, N.J.) Elite 22 and Elite 33.

In certain embodiments, the binder is a thermoplastic binder. Such thermoplastic binders include, but are not limited to, any thermoplastic polymer that can melt at temperatures that do not substantially damage the cellulose fibers. Preferably, the melting point of the thermoplastic bonding material will be less than about 175 ℃. Examples of suitable thermoplastic materials include, but are not limited to, thermoplastic binders and suspensions of thermoplastic powders. In particular embodiments, the thermoplastic bonding material may be, for example, polyethylene, polypropylene, polyvinyl chloride, and/or polyvinylidene chloride.

The binder may be non-crosslinkable orIs crosslinkable. In certain embodiments, the binder is a WD4047 urethane-based binder solution supplied by HB Fuller. In one embodiment, the binder is a Michem Prime 4983-45N dispersion of ethylene acrylic acid ("EAA") copolymer supplied by Michelman. In certain embodiments, the binder is a Dur-O-Set Elite 22LV emulsion of VAE binder supplied by Celanese Emulsions (Bridgewater, n.j.). As noted above, in certain embodiments, the binder is crosslinkable. It should also be understood that the crosslinkable binder is also referred to as a permanent wet strength binder. Permanent wet strength adhesives include, but are not limited to(Hercules Inc.,Wilmington,Del)、(American Cyanamid Company, Wayne, N.J.), Wacker Vinnapas or AF192(Wacker Chemie AG, Munich, Germany), etc. Various permanent wet strength agents are described in U.S. Pat. No. 2,345,543, U.S. Pat. No. 2,926,116, and U.S. Pat. No. 2,926,154, the disclosures of which are incorporated by reference in their entirety. Other permanent wet strength binders include, but are not limited to, polyamine-epichlorohydrin, polyamide epichlorohydrin, or polyamide-amine epichlorohydrin resins, which are collectively referred to as "PAE resins". Non-limiting exemplary permanent wet strength binders include Kymene 557H or Kymene 557LX (Hercules inc., Wilmington, Del.) and are described in U.S. Pat. No. 3,700,623 and U.S. Pat. No. 3,772,076, which are incorporated herein by reference in their entirety.

Alternatively, in certain embodiments, the binder is a temporary wet strength binder. Temporary wet strength adhesives include, but are not limited to(Hercules Inc.,Wilmington,Del.)、750(American Cyanamid Company,Wayne,N.J.)、745(American Cyanamid Company, Wayne, N.J.), etc. Other suitable temporary wet strength binders include, but are not limited to, dialdehyde starch, polyethyleneimine, mannogalactan gum, glyoxal, and dialdehyde mannogalactan. Other suitable temporary wet strength agents are described in U.S. Pat. No. 3,556,932, U.S. Pat. No. 5,466,337, U.S. Pat. No. 3,556,933, U.S. Pat. No. 4,605,702, U.S. Pat. No. 4,603,176, U.S. Pat. No. 5,935,383, and U.S. Pat. No. 6,017,417, all of which are incorporated herein by reference in their entirety.

In certain embodiments, the binder is applied as an emulsion in an amount ranging from about 1gsm to about 15gsm, or from about 2gsm to about 10gsm, or from about 3gsm to about 8 gsm. The emulsion may further comprise one or more additional components. For example, but not limited to, the emulsion may comprise one or more surfactants in an amount of from about 0.5% to about 1.5% by weight, or from about 0.5% to about 1% by weight, based on the total weight of the emulsion. In certain non-limiting embodiments, the emulsion may comprise one or more surfactants in an amount of about 0.75% by weight, based on the total weight of the emulsion. The binder, whether or not part of the emulsion, may be applied to one side of the fibrous layer, preferably the outward facing layer. Alternatively, the adhesive may be applied to both sides of the layer in equal or disproportionate amounts.

Other additives

The materials of the presently disclosed subject matter may also include other additives. For example, these materials may comprise superabsorbent polymers (SAP). Types of superabsorbent polymers useful in the presently disclosed subject matter include, but are not limited to, SAP in particulate form, such as powders, irregular particles, spherical particles, staple fibers, and other elongated particles. U.S. patent nos. 5,147,343; 5,378,528, respectively; 5,795,439, respectively; 5,807,916, respectively; 5,849,211, respectively; and 6,403,857, which are hereby incorporated by reference in their entirety, describe various superabsorbent polymers and methods of making superabsorbent polymers. One example of a system for forming superabsorbent polymers is a crosslinked acrylic acid copolymer of a metal salt of acrylic acid and acrylamide or other monomers such as 2-acrylamido-2-methylpropanesulfonic acid. Many conventional particulate superabsorbent polymers are based on poly (acrylic acid) which has been crosslinked during polymerization with any of a number of polyfunctional comonomer crosslinking agents well known in the art. Examples of multifunctional crosslinking agents are set forth below: U.S. Pat. nos. 2,929,154, 3,224,986; 3,332,909, respectively; and 4,076,673, which are incorporated herein by reference in their entirety. For example, crosslinked carboxylated polyelectrolytes may be used to form superabsorbent polymers. Other water-soluble polyelectrolyte polymers are known to be useful in the preparation of superabsorbents by crosslinking, including: carboxymethyl starch, carboxymethyl cellulose, chitosan salt, gelatin salt, etc. However, they cannot generally be used on a commercial scale to enhance the absorbency of dispensable absorbent articles, primarily due to their relatively high cost. Superabsorbent polymer particles useful in practicing the present subject matter are commercially available from a variety of manufacturers, such as BASF, Dow Chemical (Midland, Mich.), Stockhausen (Greensboro, N.C.), Chemdal (Arlington Heights, Ill.), and Evonik (Essen, Germany). Non-limiting examples of SAPs include surface cross-linked acrylic acid based powders such as Stockhausen 9350 or SX70, BASF HySorb FEM33N, or Evonik Favor SXM 7900.

In certain embodiments, the SAP may be used in the layer in an amount ranging from about 5 wt% to about 100 wt%, based on the total weight of the structure. In particular embodiments, a layer comprising 100% by weight SAP may be disposed between two adjacent layers comprising fibers. In certain embodiments, the amount of SAP in a layer may range from about 10gsm to about 60gsm, or from about 20gsm to about 50gsm, or from about 30gsm to about 40 gsm. In particular embodiments, the amount of SAP in a layer may be about 10gsm, about 20gsm, about 30gsm, about 40gsm, about 50gsm, or about 60 gsm.

