WO2004113608A2 - Airlaidverfahren mit verbessertem durchsatz - Google Patents

Airlaidverfahren mit verbessertem durchsatz Download PDF

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Publication number
WO2004113608A2
WO2004113608A2 PCT/EP2004/006441 EP2004006441W WO2004113608A2 WO 2004113608 A2 WO2004113608 A2 WO 2004113608A2 EP 2004006441 W EP2004006441 W EP 2004006441W WO 2004113608 A2 WO2004113608 A2 WO 2004113608A2
Authority
WO
WIPO (PCT)
Prior art keywords
fibers
short
short fibers
nonwoven fabric
weight
Prior art date
Application number
PCT/EP2004/006441
Other languages
German (de)
English (en)
French (fr)
Other versions
WO2004113608A3 (de
Inventor
Alexander SCHMIDT-FÖRST
Franz Aschenbrenner
Original Assignee
Hakle-Kimberly Deutschland Gmbh
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 Hakle-Kimberly Deutschland Gmbh filed Critical Hakle-Kimberly Deutschland Gmbh
Priority to AU2004249862A priority Critical patent/AU2004249862B2/en
Priority to MXPA05013207A priority patent/MXPA05013207A/es
Priority to EP04739911A priority patent/EP1633923A2/de
Priority to JP2006515941A priority patent/JP4792391B2/ja
Priority to BRPI0411471-0A priority patent/BRPI0411471A/pt
Priority to US10/561,131 priority patent/US20070266503A1/en
Priority to CA002528421A priority patent/CA2528421A1/en
Publication of WO2004113608A2 publication Critical patent/WO2004113608A2/de
Publication of WO2004113608A3 publication Critical patent/WO2004113608A3/de
Priority to KR1020057024052A priority patent/KR101121362B1/ko

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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
    • D06M13/10—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing oxygen
    • D06M13/165—Ethers
    • D06M13/17—Polyoxyalkyleneglycol ethers
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15577—Apparatus or processes for manufacturing
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
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    • 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
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    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
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    • D04H1/4258—Regenerated cellulose series
    • D—TEXTILES; PAPER
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    • 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
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    • D04H1/4326—Condensation or reaction polymers
    • D04H1/435—Polyesters
    • 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
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    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4374—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece using different kinds of webs, e.g. by layering webs
    • 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
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    • D04H1/43825—Composite fibres
    • D04H1/43828—Composite fibres sheath-core
    • 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
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    • D04H1/43835—Mixed fibres, e.g. at least two chemically different fibres or fibre blends
    • 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
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    • D—TEXTILES; PAPER
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
    • D06M13/10—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing oxygen
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    • D06M13/2243—Mono-, di-, or triglycerides
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
    • D06M13/322—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing nitrogen
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    • D06M13/473—Compounds containing quaternary nitrogen atoms derived from heterocyclic compounds having five-membered heterocyclic rings
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
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    • D06M7/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made of other substances with subsequent freeing of the treated goods from the treating medium, e.g. swelling, e.g. polyolefins
    • A—HUMAN NECESSITIES
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    • A61F2013/15943—Apparatus or processes for manufacturing characterized by the apparatus for manufacturing for making non-woven by air-laid technique
    • C—CHEMISTRY; METALLURGY
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    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/46—Textile oils
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
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    • D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
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    • D06M2101/04—Vegetal fibres
    • D06M2101/06—Vegetal fibres cellulosic
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
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    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2509/00—Medical; Hygiene
    • D10B2509/02—Bandages, dressings or absorbent pads
    • D10B2509/026—Absorbent pads; Tampons; Laundry; Towels

Definitions

  • the present invention relates to a process for producing a nonwoven fabric by an areodynamic process (hereinafter “airlaid process”), a nonwoven fabric produced by the process, and a short fiber suitable for use in the process.
  • airlaid process an areodynamic process
  • Figure 1 is a graph showing the dependence of the throughput on the humidity
  • Figure 2 is a graph showing the dependence of the throughput on the finish quantity.
