WO1994010955A1 - A method for the manufacturing of an absorbent structure and an absorbent article comprising an absorbent structure manufactured according to this method - Google Patents

A method for the manufacturing of an absorbent structure and an absorbent article comprising an absorbent structure manufactured according to this method Download PDF

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Publication number
WO1994010955A1
WO1994010955A1 PCT/SE1993/000973 SE9300973W WO9410955A1 WO 1994010955 A1 WO1994010955 A1 WO 1994010955A1 SE 9300973 W SE9300973 W SE 9300973W WO 9410955 A1 WO9410955 A1 WO 9410955A1
Authority
WO
WIPO (PCT)
Prior art keywords
absorbent
layer
absorbent article
fibres
absorbent structure
Prior art date
Application number
PCT/SE1993/000973
Other languages
French (fr)
Inventor
Urban Widlund
Eje Österdahl
Roy Hansson
Milan Kolar
Original Assignee
Mölnlycke AB
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
Priority to EP94901111A priority Critical patent/EP0773767B1/en
Application filed by Mölnlycke AB filed Critical Mölnlycke AB
Priority to SK651-95A priority patent/SK65195A3/en
Priority to AT94901111T priority patent/ATE188867T1/en
Priority to CA002149523A priority patent/CA2149523A1/en
Priority to DK94901111T priority patent/DK0773767T3/en
Priority to PL93309035A priority patent/PL174363B1/en
Priority to AU55808/94A priority patent/AU5580894A/en
Priority to JP51200994A priority patent/JP3589460B2/en
Priority to US08/436,271 priority patent/US5814034A/en
Priority to DE69327673T priority patent/DE69327673T2/en
Publication of WO1994010955A1 publication Critical patent/WO1994010955A1/en
Priority to NO951931A priority patent/NO951931D0/en
Priority to FI952411A priority patent/FI952411A/en

Links

Classifications

    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING 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
    • D04H1/00Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40Non-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
    • D04H1/42Non-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
    • D04H1/425Cellulose series
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/20Tampons, e.g. catamenial tampons; Accessories therefor
    • A61F13/2051Tampons, e.g. catamenial tampons; Accessories therefor characterised by the material or the structure of the inner absorbing core
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53Absorbent 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
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53Absorbent 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
    • A61F13/534Absorbent 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
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS 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
    • A61L15/00Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/22Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing macromolecular materials
    • A61L15/28Polysaccharides or their derivatives
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS 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
    • A61L15/00Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/42Use of materials characterised by their function or physical properties
    • A61L15/60Liquid-swellable gel-forming materials, e.g. super-absorbents
    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING 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
    • D04H1/00Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40Non-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
    • D04H1/42Non-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
    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING 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
    • D04H1/00Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40Non-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
    • D04H1/58Non-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
    • D04H1/593Non-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 to layered webs
    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING 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
    • D04H1/00Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING 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
    • D04H13/00Other non-woven fabrics
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53Absorbent 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
    • A61F2013/530007Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium being made from pulp
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53Absorbent 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
    • A61F2013/530481Absorbent 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
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53Absorbent 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
    • A61F2013/530481Absorbent 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
    • A61F2013/530489Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials being randomly mixed in with other material
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/69Autogenously bonded nonwoven fabric
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/695Including a wood containing layer
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/699Including particulate material other than strand or fiber material

