EP1239800A4 - ABSORBENT COMPOSITE ROD - Google Patents
ABSORBENT COMPOSITE RODInfo
- Publication number
- EP1239800A4 EP1239800A4 EP00965429A EP00965429A EP1239800A4 EP 1239800 A4 EP1239800 A4 EP 1239800A4 EP 00965429 A EP00965429 A EP 00965429A EP 00965429 A EP00965429 A EP 00965429A EP 1239800 A4 EP1239800 A4 EP 1239800A4
- Authority
- EP
- European Patent Office
- Prior art keywords
- composite
- absorbent
- absorbent material
- fibrous
- regions
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/531—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad
- A61F13/532—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
- A61F13/535—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/42—Use of materials characterised by their function or physical properties
- A61L15/60—Liquid-swellable gel-forming materials, e.g. super-absorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
- B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/425—Cellulose series
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
- D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
- D04H1/732—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by fluid current, e.g. air-lay
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F2013/530481—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/06—Vegetal fibres
- B32B2262/062—Cellulose fibres, e.g. cotton
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/06—Vegetal fibres
- B32B2262/062—Cellulose fibres, e.g. cotton
- B32B2262/067—Wood fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2305/00—Condition, form or state of the layers or laminate
- B32B2305/02—Cellular or porous
- B32B2305/026—Porous
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/72—Density
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2555/00—Personal care
- B32B2555/02—Diapers or napkins
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
- D04H1/43835—Mixed fibres, e.g. at least two chemically different fibres or fibre blends
Definitions
- the present invention relates generally to an absorbent composite and, more particularly, to an air-laid composite that includes absorbent material.
- Cellulose fibers derived from wood pulp are used in a variety of absorbent articles, for example, diapers, incontinence products, and feminine hygiene products. It is desirable for the absorbent articles to have a high absorbent capacity for liquid, rapid liquid acquisition, low rewet, as well as to have good dry and wet strength characteristics for durability in use and effective fluid management.
- the absorbent capacity of articles made from cellulose fibers is often enhanced by the addition of absorbent materials, such as superabsorbent polymers.
- superabsorbent polymers known in the art have the capability to absorb liquids in quantities from 5 to 100 times or more their weight. Thus, the presence of superabsorbent polymers greatly increases the liquid holding capacity of absorbent articles made from cellulose.
- absorbent composites that contain superabsorbent materials commonly suffer from gel blocking. Upon liquid absorption, superabsorbent materials tend to coalesce and form a gelatinous mass which prevents the wicking of liquid to unwetted portions of the composite. By preventing distribution of acquired liquid from a composite's unwetted portions, gel blocking precludes the effective and efficient use of superabsorbent materials in fibrous composites.
- the wicking capacity of conventional fibrous composites that include relatively homogeneous distributions of superabsorbent material is generally significantly reduced after initial liquid insult. The diminished capacity of such fibrous composites results from narrowing of capillary acquisition and distribution channels that accompanies superabsorbent material swelling. The diminution of absorbent capacity and concomitant loss of capillary distribution channels for conventional absorbent cores that include superabsorbent material is manifested by decreased liquid acquisition rates and far from ideal liquid distribution on successive liquid insults.
- an absorbent composite that includes superabsorbent material and that effectively acquires and wicks liquid throughout the composite and distributes the acquired liquid to absorbent material where the liquid is efficiently absorbed and retained without gel blocking.
- a need also exists for an absorbent composite that continues to acquire and distribute liquid throughout the composite on successive liquid insults.
- an absorbent composition containing superabsorbent materials that exhibits the advantages associated with wet-laid composites including wet strength, absorbent capacity and acquisition, liquid distribution, softness, and resilience. The present invention seeks to fulfill these needs and provides further related advantages.
- the present invention provides a fibrous absorbent composite that includes absorbent material distributed throughout the composite and in selected regions of the composite.
- concentration of absorbent material in these regions can be varied to provide a composite having variable absorbent material concentration.
- the composite includes absorbent material dispersed in bands across the composite's width and that extend along the composite's length.
- the composite's bands enriched with absorbent material swell with acquired liquid and expand and rise from the composite's wetted surface to form ridges and to provide a fluted structure.
- the wetted composite's fluted structure enhances liquid wicking, acquisition, and distribution on subsequent liquid insult.
- a method for forming an absorbent composite having variable absorbent material content includes increasing the concentration of absorbent material in the composite by adding absorbent material to selective regions of the composite. In another embodiment, the method provides for forming regions of increased absorbent material concentration in the composite by selectively increasing the composite's basis weight. In the method, the composite is formed by selectively densifying a substantially homogeneous composite containing fibers and absorbent material.
