Method and device for the production of cellulose fibres and cellulose filament yarns

Method for the production of cellulose fibers or —filaments from cellulose according to the dry-wet-extrusion method with aqueous amine oxides, especially N-methyl morpholine-N-oxide as solvent, where

• a) Cellulose or a cellulose mixture is dispersed in aqueous amine oxide with a Cuoxam-DP in the range of 250 to 3000,
• b) the dispersion obtained in this way is converted at an increased temperature under dehydration and shearing into a homogenous solution with a zero shear viscosity in the range of 600 to 6000 Pa·s and with a relaxation time in the range of 0.3 to 50 s, at 85° C. respectively,
• c) the solution is supplied to at least one spinning nozzle and first guided through a impaction chamber that is shared by one and/or the nozzle(s), where the dwelling time [of the solution] is at least equal to its relaxation time at the spinning temperature,
• d) the solution is formed in each spinning nozzle into at least one capillary and the capillary/capillaries of each nozzle are guided under draught through a non-precipitating medium and then through a spinning bath under precipitation of the cellulose threads, and
• e) the cellulose threads are separated from the precipitation flows by deflection at the end of the spinning bath drawing frame and the threads are drawn off,
• characterized in that in step d), the capillary assemblage(s) are impacted with a gas shortly before they enter the spinning bath, whereby the gas flow and the spinning bath have parallel flow components at the boundary to the gas gap.

Device for the production of cellulose fibers or —filaments from cellulose according to the dry-wet-extrusion method with aqueous amine oxides as solvents, with

• a spinning package with a spinning nozzle plate, spinning nozzles and a shared impaction chamber arranged above the spinning nozzle plate and the spinning nozzles, with the volume of said impaction chamber meeting the equation
• V≧vL·λm
• wherein V represents the volume of the impaction chamber in cm3, vL the volume flow of the cellulose solution in cm3/s and λm the relaxation time at the frequency maximum of the relaxation spectrum of the spinning solution,
• a spinning bath in two containers connected by a spinning bath pump,
• a gap a between the spinning nozzles (6) and the surface of the spinning bath (7) in the upper one of the two containers, and
• a drawing-off godet,
• characterized in that at least one wide-slot nozzle with a nozzle slot (21) directed under an angle α to the direction of the capillary run in the range 45°<α<90° is arranged in the gap a to impact the capillaries (26) before they enter the spinning bath.