Definitions

  • the present invention relates to a method for manufacturing of an absorbent structure in an absorbent article, such as a sanitary napkin, a tampon, a panty protector, an incontinence guard, a diaper, a wound or sore dressing, a saliva absorbent and like articles.
  • an absorbent article such as a sanitary napkin, a tampon, a panty protector, an incontinence guard, a diaper, a wound or sore dressing, a saliva absorbent and like articles.
  • absorbent articles of this kind are known to the art.
  • the absorbent bodies of such articles are typically produced by dry-defibering and fluffing cellulose pulp in roll, bale or sheet form for instance, to form a pulp mat, sometimes admixed with so-called superabsorbent material in the pulp mat, these absorbents being polymers which are capable of absorbing many times their own weight of water or body fluid.
  • the pulp body is often compressed so as to enhance its fluid-wicking ability and also in order to reduce pulp body bulk and therewith obtain an article which is as compact as possible.
  • the absorbent body may also include other constituents, for instance constituents which will improve its fluid-aquisition properties or its fluid-retaining properties, or which will increase its coherent strength, i.e. its coherency, and its ability to withstand deformation in use.
  • rewetting i.e. the transference of body fluid that has already been absorbed back into contact with the wearer's skin as a result of external forces, for instance when the wearer sits down. It is generally desired that the surface of the article that lies proximal to the wearer in use will remain as dry as possible.
  • a very large part of the production plants used in the manufacture of the aforesaid hygiene articles is comprised of defibrating equipment, pneumatic conveying systems and mat-forming equipment. This equipment is also the source of serious faults in the production plants. Equipment for compressing the finished pulp mat or the finished hygiene product is furthermore often included downstream of the production plants.
  • the superabsorbent material is normally available in the form of granules, which are difficult to bind to the absorbent structure especially if the percentage of superabsorbent is high, i e 50 % and higher calculated on the total weight of the absorbent structure in a dry state.
  • Flash-dried paper-pulp fibres which may consist of thermomechanical pulp, chemi-thermomechanical pulp, CTMP, or chemical paper pulp, sulphite or sulphate pulp with a dry solids content of about 80% is delivered by means of an air stream in a controlled flow to a forming head arranged above a forming wire and there formed into a web that has a surface weight of 300-1500 g/m 2 and a density of 550-1000 kg/m 3 . Air is sucked away through a suction box placed beneath the wire. The moisture content in the process shall be 5-30%.
  • the web is pre-pressed to a density of 550-1000 kg/m 3 in order to slightly reduce the bulk of the web prior to the final pressing stage.
  • the pressed web has a mechanical strength which enables the web to be rolled-up or handled in sheet form for storage and transportation purposes.
  • the web can be readily defibered and is intended to be converted into fluff for use in the manufacture of absorbent bodies or pads for diapers, sanitary napkins and like articles.
  • the object of the present invention is to provide in an absorbent article of the aforedescribed kind an absorbent structure which exhibits extremely good absorption properties, especially with respect to its ability to spread fluid and also with respect to its ability to retain said fluid within the material.
  • the material will preferably exhibit low rewetting tendencies as well as being capable of being made very thin. It is also desired to provide a simplified method of manufacturing absorbent articles of the kind defined in the introduction.
  • particulate material comprising 30-100%, preferably at least 50% and most preferably at least 70% flash-dried cellulose fibres is dry-formed to a web with a surface weight of between 100-2000 g/m2 and compressed to a density of between 0.3-1.0 g/cm3 and that the web without subsequent defibration and fluffing is incorporated as an absorbent structure in an absorbent article.
  • Non-defibered, dry-formed roll pulp has been found to be an extremely good absorption material and can be used directly as an absorbent material in hygiene articles, without being defibered.
  • the material also has good fluid wicking properties and swelling properties, which are meaningful to the function of the product.
  • the pulp mat is very thin and therefore need not be further compressed in the product or article.
  • Figure 1 illustrates the absorption properties of a dry-formed CTMP- material subsequent to being worked between rolls at different roll spacings. Conventionally formed and compressed pulp mats of CTMP- pulp and chemical pulp respectively were used as references.
  • Figure 2 illustrates the absorption properties of a dry-formed CTMP- material subsequent to being softened. Conventionally formed and compressed mats comprised of CTMP-pulp and chemical pulp respectively were used as references.
  • Figure 3 illustrates the absorption properties of a complete absorbent article manufactured with dry-formed CTMP in the core. Conventionally manufactured products of corresponding compositions were used as references.
  • Figure 4 illustrates the fluid aquisition time of a complete absorbent article produced with dry-formed CTMP in the core. Conventionally manufactured products of corresponding compositions were used as references.
  • Figure 5 illustrates the degree of utilization of a complete absorbent article produced with dry-formed CTMP in the core. Conventionally manufactured products of corresponding compositions were used as references.
  • Figure 6 illustrates the absorption properties of an absorbent structure produced with dry-formed CTMP, both with and without a superabsorbent admixture. Conventionally manufactured pulp cores both with and without a superabsorbent admixture were used as references.
  • Figure 7 illustrates rewetting of a complete absorbent article produced with dry-formed CTMP in the core. Conventionally manufactured products of corresponding compositions were used as references.
  • Figure 8 illustrates the respective rewetting of an unsoftened and a softened absorbent structure in connection with blood absorption which was produced with dry-formed CTMP in the core, both with and with-out a superabsorbent admixture.
  • Figure 9 illustrates rewetting of a completely absorbent article in connection with blood absorption which was produced from dry-formed CTMP in the core. Conventionally manufactured products of corresponding composition were used as references.
  • Figures 10-11 illustrate schematically the composition of various exemplifying embodiments of inventive absorbent articles.
  • Figure 12 illustrates the structure of a cross section of the material in unsoftened condition.
  • Figure 13 illustrates the structure of a cross section of the material in softened condition.
  • important properties of a material used in the manufacture of a hygiene article are its absorbent capacity, absorption rate, wicking capacity, drainage capacity, retention capacity, rewetting, softness and smoothness.
  • the fluids concerned are urine, menstruation blood, blood, fluid matter from wounds and sores, rinsing fluid and saliva.
  • the object of the present invention is to provide in an absorbent article such as a sanitary napkin, tampon, panty protector, incontinence guard, diaper, bed protector, wound or sore dressing, saliva absorbent and like articles, an absorbent structure which exhibits highly effective absorption properties, especially with regard to its fluid-wicking rate and its ability to retain fluid throughout the material.
  • the material will also preferably have low rewetting and be capable of being made very thin and smooth. It is also desired to simplify the manufacturing process.
  • a finished absorbent material in roll form which can be used without needing to be defibered would partially reduce the need for the earlier mentioned defibering equipment, pneumatic conveying systems and mat-forming equipment, and consequently there is a demand for such material.
  • particulate material comprising 30-100%, preferably at least 50% and most preferably at least 70% flash-dried cellulose fibres is dry-formed to a web with a surface weight of between 100-2000 g/m2 and compressed to a density of between 0.3-1.0 g/cm3 and that the web without subsequent defibration and fluffing is incorporated as an absorbent structure in an absorbent article.
  • a dry-formed product which is manufactured from particulate material as mechanical pulp or chemi-thermomechanical pulp (CTMP) or a corresponding product manufactured from sulphite pulp or sulphate pulp, so-called chemical cellulose pulp.
  • CMP chemi-thermomechanical pulp
  • chemical cellulose pulp a product manufactured from sulphite pulp or sulphate pulp
  • Cellulose fibres which have been stiffened chemically may also be used.
  • other particulate matter as superabsorbents, thermoplastic binding fibres and other kind of fibres.
  • Non-treated dry-formed roll pulp has extremely good absorption, wicking and swelling properties, and it has been found possible to use the material immediately as an absorption material in hygiene articles without defibrating the pulp. In the case of certain absorbent articles, it has been found suitable to soften the material slightly prior to its use. One method of softening the material is described below.
  • Dry-formed roll pulp has a good integrity which means that in the case of use of superabsorbent materials in dry-formed roll pulp the granules will be well bound to the absorbent structure and will not spread during further conversion into absorbent hygiene products.
  • Dry-formed cellulose pulp can be produced, for instance, by forming a web of flash-dried paper pulp fibres in accordance with the method described in International Patent Appli cation WO 90/05808.
  • Curl value can be measured according to the method described by B.D. Jordan, N.G. Nguyen in Papper och Tra 4/1986, page 313.
  • the material can be given a softness which renders the material highly suitable for use as an absorption material in the majority of hygiene articles, by working dry-formed roll pulp between for instance corrugated rolls.
  • the material can be brought to different degrees of softness for different product applications, by working the material between different types of rolls and at different roll spacings.
  • Dry-formed roll pulp which has been softened in this way exhibits very good product properties, and the earlier mentioned good absorption properties are not influenced by the softening process to any great extent.
  • the material is delaminated in the softening process as illustrated in figures 12 and 13.
  • the unsoftened material has normally an even high density throughout the whole the thickness of the material (61).
  • the material is delaminated so as to form a plurality of partially separated (63), thin fibre layers (62).
  • Softening and delamination of the material reduces its total density to some extent, although the original density is essentially retained in each individual layer. Because a very high density is retained in the individual layers, the good fluid wicking properties of the material are retained despite the increase in bulk obtained in conjunction with the softening process.
  • the total bulk is increased by up to 300%, normally 1-100%, as a result of the softening process, depending on the method used and the extent to which the material is softened.