- FIGURE 1 is a lateral cross-sectional view of a representative fluted absorbent composite formed in accordance with the present invention
- FIGURE 2 is a perspective view of the composite shown in FIGURE 1 ;
- FIGURE 3 is a lateral cross-sectional view of a representative fluted absorbent composite of the present invention in a wetted state
- FIGURE 4 is a perspective view of the wetted composite shown in FIGURE 3;
- FIGURE 5 is a lateral cross-sectional view of a representative composite that includes a relatively homogeneous distribution of fibers and absorbent material;
- FIGURE 6 is a lateral cross-sectional view of an absorbent construct that includes a representative fluted absorbent composite formed in accordance with the present invention
- FIGURE 7 is a lateral cross-sectional view of another absorbent construct that includes a representative fluted absorbent composite formed in accordance with the present invention
- FIGURE 8 is a lateral cross-sectional view of the composite shown in FIGURE 5 with an overlying acquisition layer;
- FIGURE 9 is a lateral cross-sectional view of the composite shown in
- FIGURE 5 with an overlying acquisition layer
- FIGURE 10 is a lateral cross-sectional view of a portion of an absorbent article incorporating a representative fluted absorbent composite formed in accordance with the present invention
- FIGURE 1 1 is a lateral cross-sectional view of a portion of another absorbent article incorporating a representative fluted absorbent composite formed in accordance with the present invention
- FIGURE 12 is a lateral cross-sectional view of a portion of another absorbent article incorporating a representative fluted absorbent composite formed in accordance with the present invention
- FIGURE 13 is a lateral cross-sectional view of a portion of another absorbent article incorporating a representative fluted absorbent composite formed in accordance with the present invention.
- the absorbent composite of the present invention is a fibrous composite that includes absorbent material distributed throughout the composite and in selected regions of the composite. The concentration of absorbent material in these regions can be varied to provide a composite having variable absorbent material content.
- the absorbent composite includes absorbent material dispersed in bands across the composite ' s width (i.e., cross-machine direction) and that extend along the composite's length (i.e., machine direction). Distribution zones that are composed primarily of fibers lie between the composite's bands enriched with absorbent material. The composite's fibrous distribution zones serve to acquire liquid contacting the composite and to distribute the acquired liquid throughout the composite and, ultimately, to the absorbent material.
- the absorbent material serves to absorb and retain liquid acquired by the composite.
- the absorbent composite can be advantageously incorporated into a variety of absorbent articles such as diapers including disposable diapers and training pants; feminine care products including sanitary napkins, tampons, and pant liners: adult incontinence products; toweling; surgical and dental sponges; bandages; food tray pads; and the like.
- the composite is highly absorbent, the composite can be included into an absorbent article as a liquid storage core.
- the composite can be combined with one or more other composites or layers including, for example, an acquisition and/or a distribution layer. Because of the composite's capacity to rapidly acquire and distribute liquid, the composite can also serve as an liquid management layer that acquires and releases a portion of the acquired liquid to an underlying storage core.
- the absorbent composite can be combined with a storage core to provide an absorbent construct that is useful in absorbent articles.
- the absorbent composite of the present invention is a fluted storage composite.
- the term "fluted” refers to the nature of the composite, which on wetting, develops ridges and becomes a fluted structure as a result of absorbent material expansion.
- the composite includes regions (i.e., bands) enriched with absorbent material that are distributed across the composite's width and that extend in bands along the composite's length.
- the absorbent material swells resulting in a wetted composite having ridges that include swollen absorbent material.
- the composite's ridges are separated by distribution zones or channels, which are fibrous regions of the composite that include lesser amounts of absorbent material relative to the composite's absorbent material enriched regions.
- FIGURES 1 -4 The banded nature of the fluted absorbent composite of the present invention is illustrated in FIGURES 1 -4.
- a representative fluted absorbent composite indicated generally by reference numeral 10 formed in accordance with the present invention includes regions 12 (i.e., liquid storage zones) enriched with absorbent material and regions 14 (i.e., liquid distribution zones) that are generally fibrous regions and include relatively lesser amounts of absorbent material compared to regions 12.
- Liquid is rapidly acquired by the predominantly fibrous regions of the composite when the absorbent composite is contacted with liquid.
- the fibrous regions are relatively open and porous in nature and promote rapid liquid acquisition, wicking, and distribution.