Nonwoven material

The presently disclosed subject matter provides nonwoven materials incorporating cellulosic fibers. The nonwoven material may also include synthetic fibers. As embodied herein, the nonwoven material may comprise at least one layer, at least two layers, or at least three layers. In certain non-limiting embodiments, the nonwoven material comprises more than three layers. In certain non-limiting embodiments, the nonwoven material comprises at least one layer.

As embodied herein, the nonwoven material may be an airlaid material. For example, but not limited to, the material may be a Thermally Bonded Airlaid (TBAL) material comprising cellulose fibers. In certain non-limiting embodiments, the material can be a multi-bond airlaid (MBAL) material comprising cellulose fibers. The material may also include a binder.

In certain non-limiting embodiments, the nonwoven material can comprise a single layer comprising cellulosic fibers. For example, but not limited to, the monolayer may comprise cellulosic fibers in an amount of about 75% to about 90% by weight. In certain non-limiting embodiments, the monolayer may comprise from about 75% to about 85%, from about 75% to about 80%, from about 80% to about 90%, from about 85% to about 90%, by weight, of cellulosic fibers. In certain non-limiting embodiments, the monolayer may comprise about 75%, about 77%, about 80%, about 82%, about 85%, or about 90% by weight of the cellulosic fibers. The cellulosic fibers may include eucalyptus pulp. The single layer may also include additional fiber types. The single layer may also include synthetic fibers. For example, but not limiting of, the monolayer may comprise synthetic fibers in an amount of about 10 wt% to about 20 wt%. In certain non-limiting embodiments, the monolayer may comprise from about 10% to about 15% or from about 15% to about 20% by weight of the synthetic fibers. In certain non-limiting embodiments, the monolayer comprises about 10 wt%, about 12 wt%, about 15 wt%, about 18 wt%, or about 20 wt% synthetic fibers. The synthetic fibers may include bicomponent binder fibers, eccentric bicomponent binder fibers, or combinations thereof. In certain non-limiting embodiments, the single layer may comprise from about 10% to about 25% by weight of synthetic fibers and from about 75% to about 90% by weight of cellulosic fibers. In certain non-limiting embodiments, the single layer may comprise from about 15% to about 20% by weight of synthetic fibers and from about 80% to about 85% by weight of cellulosic fibers. In certain other non-limiting embodiments, the monolayer may comprise about 82% by weight cellulose and about 18% by weight synthetic fibers. In certain non-limiting embodiments, the single layer nonwoven material may also include, for example, superabsorbent polymers (SAP) to increase liquid capacity and slow the release of absorbed liquid. Thus, a metered release of the liquid is provided.

In certain non-limiting embodiments, the nonwoven material can comprise at least two layers. In certain non-limiting embodiments, two layers may be adjacent to each other. The two layers may have the same or different compositions from each other. In certain non-limiting embodiments, at least one layer may comprise cellulosic fibers and synthetic fibers. For example, but not limited to, at least one layer may comprise cellulosic fibers in an amount of about 75 wt.% to about 90 wt.%. In certain non-limiting embodiments, at least one layer may comprise from about 75% to about 85%, from about 75% to about 80%, from about 80% to about 90%, from about 85% to about 90%, by weight, of cellulosic fibers. In certain non-limiting embodiments, at least one layer may comprise about 75 wt%, about 77 wt%, about 80 wt%, about 82 wt%, about 85 wt%, or about 90 wt% cellulosic fibers. The cellulosic fibers may include eucalyptus pulp. For example, but not limiting of, at least one layer may also comprise synthetic fibers in an amount of about 10% to about 20% by weight. In certain non-limiting embodiments, the monolayer may comprise from about 10% to about 15% or from about 15% to about 20% by weight of the synthetic fibers. In certain non-limiting embodiments, at least one layer comprises about 10 wt%, about 12 wt%, about 15 wt%, about 18 wt%, or about 20 wt% synthetic fibers. The synthetic fibers may include bicomponent binder fibers, eccentric bicomponent binder fibers, or combinations thereof. In certain non-limiting embodiments, at least one layer may comprise from about 10% to about 25% by weight synthetic fibers and from about 75% to about 90% by weight cellulosic fibers. In certain non-limiting embodiments, at least one layer may comprise from about 15% to about 20% by weight synthetic fibers and from about 80% to about 85% by weight cellulosic fibers. In certain non-limiting embodiments, at least one layer may comprise about 82 weight percent cellulosic fibers and about 18 weight percent synthetic fibers. In certain non-limiting embodiments, at least one layer may comprise bicomponent binder fibers or eccentric bicomponent binder fibers. For example, in certain non-limiting embodiments, a nonwoven material comprising at least two layers may comprise a layer comprising synthetic fibers in addition to at least one layer comprising cellulosic fibers and synthetic fibers. For example, a layer comprising synthetic fibers may comprise about 100% synthetic fibers by weight. In certain non-limiting embodiments, a nonwoven material having at least two layers may include a layer having cellulosic fibers and synthetic fibers and a layer having synthetic fibers. For example, a nonwoven material having at least two layers may include one layer having cellulosic fibers and synthetic fibers and one layer having only synthetic fibers. Additionally, the adhesive may be applied to a surface of the structure, such as a bottom surface of the structure. In certain non-limiting embodiments, the bi-layer nonwoven may also include, for example, superabsorbent polymers (SAP) to increase liquid capacity and slow the release of absorbed liquid.

In certain non-limiting embodiments, the nonwoven material can comprise at least three layers. In certain non-limiting embodiments, at least three layers may be disposed adjacent to each other. The at least three layers may each have the same or different composition from each other. In certain non-limiting embodiments, each of the layers may include cellulosic fibers and bicomponent synthetic fibers. For example, but not limiting of, one or more layers may comprise cellulosic fibers in an amount of about 75% to about 90% by weight. In certain non-limiting embodiments, one or more layers may comprise from about 75% to about 85%, from about 75% to about 80%, from about 80% to about 90%, from about 85% to about 90%, by weight, of cellulosic fibers. In certain non-limiting embodiments, one or more layers may comprise about 75 wt%, about 77 wt%, about 80 wt%, about 82 wt%, about 85 wt%, or about 90 wt% cellulosic fibers. The cellulosic fibers may include eucalyptus pulp. For example, but not limiting of, one or more layers may comprise synthetic fibers in an amount of about 10 wt% to about 20 wt%. In certain non-limiting embodiments, one or more layers may comprise from about 10% to about 15% or from about 15% to about 20% by weight of synthetic fibers. In certain non-limiting embodiments, one or more layers may comprise about 10 wt%, about 12 wt%, about 15 wt%, about 18 wt%, or about 20 wt% synthetic fibers. The synthetic fibers may include bicomponent binder fibers, eccentric bicomponent binder fibers, or combinations thereof. In certain non-limiting embodiments, one or more layers may comprise from about 10% to about 25% by weight synthetic fibers and from about 75% to about 90% by weight cellulosic fibers. In certain non-limiting embodiments, one or more layers may comprise from about 15% to about 20% by weight synthetic fibers and from about 80% to about 85% by weight cellulosic fibers. In certain non-limiting embodiments, one or more layers may comprise about 82 weight percent cellulosic fibers and about 18 weight percent synthetic fibers.

