EP1235643A1 - Structure absorbante intermediaire avec barriere imper-respirante integree - Google Patents

Structure absorbante intermediaire avec barriere imper-respirante integree

Info

Publication number
EP1235643A1
EP1235643A1 EP99959378A EP99959378A EP1235643A1 EP 1235643 A1 EP1235643 A1 EP 1235643A1 EP 99959378 A EP99959378 A EP 99959378A EP 99959378 A EP99959378 A EP 99959378A EP 1235643 A1 EP1235643 A1 EP 1235643A1
Authority
EP
European Patent Office
Prior art keywords
absorbent
layer
web
range
composite
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99959378A
Other languages
German (de)
English (en)
Inventor
Herbert Gerlach
Henning Roettger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Corovin GmbH
Korma SpA
Original Assignee
Corovin GmbH
Korma SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Corovin GmbH, Korma SpA filed Critical Corovin GmbH
Publication of EP1235643A1 publication Critical patent/EP1235643A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15203—Properties of the article, e.g. stiffness or absorbency
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • A61F13/51456—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its properties
    • A61F13/51458—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its properties being air-pervious or breathable
    • A61F13/51462—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its properties being air-pervious or breathable being defined by a value or parameter
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
    • B01J20/28004—Sorbent size or size distribution, e.g. particle size
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/28023—Fibres or filaments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/28026—Particles within, immobilised, dispersed, entrapped in or on a matrix, e.g. a resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/2803—Sorbents comprising a binder, e.g. for forming aggregated, agglomerated or granulated products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/28033—Membrane, sheet, cloth, pad, lamellar or mat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/2805—Sorbents inside a permeable or porous casing, e.g. inside a container, bag or membrane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/04—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres having existing or potential cohesive properties, e.g. natural fibres, prestretched or fibrillated artificial fibres
    • D04H1/08—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres having existing or potential cohesive properties, e.g. natural fibres, prestretched or fibrillated artificial fibres and hardened by felting; Felts or felted products
    • D04H1/10—Felts made from mixtures of fibres
    • D04H1/14—Felts made from mixtures of fibres and incorporating inorganic fibres
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H13/00—Other non-woven fabrics
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/02—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/12—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with filaments or yarns secured together by chemical or thermo-activatable bonding agents, e.g. adhesives, applied or incorporated in liquid or solid form
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15203—Properties of the article, e.g. stiffness or absorbency
    • A61F2013/15284—Properties of the article, e.g. stiffness or absorbency characterized by quantifiable properties
    • A61F2013/15544—Permeability
    • A61F2013/15552—Air permeability
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • A61F13/51401—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by the material
    • A61F2013/51409—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by the material being a film
    • A61F2013/51437—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by the material being a film being integral with absorbent core
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/726—Permeability to liquids, absorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/728—Hydrophilic

