US20060083918A1 - Method and device for producing post-stretched cellulose spun threads - Google Patents

Method and device for producing post-stretched cellulose spun threads Download PDF

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Publication number
US20060083918A1
US20060083918A1 US11/240,993 US24099305A US2006083918A1 US 20060083918 A1 US20060083918 A1 US 20060083918A1 US 24099305 A US24099305 A US 24099305A US 2006083918 A1 US2006083918 A1 US 2006083918A1
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Prior art keywords
spun threads
stretching
spun
post
threads
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US11/240,993
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English (en)
Inventor
Stefan Zikeli
Klaus Weidinger
Lutz Glaser
Werner Schumann
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LL Plant Engineering AG
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ZiAG Plant Engineering GmbH
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Assigned to ZIMMER AKTIENGESELLSCHAFT reassignment ZIMMER AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WEIDINGER, KLAUS, GLASER, LUTZ, SCHUMANN, WERNER, ZIKELI, STEFAN
Publication of US20060083918A1 publication Critical patent/US20060083918A1/en
Abandoned legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
    • D02G1/12—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics using stuffer boxes
    • 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
    • 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
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/02—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D01F6/18—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polymers of unsaturated nitriles, e.g. polyacrylonitrile, polyvinylidene cyanide
    • 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
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/28—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D01F6/38—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds comprising unsaturated nitriles as the major constituent
    • 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
    • D01F9/00—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments
    • D01F9/08—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments of inorganic material
    • D01F9/12—Carbon filaments; Apparatus specially adapted for the manufacture thereof
    • D01F9/14—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments
    • D01F9/20—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments from polyaddition, polycondensation or polymerisation products
    • D01F9/21—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments from polyaddition, polycondensation or polymerisation products from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D01F9/22—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments from polyaddition, polycondensation or polymerisation products from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds from polyacrylonitriles
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
    • D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
    • D02J1/22—Stretching or tensioning, shrinking or relaxing, e.g. by use of overfeed and underfeed apparatus, or preventing stretch
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
    • D02J13/00—Heating or cooling the yarn, thread, cord, rope, or the like, not specific to any one of the processes provided for in this subclass
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber

Definitions

  • the invention relates to a method for the production of Lyocell threads from a spinning solution containing water, cellulose and tertiary amine oxide as well as the spun threads produced by this method.
  • the invention relates to a device for the manufacture of spun threads from a spinning solution containing cellulose, water and tertiary amine oxide, with a spinneret, through which the spinning solution can be extruded in operation to form spun threads, with a precipitation bath with a precipitating agent to precipitate cellulose, through which the spinning threads are passed in operation, with a first stretching means, through which the spun threads can be stretched in operation, and with a second stretching means, through which the spun threads stretched by the first stretching means can be post-stretched in operation, and with a heating device arranged in the region of the second stretching means and by which the spun threads can be heated in operation during the post-stretching.
  • the spinning solution is first extruded to spun threads, then the spun threads are stretched and passed through a precipitation bath, and thereafter the cellulose of the spun threads coagulates.
  • the method of producing spun threads goes back to the patent specifications U.S. Pat. No. 4,142,913, U.S. Pat. No. 4,144,080, U.S. Pat. No. 4,211,574, U.S. Pat. No. 4,246,221, U.S. Pat. No. 4,261,943 and U.S. Pat. No. 4,416,698.
  • the spun threads can be passed on for further processing steps.
  • the spun threads can be washed, dried and treated or impregnated with additives.
  • the spun threads can be cut for the production of staple fibres.
  • the advantage of the Lyocell method lies in the good environmental compatibility and in the excellent mechanical properties of the spun threads or fibres. Through various further developments of the method developed by McCorsley the efficiency could be significantly improved.
  • the Lyocell fibres differ with regard to their structure and their textile properties and in their manufacture from the other cellulose fibres, such as described, for example, in DE-A-100 16 307, WO-A-01/58960, DE-A-197 53 806, DE-A-197 21 609, DE-A-195 11 151 and DE-A-43 12 219.
  • the spun threads touch one another in the air gap, they stick together, which either leads to an unsatisfactory fibre quality or even to an interruption in the spinning process and to a restart of spinning.
  • McCorsley used the spun threads in the air gap via a roll with a precipitation bath solution. This arrangement is however not practical at high spinning speeds.
