WO1990011170A1 - Produit fibreux naturel revetu d'un materiau liant thermodurci - Google Patents

Produit fibreux naturel revetu d'un materiau liant thermodurci Download PDF

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Publication number
WO1990011170A1
WO1990011170A1 PCT/US1990/001505 US9001505W WO9011170A1 WO 1990011170 A1 WO1990011170 A1 WO 1990011170A1 US 9001505 W US9001505 W US 9001505W WO 9011170 A1 WO9011170 A1 WO 9011170A1
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WO
WIPO (PCT)
Prior art keywords
fibers
fiber product
product according
binder
fiber
Prior art date
Application number
PCT/US1990/001505
Other languages
English (en)
Inventor
Amar N. Neogi
Richard H. Young, Sr.
Original Assignee
Weyerhaeuser Company
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Weyerhaeuser Company filed Critical Weyerhaeuser Company
Publication of WO1990011170A1 publication Critical patent/WO1990011170A1/fr

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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
    • 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
    • D04H1/407—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 containing absorbing substances, e.g. activated carbon
    • 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
    • D04H1/413—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 containing granules other than absorbent substances
    • 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
    • D04H1/43825—Composite fibres
    • D04H1/43828—Composite fibres sheath-core
    • 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
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
    • D06M11/32—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond
    • D06M11/36—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond with oxides, hydroxides or mixed oxides; with salts derived from anions with an amphoteric element-oxygen bond
    • D06M11/46—Oxides or hydroxides of elements of Groups 4 or 14 of the Periodic Table; Titanates; Zirconates; Stannates; Plumbates
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
    • D06M11/73—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof
    • D06M11/74—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof with carbon or graphite; with carbides; with graphitic acids or their salts
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/47—Condensation polymers of aldehydes or ketones
    • D21H17/48—Condensation polymers of aldehydes or ketones with phenols
    • 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
    • A61F13/51—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 outer layers
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • 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
    • A61F2013/530007—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 being made from pulp
    • 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
    • A61F2013/530131—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 being made in fibre but being not pulp
    • 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
    • A61F2013/530131—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 being made in fibre but being not pulp
    • A61F2013/530343—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 being made in fibre but being not pulp being natural fibres
    • 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
    • A61F2013/530489—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 being randomly mixed in with other material
    • A61F2013/530496—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 being randomly mixed in with other material being fixed to fibres
    • 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
    • A61F2013/530569—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 characterized by the particle size
    • 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
    • A61F2013/530583—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 characterized by the form
    • A—HUMAN NECESSITIES
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    • A61F13/00—Bandages or dressings; Absorbent pads
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    • 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
    • A61F13/539—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 characterised by the connection of the absorbent layers with each other or with the outer layers
    • A61F2013/5395—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 characterised by the connection of the absorbent layers with each other or with the outer layers with thermoplastic agent, i.e. softened by heat

Definitions

  • the present invention relates to discontinuous natural fibers coated with thermoset binder materials and also to adhering solid particulate materials to the binder.
  • the particulate material is adhered to the fibers by the thermoset binder material as the binder material dries.
  • a number of techniques for applying binders to webs of fibers are known. For example, U.S. Patent No. 4,600,462 of Watt describes a process in which an adhesive binder is sprayed onto one or both surfaces of an air laid cellulose fiber web. Submersion of the web in the adhesive binder is another method disclosed in this patent of applying the binder.
  • U.S. Patent No. 4,584,357 of Harding discloses a latex treated cationic cellulose product and method for its manufacture.
  • cationized cellulose is treated in an aqueous suspension with an anionic polymer emulsion of from 0.1 to 30 percent on a dry weight basis.
  • the approach of the Harding patent is limited to cationic fibers.
  • the fiber coating applied as described in the Harding patent had a tendency to flake off or separate from the fibers.
  • the Harding approach uses a wet process, the lumen of the cellulose fibers is penetrated by the polymer emulsion. Since the binder on the surface of the fibers contributes principally to the desired characteristics of the fiber, any polymer that penetrates the lumen of the fiber adds little to these desired characteristics.
  • U.S. Patent No. 4,469,746 of Weisman et al. discloses fiberous webs comprised of fibers coated with a continuous film of silica. The fibers are understood to be dispersed in a charged silica aquasol to accomplish the coating. Because silica is an inorganic material, the silica does not contribute to subsequent bonding of fibers. In addition, because Weisman et al. discloses a wet process, the silica will tend to penetrate the lumen of cellulose fibers in the event such fibers are being treated in accordance with this patent.
  • patent application also describes a process in which fibers are treated with a copolymer latex, such as a combination of a paraffin wax emulsion and a styrene butadiene copolymer latex.
  • a copolymer latex such as a combination of a paraffin wax emulsion and a styrene butadiene copolymer latex.
  • the patent describes a suitable treating process as involving the blending of the aqueous latex emulsion with wood fiber in a typical mechanical wood fiber blender. This approach tends to produce fibers which are bound together by the latex.
  • U.S. Patent No. 2,757,150 of Heritage mentions a fiber treatment approach in which fibers are carried by steam under pressure and in which a thermoset resin is introduced into the fiber stream. Other materials (i.e. rosin and wax) are mentioned as being simultaneously introduced into the fiber stream.
  • thermoset resin i.e. two percent by weight phenol formaldehyde
  • the resin is in discontinuous random non-interconnected areas (blobs or globules) on the fibers.
  • These treated fibers are typically used in hardboard.
  • a phenolic resin concentration of from a maximum of five to six percent by weight is used. Even at these concentrations, the resin forms random non-interconnected globules on the fibers.
  • the uncoated resin free areas of the fibers lack the capacity to bond in comparison to the areas of the fibers covered by the resin.
  • the untreated surface areas of the fibers may lack desired characteristics of the resin covered areas of the fibers. For example, these uncoated areas may cause the fibers to be more water absorbent than if the entire fiber were coated.
  • U.S. Patent No. 4,006,887 of Engels describes a process for treating wood fibers in which the fibers are supported as an annular loose fluidized bed in a mixer which delivers glue by way of shaft mounted mixing rods to the fibers.
  • the patent mentions that the coating of fibers is useful in the manufacture of wood fiber panels.
  • the glue used in the Engels patent and the percentage of the glue that is used is not discussed.
  • German Auslegeschrift 1,048,013 as disclosing an impeller or agitator mixer for the coating of wood chips with dusty components.
  • Glue is described as being sprayed through nozzles into a mixing container.
  • An air stream is described as being blown axially through the mixing container in order to reduce the residence time of dusty chip particles to reduce excessive coating of such dusty particles.
  • German Offenlegunge 1,632,450 is mentioned by Engels as disclosing wood chips agitated in an air stream in a mixing tube in which glue spray nozzles are mounted.
  • synthetic bicomponent fibers have been formed by extruding two materials in air in side-by-side strands which are connected together along their length.
  • bicomponent fibers have also been formed with one material being extruded as a concentric sheath surrounding the other material. These extruded strands are then chopped or broken into discontinuous fibers.
  • synthetic bicomponent fibers provide good structural efficiency, they are very expensive in comparison to natural fibers, and, therefore, their use is limited.