Definitions

  • This invention relates to intermediate absorbent structures comprising an upper layer that is liquid permeable, a lower layer and an intermediate layer arranged between said upper layer and said lower layer, said intermediate layer comprising absorbent material preferably comprising superabsorbent polymer in the form of particles or small fibers dispersed between said upper layer and said lower layer, and optionally comprising a thermoplastic bonding agent, wherein said absorbent core is produced as part of a continuous web of absorbent cores, wherein the width of said continuous web is approximately equivalent to the width of a multiple number of cores, wherein said absorbent material is deposited in a defined pattern, as defined in the preamble of patent claim 1.
  • Intermediate absorbent structures as defined in the preamble of claim 1 are known from EP 0 708 628 Bl. Intermediate absorbent structures of this type serve to provide, by means of an off-line process, intermediate multilayer absorbent structures and products, incorporating powders or fibers or granules of absorbent material, which products may also be of small size, with a maximum design flexibility and without appreciable additional costs from modifying the shape or the structure of the absorbent article.
  • absorbent structure refers to disposable absorbent articles for personal or medical care, such as catamenial devices, incontinence devices, diapers, dressings and the like. They may also be used for household or industrial applications, such as cleaning devices.
  • Intermediate structures are manufactured in the form of a continuous web that can be converted into absorbent articles. In final absorbent articles, said absorbent structures are often covered by an external covering material .
  • absorbent products such as catamenial devices, incontinence devices, diapers, dressings and the like are the acquisition, storage and containment of fluids. Additional demands include providing comfort or minimizing discomfort, and maintaining skin health. Efforts to respond to the basic demands have led to the creation of a variety of multilayer articles ranging from simple fluff-pulp structures, for example as disclosed in US Pat. No. 4,223,677 to Anderson or US Pat. No. 3,768,480 to Repke and Mesek, to com- plex structures containing several layers of different types of materials, for example as disclosed in US Pat. No. 5,246,429 to Poccia et al .
  • absorbent article designs include a fluid permeable surface material to be placed adjacent to the site of fluid discharge, a fluid storage core, and a fluid impervious surface external to the storage core.
  • a fluid permeable surface material to be placed adjacent to the site of fluid discharge
  • a fluid storage core and a fluid impervious surface external to the storage core.
  • a fluid impervious surface external to the storage core included in absorbent article designs.
  • Early designs of, for example, catamenial pads contained as few as two different materials, the inner pulp storage core and the outer tissue wrap.
  • Recent developments of improved formulations of absorbent articles have resulted in more complex multilayer, multicomponent articles that may include superabsorbent materials in the form of particles, powder or fibers.
  • a variety of forms and configurations of superabsorbent materials and fibrous materials as storage cores in absorbent articles are known in the art .
  • nonwoven materials to absorbent articles has permitted progressive improvements in absorbent product design, notably with respect to materials used for the layers external to the article's storage core.
  • diaper topsheet material has progressed from simple tissue with relatively poor strength and rewet properties to more durable synthetic non- woven webs with improved fluid transfer capability.
  • a key challenge for absorbent articles is to permit fluid transport within the core while preventing transmission of fluid from the core to the external layer of the article and exiting the article.
  • a layer of an absorbent article that lies external to the core must generally constitute a barrier with low fluid permeability as disclosed in US Pat. No. 4,578,069 to hitehead and Braun.
  • said fluid barrier layer was composed of a liquid impermeable, air impermeable film.
  • an impervious barrier layer can result in significant discomfort due to entrapment of heat and moisture, that in extreme cases can lead to skin irritation and injury.
  • breathable interfaces include thin films, porous films, film- nonwoven composites, and nonwoven laminates, as disclosed for example in US Pat. No. 4,777,073 to Sheth, European Pat. No. 0352802 to Antoon and Hill, US Pat. No. 4,818,600 to Braun et al., and European Pat. No.
  • a secondary fluid barrier may be incorporated internal to a primary fluid barrier with the in- tention of ensuring that failure of the primary barrier does not lead to leakage from the core .
  • absorbent articles where a vapor permeable fluid barrier for an absorbent article is placed between the absorbent core and the back- sheet or external cover of the article include the inventions disclosed in US Pat. No. 5,879,341 to Odorzynski and Sherman, in US Pat. No. 5,643,239 to Bodford and Nayak, and in German Pat. DE3717992 to Haegler and Huebner.
  • a breathable barrier between an absorbent core and a breathable liquid impervious external cover is also disclosed in WO 98/27920 to Strack et al . , with reference to absorbent articles having reduced outer cover dampness.
  • this secondary barrier approach involves additional converting steps during absorbent article production.
  • absorbent articles can be simplified and rendered more economical through the use of intermediate absorbent products.
  • Such intermediate products may constitute, for example, the absorbent storage core of a personal care article, as disclosed in European Pat. No. 0 648 101 to Palumbo and Carlucci.
  • Other examples of intermediate absorbent articles are disclosed in European Pat. No. 0 729 735 to Helyranta et al . , and European Pat. No. 0 463 716 to Makoui .
  • the production of intermediate absorbent articles can be rendered even more practical and economical by producing a continuous web of cores the width of more than one core, as disclosed in EP 708 628 Bl.
  • the advantage of the known intermediate absorbent articles is the simplification of final article production and the vari- ety of final products possible from a standardized intermediate core.
  • an intermediate absorbent structure as defined in the preamble of claim 1 is characterised in that the lower layer the lower layer has a hydrohead greater than 8 cm and an air permeability less than 1000 m/s at 196 Pa, and that is comprising material selected from the group of microporous films, thin nonporous films, film- nonwoven composites, and composites of fine fibers and continuous filaments.
  • a lower layer consisting of a material which is fluid impermeable but water vapor permeable. This material may be a synthetic film, a nonwoven or a film-nonwoven composite.
  • the backsheet material or an external covering of the final product may now be made of less expensive materials and of materials having better characteristics for the user, respectively.