  • a series of further developments of the McCorsley method therefore involves measures to reduce the surface adhesion of the spun threads in the air gap and to improve the operational reliability, also known as the spinning reliability, of the production method.
  • a further problem in the production of Lyocell fibres is the design of the precipitation bath. Due to the high extrusion speed the spun threads are dipped into the precipitation bath solution at a high speed and carry along the surrounding precipitation bath solution. Consequently, a flow is generated in the precipitation bath, which churns up the surface of the precipitation bath and mechanically stresses the spun threads to the point of tearing them when dipping into the precipitation bath.
  • Lyocell fibres differ crucially from the fibres as they are described in DE-A-197 53 806, DE-A-197 21 609, DE-A-195 11 151, DE-A-100 16 307 and DE-A43 12 219.
  • EP-A-823 945 EP-A-853 146 and DE-A-100 23 391 devices are described in which, after post-stretching of the extruded spun threads and after the coagulation of the cellulose in the stretched spun threads, they are maintained free of tensile stress during the further processing.
  • EP-A-853 146 and DE-A-100 23 391 devices are described in which, after post-stretching of the extruded spun threads and after the coagulation of the cellulose in the stretched spun threads, they are maintained free of tensile stress during the further processing.
  • EP-A-494 851 One way that initially appears to go in the opposite direction is put forward only in EP-A-494 851.
  • a method is described in which the essentially stress-free extruded and coagulated cellulose is stretched. The essential point in this method is that no stretching of the freshly extruded spun threads occurs.
  • EP-A494 851 which is unusual for Lyocell processing and which has apparently also not been developed further, a retrospective shaping of the spun threads is possible.
  • the method of EP-A-494 851 is therefore similar to a plastic deformation process, whereby the starting material, the unstretched Lyocell threads, exhibits a rubbery consistency.
  • the mechanical properties of the fibres produced according to the method of EP-A-494 851 are however not commensurate with present-day requirements.
  • JP-A-03-076822 a method of producing fire-resistant fibres is described. After coagulation of the unstretched fibres, the filaments are stretched for the first time, then oil is applied and they are dried. Then the filaments are post-stretched under steam and dried again.
  • Lyocell fibres For modifying the mechanical properties, such as the loop strength, tendency to fibrillation and tensile strength of Lyocell fibres, currently essentially the repertoire is taken up, as described in the article “Struktur Struktur von Cellulosefasern aus Aminoxidtheen” (Structure formation of cellulose fibres from amine oxide solutions), Lenzinger Berichte (Lenzinger Reports) 9/94, pgs. 31-35. Accordingly, the textile-related physical properties of Lyocell fibres are set by modifying the cellulose concentration in the spinning solution (cf. WO-A-96 18760), by variation of the draw-off conditions (cf. DE-A42 19 658) and the use of additives (cf.
  • the object of the invention is therefore to improve the known methods and devices for the manufacture of Lyocell fibres such that the mechanical properties such as loop strength and the tensile strength of the Lyocell fibres can be selectively influenced by a process which is easy to control.
  • the spun threads can be stretched by the first stretching means in an air gap before entering the precipitation bath.
  • the mechanical properties—here in particular the wet modulus—compared to the conventional Lyocell fibres can be substantially improved by the post-stretching or elongation of the spun threads which have already been stretched in the air gap and then been coagulated. Due to the heat treatment during the post-stretching, according to initial tests, the wet modulus is slightly reduced and the fibre again becomes slightly more elastic.
  • Lyocell fibres produced with the method according to the invention can achieve a wet modulus of at least 250 cN/tex and a wet abrasion number per 25 fibres of at least 18.
  • wet modulus figures of at least 300 cN/tex or 350 cN/tex can be achieved.
  • the wet maximum tensile force elongation can here assume relatively low values, for example at the most 12%.
  • the heat treatment can be carried out as a drying process in a stage following a washing or impregnation process, i.e. so-called stress drying.
  • the heat treatment can take place in a steam or dry steam atmosphere.
  • the steam or dry steam can contain impregnation agents which act on the spun threads and lead to a chemical secondary treatment.
  • the heat treatment is carried out in an oven in which the stretched and coagulated spun threads are post-stretched with a specified tensile stress between two godets.
  • a hot inert gas such as hot air, or steam or dry steam can be passed through the surfaces of the galettes and the spun threads lying on them.
  • the spun threads After the post-stretching the spun threads can be crimped, since the natural crimping of the spun threads is significantly reduced due to the post-stretching.