In certain non-limiting embodiments, the nonwoven material may comprise at least three layers having at least two layers comprising cellulosic fibers and bicomponent synthetic fibers and at least one layer comprising synthetic fibers. For example, at least one layer comprising synthetic fibers may comprise about 100% by weight of synthetic fibers. In certain non-limiting embodiments, a nonwoven material having at least three layers may include two layers having cellulosic fibers and synthetic fibers and a layer having synthetic fibers. For example, a nonwoven material having at least three layers may include two layers having cellulosic fibers and synthetic fibers and one layer having only synthetic fibers. Additionally, the at least two layers comprising cellulosic fibers may comprise eucalyptus pulp. The at least three layers comprising synthetic fibers may comprise bicomponent binder fibers, eccentric bicomponent binder fibers, or a combination thereof. In certain non-limiting embodiments, the at least two layers may each comprise from about 10% to about 25% by weight of synthetic fibers and from about 75% to about 90% by weight of cellulosic fibers. In certain non-limiting embodiments, the at least two layers may comprise from about 15% to about 20% by weight of synthetic fibers and from about 80% to about 85% by weight of cellulosic fibers. In certain non-limiting embodiments, the at least two layers may comprise about 82 weight percent cellulosic fibers and about 18 weight percent synthetic fibers. Additionally, the adhesive may be applied to a surface of the structure, such as a bottom surface of the structure. In certain non-limiting embodiments, the three-layer nonwoven material may also include, for example, superabsorbent polymers (SAP) to increase liquid capacity and slow the release of absorbed liquid. In certain non-limiting embodiments, a tacky adhesive can be disposed on at least a portion of the structure. For example, from about 0gsm to about 6gsm of tacky adhesive may be added to the structure. In certain non-limiting embodiments, the structure may comprise a tacky gsm adhesive in an amount of from about 0gsm to about 6gsm, from about 0gsm to about 5gsm, from about 0gsm to about 4gsm, from about 0gsm to about 3gsm, from about 0gsm to about 2gsm, from about 1gsm to about 6gsm, from about 1gsm to about 5gsm, from about 1gsm to about 4gsm, from about 1gsm to about 3gsm, from about 1gsm to about 2gsm, from about 2gsm to about 6gsm, from about 2gsm to about 5gsm, from about 2gsm to about 4gsm, from about 2gsm to about 3gsm, from about 3gsm to about 6gsm, from about 3gsm to about 5gsm, from about 3gsm to about 4gsm, from about 4gsm to about 6gsm, from about 4gsm to about 5gsm, or from about 5gsm to about 6 gsm. In certain non-limiting embodiments, the structure may comprise a tacky adhesive in an amount of about 1gsm, about 2gsm, about 3gsm, about 4gsm, about 5gsm, or about 6 gsm.

Additionally or alternatively, the structure may be coated on at least a portion of its outer surface with an adhesive. The binder need not be chemically bonded to a portion of the layer, but preferably the binder remains associated with the layer in close proximity by coating, adhesion, precipitation, or any other mechanism so that it does not separate from the layer during normal handling of the layer. For convenience, the association between the layer and the binder discussed above may be referred to as bonding, and the compound may be referred to as bonding to the layer. If present, the binder may be applied in an amount in the range of about 1gsm to about 15gsm, or about 2gsm to about 10gsm, or about 2gsm to about 8gsm, or about 3gsm to about 5 gsm.

In general, the first layer may have a basis weight of from about 20gsm to about 130gsm, or from about 35gsm to about 100gsm, or from about 40gsm to about 80gsm, or from about 45gsm to about 60 gsm. When the first layer comprises a blend of cellulosic fibers and synthetic fibers, the cellulosic fibers can be present in an amount of about 10% to about 25% by weight of the synthetic fibers and about 75% to about 90% by weight of the cellulosic fibers, or about 15% to about 20% by weight of the synthetic fibers and about 80% to about 85% by weight of the cellulosic fibers, or about 82% by weight of the cellulosic fibers and about 18% by weight of the synthetic fibers. Alternatively, the first layer may comprise synthetic fibers. For example, the first layer may comprise about 100% by weight of the synthetic fibers.

In these embodiments, the second layer comprising cellulosic fibers and synthetic fibers may have a basis weight of from about 35gsm to about 110gsm, from about 40gsm to about 105gsm, from about 45gsm to about 85gsm, or from about 50gsm to about 75 gsm. When the second layer comprises a blend of cellulosic fibers and synthetic fibers, the cellulosic fibers can be present in an amount of about 10 to about 25 weight percent synthetic fibers and about 75 to about 90 weight percent cellulosic fibers, or about 15 to about 20 weight percent synthetic fibers and about 80 to about 85 weight percent cellulosic fibers, or about 82 weight percent cellulosic fibers and about 18 weight percent synthetic fibers.

The material may optionally include a third layer comprising cellulose fibers and synthetic fibers disposed between the first layer and the second layer, the third layer may have a basis weight of from about 30gsm to about 140gsm, or from about 35gsm to about 130gsm, or from about 40gsm to about 100gsm, or from about 45gsm to about 75 gsm. When the third layer comprises a blend of cellulosic fibers and synthetic fibers, the cellulosic fibers can be present in an amount of about 10% to about 25% by weight of the synthetic fibers and about 75% to about 90% by weight of the cellulosic fibers, or about 15% to about 20% by weight of the synthetic fibers and about 80% to about 85% by weight of the cellulosic fibers, or about 82% by weight of the cellulosic fibers and about 18% by weight of the synthetic fibers.