  • the aforesaid material softening method has been given solely by way of example and that corresponding results can be achieved with the aid of other methods.
  • the material could eventually be softened by means of ultrasonic energy, microwaves, by moisturizing the material, or with the aid of chemical additives.
  • test body was punched from the material and a line was drawn transversely across the test body at a point 11 cm from one short end of the body.
  • a fluid container was placed adjacent laboratory scales and both the scales and the container were adjusted to a horizontal position.
  • a plexiglass plate was placed on the scales at a 30 g slope, with one free edge of the plate extending slightly down into the container.
  • a line had been drawn transversely across the plate at a point 11 cm from the lower edge of said plate.
  • Test fluid (0.9% NaCl- solution) was poured into the container, until 20 mm of the plexiglass plate was located beneath the surface of the fluid.
  • test body was secured on the plexiglass plate so that the line drawn on the test body coincided with the line drawn on the plate while, at the same time, folding away the lower part of the test body so as to prevent it from coming into contact with the test liquid.
  • a clock was started at the same time as the test body was laid onto the plate, with the test body extended down into the solution to the same extent as the plate. The increase in weight of the test body with time was recorded.
  • test product was secured in a fixture.
  • Test fluid (0.9% NaCl-solution) was delivered to the wetting point of the product over a period of 60 minutes at the rate at which the fluid was absorbed.
  • the amount of fluid absorbed was measured continuously and the total amount of fluid absorbed by the product constitutes the utilized absorption capacity of the test product.
  • the test product was then placed in a fluid bath, in which it had the maximum opportunity of absorbing test fluid.
  • the test product was then again weighed and the total absorption capacity calculated. The degree of utilization is given by the quotient between the utilized absorption capacity of the test product and the total absorption capacity.
  • sample fluid (0.9% NaCl-solution), each comprising 28 ml, were delivered at 20-minute intervals. The time measurement was continued until all fluid had been absorbed. The extent to which the fluid had dispersed in the diaper was noted after each batch. Subsequent to delivering the last batch of fluid, filter paper was placed over the wetting point and loaded with a weight of 1.1 kg for 15 seconds. The filter paper was weighed both before and after applying the load and rewetting was recorded.
  • a diaper intended for a given weight range was weighed and then placed on a flat support surface.
  • An adapted quantity of test fluid (0.9% NaCl- solution, 100 ml for a diaper intended for a weight range of 7-15 kg) was delivered to the wetting point of the diaper.
  • a further 100 ml of fluid was delivered after 20 minutes.
  • a filter paper was placed over the wetting point and loaded with a weight of 1.1 kg for 15 seconds.
  • the filter paper was weighed both before and after applying the load and the result was recorded as a first rewetting instance.
  • another 100 ml of fluid was delivered and when all fluid had been absorbed, the procedure was repeated with a fresh filter paper and the result recorded as a second rewetting instance.
  • test body 65 x 200 mm, was punched from the material.
  • 5 ml test fluid (0.9% NaCl-solution) were delivered to the wetting point on the test body. Dispersion of the fluid was measured after about 30 minutes.
  • a further 5 ml of test fluid (0.9% NaCl-solution) were then delivered to the wetting point and fluid dispersion was measured after about a further 30 minutes.
  • eight filter papers were placed over the wetting point and loaded with a weight of 4.875 kg for 15 seconds. The filter papers were weighed both before and after applying the load and rewetting was recorded.
  • a material was tested under different softening conditions. For instance, in the case of a dry-formed CTMP-material having a surface weight of 900 g/m 2 and a density of 0.63 g/cm 3 , a suitable roll spacing is 1.7-2.4 mm during the softening process. The material is not influenced to any great extent at roll spacings which lie within this range.
  • Figure 1 illustrates the absorption properties at different roll spacings. The results were determined in accordance with Method 1.
  • a Material according to the invention roll spacing 1.7 mm.
  • D Material according to the invention roll spacing 2.0 mm, softened twice.
  • E Material according to the invention roll sparing 2.0 mm, softened four times.
  • F CTMP-pulp density 0J25 g/cm 3 .
  • G Chemical sulphate pulp density 0J25 g/cm 3 .
  • test products were prepared in the form of conventional children's diapers which comprised a T-shaped absorbent body (T-core), which lies nearest the wearer, and a rectangular absorbent body (R- core) which lies beneath the T-core, where the rectangular absorbent body in the test products was produced from an inventive CTMP- material.
  • T-core T-shaped absorbent body
  • R- core rectangular absorbent body
  • the T-shaped absorbent body (T-core) and the rectangular absorbent body (R-core) were comprised of conventional defibred CTMP and chemical pulp.
  • superabsorbent material in an absorbent body will influence the absorption properties of the body.
  • Superabsorbent material can be incorporated in the absorbent body in different ways. For instance it may be admixed with the body material, laid in layers in the body, or disposed therein in some other way. This admixture of superabsorbent material can be effected in conjunction with manufacturing the dry-formed material, although it may also be effected during some other part of the manufacturing process.
  • the absorption properties were compared with an inventive CTMP- material to which no superabsorbent material had been added and also with corresponding pulp cores comprised of conventional defibred CTMP and chemical pulp. The results of this comparison are shown in Figure 6. The results were determined in accordance with Method 1.
  • a Inventive material 350 g/m2.
  • Dry-formed roll pulp will normally have sufficient mat strength for the product applications intended here. If the network strength of certain product applications should be found insufficient, the network strength can be increased by reinforcing the structure in some suitable manner, by adding reinforcing fibres, binding fibres or binding agent to the cellulose fibre mixture. The network strength can also be increased by incorporating a reinforcing layer of, for instance, plastic, non-woven, net or threads in the absorbent structure, or by fastening a reinforcing layer or an outer sheet on one or both sides of the material.
  • a reinforcing layer of, for instance, plastic, non-woven, net or threads in the absorbent structure, or by fastening a reinforcing layer or an outer sheet on one or both sides of the material.
  • a suitable density is 0.3-1.0 g/cm 3 , preferably 0.4-0.9 g/cm 3 and most preferably 0.5-0.85 g/cm 3 .
  • a suitable surface weight is between 100-2000 g/m 2 , preferably 150- 1500 g/m 2 and most preferably 200-1000 g cm 2 .
  • FIG 10 illustrates a diaper constructed in accordance with one embodiment of the invention.
  • the diaper includes, in a conventional manner, an absorbent body 11 which is enclosed between a fluid- permeable top sheet 12, which conveniently comprises a soft non- woven material, a perforated plastic film or the like and which is intended to lie proximal to the wearer in use, and a fluid-impermeable bottom sheet 13.
  • the sheets 12 and 13 have parts which extend beyond the absorbent body 11 and the sheets are joined together at these protruding parts.
  • the bottom sheet 13 is comprised of a suitable plastic material, for instance polyethylene. It will be understood, however, that other known materials can be used for the top and bottom sheets, within the scope of the invention.
  • the absorbent body is comprised of two or more layers, an upper fluid aquisition layer 14 and one or two lower wicking layers and storage layers 15 and 16.
  • the inventive material is used either as a wicking layer 15 or a storage layer 16 or as both these layers.
  • Those layers in which inventive material is not used may be comprised of other types materials, for instance conventional cellulose fibre material.
  • the ptu-pose of the aquisition layer 14 is to rapidly take-up a given quantity of fluid. This fluid shall solely be held loosely in the fibre structure and quickly drained therefrom.
  • the aquisition layer 14 has a relatively open fibre structure of relatively low density and contains 0- 10% superabsorbent material.
  • the superabsorbent material used in the aquisition layer 14 will preferably have a high gel strength, so that an open three-dimensional fibre structure will be retained in this layer after becoming wet.
  • the main purpose of the wicking layer 15 is to transport the fluid received in the aquisition layer 14 effectively to the storage layer 16 located beneath the wicking layer 15 and to ensure that the greatest possible part of the storage layer 16 is utilized for absorption purposes.
  • the wicking layer 15 therefore has a relatively low superabsorbent content.
  • a suitable superabsorbent content in the case of the wicking layer 15 is 0-20%, while a suitable density range is 0.3-1.0 g/cm3.
  • a suitable surface weight range in the case of the wicking layer 15 is 50- 1500 g/m2.
  • the purpose of the storage layer 16 is to absorb and retain the fluid which is dispersed to the storage layer 16 through the wicking layer 15.
  • the storage layer 16 may therefore have a relatively high superabsorbent content and a relatively high density. Suitable density values are 0.4-1.0 g/cm3, while a suitable superabsorbent content is 30-70%.
  • a suitable surface weight range in the case of the storage layer 16 is 100-1500 g/m2.
  • the wicking layer 15 and the storage layer 16 may optionally be combined to form a single layer.
  • the single layer will have a relatively high superabsorbent content and a relatively high density. Suitable density values are 0.3-1.0 g/cm3, while a suitable superabsorbent content is 20-70%.
  • a suitable surface weight range in the case of a combined wicking and storage layer is 150-2000 g/m2.
  • the superabsorbent content of the layer can be varied throughout the product, so as to obtain a superabsorbent gradient in the depth, length and/or the breadth direction of the product.
  • the various layers may have different forms and sizes. Normally, the absorbent structure is combined with some form of elastication, inter alia in the crotch region of the product, in order to improve product efficiency.
  • FIG 11 illustrates an exemplifying embodiment of an inventive saliva absorbent.
  • the saliva absorbent includes, in a conventional manner, an absorbent body 51 which is enclosed between a fluid- permeable top sheet 52, which is suitably comprised of a perforated plastic film or like material and which is intended to he proximal to the wearer when used, and a fluid-impermeable bottom sheet 53.
  • the bottom sheet 53 is comprised of a suitable plastic material, for instance polyethylene. It will be understood, however, that the top sheet 52 and the bottom sheet 53 may be comprised of other known materials within the scope of the invention.
  • the absorbent body 51 is comprised solely of one single layer.
  • This layer may be comprised of inventive dry-formed material and has a relatively high density and a superabsorbent content of 20-80%.
  • a suitable density range in respect of the absorbent body 51 is 0.4-0.8 g/cm3.

