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

US6887409B2 · kind B2 · utility

Assignee

• Thuringishces Institut fur Textil und Kunststoff-Forschung E.V. · DE

Inventors

• Birgit Kosan · Rudolstadt, DE
• Christoph Michels · Riegelsberg, DE

Key dates

• Filing date: Mar 6, 2001
• Grant date: May 3, 2005
• Expiry date: Feb 2, 2022

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D01D5/04
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

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 Pa·s 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 thereo…