  • U.S. Patent No. 4,261,943 of McCorsley, III describes the extrusion of filaments and the application of a solution of a nonsolvent liquid to the filaments.
  • the filaments are passed through a chamber having a nonsolvent vapor laden atmosphere, i.e. a fog of minute particles of nonsolvent. Spraying of the nonsolvent liquid onto the filaments is also mentioned.
  • the approach of the McCorsley, III patent is not understood to apply to discontinuous fibers.
  • U.S. Patent No. 4,010,308 of Wiczer describes foamed porous coated fibers. Fibers, described as organic or inorganic fibers of any character, are described as being coated with a foamable plastic material.
  • the coated fibers are made by passing continuous extruded filaments through a first bath of a ten percent polystyrene solution in toluene, evaporating the solvent, and passing the polystyrene coated fiber through a second bath containing a blowing agent, such as liquid n-pentane.
  • a blowing agent such as liquid n-pentane.
  • the treated filaments are then heated to foam the coating.
  • Rolls are used to rub solid particles into the porous surface of the foam coating.
  • Fireproofing agents, lubricants such as graphite, pigments, and insecticides are among the examples of solid materials mentioned as suitable for rubbing into the coating.
  • short lengths of cotton linters are described as being wet with a ten percent solution of a copolymer of polystyrene and acrylonitrile in about equal proportions dissolved in benzene.
  • the solvent is evaporated in an air stream and the resulting coated cotton fiber is dipped in mixed pentanes.
  • the product is then stirred in boiling water to cause foaming.
  • the product is centrifugally dried and again dried in an air stream.
  • the fiber is then mixed with a dry powder to fill the pores in the foamed coating with the powder. The placement of this fiber product in a container and heating the product to cause the adherence of the fiber surface contact points is also mentioned.
  • U.S. Patent No. 4,160,059 of Samejima describes a process in which a natural cellulose fiber (such as wood pulp fiber) is shredded and blended in air with a heat-fusible fiber. The blend is fed to a disintegrator to form supporting fibers to which an absorptive material is added. Heated air is applied to the resulting web to heat the web to a temperature above the melting point of the heat fusible fiber to form bonds between the supporting fibers and absorptive material by heat fusion.
  • Activated carbon black, Japanese acid clay, active alumina, and diatomaceous earth are mentioned as representative absorptive materials.
  • melt-blown fibers are prepared by extruding liquid fiber-forming materials into a high-velocity gaseous stream.
  • the stream of fibers is collected on a screen disposed in the stream with the fibers being collected as an entangled coherent mass.
  • Absorbent particles are introduced into the stream of fibers at the point where the fibers are solidified sufficiently that the fibers will form only a point contact with the particles.
  • the patent mentions that the particles can also be mixed with the fibers under conditions that will produce an area of contact with the particles.
  • the introduction of other fibers besides melt-blown fibers into the resulting sheet product is also mentioned.
  • surfactants in powder form can be mixed with the sorbent particles used in forming the web or surfactants in liquid form can be sprayed onto the web after it is formed.
  • U.S. Patent No. 4,392,908 of Dehnel describes a process for forming a thermoplastic adhesive resin on a surface of water soluble particles.
  • the coated particles in a dry state are heated and pressed to bond them to a dry substrate (i.e. cellulose fluff) .
  • a dry substrate i.e. cellulose fluff
  • Milling of the particles after coating with thermoplastic is mentioned as usually being necessary to produce free flowing particles.
  • the Dehnel patent illustrates another approach for heat fusing particles to fibers.
  • discontinuous natural fibers have a thermoset binder coating thereon in an amount which is sufficient to produce bicomponent fibers having a substantially continuous layer of the binder material on their surface. A substantial majority of the resulting bicomponent fibers are unbonded.
  • the fibers may be subsequently heated to cure the binder and fuse them together.
  • the fibers may also be combined with other nontreated fibers and heat fused to provide a bonded web.
  • the fibers may have substantial amounts of binder material, yet still comprise individualized coated fibers. It has been found that the thermoset binder material must be included in an amount of at least about seven percent of the combined dry weight of the binder material and fibers in order to produce a substantially continuous binder coating on the fibers. With a substantially continuous coating, little or no surface area of the fibers is exposed and the desired characteristics added to the fibers by the binder material are not nullified or significantly altered by uncoated areas of the fiber. With a thermoset binder level of at least about 10 percent of the combined dry weight of the binder material and fibers, the coated fibers are capable of bonding relatively strongly to one another when heat fused.
  • thermoset binder levels of 30 percent to 50 percent and higher, such as above 90 percent and with no maximum limit yet being determined, are included in the invention, while still resulting in a product comprised of substantially unbonded individualized fibers.
  • the treated fibers may readily be mixed or blended with untreated fibers and used in heat fusing the blended fibers.
  • higher binder levels are preferably used to adhere solid particulate materials to the fibers as explained below.
  • the fiber product may include one or more solid particulate materials adhered to the fibers by the thermoset binder material. Solid particulate material is applied to the fibers while the liquid binder material on the fibers is still at least partially wet. As the liquid binder material dries, the particulate material is adhered to the fibers.
  • the particulate materials may comprise at least one material selected from the group comprising a pigment material, a super absorbent material, an abrasive material, an oleophilic material, an electrically conductive material and a fire retardant material.
  • more than one binder material may be applied to the fibers, such as a thermoset binder material followed by a thermoplastic binder material, with or without solid particulate material being adhered to the fibers by the binder.
  • a thermoset binder material followed by a thermoplastic binder material
  • substantially individualized fibers containing these plural binder materials can be produced in accordance with the method.
  • the fiber product may comprise cellulose fiber bundles.
  • a fiber bundle is an interconnected group of two or more fibers that are not separated during processing. Fiber bundles, like individual fibers are much longer than wide. For example, when mechanically fiberized wood is produced, some individual fibers result along with fiber bundles of fibers that are not separated during the mechanical fiberization process. It is accordingly one object of the present invention to provide discontinuous natural fibers coated with a thermoset binder material.
  • thermoset binder coated fibers which are substantially individualized or unbonded.
  • a further object of the present invention is to provide thermoset binder coated discontinuous natural fibers with the binder being present in an amount which is sufficient to substantially continuously coat the fibers, or in much higher amounts, with the fibers being substantially individualized or unbonded.
  • a still further object of the present invention is to provide thermoset binder coated fibers having one or more solid particulate materials, which impart functional benefits to the fibers, adhered to the fibers by the binder material.
  • Another object of the present invention is to provide substantially individualized discontinuous thermoset binder coated fibers, with or without particulate materials adhered thereto, for use in the manufacture of articles by heat curing the binder on the fibers, with or without additional untreated fibers being added.
  • a further object of the invention is to form an air laid web directly with dried coated fibers and with partially wet coated fibers.
  • Fig. 1 is a schematic illustration of one form of apparatus in which discontinuous fibers can be treated in accordance with the method of the present invention.
  • Fig. 2 is a side elevational section view of one form of binder application mechanism which can be used to apply liquid binder material to discontinuous fibers in accordance with the method of the present invention.
  • Fig. 3 is a front elevational section view of the binder application mechanism of Fig. 2.
  • Fig. 4 is a schematic illustration of another form of binder application mechanism which can be used to produce the fiber product of the present invention.