Abstract

A method for manufacturing of an absorbent structure in an absorbent article, such as a sanitary napkin, tampon, panty protector, incontinence guard, diaper, bed protector, wound or sore dressing, saliva absorbent and like articles is comprising the use of absorbent material in roll form directly in the product without first defibrating the material and then forming a mat. The material possesses good acquisition properties, which are meaningful to the function of the product. A high surface dryness is obtained, among other things. In addition to cellulose fibres, the absorbent structure may also include superabsorbent material and/or binding fibres, among other ingredients. The pulp mat is very thin, therewith obviating the need to compress the mat further in the product. In the case of certain product applications, the material is softened mechanically prior to its use as an absorbent material.

Description

A METHOD FOR THE MANUFACTURING OF AN ABSORBENT STRUCTURE AND AN ABSORBENT ARTICLE COMPRISING AN ABSORBENT STRUCTURE MANUFACTURED ACCORDING TO THIS METHOD
Background
The present invention relates to a method for manufacturing of an absorbent structure in an absorbent article, such as a sanitary napkin, a tampon, a panty protector, an incontinence guard, a diaper, a wound or sore dressing, a saliva absorbent and like articles.
Many different types of absorbent articles of this kind are known to the art. The absorbent bodies of such articles are typically produced by dry-defibering and fluffing cellulose pulp in roll, bale or sheet form for instance, to form a pulp mat, sometimes admixed with so-called superabsorbent material in the pulp mat, these absorbents being polymers which are capable of absorbing many times their own weight of water or body fluid.
The pulp body is often compressed so as to enhance its fluid-wicking ability and also in order to reduce pulp body bulk and therewith obtain an article which is as compact as possible.
The absorbent body may also include other constituents, for instance constituents which will improve its fluid-aquisition properties or its fluid-retaining properties, or which will increase its coherent strength, i.e. its coherency, and its ability to withstand deformation in use.
One serious drawback with products of this nature is found in the total absorption capacity of the articles and also in the fact that the articles will often leak long before their total absorption capacity has been fully utilized. Among other things, this is because the body fluid discharged by the wearer is unable to penetrate into the absorption material and to spread to hitherto unused areas of the article quickly enough, but instead leaks from the sides of the sanitary napkin, the diaper or the incontinence guard. The ability of the materials used in the article to disperse the absorbed fluid throughout the entire absorbent body and to retain said fluid in the absorption body is thus highly important.
Another problem resides in so-called rewetting, i.e. the transference of body fluid that has already been absorbed back into contact with the wearer's skin as a result of external forces, for instance when the wearer sits down. It is generally desired that the surface of the article that lies proximal to the wearer in use will remain as dry as possible.
Another desideratum with regard to the majority of hygiene products is that the article shall be thin, so that it can be worn as discretely as possible.
A very large part of the production plants used in the manufacture of the aforesaid hygiene articles is comprised of defibrating equipment, pneumatic conveying systems and mat-forming equipment. This equipment is also the source of serious faults in the production plants. Equipment for compressing the finished pulp mat or the finished hygiene product is furthermore often included downstream of the production plants.
A separate problem is related to the use of superabsorbent material in absorbent articles. The superabsorbent material is normally available in the form of granules, which are difficult to bind to the absorbent structure especially if the percentage of superabsorbent is high, i e 50 % and higher calculated on the total weight of the absorbent structure in a dry state.
It is known from International Patent Application WO 90/05808 to produce a pulp web by dry-forming, which is later defibered, so-called dry-formed roll or reel pulp. Flash-dried paper-pulp fibres, which may consist of thermomechanical pulp, chemi-thermomechanical pulp, CTMP, or chemical paper pulp, sulphite or sulphate pulp with a dry solids content of about 80% is delivered by means of an air stream in a controlled flow to a forming head arranged above a forming wire and there formed into a web that has a surface weight of 300-1500 g/m2 and a density of 550-1000 kg/m3. Air is sucked away through a suction box placed beneath the wire. The moisture content in the process shall be 5-30%.
The web is pre-pressed to a density of 550-1000 kg/m3 in order to slightly reduce the bulk of the web prior to the final pressing stage. The pressed web has a mechanical strength which enables the web to be rolled-up or handled in sheet form for storage and transportation purposes. The web can be readily defibered and is intended to be converted into fluff for use in the manufacture of absorbent bodies or pads for diapers, sanitary napkins and like articles.
Another method for the manufacturing of an absorbent structure is described in European Patent 0 122 042, where a mixture of hydrophilic fibres and water insoluble particles of insoluble hydrogel is airlaid into a web and compressed to a density of 0.15 to about 1.0 g/cm3. This method however comprises several production steps, where the dry lap base material is first disintegrated into cellulose fibres by use of a hammer mill, whereafter the fibres are deposited on a screen surface and formed to the absorbent structure, which is then compressed. These manufacturing steps make this process rather complicated and expensive.
Summary of the Invention
The object of the present invention is to provide in an absorbent article of the aforedescribed kind an absorbent structure which exhibits extremely good absorption properties, especially with respect to its ability to spread fluid and also with respect to its ability to retain said fluid within the material. The material will preferably exhibit low rewetting tendencies as well as being capable of being made very thin. It is also desired to provide a simplified method of manufacturing absorbent articles of the kind defined in the introduction. These objects and desiderata are achieved with a manufacturing method in which particulate material comprising 30-100%, preferably at least 50% and most preferably at least 70% flash-dried cellulose fibres is dry-formed to a web with a surface weight of between 100-2000 g/m2 and compressed to a density of between 0.3-1.0 g/cm3 and that the web without subsequent defibration and fluffing is incorporated as an absorbent structure in an absorbent article.
Non-defibered, dry-formed roll pulp has been found to be an extremely good absorption material and can be used directly as an absorbent material in hygiene articles, without being defibered. The material also has good fluid wicking properties and swelling properties, which are meaningful to the function of the product. The pulp mat is very thin and therefore need not be further compressed in the product or article.
In the case of certain product applications in hygiene articles, it is convenient to soften dry-formed roll pulp prior to its use as an absorption material. The earlier mentioned good absorption properties, fluid wicking properties and swelling properties are not influenced by the softening process to any great extent. One method to soften an absorbent sheet is described in European Patent Application EP 0 360 472, where the compressed absorbent material is worked between partially cutting rollers and thereby gaining softness. This method however leads among other things to decreased strength in the softened material.
Brief Description of the Drawings
The invention will now be described in more detail with reference to a number of exemplifying embodiments thereof and also with reference to the accompanying drawings, in which:
Figure 1 illustrates the absorption properties of a dry-formed CTMP- material subsequent to being worked between rolls at different roll spacings. Conventionally formed and compressed pulp mats of CTMP- pulp and chemical pulp respectively were used as references.
Figure 2 illustrates the absorption properties of a dry-formed CTMP- material subsequent to being softened. Conventionally formed and compressed mats comprised of CTMP-pulp and chemical pulp respectively were used as references. Figure 3 illustrates the absorption properties of a complete absorbent article manufactured with dry-formed CTMP in the core. Conventionally manufactured products of corresponding compositions were used as references.
Figure 4 illustrates the fluid aquisition time of a complete absorbent article produced with dry-formed CTMP in the core. Conventionally manufactured products of corresponding compositions were used as references.
Figure 5 illustrates the degree of utilization of a complete absorbent article produced with dry-formed CTMP in the core. Conventionally manufactured products of corresponding compositions were used as references.
Figure 6 illustrates the absorption properties of an absorbent structure produced with dry-formed CTMP, both with and without a superabsorbent admixture. Conventionally manufactured pulp cores both with and without a superabsorbent admixture were used as references.
Figure 7 illustrates rewetting of a complete absorbent article produced with dry-formed CTMP in the core. Conventionally manufactured products of corresponding compositions were used as references.
Figure 8 illustrates the respective rewetting of an unsoftened and a softened absorbent structure in connection with blood absorption which was produced with dry-formed CTMP in the core, both with and with-out a superabsorbent admixture.
Figure 9 illustrates rewetting of a completely absorbent article in connection with blood absorption which was produced from dry-formed CTMP in the core. Conventionally manufactured products of corresponding composition were used as references.
Figures 10-11 illustrate schematically the composition of various exemplifying embodiments of inventive absorbent articles. Figure 12 illustrates the structure of a cross section of the material in unsoftened condition.
Figure 13 illustrates the structure of a cross section of the material in softened condition.
Description of the Invention
As before mentioned, important properties of a material used in the manufacture of a hygiene article are its absorbent capacity, absorption rate, wicking capacity, drainage capacity, retention capacity, rewetting, softness and smoothness.
The fluids concerned are urine, menstruation blood, blood, fluid matter from wounds and sores, rinsing fluid and saliva.
The object of the present invention is to provide in an absorbent article such as a sanitary napkin, tampon, panty protector, incontinence guard, diaper, bed protector, wound or sore dressing, saliva absorbent and like articles, an absorbent structure which exhibits highly effective absorption properties, especially with regard to its fluid-wicking rate and its ability to retain fluid throughout the material. The material will also preferably have low rewetting and be capable of being made very thin and smooth. It is also desired to simplify the manufacturing process. A finished absorbent material in roll form which can be used without needing to be defibered would partially reduce the need for the earlier mentioned defibering equipment, pneumatic conveying systems and mat-forming equipment, and consequently there is a demand for such material.
The aforesaid objects and desiderata have been achieved in accordance with the invention by using a manufacturing method in which particulate material comprising 30-100%, preferably at least 50% and most preferably at least 70% flash-dried cellulose fibres is dry-formed to a web with a surface weight of between 100-2000 g/m2 and compressed to a density of between 0.3-1.0 g/cm3 and that the web without subsequent defibration and fluffing is incorporated as an absorbent structure in an absorbent article. In accordance with the invention, there is used a dry-formed product which is manufactured from particulate material as mechanical pulp or chemi-thermomechanical pulp (CTMP) or a corresponding product manufactured from sulphite pulp or sulphate pulp, so-called chemical cellulose pulp. Cellulose fibres which have been stiffened chemically may also be used. In the dry-formed product can also be included other particulate matter as superabsorbents, thermoplastic binding fibres and other kind of fibres.
Non-treated dry-formed roll pulp has extremely good absorption, wicking and swelling properties, and it has been found possible to use the material immediately as an absorption material in hygiene articles without defibrating the pulp. In the case of certain absorbent articles, it has been found suitable to soften the material slightly prior to its use. One method of softening the material is described below.
Dry-formed roll pulp has a good integrity which means that in the case of use of superabsorbent materials in dry-formed roll pulp the granules will be well bound to the absorbent structure and will not spread during further conversion into absorbent hygiene products.
Dry-formed cellulose pulp can be produced, for instance, by forming a web of flash-dried paper pulp fibres in accordance with the method described in International Patent Appli cation WO 90/05808.
Cellulose pulp fibres have a so-called curl value which defines the crookedness of the fibre. Curl value can be measured according to the method described by B.D. Jordan, N.G. Nguyen in Papper och Tra 4/1986, page 313.
Softening of the Material
The material can be given a softness which renders the material highly suitable for use as an absorption material in the majority of hygiene articles, by working dry-formed roll pulp between for instance corrugated rolls. The material can be brought to different degrees of softness for different product applications, by working the material between different types of rolls and at different roll spacings.
Dry-formed roll pulp which has been softened in this way exhibits very good product properties, and the earlier mentioned good absorption properties are not influenced by the softening process to any great extent.
The material is delaminated in the softening process as illustrated in figures 12 and 13. The unsoftened material has normally an even high density throughout the whole the thickness of the material (61). As a result of the softening process the material is delaminated so as to form a plurality of partially separated (63), thin fibre layers (62). Softening and delamination of the material reduces its total density to some extent, although the original density is essentially retained in each individual layer. Because a very high density is retained in the individual layers, the good fluid wicking properties of the material are retained despite the increase in bulk obtained in conjunction with the softening process. The total bulk is increased by up to 300%, normally 1-100%, as a result of the softening process, depending on the method used and the extent to which the material is softened.
It will be understood that the aforesaid material softening method has been given solely by way of example and that corresponding results can be achieved with the aid of other methods. For instance, the material could eventually be softened by means of ultrasonic energy, microwaves, by moisturizing the material, or with the aid of chemical additives.
Investigation of Material Properties
The test equipment described below was used to evaluate absorption properties.
Method 1. Absorption Properties Up an Inclined Plane
