WO2007124522A1 - Nonwoven melt-blown product - Google Patents

Nonwoven melt-blown product Download PDF

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Publication number
WO2007124522A1
WO2007124522A1 PCT/AT2007/000193 AT2007000193W WO2007124522A1 WO 2007124522 A1 WO2007124522 A1 WO 2007124522A1 AT 2007000193 W AT2007000193 W AT 2007000193W WO 2007124522 A1 WO2007124522 A1 WO 2007124522A1
Authority
WO
WIPO (PCT)
Prior art keywords
web
products
product according
filters
filaments
Prior art date
Application number
PCT/AT2007/000193
Other languages
French (fr)
Inventor
Thomas Steindl
Mirko Einzmann
Shayda Rahbaran
Josef Schmidtbauer
Bernhard Voglauer
Original Assignee
Lenzing Aktiengesellschaft
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 Lenzing Aktiengesellschaft filed Critical Lenzing Aktiengesellschaft
Priority to US12/298,084 priority Critical patent/US20090312731A1/en
Priority to EP20070718409 priority patent/EP2013385A1/en
Publication of WO2007124522A1 publication Critical patent/WO2007124522A1/en

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Classifications

    • 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
    • D04H3/16—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 bonds between thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/18—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being cellulose or derivatives thereof
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/06—Wet spinning methods
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/12—Stretch-spinning methods
    • D01D5/14—Stretch-spinning methods with flowing liquid or gaseous stretching media, e.g. solution-blowing
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
    • 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
    • D04H1/42—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
    • D04H1/425—Cellulose series
    • D04H1/4258—Regenerated cellulose series
    • 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
    • D04H3/005—Synthetic 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
    • D04H3/013—Regenerated cellulose series
    • 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
    • A61F2013/15008—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterized by the use
    • A61F2013/15016—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterized by the use for breast; pads for bras
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/02—Types of fibres, filaments or particles, self-supporting or supported materials
    • B01D2239/0216—Bicomponent or multicomponent fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/02—Types of fibres, filaments or particles, self-supporting or supported materials
    • B01D2239/0258—Types of fibres, filaments or particles, self-supporting or supported materials comprising nanoparticles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0414—Surface modifiers, e.g. comprising ion exchange groups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0442—Antimicrobial, antibacterial, antifungal additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/045—Deodorising additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/10—Filtering material manufacturing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/68—Melt-blown nonwoven fabric

Definitions

  • the present invention relates to a product selected from the group consisting of filter products, disposable absorbent products, wipe products and structural and/or reinforcement products.
  • NMMO N-methyl-morpholine-N-oxide
  • melt-blowing process Under a “melt-blowing process” one understands a process, wherein extruded threads of the cellulose solution in NMMO are picked up by a gas stream flowing in a generally parallel direction to the path of the filaments.
  • the cellulose solution which is ejected through the orifices, is formed to liquid strands or latent filaments, which are drawn (or significantly decreased in diameter and increased in length and may be split into several sub-filaments) by the gas stream.
  • the filaments are then collected, for example on a rotating drum, whereby a web is formed.
  • Lyocell melt-blowing process In the following, this process is referred to as "Lyocell melt-blowing process". Nonwoven melt-blown webs made by the Lyocell melt-blowing process will in the following be referred to as "Lyocell melt-blown webs".
  • the term "Lyocell melt-blowing process” encompasses both processes by which endless filaments are obtained (such processes also referred to in the literature as “spunbonding processes"), processes by which fibres of a discrete length are obtained and processes by which mixtures of endless filaments and fibres of discrete length are obtained.
  • Lyocell melt-blown webs are very useful in a product selected from the group consisting of filter products, disposable absorbent products, wipe products and structural and/or reinforcement products.
  • the present invention relates to a product selected from the group consisting of filter products, disposable absorbent products, wipe products and structural and/or reinforcement products.which is characterized in that it is made of or comprises a nonwoven web made by a melt-blowing process employing a cellulose solution in N-methyl- morpholine (NMMO).
  • NMMO N-methyl- morpholine
  • the Lyocell melt-blown web employed in the- filter products according to the present invention preferably exhibits one or more of the following properties:
  • the dry weight of the web according to WSP 130.1 (05) is from 30 to 500 g/m 2 , preferably 40 to 80 g/m 2
  • the tenacity of the web according to WSP 110.4 (05) is from 5 to 300 N, preferably 10 to 120 N
  • the elongation of the web according to WSP 110.4 (05) is from 5% to 300%
  • the thickness of the web is from 0.2 to 0.7 mm, preferably 0.3 to 0.7 mm
  • the density of the web is from 0.07 to 0.80 g/cm 3 , preferably from 0.07 to
  • the Lyocell melt-blown web exhibits all of said properties (i) to (v) mentioned above.
  • the Lyocell melt-blown web employed in the disposable absorbent products according to the present invention preferably exhibits one or more of the following properties:
  • the syngina value according to WSP 350.1 (05) is from 3 to 27 g/tampon, preferably from 6 to 24 g/tampon
  • the dry weight of the web according to WSP 130.1 (05) is between 120 g/m 2 and 220 g/m 2 , preferably 150 g/m 2 to 200 g/m 2
  • the dry weight of the web according to WSP 130.1 (05) is preferably from 9 to
  • the water retention value of the web according to DIN 53814 is from 1 to
  • the liquid absorbency capacity of the web according to WSP 10.1 (05) is from
  • the Lyocell. melt-blown web exhibits all of said properties (i) to (ii), or (iii) to (v), respectively, as mentioned above.