  • Fig. 5 is a schematic illustration of an alternative apparatus used in producing the fiber product of the present invention.
  • Fig. 6 is a schematic illustration of another apparatus for producing the fiber product of the present invention.
  • the present invention is a fiber product comprised of treated discontinuous natural fibers.
  • natural fibers refers to fibers which are naturally occurring, as opposed to synthetic fibers. Noncellulosic natural fibers are included, with chopped silk fibers being one example.
  • natural fibers includes cellulosic fibers such as wood pulp, bagasse, hemp, jute, rice, wheat, bamboo, corn, sisal, cotton, flax, kenaf, and the like, and mixtures thereof.
  • the term discontinuous fibers refers to fibers of a relatively short length in comparison to continuous fibers treated during an extrusion process used to produce such fibers.
  • discontinuous fibers also includes fiber bundles.
  • individual fibers refers to fibers that are comprised substantially of individual separated fibers with at most only a small amount of fiber bundles.
  • Wood pulp fibers can be obtained from well-known chemical processes such as the kraft and sulfite processes. Suitable starting materials for these processes include hardwood and softwood species, such as alder, pine, douglas fir, spruce and hemlock. Wood pulp fibers can also be obtained from mechanical processes, such as ground wood, refiner mechanical, thermomechanical, chemi-mechanical, and chemi-thermomechanical pulp processes. However, to the extent such processes produce fiber bundles as opposed to individually separated fibers or individual fibers, they are less preferred. However, treated fiber bundles is within the scope of the present invention. Recycled or secondary wood pulp fibers and bleached and unbleached wood pulp fibers can also be used. Details of the production of wood pulp fibers are well-known to those skilled in the art. These fibers are commercially available from a number of companies, including Weyerhaeuser Company, the assignee of the present patent application.
  • thermoset binder treated chemical wood pulp fibers Individual treated fibers of other types, and obtained by other methods, as well as treated fiber bundles, can be obtained in the same manner.
  • relatively dry wood pulp fibers that is fibers with less than about 10 to 12 percent by weight moisture content
  • the lumen of such fibers is substantially collapsed.
  • binder materials in particular thermoset resin or latex binder materials
  • relatively wet fibers tend to have open lumen through which binder materials can flow into the fiber in the event the fiber is immersed in the binder.
  • any binder that penetrates the lumen contributes less to the desired characteristics of the treated fiber than the binder which is present on the surface of the fiber. Therefore, when relatively dry wood pulp fibers are treated, less binder material is required to obtain the same effect than in the case where the fibers are relatively wet and the binder penetrates the lumen.
  • Thermoset binder materials used in producing the fibers typically include substances which can be applied in liquid form to entrained fibers during one illustrated treatment process. These binder materials are capable of subsequently binding the fibers produced by the process to one another or to other fibers during the manufacture of webs and other products using the treated fibers. Most preferably, these thermoset binders comprise organic polymer materials which may be heat cured at elevated temperatures to bond the fibers when the fibers are used in manufacturing products. Also, in applications where solid particulate material is to be adhered to the fibers by the thermoset binder, the binder must be of a type which is suitable for this purpose.
  • thermoset binders include polymeric materials in the form of aqueous emulsions or solutions and nonaqueous solutions.
  • the total liquid content of the treated fibers during treatment including the moisture contributed by the binder, together with the liquid content of the fibers (in the case of moisture containing fibers such as wood pulp) , must be no more than about 45 to 55 percent of the total weight, with a 25 to 35 percent moisture content being more typical.
  • the moisture contributed by the wood pulp can be higher, but is preferably less than about 10 to 12 percent and more typically about six to eight percent. The remaining moisture or liquid is typically contributed by the binder.
  • latexes These polymer emulsions are typically referred to as "latexes.”
  • latex refers very broadly to any aqueous emulsion of a thermoset polymeric material.
  • solution means thermoset binders dissolved in water or other solvents, such as acetone or toluene.
  • Polymeric materials used in binders in accordance with the present method can range from hard rigid types to those which are soft and rubbery.
  • thermoset binders can be made of the following materials: epoxy phenolic bismaleimide polyimide melamine/formaldehyde polyester urethanes urea urea/formaldehyde As explained more fully below, in accordance with the method of the present invention, more than one of these materials may be used to treat the discontinuous fibers. Also, a thermoset binder material may be used and followed by a thermoplastic material.
  • examples include: ethylene vinyl alcohol, polyvinyl acetate, acrylic, polyvinyl acetate aerylate, acrylates, polyvinyl dichloride, ethylene vinyl acetate, ethylene vinyl chloride, polyvinyl chloride, styrene, styrene aerylate, styrene/butadiene, styrene/acrylonitrile, acrylonitrile/butadiene/styrene, ethylene acrylic acid, polyethylene, urethanes, polycarbonate, polyphenylene oxide, polypropylene, polyesters, polyimides.
  • the thermoplastic material may be heated to its softening or tack temperature without raising the thermoset material to its curing temperature.
  • the remaining thermoset material permits subsequent heating of the fibers to cure the thermoset material during further processing.
  • the thermoset material may be cured at the same time the thermoplastic material is heated by heating the fibers the curing temperature of the thermoset material with the thermoplastic material also being heated to its tack temperature.
  • Certain types of binders enhance the fire resistance of the treated fibers, and thereby of products made from these fibers. For example, poly vinyl chloride, poly vinyl dichloride, ethylene vinyl chloride and phenolic are fire retardant.
  • Surfactants and other materials may also be included in the liquid binder as desired.
  • pigments may be included in the binder.
  • the fiber product of the invention may have one or more solid particulate materials adhered to the fibers to provide desired functional characteristics.
  • the solid particulate materials are applied to a binder wetted surface of the fibers and are then adhered to the fibers by the binder as the binder dries. In this case, heat curing of the binder is not used to adhere the particles to the fibers.
  • suitable particulate materials include pigments, such as titanium dioxide; fire retardant materials, such as alumina trihydrate and antimony oxide; electrically conductive materials, such as metallic powders and carbon black; abrasive materials, such as ceramics, grit and metallic powders; acidular materials, such as clay, talc and mica, used as paper making additives; oleophilic materials; hydrophobic materials; and hydrophilic materials, such as super absorbent particles; insecticides; and fertilizers.
  • the solid particulate materials are not limited to narrow categories.
  • the super absorbent particulate materials are granular or powdered materials which have the ability to absorb liquids, including body fluids. These super absorbents are generally hydrophilic polymeric materials. Super absorbents are defined herein as materials which exhibit the ability to absorb large quantities of liquids, i.e. in excess of 10 to 15 parts of liquid per part thereof. These super absorbent materials generally fall into three classes, namely, starch graft copolymers, cross-linked carboxymethylcellulose derivatives and modified hydrophilic polyacrylates.
  • super absorbents include carboxylated cellulose, hydrolyzed aerylonitrile-grafted starch, acrylic acid derivative polymers, polyacrylonitrile derivatives, polyacrylamide type compounds and saponified vinyl acetate/methyl acrylate copolymers.
  • Specific examples of super absorbent particles are marketed under the trademarks "Sanwet” (supplied by Sanyo Kasei Kogyo Kabushiki Kaisha) and "Sumika Gel” (supplied by Sumitomo Kagaku Kabushiki Kaisha) .