A rectangular test body was punched from the material and a line was drawn transversely across the test body at a point 11 cm from one short end of the body. A fluid container was placed adjacent laboratory scales and both the scales and the container were adjusted to a horizontal position. A plexiglass plate was placed on the scales at a 30g slope, with one free edge of the plate extending slightly down into the container. A line had been drawn transversely across the plate at a point 11 cm from the lower edge of said plate. Test fluid (0.9% NaCl- solution) was poured into the container, until 20 mm of the plexiglass plate was located beneath the surface of the fluid. The test body was secured on the plexiglass plate so that the line drawn on the test body coincided with the line drawn on the plate while, at the same time, folding away the lower part of the test body so as to prevent it from coming into contact with the test liquid. A clock was started at the same time as the test body was laid onto the plate, with the test body extended down into the solution to the same extent as the plate. The increase in weight of the test body with time was recorded.
Method 2. Measurements of Absorption Capacitv and Degree of Utilization
A test product was secured in a fixture. Test fluid (0.9% NaCl-solution) was delivered to the wetting point of the product over a period of 60 minutes at the rate at which the fluid was absorbed. The amount of fluid absorbed was measured continuously and the total amount of fluid absorbed by the product constitutes the utilized absorption capacity of the test product. The test product was then placed in a fluid bath, in which it had the maximum opportunity of absorbing test fluid. The test product was then again weighed and the total absorption capacity calculated. The degree of utilization is given by the quotient between the utilized absorption capacity of the test product and the total absorption capacity.
Method 3. Measurements of Rewetting. Fluid Wicking and Aquisition Time
Four batches of sample fluid (0.9% NaCl-solution), each comprising 28 ml, were delivered at 20-minute intervals. The time measurement was continued until all fluid had been absorbed. The extent to which the fluid had dispersed in the diaper was noted after each batch. Subsequent to delivering the last batch of fluid, filter paper was placed over the wetting point and loaded with a weight of 1.1 kg for 15 seconds. The filter paper was weighed both before and after applying the load and rewetting was recorded.
Method 4. Determining Rewetting Measurements
A diaper intended for a given weight range was weighed and then placed on a flat support surface. An adapted quantity of test fluid (0.9% NaCl- solution, 100 ml for a diaper intended for a weight range of 7-15 kg) was delivered to the wetting point of the diaper. A further 100 ml of fluid was delivered after 20 minutes. When all fluid had been absorbed, a filter paper was placed over the wetting point and loaded with a weight of 1.1 kg for 15 seconds. The filter paper was weighed both before and after applying the load and the result was recorded as a first rewetting instance. After a further 20 minutes, another 100 ml of fluid was delivered and when all fluid had been absorbed, the procedure was repeated with a fresh filter paper and the result recorded as a second rewetting instance.
Method 5. Determining Blood Absorption
A test body, 65 x 200 mm, was punched from the material. 5 ml test fluid (0.9% NaCl-solution) were delivered to the wetting point on the test body. Dispersion of the fluid was measured after about 30 minutes. A further 5 ml of test fluid (0.9% NaCl-solution) were then delivered to the wetting point and fluid dispersion was measured after about a further 30 minutes. Subsequent to the last delivery, eight filter papers were placed over the wetting point and loaded with a weight of 4.875 kg for 15 seconds. The filter papers were weighed both before and after applying the load and rewetting was recorded.
Test Results
Softening
With the intention of investigating how the material was affected at different softening roll spacings when softening the material, a material was tested under different softening conditions. For instance, in the case of a dry-formed CTMP-material having a surface weight of 900 g/m2 and a density of 0.63 g/cm3, a suitable roll spacing is 1.7-2.4 mm during the softening process. The material is not influenced to any great extent at roll spacings which lie within this range. Figure 1 illustrates the absorption properties at different roll spacings. The results were determined in accordance with Method 1.
A Material according to the invention, roll spacing 1.7 mm.
B Material according to the invention, roll spacing 2.0 mm.
C Material according to the invention, roll spacing 2.4 mm.
D Material according to the invention, roll spacing 2.0 mm, softened twice. E Material according to the invention, roll sparing 2.0 mm, softened four times. F CTMP-pulp, density 0J25 g/cm3. G Chemical sulphate pulp, density 0J25 g/cm3.
Absorption Properties of Absorbent Structures
The absorption properties of an inventive CTMP-material having a surface weight of 900 g/m2 and a density of 0.63 g/cm3 compared with those of corresponding pulp cores produced from conventionally defibred and web-formed CTMP and corresponding chemical pulp are shown in Figure 2. In the absence of superabsorbent material, the absorption capacity is about 9 g of fluid for each gram of absorbent material. The results were determined in accordance with Method 1. A Material according to the invention. B CTMP-pulp, density 0J25 g/cm3. C Chemical sulphate pulp, density 0.125 g cm3.
Product Properties of a Complete Absorbent Article
With the intention of studying other properties of complete absorbent articles, test products were prepared in the form of conventional children's diapers which comprised a T-shaped absorbent body (T-core), which lies nearest the wearer, and a rectangular absorbent body (R- core) which lies beneath the T-core, where the rectangular absorbent body in the test products was produced from an inventive CTMP- material. In the conventional products, the T-shaped absorbent body (T-core) and the rectangular absorbent body (R-core) were comprised of conventional defibred CTMP and chemical pulp.
Measurements of the Absorption Capacitv
Products which comprised an inventive CTMP-material exhibited an absorption in grams which was equivalent to the reference products which had corresponding pulp cores that were comprised of conventionally defibred and mat-formed CTMP and chemical pulp. The results are set forth in Figure 3. The results were determined in accordance with Method 2.
A Reference diaper Libero Girl.
B Reference diaper Libero Boy.
C Child diaper comprising inventive material.
Measurements of Fluid Aquisition Time
Products in which the R-core comprised an inventive CTMP-material exhibited a shorter fluid aquisition time than the reference product.
This implies that an R-core which contains inventive CTMP-material is able to drain the T-core more effectively. The results can be seen from Figure 4. The results were determined in accordance with Method
3.
A Reference diaper Libero Girl.
B Reference diaper Libero Boy.
C Child diaper comprising inventive material.
Measurements of the Utilization of the Absorbent Body
A comparison between the degree of utilization of the absorbent body in an absorbent article which contained an inventive CTMP-material and a corresponding absorbent article which contained conventional CTMP and chemical pulp showed that the degree of utilization is about the same, although slightly on the plus side for an inventive CTMP- material. The results can be seen from Figure 5. The results were determined in accordance with Method 2. A Reference diaper Libero Girl. B Reference diaper Libero Boy.
C Child diaper comprising inventive material.
Admixing Superabsorbent Material
The presence of superabsorbent material in an absorbent body will influence the absorption properties of the body. Superabsorbent material can be incorporated in the absorbent body in different ways. For instance it may be admixed with the body material, laid in layers in the body, or disposed therein in some other way. This admixture of superabsorbent material can be effected in conjunction with manufacturing the dry-formed material, although it may also be effected during some other part of the manufacturing process. The absorption properties were compared with an inventive CTMP- material to which no superabsorbent material had been added and also with corresponding pulp cores comprised of conventional defibred CTMP and chemical pulp. The results of this comparison are shown in Figure 6. The results were determined in accordance with Method 1. A Chemical sulphate pulp containing 30% superabsorbent and having a density of 0.125 g/cm3. B Inventive material containing 30% superabsorbent. C Reference diaper containing 30% superabsorbent. D Inventive material containing no superabsorbent.
Rewetting Measurements
Products which comprised an inventive CTMP-material in the R-core exhibited better rewetting values than the reference product. This also implies that an R-core which contains inventive CTMP-material is able to drain the T-core more effectively. The results can be seen from Figure 7. The results were determined in accordance with Method 4. A Reference diaper Libero Girl. B Reference diaper Libero Boy. C Child diaper comprising inventive material.
Rewetting Measurements. Specific for Blood Absorption In the case of blood absorption, products which comprised an inventive softened CTMP-material showed better rewetting values than non- softened products. The results also showed that when absorbing blood, products which lacked superabsorbent material exhibited lower rewetting values than material which contained superabsorbent material. Material which lacks superabsorbent material also disperses blood much more effectively. The results can be seen from Figures 8 and 9. The reference products comprised two different products frequently found on the market. The results were determined in accordance with Method 5. The prerequisites for this effect are that at least one layer of the pulp mat is free from superabsorbent material. Of course, this does not exclude the presence of such material in other parts of the absorbent article.
Figure 8
A Inventive material 350 g/m2.
B Inventive material 350 g/m2, softened.
C Inventive material 350 g/m2 + 5% superabsorbent.
D Inventive material 350 g/m2 + 5% superabsorbent, softened.
Figure 9
A Reference product 1.
B Reference product 2.
C Product containing inventive material.
Network Strength
Dry-formed roll pulp will normally have sufficient mat strength for the product applications intended here. If the network strength of certain product applications should be found insufficient, the network strength can be increased by reinforcing the structure in some suitable manner, by adding reinforcing fibres, binding fibres or binding agent to the cellulose fibre mixture. The network strength can also be increased by incorporating a reinforcing layer of, for instance, plastic, non-woven, net or threads in the absorbent structure, or by fastening a reinforcing layer or an outer sheet on one or both sides of the material.
Density and Surface Weight The softened pulp mat is still very thin, and consequently it is unnecessary in many cases to further compress the mat prior to its use in an absorbent article. A suitable density is 0.3-1.0 g/cm3, preferably 0.4-0.9 g/cm3 and most preferably 0.5-0.85 g/cm3. A suitable surface weight is between 100-2000 g/m2, preferably 150- 1500 g/m2 and most preferably 200-1000 g cm2. When calculating the density, the thickness of the material was measured with the aid of a Mitutoyo thickness meter.
Description of a First Exemplifying Embodiment
Figure 10 illustrates a diaper constructed in accordance with one embodiment of the invention. The diaper includes, in a conventional manner, an absorbent body 11 which is enclosed between a fluid- permeable top sheet 12, which conveniently comprises a soft non- woven material, a perforated plastic film or the like and which is intended to lie proximal to the wearer in use, and a fluid-impermeable bottom sheet 13. The sheets 12 and 13 have parts which extend beyond the absorbent body 11 and the sheets are joined together at these protruding parts. The bottom sheet 13 is comprised of a suitable plastic material, for instance polyethylene. It will be understood, however, that other known materials can be used for the top and bottom sheets, within the scope of the invention.
The absorbent body is comprised of two or more layers, an upper fluid aquisition layer 14 and one or two lower wicking layers and storage layers 15 and 16. The inventive material is used either as a wicking layer 15 or a storage layer 16 or as both these layers. Those layers in which inventive material is not used may be comprised of other types materials, for instance conventional cellulose fibre material.
The ptu-pose of the aquisition layer 14 is to rapidly take-up a given quantity of fluid. This fluid shall solely be held loosely in the fibre structure and quickly drained therefrom. The aquisition layer 14 has a relatively open fibre structure of relatively low density and contains 0- 10% superabsorbent material. The superabsorbent material used in the aquisition layer 14 will preferably have a high gel strength, so that an open three-dimensional fibre structure will be retained in this layer after becoming wet.
The main purpose of the wicking layer 15 is to transport the fluid received in the aquisition layer 14 effectively to the storage layer 16 located beneath the wicking layer 15 and to ensure that the greatest possible part of the storage layer 16 is utilized for absorption purposes. The wicking layer 15 therefore has a relatively low superabsorbent content. A suitable superabsorbent content in the case of the wicking layer 15 is 0-20%, while a suitable density range is 0.3-1.0 g/cm3. A suitable surface weight range in the case of the wicking layer 15 is 50- 1500 g/m2.
The purpose of the storage layer 16 is to absorb and retain the fluid which is dispersed to the storage layer 16 through the wicking layer 15. The storage layer 16 may therefore have a relatively high superabsorbent content and a relatively high density. Suitable density values are 0.4-1.0 g/cm3, while a suitable superabsorbent content is 30-70%. A suitable surface weight range in the case of the storage layer 16 is 100-1500 g/m2.
The wicking layer 15 and the storage layer 16 may optionally be combined to form a single layer. In this case, the single layer will have a relatively high superabsorbent content and a relatively high density. Suitable density values are 0.3-1.0 g/cm3, while a suitable superabsorbent content is 20-70%. A suitable surface weight range in the case of a combined wicking and storage layer is 150-2000 g/m2.
When the wicking layer 15 and the storage layer 16 are combined in a single layer, the superabsorbent content of the layer can be varied throughout the product, so as to obtain a superabsorbent gradient in the depth, length and/or the breadth direction of the product.
The various layers may have different forms and sizes. Normally, the absorbent structure is combined with some form of elastication, inter alia in the crotch region of the product, in order to improve product efficiency. Description of a Second Exemplifying Embodiment
Figure 11 illustrates an exemplifying embodiment of an inventive saliva absorbent. The saliva absorbent includes, in a conventional manner, an absorbent body 51 which is enclosed between a fluid- permeable top sheet 52, which is suitably comprised of a perforated plastic film or like material and which is intended to he proximal to the wearer when used, and a fluid-impermeable bottom sheet 53. The bottom sheet 53 is comprised of a suitable plastic material, for instance polyethylene. It will be understood, however, that the top sheet 52 and the bottom sheet 53 may be comprised of other known materials within the scope of the invention.
The absorbent body 51 is comprised solely of one single layer. This layer may be comprised of inventive dry-formed material and has a relatively high density and a superabsorbent content of 20-80%. A suitable density range in respect of the absorbent body 51 is 0.4-0.8 g/cm3.
It will be understood that the invention is not restricted to the illustrated and described exemplifying embodiments thereof and that other embodiments are conceivable within the scope of the following Claims.