  • the Lyocell melt-blown web employed in the wipe products according to the present invention preferably exhibits one or more of the following properties:
  • the dry weight of the web is from 10 to 300 g/m 2 , preferably 40-80 g/m 2
  • the thickness of the web according to WSP 120.6 (05) is from 0.2 to 5.0 mm, preferably 0.3 to 0.7 mm
  • the tenacity of the web according to WSP 110.4 (05) is from 5 to 250 N, preferably 10 to 120 N
  • the tenacity of the web in NmVg is from 0.1 to 3.0, preferably from 0.7 to
  • the elongation of the web according to WSP 110.4 (05) is from 5 to 300%
  • the MD/ CD tenacity ratio of the web is from 1 to 12
  • the water retention of the web according to DIN 53814 is from 1 to 250%, preferably 30 to 150%
  • the liquid absorbency capacity of the web according to WSP 10.1 (05) is
  • the Lyocell melt-blown web exhibits all of said properties (i) to (viii) mentioned above.
  • the Lyocell melt-blowing process for producing the webs used in the present invention preferably comprises the steps of
  • the Lyocell melt-blowing process preferably comprises the further step of
  • the filaments are only precipitated after having been collected such as to form a web. It has been shown that this measure imparts to the webs thusly produced a more "paper-like" performance and high tenacities, as compared to the more soft and textile- like performance of products where the filaments are at least partly precipitated before after forming the web.
  • webs produced according to this embodiment may for example be used as an inlay in absorbent products, such as diapers.
  • the Lyocell melt-blowing process preferably comprises the further step of
  • webs produced according to this alternative have a more soft and textile-like performance, therefore, e.g. in the case of disposable absorbent products, rendering them suitable for products such as tampons or as a skin-contacting layer in other absorbent products.
  • the properties of the Lyocell melt-blown web can be further enhanced if the production process comprises the further step of
  • Lyocell melt-blown webs produced with the preferred Lyocell melt-blowing process comprising both the steps (e) and (f) as mentioned above are especially useful as a filter product, a disposable absorbent product, a structural and/or reinforcement product or, at least, a part of said filter, disposable absorbent, structural and/or reinforcement product product.
  • Lyocell melt-blown webs produced with the preferred Lyocell melt-blowing process comprising both the steps (e'), and (f), as mentioned above, are especially useful as a disposable absorbent product or a wipe product or, at least, a part of said disposable absorbent or wipe product.
  • the Lyocell melt-blown webs alternatively may be bonded by other means of bonding, such as chemical bonding, thermal bonding and needle-punching.
  • the Lyocell melt-blown webs may be combined with layers of other materials, such as:
  • the Lyocell melt-blown web contained in the products according to the invention essentially consists of cellulose.
  • the Lyocell melt-blown web comprises a mixture of cellulose and one or more other fiber materials.
  • WO 98/07911 proposes the use of mixtures of cellulose and other materials, such as non-cellulosic polymers, for the production of melt-blown products.
  • the Lyocell melt-blown web furthermore, may comprise a bicomponent fiber material.
  • the fiber material in the Lyocell melt-blown web may at least partly comprise a modifying substance.
  • the modifying substance may be selected from the group consisting of antibacterial products, nanoparticles, lotions, fire-retardant products, absorbency-improving additives, such as superabsorbent resins, ion-exchange resins, carbon resins such as active carbon, graphite, carbon for electrical conductivity; X-ray contrast resins, luminescent pigments, dye stuffs, and resins for improvement of the chemical and mechanical stability.
  • the modifying substance may be selected from the group consisting of antibacterial products, ion-exchanger products, active carbon, nanoparticles, lotions, fire-retardant products and dye-stuffs.
  • the modifying substance may be selected from the group consisting of antibacterial products, nanoparticles, lotions, fire-retardant products, absorbency-improving additives, such as superabsorbent resins, ion-exchange resins, carbon resins such as active carbon, graphite, carbon for electrical conductivity; X-ray contrast resins, luminescent pigments, and dye stuffs.
  • the modifying substance may be selected from the group consisting of antibacterial products, nanoparticles, lotions, fire- retardant products, absorbency-improving additives, such as superabsorbent resins, ion- exchange resins, carbon resins such as active carbon, graphite, carbon for electrical conductivity; X-ray contrast resins, luminescent pigments, dye stuffs, and resins for improvement of the chemical and mechanical stability.
  • the filter product according to the present invention preferably is a product selected from the group consisting of air filters, e.g. HVAC, HEPA and ULPA filters, flue gas filters, liquid filters, coffee filters, tea bags, coffee bags, food filters, water purification filters, blood filters, cigarette filters, cabin filters, fuel filters, oil filters, cartridge filters, vacuum filters, vacuum cleaner bags, dust filters, hydraulic filters, kitchen filters, fan filters, beer filters, milk filters, liquid coolant filters, fruit juices filters, face masks, and active carbon filters.