  • the present invention thus relates to a process for producing a nonwoven fabric, comprising the laying down of at least one layer comprising short fibers by an airlaid process, at least some of the short fibers having a finish in an amount of greater than 0.035% by weight, based on the fiber weight the finish-containing short fibers.
  • a fiber fleece is understood to mean a layer of fibers which comprises short fibers, the fibers not being arranged regularly.
  • Short fibers are defined herein as fibers with a length in the range of 2 to 12 mm.
  • the term short fibers as used herein denotes all short fibers used in the process, to the exclusion any binding short fibers and superabsorbent short fibers that may be present.
  • a "layer comprising short fibers” is understood here to mean a layer in which the fibers which essentially form the layer are short fibers, but additional materials, such as binding materials, superabsorbents, etc. , may be in the form of longer fibers or in a form other than fibers.
  • the short fibers generally make up more than 50% by weight, typically more than 60% by weight, of the layer.
  • Short fibers plus short bond fibers and / or superabsorbent short fibers generally make up more than 90% by weight, typically more than 95% by weight of the layer.
  • the short fibers are provided with the finish.
  • at least 5% by weight of the short fibers are provided with the finish, preferably at least 10% by weight, such as at least 25% by weight, for example at least 50% by weight.
  • fiber mixtures e.g. preferably more than 25%, in particular more than 50%, for example all of the short fibers whose throughput is problematic, such as viscose fibers, provided with the finish, while the short fibers which can be used without problems have no finish.
  • essentially all of the short fibers used in the airlaid process can be provided with the finish.
  • a binding material is also deposited in addition to the short fibers.
  • Binder material is generally understood here to mean materials which, owing to their dissolving or melting properties, can cause the short fibers to bond to one another.
  • the binders have any shape as long as this is compatible with the use in an airlaid process, for example powder, etc.
  • the binder materials are preferably also short fibers, i.e. Binding short fibers.
  • fibers which can be used as binder fibers because of their solvent properties are polyvinyl alcohol fibers (PVA fibers) and 'alginate fibers.
  • Fibers because of their Thermal properties that are suitable as binding fibers are generally hot-melt adhesives or fibers comprising a thermoplastic material that has a lower softening temperature than the fibers to be bound.
  • Melt binding fibers can be used as full profile fibers or multi-component fibers.
  • a preferred melt binding fiber is a two-component fiber (BIKO fiber), for example a two-component fiber with a fiber jacket made of a polymer, which has a lower melting point than the polymer of the fiber core.
  • BIKO fiber two-component fiber
  • An example of this is a two-component fiber, comprising a polyester core and a polyethylene jacket.
  • short binding fibers denotes fibers with a length in the range of 2-12 mm, preferably of 4-8 mm.
  • the short binding fibers generally have a length-to-weight ratio of 1.0 to 6.0 dtex, preferably 2.0 to 4.0 dtex, for example approximately 3.0 dtex.
  • the binder is used in an amount that is ultimately dictated by the desired properties of the final product. Parameters that thus influence the amount of binder are therefore both the type of binder and the type of fibers or fiber mixture to be bonded, as well as the intended strength, softness / rigidity and weight per unit area of the end product, etc. In general, the amount is of binder 1-30 wt .-%, based on the total weight of the short fibers to be bound and the binder, in particular 1-20 wt .-%, such as 3-10 wt .-%, for example 5-8 wt .-%.
  • the short fibers preferably have a moisture content in the range of 4-16%, in particular 6-14%, for example 8-12%. Moisture is measured according to the method described below.
  • Short fibers which are suitable for use in the method according to the invention essentially comprise all fiber types known in the art, ie natural fibers, cellulosic chemical fibers, synthetic fibers and inorganic fibers and combinations from that.
  • natural fibers include natural vegetable fibers, such as fibers made from cellulose, cotton, jute, flax, hemp and coconut, and natural animal fibers, such as wool and silk.
  • Cellulosic chemical fibers include regenerated cellulose fibers, such as viscose fibers, cupro fibers and lyocell fibers.
