A method for the production of cellulose fibers or filaments from cell material,
by the dry-wet extrusion method with aqueous amine oxides, in particular, N-methylmorpholine-N-oxide
as solve is described comprising the following steps: a) dispersion of a cell material,
or a cell material mixture with a cuoxam DP from 250-3000, in aqueous amine oxide,
b) transformation of the obtained dispersion, by water evaporation with shear,
at elevated temperature, into a homogeneous solution with a zero shear viscosity
of 600 to 6000 Pas and a relaxation time of 0.3 to 50 seconds all at 85
C., c) feeding the solution to a spinning jet, previous to which it is passed through
flow chamber prior the jet(s), in which the retention time at the spinning temperature,
d) forming the solution into at least one capillary in each spinning jet, drawing
the capillary(ies) from each jet through anon-precipitating medium and then precipitating
the cellulose fibers on drawing through a precipitating bath and e) at the end
of the precipitating bath section drawing off the fibers by deflecting the precipitation
flow. In stage d) the capillary bundle(s) are treated with a gas flow, just before
the entry thereof into the precipitating bath, at an angle to the capillary
flow, wherein 4590.