Claims

Claims
1 A method for the manufacturing of an absorbent structure in an absorbent article, such as a diaper, sanitary napkin, tampon, panty protector, incontinence guard, bed protector, wound or sore dressing, saliva absorbent and like articles, characterized in that particulate material comprising 30-100%, preferably at least 50% and most preferably at least 70% flash-dried cellulose fibres is dry-formed to a web with a surface weight of between 100-2000 g/m2 and compressed to a density of between 0.3-1.0 g/cm3 and that the web without subsequent defibration and fluffing is incorporated as an absorbent structure in an absorbent article.
2. A method for the manufacturing of an absorbent structure according to Claim 1, characterized in that said web is compressed to a density of between 0.4-0.9 g/cm3, preferably 0.5-0.85 g/cm3.
3. A method for the manufacturing of an absorbent structure according to one or more of Claims lor2, characterized in that the web in connection to the compression has a moisture content of between 3-20%, preferably between 4-18% and most preferably 11- 16% calculated on the total weight of the web.
4. A method for the manufacturing of an absorbent structure according to one or more of the preceding Claims, characterized in that the web before being incorporated as an absorbent structure in an absorbent article, such as a diaper, sanitary napkin, tampon, panty protector, incontinence guard, bed protector, wound or sore dressing, saliva absorbent and like articles is mechanically softened and therewith delaminated, so as to exhibit a plurality of partially separated thin fibre layers.
5. An absorbent structure characterized in that it has been manufactured according to the method claimed in one of more of Claims 1-4.
6. An absorbent structure manufactured according to Claim 5, characterized in that the surface weight of the structure is between 150-1500 g/m2, preferably 200-1000 g/m2.
7. An absorbent structure according to Claims 5 or 6, characterized in that the cellulose fibres are mainly comprised of fibres of chemi-theπnomechanically produced pulp.
8. An absorbent structure according to Claim 7, characterized in that the chemi-thermomechanical pulp fibres have a curl value of between 0.20 and 0.40.
9. An absorbent structure according to one or more of Claims 5-6, characterized in that the cellulose fibres are mainly comprised of fibres of chemically produced pulp.
10. An absorbent structure according to one or more of Claims 5-9, characterized in that at least an amount of the fibres are chemically stiffened cellulose fibres.
11. An absorbent structure according to one or more of Claims 5-10, characterized in that the structure includes between 20-70% superabsorbent material, preferably between 30-60%, and most preferably 40-50%, calculated on the total weight of the structure in a dry state.
12. An absorbent structure according to one or more of the preceding Claims, characterized in that the structure includes reinforcing means, for instance binding agent, reinforcing fibres or thermoplastic binding fibres.
13. An absorbent structure according to one or more of the preceding Claims, characterized in that the structure includes a reinforcing layer of non-woven, tissue, plastic or net material for instance.
14. An absorbent article such as a diaper, sanitary napkin, panty protector, incontinence guard, bed protector, wound or sore dressing, saliva absorbent and like articles comprising a liquid-permeable top sheet, an essentially liquid-impermeable bottom sheet, and an absorbent body enclosed between said sheets, characterized in that the absorbent body includes an absorbent structure according to one or more of Claims 5-13.
15. An absorbent article according to Claim 14, in which the absorbent body includes at least two layers, a aquisition layer and one or more wicking and/or storage layers, wherein the aquisition layer is intended to quickly take up and deliver fluid to the wicking and/or storage layer or layers, characterized in that the wicking layer comprises an absorbent structure according to Claim 5 having a surface weight of between 100-1500 g/m2 and a density of between 0.3-1.0 g/cm3.
16. An absorbent article according to Claim 15, characterized in that the cellulose fibres in the wicking layer are comprised mainly of fibres of chemi-thermomechanically produced pulp.
17. An absorbent article according to Claim 16, characterized in that the absorbent structure in the wicking layer is covered with a layer of chemical pulp on one side thereof.
18. An absorbent article according to one or more of Claims 15-17, characterized in that at least an amount of the cellulose fibres in the wicking layer are chemically stiffened cellulose fibres.
19. An absorbent article according to one or more of Claims 15-18, characterized in that the wicking layer includes between 0-40%, preferably between 5-30%, and most preferably 10-20%, superabsorbent material calculated on the total weight of the structure in a dry state.
20. An absorbent article according to one or more of Claims 15-19, characterized in that the density of the wicking layer is between 0.4-0.9 g/cm3, preferably between 0.5-0.85 g/cm3.
21. An absorbent article according to one or more of Claims 15-20, characterized in that the surface weight of the wicking layer is between 120-1000 g/m2, preferably between 150-800 g/m2.
22. An absorbent article according to Claim 14, in which the absorbent body includes at least two layers, a aquisition layer and one or more wicking and/or storage layers, wherein the aquisition layer is intended to quickly take up and deliver fluid to the wicking and/or storage layer or layers, characterized in that the storage layer comprises an absorbent structure according to Claim 5 having a surface weight of between 100-2000 g/m2 and a density of between 0.4-1.0 g/cm3.
23. An absorbent article according to Claim 22, characterized in that the cellulose fibres in the storage layer are comprised mainly of fibres of chemi-thermomechanically produced pulp.
24. An absorbent article according to Claim 23, characterized in that the absorbent structure in the storage layer is covered with a layer of chemical pulp on one side thereof.
25. An absorbent article according to one or more of Claims 22-24, characterized in that at least an amount of the cellulose fibres in the storage layer are chemically stiffened cellulose fibres.
26. A n absorbent article according to one or more of Claims 22-25, characterized in that the storage layer includes between 20- 70%, preferably between 30-60%, and most preferably 40-60%, superabsorbent material calculated on the total weight of the structure in a dry state.
27. An absorbent article according to one or more of Claims 22-26, characterized in that the density of the storage layer is between 0.45-0.9 g/cm3, preferably between 0.5-0.85 gcm3.
28. An absorbent article according to one or more of Claims 22-27, characterized in that the surface weight of the storage layer is between 150-1500 g/m2, preferably between 200-1000 g/m2.
PCT/SE1993/000973 1992-11-17 1993-11-15 A method for the manufacturing of an absorbent structure and an absorbent article comprising an absorbent structure manufactured according to this method WO1994010955A1 (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
PL93309035A PL174363B1 (en) 1992-11-17 1993-11-15 Method of obtaining an absorbing structure and absorbing article incorporating such absorbing structure
SK651-95A SK65195A3 (en) 1992-11-17 1993-11-15 Method for the manufacturing of an absorbent structure and an absorbent article comprising an absorbent structure
AT94901111T ATE188867T1 (en) 1992-11-17 1993-11-15 METHOD FOR PRODUCING AN ABSORBENT STRUCTURE AND ABSORBENT ARTICLES HAVING A STRUCTURE PRODUCED ACCORDING TO THIS METHOD
CA002149523A CA2149523A1 (en) 1992-11-17 1993-11-15 A method for the manufacturing of an absorbent structure and an absorbent article comprising an absorbent structure manufactured according to this method (iv)
DK94901111T DK0773767T3 (en) 1992-11-17 1993-11-15 A process for making an absorbent structure and an absorbent article comprising an absorbent structure
EP94901111A EP0773767B1 (en) 1992-11-17 1993-11-15 A method for the manufacturing of an absorbent structure and an absorbent article comprising an absorbent structure manufactured according to this method
AU55808/94A AU5580894A (en) 1992-11-17 1993-11-15 A method for the manufacturing of an absorbent structure and an absorbent article comprising an absorbent structure manufactured according to this method
DE69327673T DE69327673T2 (en) 1992-11-17 1993-11-15 METHOD FOR PRODUCING AN ABSORBING STRUCTURE AND ABSORBING ARTICLE WITH A STRUCTURE PRODUCED ACCORDING TO THIS METHOD
US08/436,271 US5814034A (en) 1992-11-17 1993-11-15 Method for the manufacturing of an absorbent structure and an absorbent article
JP51200994A JP3589460B2 (en) 1992-11-17 1993-11-15 Method for producing absorbent structure and absorbent article comprising absorbent structure produced by this method
NO951931A NO951931D0 (en) 1992-11-17 1995-05-16 Process for the preparation of an absorbent structure and an absorbent article comprising an absorbent structure prepared in accordance with this method IV
FI952411A FI952411A (en) 1992-11-17 1995-05-17 Process for producing an absorbent structure and absorbent articles comprising an absorbent structure made by the process

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9203445-3 1992-11-17
SE9203445A SE508961C2 (en) 1992-11-17 1992-11-17 Absorbent structure and absorbent articles containing the structure in question

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PCT/SE1993/000972 WO1994010954A1 (en) 1992-11-17 1993-11-15 A method for the manufacturing of an absorbent structure and an absorbent article comprising an absorbent structure manufactured according to this method
PCT/SE1993/000971 WO1994010953A1 (en) 1992-11-17 1993-11-15 A method for the manufacturing of an absorbent structure and an absorbent article for blood absorption comprising an absorbent structure manufactured according to this method
PCT/SE1993/000973 WO1994010955A1 (en) 1992-11-17 1993-11-15 A method for the manufacturing of an absorbent structure and an absorbent article comprising an absorbent structure manufactured according to this method
PCT/SE1993/000974 WO1994010956A1 (en) 1992-11-17 1993-11-15 A method for the manufacturing of an absorbent structure and an absorbent article comprising an absorbent structure manufactured according to this method

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PCT/SE1993/000972 WO1994010954A1 (en) 1992-11-17 1993-11-15 A method for the manufacturing of an absorbent structure and an absorbent article comprising an absorbent structure manufactured according to this method
PCT/SE1993/000971 WO1994010953A1 (en) 1992-11-17 1993-11-15 A method for the manufacturing of an absorbent structure and an absorbent article for blood absorption comprising an absorbent structure manufactured according to this method

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US (4) US5817085A (en)
EP (4) EP0773764B1 (en)
JP (4) JPH08503393A (en)
AT (4) ATE188868T1 (en)
AU (4) AU5580894A (en)
CA (4) CA2149028A1 (en)
CO (1) CO4180496A1 (en)
CZ (4) CZ128595A3 (en)
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ES (3) ES2142395T3 (en)
FI (4) FI952410A0 (en)
GB (1) GB2272916B (en)
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5843852A (en) * 1995-12-21 1998-12-01 Kimberly-Clark Worldwide, Inc. Absorbent structure for liquid distribution