  • Synthetic fibers include, for example, polyolefin fibers, polyester fibers and polyamide fibers
  • inorganic fibers include glass fibers, silicate fibers, carbon fibers, boron fibers and metal fibers.
  • Preferred types of fibers for use in the method according to the invention are natural fibers, in particular vegetable natural fibers and cellulosic chemical fibers, in particular cellulose fibers, cotton fibers, viscose fibers and lyocell fibers.
  • the method of the present invention was originally developed with a view to using a high proportion of viscose fibers.
  • the short fibers thus comprise short viscose fibers, at least some of the short viscose fibers being provided with the finish. Preferably at least 20%, more preferably at least 50%, of the short viscose fibers are provided with the finish. For example, the entire short viscose fibers are finished.
  • the viscose short fibers advantageously have a multi-section, such as a three-section.
  • Such fibers are known in the art, see e.g. U.S. Patent No. 5,643,914, the contents of which are incorporated by reference in their entirety.
  • Three-section cross-section fibers are e.g. can be seen from Figures 1-5 of this document.
  • the viscose fibers are usually present in an amount of greater than 85% by weight, based on the total weight of the short fibers, in particular in an amount of greater than 90% by weight, such as greater than 95% by weight.
  • the short fibers are by definition in the range of 2-12 mm, and preferably in the range of 4-8 mm, such as 5-6 mm.
  • the short fibers have a length to weight ratio of 1.0 to 6.0 dtex, preferably 2.0 to 4.0 dtex, for example about 3.3 dtex.
  • a superabsorbent material is also deposited in the method according to the invention.
  • Superabsorbers SAP
  • SAPs usually consist of polymers based on acrylates and are characterized in that they can absorb several times their own weight in liquid.
  • the superabsorbent materials are used in the process according to the invention in any suitable form which is compatible with the airlaid process, for example in the form of granules, preferably in the form of fibers, in particular short fibers with a length in the range from 2-12 mm, in particular from 4- 8 mm.
  • the amount of superabsorbent material is generally 0.1-50% by weight, in particular 5-10% by weight, based on the weight of the short fibers (excluding any binding short fibers that may be present).
  • finish is present in an amount greater than 0.035% by weight, based on the weight of the short fibers provided with the finish.
  • finish quantity is understood to mean the amount actually present on the fiber according to the information of the fiber manufacturer.
  • the quantity values mentioned in this description thus relate to analysis values of the fiber manufacturer (Acordis), as determined by Soxleth extraction, derivalization (methylation) of the sample, gas-atographic separation and detection by means of a flame ionization detector.
  • the amount of finish is preferably greater than 0.05% by weight, more preferably greater than 0.10% by weight, most preferably greater than 0.15% by weight.
  • the upper limit of the finish quantity is the quantity at which a further increase in the throughput, for example due to other limiting process parameters, no longer makes sense, the throughput is already almost optimal and further costs for more finish do not seem justified, or the high amount of finish leads to or contributes to undesirable product properties. The maximum amount is therefore dependent on the airlaid system used, the short fibers or short fiber mixtures used as well as on the end product and its desired properties.
  • the maximum amount of finish based on the weight of the short fibers provided with the finish, is 1% by weight, in particular 0.75% by weight, for example 0.50% by weight. Analog finish quantities are assumed for other types of fibers.
  • finish is preferably selected from:
  • R1 is independently a saturated or unsaturated hydrocarbon radical with 12-22, in particular 14-20 carbons, which may optionally have one or more free hydroxyl groups, o and p are independently 0 or 1, m is 0 or Is 1 and n is 1-15, preferably 3-11, in particular 4-7,
  • the imidazolium ethosulfates or methosulfates generally have a structure according to the general formula (I) below
  • R2 is H or a C1-C6 alkyl radical
  • R3 independently of each other is a saturated or unsaturated hydrocarbon radical with 6-22 carbon atoms, which may optionally have one or more free hydroxyl groups
  • R4 is methyl or ethyl
  • r is 2, 3 or 4
  • s is 0 or 1.