  • treatment with dry steam at the same time as crimping is also possible.
  • spun threads can be cut for the manufacture of staple fibres.
  • FIG. 1 a schematic overview of a system for the manufacture of post-stretched Lyocell fibres
  • FIG. 2 an embodiment of a means of post-stretching in a schematic view
  • FIG. 3 a further embodiment of a means of post-stretching in a schematic view.
  • FIG. 1 the basic structure of a system 1 for the manufacture of Lyocell fibres is described based on the schematic representation of FIG. 1 .
  • the system 1 of FIG. 1 is used for the manufacture of staple fibres of Lyocell.
  • a highly viscous spinning solution containing water, cellulose and tertiary amine oxide, for example N-methyl-morpholine-N-oxide is passed through a pipe system 2 .
  • the pipe system 2 is constructed in a modular manner from fluid pipe sections 2 a of a certain length, which are joined together via standard flanges 2 b.
  • the fluid pipe sections 2 a are provided with an interior temperature stabilisation device 3 , which is fitted in the fluid pipe sections 2 at the point of the core flow of the spinning solution and through which the temperature of the spinning solution in the pipe system 2 is closed-loop controlled.
  • a temperature controlled fluid is passed via feed modules 4 arranged between two adjacent fluid pipe sections through the interior temperature stabilisation device, as indicated by the arrows 5 .
  • the feed modules 4 essentially exhibit the dimension of the standard flanges and can be fitted with such flanges for connection.
  • burst modules 6 are substituted for the feed modules 4 .
  • the burst modules 6 essentially exhibit the same design as the feed modules 4 . They are fitted with burst elements which are not shown in FIG. 1 and which burst when a certain pressure is exceeded in the pipe system 2 , permitting an outwards diversion of pressure. Bursting can in particular occur during a spontaneous exothermic reaction of the spinning solution due to over-ageing or over-heating. The spinning solution emitted outwards during the burst is caught in the collection containers 7 , from where it can be recycled or removed.
  • the spinning solution is passed to a spinning head 8 through the pipe system 2 .
  • the spinning head 8 is fitted with a spinneret 9 which comprises a large number of extrusion openings (not illustrated), normally many thousands of extrusion openings.
  • the spinning solution is extruded to spun threads 10 through the extrusion openings.
  • the arrangement of the extrusion openings in the spinneret 9 can be of circular, annular or rectangular shape; in the following reference is made only to a rectangular arrangement as an example.
  • a pressure equalisation container 11 a can be arranged in the pipe system 2 to compensate for pressure variations and volume flow variations in the spinning solution in the pipe system 2 by changing its internal volume, ensuring a constant extrusion pressure at the extrusion openings of the spinning head 8 .
  • a mechanical filter device 11 b with a back-purgable filter element can be provided in the pipe system 2 .
  • the filter element exhibits a fineness between 5 ⁇ m and 25 ⁇ m. Due to the filter device 11 b a continuous or—when using alternate operating buffer storage vessels (not illustrated)—a discontinuous filtering of the spinning solution occurs.
  • the extrusion openings border on an air gap 12 through which the freshly extruded spun threads 10 pass and in which the spun threads are stretched by tensile stress.
  • a cooling gas flow 13 produced by a blower device 14 , is directed onto the spun threads 10 .
  • the temperature, moisture and composition of the cooling gas flow 13 can be controlled to predetermined or variable specified values by a climatic device 15 .
  • the cooling gas flow 13 acts at a distance from the spinneret 9 on the spun threads 10 and exhibits a velocity component in the extrusion direction E so that the spun threads are stretched by the cooling gas flow 13 .
  • the cooling gas flow 13 is turbulent.
  • the spun threads 10 After crossing the air gap 12 , the spun threads 10 enter a precipitation bath 16 .
  • the cooling gas flow 13 is spaced sufficiently from the surface 17 of the precipitation bath, so that it does not impinge on the surface.
  • the spun threads 10 are deflected by an essentially roll-shaped deflector 18 to a bundle unit 19 outside the precipitation bath, so that they again pass through the surface 17 of the precipitation bath.
  • the deflector or diverter can be configured rigidly or fixed or it can rotate with the spun threads.
  • the bundle unit 19 is rotary driven and as the first means of stretching exerts a tensile stress, acting back up to the extrusion openings of the spinneret 9 , via the diverter 18 onto the spun threads 10 , which stretches the spun threads.
  • the diverter 18 can also be driven as a means of stretching.
