Classifications

• • 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
• • 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
  • A61L15/225—Mixtures of macromolecular compounds
• • 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
  • D04H1/58—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 by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
  • D04H1/587—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 by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives characterised by the bonding agents used
• • 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
  • D04H1/58—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 by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
  • D04H1/64—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 by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives the bonding agent being applied in wet state, e.g. chemical agents in dispersions or solutions
• • 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
  • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
  • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
  • D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • D06M15/507—Polyesters
  • D06M15/51—Unsaturated polymerisable polyesters
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/27—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.]
  • Y10T428/273—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.] of coating
  • Y10T428/277—Cellulosic substrate

Definitions

• This invention relates to a sheet, made of unwoven fibrous material, which is suitable for use as toweling, surgical dressings, a diaper base and the like. More particularly, the invention pertains to a binding coating for such a sheet to hold the fibers against displacement and thereby form a strong fabric.
• the invention concerns both the process of producing the coated sheet of loose fibrous mate rial, and the resulting article of manufacture.
• the coating material has been of such a nature that it has resisted passage of moisture through it to the inner fibers of the sheet.
• the coating material has been applied as a continuous layer to secure the additional strengthening effect resulting from the web of coating material interconnecting the entire lengths of the portions of the fibers at the surface. No coating material has, however, been utilized which would satisfactorily absorb and transmit through it, the moisture with which it comes in contact.
• the binding material be restricted to localized portions only at the sheet surface.
• the binding material has been so applied that it becomes confined to the intersections of the fibers, the intervening portions of the fibers being free of binding material.
• a binding material having a high strength and no capacity to absorb or transmit moisture may be used, but the resulting product has not been entirely satisfactory because it has lacked the desired strength.
• the fibrous material will readily absorb moisture because of the open or foraminous nature of the surface but due to the unconnected state of the major portion of the surface fibers they give a loose feel to the product and result in a weak structure.
• this surfacing material is made of a sodium salt of a carboxy alkyl derivative of cellulose, as it has been discovered that this compound if applied and treated in a certain way, will readily absorb and transmit through it, moisture applied to its exposed surface.
• the resulting product has a big str'engthcomparable to the strength of a woven abi ic, despite its formation of randoni disposed fibers. This high strength of the product is retained even after it becomes wet.
• the fibrous sheeting employed to carry out the invention is preferably that obtained by picking apart woven, knitted or felted materials and garnetting these materials or virgin cotton or other cellulosic fibrous materials.
• an especially designed machine of known type picks apart a woven, knitted or felted fabric and the picked material or virgin cotton or other fibrous material is formed into batting or felt of substantially uniform thickness in an especially designed machine termed a garnet.
• This fibrous sheet is economically produced when it is made from waste or rejected cellulosic or wool cloth.
• the cellulosic fibers may be either natural or synthetic.
• the resulting sheet of fibrous material has the advantage over felt or batting produced by a carding process because its fibers are distributed in all directions in a random fashion.
• the uncoated fibrous sheet consequently has substan tially no tensile strength in any direction, but what strength it does possess is nearly uniform in all directions due to the irregular disposition of the fibers. This would not be true of a carded fabric as there the fibers are all lined up in the same direction.
• the binding material of the invention is applied to the surface of this sheet of fibrous material.
• the sheet of irregularly arranged fibers is weak, it has sufilcient strength to be handled during application of this fiber binding material.
• the coating material is applied as a dilute aqueous solution of a sodium salt of carboxy methyl cellulose and this may,'for example be a sodium salt of an ether formed by the reaction of alkali cellulose and monochloro acetic acid in such manner as to obtain a'product having from 0.2 to 1.0 glycolate groups per anhydro carboxy methyl cellulose for application to the fibrous sheet, is a 1% aqueous solution.
• aqueous solution of from 0.5 to 2.0%.
• This aqueous solution may be applied to the fibrous sheet in any appropriate manner which will form a substantially continuous layer, and one suitable way is by bringing the fibrous sheet into contact with a rotating roller upon which the solution is continuously sprayed. A film of the solution is thereby formed upon the roller and this film is transferred to the fibrous sheet as the sheet continuously comes into contact with the rotating roller.
