EP1716279A1 - Procede de production de non-tisses, non-tisses et utilisation associee - Google Patents

Procede de production de non-tisses, non-tisses et utilisation associee

Info

Publication number
EP1716279A1
EP1716279A1 EP05707476A EP05707476A EP1716279A1 EP 1716279 A1 EP1716279 A1 EP 1716279A1 EP 05707476 A EP05707476 A EP 05707476A EP 05707476 A EP05707476 A EP 05707476A EP 1716279 A1 EP1716279 A1 EP 1716279A1
Authority
EP
European Patent Office
Prior art keywords
nonwovens
nonwoven fabric
solution
water
cellulose
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05707476A
Other languages
German (de)
English (en)
Inventor
Peter Weigel
Hans-Peter Fink
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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 Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Publication of EP1716279A1 publication Critical patent/EP1716279A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • D01F2/24—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from cellulose derivatives
    • 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
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/02—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
    • D04H3/03—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments at random
    • 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
    • D04H3/10—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 yarns or filaments made mechanically
    • D04H3/11—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 yarns or filaments made mechanically by fluid jet
    • 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
    • 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]
    • 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]
    • Y10T442/608—Including strand or fiber material which is of specific structural definition
    • 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]
    • Y10T442/647—Including a foamed layer or component

Definitions

  • the invention relates to a process for the production of nonwovens, in which a lyotropic solution of cellulose carbamate in N-methylmorpholine-N-oxide (NMMNO) by means of extrusion through a nozzle bar containing several openings via an air gap into a coagulation bath to form a plurality of continuous threads which are spun in Connection can be swirled by inflowing with gaseous medium and / or fluid.
  • NMMNO N-methylmorpholine-N-oxide
  • the invention also relates to such nonwovens and their use.
  • Nonwovens are textile fabrics in which the cohesion of the fibers is ensured not by weaving or knitting, but by interlocking and sometimes also gluing after the fibers have been swirled. Because of the wide range of uses and the low production costs, the Nonwovens production continues to show high annual growth rates.
  • the advantages of these nonwoven materials lie in particular in the high moisture absorption, the high variability of density and thickness as well as the extensive surface anisotropy, which results in the numerous possible uses, e.g.
  • Nonwovens made from continuous filaments are preferably made from synthetic fibers such as polyester, polyacrylonitrile or polypropylene.
  • Viscose fibers are preferably used as short or staple fibers for the manufacture of nonwovens.
  • Another known process for the production of fibers and other molded articles from regenerated cellulose consists in the precipitation of a solution of cellulose carbamate (EP-A 57 105, EP-A 178 292), which is obtained by reacting cellulose with urea with thermal splitting of the urea into isocyanic acid and ammonia and reaction of the isocyanic acid with the OH groups of the cellulose is formed.
  • Cellulose carbamate is soluble in cold, dilute sodium hydroxide solution and can be regenerated back to cellulose in heated sodium hydroxide solution.
  • this object is achieved in that a lyotropic solution of cellulose carbamate in N-methylmorpholine-N-oxide (NMMNO) by means of extrusion through at least 20 openings, i.e. Nozzles containing the nozzle block through an air gap in one
  • NMMNO N-methylmorpholine-N-oxide
  • Precipitation bath is spun into a plurality of continuous filaments, which are then swirled by flowing with gaseous medium and / or fluid to form the nonwoven.
  • Cellulose carbamate is soluble in NMMNO and can be deformed in a similar way to cellulose.
  • the following advantageous differences can be seen compared to the conventional NMMNO process:
  • Cellulose carbamate has a significantly higher water absorption capacity and better dyeability than cellulose.
  • a nozzle bar with at least 10,000 openings is preferably used for the extrusion.
  • the ratio of length to diameter (L / D ratio) of the nozzles is preferably between 1 and 20.
  • the width of the air gap between the nozzle and the precipitation bath is preferably 5 to 250 mm, particularly preferably 10 to 150 mm.
  • the continuous filaments are guided downward into a slit-shaped funnel after spinning, the intermingling with the gaseous medium and / or fluid taking place at the outlet of the funnel.
  • Air and / or water are preferably used as the gaseous medium and / or fluid.
  • the continuous threads are deposited on a conveyor belt after the intermingling.
  • a further intermingling of the continuous threads is preferably realized by shaking the conveyor belt.
  • the lyotropic solution is preferred by swelling the cellulose carbamate in a 50% solution of
  • the cellulose carbamate content of the lyotropic solution is preferably at least 20% by weight, particularly preferably 22 to 27% by weight. The percentages relate to the entire lyotropic solution.
  • the precipitation bath preferably consists of a solution of NMMNO in water with an NMMNO content of 0.5 to 25% by weight, particularly preferably 5 to 15% by weight, based on the solution of NMMNO in water.
