WO1991001766A1 - Materiau fibreux non tisse superabsorbant - Google Patents

Materiau fibreux non tisse superabsorbant Download PDF

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Publication number
WO1991001766A1
WO1991001766A1 PCT/US1990/004256 US9004256W WO9101766A1 WO 1991001766 A1 WO1991001766 A1 WO 1991001766A1 US 9004256 W US9004256 W US 9004256W WO 9101766 A1 WO9101766 A1 WO 9101766A1
Authority
WO
WIPO (PCT)
Prior art keywords
fibers
fluid
array
sheet
absorbent
Prior art date
Application number
PCT/US1990/004256
Other languages
English (en)
Inventor
Conrad A. D'elia
John D. Hogan
Original Assignee
National Felt 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 National Felt Company filed Critical National Felt Company
Publication of WO1991001766A1 publication Critical patent/WO1991001766A1/fr

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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
    • 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
    • A61F13/15577—Apparatus or processes for manufacturing
    • 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
    • A61F13/513—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its function or properties, e.g. stretchability, breathability, rewet, visual effect; having areas of different permeability
    • A61F13/51305—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its function or properties, e.g. stretchability, breathability, rewet, visual effect; having areas of different permeability having areas of different permeability
    • 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
    • A61F13/539—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
    • 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
    • A61F5/00—Orthopaedic methods or devices for non-surgical treatment of bones or joints; Nursing devices; Anti-rape devices
    • A61F5/48—Devices for preventing wetting or pollution of the bed
    • A61F5/485—Absorbent protective pads
    • 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
    • A61L15/26—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/42—Use of materials characterised by their function or physical properties
    • A61L15/60—Liquid-swellable gel-forming materials, e.g. super-absorbents
    • 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
    • A61F2013/00089—Wound bandages
    • A61F2013/00297—Wound bandages safety barrier for protection of the operator
    • 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
    • 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
    • A61F2013/530613—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 in 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
    • 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
    • A61F2013/53966—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 by needling, sewing, blow-needling