Families Citing this family (125)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE503107C2 (en) 1994-07-11 1996-03-25 Moelnlycke Ab Dambinding and method of manufacture thereof
CA2141181A1 (en) 1994-09-21 1996-03-22 Kimberly-Clark Worldwide, Inc. Wet-resilient webs
US6171695B1 (en) 1994-09-21 2001-01-09 Kimberly-Clark Worldwide, Inc. Thin absorbent pads for food products
US5575047A (en) * 1994-11-25 1996-11-19 Athena Medical Corporation Method for making biodegradable absorbent pads
SE503778C2 (en) * 1994-12-30 1996-09-02 Moelnlycke Ab Absorbent articles in which the storage layer is formed by dividing a material web along an undulated dividing curve
SE508626C2 (en) * 1994-12-30 1998-10-19 Sca Hygiene Prod Ab A material with high absorption capacity as well as an absorbent structure and an absorbent article comprising the material in question
SE508041C2 (en) 1994-12-30 1998-08-17 Moelnlycke Ab Absorbent articles
SE503779C2 (en) * 1994-12-30 1996-09-02 Moelnlycke Ab Absorbent articles, comprising a receiving space in a storage layer, which upon wetting increases in extent perpendicular to the surface of the article and absorbent body
US5562645A (en) * 1995-05-31 1996-10-08 Kimberly-Clark Corporation Article with soft absorbent pulp sheet
SE510531C2 (en) 1996-05-02 1999-05-31 Sca Hygiene Prod Ab Hollow-casing layer for absorbing articles, as well as ways of making the casing layer
SE510901C2 (en) * 1996-05-31 1999-07-05 Sca Hygiene Prod Ab Absorbent structure and production of absorbent structure by mat formation together with adhesive bonded layers
SE513240C2 (en) * 1996-05-31 2000-08-07 Sca Hygiene Prod Ab Textile fiber reinforced absorbent material
SE511903C2 (en) 1996-06-28 1999-12-13 Sca Hygiene Prod Ab Absorbent articles comprising an absorbent body with improved fluid inlet properties
SE507797C2 (en) * 1996-11-15 1998-07-13 Moelnlycke Ab Absorbent structure comprising two different types of material for use in an absorbent article
US6485667B1 (en) 1997-01-17 2002-11-26 Rayonier Products And Financial Services Company Process for making a soft, strong, absorbent material for use in absorbent articles
US5916670A (en) * 1997-01-17 1999-06-29 Rayonier Inc. Absorbent material for use in absorbent articles
SE512700C2 (en) 1997-02-04 2000-05-02 Sca Hygiene Prod Ab Absorbent articles with improved surface properties
SE509535C2 (en) * 1997-06-24 1999-02-08 Moelnlycke Ab Absorbent articles with improved leakage safety
SE513200C2 (en) 1997-06-26 2000-07-31 Sca Hygiene Prod Ab Sanitary napkin
SE513169C2 (en) 1997-06-27 2000-07-17 Sca Hygiene Prod Ab Methods of manufacturing a hollowed casing layer for an absorbent article, such fabricated material, and an absorbent article with such casing layer
SE510391C2 (en) 1997-08-20 1999-05-17 Sca Hygiene Prod Ab Absorbent articles
US6383960B1 (en) 1997-10-08 2002-05-07 Kimberly-Clark Worldwide, Inc. Layered absorbent structure
GB2346902B (en) * 1997-10-31 2002-02-20 Kimberly Clark Co Absorbent composite materials
SE517885C2 (en) 1998-03-26 2002-07-30 Sca Hygiene Prod Ab Absorbent articles with a raised portion
US6162961A (en) * 1998-04-16 2000-12-19 Kimberly-Clark Worldwide, Inc. Absorbent article
SE517717C2 (en) 1998-05-12 2002-07-09 Sca Hygiene Prod Ab A mold element having corrugations and an absorbent article having such a mold element
US20040033750A1 (en) * 1998-06-12 2004-02-19 Everett Rob D Layered absorbent structure with a heterogeneous layer region
US6710225B1 (en) 1998-06-15 2004-03-23 Kimberly-Clark Worldwide, Inc. Layered absorbent structure with a zoned basis weight
US6675702B1 (en) 1998-11-16 2004-01-13 Alexander Maksimow Method and device for producing a strip of cellulose fiber material for use in hygiene articles
US6368609B1 (en) 1999-04-12 2002-04-09 Kimberly-Clark Worldwide, Inc. Absorbent structure including a thin, calendered airlaid composite and a process for making the composite
WO2000034567A2 (en) 1998-12-10 2000-06-15 Kimberly-Clark Worldwide, Inc. An absorbent structure including a thin, calendered airlaid composite and a process for making the composite
US6472045B1 (en) 1998-12-23 2002-10-29 Kimberly-Clark Worldwide, Inc. Liquid transfer material of a transversely extensible and retractable necked laminate of non-elastic sheet layers
US6610383B1 (en) 1998-12-23 2003-08-26 Kimberly-Clark Worldwide, Inc. Transversely extensible and retractable necked laminate of no-elastic sheet layers
US6475600B1 (en) 1998-12-23 2002-11-05 Kimberly-Clark Worldwide, Inc. Composite material having stretch and recovery including a layer of an elastic material and a transversely extensible and retractable necked laminate of non-elastic sheet layers
US6534149B1 (en) 1999-04-03 2003-03-18 Kimberly-Clark Worldwide, Inc. Intake/distribution material for personal care products
US6348253B1 (en) 1999-04-03 2002-02-19 Kimberly-Clark Worldwide, Inc. Sanitary pad for variable flow management
US6296929B1 (en) 1999-04-12 2001-10-02 Kimberly-Clark Worldwide, Inc. Absorbent member exhibiting exceptional expansion properties when wetted
US6146568A (en) * 1999-04-12 2000-11-14 Kimberly-Clark Worldwide, Inc. Method of making an absorbent member
US6189162B1 (en) 1999-05-27 2001-02-20 Kimberly-Clark Worldwide, Inc. Combination receptacle and fluid immobilizer
SE514214C2 (en) 1999-05-28 2001-01-22 Sca Hygiene Prod Ab Absorbent articles with improved fluid handling ability
ZA200004161B (en) * 1999-08-16 2002-02-15 Johnson & Johnson Inc Absorbent structure suitable for use in a sanitary absorbent article.
JP2003509162A (en) * 1999-09-21 2003-03-11 ウェヤーハウザー・カンパニー Grooved absorbent composite
US6723892B1 (en) 1999-10-14 2004-04-20 Kimberly-Clark Worldwide, Inc. Personal care products having reduced leakage
US6627789B1 (en) 1999-10-14 2003-09-30 Kimberly-Clark Worldwide, Inc. Personal care product with fluid partitioning
US6455753B1 (en) 1999-11-12 2002-09-24 Tyco Healthcare Retail Services Ag Absorbent article with improved fluid acquisition system
US6509513B2 (en) 1999-11-12 2003-01-21 Tyco Healthcare Retail Services Ag Absorbent article with improved fluid acquisition system
US6566578B1 (en) 1999-11-12 2003-05-20 Tyco Healthcare Retail Services Ag Absorbent article with improved fluid acquisition system and method of making the same
US6437214B1 (en) 2000-01-06 2002-08-20 Kimberly-Clark Worldwide, Inc. Layered absorbent structure with a zoned basis weight and a heterogeneous layer region
DE60124962T2 (en) 2000-01-14 2007-03-08 Kao Corp. Process for the production of material for the disposal of excrements
DE20000887U1 (en) 2000-01-19 2001-06-07 Riesinger Geb Dahlmann Collection bag with suction device
US6627041B2 (en) * 2000-03-06 2003-09-30 Georgia-Pacific Corporation Method of bleaching and providing papermaking fibers with durable curl
SE517119C2 (en) 2000-04-13 2002-04-16 Sca Hygiene Prod Ab The sanitary napkin with the absorption body that extends continuously tapered backwards
ITBO20000569A1 (en) * 2000-10-02 2002-04-02 G D M S P A METHOD FOR THE PRODUCTION OF ABSORBENT ITEMS AND ABSORBENT ITEM OBTAINED BY SUCH METHOD
US6786893B2 (en) 2000-11-02 2004-09-07 Sca Hygiene Products Ab Elastic absorbent article
DE10057518A1 (en) * 2000-11-21 2002-07-18 Sca Hygiene Prod Gmbh Multi-layer flat product, which consists of tissue paper and / or non-woven nonwoven
US7411110B2 (en) 2000-12-20 2008-08-12 Kimberly-Clark Worldwide, Inc. Thin, high capacity absorbent structure and method for producing same
US20020115971A1 (en) * 2000-12-20 2002-08-22 Holmes Lori Tassone Thin, high capacity multi-layer absorbent core
US6664437B2 (en) * 2000-12-21 2003-12-16 Kimberly-Clark Worldwide, Inc. Layered composites for personal care products
US6929629B2 (en) * 2001-04-20 2005-08-16 Sca Hygiene Products Ab Absorbent article with improved fit
US6866658B2 (en) * 2001-04-20 2005-03-15 Sca Hygiene Products Ab Absorbent product with improved fit
US7316673B2 (en) * 2001-04-20 2008-01-08 Sca Hygiene Products Ab Absorbent article with improved fit
US6945967B2 (en) * 2001-04-20 2005-09-20 Sca Hygiene Products Ab Absorbent product with improved fit
WO2002094328A2 (en) * 2001-05-23 2002-11-28 Basf Aktiengesellschaft Double-sided coated fibrous web absorbent article
US20020177832A1 (en) 2001-05-23 2002-11-28 Elena Fernandez-Kleinlein Adaptable absorbent articles
SE519783C2 (en) 2001-08-31 2003-04-08 Sca Hygiene Prod Ab Absorbent articles including apertures in the absorbent body
US7795492B2 (en) 2001-08-31 2010-09-14 Sca Hygiene Products Ab Absorbent article having openings in the absorbent body
JP2003085910A (en) * 2001-09-11 2003-03-20 Sony Corp Disk cartridge, disk recording medium device and disk recording and reproducing device
US6862819B2 (en) 2001-10-30 2005-03-08 Weyerhaeuser Company System for producing dried singulated cellulose pulp fibers using a jet drier and injected steam
US7018508B2 (en) 2001-10-30 2006-03-28 Weyerhaeuser Company Process for producing dried singulated crosslinked cellulose pulp fibers
US7334347B2 (en) 2001-10-30 2008-02-26 Weyerhaeuser Company Process for producing dried, singulated fibers using steam and heated air
US6769199B2 (en) 2001-10-30 2004-08-03 Weyerhaeuser Company Process for producing dried singulated cellulose pulp fibers using a jet drier and injected steam and the product resulting therefrom
US6782637B2 (en) 2001-10-30 2004-08-31 Weyerhaeuser Company System for making dried singulated crosslinked cellulose pulp fibers
US6748671B1 (en) 2001-10-30 2004-06-15 Weyerhaeuser Company Process to produce dried singulated cellulose pulp fibers
JP2003153639A (en) 2001-11-19 2003-05-27 Kao Corp Pet toilet
US20030125701A1 (en) * 2001-12-06 2003-07-03 Urban Widlund Absorbent article with improved fit
SE520686C2 (en) 2001-12-06 2003-08-12 Sca Hygiene Prod Ab Absorbent articles with improved fit
US7601144B2 (en) * 2001-12-06 2009-10-13 Sca Hygiene Products Ab Absorbent article with improved fit
US7156832B2 (en) * 2001-12-06 2007-01-02 Sca Hygiene Products Ab Absorbent Article having a stiffening element and elongate through-hole
US20030130643A1 (en) * 2001-12-06 2003-07-10 Solgun Drevik Absorbent article with improved fit
JP3804772B2 (en) * 2001-12-21 2006-08-02 花王株式会社 Excrement disposal tool for pet
US6783826B2 (en) 2001-12-21 2004-08-31 Kimberly-Clark Worldwide, Inc. Flushable commode liner
US6713140B2 (en) 2001-12-21 2004-03-30 Kimberly-Clark Worldwide, Inc. Latently dispersible barrier composite material
SE0200950D0 (en) 2002-03-27 2002-03-27 Sca Hygiene Prod Ab Absorbent articles
US7662460B2 (en) * 2002-05-01 2010-02-16 Basf Aktiengesellschaft Plasticized superabsorbent polymer sheets and use thereof in hygienic articles
US6838591B2 (en) * 2002-05-06 2005-01-04 Tyco Healthcare Retail Services, Ag Absorbent article with C-fold layer fluid acquisition system, C-fold layer fluid acquisition system for use in absorbent articles and method of making the same
US7175727B2 (en) 2002-08-30 2007-02-13 Kimberley-Clark Worldwide, Inc. Shaped absorbent pads and associated method for making
US6844482B2 (en) 2002-11-13 2005-01-18 Sca Hygiene Products Ab Absorbent article with improved liquid acquisition capacity
US7378566B2 (en) * 2002-12-13 2008-05-27 Kimberly-Clark Worldwide, Inc. Absorbent core including folded substrate
US7294591B2 (en) * 2002-12-13 2007-11-13 Kimberly-Clark Worldwide, Inc. Absorbent composite including a folded substrate and an absorbent adhesive composition
US6863924B2 (en) * 2002-12-23 2005-03-08 Kimberly-Clark Worldwide, Inc. Method of making an absorbent composite
US7850672B2 (en) * 2003-03-26 2010-12-14 Sca Hygiene Products Ab Absorbent article comprising an absorbent structure
US8246593B2 (en) * 2003-07-03 2012-08-21 The Procter & Gamble Company Sanitary napkin for dynamic body fit
US8303563B2 (en) 2003-11-20 2012-11-06 Sca Hygiene Products Ab Absorbent article with distinctive sheet underneath backsheet
US8147472B2 (en) 2003-11-24 2012-04-03 Kimberly-Clark Worldwide, Inc. Folded absorbent product
US20050112979A1 (en) * 2003-11-24 2005-05-26 Sawyer Lawrence H. Integrally formed absorbent materials, products incorporating same, and methods of making same
US20050109442A1 (en) * 2003-11-24 2005-05-26 Kimberly-Clark Worldwide, Inc. Quick change gender specific forming surface and method of using same
DE602005016905D1 (en) * 2004-03-31 2009-11-12 Procter & Gamble WINDEL WITH IMPROVED BODY FIT
CN101257875A (en) 2005-09-06 2008-09-03 泰科保健集团有限合伙公司 Self contained wound dressing with micropump
EP3292846A1 (en) 2005-11-02 2018-03-14 BSN Medical GmbH Absorption body for attachment to human or animal skin surfaces
WO2007102413A1 (en) 2006-03-03 2007-09-13 Matsushita Electric Industrial Co., Ltd. Transmitting device, receiving device and transmitting/receiving device
GB0606661D0 (en) 2006-04-03 2006-05-10 Brightwake Ltd Improvements relating to dressings
JP5289955B2 (en) * 2006-08-04 2013-09-11 住友精化株式会社 Water-absorbent resin particles, method for producing the same, and absorbent body using the same
US7891320B2 (en) * 2006-12-27 2011-02-22 Kao Corporation Sheet for pets
WO2009072947A1 (en) 2007-12-07 2009-06-11 Sca Hygiene Products Ab New absorbent core
GB0809131D0 (en) * 2008-05-20 2008-06-25 Brightwake Ltd Soft silicones tapes
DE102008037888A1 (en) * 2008-08-15 2010-02-25 Birgit Riesinger Wound care articles comprising textile ribbons having fibers with gel-forming properties and fibers having non-gelling properties
WO2010026251A1 (en) * 2008-09-05 2010-03-11 Birgit Riesinger Wound care article, comprising a portion of modified natural fibers or synthetic fibers
US20120209231A1 (en) 2009-11-06 2012-08-16 Basf Se Textiles containing improved superabsorbers
US20110184366A1 (en) * 2010-01-28 2011-07-28 Sca Hygiene Products Ab Highly absorbent pad with integrity and durability
SE533828C2 (en) 2010-03-19 2011-02-01 Assa Oem Ab Locking device with adjustable locking device
WO2013007973A2 (en) 2011-07-14 2013-01-17 Smith & Nephew Plc Wound dressing and method of treatment
GB2493960B (en) 2011-08-25 2013-09-18 Brightwake Ltd Non-adherent wound dressing
EP3354293B1 (en) 2012-05-23 2019-12-11 Smith & Nephew plc Apparatuses for negative pressure wound therapy
FR2993182B1 (en) 2012-07-13 2014-10-17 Urgo Lab DRESSING WITH PROLONGED RELEASE OF ASSETS
WO2014020443A2 (en) 2012-08-01 2014-02-06 Smith & Nephew Pcl Wound dressing and method of treatment
CA3178997A1 (en) 2012-08-01 2014-02-06 Smith & Nephew Plc Wound dressing
US20150328061A1 (en) * 2012-12-20 2015-11-19 Sca Hygiene Products Ab Absorbent article with increased comfortability
RU2618431C2 (en) * 2012-12-20 2017-05-03 Ска Хайджин Продактс Аб Absorbent article
AU2012397330B2 (en) * 2012-12-20 2016-12-22 Sca Hygiene Products Ab Absorbent article with increased comfortability
FR3003463B1 (en) 2013-03-20 2015-04-10 Urgo Lab DRESSING HAVING AN ADHESIVE PERIPHERAL EDGE WITH AN INUTED ROUND
WO2015193257A1 (en) 2014-06-18 2015-12-23 Smith & Nephew Plc Wound dressing
FR3048617B1 (en) 2016-03-08 2019-07-12 Urgo Recherche Innovation Et Developpement DRESSING SUITABLE FOR SENSITIVE SKIN
FR3053892A1 (en) 2016-07-12 2018-01-19 Urgo Recherche Innovation Et Developpement DRESSING FOR THE CONTROLLED AND PROLONGED RELEASE OF METFORMIN
GB2555584B (en) 2016-10-28 2020-05-27 Smith & Nephew Multi-layered wound dressing and method of manufacture
US11278457B2 (en) 2017-02-09 2022-03-22 Hill-Rom Services, Inc. Incontinence detection optimization using directional wicking

