US20150354096A1 - Processing of chemically modified cellulosic fibres - Google Patents

Processing of chemically modified cellulosic fibres Download PDF

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Publication number
US20150354096A1
US20150354096A1 US14/654,498 US201314654498A US2015354096A1 US 20150354096 A1 US20150354096 A1 US 20150354096A1 US 201314654498 A US201314654498 A US 201314654498A US 2015354096 A1 US2015354096 A1 US 2015354096A1
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Prior art keywords
fibres
weight
moisture content
chemically modified
web
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Abandoned
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US14/654,498
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English (en)
Inventor
Wayne Lee Bonnefin
Lucy Louisa BALLAMY
Sarah Wroe
David Parsons
Garry STOREY
Joseph Thompson
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Convatec Technologies Inc
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Convatec Technologies Inc
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Priority claimed from GBGB1223408.4A external-priority patent/GB201223408D0/en
Priority claimed from GB201308774A external-priority patent/GB201308774D0/en
Application filed by Convatec Technologies Inc filed Critical Convatec Technologies Inc
Assigned to CONVATEC TECHNOLOGIES INC. reassignment CONVATEC TECHNOLOGIES INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BALLAMY, LUCY LOUISA, BONNEFIN, WAYNE LEE, PARSONS, DAVID, STOREY, Garry, THOMPSON, JOSEPH, WROE, Sarah
Publication of US20150354096A1 publication Critical patent/US20150354096A1/en
Assigned to WILMINGTON TRUST (LONDON) LIMITED, AS COLLATERAL AGENT reassignment WILMINGTON TRUST (LONDON) LIMITED, AS COLLATERAL AGENT SECURITY AGREEMENT Assignors: 180 MEDICAL, INC., CONVATEC INC., CONVATEC TECHNOLOGIES INC., PRN MEDICAL SERVICES, LLC
Assigned to CONVATEC TECHNOLOGIES INC. reassignment CONVATEC TECHNOLOGIES INC. RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: WILMINGTON TRUST (LONDON) LIMITED
Abandoned legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
    • D01F2/24—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from cellulose derivatives
    • 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
    • A61F13/00051—Accessories for dressings
    • A61F13/00063—Accessories for dressings comprising medicaments or additives, e.g. odor control, PH control, debriding, antimicrobic
    • 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
    • A61F13/01—Non-adhesive bandages or dressings
    • A61F13/01008—Non-adhesive bandages or dressings characterised by the material
    • A61F13/01012—Non-adhesive bandages or dressings characterised by the material being made of natural material, e.g. cellulose-, protein-, collagen-based
    • 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
    • A61F13/02—Adhesive bandages or dressings
    • A61F13/0276—Apparatus or processes for manufacturing adhesive dressings or bandages
    • 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
    • A61L15/22—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing macromolecular materials
    • A61L15/28—Polysaccharides or their derivatives
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B55/00—Preserving, protecting or purifying packages or package contents in association with packaging
    • B65B55/02—Sterilising, e.g. of complete packages
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G15/00—Carding machines or accessories; Card clothing; Burr-crushing or removing arrangements associated with carding or other preliminary-treatment machines
    • 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
    • D04H1/4258—Regenerated 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
    • D04H1/44—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
    • D04H1/46—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 by needling or like operations to cause entanglement of fibres
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
    • D06B1/00—Applying liquids, gases or vapours onto textile materials to effect treatment, e.g. washing, dyeing, bleaching, sizing or impregnating
    • 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
    • D06M11/38—Oxides or hydroxides of elements of Groups 1 or 11 of the Periodic Table
    • 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
    • D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
    • D06M13/10—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing oxygen
    • D06M13/184—Carboxylic acids; Anhydrides, halides or salts thereof
    • D06M13/207—Substituted carboxylic acids, e.g. by hydroxy or keto groups; Anhydrides, halides or salts thereof
    • D06M13/21—Halogenated carboxylic acids; Anhydrides, halides or salts thereof
    • 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
    • D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
    • D06M13/244—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing sulfur or phosphorus
    • D06M13/248—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing sulfur or phosphorus with compounds containing sulfur
    • D06M13/272—Unsaturated compounds containing sulfur atoms
    • D06M13/278—Vinylsulfonium compounds; Vinylsulfone or vinylsulfoxide compounds
    • 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
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/02—Synthetic cellulose 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
    • A61F2013/00361—Plasters
    • A61F2013/00902—Plasters containing means
    • A61F2013/0091—Plasters containing means with disinfecting or anaesthetics means, e.g. anti-mycrobic
    • 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
    • A61F2013/00361—Plasters
    • A61F2013/00902—Plasters containing means
    • A61F2013/00936—Plasters containing means metal
    • 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
    • D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
    • D06M2101/02—Natural fibres, other than mineral fibres
    • D06M2101/04—Vegetal fibres
    • D06M2101/06—Vegetal fibres cellulosic