  • a fluid barrier into an intermediate absorbent structure will contribute to the simplification of absorbent article production and will provide more freedom in the formulation of external layers, particularly where improved air permeability is desirable.
  • Such a core-integrated fluid barrier will also provide more flexibility in the design of external layers with specific esthetic properties, such as color, hand, loudness and the like.
  • materials having these properties are used as back- sheet material for diapers and similar disposable absorbent articles for personal or medical use. Due to the fact, that these materials were already in use, it has been common practice not to include these materials in manufacturing absorbent structures as intermediate products .
  • a fluid impermeable barrier that is integrated into the intermediate absorbent structure of an absorbent article also eliminates the need for a secondary external layer to act as a back-up in case of failure of the external layer.
  • the use of a core with an integrated barrier could also permit a reduction in the amount or thickness of absorbent materials in the core, thereby improving the wearing comfort of the finished article.
  • a layered intermediate absorbent structure comprising a breathable barrier composite will be produced according to the teachings of EP 0 708 628 Bl, incorporated herein in its entirety by reference.
  • Hydrostatic head can be evaluated using Edana Recommended Test Method (RTM) 160.0-89 for Nonwovens Wet Barrier.
  • Air permeability can be measured according to Edana RTM 140.1-99 for Nonwovens Air Permeability amended such that the pressure drop is 196 Pa (as in Edana RTM 140.1-81) instead of 200 Pa.
  • Said liquid permeable upper layer is selected from the group woven fabric, nonwoven fabric, synthetic film, tissue paper, air laid paper, air laid composites, and composites of fine fibers and continuous filaments.
  • the upper layer comprises air laid cellulose fibers with a basis weight in the range 20-1000 g/m 2 , preferably in the range 20- 500 g/m 2 . Basis weight can be evaluated according to Edana RTM 40.3-90 for Nonwovens Mass per Unit Area.
  • the material of the upper layer may comprise 50-100 % cellulose.
  • the upper layer may comprise at least 1% synthetic materials selected from the group polyolefins, polypropylene, polyethylene, polyamides and polyesters.
  • the layer of absorbent material comprises material selected from the group absorbent gelling material, absorbent particles, superabsorbent particles, absorbent fibers and superabsorbent fibers.
  • the absorbent material can be either a single absorbent material or a blend of absorbent materials, comprising material that is capable of turning into a gel upon being wetted, and thus retaining large amounts of fluid with respect to its own original volume.
  • Preferred materials in this respect are the so-called superabsorbent polymers or SAP, in the form of particles, powders or fibers, however, according to the invention other known absorbent materials can be used, both in powder and fiber form. A variety of such materials are known to the art.
  • said layer comprises superabsorbent gelling material in the form of particles.
  • the absorbent material may comprise material with an odor absorbing or odor controlling function such as, for example, zeolites, silica, carbon or pH-regulating material.
  • the basis weight of the deposited absorbent material, measured in the product and with respect to the deposited areas, is preferably from 10 to 1000 g/m 2 .
  • Said absorbent material may be deposited as a single layer or as multiple layers between the upper and lower layers of the article.
  • an absorbent composite may be formed by the mixing of absorbent material with accompanying supporting fibers comprising natural or synthetic fibers, and optionally including bicomponent binder fibers, as may be formed using conventional air laid technology.
  • the lower layer comprises a composite of fine fibers and continuous filaments with a total basis weight of fine fibers in the range 2 to 40 g/m 2 , and a total basis weight of continuous filaments in the range 8 to 48 g/m 2 .
  • said composite of fine fibers and continuous filaments comprises a spunbond- meltblown composite with a spunbond layer with a basis weight in the range 4 to 24 g/m 2 and a meltblown layer with a basis weight in the range 2 to 20 g/m 2 .
  • Alternative composite compositions are a spunbond layer with a basis weight in the range 10 to 20 g/m 2 and a meltblown layer with a basis weight in the range 2 to 12 g/m 2 , or a spunbond layer with a basis weight in the range 2 to 9 g/m 2 and a meltblown layer with a basis weight in the range 1 to 2 g/m 2 .
  • the composite of fine fibers and continuous filaments comprises at least one spunbond layer and at least one meltblown layer.
  • the material of the lower layer is selected from the group polyolefins, polypropylene, polyethylene, polyamides and polyesters, most preferably from the group polyethylene and polypropylene .
  • the spunbond- meltblown composite of the lower layer is manufactured using a forming line that comprises at least one station for the melt extrusion of continuous filaments and at least one station for the melt extrusion of fine fibers.
  • the line preferably comprises one continuous filament station and one fine fiber station, the fine fiber station preferably lying downline from the continuous filament station.
  • the continuous filaments are formed by the extrusion of molten polymer through spinnerets followed by the drawing of the filaments and the depositing of the filaments in a random fashion on a moving belt. Fine fibers produced by the meltblown technique are then deposited onto the continuous filament layer in a random fashion. Downline of the extrusion stations, the composite is intermittently bonded using a heated calender. Rolling and possibly slitting of the composite may follow bonding.
  • an intermediate absorbent structure 1 comprising an upper layer 2 and a lower layer 3 and an intermediate layer 4.
  • Said intermediate layer 4 is closely enveloped in between the upper layer 2 and the lower layer 3.
  • Upper layer 2 and lower layer 3 are bonded together by adhesive strips 5.
  • the physical properties of lower layer 3 are differing from the physical properties of upper layer 2, as described above.
  • the absorbent core with integrated fluid barrier of this invention may be used in a variety of final absorbent articles such as for example catamenial pads, diapers, incontinence devices, wound dressings and in other applications or products not disclosed in the preceding description, particularly in final articles comprising a backsheet or external covering with significant air permeability.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Textile Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Vascular Medicine (AREA)
  • Biomedical Technology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Epidemiology (AREA)
  • Dermatology (AREA)
  • Inorganic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Laminated Bodies (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)