- Liquid acquired by the composite generally travels rapidly longitudinally through the fibrous composite along the composite's length via the distribution zones (i.e., regions 14) and is absorbed by regions of the composite enriched with absorbent material (i.e., regions 12).
- the acquired liquid is generally wicked laterally into the absorbent material as the liquid is distributed along the composite's length.
- the fluted composite For the fluted composite, successive liquid insults are absorbed at even greater rate through the establishment of flutes and corresponding channels on initial liquid insult. On wetting, the composite of the present invention becomes on a fluted structure having channels for rapidly acquiring additional liquid and distributing the liquid to sites that are remote to insult. For the fluted composite, acquisition times for subsequent liquid insult are generally less than that for the initial acquisition. Reduced acquisition times for successive liquid insults is not generally observed for conventional absorbent constructs. Because conventional absorbent structures cannot form a fluted structure and therefore lack channels for distributing additional liquid, acquisition times for these structures generally increase with successive liquid insults. Increased acquisition time can be attributed to the fact that liquid is only slowly acquired and distributed through a composite's saturated regions to more remote regions of the composite that are capable of absorbing liquid. Thus, the fluted absorbent composite provides initial liquid acquisition rates that are generally comparable to or greater than those for conventional absorbent structures. The composite also has significantly increased rates of liquid acquisition for successive liquid acquisition relative to conventional composites.
- FIGURES 3 and 4 Wet structures of the fluted absorbent composite of the present invention are shown in FIGURES 3 and 4. These figures illustrate the fluted nature of the composite, which results from liquid contact and swelling and expansion of absorbent material.
- absorbent material enriched regions 12 i.e., liquid storage regions
- regions 14 i.e., liquid distribution zones
- Fibers are a principal component of the fluted absorbent composite of this invention.
- Fibers suitable for use in the present invention are known to those skilled in the art and include any fiber from which an absorbent composite can be formed. Suitable fibers include natural and synthetic fibers. Combinations of fibers including combinations of synthetic and natural fibers, and treated and untreated fibers, can also be suitably used in the composite.
- the absorbent composite of the present invention includes cellulosic fibers, hardwood fibers, chemithermomechanical pulp fibers (i.e., CTMP) and, more preferably, crosslinked cellulosic fibers.
- fibers are present in the composite in an amount from about 20 to about 90 weight percent, preferably from about 50 to about 70 weight percent, based on the total weight of the composite. In a preferred embodiment, the composite includes about 60 weight percent fibers.
- Cellulosic fibers can be a basic component of the fluted absorbent composite. Although available from other sources, cellulosic fibers are derived primarily from wood pulp. Suitable wood pulp fibers for use with the invention can be obtained from well-known chemical processes such as the Kraft and sulfite processes, with or without subsequent bleaching. Pulp fibers can also be processed by thermomechanical, chemithermomechanical methods, or combinations thereof. The preferred pulp fiber is produced by chemical methods. Ground wood fibers, recycled or secondary wood pulp fibers, and bleached and unbleached wood pulp fibers can be used. Softwoods and hardwoods can be used. Details of the selection of wood pulp fibers are well known to those skilled in the art.
- Fibers are commercially available from a number of companies, including Weyerhaeuser Company, the assignee of the present invention.
- suitable cellulose fibers produced from southern pine that are usable with the present invention are available from Weyerhaeuser Company under the designations CF416, NF405, PL416, FR516, and NB416.
- the wood pulp fibers of the present invention can also be pretreated prior to use with the present invention.
- This pretreatment may include physical treatment, such as subjecting the fibers to steam, or chemical treatment, for example, crosslinking the cellulose fibers using any one of a variety of crosslinking agents.
- Crosslinking increases fiber bulk and resiliency, and thereby can improve the composite ' s absorbency.
- crosslinked fibers are twisted or crimped.
- the use of crosslinked fibers allows the composite to be more resilient, softer, bulkier, and to have enhanced wicking.
- Suitable crosslinked cellulose fibers produced from southern pine are available from Weyerhaeuser Company under the designation NHB416.
- Crosslinked cellulose fibers and methods for their preparation are disclosed in U.S. Patents Nos. 5,437,418 and 5,225,047 issued to Graef et al.. expressly incorporated herein by reference.
- Crosslinked fibers are prepared by treating fibers with a crosslinking agent.