Definitions

  • the invention relates to a product for the safe absorption and containment of fluids, particularly potentially hazardous body fluids and medical liquid waste.
  • Absorbent padding is in widespread use, most extensively in diaper products in catamenial pads and tampons. Many of these products incorporate superabsorbent materials, usually in powdered or particulate form. This is attended by several disadvantages. Powdered ⁇ uperabsorbents are not readily ⁇ fixed in place within a fibrous batt. When wet, these materials tend to clump and displace. More importantly for hazardous waste containment, these products have critical deficiencies: they absorb only limited amounts of fluids (e.g.”, a diaper of a composite material typically only can absorb 10-fold its weight in water); the superabsorbent "gel blocks" and becomes much less absorbent when the top of the superabsorbent is saturated and the products usually ooze and dispel fluid when saturated; especially under pressure.
  • these products typically wick fluid across the top surface, allowing potential contamination of the entire accessible top of the batt.
  • the prior art products serve reasonably well as diapers, meant to absorb a sudden nonhazardous fluid void quickly, to wick it away from the void area immediately, and then to absorb it in powdered, relatively movable superabsorbent.
  • powdered superab ⁇ orbents is prohibited in certain areas in hospitals (e.g., operating rooms) due to their potential adverse health effects.
  • the product of the present invention functions to absorb much larger amounts of potentially hazardous fluids, to remove them from the product surface immediately, and to contain them safely within a strong fibrous batt laced with superabsorbent fibers, which absorb and retain under pressure much larger amounts of fluid than are manageable with prior art products.
  • the exposed surface of the present invention when a batt of the material is used to cover a surface (e.g., a table) , is both strong and presents relatively low friction, facilitating movement of a patient, cadaver or equipment. Moreover, the hazards of using powdered superabsorbents are avoided.
  • the fibers are formulated into an air laid, nonwoven, i ⁇ otropic batt incorporating support fibers which add strength and resiliency when wet, and boost water retention significantly by adsorption characteristics, thereby allowing incorporation of the superabsorbent fibers into a product of great usefulness.
  • Fig. 1 is a * erspective schematic view of one embodiment of the present invention, diagrammatically showing the construction of the material;
  • Fig. 2 is a perspective view of an embodiment of the material of the invention, supplied as a roll;
  • Fig. 3 is a perspective view of a segment of the material of the invention, with folded over ends, as used in the performance of an autopsy, the segment being removed by cutting at line a-a' of Fig. 2;
  • Fig. 4 is a diagrammatic cro ⁇ s- ⁇ ectional illu ⁇ tration of a preferred embodiment of the material of the pre ⁇ ent invention, in a much enlarged ⁇ cale, ⁇ howing the effect of needle punching;
  • Fig. 5 i a diagrammatic illu ⁇ tration of a portion of the nonwoven matrix of the material, in a dry condition, showing just a small number of fibers of each type;
  • Fig. 6 i ⁇ a diagrammatic illustration of the matrix of Fig. 5, but in a wet condition.
  • Fig. 1 shows a portion of a sheet 10 of material according to the invention.
  • the sheet is shown with a fluid-permeable top sheet 12.
  • a fluid-permeable top sheet 12 Underlying the top sheet is a nonwoven absorbent batt 13, composed of a substantially uniform array of support fibers 14 and superabsorbent fibers 15.
  • a fluid impermeable back sheet 16 is bonded to the underside of the absorbent batt 13.
  • the material may be supplied as shielded absorbent padding for certain procedures, as for medical transport, surgical drapes, or autopsy uses.
  • the material can be supplied as a roll 20, as shown in Fig. 2.
  • the water impermeable back sheet 16 may extend around the sides of the absorbent batt 13 and overlie the top edges of the top sheet 14 to provide peripheral side liquid shields 18.
  • the cut ends When a segment of the padding is removed, as by cutting on line a-a 1 of Fig. 2, the cut ends may be folded over as shown in Fig. 3, to provide peripheral end liquid shields 22.
  • the material forms a procedure bed 24 in this configuration.
  • the absorbent material of the invention is a fiber preferably formed of a blend of heterocyclic carbonate and a copolymer of maleic anhydride and i ⁇ obutylene, as described in the aforementioned U.S. Patents Nos. 4,616,063, 4,705,773, 4,731,067, 4,743,244, 4,788,237, and 4,813,945 to Le-Khac, which are hereby incorporated by reference for their disclosures.
  • the fibers are mixed with support fibers, in one embodiment of several deniers of polyester.
  • Other materials which can be used for support fibers include rayon, cotton, polypropylene, nylon, and polyethylene, among others.
  • the support fibers should interlock with the superabsorbent fibers, have good absorbent and adsorbent qualities, and have good resiliency when wet and dry.
  • the superab ⁇ orbent fibers typically comprise 5-50% of the batt fiber content. Increasing superabsorbent content further can cause loss of strength and stability of the product when it is saturated by liquid.
  • Table I lists the composition of several 8" X 12" test samples of fiber mixtures according to the invention, with water retention rates achieved in sample production runs.
  • the horizontal and vertical water retention column ⁇ indicate the number of grams of water retained by the ⁇ ample in each orientation, expre ⁇ sed as a percentage of the dry sample weight.
  • the absorption characteristics and capacity of the end product are determined by many factors, including superabsorbent content, support fiber composition, batt density, and padding size.
  • the horizontal and vertical water retention of the product varies with alterations in support fiber content, denier, fabric weight, and presence of fibrous superabsorbent.
  • Polyester is an ideal support fiber to combine with the ⁇ uperabsorbent fiber, a ⁇ the polyester contributes excellent adsorbency properties and resiliency, which act ⁇ ynergistically with the large absorbence capacity of the ⁇ uperabsorbent fibers when present in sufficient density.
  • sample ⁇ A, B, and C As density of polyester is increased (see sample ⁇ A, B, and C) the amount of water held by the support fibers' adsorbence increases, but not linearly with fabric weight.
  • sample D When some of the polyester of sample C is replaced by an approximately equivalent weight of ⁇ uperabsorbent, as shown in sample D, the water retention in the horizontal plane is increased four-fold, and that in the vertical plane is increased by a factor of seven.
