US20030093051A1 - Single-use absorbent sanitary article - Google Patents

Single-use absorbent sanitary article Download PDF

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Publication number
US20030093051A1
US20030093051A1 US10/220,531 US22053102A US2003093051A1 US 20030093051 A1 US20030093051 A1 US 20030093051A1 US 22053102 A US22053102 A US 22053102A US 2003093051 A1 US2003093051 A1 US 2003093051A1
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US
United States
Prior art keywords
layer
distributing
absorbing
temporarily storing
sanitary article
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
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US10/220,531
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English (en)
Inventor
Krzysztof Malowaniec
Rainer Mangold
Thomas Wurster
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PAUL-HARTMANN AG
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PAUL-HARTMANN AG
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Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26004652&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US20030093051(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from DE2000110269 external-priority patent/DE10010269C1/de
Priority claimed from DE2000110268 external-priority patent/DE10010268A1/de
Application filed by PAUL-HARTMANN AG filed Critical PAUL-HARTMANN AG
Assigned to PAUL-HARTMANN AG reassignment PAUL-HARTMANN AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MALOWANIEC, KRZYSZTOF D., MANGOLD, RAINER, WURSTER, THOMAS
Publication of US20030093051A1 publication Critical patent/US20030093051A1/en
Abandoned legal-status Critical Current

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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
    • A61F13/45—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 shape
    • A61F13/47—Sanitary towels, incontinence pads or napkins
    • A61F13/472—Sanitary towels, incontinence pads or napkins specially adapted for female use
    • A61F13/47218—Sanitary towels, incontinence pads or napkins specially adapted for female use with a raised crotch region, e.g. hump
    • A61F13/47227—Sanitary towels, incontinence pads or napkins specially adapted for female use with a raised crotch region, e.g. hump for interlabial use
    • 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
    • A61F13/15617—Making absorbent pads from fibres or pulverulent material with or without treatment of the 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/531—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad
    • A61F13/532—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F13/535—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F13/537—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
    • A61F13/53743—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterised by the position of the layer relative to the other layers
    • A61F13/53747—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterised by the position of the layer relative to the other layers the layer is facing the topsheet
    • 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
    • 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
    • A61L15/425—Porous materials, e.g. foams or sponges
    • 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
    • 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
    • A61F13/15203—Properties of the article, e.g. stiffness or absorbency
    • A61F2013/15284—Properties of the article, e.g. stiffness or absorbency characterized by quantifiable properties
    • A61F2013/15422—Density
    • A61F2013/1543—Density with a density gradient in the horizontal plane
    • 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
    • A61F2013/530868—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 characterized by the liquid distribution or transport means other than wicking layer
    • A61F2013/530927—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 characterized by the liquid distribution or transport means other than wicking layer having longitudinal barriers
    • A61F2013/530934—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 characterized by the liquid distribution or transport means other than wicking layer having longitudinal barriers having a density gradient
    • A61F2013/530948—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 characterized by the liquid distribution or transport means other than wicking layer having longitudinal barriers having a density gradient along the length
    • 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
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24355—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
    • Y10T428/24372—Particulate matter
    • Y10T428/24405—Polymer or resin [e.g., natural or synthetic rubber, etc.]
    • 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
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • 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
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y10T428/2457—Parallel ribs and/or grooves