- Suitable cellulose crosslinking agents include aldehyde and urea-based formaldehyde addition products. See, for example, U.S. Patents Nos. 3,224.926; 3.241,533; 3,932,209: 4,035,147; 3,756,913; 4.689,1 18; 4.822,453; U.S. Patent No. 3,440,135. issued to Chung; U.S. Patent No. 4,935,022, issued to Lash et al.; U.S. Patent No. 4,889,595, issued to Herron et al.; U.S. Patent No. 3,819,470, issued to Shaw et al.; U.S.
- Cellulose fibers have also been crosslinked by carboxylic acid crosslinking agents including polycarboxylic acids.
- U.S. Patents Nos. 5,137,537; 5,183,707; and 5,190,563, describe the use of C 2 -C 9 polycarboxylic acids that contain at least three carboxyl groups (e.g., citric acid and oxydisuccinic acid) as crosslinking agents.
- Suitable urea-based crosslinking agents include methylolated ureas, methylolated cyclic ureas, methylolated lower alkyl cyclic ureas, methylolated dihydroxy cyclic ureas, dihydroxy cyclic ureas, and lower alkyl substituted cyclic ureas.
- urea-based crosslinking agents include dimethvldihydroxy urea (DMDHU, l ,3-dimethyl-4.5-dihydroxy-2-imidazolidinone), dimethylol- dihydroxyethylene urea (DMDHEU, l,3-dihydroxymethyl-4,5-dihydroxy-2- imidazolidinone), dimethylol urea (DMU, bis[N-hydroxymethyl]urea), dihydroxy- ethylene urea (DHEU, 4,5-dihydroxy-2-imidazolidinone), dimethylolethylene urea (DMEU, l,3-dihydroxymethyl-2-imidazolidinone), and dimethyldihydroxyethylene urea (DDI, 4.5-dihydroxy-l ,3-dimethyl-2-imidazolidinone).
- DMDHU dimethvldihydroxy urea
- DMDHEU dimethylol- dihydroxyethylene urea
- DMU dimethylol urea
- DMU
- Suitable polycarboxylic acid crosslinking agents include citric acid, tartaric acid, malic acid, succinic acid, glutaric acid, citraconic acid, itaconic acid, tartrate monosuccinic acid, and maleic acid.
- Other polycarboxylic acids crosslinking agents include polymeric polycarboxylic acids such as poly(acrylic acid), poly(methacrylic acid).
- polymeric polycarboxylic acid crosslinking agents such as polyacrylic acid polymers, polymaleic acid polymers, copolymers of acrylic acid, and copolymers of maleic acid is described in U.S. patent application Serial No. 08/989,697, filed December 12, 1997, and assigned to Weyerhaeuser Company. Mixtures or blends of crosslinking agents may also be used.
- the crosslinking agent can include a catalyst to accelerate the bonding reaction between the crosslinking agent and cellulose fiber.
- Suitable catalysts include acidic salts, such as ammonium chloride, ammonium sulfate. aluminum chloride, magnesium chloride, and alkali metal salts of phosphorous-containing acids.
- pretreating fibers include the application of surfactants or other liquids which modify the surface chemistry of the fibers.
- Other pretreatments include incorporation of antimicrobials, pigments, dyes and densification or softening agents.
- Fibers pretreated with other chemicals, such as thermoplastic and thermosetting resins also may be used. Combinations of pretreatments also may be employed. Similar treatments can also be applied after the composite formation in post-treatment processes.
- Cellulosic fibers treated with particle binders and/or densification/softness aids known in the art can also be employed in accordance with the present invention.
- the particle binders serve to attach other materials, such as cellulosic fiber superabsorbent polymers, as well as others, to the cellulosic fibers.
- Cellulosic fibers treated with suitable particle binders and/or densification/softness aids and the process for combining them with cellulose fibers are disclosed in the following U.S. patents and patent applications: (1) Patent No. 5,543,215, entitled “Polymeric Binders for Binding Particles to Fibers” ; (2) Patent No. 5,538,783, entitled “Non- Polymeric Organic Binders for Binding Particles to Fibers"; (3) Patent No.
- synthetic fibers including polymeric fibers, such as polyolefin. polyamide, polyester, polyvinyl alcohol, and polyvinyl acetate fibers can also be used in the absorbent composite of the present invention.
- Suitable polyolefin fibers include polyethylene and polypropylene fibers.
- Suitable polyester fibers include polyethylene terephthalate fibers.
- Other suitable synthetic fibers include, for example, nylon and rayon fibers.
- the absorbent composite can also include combinations of natural and synthetic fibers.