  • air filters e.g. HVAC, HEPA and ULPA filters
  • flue gas filters e.g. HVAC, HEPA and ULPA filters
  • flue gas filters e.g. HVAC, HEPA and ULPA filters
  • liquid filters e.g. HVAC, HEPA and ULPA filters
  • coffee filters e.g., tea bags, coffee bags
  • food filters e.g., water purification filters, blood filters, cigarette filters, cabin filters, fuel filters, oil filters, cartridge filters, vacuum filters
  • the disposable absorbent product according to the present invention preferably is a product selected from the group consisting of acquisition layers, coverstock, distribution layers, absorbent covers, sanitary napkins, panty liners, diapers, incontinence products, towels, tampons, sanitary pads, backsheets, leg cuffs, flushable products, pads, nursing pads, disposal underwear, training pants, cosmetic removal pads and washcloths.
  • the Lyocell melt-blown web may both used in digital and in application tampons.
  • 150 g/m 2 to 200 g/m 2 may be processed in a tampon directly after having been produced, i.e. without intermediate steps.
  • the density of tampons produced from the Lyocell melt-blown web may range from 0.1 to 0.8 g/cm 3 , preferably 0.3 to 0.6 g/cm 3 .
  • the wipe product according to the present invention preferably is a product selected from the group consisting of baby wipes, kitchen wipes, wet wipes, cosmetic wipes, hygiene wipes, ' cleaning wipes, glass wipes, lens cleaning wipes, polishing wipes, e.g. for cars and furniture, dust wipes, industrial wipes, intimate wipes, toilet wipes, floor wipes, glas wipes, medical wipes, such as cleansing and pre-operative wipes, dusters and mops.
  • Reinforcing materials comprising the Lyocell melt-blown web may be produced by dipping the Lyocell melt-blown web into a polymer mass, or by sucking a polymer into a web, whereby the cellulose fibers in the composite material thereby obtained act as reinforching material.
  • the Lyocell melt-blown web, or products made therefrom, may be carbonized in order to form a carbonized fibre web.
  • the structural and/or reinforcement product according to the present invention preferably is a product selected from the group consisting of geotextile products, such as capillary matting, water purification products, irrigation control products, asphalt overlay, soil stabilisation products, drainage products, e.g. drainage channel liners, sedimentation and erosion control products, pond liners, impregnation base products, ground stabilisation products, pit linings, seed blankets, weed control fabrics, greenhouse shading, root bags and biodegradable plant pots; building products, such as roofing and tile underlay, underslating, thermal and noise insulation, house wraps, facings for plaster board, pipe wraps, concrete moulding layers, foundations and ground stabilisation products, vertical drainages, shingles, roofing felts, noise abatement materials, reinforcement materials, sealing materials, mechanical damping materials, fire protection materials, reinforced concrete and reinforced polymers; automotive products, such as cabin filters, boot liners, parcel shelves, heat shields, shelf trim, moulded bonnet liners, boot floor covering, oil filters, headliners, rear parcel shelves, decorative fabrics

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Chemical & Material Sciences (AREA)
  • Biomedical Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Vascular Medicine (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Epidemiology (AREA)
  • General Chemical & Material Sciences (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

The present invention relates to a product selected from the group consisting of filter products, disposable absorbent products, wipe products and structural and/or reinforcement products characterized in that said product is made of or comprises a nonwoven web made by a melt-blowing process employing a cellulose solution in N-methyl-morpholine (NMMO).

Description

Nonwoven Melt-Blown Product
The present invention relates to a product selected from the group consisting of filter products, disposable absorbent products, wipe products and structural and/or reinforcement products.
It is known to produce nonwoven webs made by a melt-blowing process employing a cellulose solution in N-methyl-morpholine-N-oxide ("NMMO") from, inter alia, WO 98/26122, WO 99/47733, WO 98/07911, US 6, 197,230, WO 99/64649, WO 05/106085 and EP 1 358 369.
Under a "melt-blowing process" one understands a process, wherein extruded threads of the cellulose solution in NMMO are picked up by a gas stream flowing in a generally parallel direction to the path of the filaments. The cellulose solution, which is ejected through the orifices, is formed to liquid strands or latent filaments, which are drawn (or significantly decreased in diameter and increased in length and may be split into several sub-filaments) by the gas stream.
The filaments are then collected, for example on a rotating drum, whereby a web is formed.
In the following, this process is referred to as "Lyocell melt-blowing process". Nonwoven melt-blown webs made by the Lyocell melt-blowing process will in the following be referred to as "Lyocell melt-blown webs". For the purposes of the present invention, the term "Lyocell melt-blowing process" encompasses both processes by which endless filaments are obtained (such processes also referred to in the literature as "spunbonding processes"), processes by which fibres of a discrete length are obtained and processes by which mixtures of endless filaments and fibres of discrete length are obtained.
It has now been found that Lyocell melt-blown webs are very useful in a product selected from the group consisting of filter products, disposable absorbent products, wipe products and structural and/or reinforcement products.
Therefore, the present invention relates to a product selected from the group consisting of filter products, disposable absorbent products, wipe products and structural and/or reinforcement products.which is characterized in that it is made of or comprises a nonwoven web made by a melt-blowing process employing a cellulose solution in N-methyl- morpholine (NMMO). Preferred embodiments are disclosed in the dependent claims.