  • An abrasive is a hard substance that, in particulate form, is capable of effecting a physical change in a surface, ranging from the removal of a thin film of tarnish to the cutting of heavy metal cross sections and cutting stone.
  • Abrasives are used in scores of different abrasive products.
  • the two principal categories of abrasives are: (1) natural abrasives, such as quartz, emery, corundum, garnet, tripoli, diatomaceous earth (diatomite), pumice, and diamond; and (2) synthetic abrasives, such as fused alumina, silicon carbide, boron nitride, metallic abrasives, and synthetic diamond.
  • Oleophilic materials are those capable of rapid wetting by oil while hydrophilic materials are those capable of rapid wetting by water.
  • Pigments or colorants can be broadly defined as being capable of reemitting light of certain wavelengths while absorbing light of other wavelengths and which are used to impart color.
  • Electrically conductive materials are those which readily conduct electric current.
  • fire retardant materials are those which reduce the flammability of the fibers to which they are attached.
  • these materials are active fire retardants in that they chemically inhibit oxidation or they emit water or other fire suppressing substances when burned.
  • a sheet of chemical wood pulp 10 is unrolled from a roll 12 and delivered to a refiberizing apparatus, such as a conventional hammer mill 14.
  • the sheet 10 is readily converted into individual fibers 16 within the hammer mill.
  • These individual fibers are delivered, as by a conveyor 18, to a fiber loading zone 20 of a fiber treatment apparatus.
  • fibers 16 are continuously delivered to the zone 20.
  • fibers are loaded at zone 20 at intervals.
  • loading zone 20 forms part of a fiber treatment conduit 24.
  • the illustrated conduit 24 comprises a recirculating loop.
  • a blower or fan 26 in loop 24 is positioned adjacent to the fiber loading zone 20.
  • Blower 26 is capable of moving a gaseous medium, such as air, at a velocity and volume sufficient to entrain the fibers which have been loaded into zone 20.
  • the entrained fibers circulate in a direction indicated by arrow 28 through the loop and pass through the loading zone 20 and blower 26 each time the loop is traversed.
  • the velocity of air traveling in the loop is preferably set at a level where solids are uniformly dispersed and transported by the air flow.
  • the velocity is preferably established at a level which is sufficient to avoid saltation, that is the dropping of solids or liquids from a horizontal air stream.
  • a velocity of 5,000 feet per minute would be suitable for treatment of these fibers.
  • this velocity can be varied and adjusted for optimum results.
  • the ratio of the volume of air per pound of entrained fiber is variable over relatively large ranges.
  • One suitable example would be 23.4 ft 3 of air per pound of fiber.
  • Another suitable example would be 11.7 ft 3 of air per pound of fiber.
  • the entrained fibers traveling in the loop pass one or more binder material application zones, with one such zone being indicated in Fig. 1 at 30.
  • This binder material application zone 30 forms a part of the conduit 24.
  • a mechanism is provided at the binder application zone for applying a liquid binder solution to the entrained fibers.
  • plural nozzles in this case nozzles 32, 34 and 36, are used to apply the liquid binder material. These nozzles produce an atomized spray or mist of binder drops which impact and coat the fibers as the fibers pass the nozzles.
  • plural valves 40, 42 and 44 are operated to control the flow of liquid binder material to the respective nozzles 32, 34 and 36.
  • a first liquid binder material from a tank or other source 46 is delivered to the three nozzles 32, 34 and 36 when valves 40 and 42 are open and valve 44 is closed.
  • an additional amount of the first liquid binder material is applied. Different surfaces of the fibers are exposed to the nozzles 32, 34 and 36 as the fibers travel through the material application zone 30.
  • the valve 40 is closed.
  • a second liquid binder material from a tank or other source 48 may also be applied to the fibers.
  • this second liquid binder material is applied to the fibers through each of the nozzles 32, 34 and 36.
  • the two liquid binder materials may be simultaneously applied, at successive locations in zone 30.
  • the valve 42 may be closed and valve 44 opened so that the first liquid binder material is applied through nozzles 32, 34 and the second liquid binder material is applied through nozzle 36.
  • More than two types of liquid binder materials may be applied by adding additional binder sources and suitable valving and nozzles.
  • the material application zone 30 typically ranges from two to one hundred feet long, with longer application zones allowing the application of binder over a longer period of time during passage of fibers through the material application zone. Also, longer material application zones facilitate the use of more nozzles spaced along the length of the zones.
  • the nozzles 32, 34 and 36 are commercially available and produce a fine mist of droplets. Typically, these nozzles provide a fan spray. Any suitable nozzles may be used, but it is desirable that the nozzles not produce a continuous stream of liquid binder material, but instead produce droplets or a mist of such material.
  • the nozzles are typically spaced apart from three to four feet along the length of the conduit, although they may be closer or further apart as desired.
  • thermoset binder any amount of binder material may be applied to the entrained fibers.
  • the application of the thermoset binder must be at a minimum of about seven percent of the dry weight of the combined fibers and binder in order for the fibers to have a substantially continuous sheath or coating of the binder material. If the fibers lack a continuous coating, it would become more difficult to adhere significant amounts of particulate material to the binder in the manner explained below. In fact, a much higher percentage of binder than this minimum would preferably be used to adhere particles to the fibers. Also, exposed portions of the core fiber, that is surface areas of the fiber not coated with the binder, lack the desired characteristics of the binder.
  • thermoset binder For example, if a hydrophobic thermoset binder is used to cover a water absorbing cellulose material, failure to completely enclose the material with the coating leaves exposed surfaces of the fiber which can absorb water. Also, any uncoated areas on the fibers would not bond to other untreated fibers during subsequent heat bonding of the treated and untreated fibers.
  • thermoset binder concentration of about 10 percent by dry weight of the weight of the fiber and binder combination
  • the fibers when heat fused, will bond somewhat strongly to other fibers coated in a similar manner, but less strongly to untreated fibers.
  • the resulting bond strength would be similar to the strength achieved when fibers coated with a 40 percent by dry weight binder amount are mixed with untreated fibers in a ratio of one part treated fibers to three parts untreated fibers.
  • a thermoset binder concentration by dry weight of the combined binder and fibers of from 30 percent to 50 percent would be particularly suitable for use in mixing with other fibers, heat bonding, and use in forming products such as absorbent pads.
  • Thermoset binder concentrations in excess of 50 percent, for example 90 percent or more, can be achieved utilizing the present invention.
  • one preferred approach is to apply a first amount of the binder material to the entrained fibers, continue to recirculate the fibers until this first layer or coating of binder material is substantially dry, and then apply a second coating of the binder material.
  • Third, fourth and subsequent coatings can be applied to the entrained fibers as necessary to achieve the desired level of binder material.
  • the fibers may be retained in the loop until they have dried. The recirculation of the fibers may then be stopped and the fibers removed at the loading zone 20 which then functions as a fiber removal location.
  • a cyclone separator 60 is selectively connected by a conduit section 61 and a gate valve 62 to the conduit 24.
  • a valve 64 is opened to allow air to enter the loop 24 to compensate for air exiting through the separator 60.