  • R2 and R3 are defined as in the first preferred embodiment, and s is 0.
  • R2 is methyl or ethyl, more preferably methyl
  • R3 is independently a hydrocarbon residue with 6-12 in each occurrence Carbon atoms, r is 2 and s is 1.
  • R3 is an alkyl radical.
  • Examples of ethylene oxide derivatives are the diesters of lauric acid, palmitic acid, oleic acid and / or stearic acid with polyethylene glycol with an average molecular weight of, for example, 400 or 600.
  • Examples of sorbitan esters are ethoxylated derivatives of sorbitan monoesters, diesters and triesters with lauric acid, palmitic acid, oleic acid and / or stearic acid.
  • An example of the glyceride derivatives is hydrogenated, ethoxylated castor oil, and examples of the imidazolium derivatives are Rewoguat ® W75 and Rewoquat ® W90 from Degussa.
  • the improvement in throughput through the use of short fibers, at least part of which is finished, is preferably at least 20%, more preferably at least 50% and most preferably at least 100%, compared to the same short fibers, but without that Finish.
  • the invention is optionally combined with further steps to form a fiber layer, in particular a nonwoven fabric. Accordingly, the method according to the invention can be carried out in such a way that the layer which forms is deposited on a previously formed fiber layer.
  • the previously formed fiber layer can be, for example, a layer formed by an airlaid process, or a layer formed by another process, for example a spunbond or meltblown layer, or a combination of such layers.
  • the method according to the invention can include the deposition of several layers, for example the deposition of two or three layers, optionally in combination with one or more other layers, as explained above.
  • One or more other layers, as explained above, can be deposited on the (uppermost) layer according to the invention.
  • the nonwoven fabric Following the formation of the nonwoven fabric according to the invention, this can be subjected to further process steps.
  • Such steps include, for example, heat treatment, especially if thermoplastic binder fibers were used.
  • the heat treatment comprises heating the nonwoven fabric to a temperature above the softening temperature of the binding fiber or the lowest melting component of the binding fiber, for a sufficient period of time to at least partially melt the fiber or component to reach.
  • Other optional process steps include compacting, embossing, printing, etc.
  • Another object of the present invention is a nonwoven fabric produced by the method according to the invention. Accordingly, the present invention also provides a nonwoven fabric comprising at least one layer comprising short fibers, at least some of the short fibers having a finish in an amount of greater than 0.035% by weight, based on the fiber weight of the finish-containing short fibers.
  • the layer comprises short fibers in an amount of 70-99% by weight and binding material in an amount of 1-30% by weight, based on the total weight of short fibers and binding material.
  • the binding material is as explained above in relation to the method according to the invention, and preferably comprises short binding fibers, in particular multicomponent fibers, such as, for example, two-component fibers, comprising a polyester core and a polyethylene jacket.
  • Short binding fibers generally have a length-to-weight ratio of 1.0 to 6.0 dtex, preferably 2.0 to 4.0 dtex.
  • the short fibers are as explained above in relation to the method according to the invention, and preferably comprise natural fibers, in particular vegetable natural fibers and cellulosic chemical fibers, in particular cellulose fibers, cotton fibers, viscose fibers and lyocell fibers.
  • the layer of the nonwoven fabric according to the invention comprises short viscose fibers, at least some of which are provided with the finish. Preferably at least 20%, more preferably at least 50%, of the short viscose fibers are provided with the finish. For example, the entire short viscose fibers are finished.
  • the viscose short fibers advantageously have a multi-section, such as a three-section.
  • the viscose fibers are usually present in an amount of more than 85% by weight, based on the total weight of the short fibers, in particular in an amount of more than 90% by weight, such as more than 95% by weight.
  • the short fibers are exclusively viscose short fibers.
  • the short fibers are by definition in the range of 2-12 mm, and preferably in the range of 4-8 mm, such as 5-6 mm. In general, the short fibers have a length to weight ratio of 1.0 to 6.0 dtex, preferably 2.0 to 4.0 dtex, for example about 3.3 dtex.