The Lyocell melt-blown web employed in the- filter products according to the present invention preferably exhibits one or more of the following properties:
(i) the dry weight of the web according to WSP 130.1 (05) is from 30 to 500 g/m2, preferably 40 to 80 g/m2 (ii) the tenacity of the web according to WSP 110.4 (05) is from 5 to 300 N, preferably 10 to 120 N
(iii) the elongation of the web according to WSP 110.4 (05) is from 5% to 300% (iv) the thickness of the web is from 0.2 to 0.7 mm, preferably 0.3 to 0.7 mm (v) the density of the web is from 0.07 to 0.80 g/cm3, preferably from 0.07 to
0.20 g/cm3
Most preferably, the Lyocell melt-blown web exhibits all of said properties (i) to (v) mentioned above.
The Lyocell melt-blown web employed in the disposable absorbent products according to the present invention preferably exhibits one or more of the following properties:
If used for a tampon:
(i) The syngina value according to WSP 350.1 (05) is from 3 to 27 g/tampon, preferably from 6 to 24 g/tampon (ii) The dry weight of the web according to WSP 130.1 (05) is between 120 g/m2 and 220 g/m2, preferably 150 g/m2 to 200 g/m2
If used for other absorbent products:
(iii) The dry weight of the web according to WSP 130.1 (05) is preferably from 9 to
300 g/m2, preferably 9 to 200 g/m2 (iv) The water retention value of the web according to DIN 53814 is from 1 to
300%, preferably 30 to 100% (v) The liquid absorbency capacity of the web according to WSP 10.1 (05) is from
2 to 2000%, preferably 250 to 1500%. Most preferably, the Lyocell. melt-blown web exhibits all of said properties (i) to (ii), or (iii) to (v), respectively, as mentioned above.
The Lyocell melt-blown web employed in the wipe products according to the present invention preferably exhibits one or more of the following properties:
(i) the dry weight of the web is from 10 to 300 g/m2, preferably 40-80 g/m2 (ii) the thickness of the web according to WSP 120.6 (05) is from 0.2 to 5.0 mm, preferably 0.3 to 0.7 mm (iii) the tenacity of the web according to WSP 110.4 (05) is from 5 to 250 N, preferably 10 to 120 N (iv) the tenacity of the web in NmVg is from 0.1 to 3.0, preferably from 0.7 to
2.3
(v) the elongation of the web according to WSP 110.4 (05) is from 5 to 300% (vi) the MD/ CD tenacity ratio of the web is from 1 to 12 (vii) The water retention of the web according to DIN 53814 is from 1 to 250%, preferably 30 to 150% (viii) The liquid absorbency capacity of the web according to WSP 10.1 (05) is
90 to 2000%, preferably 400 to 1000%.
Most preferably, the Lyocell melt-blown web exhibits all of said properties (i) to (viii) mentioned above.
The Lyocell melt-blowing process for producing the webs used in the present invention preferably comprises the steps of
(a) extruding a solution comprising cellulose dissolved in NMMO through a spinneret into an air gap, thereby forming filaments
(b) drawing said filaments by means of a gaseous stream
(c) collecting and precipitating said filaments in order to form a web
(d) converting said web into a filter product.
These steps are generally known as such from the documents mentioned above, to which reference is made in this regard. The skilled artisan is well aware of the various possibilities to carry out this process in order to achieve useful Lyocell melt-blown webs. Especially in the case of filter products, disposable absorbent products and structural and/or reinforcement products according to the invention, the Lyocell melt-blowing process preferably comprises the further step of
(e) precipitating said filaments only after having been formed into a web.
By way of this step (e), the filaments are only precipitated after having been collected such as to form a web. It has been shown that this measure imparts to the webs thusly produced a more "paper-like" performance and high tenacities, as compared to the more soft and textile- like performance of products where the filaments are at least partly precipitated before after forming the web.
In the case of disposable absorbent products, webs produced according to this embodiment may for example be used as an inlay in absorbent products, such as diapers.
In another alternative, and especially in the case of disposable absorbent products and wipe products according to the invention, the Lyocell melt-blowing process preferably comprises the further step of
(e') contacting said filaments with a vapour mist before collecting said filaments, thereby at least partly precipitating said filaments.
As mentioned above, webs produced according to this alternative have a more soft and textile-like performance, therefore, e.g. in the case of disposable absorbent products, rendering them suitable for products such as tampons or as a skin-contacting layer in other absorbent products.
The properties of the Lyocell melt-blown web can be further enhanced if the production process comprises the further step of
(f) bonding said web by means of a hydroentanglement process before converting said web into said filter product.
It has been found that it is well possible to bond a Lyocell melt-blown web by way of a hydroentanglement process. Lyocell melt-blown webs produced with the preferred Lyocell melt-blowing process comprising both the steps (e) and (f) as mentioned above are especially useful as a filter product, a disposable absorbent product, a structural and/or reinforcement product or, at least, a part of said filter, disposable absorbent, structural and/or reinforcement product product.
Lyocell melt-blown webs produced with the preferred Lyocell melt-blowing process comprising both the steps (e'), and (f), as mentioned above, are especially useful as a disposable absorbent product or a wipe product or, at least, a part of said disposable absorbent or wipe product.
The Lyocell melt-blown webs, alternatively may be bonded by other means of bonding, such as chemical bonding, thermal bonding and needle-punching.