  • the extrusion or spinning is preferably carried out at a temperature of 80 to 110 ° C, particularly preferably of 85 to 95 ° C.
  • the nonwoven is subsequently attached the previously described steps are washed, pressed and dried.
  • the washing can preferably be carried out by a high pressure water jet.
  • the cellulose carbamate is regenerated to cellulose in a regeneration bath of 0.3 to 1% by weight sodium hydroxide in water at a temperature of 60 to 95 ° C. This enables nonwovens from regenerated
  • a nonwoven fabric is also provided from a random scrim made of cellulose carbamate filaments. It is preferred that the continuous filaments have a strength of at least 60 cN / tex. Furthermore, such a nonwoven fabric can preferably be produced by the method according to one of claims 1 to 19.
  • a nonwoven fabric is also made from a
  • Tangled scrim made of continuous filaments made of regenerated cellulose.
  • the fibers made from regenerated cellulose preferably have a residual nitrogen content (residual N content) of 0.3 to 0.5, particularly preferably 0.1 to 1.2.
  • the nonwoven fabric has a pore structure with a preferred porosity of 1 to 10%. It is further preferred that the nonwoven fabric has a specific inner surface between 20 and 50 m / cm 3 , measured by means of small-angle X-ray scattering (SAXS).
  • SAXS small-angle X-ray scattering
  • the nonwoven fabric according to the invention can particularly preferably be produced from regenerated cellulose by the process according to one of Claims 16 to 19.
  • the nonwovens according to the invention are preferably used in medicine, in particular as surgical drapes, bed sheets, wound coverings, gauze or cotton pads.
  • the nonwovens can also be used as hygiene materials or as wipes in the household.
  • Another field of application of the nonwovens according to the invention are decorative nonwovens, in particular tablecloths, napkins or curtains, and insert nonwovens in the clothing industry.
  • the nonwovens according to the invention are used as insulating mats or reinforcing nonwovens, e.g. as replacement for
  • Glass fiber fleece used in the construction industry. Because of the high strength, the nonwovens according to the invention can be used in a similar way to glass fiber nonwovens for reinforcing plastics.
  • Fig. 1 shows a schematic representation of the process flow according to the invention.
  • FIG. 2 shows a slot-shaped funnel according to the invention, at the exit of which the swirling takes place.
  • the basic sequence of the method is shown in FIG. 1.
  • the spinning solution 1 is extruded into a precipitation bath 4 by means of a spinning pump 2 by means of a nozzle bar 3, which contains a large number of nozzles.
  • Spinning is carried out vertically from top to bottom through the air gap into the precipitation bath.
  • the fibers are drawn off in a horizontal direction via deflection rollers 5.
  • a first wash bath and a stretching section can optionally be located on this route.
  • Another deflection roller 6 then leads the fiber bundle down into a slit-shaped funnel 7, at the exit of which the fiber bundle is flown by air or water on both sides.
  • the fibers swirled in this way are placed on the one underneath
  • Transport belt 8 deposited, with further swirling by shaking the depositing device or the conveyor belt transversely to the direction of travel.
  • the strip passes through a washing bath with a washing nozzle 9, which can also be realized by a water jet under high pressure, and thus leads to a further solidification of the material in the sense of spun lacing.
  • the conveyor belt consists of a wide-meshed network, preferably made of metal, which ensures that the washing liquid runs off quickly.
  • the material can then be dried in appropriate drying devices. However, the water can also be squeezed out by a pair of rollers, which at the same time enables the nonwoven to be compressed.
  • Figure 2 shows the structure of a slot-shaped funnel according to the invention.
  • the fiber can be introduced into said funnel via the fiber inlet 1.
  • the transport of the fiber through the funnel is made possible by a Venturi nozzle implements the water jet principle.
  • Through the opening 3 there is the supply of water, air or a mixture thereof which, due to the Venturi profile, flows past the channel 4 in such a way that a negative pressure is created which transports the fiber through the channel 4.
  • the fiber exit At the lower end 5 of the funnel is the fiber exit, from where the filaments can then be transported on.
  • 800 g of pulp with a DP ( Cu o ⁇ am) of 520 are in a kneader with 3200 g of a solution consisting of 12 wt .-% NaOH, 30 wt .-% urea and 58 wt .-% water for 1 h at 25 ° C. mixed intensively and then pre-matured at 23 ° C for 48 h on a DP (Cu o ⁇ a ⁇ ) of 300.
  • the moist alkali cellulose is kneaded at room temperature in a 5 l kneader with 1200 g of solid crystalline urea for 30 minutes. The temperature of the kneader is then raised to 140 ° C. and the water present is drawn off.
  • the cellulose carbamate was mixed in a kneader with a 50% aqueous NMMO solution, this solution by removing the excess water with a Concentrated in a vacuum of 80 mbar to the NNMO monohydrate and thereby the cellulose carbamate dissolved.
  • the spinning solution had a cellulose content of 25% by mass.
  • the solution was spun on a laboratory system with 10,000 capillaries, led to the swirling nozzle via a roller system, swirled there in a water stream and continuously deposited on a conveyor belt to form a fleece, washed and dried.
  • the basis weight of the fleece was 75.7 g / m, the dry strength 8.5 kN / m.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Artificial Filaments (AREA)
  • Nonwoven Fabrics (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