  • the tensile stress can also be produced solely by the cooling gas flow 13 as the first means of stretching. This has the advantage that the tensile stress is transferred into the spun threads 10 by a frictional stress acting distributed over the surface of the spun threads.
  • the spun threads 10 are combined to a spun thread bundle 20 . Then, the spun threads 10 , still wet with the precipitation bath solution 16 and combined to a spun thread bundle 20 , are laid free of stress on a conveyor device 21 and transported on it largely free of tensile stress. During the transport of the spun threads on the conveyor device 21 the complete or almost complete coagulation of the cellulose of the spun threads takes place with as little effect from stress as possible.
  • the conveyor device 21 can, as shown in FIG. 1 , be configured as a vibroconveyor, which transports the spun thread bundle 20 , or optionally a number of spun thread bundles 20 simultaneously, by vibrations in the conveying direction F.
  • the vibrations of the conveyor device 21 are indicated by the double arrow 22 . Due to the to and fro movement 21 the bundle of spun threads 20 is placed in order on the conveyor device.
  • the vibroconveyor 22 other conveying devices such as a number of consecutively arranged godets can be used with a circumferential speed which is almost constant or which reduces in the conveying direction.
  • the spun thread bundle 20 can be washed once or many times, dried and brightened, for example by a sprinkling system 23 from which a treatment medium 24 is sprayed onto the spun thread bundle 20 .
  • the spun thread bundle 20 is taken up by a godet 25 from the conveyor device 21 and passed to a second post-stretching unit 26 through which the thoroughly coagulated spun threads 10 are post-stretched.
  • the post-stretching takes place during simultaneous heat treatment or drying in the form of stress drying, because in this way the mechanical properties of the spun threads 10 are most favourably influenced. Slightly worse properties, which however are still excellent compared to the state of the art, are obtained when the heat treatment during the post-stretching is omitted.
  • the second post-stretching means 26 can also be provided immediately after the bundling unit 19 , i.e. between the conveyor device 21 and the precipitation bath 16 , so that first the post-stretched spun threads are subjected to further treatment steps.
  • the post-stretching means 26 in the entry section of the spun thread 20 can comprise a heating device 27 which brings the spun thread bundle 20 to a certain temperature and at the same time dries the spun thread bundle 20 at least on the surface.
  • the spun threads are passed over two godets 28 , 29 , which are driven such that the spun thread bundle 20 is subjected to a predetermined post-stretching tensile stress Z N between them.
  • the spun thread bundle subjected to this tensile stress is maintained at a specified high temperature and during the post-stretching can be impregnated in particular with a hot inert gas, such as air, or by steam, for example dry steam and with swelling agents or other agents for chemical fibre treatment, as indicated by the arrows 30 .
  • the godets 28 , 29 can also be heated to support the drying effect.
  • the spun thread bundle 20 Due to the post-stretching, the spun thread bundle 20 exhibits reduced crimping compared to conventional fibres so that it is crimped via a stuffer box 31 . Then, the spun thread bundle 20 is cut by a cutting device 32 . If an endless fibre is to be produced, the crimping and/or cutting can of course be omitted.
  • crimping and cutting the crimped staple fibres can be transported in random orientation in the form of a crimped endless cable 33 on a conveyor device 34 to further process steps.
  • FIG. 2 shows schematically an embodiment of a post-stretching means 26 .
  • post-stretching in the form of stress drying occurs.
  • the post-stretching means 26 comprises two godets 28 , 29 which are driven such that the spun thread bundle 20 is tensioned or extended between them with a predetermined tensile stress Z N of at least 0.8 cN/tex, preferably at least 3.5 cN/tex.
  • the godet 29 following in the conveying direction F can be rotated at a predetermined higher speed than the godet 28 preceding in the conveying direction F, whereby a slippage, essentially determining the tensile stress Z N , can prevail between the godet 29 and the spun thread bundle 20 looped around the galette.
  • the shrinkage of the spun thread bundle 20 during drying can also be exploited for stretching it: Since the spun thread bundle shortens during the drying process, an elongation or post-stretching also then takes place if this shortening is not compensated by the rotational speed of the godets 28 , 29 . In this way post-stretching can also occur when the galettes 28 , 29 rotate with essentially the same or only slightly different speeds.
  • One or both godets 28 , 29 can be provided with a surface 30 which is at least permeable to gas and through which a hot inert gas, steam or dry steam is pressed from the interior space of the godets 28 , 29 through the spun thread bundle 20 looped around the godets 28 , 29 .