In order to be processed to a filter product, the Lyocell melt-blown webs may be combined with layers of other materials, such as:
In the case of filter products: Layers of synthetic polymers, cellulosic fluff pulp, nonwoven webs of cellulose or synthetic polymer fibers, bicomponent fibres, webs of cellulose pulp, such as airlaid pulp, webs or fabrics of high tenacity fibres, hydrophobic materials, high performance fibres (such as temperature resistant materials or flame retardant materials, layers imparting changed mechanical properties to the final products (such as Polypropylene or Polyester layers), biodegradable materials (e.g. films, fibres or webs from Polylactic acid), and/or high bulk materials (such as Polyacrylnitrile).
In the case of disposable absorbent products: Layers of synthetic polymers, cellulosic fluff pulp, nonwoven webs of cellulose or synthetic polymer fibers, and webs of cellulose pulp, such as airlaid pulp.
In the case of wipe products: Layers of synthetic polymers, cellulosic fluff pulp, nonwoven webs of cellulose or synthetic polymer fibers, bicomponent fibres, webs of cellulose pulp, such as airlaid pulp, webs or fabrics of high tenacity fibres, hydrophobic materials, high performance fibres (such as temperature resistant materials or flame retardant materials, layers imparting changed mechanical properties to the final products (such as Polypropylene or Polyester layers), biodegradable materials (e.g. films, fibres or webs from Polylactic acid), and/or high bulk materials (such as Polyacrylnitrile). In the case of structural and/or reinforcement products: Layers of synthetic polymers, cellulosic fluff pulp, nonwoven webs of cellulose or synthetic polymer fibers, bicomponent fibres, webs of cellulose pulp, such as airlaid pulp, webs or fabrics of high tenacity fibres, hydrophobic materials, high performance fibres (such as bullet proof materials, temperature resistant materials or flame retardant materials, layers imparting changed mechanical properties to the final products (such as Polypropylene or Polyester layers), biodegradable materials (e.g. films, fibres or webs from Polylactic acid), and/or high bulk materials (such as Polyacrylnitrile).
It is also possible to combine several layers of Lyocell melt-blown webs.
In a further preferred embodiment of the present invention, the Lyocell melt-blown web contained in the products according to the invention essentially consists of cellulose.
In an alternative embodiment, the Lyocell melt-blown web comprises a mixture of cellulose and one or more other fiber materials. WO 98/07911, for example, proposes the use of mixtures of cellulose and other materials, such as non-cellulosic polymers, for the production of melt-blown products.
The Lyocell melt-blown web, furthermore, may comprise a bicomponent fiber material.
The fiber material in the Lyocell melt-blown web may at least partly comprise a modifying substance.
In the case of filter products, the modifying substance may be selected from the group consisting of antibacterial products, nanoparticles, lotions, fire-retardant products, absorbency-improving additives, such as superabsorbent resins, ion-exchange resins, carbon resins such as active carbon, graphite, carbon for electrical conductivity; X-ray contrast resins, luminescent pigments, dye stuffs, and resins for improvement of the chemical and mechanical stability.
In the case of disposable absorbent products, the modifying substance may be selected from the group consisting of antibacterial products, ion-exchanger products, active carbon, nanoparticles, lotions, fire-retardant products and dye-stuffs.
In the case of wipe products, the modifying substance may be selected from the group consisting of antibacterial products, nanoparticles, lotions, fire-retardant products, absorbency-improving additives, such as superabsorbent resins, ion-exchange resins, carbon resins such as active carbon, graphite, carbon for electrical conductivity; X-ray contrast resins, luminescent pigments, and dye stuffs.
In the case of structural and/or reinforcement products, the modifying substance may be selected from the group consisting of antibacterial products, nanoparticles, lotions, fire- retardant products, absorbency-improving additives, such as superabsorbent resins, ion- exchange resins, carbon resins such as active carbon, graphite, carbon for electrical conductivity; X-ray contrast resins, luminescent pigments, dye stuffs, and resins for improvement of the chemical and mechanical stability.
The filter product according to the present invention preferably is a product selected from the group consisting of air filters, e.g. HVAC, HEPA and ULPA filters, flue gas filters, liquid filters, coffee filters, tea bags, coffee bags, food filters, water purification filters, blood filters, cigarette filters, cabin filters, fuel filters, oil filters, cartridge filters, vacuum filters, vacuum cleaner bags, dust filters, hydraulic filters, kitchen filters, fan filters, beer filters, milk filters, liquid coolant filters, fruit juices filters, face masks, and active carbon filters.
The disposable absorbent product according to the present invention preferably is a product selected from the group consisting of acquisition layers, coverstock, distribution layers, absorbent covers, sanitary napkins, panty liners, diapers, incontinence products, towels, tampons, sanitary pads, backsheets, leg cuffs, flushable products, pads, nursing pads, disposal underwear, training pants, cosmetic removal pads and washcloths.
As regards tampons, the Lyocell melt-blown web may both used in digital and in application tampons.
A Lyocell melt-blown web with a weight between 120 g/m2 and 220 g/m2, preferably
150 g/m2 to 200 g/m2 may be processed in a tampon directly after having been produced, i.e. without intermediate steps.
The density of tampons produced from the Lyocell melt-blown web may range from 0.1 to 0.8 g/cm3, preferably 0.3 to 0.6 g/cm3.
Furthermore, a very thin Lyocell melt-blown web with a weight of only about 8 g/m2 may be used as a wrapping material for tampons. The wipe product according to the present invention preferably is a product selected from the group consisting of baby wipes, kitchen wipes, wet wipes, cosmetic wipes, hygiene wipes,' cleaning wipes, glass wipes, lens cleaning wipes, polishing wipes, e.g. for cars and furniture, dust wipes, industrial wipes, intimate wipes, toilet wipes, floor wipes, glas wipes, medical wipes, such as cleansing and pre-operative wipes, dusters and mops.
