Classifications

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

Definitions

• the present invention relates to a process for the production of cellulose fibers, wherein a solution of cellulose in an essentially aqueous tertiary amine oxide is extruded into filaments through spinning holes in a spinneret and the extruded filaments are passed through an air gap into a precipitation bath.
• Fibrillation is understood to mean breaking open the fiber in the longitudinal direction under mechanical stress in the wet state, as a result of which the fiber is given a hairy, furry appearance.
• a fabric made and dyed from these fibers loses its color intensity over the course of a few washes.
• the cause of the fibrillation is assumed to be that the fiber consists of fibrils arranged in the direction of the fibers, between which there is only a small amount of cross-connection.
• WO 92/14871 describes a method for producing a fiber with a reduced tendency to fibrillation. This is achieved in that all baths with which the fiber comes into contact before the first drying have a pH of maximum 8.5.
• WO 92/07124 also describes a method for producing a fiber with a reduced tendency to fibrillation, according to which the undried fiber is treated with a cationic polymer.
• a polymer with imidazole and azetidine groups is mentioned as such a polymer.
• treatment with an emulsifiable polymer e.g. Polyethylene or polyvinyl acetate, or crosslinking with glyoxal.
• the present invention therefore has the object of providing a cellulose fiber of the Genus Lyocell which has a further reduced tendency to fibrillation.
• air gap means the gas space which extends between the spinneret and the precipitation bath.
• the gas in this gas space does not necessarily have to be air, but rather can be any gas or gas mixture which does not impair the spinning process.
• air gap thus includes any such gas or gas mixture in addition to air.
• the extruded filaments are blown in the air gap with a gas stream which contains the aliphatic alcohol in gaseous form.
• a gas stream which contains the aliphatic alcohol in gaseous form.
• the production of an alcohol-containing gas stream is known to the person skilled in the art and can e.g. simply by spraying the alcohol into the gas stream using an ultrasonic atomizer or by passing the gas stream through the alcohol.
• a further advantageous variant of the process according to the invention is that the solution of cellulose in an aqueous tertiary amine oxide is extruded into filaments through ring-shaped spinning holes of a spinneret, so that a ring-shaped filament curtain is passed through the air gap, and that the gas stream is in the center of the Filament curtain formed ring supplied and the filament curtain is blown radially from the inside out.
• a suitable device with which an annular filament curtain can be blown in the manner described is known from WO 93/19230.
• the temperature in the air gap is selected so that on the one hand the dew point is not fallen below, i.e. that no alcohol condenses in the air gap and on the other hand that there are no difficulties in spinning due to the temperature being too high. Values between 10 and 60 ° C can be set, with temperatures between 20 and 40 ° C being preferred.
• the warping in the air gap depends on the diameter of the nozzle hole and the concentration of cellulose in the solution when the titer of the fibers is fixed. In the range of the preferred cellulose concentration, however, this could not be influenced the fibrillation obsolescence is determined as long as one is in the area of the optimal spinning temperature.
• the friction of the fibers against one another during washing processes or during finishing processes when wet was simulated by the following test: 8 fibers were placed in a 20 ml sample vial with 4 ml of water and in a laboratory shaker type RO-10 from Gerhardt for 9 hours, Bonn (FRG) shaken at level 12. The fibrillation behavior of the fibers was then assessed under the microscope by counting the number of fibrils per 0.276 mm fiber length.
• a 12% spinning solution of sulfite and sulfate pulp (12% water, 76% NNMO) was spun at a temperature of 115 ° C.
• a melt index device from Davenport used in plastics processing was used as the spinning apparatus. This device consists of a heated, temperature-controlled cylinder into which the spinning mass is poured. By means of a piston, which is loaded with a weight, the spinning mass is passed through the spinneret attached to the underside of the cylinder extruded. This process is referred to as the dry / wet spinning process since the extruded filament is immersed in a spinning bath after it has passed through an air gap.
• the alcohol used In the table are the alcohol used, the alcohol concentration in the air gap (g / m 3 ), the Spinning mass throughput (g of spinning mass / hole / min), the length of the air gap (mm) and the number of fibrils per fiber length of 0.276 ⁇ m, which were obtained in the fibrillation test described above.
• a spinneret with circularly arranged spinning holes was used for Examples 9 to 14, so that a circular filament curtain was passed through the air gap.
• air comparative
• examples 10-14 gas containing methanol were fed into the center of the circle formed by the spinning holes and blown radially outward.
• a spinning device with which Examples 9 to 14 can be carried out is known from WO 93/19230 (FIG. 2), but the ring-shaped filament curtain was only blown radially from the inside to the outside. The rest of the procedure was analogous to the conditions of Examples 1-8.
• Table 3 shows characteristic fiber data for the fibers shown in Table 2.
• Table 3 Example No. Fiber strength cond. cN / tex Fiber elongation cond. % Fiber strength wet cN / tex Fiber stretch wet% 9 (V) 28.4 14.1 24.4 26.3 10th 29.9 17.7 27.2 25.7 11 28.7 17.8 26.8 28.1 12th 27.2 17.3 25.1 24.8 13 26.2 19.2 22.1 24.7 14 29.1 16.9 23.4 23.4
• the titers (dtex) of fibers 9, 10, 11, 12, 13 and 14 shown in Table 3 were 1.71, 1.56, 1.6, 1.62, 2.1 and 1.86, respectively.