- the absorbent composite includes a combination of pulp fibers (e.g., Weyerhaeuser designation NB416) and crosslinked cellulosic fibers (e.g., Weyerhaeuser designation NBH416). Pulp fibers preferably present in such a combination in an amount from about 15 to about 85 weight percent. In another preferred embodiment, the absorbent composite includes a combination of pulp fibers present in the composite in about 50 weight percent and crosslinked cellulosic fibers present in the composite in about 50 weight percent based on the total weight of fibers.
- pulp fibers e.g., Weyerhaeuser designation NB416
- crosslinked cellulosic fibers e.g., Weyerhaeuser designation NBH416
- Pulp fibers preferably present in such a combination in an amount from about 15 to about 85 weight percent.
- the absorbent composite includes a combination of pulp fibers present in the composite in about 50 weight percent and crosslinked cellulosic fibers present in the composite in about 50 weight percent based on the
- the fluted absorbent composite of the present invention can serve as a storage layer for acquired liquids when incorporated into an absorbent article.
- the composite includes absorbent material.
- absorbent material is generally located throughout the composite and in increased concentrations in selected regions of the composite. These selected regions include bands incorporated into the composite. The bands are positioned across the composite's width and extend along the composite's length.
- the composite's bands are regions of the composite that are enriched with absorbent material.
- the bands of absorbent material can be configured in virtually any shape, size, and composite location. Suitable configurations of the composite's bands include any configuration that does not significantly impede liquid acquisition or promote gel blocking.
- the composite's distribution zones also include some absorbent material. However, the liquid absorbent capacity of the absorbent material in the composite's bands is significantly greater than the absorbent material present in the composite's distribution zones.
- the term " absorbent material” refers to a material that absorbs water and that generally has an absorbent capacity greater than the cellulosic fibrous component of the composite.
- the absorbent material is a water swellable, generally water insoluble material capable of absorbing at least about 5, desirably about 20, and preferably about 100 times or more its weight in water.
- the absorbent material can be swellable in the dispersion medium utilized in the composite forming method.
- the absorbent material is untreated and swellable in the dispersion medium.
- the amount of absorbent material present in the composite can vary greatly depending on the composite's intended use.
- the amount of absorbent material present in a composite incorporated into as an absorbent core for an infant's diaper can be from about 10 to about 80 weight percent, preferably from about 30 to about 50 weight percent, based on the total weight of the composite.
- the absorbent material may include natural materials such as agar, pectin, and guar gum. and synthetic materials, such as synthetic hydrogel polymers.
- Synthetic hydrogel polymers include, for example, carboxymethyl cellulose, alkaline metal salts of polyacrylic acid, polyacrylamides, polyvinyl alcohol, ethylene maleic anhydride copolymers. polyvinyl ethers, hydroxypropyl cellulose, polyvinyl morpholinone, polymers and copolymers of vinyl sulphonic acid, polyacrylates, polyacrylamides, and polyvinyl pyridine among others.
- the absorbent material is a superabsorbent material.
- a "superabsorbent material” refers to a polymeric material that is capable of absorbing large quantities of fluid by swelling and forming a hydrated gel (i.e., a hydrogel). In addition to absorbing large quantities of fluids, superabsorbent polymers can also retain significant amounts of bodily fluids under moderate pressure.
- Superabsorbent materials generally fall into three classes: starch graft copolymers, crosslinked carboxymethylcellulose derivatives, and modified hydrophilic polyacrylates.
- absorbent polymers include hydrolyzed starch-acrylonitrile graft copolymers, neutralized starch-acrylic acid graft copolymers, saponified acrylic acid ester-vinyl acetate copolymers, hydrolyzed acrylonitrile copolymers or acrylamide copolymers, modified crosslinked polyvinyl alcohol, neutralized self-crosslinking polyacrylic acids, crosslinked polyacrylate salts, carboxylated cellulose, and neutralized crosslinked isobutylene-maleic anhydride copolymers.
- Superabsorbent polymers are available commercially, for example, polyacrylates from Clariant of Portsmouth. Virginia. These superabsorbent polymers come in a variety of sizes, morphologies and absorbent properties (available from Clariant under trade designations such as IM 3500 and IM 3900). Other superabsorbent polymers are marketed under the trademarks SANWET (supplied by Sanyo Kasei Kogyo Kabushiki Kaisha), and SXM77 and SRI 001 (supplied by Stockhausen of Greensboro, North Carolina). Other superabsorbent materials are described in U.S. Patent No. 4,160,059; U.S. Patent No. 4,676,784; U.S. Patent No. 4,673,402; U.S.
- Suitable superabsorbent materials useful in the absorbent composite of the present invention include superabsorbent particles and superabsorbent fibers.