Reinforcing materials comprising the Lyocell melt-blown web may be produced by dipping the Lyocell melt-blown web into a polymer mass, or by sucking a polymer into a web, whereby the cellulose fibers in the composite material thereby obtained act as reinforching material.
The Lyocell melt-blown web, or products made therefrom, may be carbonized in order to form a carbonized fibre web.
The structural and/or reinforcement product according to the present invention preferably is a product selected from the group consisting of geotextile products, such as capillary matting, water purification products, irrigation control products, asphalt overlay, soil stabilisation products, drainage products, e.g. drainage channel liners, sedimentation and erosion control products, pond liners, impregnation base products, ground stabilisation products, pit linings, seed blankets, weed control fabrics, greenhouse shading, root bags and biodegradable plant pots; building products, such as roofing and tile underlay, underslating, thermal and noise insulation, house wraps, facings for plaster board, pipe wraps, concrete moulding layers, foundations and ground stabilisation products, vertical drainages, shingles, roofing felts, noise abatement materials, reinforcement materials, sealing materials, mechanical damping materials, fire protection materials, reinforced concrete and reinforced polymers; automotive products, such as cabin filters, boot liners, parcel shelves, heat shields, shelf trim, moulded bonnet liners, boot floor covering, oil filters, headliners, rear parcel shelves, decorative fabrics, airbags, silencer pads, insulation materials, car covers, underpadding, car mats, tapes, backing and tufted carpets, seat covers, door trim, needled carpets, auto carpet backings, and reinforced polymers; furnishing products, such as furniture constructions, insulators to arms and backs, cushion thickings, dust covers, linings, stitch reinforcements, edge trim materials, bedding constructions, quilt backing, spring wraps, mattress pad components, mattress covers, window curtains, wall coverings, carpet backings, lampshades, mattress components, spring insulators, sealings, pillow thicking, mattress thicking and high loft webs for filling applications such as disposable duvets; industrial products, such as electronic products, floppy disc liners, cable insulation, abrasives, insulation tapes, conveyor belts, noise absorbent layers, air conditioning products, battery separators, acid systems, anti slip mattings, stain removers, food wraps, adhesive tapes, sausage casings, cheese casing, artificial leather, oil recovery booms and socks, papermaking felts, kettle descaler bags, and flame barriers; travel or leisure products, such as sleeping bags, tents, luggage, handbags, shopping bags, airline headrests, CD-protection products, pillowcases, sandwich packaging and surf boards; and school or office products, such as book covers, mailing envelopes, maps, signs and pennants, towels, flags and bank notes.

Claims

Claims:
1. A product selected from the group consisting of filter products, disposable absorbent products, wipe products and structural and/or reinforcement products, characterized in that said product is made of or comprises a nonwoven web made by a melt-blowing process employing a cellulose solution in N-methyl-morpholine (NMMO).
2. A filter product according to claim I5 characterized in that said nonwoven web exhibits one or more of the following properties:
(i) the dry weight of the web according to WSP 130.1 (05) is from 30 to 500 g/m2, preferably 40 to 80 g/m2 (ii) the tenacity of the web according to WSP 110.4 (05) is from 5 to 300 N, preferably 10 to 120 N.
(iii) the elongation of the web according to WSP 110.4 (05) is from 5 % to 300 % (iv) the thickness of the web is from 0.2 to 0.7 mm, preferably 0.3 to 0.7 mm (v) the density of the web is from 0.07 to 0.80 g/cm3, preferably from 0.07 to
0.20 g/cm3
3. A filter product according to claim 1 or 2, characterized in that said nonwoven web has been produced by a process comprising the steps of
(a) extruding a solution comprising cellulose dissolved in NMMO through a spinneret into an air gap, thereby forming filaments
(b) drawing said filaments by means of a gaseous stream
(c) collecting and precipitating said filaments in order to form a web
(d) converting said web into a filter product.
4. A filter product according to claim 3, characterized in that said process comprises the further step of
(e) precipitating said filaments only after having been formed into a web.
5. A filter product according to claim 3 or 4, characterized in that said process comprises the further step of (f) bonding said web by means of a hydroentanglement process before converting said web into said filter product.
6. A filter product according to any of the preceding claims, characterized in that said nonwoven web essentially consists of cellulose.
7. A filter product according to any of claims 1 to 5, characterized in that said nonwoven web comprises a mixture of cellulose and one or more other fiber materials.
8. A filter product according to any of claims 1 to 5, characterized in that said nonwoven web comprises a bicomponent fiber material.
9. A filter product according to any of the preceding claims, characterized in that the fiber material in the nonwoven web at least partly comprises a modifying substance.
10. A filter product according to claim 9, characterized in that said modifying substance is selected from the group consisting of antibacterial products, ion-exchanger products, nanoparticles, lotions, fire-retardant products, absorbency-improving additives, such as superabsorbent resins, ion-exchange resins, carbon resins such as active carbon, graphite, carbon for electrical conductivity; X-ray contrast resins, luminescent pigments, dye stuffs, and resins for improvement of the chemical and mechanical stability.