Definitions

  • This invention relates to chemically modified cellulosic fibres and processes for making nonwoven fibre webs from them.
  • chemically modified cellulosic fibres which may be carded on a carding machine to produce a web.
  • the fibres may be ultimately processed into nonwoven fabrics for instance by needling or entangling the web, the fabrics being suitable for use in absorbent personal products or absorbent medical products such as wound dressings.
  • carding processes suitable for forming webs of chemically modified cellulosic fibres or blends of chemically modified fibres with other non-gelling fibres, for example viscose or Tencel or other cellulosic fibres.
  • Absorbent cellulosic fibres are well known.
  • GB-A-2220881 and GB-A-2094802 describe the production of carboxymethyl cellulose fibres from regenerated cellulose fibres (viscose rayon) fibres or from cotton.
  • carboxymethyl cellulose fibre of greater absorbency and strength can be produced from solvent-spun cellulose fibre.
  • Such fibres are described in EP 0616650 and are manufactured by reacting solvent spun cellulose fibre with a strong alkali and a monochloroacetic acid reagent.
  • alternative chemical modification of cellulose fibres is possible and also has the effect of increasing the absorbency of the cellulose fibre.
  • the cellulose fibre can for instance be modified by sulphonation, for example by substitution with an alkyl sulphonate at one or more of the hydroxyl groups on the anhydroglucose monomers that make up the cellulose backbone forming ether linkages.
  • Modified cellulose of this type is known as cellulose sulphonate or cellulose alkyl sulphonate some of the insoluble forms of which are described in WO2012/061225.
  • Modifying the cellulose fibre requires the fibre to be exposed to one or more reagents which modify the cellulose by substitution, the degree of substitution determining the absorbency and solubility of the fibre. As the degree of substitution is increased the modified cellulose becomes increasingly soluble. As the solubility increases, absorbency also increases.
  • the chemically modified fibres need to be insoluble and retain some of their fibrous form when exposed to wound fluid and consequently a balance needs to be found between solubility and absorbency.
  • the chemically modified fibre can be in the form of a tow, filament, sliver, yarn or staple fibre, woven, non-woven or knitted fabric.
  • an aqueous wash is generally used initially, preferably a mixture of water with a water-miscible organic solvent such as water and IMS, the major portion of the wash being organic solvent.
  • the wash may contain an organic hydroxyl compound, a surfactant, and/or acid.
  • the organic hydroxyl compound is a compound containing at least one alcoholic hydroxyl group, for example ethanol, methanol or another low molecular weight alcohol and/or a compound such as ethylene glycol or propylene glycol.
  • the final wash or finish typically comprises a large percentage of alcohol for instance, 99% industrial alcohol and 1% emulsifier or 100% alcohol.
  • the fibres are dried at low temperature for instance as described in EP 0680344, by forced air drying or radiant heat drying.
  • the drying of the fibres requires the solvents that are released to be managed from an environmental and safety perspective. It would be desirable to reduce the percentage of organic solvents used in the washing process so that environmental and safety standards can be readily met. There are also potential cost and efficiency advantages to using a lower percentage of organic solvents as the cost of materials and duty are reduced.
  • Fibre breakage can also adversely affect the staple length which has the effect of reducing the strength of a carded web and nonwoven fabric made from the fibres. It is possible that fibre breakage leads to a failed card process where no non-woven mat is produced. A weaker product can be more difficult to remove from the wound as the integrity of the dressing can be compromised.
  • the invention provides a chemically modified cellulosic web of fibres having a tensile strength of at least 3N per cm (N/cm) in the cross direction produced by processing fibres having a moisture content of at least 7% by weight.