  • sample E in which a finer denier of support polyester fibers i ⁇ u ⁇ ed, the overall fluid retention is clearly a function of both types of fibers.
  • other support fibers for example rayon, will lend different ab ⁇ orbency and adsorbency characteristics.
  • some embodiments of the material absorb sixty-fold the product weight in water.
  • the manufacture of the product is critical to optimizing the water absorption and retention of the material.
  • the superab ⁇ orbent fibers are brittle, and the absorptive capacity of the product is compromised if these fibers are damaged.
  • the preferred manufacture of the product includes combining the chosen fiber blend in a conventional hopper and processing through a Rando ⁇ air laid web former (Rando Machine Corporation, Cincinnati, New York) .
  • the resultant random web i ⁇ ⁇ ub ⁇ equently mechanically ⁇ trengthened by the proce ⁇ of needle punching u ⁇ ing a Fehrer needle loom (Fehrer AG, Linz, Au ⁇ tria) .
  • the size and type of needle, as well as the number of penetrations per square inch depends on the desired strength and density of the material and must be determined experimentally.
  • the web may be formed by a cros ⁇ lay procedure, with carding or garnetting; that is, the web may be formed of several thin layers, which can be built up one on top of the other, in which case the web only approximates an isotropic mix of fibers.
  • This web may be bonded by any conventional mechanical fiber interlocking, or various other bonding methods, including thermal-, point-, spray-, powder-, or ultrasonic-bonding.
  • the product is supplied with top sheet and back sheet secured to opposite faces of the batt.
  • the top sheet and back ⁇ heet may, however, be con ⁇ idered optional. For example, lightly needle punching the ⁇ urface region of the batt (i.e., a portion of the web near it ⁇ surface) has been found to provide sufficient surface strengthening for some use ⁇ by itself.
  • the top sheet should be water-pervious and hydrophobic, to facilitate complete and rapid transfer of fluid to the absorbent batt which it covers.
  • An additional object of the top sheet is to provide a surface presenting a relatively low coefficient of friction upon which patient ⁇ , organ ⁇ , or instruments may be readily moved without tearing the dry or liquid impregnated batt.
  • One top sheet material found particularly ⁇ uitable i ⁇ an extruded dot matrix sheet, Delnet®, (Applied Extrusion Technologies/ Middleton, DE) , in 0.004-0.006 inch thickness.
  • Delnet sheeting may be applied using thermal laminating or by needle punching the batt through the Delnet material, or by other suitable techniques.
  • the nonwoven fibers may be heated to about 330°F and the Delnet sheet to about 230°F; then the two components are placed in contact and light pre ⁇ sure is applied via calendar rollers or other means.
  • the product back sheet can be any suitably water-impervious and tear-resistant material. This material can be corrugated or embos ⁇ ed to facilitate wicking.
  • the product of the invention absorbs large amounts of fluid over brief time intervals.
  • the padding of the invention wick ⁇ fluid primarily downward and then horizontally.
  • Thi ⁇ allow ⁇ the fluid to spread out acros ⁇ the backsheet, where it can come into contact with a large ⁇ urface area of the matrix and be ab ⁇ orbed more quickly than it could move laterally through the matrix.
  • Such action further aid ⁇ in the containment of potentially infectiou ⁇ fluid ⁇ . Contamination by ab ⁇ orbed fluids of patients, per ⁇ onnel and in ⁇ truments is further reduced by the relatively thick top sheet, which provides currently unmatched absorptive capacity for medical uses.
  • a three foot by six foot sheet of material according to the invention will absorb 8 gallons or more of fluid.
  • the product when wet does not shift or clump, and thus retains almost all absorbed liquid, even under pres ⁇ ure, greatly contributing to it ⁇ u ⁇ efulne ⁇ in containment of hazardou ⁇ body fluid ⁇ .
  • Thi ⁇ lend ⁇ particular value to the u ⁇ e of thi ⁇ product in various medical procedures including ⁇ urgery, tran ⁇ port, nur ⁇ ing care, dre ⁇ ing ⁇ , blood banking and autop ⁇ ies. Containment of fluids of potential hazard would also make the product useful in research and clinical laboratories and in facilities where radioactive solutions are handled.
  • Figs. 4-6 there is shown a portion of the material in cros ⁇ ⁇ ection, in a much enlarged scale.
  • the support fibers 14 are shown as solid lines and the superab ⁇ orbent fibers 15 a ⁇ dashed lines, so that they can be distingui ⁇ hed from each other.
  • the circled region 32 shows the effect of needle punching. When the needle (not shown) is withdrawn from the material, it pulls and locks together both support fibers and superabsorbent fibers, and may even pull portions of the fibers back out through top sheet 12, as indicated at 34. ⁇
  • the fibers may cris ⁇ -cro ⁇ s and bend a ⁇ indicated-by the repre ⁇ entative ⁇ upport fiber ⁇ 14A, 14B and 14C " and superabsorbent fibers 15A and 15B in Fig. 5.
  • the superab ⁇ orbent fiber ⁇ swell to many times their dry size - up to about one hundred times their diameter when dry, as shown in Fig. 6 the swelling of the superabsorbent fibers exerts force on the support fibers and stiffen ⁇ them. In many instances, it forces fiber ⁇ which had only loo ⁇ ely cro ⁇ ed and me ⁇ hed when dry to tightly lock, a ⁇ in the illu ⁇ tration. This mechanism is believed to account in part for the ability of the material to retain its physical integrity even when it is holding thirty or forty times (or more) its weight in fluid.
  • the material can be used to retain water for hydroponic plant growth or to make drip irrigation more efficient. (Of course the surface treatment of the superabsorbent material may have to be altered, to substitute a potassium salt for sodium salt.)
  • Industrially it can be incorporated into some kinds of gaskets, to reduce leakage and contain dangerous leaks (e.g., of radioactive coolant).
  • a household use is for collecting liquids on the bottom of a refrigerator compartment or fruit or vegetable drawer.
  • a fabric may be made to wick moisture from a person's skin.
  • trays for meats and other products can be lined with the material to eliminate leaky packages. Clearly, a variety of other uses will occur over time.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Animal Behavior & Ethology (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • General Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Epidemiology (AREA)
  • Vascular Medicine (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Biomedical Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Hematology (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Nursing (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Manufacturing & Machinery (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