- the fluted absorbent composite of the present invention can be formed by air- laid methods known to those of ordinary skill in the pulp processing art. Representative air-laid processes are generally described in U.S. Patent Nos. 4.640,810 and 4,065,832, both expressly incorporated herein by reference.
- air-laid fibrous webs that include absorbent materials such as superabsorbent materials are known in the art. In these webs, absorbent materials are conventionally distributed uniformly throughout the web.
- Conventional air-laid webs that contain absorbent material typically suffer gel blocking which limits the rate of liquid acquisition, distribution, and can adversely impact absorbent capacity. Air-laid webs also tend to have lower acquisition rates, absorbent capacity, and tensile strength compared to wet-laid fibrous webs.
- the air-laid composites formed in accordance with the present invention have enhanced liquid absorbent properties, including increased acquisition rate, compared to air-laid composites having absorbent material uniformly distributed throughout the entire web.
- the fluted absorbent composite of the present invention is a composite having absorbent material concentrations that vary between adjacent regions of the composite.
- the variation in absorbent material concentration provides a composite having differential liquid absorption and swelling characteristics.
- the composite can be formed by any method that provides a fibrous composite having variable absorbent material content.
- the composite can be formed by varying the basis weight of a composite formed from a homogeneous blend of absorbent material and fibers (e.g., a fibrous composite having a relatively uniform concentration of absorbent material).
- the composite can be formed by selectively varying absorbent material concentration in the composite (i.e., across the composite's width to provide bands or regions that are enriched with absorbent material).
- Variable basis weight composites can be formed by a number of methods including methods that affect the laydown of materials (i.e., fibers and absorbent material) during the air-lay process.
- a composite having variable basis weight can be formed by creating zones of differing porosity or air permeability on the foraminous support (e.g., forming wire) on which the composite is formed. Airflows carrying fibers and absorbent material will bias to lower resistance zones on the support (i.e., material flows bias toward high porosity).
- higher basis weight regions are created in the composite where flow through the support is least restrictive and lower basis weight regions are created where the flow is more restricted.
- the support's backing plate can be shaped into patterns that permit drawing forming air through areas of the support at a rate that is greater than for other areas. Such a method also biases the laydown of material to provide a composite having higher basis weight regions (i.e., regions of higher airflow) and lower basis weight regions (i.e., regions of lower airflow).
- the methods noted above can also provide fibrous webs having absorbent material concentration gradients.
- a previously deposited fibrous web can be subjected to forming airflow carrying absorbent material.
- absorbent material applied to the deposited web is distributed throughout the web based on airflow through the deposited web.
- absorbent material can be added to a fibrous web by any other method that provides for the formation of bands or other absorbent material enriched regions in the composite.
- Composites of the present invention having variable basis weight and variable absorbent material concentration can also be formed from composites that are relatively homogeneous blends of fibers and absorbent material (i.e., composites having a relatively uniform concentration of absorbent material).
- fibers and absorbent material are first laid on a foraminous support to provide a composite having a homogeneous blend of fibers and absorbent material.
- the homogeneous air-laid web's upper surface is scarfed (i.e., removed) to provide a web having ridges and valleys.
- a representative homogeneous web formed by air laying fibers and absorbent material followed by scarfing is shown in FIGURE 5.
- scarfed web 20 includes ridges 22 and valleys 24.
- the homogeneous composite is then densified to, for example, a relatively uniform thickness (i.e., caliper).
- a relatively uniform thickness i.e., caliper
- the materials in the scarfed web's ridges are compacted.
- densification provides an air-laid web having a relatively uniform in thickness.
- the method provides a composite that includes regions having increased basis weight and regions having increased absorbent material concentration.
- the method provides a composite that can be represented by composite 10 shown in FIGURE 1.
- composite 10 includes regions 12 that are enriched with absorbent material.
- regions 12 have an absorbent material concentration that is increased relative to regions 14.
- regions 12 also have a basis weight that is increased relative to regions 14.
- the fluted absorbent composite of the present invention can be incorporated as an absorbent core or storage layer in an absorbent article including, for example, a diaper or feminine care product.
- the absorbent composite can be used alone, or as illustrated in FIGURES 6 and 7, can be used in combination with one or more other layers.
- FIGURE 6 illustrates absorbent construct 30 where composite 10 is employed as a storage layer in combination with an upper acquisition layer 32.
- construct 40 includes a third layer 42 (e.g., distribution layer) that can also be employed, if desired, with composite 10 and acquisition layer 32.