  • the layer optionally comprises a superabsorbent material (SAP), preferably in the form of fibers, in particular short fibers, with a length in the range of 2-12 mm, in particular 4-8 mm. If used, the amount of superabsorbent material is generally 0.1-50% by weight, in particular 5-10% by weight, based on the weight of the short fibers.
  • SAP superabsorbent material
  • the finish is in an amount of greater than 0.035% by weight, preferably greater than 0.05% by weight, more preferably greater than 0.10% by weight, most preferably greater than 0 , 15% by weight, and at most in an amount of 1% by weight, in particular 0.75% by weight, for example 0.50% by weight.
  • These quantities refer to the weight of the short fibers provided with the finish.
  • the finish is as discussed above in connection with the method according to the invention.
  • the nonwoven fabric according to the invention optionally comprises several layers according to the invention and / or other layers, as explained above.
  • the layer comprising short fibers of the nonwoven fabric according to the invention generally has a basis weight of 50-350 g / m2, typically 75-250 g / m 2, in particular 150-220 g / m2. such as about 180 g / m2.
  • the density of the layer is generally from 0.02-0.5 g / cm3, typically from 0.03-0.2 g / cm3, in particular from 0.04-0.1 g / cm3.
  • the above values relate to the material web as deposited in the airlaid process, before carrying out compacting process steps, such as calendering or embossing.
  • the density is determined according to standard methods, under a load of 0.2 kPa.
  • the short fiber layer of the nonwoven fabric according to the invention generally has an absorbency of at least 3 g / g nonwoven fabric, preferably at least 4 g / g, particularly preferably at least 4.8 g / g.
  • the absorbency is measured according to the well-known Syngina-Test ("Syn- gina Absorbancy Test") and in the absence of superabsorbent materials.
  • Yet another object of the present invention is a short fiber which is provided with a finish in an amount greater than 0.035% by weight, based on the weight of the fiber.
  • the short fiber is a chemical cellulose fiber or a synthetic fiber.
  • the short fiber is a viscose fiber, which may have a multi-section, such as a three-section.
  • the short fiber has a length in the range of 2-12 mm, and preferably a length in the range of 4-8 mm, such as 5-6 mm.
  • the short fiber has a length-to-weight ratio of 1.0 to 6.0 dtex, preferably 2.0 to 4.0 dtex, for example approximately 3.3 dtex.
  • the finish is present in an amount greater than 0.035 weight percent, preferably greater than 0.05 weight percent, more preferably greater than 0.10 weight percent, most preferably greater than 0.15 weight percent, and at most in an amount of 1% by weight, in particular 0.75% by weight, for example 0.50% by weight.
  • Suitable finish materials are those explained above in connection with the method according to the invention.
  • Yet another object of the present invention is the use of a short fiber as described above in an airlaid process.
  • Yet another object of the present invention is an absorbent object comprising a nonwoven fabric produced by the method according to the invention, or a nonwoven fabric as described above.
  • the absorbent article has an absorbency of at least 3 g / g nonwoven, preferably at least 4 g / g, particularly preferably at least 4.8 g / g, as measured by the Syngina test.
  • the absorbent article is, for example, a personal hygiene article, such as a tampon, a sanitary napkin, a diaper or an incontinence article, or a household article, industrial article or medical article.
  • a personal hygiene article such as a tampon, a sanitary napkin, a diaper or an incontinence article, or a household article, industrial article or medical article.
  • the absorbent object according to the invention is a tampon which comprises a spiral winding of a layer comprising short fibers according to the invention.
  • the layer comprises 60-100% by weight three-part viscose short fiber and 0-40% by weight short cellulose fiber, based on the total weight of the short fibers.
  • the short cellulose fiber and the short viscose fiber have a length of 4-8 mm, preferably about 6 mm and a length-to-weight ratio of 3-4 dtex.
  • the layer further comprises 5-15% by weight of a BIKO short fiber, based on the total weight of short fibers and short fibers.
  • the tampon has an absorption capacity of at least 4 g / g under load, a rigidity of at least 20N and an expansion capacity of at least 150%.