Tampon absorbant amélioré destiné à contenir des fluides tels que des liquides organiques, comprenant un réseau isotrope non tissé de fibres de support et de fibres superabsorbantes non thermoplastiques, et sous forme de nappe hautement absorbante. Dans un mode de réalisation préféré, une feuille supérieure perméable aux fluides est fixée sur une face de la nappe absorbante, et une feuille imperméable aux fluides est fixée sur la face opposée. Le produit est formé par la création, par dépôt aérodynamique, d'une bande qui est un mélange au hasard des deux types de fibres, puis à aiguilleter la bande (de préférence après que la feuille supérieure ait été fixée, et à travers la feuille supérieure imperméable aux fluides peut être constituée de matériau qui présente une surface à friction relativement basse.
PCT/US1990/004256 1989-08-10 1990-07-30 Materiau fibreux non tisse superabsorbant WO1991001766A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US39213089A 1989-08-10 1989-08-10
US392,130 1989-08-10

Publications (1)

Publication Number Publication Date
WO1991001766A1 true WO1991001766A1 (fr) 1991-02-21

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Family Applications (1)

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PCT/US1990/004256 WO1991001766A1 (fr) 1989-08-10 1990-07-30 Materiau fibreux non tisse superabsorbant

Country Status (2)

Country Link
AU (1) AU6140990A (fr)
WO (1) WO1991001766A1 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2269602A (en) * 1992-08-13 1994-02-16 Courtaulds Plc Absorbent nonwoven fabric
EP0613834A1 (fr) * 1993-03-05 1994-09-07 PAPER-PAK PRODUCTS, INC. (a Delaware Corporation) Tampon absorbant et son procédé de fabrication
WO1995015138A1 (fr) * 1993-12-03 1995-06-08 Kaysersberg Article d'hygiene feminine muni de capteurs du flux menstruel, son procede de fabrication
WO1997014384A1 (fr) * 1995-10-17 1997-04-24 Johnson & Johnson Inc. Structure de couche de transfert fortement absorbante
WO1999062446A1 (fr) * 1998-06-04 1999-12-09 The Procter & Gamble Company Article absorbant jetable a element de gestion fecale
WO2000004936A2 (fr) * 1998-07-22 2000-02-03 Millennium Ground Control, Inc. Textile a fibres super-absorbantes
US6605552B2 (en) 2000-12-01 2003-08-12 Kimberly-Clark Worldwide, Inc. Superabsorbent composites with stretch
US6648865B1 (en) 1998-07-29 2003-11-18 The Procter & Gamble Company Disposable absorbent article having fecal management member
US6667425B1 (en) 1998-07-29 2003-12-23 The Procter & Gamble Company Disposable absorbent article having fecal management member
US6749593B1 (en) 1998-08-07 2004-06-15 The Procter & Gamble Company Disposable absorbent article comprising fecal management member having fibers oriented in the z-direction
EP2199447A1 (fr) * 2008-12-19 2010-06-23 Michael C. Dehn Feutre polymère super-absorbant et son procédé de fabrication
US9516914B2 (en) 2006-09-06 2016-12-13 IQTEX Patentverwaltunq UG Self-closing ventilation insert and method for producing it