  • the entrained fibers are collected in the separator and then removed from the separator at a fiber removal outlet 66.
  • a substantial majority of the fibers processed in this manner are unbonded to one another by the binder material.
  • substantial majority it is meant that at least about 70 percent of the fibers remain unbonded. More specifically, in tests conducted as of this time, the resulting treated fibers are substantially unbonded, meaning that approximately 95 percent of the treated fibers have been found to be unbonded to one another by the binder material.
  • An optional means for heating the binder coated fibers may be included in conduit 24.
  • heated air may be blended with the air flowing through the conduit.
  • a heater 70 may be included in conduit 24 for heating the fibers. This added heat accelerates the drying of the liquid binder.
  • the fiber temperature is preferably maintained below the curing temperature of the thermoset binder so that the binder coated fibers may be subsequently heat cured during the processing of the binder coated fibers into products.
  • the fibers are preferably not heated prior to the application of the thermoset binder material. Heating the fibers would result in elevated temperatures at the binder application zone 30. These elevated temperatures would cause some of the binder to at least partially dry (coelesce) before reaching surfaces of fibers passing through the binder application zone 30. The solidified binder would then tend to not adhere, or only adhere weakly to the fibers. In addition, droplets of binder which impinge heated fibers would tend to dry in globules on the fibers, rather than spread across the surface of the fibers to provide a substantially continuous uniform coating thereon.
  • the dried fibers from outlet 66 of the cyclone separator 60 may be deposited in a conventional baling apparatus 72.
  • the fibers are at a temperature which is below their curing or tack temperature under the pressure applied by the baler. When compressed, these fibers remain unbonded by the binder material and therefore can be readily separated into individualized fibers for subsequent use.
  • treated fibers which have only been partially dried, and thus which are still somewhat wet with the thermoset binder material may be deposited from outlet 66 loosely onto a conveyor 74 or in a loose uncompressed pile at a collecting zone (not shown) . These fibers can then be allowed to dry.
  • the treated fibers may be carried by the conveyor 74 through a heater 76, operable like heater 70, to accelerate the drying of the fibers.
  • the resulting product again contains a major portion of unbonded fibers. However, the wetter the fibers and more dense the resulting web when deposited on belt 74, or in a pile, the more binder-to-binder bonds that occur.
  • the fiber may be air laid either dry or wet, that is with no more than about a 55 percent total moisture content in the fibers and binder therein, directly into a web which can then be processed into various products, such as into disposable diapers with the core of the diaper being formed by the web.
  • Air laying refers to the transfer of the fibers through air or another gaseous medium.
  • Solid particulate materials such as super absorbent particles and other materials, may be adhered to the fibers by the binder material.
  • the solid particulate material is added to the loop 24, such as at the fiber loading zone 20.
  • the particles may also be added to the loop 24 from a supply housing 80, using a feed screw metering device or other conventional injection mechanism.
  • the particles are added after the fibers have been wetted with the binder material. Consequently, the particles will not be covered with the binder material, which could interfere with the desired attributes contributed by the particles. These particles contact the wet binder material on the surfaces of the fibers and stick to the binder material. As the binder material dries, the particles remain stuck to the surface of the treated fibers.
  • the fibers can be treated with a binder, circulation of the fibers stopped momentarily to allow the addition of the solid particulate material at the fiber loading zone 20, and recirculation and entrainment of the fibers recommenced.
  • the particles would mix with and be secured to the surface of the fibers by the liquid binder material as the binder dries.
  • relatively high levels of thermoset binder concentrations for example 20 percent or more of the dry weight of the binder, fiber and additive, would produce the best adhesion of particles to the fibers.
  • a 50 percent binder concentration is expected to perform better in adhering particles to the fibers than a 20 percent binder concentration in many applications.
  • the Fig. 1 apparatus may be operated in a batch mode in which fibers are introduced, fully treated and removed. Alternatively, a semi-batch approach may be used in which fibers are added and some, but not all, of the fibers removed from the loop. Also, the Fig. 1 apparatus may be operated in a continuous mode in which fibers are introduced at zone 20 and removed by the cyclone separator 60 with or without recirculating through the loop. The gate valves 62, 64 may be opened to a desired extent to control the amount of fiber that is removed. This quantity of removed fiber is preferably equal to the amount of untreated fiber that is introduced into the loop. In this nonrecirculating case, the zone 30 is typically expanded.
  • FIGs. 2 and 3 another mechanism for applying binder material to the fibers is illustrated. Rather than using external spray nozzles such as 32, 34 and 36, plural nozzles (i.e., one being shown as 82 in Figs. 2 and 3) are included in the conduit at the binder material applying zone 30.
  • the nozzle 82 applies a fine spray of liquid binder material onto the fibers 16 as they move past the nozzle.
  • the Figs. 2 and 3 binder applying mechanism includes a means for imparting turbulence to the air as it passes the nozzles. As a result, the fibers 16 tend to tumble in front of the nozzles and expose different surfaces to the applied binder material.
  • the illustrated turbulence imparting mechanism comprises a blunted conical air deflection baffle 86 supported within the conduit 24 by rods, with two such rods 88 and 90 being shown.
  • Rod 90 may be hollow to provide a pathway through which binder material is delivered to the nozzle 82.
  • other turbulence imparting mechanisms may also be used.
  • a rotary mixer 90 with plural mixing paddles, some being indicated at 92, is disposed within the conduit 24 at the material applying zone 30.
  • This mixer is rotated by a motor (not shown) to impart turbulence to fibers as they pass the mixer paddles.
  • the nozzles 32, 34 and 36 are disposed externally of the conduit 24 for directing the binder material through ports to the fibers passing the mixer. These nozzles may be enclosed in a shroud or cover as shown by dashed lines 94 in this figure.
  • blower 26 has been shifted to a location downstream from the material applying zone 30.
  • the material applying zone is at a relatively low pressure with a slight vacuum being present in the material applying zone relative to the pressure outside the conduit at this zone. Consequently, fibers passing the nozzles 32, 34 and 36 tend to be drawn into the conduit rather than escaping through the binder applying ports. As a result, the nozzles can be positioned outside of the conduit where they are not subject to being clogged by the passing fibers.
  • FIG. 5 another apparatus is shown for producing the fiber product of the present invention.
  • elements in common with those of Fig. 1 have been given like numbers and will not be discussed in detail.
  • the Fig. 5 form of the apparatus allows the continuous processing of fibers with the fibers passing only once through the binder material application zone 30.
  • the zone 30 is typically of an extended length with more nozzles (i.e. six to twelve or more) than shown in Fig. 5.
  • solid particulate material may be added from source 80, such as by a blower (not shown) or a feed screw, to introduce the particles into the stream of entrained fibers.
  • the fibers pass through a heater or oven 70, or heated air is blended with the air stream which entrains the fibers, for drying purposes and then travel through a distance D at the elevated temperatures created by this heat.
  • D may be 150 feet with the time required to travel the distance D enabling the binder on the entrained fibers to become substantially dry.
  • cooling air from a refrigeration unit 100 or ambient air from the environment may be delivered by a blower 102 to the conduit 24 at a location 104 in the conduit. This cooling air lowers the temperature of the dried and treated fibers.
  • the cooling air may be dehumidified prior to introduction to conduit 24 to minimize any condensation that may otherwise occur in the conduit.