  • a roll 28 a , 29 a also permeable to steam and actively or passively rotating with the godet, can be arranged in a position opposite each godet 28 , 29 , as schematically illustrated in FIG. 3 .
  • the rolls 28 a , 29 a also exhibit permeable surfaces through which the inert gas or steam is drawn off. Large drums can also be provided instead of rolls.
  • godets 28 , 29 instead of the godets 28 , 29 also larger drums or suction drums with a perforated surface can be used through which the hot gas is drawn off.
  • Test 1 the spun thread bundle was dried without tension.
  • Test 2 the spun thread bundle was dried without tension, moistened again and dried under tension. To do this, the spun thread bundle was passed through two eyes at a distance of 50 cm and loaded at each end during drying with 19 kg.
  • Test 3 the spun thread bundle was dried without tension, moistened again and dried under tension. To do this, the spun thread bundle was passed through two eyes at a distance of 50 cm and loaded at each end during drying with 38 kg.
  • Test 4 the spun thread bundle was clamped between two clamps at a distance of 38 cm and then dried.
  • Test 5 the moist spun thread bundle was dried under tension.
  • the spun thread bundle was passed through two eyes at a distance of 50 cm and loaded at each end with a weight of 9 kg.
  • Test 6 the moist spun thread bundle was dried under tension.
  • the spun thread bundle was passed through two eyes at a distance of 50 cm and loaded at each end with a weight of 19 kg.
  • Test 7 the moist spun thread bundle was dried under tension.
  • the spun thread bundle was passed through two eyes at a distance of 50 cm and loaded at each end with a weight of 38 kg.
  • the spun thread bundle was subjected to treatment with caustic soda solution (NaOH) before the drying.
  • NaOH caustic soda solution
  • the spun thread bundle was treated with a 5% NaOH solution for 5 min. and then washed with fully deionised water.
  • the NaOH solution was neutralised with 1% formic acid and again washed with fully deionised water.
  • the spun thread bundle was then dried in the dryer at 73° C. for 30 min.
  • Test 8 the spun thread bundle was dried without tension.
  • Test 9 the spun thread bundle was dried without tension, moistened again and dried under tension. To do this, the spun thread bundle was passed through two eyes at a distance of 50 cm and loaded at each end with 19 kg.
  • Test 10 the spun thread bundle was dried without tension, moistened again and dried under tension. To do this, the spun thread bundle was passed through two eyes at a distance of 50 cm and loaded at each end with 38 kg.
  • Test 11 the spun thread bundle was clamped between two clamps at a distance of 38 cm and then dried.
  • Test 12 the moist spun thread bundle was dried under tension.
  • the spun thread bundle was passed through two eyes at a distance of 50 cm and loaded at each end with a weight of 9 kg.
  • Test 13 the moist spun thread bundle was dried under tension.
  • the spun thread bundle was passed through two eyes at a distance of 50 cm and loaded at each end with a weight of 19 kg.
  • Test 14 the moist spun thread bundle was dried under tension.
  • the spun thread bundle was passed through two eyes at a distance of 50 cm and loaded at each end with a weight of 38 kg.
  • the titre was determined according to DIN EN ISO 1973.
  • the (wet) maximum tensile force and the (wet) maximum tensile force elongation were determined according to DIN EN ISO 5079.
  • the loop maximum tensile force was determined according to DIN 53843 Part 2.
  • the wet modulus was determined on a fibre bundle which can be used according to DIN EN 1973. The procedure followed the test specification ASG N 211 from Alceru Schwarza GmbH. The tests for the determination of the wet modulus were carried out on a tensile testing machine with constant rate of elongation and low-displacement electronic force measurement. The clamping length of the fibre bundle was 10.0 mm ⁇ 0.1 mm. The denier related pretension force for a titre of over 2.4 dtex was 2.5 mN/tex ⁇ 0.5 mN/tex. With a titre up to 2.4 dtex a pretension mass of 50 mg was used.
  • the rate of strain was 2.5 mm/min with a mean wet elongation at tear of up to 10%, 5.0 mm/min with a mean wet elongation at tear of over 10 to 20% and 7.5 mm/min with a mean wet elongation at tear of over 20%.
  • the spun thread bundle to be clamped was clamped with its end opposite the pretension mass in the tensile testing machine while the pretension took effect and then the lower clamp was closed and the dip tank with the wetting agent solution was raised so that the liquid level reached as far as possible to the upper clamp without however touching it.