Method for producing nonwoven material

Various methods may be used to assemble materials used in the practice of the presently disclosed subject matter to produce the materials, including, but not limited to, conventional dry forming methods such as air laying and carding or other forming techniques such as hydroentangling or air blowing. Preferably, the material may be prepared by an air-laying process. Airlaid processes include, but are not limited to, the use of one or more forming heads to deposit raw materials having different compositions in a selected order during the manufacturing process to produce products having different layers. This allows great flexibility in the variety of products that can be produced.

In one embodiment, the material is prepared as a continuous air-laid web. Airlaid webs are typically prepared by disintegrating or defibering one or more sheets of cellulosic pulp, typically by a hammermill, to provide individual fibers. The hammer mill or other comminutor may be fed with recycled air-laid edge trim and off-spec transition material generated during grade changes and other air-laid production waste, rather than pulp sheets of virgin fibers. Being able to recover production waste therefrom will contribute to improving the economics of the overall process. The individual fiber air from any source (virgin or recycled) is then delivered to the forming head on an air-laid web forming machine. Many manufacturers make air-laid Web Forming machines suitable for use in the presently disclosed subject matter, including Dan-Web Forming, Aarhus, Denmark, M & J Fibretech A/S, Horsens, Denmark, random Machine Corporation, Macedon, N.Y., Margasa Textile Machine, Cerdanyola del Valles, Spain, and DOA International, Wels, Austria, described in U.S. Pat. No. 3,972,092. While these many forming machines differ in how the fibers are opened and air fed to the forming wire, they are capable of producing the web of the presently disclosed subject matter. The Dan-Web forming head includes rotating or agitated perforated cylinders that are used to keep the fibers separated until the fibers are vacuum pulled onto a foraminous forming conveyor or forming wire. In M & J machines, the forming head is essentially a rotary agitator above the screen. The rotary agitator may comprise a series or string of rotating propellers or fan blades. Other fibers, such as synthetic thermoplastic fibers, are opened, weighed, and mixed in a fiber dosing system, such as a fabric feeder supplied by Laroche s.a., Cours-La Ville, France. From the fabric feeder, the fibers are air-conveyed to the forming head of the airlaid machine where they are further mixed with the comminuted cellulose pulp fibers from the hammermill and deposited onto a continuously moving forming web. Where a defined layer is required, a separate forming head may be used for each type of fibre. Alternatively or additionally, one or more layers may be preformed prior to combination with additional layers (if any). In certain embodiments, the forming wire may be patterned such that at least one layer of the resulting nonwoven material is patterned.

If desired, the air-laid web is transferred from the forming wire to a calendering or other compaction stage to compact the web, thereby increasing its strength and controlling web thickness. In one embodiment, the fibers of the web are then bonded by passing through an oven set at a temperature high enough to fuse the included thermoplastic or other binder material. In further embodiments, secondary bonding from drying or curing of the latex spray or foam application occurs in the same oven. The oven may be a conventional vented oven, operating as a convection oven, or the necessary heating may be achieved by infrared or even microwave radiation. In particular embodiments, the air-laid web may be treated with additional additives before or after heat curing. The air-laid web may optionally be embossed or otherwise patterned. The air-laid web may then be rolled into a bale on a roll.

Use and characteristics of nonwoven materials

The nonwoven material of the presently disclosed subject matter can be used in any application known in the art. The nonwoven material may be used alone or as a component in other consumer products. For example, the nonwoven material may be used alone or as a component in a variety of absorbent articles, including cleaning articles, personal care wipes, baby diapers, adult incontinence products, sanitary napkins, and the like. Absorbent cleaning products include wipes, sheets, towels, and the like. The absorbency of the nonwoven material can aid in soil and stain removal in such cleaning applications. In certain aspects, the layered structure of the disclosed nonwoven materials can provide a two-sided substrate suitable for use as a wipe, sheet, towel, or the like.

The use of cellulose fibers having a weighted average length of Kajaani of less than about 1.5mm and a thickness of less than about 15mg/100m and thus having a high capillarity allows the slow migration of liquids through the structure. In the dry state, the layer comprising cellulose fibres having the above parameters distributes the liquid over the entire structure and prevents the liquid from being released quickly due to high capillary action. Thus, the nonwoven materials described herein can be used as a high absorbency material for cleaning liquids.

In certain aspects, the present disclosure relates to nonwoven materials having improved performance as cleaning devices. The nonwoven materials described herein may also be used in pre-moistened cleaning materials. Because the nonwovens described herein have high capillary action that allows for metered release of absorbed liquids, a single pre-moistened wipe comprising these nonwovens can be used to clean a large surface area.

Furthermore, the material may be designed such that the outer layer contacting the surface to be cleaned may comprise bonded synthetic fibres. The bonded synthetic fibers may provide increased article pickup and allow the outer surface to provide a scrubbing surface.

In certain non-limiting embodiments, the nonwoven material is a multi-layer unitary absorbent material, each layer of which has particular characteristics and is the medium by which a typical cleaning formulation (e.g., a liquid or lotion) for cleaning hard surfaces can be metered onto or absorbed from the surface to be cleaned.

In certain non-limiting embodiments, the layer adjacent the floor side contains eucalyptus fibers that aid in the release and distribution of the liquid, while the other layers are used to store the liquid. In certain non-limiting embodiments, the middle layer disposed between the first and second outer layers comprises eucalyptus fibers and provides a metered release of the liquid.

As noted above, in certain non-limiting embodiments, the nonwoven materials of the present disclosure can be used in conjunction with a variety of cleaning formulations (e.g., liquids or lotions) known in the art. Such cleaning formulations may be in the form of solutions or emulsions. In certain embodiments, the cleaning formulation is water-based. In certain non-limiting embodiments, the cleaning formulation is non-aqueous based.

6. Examples of the embodiments

The following examples are merely illustrative of the presently disclosed subject matter and they should not be considered as limiting the scope of the presently disclosed subject matter in any way.

Example 1: multilayer unitary absorbent nonwoven material for liquid retention and metered liquid release

The present embodiments provide a multilayer nonwoven substrate that can retain a liquid and provide metered release of the liquid. Different compositions were prepared and tested as follows. In this example, a nonwoven substrate having multiple layers was formed and tested for liquid retention. The control sample and samples 1 to 3 were cut into samples measuring 10 inches by 4 inches. (10 inches in the machine direction). The sample was centered on a 50gsm hydroentangling (10 inch by 8.5 inch dimension) web. A 45gsm spunlace (cover fabric) (10 inch x 5 inch dimensions) was placed on the substrate. The layers of the sample were stamped together using a stamping plate and Carver press. The samples were then weighed.