Definitions

  • the invention relates to a single-use absorbent sanitary article, specifically a diaper, women's sanitary napkin or incontinence article, having an at least double-layer absorbent body which includes a layer contacting the body in use for absorbing, distributing and temporarily storing fluid and a storage layer furnished on the side facing away from the body having a content of at least 50% by weight of superabsorbent polymer materials.
  • the invention further relates to a process for producing a layer for absorbing, distributing and temporarily storing fluid in the course of producing a sanitary article of the said type.
  • the high superabsorbent polymer materials content in the storage layer facing away from the body in use serves to permanently store the absorbed fluid because the superabsorbent polymer materials bind aqueous fluid and are converted into a gel-like state. Since the time required for this compared with the discharge time for the fluid during passing of water by the wearer of the sanitary article is relatively long, a layer for absorbing, distributing and temporarily storing fluid is provided in a known way, arranged on the side of the storage layer contacting the body.
  • this layer for absorbing, distributing and temporarily storing fluid is to provide an adequately high absorption rate for the flood of impacting fluid to prevent it from running across the sanitary article in the transverse or longitudinal direction, which would detract from its functionality. Furthermore, the layer for absorbing, distributing and temporarily storing fluid is intended to channel the relatively concentrated contacting fluid into other areas of the absorbent body in order to be able to utilize the fluid absorption capacity available there. The aim is then to distribute fluid within the distribution layer contacting the body, but also to temporarily store and subsequently discharge fluid to the storage layer located thereunder.
  • entangled cellulose fibers which are also described as “curled fibers,” are used in the distribution layer contacting the body.
  • the object of the present invention is to improve an absorbent sanitary article of the generic type such that its layer for absorbing, distributing and temporarily storing fluid has fluid absorbency, distribution and temporary storage characteristics at least as good as the previously named sanitary article, even without substantial content of entangled cellulose fibers.
  • This object is accomplished in the case of a generic sanitary article of the invention by extruding the layer for absorbing, distributing and temporarily storing fluid from a thermoplastic polymer with the addition of a blowing agent.
  • the extruded layer makes available a measured take-up volume of preferably more than 30 ml, even following specifically repeated heavy fluid contact while the sanitary article is in use.
  • the layer for absorbing, distributing and temporarily storing fluid is preferably substantially free of superabsorbent polymer materials, by which it should be understood that it has preferably less than 10%, specifically less than 5% by weight and especially preferably less than 1% by weight of superabsorbent polymer materials.
  • other thermoplastic polymers are suitable in principle for the production of the inventive absorbent structure, e.g., those from the group of the styrene polymers.
  • Additives for example 3% to 30% by weight, specifically 10% to 20% by weight, in the form of fibers, preferably polyester fibers, can also be provided.
  • fibers whose melting or degradation temperature is higher than the melting temperature of the thermoplastic polymers used, passages are formed during the extrusion process which promote the penetration and distribution of aqueous fluid into the structure and within the structure as well as the transfer of the fluid to the storage layer disposed thereunder.
  • the invention makes it possible in a particularly advantageous way for the mass per unit area, i.e., the thickness of the layer for absorbing, distributing and temporarily storing fluid, to be varied in the longitudinal and/or in the transverse direction, where the longitudinal direction by definition should coincide with the direction of extrusion.
  • an extrusion opening specifically an extrusion die
  • structures having any type of cross-section can be achieved.
  • the thickness of the absorbent structure, specifically viewed in cross-section perpendicular to the longitudinal direction could be thicker in the center and in conformity with the structure of the extrusion opening decrease toward the sides in any fashion desired.
  • the layer for absorbing, distributing and temporarily storing fluid can additionally comprise a surfactant substance, specifically a hydrophilizing agent in an amount of preferably 0.2% to 10% by weight.
  • a surfactant substance specifically a hydrophilizing agent in an amount of preferably 0.2% to 10% by weight.
  • the already extruded structure can be contacted secondarily with the hydrophilizing agent. In a preferred manner, this agent is fed to an extrusion apparatus jointly with the remaining initial materials or injected into the already molten polymer mass, so it is already in mixture with the polymer melt before said melt is extruded.
  • Multi-stage rolling of the extruded structure is particularly advantageous. Multi-stage rolling makes it possible to apply several temperature and/or pressure stages. The extruded structure can thereby can be altered/optimized more selectively with respect to the requirements of its later use. Thus it has proven to be advantageous to compress the extruded structure in a first calendering stage at a temperature that is appropriate for keeping the thermoplastic polymer in the extruded structure above the softening temperature. Depending on the polymer used, a temperature of 40°-90° C., specifically 45°-70° C., specifically 50°-60° C., has proven to be suitable. Afterwards the extruded absorbent structure can be advantageously compressed cold in a second calendering stage, which is performed specifically at temperatures of 0° C.-30° C., specifically at 15° C.-25° C.
  • the storage layer is similarly produced as an extruded foamed structure.
  • granular particles of superabsorbent materials are introduced into an extrusion apparatus together with thermoplastic polymer, and the thermoplastic polymer materials are melted at temperatures below the degradation temperature of the superabsorbent polymer materials and extruded with said such materials.
  • both the layer for absorbing, distributing and temporarily storing fluid as well as the storage layer could be produced inside the production machinery by direct co-extrusion.
  • a fluid-impermeable film layer disposed on the side of the storage layer facing away from the body can be produced by co-extrusion with the preceding layers.
  • a fixing agent such as a hot-melt adhesive, can then be advantageously dispensed with, since the extruded layers can be fixated with each other; but also with respect to additional layers and/or elements of the sanitary article by extrusion during the course of production.
  • the layer for absorbing, distributing and temporarily storing fluid has wall sections on both sides extending upwardly in the longitudinal direction of the sanitary article and toward the wearer, which form a leakage barrier. These wall sections then assume the function of gatherings which are usually formed in known sanitary articles from non-woven materials with inserted means of elastification.