- construct 30 can be formed by overlying an acquisition layer on a scarfed web followed by densification.
- construct 50 includes scarfed web 20 and acquisition layer 32.
- the acquisition layer can be formed to substantially occupy the valleys formed in the scarfed web.
- construct 60 includes scarfed web 20 and acquisition layer 32, which substantially occupies the web's valleys. Densification of constructs 50 or 60 provides construct 30.
- absorbent article 70 includes absorbent composite 10 and has a liquid pervious facing sheet 52 and a liquid impervious backing sheet 54.
- absorbent article 80 includes absorbent composite 10 and an overlying acquisition layer 32.
- a liquid pervious facing sheet 52 overlies acquisition layer 32, and a liquid impervious backing sheet 54 underlies absorbent composite 10.
- FIGURE 12 illustrates absorbent construct 90, which further includes distribution layer 42 inte ⁇ osed between acquisition layer 32 and composite 10.
- FIGURE 13 a typical construction of an adult incontinence absorbent structure is shown in FIGURE 13.
- article 100 includes facing sheet 52, acquisition layer 32, absorbent composite 10, and backing sheet 54. Facing sheet 22 is pervious to liquid while backing sheet 24 is impervious to liquid.
- a liquid pervious tissue 44 composed of a polar, fibrous material is positioned between absorbent composite 10 and acquisition layer 32.
- the present invention provides a fibrous absorbent composite containing absorbent material and methods for its formation.
- the absorbent composite is a fibrous structure that includes absorbent material dispersed throughout the composite and in increased concentration in bands across the composite's width that extend along the composite's length. Between the bands of absorbent material, the absorbent composite includes fibrous distribution zones that prevent gel blocking in the composite. After initial liquid insult, the composite develops ridges that open the fibrous structure and increase the liquid acquisition rate for subsequent liquid insults.
- the combination of ridges enriched with absorbent material and fibrous distribution zones allows for total utilization of the absorbent composite as a storage core when incorporated into an absorbent article such as a diaper.
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Animal Behavior & Ethology (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- General Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Epidemiology (AREA)
- Chemical & Material Sciences (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Hematology (AREA)
- Dispersion Chemistry (AREA)
- Nonwoven Fabrics (AREA)
- Absorbent Articles And Supports Therefor (AREA)
- Orthopedics, Nursing, And Contraception (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15545999P | 1999-09-21 | 1999-09-21 | |
US155459P | 1999-09-21 | ||
PCT/US2000/026361 WO2001021122A1 (en) | 1999-09-21 | 2000-09-20 | Fluted absorbent composite |
Publications (2)
Publication Number | Publication Date |
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EP1239800A1 EP1239800A1 (en) | 2002-09-18 |
EP1239800A4 true EP1239800A4 (en) | 2003-02-12 |
Family
ID=22555519
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00965429A Withdrawn EP1239800A4 (en) | 1999-09-21 | 2000-09-20 | ABSORBENT COMPOSITE ROD |
Country Status (7)
Country | Link |
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EP (1) | EP1239800A4 (ja) |
JP (1) | JP2003509162A (ja) |
KR (1) | KR20020035611A (ja) |
AU (1) | AU7614900A (ja) |
CA (1) | CA2383299A1 (ja) |
MX (1) | MXPA02003143A (ja) |
WO (1) | WO2001021122A1 (ja) |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030120230A1 (en) * | 2001-12-20 | 2003-06-26 | Wulz Andrea Susan | Absorbent article exhibiting improved fluid distribution |
BR0307324A (pt) * | 2002-02-04 | 2004-12-07 | Fuller H B Licensing Financ | Pano não tecido que inclui uma região superabsorvente e artigos incluindo o mesmo |
US7001167B2 (en) * | 2002-07-30 | 2006-02-21 | Kimberly-Clark Worldwide, Inc. | Apparatus and form for making an air formed fibrous web |