The compositions of the control sample and samples 1 to 3 are shown in tables 3 to 6 below.

Table 3: control sample composition

Control samples were prepared and tested for comparison purposes. The control sample was constructed from three uniform layers each comprising cellulose and synthetic fibers. The substrate was a 125gsm thermally bonded Dan-Web airlaid nonwoven (TBAL) product with 18 wt% bicomponent synthetic fibers. The control sample included three homogeneous layers. Each layer comprised 34.16gsm cellulose (GP 4725, semi-processed pulp made from Georgia-Pacific) blended with 7.5gsm synthetic fiber (Trevira 257 type-1.7 dtex, 6 mm). The total weight of the structure was calculated to be 125.0 gsm.

Table 4: sample 1 composition

Sample 1 was constructed from three uniform layers each comprising cellulose and synthetic fibers. The substrate was a 125gsm thermally bonded Dan-Web airlaid nonwoven (TBAL) product with 18 wt% bicomponent synthetic fibers. Sample 1 included three layers. The bottom layer comprises 40% of the overall structure. The bottom layer comprised 41gsm cellulose (GP 4725, semi-treated pulp made from Georgia-Pacific) and 9gsm synthetic fibers (Trevira type 255-2.2 dtex, 6 mm). The top and middle layers each contained 30.75gsm cellulose (GP 4725, semi-treated pulp made from Georgia-Pacific) and 6.75gsm synthetic fibers (Trevira type 255-2.2 dtex, 6 mm). The total weight of the structure was calculated to be 125.0 gsm.

Table 5: sample 2 composition

Sample 2 was constructed from three uniform layers each comprising cellulose and synthetic fibers. The substrate was a 125gsm thermally bonded Dan-Web airlaid nonwoven (TBAL) product with 18 wt% bicomponent synthetic fibers. Sample 2 included three layers. The bottom layer comprises 40% of the overall structure. The bottom layer comprised 41gsm eucalyptus pulp (Suzano, untreated) and 9gsm synthetic fibers (Trevira type 255-2.2 dtex, 6 mm). The top and middle layers each contained 30.75gsm cellulose (GP 4725, semi-treated pulp made from Georgia-Pacific) and 6.75gsm synthetic fibers (Trevira type 255-2.2 dtex, 6 mm). The total weight of the structure was calculated to be 125.0 gsm.

Table 6: sample 3 composition

Sample 3 was constructed from three uniform layers each comprising cellulose and synthetic fibers. The substrate was a 130gsm thermally bonded Dan-Web airlaid nonwoven (TBAL) product with 18 wt% bicomponent synthetic fibers. Sample 3 included three layers. The top and bottom layers each contained 35.53gsm eucalyptus pulp (Suzano, untreated) and 7.8gsm synthetic fibers (Trevira type 255-1.5 dtex, 6 mm). The middle layer contained 35.53gsm cellulose (GP 4725, semi-treated pulp made from Georgia-Pacific) and 7.8gsm synthetic fibers (Trevira type 255-1.7 dtex, 6 mm). The total weight of the structure was calculated to be 130.0 gsm.

Example 2: use of eccentric bicomponent fibers with eucalyptus in the bottom or middle layer and on top Multilayer unitary absorbent structure for storing and metered release of liquids

Samples 4 and 5 were prepared and tested for liquid retention. Samples 4 and 5 are unitary absorbent composites consisting of three layers stacked on top of each other and designed to store liquid, provide metered release of liquid, and replace hydroentanglement used in commercially available disposable wet mops. An adhesive is applied to the bottom of the structure. The substrate was cut into approximately 10 inch x 9 inch samples (10 inches being the machine direction). Some of the 10 inch by 9 inch samples were not embossed and had a thickness of about 3.5 mm. Some of the 10 inch by 9 inch samples were embossed with a pattern to a thickness of about 2.25 mm. The compositions of samples 4 and 5 are shown in tables 7 and 8, respectively.

Table 7: sample 4 composition

Sample 4 was constructed from three uniform layers, two of which comprised cellulose and synthetic fibers and one of which comprised synthetic fibers. The substrate was a 200gsm, multi-bonded Dan-Web air-laid nonwoven (MBAL) product with 31.5% bicomponent synthetic fibers and 2.5% binder. Sample 4 included three layers. The bottom layer contained 62gsm eucalyptus pulp (Suzano, untreated) and 8gsm synthetic fibers (Trevira type 255-1.5 dtex, 6 mm). The middle layer contained 70gsm cellulose (GP 4723, fully treated pulp made from Georgia-Pacific) and 30gsm synthetic fibers (Trevira type 255-1.7 dtex, 6 mm). The top layer contained 25gsm eccentric bicomponent fibers (Trevira type 255-6.7 dtex, 5 mm). 5gsm of adhesive (Wacker Vinnapas 192) was applied to the bottom (floor cleaning tool side) of the structure. The total weight of the structure was calculated to be 200.0 gsm.

Table 8: sample 5 composition

Sample 5 was constructed from three uniform layers, two of which comprised cellulose and synthetic fibers and one of which comprised synthetic fibers. The substrate was a 200gsm, multi-bonded Dan-Web air-laid nonwoven (MBAL) product with 31.5% bicomponent synthetic fibers and 2.5% binder. Sample 5 included three layers. The bottom layer comprised 70gsm cellulose (GP 4723, fully treated pulp made by Georgia-Pacific) and 30gsm synthetic fibers (Trevira type 255-1.7 dtex, 6 mm). The middle layer contained 62gsm eucalyptus pulp (Suzano, untreated) and 8gsm synthetic fibers (Trevira type 255-1.5 dtex, 6 mm). The top layer contained 25gsm eccentric bicomponent fibers (Trevira type 255-6.7 dtex, 5 mm). 5gsm of adhesive (Wacker Vinnapas 192) was applied to the bottom (floor cleaning tool side) of the structure. The total weight of the structure was calculated to be 200.0 gsm.

Example 3: study of liquid Release

A study was conducted to quantitatively measure the release of liquid or lotion from a pre-moistened substrate to assess the amount released from the wipe during cleaning.