  • the added heat does not elevate the temperature of the fibers to a level which cures the thermosetting binder. Consequently, the binders may subsequently be heat cured when the treated fibers are thereafter used in manufacturing.
  • Cyclone separator 60 may be provided with a bleed line 106 for venting the air during separation. Although less preferred, this air may be recirculated back to the fiber loading zone 20.
  • Flow control gate valves 107, 109 may be included in the system to balance the air flow through the various conduits of the illustrated system.
  • the treated fibers from outlet 66 of the separator 60 may be fed to a hopper 110 of a conventional fiber blending unit 112.
  • Other fibers such as wood pulp fibers or synthetic fibers may be fed, in a desired proportion for the resulting product, by way of a conduit 114 to another hopper 116 and then to the blending unit 112.
  • the fibers from outlet 66 can lso be used without blending them with other fibers.
  • the blended treated and untreated fibers 118 are shown being deposited on a facing sheet 120 which is passed through the blending unit 112 from a roll 122.
  • the fibers may also be deposited directly on a conveyor without a facing sheet.
  • the facing sheet is carried by a conveyer 124 through the blending unit 112.
  • the composite web is then passed through a thermobonding unit 130 which raises the temperature of the fibers sufficiently to cause the treated fibers to heat fuse to the other fibers and to the facing sheet.
  • the fibers may be compressed to densify the web prior to or after delivery to the thermobonder 130.
  • a cover sheet may also be added to the product before or after the thermobonder 130.
  • they may be "tenderized” by the use of a mechanism which mechanically breaks up some of the bonds in the web.
  • the web still remains substantially bonded, however.
  • the webs may be passed through the nips of cross machine direction and machine direction corrugators to reduce their stiffness. The stiffness can be controlled by adjusting the clearance between the nips.
  • the fibers to be treated may be delivered in loose form or in the form of a sheet 10 from roll 12 to a first hammer mill or refiberizing device 140.
  • the resulting fibers travel through air or another gaseous medium in conduit 24 and through a binder applying zone 30. If the fibers are not conveyed horizontally but merely pass downwardly in the conduit, the air velocity need not be as high. In this sense the fibers are not air entrained, but merely travel through the conduit.
  • a first binder material 46 is applied to the fibers by way of nozzle 32.
  • the material applying zone is substantially elongated over that which is shown.
  • One or more particulate materials may also be added to the binder coated fibers from a source of such particles 80.
  • the treated fibers may be air laid or otherwise deposited directly, wet or dry, on a face sheet 120 from a roll 122 or directly on a conveyor.
  • a vacuum (not shown) would be used to draw the fibers against the screen so that the fibers are not simply falling under the influence of gravity.
  • the face sheet can be carried by a conveyor 124 past an outlet 146 of the fiber treatment apparatus.
  • a web of untreated fibers 148 from a roll 150 is optionally delivered to another hammer mill 152 for fiberization and blending with the treated fibers prior to depositing the blend on the face sheet 120.
  • the face sheet 120 and deposited fibers may then be processed, such as previously described, for use in manufacturing a variety of products.
  • a bleached Kraft Southern Pine cellulose fiber pulp sheet (NB-316 from Weyerhaeuser Company) can be fiberized in a hammer mill. One kilogram of the fiberized fluff can then be air entrained in a recirculating conduit 24. After 20 seconds of air entrainment, a mixture of 250 grams polymeric methylene diisocyanate (PMDI) resin, such as PAPI 2027 from Dow Chemical Corporation and 250 grams of propylene carbonate, such as from Arco Corporation can be sprayed onto the air entrained fiber over a period of three minutes. The coated fiber can be recirculated for two minutes prior to separation in a cyclone.
  • PMDI polymeric methylene diisocyanate
  • the still somewhat wet coated fiber can then be deposited in a loose pile and air dried at room temperature for 24 hours. Even though wood fibers are of irregular cross-section and thus more difficult to coat than surfaces with a regular cross section or smooth surface, the resultant fibers would have a uniform continuous coating of binder. Also, approximately 95 percent of the fibers would be unbonded to one another by the binder material. The dried fiber can then easily be air laid in a laboratory pad former. The tensile index of those pads (tensile strength in N/m divided by basis weight g/m 2 ) would be much higher than the case of pads of untreated fibers processed in the same manner but without the thermoset binder material.
  • thermoset coating Cellulose fibers having 5 percent, 7 percent, 10 percent, 20 percent, 30 percent, 50 percent and higher, by dry weight, thermoset coating can be manufactured in this manner. It is only at levels of about 7 percent that a continuous coating of the fibers has been observed. At 5 percent, the binder material would be present as non-interconnected areas or blobs on the surface of the fibers. These percentages are the percent of dry weight of the fiber and binder combination which is the binder. In a recirculating system, to achieve higher percentages of the binder concentration, the fibers can be recirculated in the loop and through the binder application zones during liquid binder application for a longer time. Substantially unbonded individualized fibers coated with a substantially continuous coating of thermoset binder material can be produced in accordance with this approach.
  • thermoset binders are not limited to specific thermoset binders.
  • Cascophen WC04 from Borden Chemical Corporation is another specific example, in this case of a phenolic resin.
  • Still another example of a specific thermoset resin is Chembond 2509 from Chembond, Inc.
  • EXAMPLE 2 This example is similar to Example 1, with the exception that a larger volume of fibers can be treated at one time.
  • a surfactant material can be added to the thermoset resin for application with the binder.
  • dioctyl sodium sulfosuccinate would be a suitable surfactant material.
  • a four kilogram batch of treated NB-316 fluff can be processed as explained in Example 1 with PMDI resin being used as the binder.
  • Sufficient resin can be added to generate a mixture that is 80 percent NB-316 wood pulp fibers, 20 percent resin with two percent surfactant based on the resin.
  • the treated fibers can be recirculated in the loop for 15 seconds following the application of the last of the resin and then dumped in a pile for subsequent drying. Substantially unbonded individualized fibers are expected to result.
  • thermoset binder coated fibers A binder concentration of 7 percent is expected to adhere some particulate material to the fibers, but at binder concentrations of 20 percent of the total dry weight of the binder, fiber and additives, and higher, much better adhesion would occur.
  • Fibers can be produced in a recirculating loop of the form shown in Fig. 1. In processing the fibers, a sufficient amount of thermoset binder material can be added to the air entrained fibers to produce the desired concentration. The recirculation blower can be momentarily turned off and the particulate material added to the system at the fiber loading zone 20. Recirculation of the materials through the loop can then be recommenced to mix the particles with the still wet and entrained fibers. Continued circulation of the fibers would cause a partial drying of the binder and adhesion of the particles to the fibers.
  • fibers coated with 20 percent phenolic resin, such as Cascophen WC04, (the percentage being the percent of binder in the dry fiber, binder and pigment combination) can be mixed with a granular pigment material, specifically titanium dioxide.
  • titanium dioxide can be added to the fibers, including an amount which is sufficient to be 50 percent of the dry weight of the binder, fiber and titanium dioxide combination. This material would be useful in paper making processes.
  • fire retardant particulate materials such as alumina trihydrate and antimony oxide may be adhered to binder treated fibers for use in preparing fire retardant materials, such as pads, paper and other products.