Abstract

Cette invention se rapporte à une structure absorbante intermédiaire améliorée ayant une barrière anti-fluides perméable à l'air intégrée, cette structure étant destinée à être intégrée à l'intérieur d'au moins une couche externe de l'article absorbant fini et à éliminer la nécessité de placer une barrière anti-fluides secondaire entre l'âme absorbante et la couche externe. Cette structure est fabriquée sous la forme d'une nappe continue qui peut être transformée en articles absorbants jetables. La structure faisant l'objet de cette invention comprend: (a) une couche supérieure imperméable aux liquides (b), une couche inférieure résistant à une colonne d'eau supérieure à 8 cm et ayant une perméabilité à l'air inférieure à 1000 m/s à 196 Pa, et (c) une couche intermédiaire de matériau absorbant placée entre la couche supérieure et la couche inférieure. Dans les modes de réalisation préférés, la couche inférieure des structures intermédiaires comprend un composite de fibres fines et de filaments continus.
EP99959378A 1999-12-03 1999-12-03 Structure absorbante intermediaire avec barriere imper-respirante integree Withdrawn EP1235643A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP1999/009491 WO2001039880A1 (fr) 1999-12-03 1999-12-03 Structure absorbante intermediaire avec barriere imper-respirante integree

Publications (1)

Publication Number Publication Date
EP1235643A1 true EP1235643A1 (fr) 2002-09-04

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EP (1) EP1235643A1 (fr)
AU (1) AU1657200A (fr)
WO (1) WO2001039880A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE102006000782A1 (de) * 2006-01-04 2007-07-05 Johnson & Johnson Gmbh Absorbierendes mehrlagiges Verbundvlies
CN101484639B (zh) * 2006-09-04 2011-04-13 博爱（中国）膨化芯材有限公司 一种具有液体吸收性能的无尘纸及其制造工艺

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Publication number Priority date Publication date Assignee Title
IT1257251B (it) * 1992-07-03 1996-01-10 Gianfranco Palumbo Struttura assorbente sottile stratificata, articolo assorbente comprendente tale struttura e relativo procedimento di fabbricazione
AU682191B2 (en) * 1993-05-20 1997-09-25 Kimberly-Clark Worldwide, Inc. Lightweight nonwoven web laminates with improved comfort and barrier properties
IT1272480B (it) * 1993-07-21 1997-06-23 Korma S R L Ora Korma S P A Procedimento e apparecchiatura per fabbricare prodotti assorbenti intermedi, prodotti cosi' ottenuti, e articoli assorbenti finiti che impiegano questi prodotti.
IT1261155B (it) * 1993-12-31 1996-05-09 P & G Spa Struttura assorbente stratificata, articolo assorbente comprendente tale struttura e metodo per la sua realizzazione.
US6114596A (en) * 1995-11-03 2000-09-05 Polybond, Inc. Breathable disposable sanitary product construction and barrier sheet
EP0811388A1 (fr) * 1996-06-07 1997-12-10 The Procter & Gamble Company Articles absorbants sans charbon actif contenant un système de contrÔle des odeurs à base de silice et de zéolite
DE69619992T2 (de) * 1996-12-04 2002-11-21 The Procter & Gamble Company, Cincinnati Verfahren zur Herstellung von geschichteten und teilchenförmiges Material enthaltenden Strukturen, sowie nach dem Verfahren hergestellte Struktur
ATE258851T1 (de) * 1996-12-06 2004-02-15 Weyerhaeuser Co Einteiliger verbundschichtstoff
AR016248A1 (es) * 1998-05-01 2001-06-20 Dow Global Technologies Inc Metodo para fabricar capas o laminas fibrosas por soplado en fusion, las laminas o capas de material asi obtenidas

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Also Published As

Publication number Publication date
AU1657200A (en) 2001-06-12
WO2001039880A1 (fr) 2001-06-07

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