  • Also subject of the present invention is also a process for producing a layer for absorbing, distributing and temporarily storing fluid as part of production of a sanitary article.
  • CO 2 is preferably used as the blowing agent, although equally conceivable would be saturated, unsaturated, cyclic hydrocarbons and halogenated hydrocarbons as well as noble gases, such as argon, helium or nitrogen, or a water/air mixture or water itself, preferably in the form of moisture which is part of or in the extruded materials.
  • blowing agent finds itself in a so-called “supercritical state”, in which the phase boundary between fluid and gaseous aggregate state disappears and only a single homogenous phase is present.
  • supercritical state in which the phase boundary between fluid and gaseous aggregate state disappears and only a single homogenous phase is present.
  • the blowing agent can be mixed optimally for preparing a physical foaming process with the molten thermoplastic polymer. If this mixture is then passed through an extrusion opening into an area of lower pressure, the blowing agent evaporates with decreasing temperature, and the foamed open-pore structure of the layer for absorbing, distributing and temporarily storing fluid is created.
  • thermoplastic polymer since not only does the blowing agent have to attain a preferably supercritical state, the thermoplastic polymer must be at least partially melted, temperatures of 80° C. to 200° C. are generated inside the extrusion apparatus.
  • FIG. 1 shows a schematic view of an apparatus for producing a layer for absorbing, distributing and temporarily storing fluid for an inventive sanitary article
  • FIGS. 2 and 3 show a top view and a sectional view through an absorbent body of an inventive sanitary article, respectively;
  • FIG. 4 shows a top view corresponding to FIG. 2 of an absorbent body with a width varying in the longitudinal direction.
  • FIG. 1 shows an apparatus for extruding a layer for absorbing, distributing and temporarily storing fluid.
  • the apparatus includes a funnel-shaped feed device 1 , through which a solid-material mixture, which was preferably produced previously in accordance with the composition by weight percentage of the individual ingredients, can be introduced into a cylindrical interior 4 of a high-pressure stable tubular housing 5 of the extrusion device.
  • a shaft 6 extends in this interior 4 having a helical screw 8 driven by an electric motor. When the shaft 6 is driven, the solid-matter mixture which was introduced is further mixed and transported in longitudinal direction 10 .
  • Heating devices 12 are provided on the outer circumference of the tubular housing 5 .
  • An extrusion tool 16 can be mounted on the end face of the tubular housing 5 at the end opposite the feed device 2 .
  • the extrusion tool 16 communicates through an opening 18 on the end face 14 with the interior 4 of the tubular housing.
  • Injection devices 20 , 22 discharge into the interior 4 , whereby the injection devices 20 , 22 discharge quasi inside the opening 18 .
  • a blowing agent under operating pressure can be introduced into the interior 4 through the injection devices 20 , 22 . In this way, an operating pressure can be set and maintained in the interior 4 during the extrusion process, depending on the blowing agent employed in the extrusion process, generally above 70 bar.
  • a layer for absorbing, distributing and temporarily storing fluid specifically a polypropylene and/or polyethylene granulate, can be used as an example of a thermoplastic polymer.
  • This granulate can be mixed with additives, such as fibers, for example.
  • the mixture obtained in this way is transported into the interior 4 by means of the conveying device 2 .
  • the mixture is brought up to an operating temperature by the heating devices 12 such that the thermoplastic polymer melts.
  • a blowing agent for example CO 2
  • CO 2 is introduced into the interior 4 through the injection devices 20 , 22 so that an operating pressure obtains there which is suitable for extruding the partially molten mixture via the extrusion tool 16 . Since the blowing agent is intended to result in foaming of the thermoplastic polymer, it is preferably introduced into the interior 4 in the so-called “supercritical stage.”
  • FIGS. 1 and 2 show a top view onto or a sectional view through, respectively, a two-ply absorbent body 30 of an inventive sanitary article.
  • the absorbent body 30 comprises a layer for absorbing, distributing and temporarily storing fluid 32 and a storage layer 34 disposed on the side of the layer facing away from the body which comprises a content of at least 50% by weight, specifically at least 80% by weight, of superabsorbent polymer materials which can, for example, be embedded in a fibrous structure (thermoplastic or natural fibers).
  • the layer for absorbing, distributing and temporarily storing fluid is formed from a thermoplastic polymer foamed by extrusion with the addition of a blowing agent.
  • the polymer comprises polyethylene and/or polypropylene.
  • additives in the form of thermoplastic fibers preferably polyester fibers, is added. Additionally it can contain hydrophilizing agents in the form of alkyl sulfonates, fatty acid derivates or fluorochemicals.
  • a porous layer which has a total pore volume of at least 30 ml and which is suitable for the rapid absorption, distribution and temporary storage of fluid is created by the extrusion of the thermoplastic polymer with the addition of a blowing agent.
  • the longitudinal and perpendicular dimensions of layer 32 are less than those of the storage layer 34 disposed thereunder such that layer 32 is located on all sides within the storage layer 34 in top view. In this way impinging fluid cannot pass beyond the edges of storage layer 34 because of the distribution effect within layer 32 .
  • the surface percentage of layer 32 is about 55%- 90% of the surface of the storage layer 34 . But it must be expressly pointed out that any other geometric configuration of layer 32 would be conceivable, specifically layer 32 could have the same length in the longitudinal direction as storage layer 34 , which would be advantageous from the point of view of manufacturing.
  • FIG. 4 shows a top view of a further aspect of an absorptive body 30 , in which the layer for absorbing, distributing and temporarily storing fluid 32 has a varying width b in the longitudinal direction, which corresponds to the direction of extrusion. It is hour-glassed shaped in the instance shown.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Biomedical Technology (AREA)
  • Vascular Medicine (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Hematology (AREA)
  • Dispersion Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Materials For Medical Uses (AREA)
US10/220,531 2000-03-02 2001-03-02 Single-use absorbent sanitary article Abandoned US20030093051A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10010268.9 2000-03-02
DE2000110269 DE10010269C1 (de) 2000-03-02 2000-03-02 Absorbierender Hygieneartikel zum einmaligen Gebrauch und Verfahren zu seiner Herstellung
DE10010269.7 2000-03-02
DE2000110268 DE10010268A1 (de) 2000-03-02 2000-03-02 Absorbierende Struktur sowie Verfahren zu deren Herstellung