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)
• Polysaccharides And Polysaccharide Derivatives (AREA)
• Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
• Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Priority Applications (1)

Applications Claiming Priority (3)

Publications (2)

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Country Status (19)

Cited By (1)

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• 1994
  • 1994-09-05 AT AT0169994A patent/AT401393B/de not_active IP Right Cessation
• 1995
  • 1995-06-05 US US08/465,320 patent/US5601771A/en not_active Expired - Fee Related
  • 1995-06-26 EP EP95922339A patent/EP0731856B1/de not_active Expired - Lifetime
  • 1995-06-26 ES ES95922339T patent/ES2092921T3/es not_active Expired - Lifetime
  • 1995-06-26 DE DE19580977T patent/DE19580977D2/de not_active Expired - Fee Related
  • 1995-06-26 FI FI961901A patent/FI961901L/fi unknown
  • 1995-06-26 AT AT95922339T patent/ATE143423T1/de not_active IP Right Cessation
  • 1995-06-26 WO PCT/AT1995/000131 patent/WO1996007777A1/de active Application Filing
  • 1995-06-26 CN CN95190848A patent/CN1039044C/zh not_active Expired - Fee Related
  • 1995-06-26 CA CA002175562A patent/CA2175562A1/en not_active Abandoned
  • 1995-06-26 GB GB9607016A patent/GB2297055B/en not_active Revoked
  • 1995-06-26 AU AU27065/95A patent/AU689268B2/en not_active Ceased
  • 1995-06-26 JP JP8509023A patent/JPH09505118A/ja active Pending
  • 1995-06-26 BR BR9506354A patent/BR9506354A/pt not_active Application Discontinuation
  • 1995-06-26 DE DE59500026T patent/DE59500026D1/de not_active Expired - Fee Related
  • 1995-07-26 TW TW084107753A patent/TW279181B/zh active
  • 1995-08-04 MY MYPI95002282A patent/MY132079A/en unknown
  • 1995-08-15 TR TR95/01001A patent/TR199501001A2/xx unknown
  • 1995-08-23 ZA ZA957069A patent/ZA957069B/xx unknown
  • 1995-09-05 DE DE29514233U patent/DE29514233U1/de not_active Expired - Lifetime
• 1996
  • 1996-05-03 NO NO961794A patent/NO961794L/no unknown
  • 1996-09-26 GR GR960402525T patent/GR3021174T3/el unknown

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