  • a conductive particulate material (such as 60-80 percent by weight of the binder fiber and additive combination) may be adhered to the fibers by the binder.
  • Powdered metallic materials and carbon black are examples.
  • thermoset binder material For use in manufacturing abrasive pads and the like, abrasive particulate materials, such as ceramic powders, metallic powders, or grit, may be secured to the fibers by the thermoset binder material.
  • paper making additives such as acidular particles of clay, talc, mica and so forth, may be adhered to the fibers.
  • paper making additives such as acidular particles of clay, talc, mica and so forth, may be adhered to the fibers.
  • approximately 50 percent by weight of the binder, fiber and additive content may be made up of these additives.
  • Oleophilic materials such as polynorbornene in a desired concentration may be adhered to the fibers.
  • a fugitive surfactant is used in this case.
  • these materials may be added in varying percentages.
  • more than one type of particle may be bound to the fibers if the functional characteristics of more than one particulate material are desired.
  • the binder is of a polymeric heat bondable thermoset type so that the fibers may be subsequently heat bonded, with or without other fibers, in manufacturing a product.
  • EXAMPLE 4 This example is like Example 3, except that super absorbent particles are adhered to the fibers by the binder material. These super absorbent particles are well known in the art. Various amounts of super absorbent particles can be adhered to the fibers, including from 15-50 percent of the dry weight of the resultant fiber, binder and additive combination. Lower percentages are also possible as are higher percentages.
  • a specific example of super absorbent particulate material is Sanwet 1M-1000, available from Celanese Corporation. Other materials may be added to the binder. In one more specific example, rather than stopping the fibers to permit addition of the particulate material, super absorbent particles can be fed into the air stream containing the entrained fibers immediately following the binder application zone.
  • the resultant material would have fiber bonded to the super absorbent particles so as to contain the super absorbent particles in the resultant fluff. Yet, the fibers which are not attached to the particles would substantially be unbonded to one another.
  • the dried fluff can then be air laid into a web and thermobonded.
  • the web prepared in this manner is expected to have an absorbency which is equivalent to an unbonded product, but with virtually 100 percent containment of the super absorbent particles.
  • the containment of the super absorbent particles within the fibers prior to thermobonding would be excellent.
  • a very uniform distribution of super absorbent particles can be achieved in the resulting web and would enhance the water absorbing characteristics of the web. Consequently, the fibers can be stored and transported for subsequent use in products without significant loss or migration of super absorbent particles.
  • thermoset binder can be mixed with a blowing agent, such as Azodicarbonamid, and applied to the entrained fibers. When the fibers are subsequently heated, nitrogen, carbon dioxide and/or other gases would be released to produce a foamed coating of the fibers. These foam coated fibers can then be used in manufacturing, such as in the manufacturing of insulated paper board.
  • a blowing agent such as Azodicarbonamid
  • thermoset binder may be a hydrophobic latex material with a fugitive surfactant with the particles hydrophobic or the binder may be of a hydrophobic material with the particles hydrophilic.
  • a fugitive surfactant is typically used when water based binders are used and the fibers or particles are hydrophobic.
  • PMDI resin such as PAPI 2027
  • PAPI 2027 may be used and applied as explained in connection with Example 1, as a hydrophobic binder. While PMDI resin does have a tendency to absorb oil to a limited extent, it is not an optimum oil absorbing material.
  • thermoset binder material By attaching polynorbornene particles to the fibers by the thermoset binder material, fibers having an enhanced capacity for oil absorption may be produced as the polynorbornene in effect acts like a super absorbent for oil.
  • hydrophobic binder with a hydrophilic particulate material would be fibers coated with PMDI resin with super absorbent particles adhered to the fibers by the binder.
  • fibers containing a 20 percent PMDI thermoset binder, 40 percent by weight super absorbent particles, and 40 percent by weight fiber can be produced. These percentages would be of the total dry weight of the binder, fiber and additive combination.
  • the fibers may be coated with plural binder materials.
  • the first binder material may be a thermoset binder material, such as phenolic resin, which can be applied to the fibers to increase their strength and rigidity.
  • Cascophen WC04 is an example of such a resin.
  • This binder can be applied using the apparatus of Fig. l, Fig. 5 or Fig. 6 as previously described.
  • a second thermoplastic binder such as
  • Primacor 4990 ethylene acrylic and copolymer solution
  • Primacor is a hydrophobic, somewhat oleophilic, thermoplastic binder available from Dow Chemical Corporation.
  • This second coating can be used to bond particulate materials to the fibers that would not satisfactorily bond to a thermoset coating.
  • they may be heated to the hot tack temperature of the outer binder coating for purposes of heat fusing the fibers.
  • the thermoset coating withstands higher temperatures, its integrity as a fiber and contribution to the strength of the bicomponent fiber remains.
  • fibers having plural desired characteristics such as a water repellant undercoating and a highly bondable outer coating, can be produced, with or without adhered particulate materials.
  • Kraton a styrene butadiene block copolymer, available from Shell Chemical Corporation is an example of another hydrophobic and oleophilic binder material. This material does not form very strong bonds with other fibers. Therefore, a highly bondable first coating, such as of phenolic resin may be applied to continuously coat the fibers. Kraton in a lesser amount may then be applied to only partially coat the fibers. The exposed phenolic resin coated areas then enhance the bondability of these fibers.
  • thermoset binders may be used.
  • the fiber core may be coated with a phenolic resin, such as Cascophen WC04, as a first thermoset binder.
  • This first thermoset binder has a curing temperature of about 175°C.
  • the first thermoset binder may then be coated with a second thermoset binder, such as Cascores C65 WK from Borden Chemical Corporation.
  • the second binder may be applied at a relatively low percentage, such as less than 7 percent by dry weight of the fibers and binder.
  • the second binder may be heat cured at a first temperature (i.e. 100°C in this example) during initial use of the fibers; for example, to bond the fibers with other fibers to form a web. With the first temperature below the curing temperature of the first binder, the integrity of the first binder coating is maintained during this preliminary processing. Thereafter, to promote further bonding, the temperature of the fibers may be raised above the curing temperature
  • This two step curing process can permit, for example, additional compression of a web during the second curing step.
  • the temperature may be initially raised above the highest curing temperature of the two binders to simultaneously cure the binders in one curing step.
  • EXAMPLE 8 This example demonstrates the applicability of the process to cellulose fibers and fiber bundle material. Specifically, 1111 grams of a mechanically fiberized wood (10 percent moisture) can be placed in a recirculating conduit 24 with an in-line blower. The blower can be turned on to entrain and the wood fibers. In addition, 850 grams of phenolic resin, such as Cascophen WC04 (55 percent moisture) can be sprayed onto the fiber through a port in the conduit. After addition of the resin, the material can be shunted out of the loop 24, collected in a cyclone 60 and spread on a bench to air dry. Subsequent examination under a scanning electron microscope would reveal individual fibers and individual fiber bundles enclosed in a phenolic resin sheath with substantially no fiber to fiber, fiber to fiber bundle, or fiber bundle to fiber bundle agglomeration due to resin bonding.