The control samples and samples 1-5 were tested on the apparatus shown in FIG. 1. Sample 4 and sample 5 were each subjected to both embossed and non-embossed tests. The apparatus includes a floor base jig that exhibits an oak hardwood floor covering measuring approximately 91.44cm (3 feet) by 91.44cm (3 feet) and surrounded on three sides of the perimeter by a wood baseplate 7.62cm (3 inches) high in front of the 25.40cm (10 inches) wall. To measure the release of liquid from each substrate, the substrate is cut to sample size, andthe lotion is added in an amount of about 6.5 to about 7 times the weight of the substrate. Lotion-containing wet mop wipes that have been premoistened: (Great Value wet mop wipe). The lotion was poured onto the sample using a beaker and a 526 gram steel roller was rolled across the sample to evenly distribute the lotion throughout the sample. The samples were then loaded onto a floor sweeping tool. For the control sample and samples 1-3, the sweeping tool was then placed on the wet sample and the hydroentangling wings were wrapped around and secured into the holding port on top of the manual sweeping tool head. The spunlace covering fabric contacts the floor. The entire cleaning tool head and sample were weighed. For samples 4 and 5, a manual sweeping tool head was placed over the wet sample, and the sample was wrapped around the sweeping tool head and secured into a holding port on the top. The entire cleaning tool head and sample were weighed.

The sweeper head was loaded onto a test rig designed to mop 7.16ft using uniform pressure and speed². The sweeping tool head was then lowered to the linoleum floor and the press started on the floor cleaning test. The floor is cleaned in a cleaning pattern as shown in fig. 2. The cleaner head holder was modified so that a nominal 4.5 pounds of force was applied to the floor base and it operated at a nominal speed of 16.7 centimeters per second (6.6 inches per second). The equipment is then cleaned 7.16ft². Once the test equipment is at 7.16ft²The floor mop is run up, the floor is dried with microfiber cloth and the test is repeated by pressing in place on the machine and then starting without picking up the mop from the floor to reset to the starting position. This process is repeated until 21.46ft is completed²(three cycles). At the end of the third cycle, the floor sweeping tool was lifted from the floor, removed from the test apparatus, and weighed without removing the sample from the tool. The tool and sample were then placed back on the machine and the same procedure followed as above until 42.92ft of wipe²(three additional test cycles). The floor sweeping tool is again lifted from the floor, removed from the test apparatus, and weighed without being removed from the toolThe sample was removed. The tool and sample were then placed back on the machine and the same procedure followed as above until 71.6ft of wipe²(four additional test cycles). The total number of test cycles was ten.

Table 9: liquid Release study of control samples and samples 1-5

The results are summarized in Table 9. Samples 2 and 3, which contained eucalyptus pulp, retained more lotion than the control sample and sample 1. Specifically, at 71.6ft²In contrast, sample 2, which contained eucalyptus fibers in the layer on the floor side of the structure, retained 3.17% more lotion (by weight) than the control sample. In this case, the layer directly above the layer containing eucalyptus fibers provides a liquid storage area, and the bottom layer helps to release and distribute the lotion. The results also show that the non-embossed samples retained more lotion than the embossed samples.

Example 4: ceramic tile wetting test

The selected samples were further tested and compared in a tile wetting test with commercially available products. The tile wetting test is designed to compare how much area can be swept with the pre-wetted material before it stops releasing liquid. This example tests the number of 12 inch by 12 inch floor tiles and the pre-wetted material was wettable until an endpoint was reached where no more liquid was released.

The test area has dimensions of about 40 feet long and about 10 feet wide and includes waxed vinyl tile. Prior to testing, the test area was dry swept, wiped with clean water and dried.

The sample was weighed and placed on the head of a sweeping tool. The cleaning tool is then placed on the floor at one end of the test area and pushed towards the other end. The sweeping tool is then pushed back onto the dry portion of the test area adjacent to the previously swept area. The pattern was repeated and the floor was observed and marked when the sample no longer released any liquid. Once the sample no longer released liquid, the number of 12 inch by 12 inch tiles that had been mopped was recorded. After the sample has released all of the liquid, the sample is reweighed to determine the amount of liquid lost. Each test was repeated 3 times.

Three compositions were tested: control sample, sample 2 and sample 5. The compositions of these samples are provided in table 3, table 5 and table 8, respectively. Also tested commercially availableSweet Wet-havingAnd a wet mopThe Great Value wet mop. The results are summarized in Table 10.

Table 10: results of the tile wetting test

The results of the tile wetting test show that all three samples were able to wet on average more 12 inch by 12 inch tiles than the commercially available product. The control samples wetted 21 and 127 more tiles on average than the commercially available test products. Sample 5 wetted on average 51 and 157 more tiles than the commercially available test product. Sample 2 wetted on average 133 and 239 more tiles than the commercially available test product. These results show an increased metered release of liquid in a nonwoven material having a layer comprising eucalyptus fibers on the floor sweeping side.

Example 5: stain removal test

The selected samples were further tested to evaluate cleaning and stain removal efficacy. Three compositions were tested: control sample, sample 2 and sample 5. The compositions of these samples are presented in table 3, table 5 and table 8, respectively. Also tested commercially availableSweet Wet-havingAnd a wet mopThe Great Value wet mop. Using a Gardner in-line wash apparatus (WA-2175, model D16VF) operating at 1 pound pressure and 40 cycles/minute, 4 inch x 3 inch samples were cut and mounted on a scrub block. The apparatus was started and the number of cycles of removal of each of the five different stains from vinyl Tile (Armstrong floating 56830031Feature Tile R627A) was recorded. A schematic diagram of the test apparatus is shown in fig. 3. To create stains, the vinyl tile was cut into 4 inch wide strips and five (5) 1.5 inch ID O-rings were used to hold the solution as it dried on the vinyl tile. The solution (1mL) was added to the center of the O-ring every 1.5 hours until a total volume of 4mL was added. Five different solutions were used and stains were tested therefrom, one solution per O-ring, as described below. The solution was kept at room temperature for 72 hours until dry. The vinyl tile was then heated in an oven at 100 ° f for 1 hour. The samples were then tested over a period of 2-4 hours.

The following stains were tested: hot chocolate, coffee, orange juice (high pulp), grape juice, and potting soil. Hot chocolate (Swiss) was prepared according to the instructions) And adding powdered creamer (1 teaspoon, Coffee)). With instant coffee (Maxwell)) Water (180mL), sugar (1 teaspoon) and powdered creamer (Coffee)) Coffee is prepared. With potting soil (Miracle)) And a 50:50 blend of water potting soil was prepared to produce a slurry. Prior to testing, the O-rings were removed and loose dirt was knocked out to simulate sweeping the floor, leaving a mud stain on the vinyl tile prior to testing.

The results are summarized in Table 11.