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US4788237A (en) * 1986-12-15 1988-11-29 Arco Chemical Company Sugar-containing water-absorbing composition which facilitates fiber formation
EP0301804A2 (fr) * 1987-07-29 1989-02-01 Arco Chemical Technology, Inc. Procédé et appareil pour la fabrication d'articles fibreux non tissés
US4813945A (en) * 1986-02-26 1989-03-21 Arco Chemical Technology, Inc. Ultrahigh water-absorbing fiber forming composition
EP0361842A2 (fr) * 1988-09-26 1990-04-04 ARCO Chemical Technology, L.P. Articles absorbants à structure multicouche et leur procédé de préparation

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US4743244A (en) * 1985-06-28 1988-05-10 Arco Chemical Company Water absorbing polymer compositions and articles prepared therefrom
US4813945A (en) * 1986-02-26 1989-03-21 Arco Chemical Technology, Inc. Ultrahigh water-absorbing fiber forming composition
US4788237A (en) * 1986-12-15 1988-11-29 Arco Chemical Company Sugar-containing water-absorbing composition which facilitates fiber formation
EP0301804A2 (fr) * 1987-07-29 1989-02-01 Arco Chemical Technology, Inc. Procédé et appareil pour la fabrication d'articles fibreux non tissés
EP0361842A2 (fr) * 1988-09-26 1990-04-04 ARCO Chemical Technology, L.P. Articles absorbants à structure multicouche et leur procédé de préparation

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2269602A (en) * 1992-08-13 1994-02-16 Courtaulds Plc Absorbent nonwoven fabric
EP0613834A1 (fr) * 1993-03-05 1994-09-07 PAPER-PAK PRODUCTS, INC. (a Delaware Corporation) Tampon absorbant et son procédé de fabrication
WO1995015138A1 (fr) * 1993-12-03 1995-06-08 Kaysersberg Article d'hygiene feminine muni de capteurs du flux menstruel, son procede de fabrication
FR2713083A1 (fr) * 1993-12-03 1995-06-09 Kaysersberg Sa Article d'hygiène féminine muni de capteurs du flux menstruel.
WO1997014384A1 (fr) * 1995-10-17 1997-04-24 Johnson & Johnson Inc. Structure de couche de transfert fortement absorbante
WO1999062446A1 (fr) * 1998-06-04 1999-12-09 The Procter & Gamble Company Article absorbant jetable a element de gestion fecale
EP0963747A1 (fr) * 1998-06-04 1999-12-15 The Procter & Gamble Company Article absorbant à usage unique avec couche pour les matières fécales
WO2000004936A3 (fr) * 1998-07-22 2000-04-27 Millennium Ground Control Inc Textile a fibres super-absorbantes
WO2000004936A2 (fr) * 1998-07-22 2000-02-03 Millennium Ground Control, Inc. Textile a fibres super-absorbantes
US6648865B1 (en) 1998-07-29 2003-11-18 The Procter & Gamble Company Disposable absorbent article having fecal management member
US6667425B1 (en) 1998-07-29 2003-12-23 The Procter & Gamble Company Disposable absorbent article having fecal management member
US6749593B1 (en) 1998-08-07 2004-06-15 The Procter & Gamble Company Disposable absorbent article comprising fecal management member having fibers oriented in the z-direction
US6605552B2 (en) 2000-12-01 2003-08-12 Kimberly-Clark Worldwide, Inc. Superabsorbent composites with stretch
US9516914B2 (en) 2006-09-06 2016-12-13 IQTEX Patentverwaltunq UG Self-closing ventilation insert and method for producing it
EP2199447A1 (fr) * 2008-12-19 2010-06-23 Michael C. Dehn Feutre polymère super-absorbant et son procédé de fabrication
WO2010069592A1 (fr) * 2008-12-19 2010-06-24 Michael Christian Dehn Feutre polymère superabsorbant et son procédé de fabrication
CN102282302A (zh) * 2008-12-19 2011-12-14 Iq泰克斯专利管理有限责任公司 超吸收聚合物毡及其制造方法
US8844158B2 (en) 2008-12-19 2014-09-30 Iqtex Patentverwaltung Ug Super absorber polymer felt and method for the production thereof

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