| abstract |
The invention relates to a method for producing cellulosic shaped bodies, especially flat or tubular films and cellulosic membranes in the form of flat or tubular films. According to said method, a solution of cellulose in an aqueous tertiary amino oxide, said solution optionally also containing additives such as stabilisers, plasticisers, pore-forming agents and similar, is extruded using an extrusion die and the extruded shaped solution (1', 10) is guided over a gap consisting of a gaseous medium into a precipitation bath (2), then drawn off from said precipitation bath (2). The method is characterised in that the shaped solution (1', 10) or the precipitated shaped body (1'', 10) is exposed to an ultrasound treatment (9, 11) in the air gap, in the precipitation bath (2) or after the precipitation bath (2). |