  • phenolic resin such as Cascophen WC04

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Abstract

Des fibres naturelles discontinues ont un revêtement d'un liant thermodurci. Une majorité substantielle des fibres, ainsi que tous les faisceaux de fibres dans les fibres, ne sont pas liés les uns aux autres par le matériau liant thermodurci. Un ou plusieurs matériaux particulaires solides peut être collé aux fibres à l'aide du liant par séchage de ce dernier. Le matériau liant est thermopolymérisable et les fibres enrobées peuvent être mélangées à d'autres fibres pour une thermopolymérisation ultérieure et être utilisées pour obtenir une grande variété de produits.
PCT/US1990/001505 1989-03-20 1990-03-20 Produit fibreux naturel revetu d'un materiau liant thermodurci WO1990011170A1 (fr)

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Cited By (12)

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WO1992016681A3 (fr) * 1991-03-22 1992-11-12 Weyerhaeuser Co Fibres discontinues enrobees de liant auxquelles sont collees des matieres particulaires
EP0674934A1 (fr) * 1994-03-31 1995-10-04 Nittetsu Mining Co., Ltd. Filtre avec résistance chimique, propriété antistatique et résistance à la vapeur d'eau, et procédé pour sa fabrication
WO1997014384A1 (fr) * 1995-10-17 1997-04-24 Johnson & Johnson Inc. Structure de couche de transfert fortement absorbante
US5652049A (en) * 1993-11-15 1997-07-29 Paragon Trade Brands, Inc. Antibacterial composite non-woven fabric
US6153668A (en) * 1998-01-30 2000-11-28 3M Innovative Properties Company Low density fire barrier material and method of making
US6503854B1 (en) * 1997-10-31 2003-01-07 Kimberly-Clark Worldwide, Inc. Absorbent composite materials
FR2839001A1 (fr) * 2002-04-25 2003-10-31 Joel Patrick Jean Luc Breard Procede de fabrication d'un nouveau materiau compose de faisceaux de fibres naturelles pre impregnes de resine organique et se presentant sous forme de fil ou de ruban
WO2007131738A1 (fr) * 2006-05-17 2007-11-22 Herbert Costard Fils de fibre naturelle aptes à la découpe et à l'écoulement pour des masses de mise en forme de smc (sheet moulding compounds) et nappes de fibres à charge textile, procédé de fabrication et d'application
EP2035632A4 (fr) * 2006-06-30 2014-05-14 Buckeye Technologies Inc Matériau non-tissé retardateur de flamme et procédé de fabrication
WO2021213955A1 (fr) * 2020-04-21 2021-10-28 Teknoweb Materials S.R.L. Application de systèmes liants durcissables hautement visqueux à des voiles fibreux comprenant des fibres d'origine naturelle
FR3118633A1 (fr) * 2021-01-07 2022-07-08 Saint-Gobain Isover Procédé de fabrication de produits d’isolation à base de fibres naturelles
WO2024028456A1 (fr) * 2022-08-03 2024-02-08 easy2cool GmbH Procédé de fabrication d'un emballage isolant, emballage isolant, installation de fabrication d'un emballage isolant, boîte d'emballage

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
AU665532B2 (en) * 1991-04-26 1996-01-11 Enviroflex Pty. Ltd. Insulation pellets and a process for producing same
JP6737179B2 (ja) * 2014-09-30 2020-08-05 東洋紡株式会社 核酸の分離精製方法および固相担体、デバイス、キット
JP6589298B2 (ja) 2015-03-04 2019-10-16 セイコーエプソン株式会社 シート製造装置およびシート製造方法

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JPS5913244B2 (ja) * 1976-05-12 1984-03-28 本州製紙株式会社 吸着性不織布およびその製造方法
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US2601597A (en) * 1946-09-06 1952-06-24 American Cyanamid Co Application of dispersed coating materials to cellulosic fibers
US4428843A (en) * 1981-06-01 1984-01-31 Venture Chemicals, Inc. Well working compositions, method of decreasing the seepage loss from such compositions, and additive therefor
US4584357A (en) * 1984-06-20 1986-04-22 Weyerhaeuser Company Latex treated cationic cellulose product and method for its preparation

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992016681A3 (fr) * 1991-03-22 1992-11-12 Weyerhaeuser Co Fibres discontinues enrobees de liant auxquelles sont collees des matieres particulaires
US5652049A (en) * 1993-11-15 1997-07-29 Paragon Trade Brands, Inc. Antibacterial composite non-woven fabric
EP0674934A1 (fr) * 1994-03-31 1995-10-04 Nittetsu Mining Co., Ltd. Filtre avec résistance chimique, propriété antistatique et résistance à la vapeur d'eau, et procédé pour sa fabrication
US5607490A (en) * 1994-03-31 1997-03-04 Nittetsu Mining Co., Ltd. Filter having chemical resistance, antistatic property and water vapor resistance, and process for producing the same
WO1997014384A1 (fr) * 1995-10-17 1997-04-24 Johnson & Johnson Inc. Structure de couche de transfert fortement absorbante
US6503854B1 (en) * 1997-10-31 2003-01-07 Kimberly-Clark Worldwide, Inc. Absorbent composite materials
US6153668A (en) * 1998-01-30 2000-11-28 3M Innovative Properties Company Low density fire barrier material and method of making
FR2839001A1 (fr) * 2002-04-25 2003-10-31 Joel Patrick Jean Luc Breard Procede de fabrication d'un nouveau materiau compose de faisceaux de fibres naturelles pre impregnes de resine organique et se presentant sous forme de fil ou de ruban
WO2003091006A3 (fr) * 2002-04-25 2004-04-01 Joel Breard Procede de fabrication d'un nouveau materiau compose de faisceaux de fibres naturelles pre impregnees de resine organique et se presentant sous forme de fil ou de ruban
WO2007131738A1 (fr) * 2006-05-17 2007-11-22 Herbert Costard Fils de fibre naturelle aptes à la découpe et à l'écoulement pour des masses de mise en forme de smc (sheet moulding compounds) et nappes de fibres à charge textile, procédé de fabrication et d'application
EP2035632A4 (fr) * 2006-06-30 2014-05-14 Buckeye Technologies Inc Matériau non-tissé retardateur de flamme et procédé de fabrication
WO2021213955A1 (fr) * 2020-04-21 2021-10-28 Teknoweb Materials S.R.L. Application de systèmes liants durcissables hautement visqueux à des voiles fibreux comprenant des fibres d'origine naturelle
FR3118633A1 (fr) * 2021-01-07 2022-07-08 Saint-Gobain Isover Procédé de fabrication de produits d’isolation à base de fibres naturelles
WO2022148924A1 (fr) * 2021-01-07 2022-07-14 Saint-Gobain Isover Procédé de fabrication de produits d'isolation à base de fibres naturelles
WO2024028456A1 (fr) * 2022-08-03 2024-02-08 easy2cool GmbH Procédé de fabrication d'un emballage isolant, emballage isolant, installation de fabrication d'un emballage isolant, boîte d'emballage

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Publication number Publication date
EP0464136A4 (en) 1992-07-08
CA2012526A1 (fr) 1990-09-20
JPH04504233A (ja) 1992-07-30
AU5349790A (en) 1990-10-22
EP0464136A1 (fr) 1992-01-08

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