  • a fiber sample (approx. 5 g) is placed in the container, the container is closed with the lid in a water vapor-tight manner and weighed with an accuracy of ⁇ 0.005 g.
  • the value GRT (weight at room temperature) is noted.
  • the lid of the container is removed and the container and lid are placed in a hot air oven at a temperature of 105 ⁇ 3 ° C.
  • Drying is carried out for at least three hours, for example overnight. The oven must not be opened during the drying period.
  • the containers are sealed in a water vapor-tight manner with the lids in the oven.
  • the sealed container is weighed at the same temperature at which the GJJ was measured. The value is noted as GJJ (hot weight).
  • fibers with the specification given in Table 1 were produced.
  • the finish used was polyglycol palate stearate ester.
  • the fibers were then used to produce airlaid nonwovens using a Danweb airlaid system with 4 laying heads and a laying width of 600 mm.
  • the system is suitable for multibonding as well as for the production of latex-bound and thermally bound products.
  • the bore diameter of the laying heads was 4.5 mm.
  • the fibers of samples 1-5 were combined with a binding fiber Trevira T255 (P ⁇ T / PE) with a length-to-weight ratio of 3.0 dtex and a length of 6 mm, in a weight ratio of rayon fiber : 93: 7 binding fiber used.
  • the ambient conditions were 23 ° C and 73% relative air humidity, the target weight per unit area was 180-220 g / m.2, with a density of 0.04 g / cm3.
  • the maximum amount of fibers that are transported through the laying heads without blocking them is determined.
  • the basis weight must remain stable, with a maximum deviation of ⁇ 10% from the target value both in the machine direction and in the transverse direction.
  • the maximum capacity is the maximum fiber quantity supplied to the laying heads per unit of time, measured on the fiber metering device.
  • test was carried out successively with samples 1-5, the moisture and / or finish values being increased from test to test so as to avoid contamination of the system by fibers with a higher moisture content or amount of finish.
PCT/EP2004/006441 2003-06-16 2004-06-15 Airlaidverfahren mit verbessertem durchsatz WO2004113608A2 (de)

Priority Applications (8)

Application Number Priority Date Filing Date Title
AU2004249862A AU2004249862B2 (en) 2003-06-16 2004-06-15 Airlaid method with an improved through-put rate
MXPA05013207A MXPA05013207A (es) 2003-06-16 2004-06-15 Metodo de colocacion por aire con tasa de produccion mejorada.
EP04739911A EP1633923A2 (de) 2003-06-16 2004-06-15 Airlaidverfahren mit verbessertem durchsatz
JP2006515941A JP4792391B2 (ja) 2003-06-16 2004-06-15 改善された処理速度を有するエアレイド法
BRPI0411471-0A BRPI0411471A (pt) 2003-06-16 2004-06-15 método para produzir um não-trançado fibroso e não-trançado fibroso
US10/561,131 US20070266503A1 (en) 2003-06-16 2004-06-15 Airlaid Method with an Improved Through-Put Rate
CA002528421A CA2528421A1 (en) 2003-06-16 2004-06-15 Airlaid method with an improved through-put rate
KR1020057024052A KR101121362B1 (ko) 2003-06-16 2005-12-15 개선된 작업률을 갖는 에어레이드 방법

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DE10327026.4 2003-06-16
DE10327026A DE10327026B4 (de) 2003-06-16 2003-06-16 Airlaidverfahren mit verbessertem Durchsatz, Faservlies, Verwendung einer Viskosekurzfaser und Absorbierender Gegenstand

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AU (1) AU2004249862B2 (ko)
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JP2007526950A (ja) 2007-09-20
KR101121362B1 (ko) 2012-03-09
JP4792391B2 (ja) 2011-10-12
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AU2004249862B2 (en) 2010-08-19
AR044784A1 (es) 2005-10-05
KR20060025553A (ko) 2006-03-21
BRPI0411471A (pt) 2006-07-11
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WO2004113608A3 (de) 2005-04-21
US20070266503A1 (en) 2007-11-22

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