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US11/199,016 Expired - Fee Related US7462754B2 (en) 2000-03-02 2005-08-08 Absorbent structure and method for producing the same

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EP1259207A1 (de) 2002-11-27
EP1259206B1 (de) 2005-12-28
AU2001252153A1 (en) 2001-09-12
JP2003524510A (ja) 2003-08-19
US20050273067A1 (en) 2005-12-08
JP2003527895A (ja) 2003-09-24
EP1259207B1 (de) 2005-12-21
JP4902833B2 (ja) 2012-03-21
JP2003530149A (ja) 2003-10-14
ATE282386T1 (de) 2004-12-15
ATE313306T1 (de) 2006-01-15
JP4902832B2 (ja) 2012-03-21
WO2001064153A1 (de) 2001-09-07
JP4675020B2 (ja) 2011-04-20
ATE314037T1 (de) 2006-01-15
PL354400A1 (en) 2004-01-12
EP1259205B1 (de) 2004-11-17
DE50108460D1 (de) 2006-01-26
DE50108543D1 (de) 2006-02-02
EP1259207B2 (de) 2011-01-12
EP1259206A1 (de) 2002-11-27
DE50104539D1 (de) 2004-12-23
WO2001064154A1 (de) 2001-09-07
AU2001250351A1 (en) 2001-09-12
EP1259205A1 (de) 2002-11-27
US7462754B2 (en) 2008-12-09
US20030012928A1 (en) 2003-01-16
AU2001244183A1 (en) 2001-09-12
WO2001064155A1 (de) 2001-09-07

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