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4610678A (en) * 1983-06-24 1986-09-09 Weisman Paul T High-density absorbent structures
WO1990005808A1 (en) * 1988-11-17 1990-05-31 Sca Pulp Ab Easily defibered web-shaped paper product

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4327728A (en) * 1978-10-24 1982-05-04 Johnson & Johnson Baby Products Company Catamenial device with an absorbent layer having admixture of discrete superabsorbent and introfying particles
KR830005833A (en) * 1980-08-01 1983-09-14 로버트 엘, 마이니어 Low density tantalum plate manufacturing method
DK167952B1 (en) * 1983-03-10 1994-01-10 Procter & Gamble ABSORBENT STRUCTURE, WHICH IS A MIXTURE OF HYDROFILE FIBERS AND WATER-SOLUBLE HYDROGEL IN THE FORM OF SEPARATE PARTICLES OF CROSS-BOND POLUMED MATERIAL, PROCEDURE FOR THE PREPARATION OF SAME AND SINGLE PREPARATION
DE3664941D1 (en) * 1985-04-22 1989-09-14 Grain Processing Corp Non-laminated dry formed absorbent product
US4898642A (en) * 1986-06-27 1990-02-06 The Procter & Gamble Cellulose Company Twisted, chemically stiffened cellulosic fibers and absorbent structures made therefrom
US4822453A (en) * 1986-06-27 1989-04-18 The Procter & Gamble Cellulose Company Absorbent structure containing individualized, crosslinked fibers
IT1200283B (en) * 1986-08-06 1989-01-12 Mira Lanza Spa METHOD FOR THE DRY MANUFACTURE OF SHEET PRODUCTS CONTAINING A SUPERABSORBENT POLYMER MIXED WITH CELLULOSE FIBERS AND SHEET ABSORBING PRODUCTS SO OBTAINED
US5252275A (en) * 1991-03-07 1993-10-12 Weyerhauser Company Method of densifying crosslinked fibers
US5134007A (en) * 1988-05-24 1992-07-28 The Procter & Gamble Company Multiple layer absorbent cores for absorbent articles
US5038989A (en) * 1988-09-12 1991-08-13 Johnson & Johnson Inc. Apparatus for partially slitting absorbent boards
ES2108043T3 (en) * 1990-01-23 1997-12-16 Procter & Gamble ABSORBENT STRUCTURES CONTAINING A LAYER OF RIGIDIZED FIBERS THERMICALLY UNITED AND A LAYER OF SUPER ABSORBENT MATERIAL.
SE468744B (en) * 1991-01-29 1993-03-15 Moelnlycke Ab ABSORPTION BODY FOR ABSORPTION ALTERNATIVE INCLUDING AT LEAST TWO DIFFERENT FLUFF MASSES AND BLOW INCLUDING ABSORPTION BODY
NZ242947A (en) * 1991-07-19 1994-07-26 Johnson & Johnson Inc Non-defiberised fluid-absorbent sheet has debonding agent and cross linked fibres and method of manufacture

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4610678A (en) * 1983-06-24 1986-09-09 Weisman Paul T High-density absorbent structures
WO1990005808A1 (en) * 1988-11-17 1990-05-31 Sca Pulp Ab Easily defibered web-shaped paper product

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5843852A (en) * 1995-12-21 1998-12-01 Kimberly-Clark Worldwide, Inc. Absorbent structure for liquid distribution

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