Table 11: results of soil removal test

As shown in Table 11, the two commercial samples provided similar results except thatThe Great Value wet mops showed slightly improved results on average in removing orange juice, grape juice and soil stains (107 and 115 cycles, 10 and 11 cycles, and 8 and 9 cycles, respectively). For all tested stains except grape juice, the control sample provided improved results compared to the commercial product, where it on average showed a correlation withThe same result was obtained for the Great Value wet mop. Sample 5, on average, provided similar results in removing cocoa stains as the commercial sample, and on average, improved results in removing orange, grape and clay stains compared to the commercial sample, and on average required one more cycle to remove coffee stains than the commercial sample. Sample 2 provided overall improved results compared to the commercially available samples as well as the control sample and sample 5, requiring on average fewer cycles to clean any of the five stains.

Example 6: having eucalyptus only as pulpMultilayer integrated absorption of fibers for storing and metered release of liquids Structure of the product

Sample 6 is a unitary absorbent composite comprised of a single layer that provides for storage of liquid and metered release of liquid.

The composition of sample 6 is shown in table 12.

Table 12: sample 6 composition

Type of material	Raw materials	Basis weight (gsm)
			Paper pulp	Eucalyptus CFU	102.5
Synthetic fiber	Trevira T25547031.5 dtex	22.5
				Total of	125.0

The substrate was a 125gsm thermally bonded Dan-Web airlaid nonwoven (TBAL) product with 18 wt% bicomponent synthetic fibers. The sample comprised a single homogeneous layer. This layer contained 102.5gsm eucalyptus pulp (Suzano, untreated) and 22.5gsm synthetic fibers (Trevira type 255-1.5 dtex, 6 mm).

Example 7: storage and metering with eccentric fiber layer on top with eucalyptus only as pulp fiber Multi-layered unitary absorbent structure for delivering a quantity of liquid

Sample 7 is a unitary absorbent composite consisting of two layers stacked on top of each other, which provides for the storage of liquid and the metered release of liquid.

The composition of sample 7 is shown in table 13.

Table 13: sample 7 composition

The substrate was a 155gsm multi-bonded Dan-Web air-laid nonwoven (MBAL) product with 31.6% bicomponent synthetic fibers. The sample comprised two layers. The bottom layer contained 102.5gsm eucalyptus pulp (Suzano, untreated) and 22.5gsm synthetic fibers (Trevira type 255-1.5 dtex, 6 mm). The top layer contained 25gsm eccentric bicomponent fibers (Trevira type 255-6.7 dtex, 5 mm). 5gsm of adhesive (Wacker Vinnapas 192) was applied to the bottom (floor cleaning tool side) of the structure.

Example 8: absorbent and storage with eucalyptus fibers in the bottom layer and eccentric bicomponent fibers on the top layer Multilayer integrated absorption structure of liquid storage body

Sample 8 is a unitary absorbent composite consisting of three layers stacked on top of each other, which provides for the storage of liquid and the metered release of liquid.

The composition of sample 8 is shown in table 14.

Table 14: sample 8 composition

The substrate was a 200gsm, multi-bonded Dan-Web air-laid nonwoven (MBAL) product with 31.5% bicomponent synthetic fibers and 2.5% binder. The sample comprises three fibrous layers. The bottom layer contained 62gsm eucalyptus pulp (Suzano, untreated) and 8gsm synthetic fibers (Trevira type 255-1.5 dtex, 6 mm). The middle layer contained 70gsm cellulose (GP 4723, fully treated pulp made from Georgia-Pacific) and 30gsm synthetic fibers (Trevira type 255-1.7 dtex, 6 mm). The top layer contained 25gsm eccentric bicomponent fibers (Trevira type 255-6.7 dtex, 5 mm). 5gsm of adhesive (Wacker Vinnapas 192) was applied to the bottom (floor cleaning tool side) of the structure.

Example 9: absorbent article having eucalyptus fibers in the middle layer and eccentric bicomponent fibers on the top layer Liquid-storing multilayer integrated absorbent structure

Sample 9 is a unitary absorbent composite consisting of three layers stacked on top of each other, which provides for the storage of liquid and the metered release of liquid.

The composition of sample 9 is shown in table 15.

Table 15: sample 9 composition

The substrate was a 200gsm, multi-bonded Dan-Web air-laid nonwoven (MBAL) product with 31.5% bicomponent synthetic fibers and 2.5% binder. Sample 9 included three layers similar to sample 5. The bottom layer comprised 70gsm cellulose (GP 4723, fully treated pulp made by Georgia-Pacific) and 30gsm synthetic fibers (Trevira type 255-1.7 dtex, 6 mm). The middle layer contained 62gsm eucalyptus pulp (Suzano, untreated) and 8gsm synthetic fibers (Trevira type 255-1.5 dtex, 6 mm). The top layer contained 25gsm eccentric bicomponent fibers (Trevira type 255-6.7 dtex, 5 mm). 5gsm of adhesive (Wacker Vinnapas 192) was applied to the bottom (floor cleaning tool side) of the structure.

After providing the sample, 0.25gsm to 6gsm of tacky adhesive is added to the top layer (floor side), for example to increase particle pick-up.

Example 10: with eucalyptus in the middle layer and eccentricity on topStorage and application of bicomponent fibers Multi-layered unitary absorbent structure (basis weight versus material) for metered release of liquid

This embodiment provides an integrated absorbent composite consisting of three layers stacked on top of each other, designed to store liquid, provide metered release of liquid, and replace hydroentanglement used in commercially available disposable wet mops.

The compositions of sample 10A, sample 10B, sample 10C, and sample 10D are shown in table 16, table 17, table 18, and table 19, respectively.

Table 16: sample 10A composition

Sample 10A included three layers. The bottom layer comprised 70gsm cellulose (Golden Isles Leaf River 4725) and 30gsm synthetic fiber (Trevira T255474370% core 1.7 dtex, 6 mm). The middle layer contained 62gsm eucalyptus pulp (Suzano, untreated) and 8gsm synthetic fibers (Trevira T255470330% core 1.5 dtex, 6 mm). The top layer contained 25gsm eccentric bicomponent fibers (Trevira T-25516836.7 dtex, 6 mm). 5gsm of adhesive (Wacker Vinnapas 192) was applied to the bottom (floor cleaning tool side) of the structure. The total weight of the structure was calculated to be 200.0 gsm.