• heat is applied to remove the water of solution.
• This heat is preferably applied by advancing the coated sheet to a rotating roller maintained at a temperature of from 300 to 450 F. This heated roller also serves to drive the coating material into the surface of the fibrous sheet.
• the binding coating should be applied to both sides of the material. Both sides of the product will then be water absorbent. However, if only one side of the fibrous sheet is to be water absorbent. as in the case of a diaper, the cellulosic derivative may be applied only to that side- A water proofing coating may be applied to' the other side if a diaper or like article is to be produced.
• the product has a soft feel and is pliable in the hands. It is non-toxic, and because of its smooth surface texture it may be brought into contact with the most sensitive tissues. It maintains, a high strength'after becoming wet and has a useful strength even in hot water.
• Example 1 -Waste cotton cloth is reduced to fiber form by the picking action of a garnetting machine, and the sheet obtained from this process is subjected to a spray on both sides with a 2% aqueous solution of carboxy methyl cellulose and subjected to a drying action of heated rolls at a temperature of 400 to 420 F. The treated product is then cut to size for disposable cloth napkins.
• Example 4 Waste viscose rayon cloth and waste cotton cloth are garnetted simultaneously on different machines, and the products are conveyed to a common apron so that the garnetted rayon and cotton are joined in sheet form, one surfacebeing extremely soft and water absorbent rayon and the other surface being cotton. This sheet is subjected to the same process as above.
• a moisture absorbent article suitable for toweling comprising a sheet of unwoven fibers having a random distribution and a coating consistlng entirely of a substantially continuous film of a sodium salt of a carboxy alkyl derivative of cellulose which is present as a dry, water-insoluble solid adhering to the fibers, said solid having .5 been made water-insoluble by subjecting it to a temperature of from 300 to 450 F.
• a moisture absorbent article suitable for toweling comprising a sheet of unwoven fibers having a random distribution and a coating consisting entirely of a substantially continuous film of a sodium salt of a carboxy alkyl derivative of cellulose which is present in the range of from 0.25 to 0.40 pound per thousand square feet adhering to the fibers as a dry, water-insoluble solid, said solid having been made water-insoluble by subjecting it to a temperature of from 300' to 450 F.
• a moisture absorbent article suitable for toweling comprising a sheet of unwoven fibers having a random distribution and a substantially continuous coating consisting entirely of sodium carboxy methyl cellulose which is present as a dry, water-insoluble solid adhering to the fibers, said solid having been made water-insoluble by subjecting it to a temperature of from 300 to 450 F.
• a moisture absorbent article suitable for toweling comprising a sheet of unwoven fibers having a random distribution and a substantially continuous coating consisting entirely of sodium carboxy methyl cellulose adhering to the fibers as a dry, water-insoluble solid, said solid having been made water-insoluble by subjecting it to a temperature of from 300 to 450 F., and said coating being present in the range of from 0.25 to 0.40 pound per thousand square feet.
• a moisture absorbent article suitable for toweling which comprises applying to a sheet of unwoven fibers having a random distribution, a substantially continuous coating of a 0.5 to 2.0% aqueous solution of a sodium salt of a carboxy alkyl derivative of cellulose, and applying heat within the range 300 to 450 F. to expel the water of solution and convert the cellulose derivative to an essentially water insoluble product.
• the process of making a moisture absorbent article suitablefor toweling which comprises applying to a sheet of unwoven fibers having a random distribution, a substantially continuous coating of a 0.5 to 2.0% aqueous solution of a sodium salt of a carboxy alkyl derivative of cellulose, and applying heat within the range of 300 to 450 F. to expel the water of solution and convert the cellulose derivative to an essentially water insoluble product, said solution being applied in the quantity to yield a film of the cellulose derivative in the range of from 0.25 to 0.40 pound per thousand square feet.

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• Health & Medical Sciences (AREA)
• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Textile Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• Veterinary Medicine (AREA)
• Public Health (AREA)
• General Health & Medical Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• Epidemiology (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Materials Engineering (AREA)
• Hematology (AREA)
• Dispersion Chemistry (AREA)
• General Chemical & Material Sciences (AREA)
• Biomedical Technology (AREA)
• Heart & Thoracic Surgery (AREA)
• Vascular Medicine (AREA)
• Absorbent Articles And Supports Therefor (AREA)
• Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Priority Applications (6)

Applications Claiming Priority (1)

Publications (1)

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ID=24716328

Family Applications (1)

Country Status (3)

Cited By (4)

Citations (4)

• 1946
  • 1946-06-14 US US676861A patent/US2486803A/en not_active Expired - Lifetime
• 1947
  • 1947-12-10 NL NL165564A patent/NL71299C/nl active
  • 1947-12-10 NL NL136747A patent/NL70726C/nl active
• 1948
  • 1948-02-24 BE BE480598A patent/BE480598A/fr unknown

Patent Citations (4)

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