11. A filter product according to any of the preceding claims characterized in that it is selected from the group consisting of air filters, e.g. HVAC, HEPA and ULPA filters, flue gas filters, liquid filters, coffee filters, tea bags, coffee bags, food filters, water purification filters, blood filters, cigarette filters, cabin filters, fuel filters, oil filters, cartridge filters, vacuum filters, vacuum cleaner bags, dust filters, hydraulic filters, kitchen filters, fan filters, beer filters, milk filters, liquid coolant filters, fruit juices filters, face masks, and active carbon filters.
12. A disposable absorbent product according to claim 1, characterized in that said nonwoven web exhibits one or more of the following properties:
(A) If used for a tampon:
(i) The syngina value according to WSP 350.1 (05) is from 3 to 27 g/tampon, preferably from 6 to 24 g/tampon (ii) The dry weight of the web according to WSP 130.1 (05) is between 120 g/m2 and 220 g/m2, preferably 150 g/m2 to 200 g/m2
(B) If used for other absorbent products:
(iii) The dry weight of the web according to WSP 130.1 (05) is preferably from 9 to
300 g/m2, preferably 9 to 200 g/m2 (iv) The water retention value of the web according to DIN 53814 is from 1 to
300%, preferably 30 to 100% (v) The liquid absorbency capacity of the web according to WSP 10.1 (05) is from
2 to 2000%, preferably 250 to 1500%
13. A disposable absorbent product according to claim 1 , characterized in that said nonwoven web has been produced by a process comprising the steps of
(a) extruding a solution comprising cellulose dissolved in NMMO through a spinneret into an air gap, thereby forming filaments
(b) drawing said filaments by means of a gaseous stream
(c) collecting and precipitating said filaments in order to form a web
(d) converting said web into a disposable absorbent product.
14. A disposable absorbent product according to claim 13, characterized in that said process comprises the further step of
(e) precipitating said filaments only after having been formed into a web.
15. A disposable absorbent product according to claim 13, characterized in that said process comprises the further step of
(e5) contacting said filaments with a vapour mist before collecting said filaments, thereby at least partly precipitating said filaments.
16. A disposable absorbent product according to any of claims 13 to 15, characterized in that said process comprises the further step of
(f) bonding said web by means of a hydroentanglement process before converting said web into said disposable absorbent product.
17. A disposable absorbent product according to claim 1 or any of claims 12 to 16, characterized in that said nonwoven web essentially consists of cellulose.
18. A disposable absorbent product according to claim 1 or any of claims 12 to 16, characterized in that said nonwoven web comprises a mixture of cellulose and one or more other fiber materials.
19. A disposable absorbent product according to claim 1 or any of claims 12 to 16, characterized in that said nonwoven web comprises a bicomponent fiber material.
20. A disposable absorbent product according to claim 1 or any of claims 12 to 19, characterized in that the fiber material in the nonwoven web at least partly comprises a modifying substance.
21. A disposable absorbent product according to claim 20, characterized in that said modifying substance is selected from the group consisting of antibacterial products, ion- exchanger products, active carbon, nanoparticles, lotions, fire-retardant products and dye- stuffs.
22. A disposable absorbent product according to claim 1 or any of claims 12 to 21, characterized in that it is selected from the group consisting of acquisition layers, coverstock, distribution layers, absorbent covers, sanitary napkins, panty liners, diapers, incontinence products, towels, tampons, sanitary pads, backsheets, leg cuffs, flushable products, pads, nursing pads, disposal underwear, training pants, cosmetic removal pads and washcloths.
23. A wipe product according to claim 1, characterized in that said nonwoven web exhibits one or more of the following properties:
(i) the dry weight of the web is from 10 to 300 g/m2, preferably 40-80 g/m2 (ii) the thickness of the web according to WSP 120.6 (05) is from 0.2 to 5.0 mm, preferably 0.3 to 0.7 mm (iii) the tenacity of the web according to WSP 110.4 (05) is from 5 to 250 N, preferably 10 to 120 N
(iv) the tenacity of the web in NmVg is from 0.1 to 3.0, preferably from 0.7 to 2.3 (v) the elongation of the web according to WSP 110.4 (05) is from 5 to 300% (vi) the MD/CD tenacity ratio of the web is from 1 to 12 (vii) the water retention of the web according to DIN 53814 is from 1-200%, preferably 30 to 150% (viii) The liquid absorbency capacity of the web according to WSP 10.1 (05) is 90 to 2000%, preferably 400 to 1000%.
24. A wipe product according to claim 1 or 23, characterized in that said nonwoven web has been produced by a process comprising the steps of
(a) extruding a solution comprising cellulose dissolved in NMMO through a spinneret into an air gap, thereby forming filaments
(b) drawing said filaments by means of a gaseous stream
(c) collecting and precipitating said filaments in order to form a web
(d) converting said web into a wipe product.
25. A wipe product according to claim 24, characterized in that said process comprises the further step of
(e') contacting said filaments with a vapour mist before collecting said filaments, thereby at least partly precipitating said filaments.
26. A wipe product according to claim 24 or 25, characterized in that said process comprises the further step of
(fjbonding said web by means of a hydroentanglement process before converting said web into said wipe product.
27. A wipe product according to claim 1 or any of claims 23 to 26, characterized in that said nonwoven web essentially consists of cellulose.
28. A wipe product according to claim 1 or any of claims 23 to 26, characterized in that said nonwoven web comprises a mixture of cellulose and one or more other fiber materials.