  • Controlling the moisture content of the fibres either by controlling the drying process following washing of the modified fibres as part of the chemical modification process or by conditioning the fibres to increase their moisture content to at least 7% subsequent to drying, increases the tensile strength of the fibres to the point where it is possible to process the fibres for example on a carding machine to produce a non-woven fibre web without the production of excessive fly or shedding from a fabric produced from the web.
  • the moisture content of the fibres is kept at between 11 and 20% by controlling the drying process following washing of the modified fibres as part of the chemical modification process.
  • the tensile strength is measured in the cross direction on needled webs having a basis weight in the range of 80 to 120 gsm.
  • the invention provides, in a further aspect, a process for producing a non-woven web of chemically modified cellulosic fibres comprising the steps of:
  • the fibres are typically those resulting from a modification process using a wash or final rinse comprising less than 99% by weight such as 95% by weight of organic solvent in the wash liquor.
  • the fibres can be processed into a consolidated form that allows a fabric to be produced by conventional carding means while mitigating the problem of fibre breakage and fly in the environment of the fabric production plant.
  • a consolidated form could for example be a yarn, sliver, woven, non-woven or knitted fabric.
  • the moisture content of the modified cellulosic fibres is increased by exposing the fibres to a moisture rich environment for at least 24 hours.
  • the drying of the fibres at the end of the chemical modification process can be controlled so that the moisture content of the fibres is maintained above 7% until the fibres are subjected to further processing such as with textiling machinery for instance by carding and needling.
  • the carded, needled fibre web has a tensile strength of from 3N/cm to 25 N/cm, more preferably from 7N/cm to 25N/cm and most preferably from 10N/cm to 25N/cm.
  • the tensile strength of the carded, needled web is measured by cutting five specimens to a size of 25 mm ⁇ 75 mm with the long dimension being in the direction to be tested. Tensile testing is carried out at a gauge length (effective test fabric length) of 50 mm. One end of the sample is fixed in an upper jaw of a tensile testing machine and allowed to dangle into the lower jaw. The sample is then fixed by closing the jaws without stretching the sample or allowing it to be slack. The crosshead speed is set to 100 mm/min and the sample pulled to break. The tensile strength is calculated by dividing the force at break by the sample width in cm.
  • the moisture content of the fibres prior to processing with textiling machinery is from 7% to 20% by weight and more preferably from 11% to 18%. More preferably the moisture content is from 11.5% and 15% by weight and most preferably it is between 12 and 15% by weight. A moisture content of 12.5% to 15% is particularly preferred and 15% is most preferred.
  • moisture content is meant the amount of moisture (measured by weight) contained in the sample of fibres as a percentage of its conditioned weight and measured by the loss on drying.
  • the moisture content of the fibres is measured by calculating the loss on drying using a moisture balance operated in accordance with the instrument manual.
  • a moisture balance operated in accordance with the instrument manual.
  • comparative measurements of moisture content can be made using a moisture meter for instance an Aquaboy (TEMI).
  • carding in the present invention is meant a mechanical process that disentangles, cleans and intermixes fibres to produce a continuous web or sliver suitable for further processing.
  • the invention provides a chemically modified cellulosic fibre having a moisture content of at least 7% by weight.
  • FIG. 1 shows the fibre moisture content vs tensile strength of carded needled fabric in the transverse (cross) direction before and after moisture conditioning to increase the moisture content.
  • the column headed IDA in the table of FIG. 1 refers to the percentage of IDA (industrial denatured alcohols) used in the wash liquor as part of the modification process.