  • the distance between the clamps must be continuously increased at the above stated strain rate until a strain rate of 5% is obtained. At this point the movement of the lower clamp was stopped and the wet tensile force determined in mN to one decimal place.
  • the wet abrasion number was determined with a fibre wet abrasion testing device FNP from SMK refzisionsmechanik Gera GmbH.
  • the wet abrasion number is the number of revolutions of the abrasive shaft up to fracture of the fibre clamped under defined pretension in the wet abrasion test device.
  • the pretension weight for a titre between 1.2 to 1.8 dtex was 70 mg.
  • the rotational speed of the abrasive shaft was 400 rpm, the angle of contact 45°.
  • the abrasive shaft is fitted with a textile tube.
  • the maximum tensile force measured both wet and dry, is essentially unchanged compared to the fibres after Test 1, which were not post-stretched. It can be concluded from the reduced maximum tensile force elongation and the reduced loop maximum tensile force in conjunction with the wet modulus and the wet abrasion number that the post-stretched fibres are more brittle and ductile than the fibres which have not been post-stretched.
  • Test 1 1.378 42.1 11.5 33.4 12.2 11.8 244 22 Test 2 1.450 43.2 9.7 32.9 11.2 7.3 272 48 Test 3 1.379 46.2 8.7 38.8 11.7 5.5 366 42 Test 4 1.420 43.6 10.5 29.3 11.8 11.9 308 34 Test 5 1.538 42.3 10.1 32.5 11.6 9.3 260 56 Test 6 1.423 42.3 10.0 32.5 12.4 7.7 288 38 Test 7 1.434 42.2 10.8 31.7 11.7 7.5 286 31 Test 8 1.390 39.4 10.6 31.8 12.4 9.6 258 23 Test 9 1.415 41.3 9.5 30.5 10.6 4.5 308 48 Test 10 1.436 40.4 8.6 33.4 11.2 5.0 346 35 Test 11 1.441 42.3 10.4 31.0 12.9 11.9 278 47 Test 12 1.369 42.6 9.
US11/240,993 2003-04-01 2005-09-30 Method and device for producing post-stretched cellulose spun threads Abandoned US20060083918A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10314878A DE10314878A1 (de) 2003-04-01 2003-04-01 Verfahren und Vorrichtung zur Herstellung nachverstreckter Cellulose-Spinnfäden
DE10314878.7 2003-04-01
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US20060144062A1 (en) * 2002-03-22 2006-07-06 Stefan Zikeli Method and device for regulating the atmospheric conditions during a spinning process
US20060055078A1 (en) * 2002-05-24 2006-03-16 Stefan Zikeli Wetting device and spinning installation comprising a wetting device
US8317503B2 (en) 2004-05-13 2012-11-27 Lenzing Aktiengesellschaft Device for producing Lyocell fibers
US20080042309A1 (en) * 2004-05-13 2008-02-21 Zimmer Aktiengesellschaft Lyocell Method and Device Comprising a Press Water Recirculation System
US20070210481A1 (en) * 2004-05-13 2007-09-13 Zimmer Aktiengesellschaft Lyocell Method and Device Involving the Control of the Metal Ion Content
US8580167B2 (en) 2004-05-13 2013-11-12 Lenzing Aktiengesellschaft Lyocell method comprising an adjustment of the processing duration based on the degree of polymerization
US20100219547A1 (en) * 2004-05-13 2010-09-02 Lenzing Aktiengesellschaft Lyocell method comprising an adjustment of the processing duration based on the degree of polymerization
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WO2008153240A1 (en) 2007-06-11 2008-12-18 Kolon Industries, Inc. Lyocell fiber for tire cord and tire cord comprising the same
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EP1608803A1 (de) 2005-12-28
CN1774527A (zh) 2006-05-17
CN100410430C (zh) 2008-08-13
TW200422447A (en) 2004-11-01
DE502004007553D1 (de) 2008-08-21
DE10314878A1 (de) 2004-10-28
BRPI0409544B1 (pt) 2014-07-22
BRPI0409544A (pt) 2006-04-18
ATE400677T1 (de) 2008-07-15
KR100691913B1 (ko) 2007-03-09
EP1608803B1 (de) 2008-07-09
KR20050119675A (ko) 2005-12-21
WO2004088010A1 (de) 2004-10-14
ZA200507946B (en) 2009-01-28

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