Patent ID: 6887409
Filing Date: 2005-05-03
Classification: D01D,D01F

Abstract:
1. A method for the production of a cellulose fiber from cellulose according to the dry-wet-extrusion method with an aqueous amine oxide, as a solvent, comprising: a) dispensing at least one type of cellulose with a Cuoxam-DP in the range of 250 to 3000 in aqueous amine oxide to form a dipersion; b) converting the dispersion at an increased temperature under dehydration and shearing into a 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 50.5, at 85° C. respectively; c) supplying the solution to at least one spinning nozzle to form at least one capillary assemblage and guiding the at least one capillary assemblage through an impaction chamber comprising a non-precipitating medium, where the dwelling time of the solution is at least equal to its relaxation time at the spinning temperature; d) guiding the at least one capillary assemblage, under draught through the non-precipitating medium and then through a downstream spinning bath comprising a precipitating medium for precipitation of cellulose threads and wherein the at least one capillary assemblage is impacted with a gas under an angle α to the direction of the capillary run in a range of 45°<α<90° before the at least one capillary assemblage enters the downstream spinning bath; and e) separating precipitated cellulose threads from a flow of the precipitating medium by deflection at the end of the spinning bath drawing frame and the threads are drawn off.