  • the columns headed % refer to the % moisture in the fibre and N/cm to the tensile strength of the resulting carded needled web in the transverse direction. It can be seen from FIG. 1 that decreasing the % of IDA in the wash liquor has a negative influence on tensile strength for carded and needled webs made from unconditioned fibres. It can also be seen that once the moisture content of those fibres is raised to more than 11%, such as 12.5 to 14% moisture those tensile strength values of the carded needled web increase.
  • Dressings were prepared by modification of solvent spun cellulose tow to a degree of substitution of 0.3 to form carboxymethylcellulose, neutralising to a pH of 5.5 with an organic acid. Adding 1.2% cationic silver by an ion exchange process in a largely organic solvent such as by the process described in Ep1343510, washing in an aqueous organic solution containing sodium chloride and di-sodium EDTA for light stabilisation and to entrain approximately 0.4% EDTA.
  • the dressings were removed from the packs and then subjected to various controlled environments.
  • Samples were tested immediately after opening the packs. Samples removed from the other environments were sealed into plastic bags during removal, and then tested immediately. The plastic bags (also preconditioned in corresponding controlled environments) were used to maintain the humidity of the environment of the samples until the point of testing.
  • LOD of the samples was determined using the Ohaus moisture balance MB23 operated in accordance with the instruction manual. A sample mass of greater than 1 gram was used. Samples were cut to fit within the weighing pan, ensuring there was adequate clearance from the heating element. A standardised method was used with a maximum temperature limit of 110° C. The endpoint was determined automatically when the sample mass stopped reducing and was stable. Under these conditions the fabric did not char. Typically, samples would be subjected to a 10 minute cycle.
  • Loss on drying is the summation of all the volatile substances that can be removed by heating at 110° C. These include ethanol, water and to some degree acetic acid.
  • fibres for use in wound dressings according to the invention can be successfully textiled between 42% and 50% RH at around 18 to 20° C.
  • Trials suggest that fibres with 10.5% to 11.5% w/w moisture content can be carded efficiently.
  • cellulose ethylsulphonate CES
  • carboxymethyl cellulose CMC
  • tow bundles were prepared to assess the moisture content.
  • Fibres were oven dried at 105° C. for one hour prior to being conditioned at the chosen relative humidity for a minimum of 16 hours.
  • the mass of the oven dried tow bundles (W 1 ) and the conditioned tow bundles (W 2 ) was taken to assess the moisture content of the fibres, using Equation 1.
  • Fibres were tested at 45% RH, 65% RH, and 85% RH.

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Textile Engineering (AREA)
  • Veterinary Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Chemical & Material Sciences (AREA)
  • Vascular Medicine (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Biomedical Technology (AREA)
  • Epidemiology (AREA)
  • Materials Engineering (AREA)
  • Hematology (AREA)
  • Mechanical Engineering (AREA)
  • Medicinal Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Nonwoven Fabrics (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Artificial Filaments (AREA)
US14/654,498 2012-12-20 2013-12-20 Processing of chemically modified cellulosic fibres Abandoned US20150354096A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GBGB1223408.4A GB201223408D0 (en) 2012-12-20 2012-12-20 Processing of chemically modified cellulosic fibres
GB1223408.4 2012-12-20
GB201308774A GB201308774D0 (en) 2013-05-15 2013-05-15 Processing of chemically modified cellulosic fibres
GB1308774.7 2013-05-15
PCT/GB2013/053374 WO2014096843A2 (en) 2012-12-20 2013-12-20 Processing of chemically modified cellulosic fibres

Related Parent Applications (1)

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PCT/GB2013/053374 A-371-Of-International WO2014096843A2 (en) 2012-12-20 2013-12-20 Processing of chemically modified cellulosic fibres

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