29. A wipe product according to claim 1 or any of claims 23 to 26, characterized in that said nonwoven web comprises a bicomponent fiber material.
30. A wipe product according to claim 1 or any of claims 23 to 29, characterized in that the fiber material in the nonwoven web at least partly comprises a modifying substance.
31. A wipe product according to claim 30, characterized in that said modifying substance is selected from the group consisting of antibacterial products, nanoparticles, lotions, fire- retardant products, absorbency-improving additives, such as superabsorbent resins, ion- exchange resins, carbon resins such as active carbon, graphite, carbon for electrical conductivity; X-ray contrast resins, luminescent pigments, dye stuffs..
32. A wipe product according to claim 1 or any of claims 23 to 31, characterized in that it is selected from the group consisting of baby wipes, kitchen wipes, wet wipes, cosmetic wipes, hygiene wipes, cleaning wipes, glass wipes, lens cleaning wipes, polishing wipes, e.g. for cars and furniture, dust wipes, industrial wipes, intimate wipes, toilet wipes, floor wipes, glas wipes, medical wipes, such as cleansing and pre-operative wipes, dusters and mops.
33. A structural and/or reinforcement product according to claim 1 , characterized in that said nonwoven web has been produced by a process comprising the steps of
(a) extruding a solution comprising cellulose dissolved in NMMO through a spinneret into an air gap, thereby forming filaments
(b) drawing said filaments by means of a gaseous stream
(c) collecting and precipitating said filaments in order to form a web
(d) converting said web into a structural and/or reinforcement product.
34. A structural and/or reinforcement product according to claim 33, characterized in that said process comprises the further step of
(e) precipitating said filaments only after having been formed into a web.
35. A structural and/or reinforcement product according to claim 33 or 34, characterized in that said process comprises the further step of
(f) bonding said web by means of a hydroentanglement process before converting said web into said structural and/or reinforcement product.
36. A structural and/or reinforcement product according to claim 1 or any of claims 33 to 35, characterized in that said nonwoven web essentially consists of cellulose.
37. A structural and/or reinforcement product according to claim 1 or any of claims 33 to 35, characterized in that said nonwoven web comprises a mixture of cellulose and one or more other fiber materials.
38. A structural and/or reinforcement product according to claim 1 or any of claims 33 to
37, characterized in that said nonwoven web comprises a bicomponent fiber material.
39. A structural and/or reinforcement product according to claim 1 or any of claims 33 to
38, characterized in that the fiber material in the nonwoven web at least partly comprises a modifying substance.
40. A structural and/or reinforcement product according to claim 39, characterized in that said modifying substance is selected from the group consisting of antibacterial products, nanoparticles, lotions, fire-retardant products, absorbency-improving additives, such as superabsorbent resins, ion-exchange resins, carbon resins such as active carbon, graphite, carbon for electrical conductivity; X-ray contrast resins, luminescent pigments, dye stuffs, and resins for improvement of the chemical and mechanical stability.
41. A structural and/or reinforcement product according to claim 1 or any of claims 33 to 40, characterized in that it is selected from the group consisting of geotextile products, such as capillary matting, water purification products, irrigation control products, asphalt overlay, soil stabilisation products, drainage products, e.g. drainage channel liners, sedimentation and erosion control products, pond liners, impregnation base products, ground stabilisation products, pit linings, seed blankets, weed control fabrics, greenhouse shading, root bags and biodegradable plant pots; building products, such as roofing and tile underlay, underslating, thermal and noise insulation, house wraps, facings for plaster board, pipe wraps, concrete moulding layers, foundations and ground stabilisation products, vertical drainages, shingles, roofing felts, noise abatement materials, reinforcement materials, sealing materials, mechanical damping materials, fire protection materials, reinforced concrete and reinforced polymers; automotive products, such as cabin filters, boot liners, parcel shelves, heat shields, shelf trim, moulded bonnet liners, boot floor covering, oil filters, headliners, rear parcel shelves, decorative fabrics, airbags, silencer pads, insulation materials, car covers, underpadding, car mats, tapes, backing and tufted carpets, seat covers, door trim, needled carpets, auto carpet backings, and reinforced polymers; furnishing products, such as furniture constructions, insulators to arms and backs, cushion thickings, dust covers, linings, stitch reinforcements, edge trim materials, bedding constructions, quilt backing, spring wraps, mattress pad components, mattress covers, window curtains, wall coverings, carpet backings, lampshades, mattress components, spring insulators, sealings, pillow trucking, mattress thicking and high loft webs for filling applications such as disposable duvets; industrial products, such as electronic products, floppy disc liners, cable insulation, abrasives, insulation tapes, conveyor belts, noise absorbent layers, air conditioning products, battery separators, acid systems, anti slip mattings, stain removers, food wraps, adhesive tapes, sausage casings, cheese casing, artificial leather, oil recovery booms and socks, papermaking felts, kettle descaler bags, and flame barriers; travel or leisure products, such as sleeping bags, tents, luggage, handbags, shopping bags, airline headrests, CD-protection products, pillowcases, sandwich packaging and surfboards; and school or office products, such as book covers, mailing envelopes, maps, signs and pennants, towels, flags and bank notes.
PCT/AT2007/000193 2006-04-28 2007-04-26 Nonwoven melt-blown product WO2007124522A1 (en)

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