US20040087928A1 (en) * | 2002-10-30 | 2004-05-06 | Ducker Paul M. | Method of making preformed absorbent cores and absorbent cores produced thereby |
DE102004019476A1 (de) * | 2004-04-22 | 2005-11-24 | Saueressig Gmbh & Co. | Verfahren zum Herstellen eines absorbierenden Faserproduktes |
WO2006004464A1 (en) | 2004-07-02 | 2006-01-12 | Sca Hygiene Products Ab | Absorbent layer structure |
KR100675848B1 (ko) * | 2005-04-20 | 2007-01-30 | 주식회사 엘지생활건강 | 일회용 기저귀의 초박형 흡수코어 및 그 제조방법 |
JP5210553B2 (ja) * | 2007-06-19 | 2013-06-12 | ユニ・チャーム株式会社 | 吸収性物品 |
JP2010136899A (ja) * | 2008-12-11 | 2010-06-24 | Kao Corp | 吸収性物品用の吸収体 |
WO2011054784A1 (de) | 2009-11-06 | 2011-05-12 | Basf Se | Verbesserte superabsorber enthaltende textilien |
RU2570496C2 (ru) * | 2010-06-10 | 2015-12-10 | Као Корпорейшн | Способ изготовления поглощающего элемента |
JP2011255116A (ja) * | 2010-06-11 | 2011-12-22 | Kao Corp | 吸収性物品 |
US8969652B2 (en) * | 2010-09-21 | 2015-03-03 | The Procter & Gamble Company | Disposable absorbent article |
EP3037079B1 (en) | 2014-12-23 | 2018-07-25 | The Procter and Gamble Company | Absorbent core comprising a high loft central layer and channels |
JP6320467B2 (ja) * | 2016-07-08 | 2018-05-09 | ユニ・チャーム株式会社 | 吸収性物品 |
JP6850580B2 (ja) * | 2016-10-05 | 2021-03-31 | 花王株式会社 | 吸収性物品 |
JP6903810B1 (ja) * | 2020-12-01 | 2021-07-14 | 株式会社瑞光 | 着用物品の製造方法 |
JP6903809B1 (ja) * | 2020-12-01 | 2021-07-14 | 株式会社瑞光 | 着用物品 |
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WO1994010956A1 (en) * | 1992-11-17 | 1994-05-26 | Mölnlycke AB | A method for the manufacturing of an absorbent structure and an absorbent article comprising an absorbent structure manufactured according to this method |
US5669894A (en) * | 1994-03-29 | 1997-09-23 | The Procter & Gamble Company | Absorbent members for body fluids having good wet integrity and relatively high concentrations of hydrogel-forming absorbent polymer |
WO1998051251A1 (en) * | 1997-05-13 | 1998-11-19 | Weyerhaeuser Company | Reticulated absorbent composite |
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2000
- 2000-09-20 KR KR1020027003759A patent/KR20020035611A/ko not_active Application Discontinuation
- 2000-09-20 JP JP2001524551A patent/JP2003509162A/ja active Pending
- 2000-09-20 AU AU76149/00A patent/AU7614900A/en not_active Abandoned
- 2000-09-20 EP EP00965429A patent/EP1239800A4/en not_active Withdrawn
- 2000-09-20 CA CA002383299A patent/CA2383299A1/en not_active Abandoned
- 2000-09-20 MX MXPA02003143A patent/MXPA02003143A/es unknown
- 2000-09-20 WO PCT/US2000/026361 patent/WO2001021122A1/en not_active Application Discontinuation
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US4065832A (en) * | 1977-02-28 | 1978-01-03 | Scott Paper Company | Apparatus for forming a fibrous structure |
US4699823A (en) * | 1985-08-21 | 1987-10-13 | Kimberly-Clark Corporation | Non-layered absorbent insert having Z-directional superabsorbent concentration gradient |
US5149334A (en) * | 1990-04-02 | 1992-09-22 | The Procter & Gamble Company | Absorbent articles containing interparticle crosslinked aggregates |
US5279854A (en) * | 1992-01-27 | 1994-01-18 | Paragon Trade Brands, Inc. | Method and apparatus for zoned application of particles in fibrous material |
WO1994010956A1 (en) * | 1992-11-17 | 1994-05-26 | Mölnlycke AB | A method for the manufacturing of an absorbent structure and an absorbent article comprising an absorbent structure manufactured according to this method |
US5669894A (en) * | 1994-03-29 | 1997-09-23 | The Procter & Gamble Company | Absorbent members for body fluids having good wet integrity and relatively high concentrations of hydrogel-forming absorbent polymer |
WO1998051251A1 (en) * | 1997-05-13 | 1998-11-19 | Weyerhaeuser Company | Reticulated absorbent composite |
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See also references of WO0121122A1 * |
Also Published As
Publication number | Publication date |
---|---|
CA2383299A1 (en) | 2001-03-29 |
WO2001021122A1 (en) | 2001-03-29 |
KR20020035611A (ko) | 2002-05-11 |
JP2003509162A (ja) | 2003-03-11 |
AU7614900A (en) | 2001-04-24 |
EP1239800A1 (en) | 2002-09-18 |
MXPA02003143A (es) | 2002-09-30 |
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