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
  • D01D5/08—Melt spinning methods
  • D01D5/088—Cooling filaments, threads or the like, leaving the spinnerettes
• • 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

Definitions

• the invention relates to a process according to the preamble of claim 1.
• “Lyocell” is the generic name BISFA (The International Bureau for the Standardization of man-made fibres) has given to cellulose fibres which are produced by dissolving cellulose in an organic solvent without formation of a derivative and extruding fibres from that solution.
• an organic solvent a mixture of an organic chemical and water is understood therein.
• Such fibres are also known by the term of “solvent-spun fibres”.
• N-methyl-morpholino-N-oxide is used today on a commercial scale.
• Lyocell fibres as well as the stability of the spinning process are substantially influenced by the conditions prevailing in the so-called air gap between the spinning nozzle and the precipitation-bath surface.
• PCT-WO 94/28218 describes a similar process as does PCT-WO 93/19230. According to that document, the temperature of the cooling air is to be kept below 50° C.
• the temperature of the cooling air may be 0° C. to 40° C.
• the temperature of the cooling air is indicated as being ⁇ 10° C. to 50° C.
• PCT-WO 98/58103 describes that in the case of a large number of extruded filaments, i.e., when spinning nozzles with a great number of spinning holes are used, a very humid climate in the air gap results. To ensure the stability of the spinning process also under those conditions, PCT-WO 98/58103 suggests that the spinning solution immediately before spinning should contain a specific proportion of cellulose and/or another polymer having a higher molecular weight.
• the temperature of the spinning solution has to be kept high also when fibres having a smaller titer, e.g. smaller than 1 dtex, are to be spun.
• the filaments in the air gap have to be stretched to a particularly high degree. Without increasing the temperature of the spinning solution, the viscosity of the spinning solution would also here be too high for this stretching.
• the temperature of the spinning solution should be 80° C. to 120° C., in particular 100° C. to 120° C. Since solutions of cellulose in NMMO are thermally unstable and tend to undergo exothermal decomposition reactions, it is, however, not desired to increase the temperature of the cellulose solution.
• the present invention has as its object to provide a process according to the generic term, whereby cellulose solutions having a high viscosity can be spun better and fibres having small titers can be produced better.
• fibres which are produced using cooling air with higher temperatures have higher strength values than fibres which at the same temperature of the spinning solution are produced using cooling air with a lower temperature.
• the cooling air has a humidity content of 4 g of H 2 O/kg of air up to 15 g of H 2 O/kg of air.
• the process according to the invention is suitable for the production of fibres having a titer of less than 1 dtex.
• a spinning solution having 15% by weight cellulose (pulp: Cellunier F, manufacturer: Rayonnier), 10% by weight water and 75% by weight NMMO was spun into fibres while using cooling air with different temperatures.
• the respective minimally obtainable titer of the fibres was measured: For this, the maximum drawing-off speed (m/min) of the fibres is determined by increasing the drawing-off speed up until the fibre breaks. This speed is noted and utilized for calculating the titer according to the calculation method described in PCT-WO 98/58103.
• the strength of the spun fibres in the conditioned state was determined, respectively. Temperature of the Strength Spinning Solution Temperature of the Minimum Titer Conditioned (° C.) Cooling Air (° C.) (dtex) (cN/tex) 100 20 2.01 38.1 100 50 1.70 38.7 100 60 1.59 40.1 100 70 1.36 39.8 100 80 1.32 40.6
• a spinning solution having 14.6% by weight cellulose (pulp: Borregaard LVU), 9.5% by weight water and 75.9% by weight NMMO was spun in a continuous experimental plant into fibres having a titer of 1.3 dtex. At different temperatures of the cooling air used it was measured which spinning-mass temperature was necessary to be able to produce without disturbances fibres having that titer. Temperature of the Cooling Air (° C.) Spinning-mass Temperature Required (° C.) 22 116 65 109
• a spinning solution having 15% by weight cellulose (pulp: Alicell VLV, manufacturer: Western Pulp), 10% by weight water and 75% by weight NMMO was spun into fibres while using cooling air with different temperatures.

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)
• Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
• Paper (AREA)

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Citations (4)

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• 2000
  • 2000-06-29 AT AT0112100A patent/AT408355B/de not_active IP Right Cessation
• 2001
  • 2001-06-28 CN CNB018118291A patent/CN1180142C/zh not_active Expired - Fee Related
  • 2001-06-28 WO PCT/AT2001/000212 patent/WO2002000975A1/fr not_active Ceased
  • 2001-06-28 AU AU6712701A patent/AU6712701A/xx active Pending
  • 2001-06-28 TW TW090115807A patent/TW534932B/zh not_active IP Right Cessation
  • 2001-06-28 EP EP01944725A patent/EP1299583B1/fr not_active Expired - Lifetime
  • 2001-06-28 JP JP2002506280A patent/JP2004501296A/ja not_active Abandoned
  • 2001-06-28 CA CA002413706A patent/CA2413706A1/fr not_active Abandoned
  • 2001-06-28 BR BR0112036-0A patent/BR0112036A/pt not_active IP Right Cessation
  • 2001-06-28 AU AU2001267127A patent/AU2001267127B2/en not_active Ceased
  • 2001-06-28 TR TR2004/01926T patent/TR200401926T4/xx unknown
  • 2001-06-28 DE DE50102613T patent/DE50102613D1/de not_active Expired - Fee Related
• 2002
  • 2002-12-23 NO NO20026186A patent/NO20026186L/no not_active Application Discontinuation
  • 2002-12-27 US US10/330,779 patent/US20030173700A1/en not_active Abandoned

Patent Citations (4)

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