Table 17: sample 10B composition

Sample 10B included three layers. The bottom layer comprised 63.96gsm cellulose (Golden Isles Leaf River 4725) and 14.04gsm synthetic fiber (Trevira T255474370% core 1.7 dtex, 6 mm). The middle layer contained 42.64gsm eucalyptus pulp (Suzano, untreated) and 9.36gsm synthetic fibers (Trevira T255470330% core 1.5 dtex, 6 mm). The top layer contained 25gsm eccentric bicomponent fibers (Trevira T-25516836.7 dtex, 6 mm). 5gsm of adhesive (Wacker Vinnapas 192) was applied to the bottom (floor cleaning tool side) of the structure. The total weight of the structure was calculated to be 160.0 gsm.

Table 18: sample 10C composition

Sample 10C included three layers. The bottom layer comprised 70gsm cellulose (Golden Isles Leaf River 4725) and 30gsm synthetic fiber (Trevira T2551661 PEPEPEPE 2.2 dtex, 6 mm). The middle layer contained 62gsm eucalyptus pulp (Suzano, untreated) and 8gsm synthetic fibers (Trevira T2551661 PEPET 2.2 dtex, 6 mm). The top layer contained 25gsm eccentric bicomponent fibers (Trevira T-25516836.7 dtex, 6 mm). 5gsm of adhesive (Wacker Vinnapas 192) was applied to the bottom (floor cleaning tool side) of the structure. The total weight of the structure was calculated to be 200.0 gsm.

Table 19: sample 10D composition

Sample 10D included three layers. The bottom layer comprised 63.96gsm cellulose (Golden Isles Leaf River 4725) and 14.04gsm synthetic fiber (Trevira T2551661 PEPEPEPE 2.2 dtex, 6 mm). The middle layer contained 42.64gsm eucalyptus pulp (Suzano, untreated) and 9.36gsm synthetic fibers (Trevira T25547031.5 dtex). The top layer contained 25gsm eccentric bicomponent fibers (Trevira T-25516836.7 dtex, 6 mm). 5gsm of adhesive (Wacker Vinnapas 192) was applied to the bottom (floor cleaning tool side) of the structure. The total weight of the structure was calculated to be 160.0 gsm.

Example 11: ceramic tile wetting test

The samples of example 10 (sample 10A, sample 10B, sample 10C, and sample 10D) were tested and compared to commercially available products in the tile wetting test, the method of which is provided in example 4. A list of test samples is shown in table 20. The results are summarized in Table 21.

Table 20: sample for testing

Control samples a and B were tested. Samples K and L each had the same composition as sample 2 provided in table 5. Samples K and L were embossed between two hydroentangling sheets. Samples C, E, F, H, K and L each had the same imprint pattern as sample B. Samples D, G, I and J used different embossing patterns. Samples C, E, F, G, H, I and K used the same lotion as sample B (represented by a commercially available wipe). Samples D, J and L used a different lotion than samples C, E, F, G, H, L and K (multipurpose floor cleaning lotion).

Table 21: results of the tile wetting test

The results show that samples C to L containing eucalyptus pulp retained more lotion than control samples a and B. In particular, samples C through J, which included a layer comprising eucalyptus pulp, and samples K and L, which were used as core products between hydroentanglements, each had a lower average percent lotion loss than control samples a and B.

Example 12: stain removal test

Sample 10C was further tested to evaluate the ability of the sample to clean and remove stains. Sample 10C was tested in the dry state and a tackifier (about 3gsm) was applied to the top layer of the material (floor surface) in the dry state. The composition of sample 10C is provided in table 18. Also tested commercially availableMicrofiber cloth andwet Jet-disposable mop. The results are summarized in Table 22. Using a Gardner in-line wash apparatus (WA-2175, model D16VF) operating at 1 pound pressure and 40 cycles/minute, 4 inch x 3 inch samples were cut and mounted on a scrub block. The apparatus was started and the number of cycles of removal of each of the five different stains from vinyl Tile (Armstrong floating 56830031Feature Tile R627A) was recorded. A schematic diagram of the test apparatus is shown in fig. 3. To create stains, the vinyl tile was cut into 4 inch wide strips and five (5) 1.5 inch ID O-rings were used to hold the solution as it dried on the vinyl tile. The solution (1mL) was added to the center of the O-ring every 1.5 hours until a total volume of 4mL was added. Five different solutions were used and stains were tested therefrom, one solution per O-ring, as described below. The solution was kept at room temperature for 72 hours until dry. The vinyl tile was then heated in an oven at 100 ° f for 1 hour. The samples were then tested over a period of 2-4 hours.

The following stains were tested: hot chocolate, coffee, orange juice (high pulp), grape juice, and potting soil. Hot chocolate (Swiss) was prepared according to the instructions) And adding powdered creamer (1 teaspoon, Coffee)). With instant coffee (Maxwell)) Water (180mL), sugar (1 teaspoon) and powdered creamer (Coffee)) Coffee is prepared. With potting soil (Miracle)) And a 50:50 blend of water potting soil was prepared to produce a slurry. Prior to testing, the O-rings were removed and loose dirt was knocked out to simulate sweeping the floor, leaving a mud stain on the vinyl tile prior to testing.

To perform the test, a cleaning solution (approximately 2mL) was added to each of the stains using a pipette. The same cleaning solution (about 15mL) was poured onto the floor cleaning test pad using a graduated cylinder. Will haveReloading with lavender vanilla and pleasant aromaThe Wet Jet multipurpose floor cleaner solution was used for all samples.

The results are summarized in Table 22.

Table 22: results of soil removal test

Stop testing when 200 cycles were reached

As provided in Table 22, with commercially availableMicrofiber cloth andthe Wet Jet-disposable mop shows improved average results in removing orange juice stains for samples 10C (dry) and 10C (dry with tackifier).

***

In addition to the various embodiments depicted and claimed, the presently disclosed subject matter also relates to other embodiments having other combinations of the features disclosed and claimed herein. Thus, the particular features presented herein may be combined with each other in other ways within the scope of the presently disclosed subject matter such that the presently disclosed subject matter includes any suitable combination of the features disclosed herein. The foregoing descriptions of specific embodiments of the presently disclosed subject matter have been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the presently disclosed subject matter to those embodiments disclosed.

It will be apparent to those skilled in the art that various modifications and variations can be made in the system and method of the presently disclosed subject matter without departing from the spirit or scope of the presently disclosed subject matter. Thus, it is intended that the disclosed subject matter include modifications and variations as fall within the scope of the appended claims and their equivalents.