Abstract

L'invention concerne un procédé pour produire des non-tissés, selon lequel une solution lyotrope de carbamate cellulosique dans du N-méthylmorpholine-N-oxyde (NMMNO) est filée par extrusion en plusieurs fils continus qui passent par une tuyère comportant plusieurs ouvertures, une fente d'aération et un bain de précipitation, ces fils étant ensuite entrelacés par soufflage d'un agent gazeux et/ou d'un fluide. La présente invention porte également sur des non-tissés de ce type et sur leur utilisation.
EP05707476A 2004-02-17 2005-02-17 Procede de production de non-tisses, non-tisses et utilisation associee Withdrawn EP1716279A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410007617 DE102004007617B4 (de) 2004-02-17 2004-02-17 Verfahren zur Herstellung eines Vliesstoffes, Vliesstoff und dessen Verwendung
PCT/EP2005/001641 WO2005080661A1 (fr) 2004-02-17 2005-02-17 Procede de production de non-tisses, non-tisses et utilisation associee

Publications (1)

Publication Number Publication Date
EP1716279A1 true EP1716279A1 (fr) 2006-11-02

Family

ID=34877028

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05707476A Withdrawn EP1716279A1 (fr) 2004-02-17 2005-02-17 Procede de production de non-tisses, non-tisses et utilisation associee

Country Status (5)

Country Link
US (1) US20080038979A1 (fr)
EP (1) EP1716279A1 (fr)
JP (1) JP2007522360A (fr)
DE (1) DE102004007617B4 (fr)
WO (1) WO2005080661A1 (fr)

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DE102004007618A1 (de) * 2004-02-17 2005-09-22 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren zur Herstellung von Vliesstoffen, Vliesstoff und dessen Verwendung
DE102005029793B4 (de) 2005-06-27 2007-04-26 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vliesstoffe, Verfahren zu deren Herstellung sowie deren Verwendung
DE102008018743A1 (de) * 2008-04-14 2009-10-22 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Cellulosecarbamat-Spinnlösung, Cellulosecarbamatfaser sowie Verfahren zu deren Herstellung und Verwendungszwecke
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CA2814350C (fr) * 2010-10-23 2018-05-22 Pop Test LLC Dispositifs et formulations pour detecter, selectionner et controler des niveaux de certains constituants dans liquides organiques, et procede
AT511002A1 (de) * 2011-02-08 2012-08-15 Univ Innsbruck Verfahren zur verformung von cellulosecarbamat und produkte, die nach diesem verfahren hergestellt werden
TW202140884A (zh) * 2019-12-17 2021-11-01 奧地利商蘭仁股份有限公司 製造紡黏非織物的方法

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Also Published As

Publication number Publication date
JP2007522360A (ja) 2007-08-09
US20080038979A1 (en) 2008-02-14
DE102004007617B4 (de) 2007-02-08
WO2005080661A1 (fr) 2005-09-01
DE102004007617A1 (de) 2005-09-22
DE102004007617A8 (de) 2006-02-16

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